1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/bitmap.h>
3 #include <linux/kernel.h>
4 #include <linux/module.h>
5 #include <linux/interrupt.h>
7 #include <linux/spinlock.h>
8 #include <linux/list.h>
9 #include <linux/device.h>
10 #include <linux/err.h>
11 #include <linux/debugfs.h>
12 #include <linux/seq_file.h>
13 #include <linux/gpio.h>
14 #include <linux/idr.h>
15 #include <linux/slab.h>
16 #include <linux/acpi.h>
17 #include <linux/gpio/driver.h>
18 #include <linux/gpio/machine.h>
19 #include <linux/pinctrl/consumer.h>
20 #include <linux/cdev.h>
22 #include <linux/uaccess.h>
23 #include <linux/compat.h>
24 #include <linux/anon_inodes.h>
25 #include <linux/file.h>
26 #include <linux/kfifo.h>
27 #include <linux/poll.h>
28 #include <linux/timekeeping.h>
29 #include <uapi/linux/gpio.h>
32 #include "gpiolib-of.h"
33 #include "gpiolib-acpi.h"
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/gpio.h>
38 /* Implementation infrastructure for GPIO interfaces.
40 * The GPIO programming interface allows for inlining speed-critical
41 * get/set operations for common cases, so that access to SOC-integrated
42 * GPIOs can sometimes cost only an instruction or two per bit.
46 /* When debugging, extend minimal trust to callers and platform code.
47 * Also emit diagnostic messages that may help initial bringup, when
48 * board setup or driver bugs are most common.
50 * Otherwise, minimize overhead in what may be bitbanging codepaths.
53 #define extra_checks 1
55 #define extra_checks 0
58 /* Device and char device-related information */
59 static DEFINE_IDA(gpio_ida);
60 static dev_t gpio_devt;
61 #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */
62 static struct bus_type gpio_bus_type = {
67 * Number of GPIOs to use for the fast path in set array
69 #define FASTPATH_NGPIO CONFIG_GPIOLIB_FASTPATH_LIMIT
71 /* gpio_lock prevents conflicts during gpio_desc[] table updates.
72 * While any GPIO is requested, its gpio_chip is not removable;
73 * each GPIO's "requested" flag serves as a lock and refcount.
75 DEFINE_SPINLOCK(gpio_lock);
77 static DEFINE_MUTEX(gpio_lookup_lock);
78 static LIST_HEAD(gpio_lookup_list);
79 LIST_HEAD(gpio_devices);
81 static DEFINE_MUTEX(gpio_machine_hogs_mutex);
82 static LIST_HEAD(gpio_machine_hogs);
84 static void gpiochip_free_hogs(struct gpio_chip *chip);
85 static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
86 struct lock_class_key *lock_key,
87 struct lock_class_key *request_key);
88 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
89 static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip);
90 static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip);
92 static bool gpiolib_initialized;
94 static inline void desc_set_label(struct gpio_desc *d, const char *label)
100 * gpio_to_desc - Convert a GPIO number to its descriptor
101 * @gpio: global GPIO number
104 * The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO
105 * with the given number exists in the system.
107 struct gpio_desc *gpio_to_desc(unsigned gpio)
109 struct gpio_device *gdev;
112 spin_lock_irqsave(&gpio_lock, flags);
114 list_for_each_entry(gdev, &gpio_devices, list) {
115 if (gdev->base <= gpio &&
116 gdev->base + gdev->ngpio > gpio) {
117 spin_unlock_irqrestore(&gpio_lock, flags);
118 return &gdev->descs[gpio - gdev->base];
122 spin_unlock_irqrestore(&gpio_lock, flags);
124 if (!gpio_is_valid(gpio))
125 WARN(1, "invalid GPIO %d\n", gpio);
129 EXPORT_SYMBOL_GPL(gpio_to_desc);
132 * gpiochip_get_desc - get the GPIO descriptor corresponding to the given
133 * hardware number for this chip
135 * @hwnum: hardware number of the GPIO for this chip
138 * A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists
139 * in the given chip for the specified hardware number.
141 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
144 struct gpio_device *gdev = chip->gpiodev;
146 if (hwnum >= gdev->ngpio)
147 return ERR_PTR(-EINVAL);
149 return &gdev->descs[hwnum];
153 * desc_to_gpio - convert a GPIO descriptor to the integer namespace
154 * @desc: GPIO descriptor
156 * This should disappear in the future but is needed since we still
157 * use GPIO numbers for error messages and sysfs nodes.
160 * The global GPIO number for the GPIO specified by its descriptor.
162 int desc_to_gpio(const struct gpio_desc *desc)
164 return desc->gdev->base + (desc - &desc->gdev->descs[0]);
166 EXPORT_SYMBOL_GPL(desc_to_gpio);
170 * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
171 * @desc: descriptor to return the chip of
173 struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
175 if (!desc || !desc->gdev)
177 return desc->gdev->chip;
179 EXPORT_SYMBOL_GPL(gpiod_to_chip);
181 /* dynamic allocation of GPIOs, e.g. on a hotplugged device */
182 static int gpiochip_find_base(int ngpio)
184 struct gpio_device *gdev;
185 int base = ARCH_NR_GPIOS - ngpio;
187 list_for_each_entry_reverse(gdev, &gpio_devices, list) {
188 /* found a free space? */
189 if (gdev->base + gdev->ngpio <= base)
192 /* nope, check the space right before the chip */
193 base = gdev->base - ngpio;
196 if (gpio_is_valid(base)) {
197 pr_debug("%s: found new base at %d\n", __func__, base);
200 pr_err("%s: cannot find free range\n", __func__);
206 * gpiod_get_direction - return the current direction of a GPIO
207 * @desc: GPIO to get the direction of
209 * Returns 0 for output, 1 for input, or an error code in case of error.
211 * This function may sleep if gpiod_cansleep() is true.
213 int gpiod_get_direction(struct gpio_desc *desc)
215 struct gpio_chip *chip;
219 chip = gpiod_to_chip(desc);
220 offset = gpio_chip_hwgpio(desc);
222 if (!chip->get_direction)
225 ret = chip->get_direction(chip, offset);
227 /* GPIOF_DIR_IN, or other positive */
229 clear_bit(FLAG_IS_OUT, &desc->flags);
233 set_bit(FLAG_IS_OUT, &desc->flags);
237 EXPORT_SYMBOL_GPL(gpiod_get_direction);
240 * Add a new chip to the global chips list, keeping the list of chips sorted
241 * by range(means [base, base + ngpio - 1]) order.
243 * Return -EBUSY if the new chip overlaps with some other chip's integer
246 static int gpiodev_add_to_list(struct gpio_device *gdev)
248 struct gpio_device *prev, *next;
250 if (list_empty(&gpio_devices)) {
251 /* initial entry in list */
252 list_add_tail(&gdev->list, &gpio_devices);
256 next = list_entry(gpio_devices.next, struct gpio_device, list);
257 if (gdev->base + gdev->ngpio <= next->base) {
258 /* add before first entry */
259 list_add(&gdev->list, &gpio_devices);
263 prev = list_entry(gpio_devices.prev, struct gpio_device, list);
264 if (prev->base + prev->ngpio <= gdev->base) {
265 /* add behind last entry */
266 list_add_tail(&gdev->list, &gpio_devices);
270 list_for_each_entry_safe(prev, next, &gpio_devices, list) {
271 /* at the end of the list */
272 if (&next->list == &gpio_devices)
275 /* add between prev and next */
276 if (prev->base + prev->ngpio <= gdev->base
277 && gdev->base + gdev->ngpio <= next->base) {
278 list_add(&gdev->list, &prev->list);
283 dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n");
288 * Convert a GPIO name to its descriptor
290 static struct gpio_desc *gpio_name_to_desc(const char * const name)
292 struct gpio_device *gdev;
295 spin_lock_irqsave(&gpio_lock, flags);
297 list_for_each_entry(gdev, &gpio_devices, list) {
300 for (i = 0; i != gdev->ngpio; ++i) {
301 struct gpio_desc *desc = &gdev->descs[i];
303 if (!desc->name || !name)
306 if (!strcmp(desc->name, name)) {
307 spin_unlock_irqrestore(&gpio_lock, flags);
313 spin_unlock_irqrestore(&gpio_lock, flags);
319 * Takes the names from gc->names and checks if they are all unique. If they
320 * are, they are assigned to their gpio descriptors.
322 * Warning if one of the names is already used for a different GPIO.
324 static int gpiochip_set_desc_names(struct gpio_chip *gc)
326 struct gpio_device *gdev = gc->gpiodev;
332 /* First check all names if they are unique */
333 for (i = 0; i != gc->ngpio; ++i) {
334 struct gpio_desc *gpio;
336 gpio = gpio_name_to_desc(gc->names[i]);
339 "Detected name collision for GPIO name '%s'\n",
343 /* Then add all names to the GPIO descriptors */
344 for (i = 0; i != gc->ngpio; ++i)
345 gdev->descs[i].name = gc->names[i];
350 static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip)
354 p = bitmap_alloc(chip->ngpio, GFP_KERNEL);
358 /* Assume by default all GPIOs are valid */
359 bitmap_fill(p, chip->ngpio);
364 static int gpiochip_alloc_valid_mask(struct gpio_chip *gc)
366 if (!(of_gpio_need_valid_mask(gc) || gc->init_valid_mask))
369 gc->valid_mask = gpiochip_allocate_mask(gc);
376 static int gpiochip_init_valid_mask(struct gpio_chip *gc)
378 if (gc->init_valid_mask)
379 return gc->init_valid_mask(gc,
386 static void gpiochip_free_valid_mask(struct gpio_chip *gpiochip)
388 bitmap_free(gpiochip->valid_mask);
389 gpiochip->valid_mask = NULL;
392 bool gpiochip_line_is_valid(const struct gpio_chip *gpiochip,
395 /* No mask means all valid */
396 if (likely(!gpiochip->valid_mask))
398 return test_bit(offset, gpiochip->valid_mask);
400 EXPORT_SYMBOL_GPL(gpiochip_line_is_valid);
403 * GPIO line handle management
407 * struct linehandle_state - contains the state of a userspace handle
408 * @gdev: the GPIO device the handle pertains to
409 * @label: consumer label used to tag descriptors
410 * @descs: the GPIO descriptors held by this handle
411 * @numdescs: the number of descriptors held in the descs array
413 struct linehandle_state {
414 struct gpio_device *gdev;
416 struct gpio_desc *descs[GPIOHANDLES_MAX];
420 #define GPIOHANDLE_REQUEST_VALID_FLAGS \
421 (GPIOHANDLE_REQUEST_INPUT | \
422 GPIOHANDLE_REQUEST_OUTPUT | \
423 GPIOHANDLE_REQUEST_ACTIVE_LOW | \
424 GPIOHANDLE_REQUEST_OPEN_DRAIN | \
425 GPIOHANDLE_REQUEST_OPEN_SOURCE)
427 static long linehandle_ioctl(struct file *filep, unsigned int cmd,
430 struct linehandle_state *lh = filep->private_data;
431 void __user *ip = (void __user *)arg;
432 struct gpiohandle_data ghd;
433 DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
436 if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
437 /* NOTE: It's ok to read values of output lines. */
438 int ret = gpiod_get_array_value_complex(false,
447 memset(&ghd, 0, sizeof(ghd));
448 for (i = 0; i < lh->numdescs; i++)
449 ghd.values[i] = test_bit(i, vals);
451 if (copy_to_user(ip, &ghd, sizeof(ghd)))
455 } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) {
457 * All line descriptors were created at once with the same
458 * flags so just check if the first one is really output.
460 if (!test_bit(FLAG_IS_OUT, &lh->descs[0]->flags))
463 if (copy_from_user(&ghd, ip, sizeof(ghd)))
466 /* Clamp all values to [0,1] */
467 for (i = 0; i < lh->numdescs; i++)
468 __assign_bit(i, vals, ghd.values[i]);
470 /* Reuse the array setting function */
471 return gpiod_set_array_value_complex(false,
482 static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd,
485 return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg));
489 static int linehandle_release(struct inode *inode, struct file *filep)
491 struct linehandle_state *lh = filep->private_data;
492 struct gpio_device *gdev = lh->gdev;
495 for (i = 0; i < lh->numdescs; i++)
496 gpiod_free(lh->descs[i]);
499 put_device(&gdev->dev);
503 static const struct file_operations linehandle_fileops = {
504 .release = linehandle_release,
505 .owner = THIS_MODULE,
506 .llseek = noop_llseek,
507 .unlocked_ioctl = linehandle_ioctl,
509 .compat_ioctl = linehandle_ioctl_compat,
513 static int linehandle_create(struct gpio_device *gdev, void __user *ip)
515 struct gpiohandle_request handlereq;
516 struct linehandle_state *lh;
518 int fd, i, count = 0, ret;
521 if (copy_from_user(&handlereq, ip, sizeof(handlereq)))
523 if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX))
526 lflags = handlereq.flags;
528 /* Return an error if an unknown flag is set */
529 if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
533 * Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If
534 * the hardware actually supports enabling both at the same time the
535 * electrical result would be disastrous.
537 if ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) &&
538 (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
541 /* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
542 if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) &&
543 ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
544 (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)))
547 lh = kzalloc(sizeof(*lh), GFP_KERNEL);
551 get_device(&gdev->dev);
553 /* Make sure this is terminated */
554 handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0';
555 if (strlen(handlereq.consumer_label)) {
556 lh->label = kstrdup(handlereq.consumer_label,
564 /* Request each GPIO */
565 for (i = 0; i < handlereq.lines; i++) {
566 u32 offset = handlereq.lineoffsets[i];
567 struct gpio_desc *desc;
569 if (offset >= gdev->ngpio) {
574 desc = &gdev->descs[offset];
575 ret = gpiod_request(desc, lh->label);
581 if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
582 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
583 if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN)
584 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
585 if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)
586 set_bit(FLAG_OPEN_SOURCE, &desc->flags);
588 ret = gpiod_set_transitory(desc, false);
593 * Lines have to be requested explicitly for input
594 * or output, else the line will be treated "as is".
596 if (lflags & GPIOHANDLE_REQUEST_OUTPUT) {
597 int val = !!handlereq.default_values[i];
599 ret = gpiod_direction_output(desc, val);
602 } else if (lflags & GPIOHANDLE_REQUEST_INPUT) {
603 ret = gpiod_direction_input(desc);
607 dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
610 /* Let i point at the last handle */
612 lh->numdescs = handlereq.lines;
614 fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
620 file = anon_inode_getfile("gpio-linehandle",
623 O_RDONLY | O_CLOEXEC);
626 goto out_put_unused_fd;
630 if (copy_to_user(ip, &handlereq, sizeof(handlereq))) {
632 * fput() will trigger the release() callback, so do not go onto
633 * the regular error cleanup path here.
640 fd_install(fd, file);
642 dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n",
650 for (i = 0; i < count; i++)
651 gpiod_free(lh->descs[i]);
655 put_device(&gdev->dev);
660 * GPIO line event management
664 * struct lineevent_state - contains the state of a userspace event
665 * @gdev: the GPIO device the event pertains to
666 * @label: consumer label used to tag descriptors
667 * @desc: the GPIO descriptor held by this event
668 * @eflags: the event flags this line was requested with
669 * @irq: the interrupt that trigger in response to events on this GPIO
670 * @wait: wait queue that handles blocking reads of events
671 * @events: KFIFO for the GPIO events
672 * @read_lock: mutex lock to protect reads from colliding with adding
673 * new events to the FIFO
674 * @timestamp: cache for the timestamp storing it between hardirq
675 * and IRQ thread, used to bring the timestamp close to the actual
678 struct lineevent_state {
679 struct gpio_device *gdev;
681 struct gpio_desc *desc;
684 wait_queue_head_t wait;
685 DECLARE_KFIFO(events, struct gpioevent_data, 16);
686 struct mutex read_lock;
690 #define GPIOEVENT_REQUEST_VALID_FLAGS \
691 (GPIOEVENT_REQUEST_RISING_EDGE | \
692 GPIOEVENT_REQUEST_FALLING_EDGE)
694 static __poll_t lineevent_poll(struct file *filep,
695 struct poll_table_struct *wait)
697 struct lineevent_state *le = filep->private_data;
700 poll_wait(filep, &le->wait, wait);
702 if (!kfifo_is_empty(&le->events))
703 events = EPOLLIN | EPOLLRDNORM;
709 static ssize_t lineevent_read(struct file *filep,
714 struct lineevent_state *le = filep->private_data;
718 if (count < sizeof(struct gpioevent_data))
722 if (kfifo_is_empty(&le->events)) {
723 if (filep->f_flags & O_NONBLOCK)
726 ret = wait_event_interruptible(le->wait,
727 !kfifo_is_empty(&le->events));
732 if (mutex_lock_interruptible(&le->read_lock))
734 ret = kfifo_to_user(&le->events, buf, count, &copied);
735 mutex_unlock(&le->read_lock);
741 * If we couldn't read anything from the fifo (a different
742 * thread might have been faster) we either return -EAGAIN if
743 * the file descriptor is non-blocking, otherwise we go back to
744 * sleep and wait for more data to arrive.
746 if (copied == 0 && (filep->f_flags & O_NONBLOCK))
749 } while (copied == 0);
754 static int lineevent_release(struct inode *inode, struct file *filep)
756 struct lineevent_state *le = filep->private_data;
757 struct gpio_device *gdev = le->gdev;
759 free_irq(le->irq, le);
760 gpiod_free(le->desc);
763 put_device(&gdev->dev);
767 static long lineevent_ioctl(struct file *filep, unsigned int cmd,
770 struct lineevent_state *le = filep->private_data;
771 void __user *ip = (void __user *)arg;
772 struct gpiohandle_data ghd;
775 * We can get the value for an event line but not set it,
776 * because it is input by definition.
778 if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
781 memset(&ghd, 0, sizeof(ghd));
783 val = gpiod_get_value_cansleep(le->desc);
788 if (copy_to_user(ip, &ghd, sizeof(ghd)))
797 static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd,
800 return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg));
804 static const struct file_operations lineevent_fileops = {
805 .release = lineevent_release,
806 .read = lineevent_read,
807 .poll = lineevent_poll,
808 .owner = THIS_MODULE,
809 .llseek = noop_llseek,
810 .unlocked_ioctl = lineevent_ioctl,
812 .compat_ioctl = lineevent_ioctl_compat,
816 static irqreturn_t lineevent_irq_thread(int irq, void *p)
818 struct lineevent_state *le = p;
819 struct gpioevent_data ge;
822 /* Do not leak kernel stack to userspace */
823 memset(&ge, 0, sizeof(ge));
826 * We may be running from a nested threaded interrupt in which case
827 * we didn't get the timestamp from lineevent_irq_handler().
830 ge.timestamp = ktime_get_real_ns();
832 ge.timestamp = le->timestamp;
834 if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE
835 && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
836 int level = gpiod_get_value_cansleep(le->desc);
838 /* Emit low-to-high event */
839 ge.id = GPIOEVENT_EVENT_RISING_EDGE;
841 /* Emit high-to-low event */
842 ge.id = GPIOEVENT_EVENT_FALLING_EDGE;
843 } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) {
844 /* Emit low-to-high event */
845 ge.id = GPIOEVENT_EVENT_RISING_EDGE;
846 } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
847 /* Emit high-to-low event */
848 ge.id = GPIOEVENT_EVENT_FALLING_EDGE;
853 ret = kfifo_put(&le->events, ge);
855 wake_up_poll(&le->wait, EPOLLIN);
860 static irqreturn_t lineevent_irq_handler(int irq, void *p)
862 struct lineevent_state *le = p;
865 * Just store the timestamp in hardirq context so we get it as
866 * close in time as possible to the actual event.
868 le->timestamp = ktime_get_real_ns();
870 return IRQ_WAKE_THREAD;
873 static int lineevent_create(struct gpio_device *gdev, void __user *ip)
875 struct gpioevent_request eventreq;
876 struct lineevent_state *le;
877 struct gpio_desc *desc;
886 if (copy_from_user(&eventreq, ip, sizeof(eventreq)))
889 le = kzalloc(sizeof(*le), GFP_KERNEL);
893 get_device(&gdev->dev);
895 /* Make sure this is terminated */
896 eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0';
897 if (strlen(eventreq.consumer_label)) {
898 le->label = kstrdup(eventreq.consumer_label,
906 offset = eventreq.lineoffset;
907 lflags = eventreq.handleflags;
908 eflags = eventreq.eventflags;
910 if (offset >= gdev->ngpio) {
915 /* Return an error if a unknown flag is set */
916 if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) ||
917 (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) {
922 /* This is just wrong: we don't look for events on output lines */
923 if (lflags & GPIOHANDLE_REQUEST_OUTPUT) {
928 desc = &gdev->descs[offset];
929 ret = gpiod_request(desc, le->label);
935 if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
936 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
937 if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN)
938 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
939 if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)
940 set_bit(FLAG_OPEN_SOURCE, &desc->flags);
942 ret = gpiod_direction_input(desc);
946 le->irq = gpiod_to_irq(desc);
952 if (eflags & GPIOEVENT_REQUEST_RISING_EDGE)
953 irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
954 IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
955 if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE)
956 irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
957 IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
958 irqflags |= IRQF_ONESHOT;
960 INIT_KFIFO(le->events);
961 init_waitqueue_head(&le->wait);
962 mutex_init(&le->read_lock);
964 /* Request a thread to read the events */
965 ret = request_threaded_irq(le->irq,
966 lineevent_irq_handler,
967 lineevent_irq_thread,
974 fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
980 file = anon_inode_getfile("gpio-event",
983 O_RDONLY | O_CLOEXEC);
986 goto out_put_unused_fd;
990 if (copy_to_user(ip, &eventreq, sizeof(eventreq))) {
992 * fput() will trigger the release() callback, so do not go onto
993 * the regular error cleanup path here.
1000 fd_install(fd, file);
1007 free_irq(le->irq, le);
1009 gpiod_free(le->desc);
1014 put_device(&gdev->dev);
1019 * gpio_ioctl() - ioctl handler for the GPIO chardev
1021 static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1023 struct gpio_device *gdev = filp->private_data;
1024 struct gpio_chip *chip = gdev->chip;
1025 void __user *ip = (void __user *)arg;
1027 /* We fail any subsequent ioctl():s when the chip is gone */
1031 /* Fill in the struct and pass to userspace */
1032 if (cmd == GPIO_GET_CHIPINFO_IOCTL) {
1033 struct gpiochip_info chipinfo;
1035 memset(&chipinfo, 0, sizeof(chipinfo));
1037 strncpy(chipinfo.name, dev_name(&gdev->dev),
1038 sizeof(chipinfo.name));
1039 chipinfo.name[sizeof(chipinfo.name)-1] = '\0';
1040 strncpy(chipinfo.label, gdev->label,
1041 sizeof(chipinfo.label));
1042 chipinfo.label[sizeof(chipinfo.label)-1] = '\0';
1043 chipinfo.lines = gdev->ngpio;
1044 if (copy_to_user(ip, &chipinfo, sizeof(chipinfo)))
1047 } else if (cmd == GPIO_GET_LINEINFO_IOCTL) {
1048 struct gpioline_info lineinfo;
1049 struct gpio_desc *desc;
1051 if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
1053 if (lineinfo.line_offset >= gdev->ngpio)
1056 desc = &gdev->descs[lineinfo.line_offset];
1058 strncpy(lineinfo.name, desc->name,
1059 sizeof(lineinfo.name));
1060 lineinfo.name[sizeof(lineinfo.name)-1] = '\0';
1062 lineinfo.name[0] = '\0';
1065 strncpy(lineinfo.consumer, desc->label,
1066 sizeof(lineinfo.consumer));
1067 lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0';
1069 lineinfo.consumer[0] = '\0';
1073 * Userspace only need to know that the kernel is using
1074 * this GPIO so it can't use it.
1077 if (test_bit(FLAG_REQUESTED, &desc->flags) ||
1078 test_bit(FLAG_IS_HOGGED, &desc->flags) ||
1079 test_bit(FLAG_USED_AS_IRQ, &desc->flags) ||
1080 test_bit(FLAG_EXPORT, &desc->flags) ||
1081 test_bit(FLAG_SYSFS, &desc->flags))
1082 lineinfo.flags |= GPIOLINE_FLAG_KERNEL;
1083 if (test_bit(FLAG_IS_OUT, &desc->flags))
1084 lineinfo.flags |= GPIOLINE_FLAG_IS_OUT;
1085 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
1086 lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW;
1087 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
1088 lineinfo.flags |= (GPIOLINE_FLAG_OPEN_DRAIN |
1089 GPIOLINE_FLAG_IS_OUT);
1090 if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
1091 lineinfo.flags |= (GPIOLINE_FLAG_OPEN_SOURCE |
1092 GPIOLINE_FLAG_IS_OUT);
1094 if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
1097 } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) {
1098 return linehandle_create(gdev, ip);
1099 } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) {
1100 return lineevent_create(gdev, ip);
1105 #ifdef CONFIG_COMPAT
1106 static long gpio_ioctl_compat(struct file *filp, unsigned int cmd,
1109 return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1114 * gpio_chrdev_open() - open the chardev for ioctl operations
1115 * @inode: inode for this chardev
1116 * @filp: file struct for storing private data
1117 * Returns 0 on success
1119 static int gpio_chrdev_open(struct inode *inode, struct file *filp)
1121 struct gpio_device *gdev = container_of(inode->i_cdev,
1122 struct gpio_device, chrdev);
1124 /* Fail on open if the backing gpiochip is gone */
1127 get_device(&gdev->dev);
1128 filp->private_data = gdev;
1130 return nonseekable_open(inode, filp);
1134 * gpio_chrdev_release() - close chardev after ioctl operations
1135 * @inode: inode for this chardev
1136 * @filp: file struct for storing private data
1137 * Returns 0 on success
1139 static int gpio_chrdev_release(struct inode *inode, struct file *filp)
1141 struct gpio_device *gdev = container_of(inode->i_cdev,
1142 struct gpio_device, chrdev);
1144 put_device(&gdev->dev);
1149 static const struct file_operations gpio_fileops = {
1150 .release = gpio_chrdev_release,
1151 .open = gpio_chrdev_open,
1152 .owner = THIS_MODULE,
1153 .llseek = no_llseek,
1154 .unlocked_ioctl = gpio_ioctl,
1155 #ifdef CONFIG_COMPAT
1156 .compat_ioctl = gpio_ioctl_compat,
1160 static void gpiodevice_release(struct device *dev)
1162 struct gpio_device *gdev = dev_get_drvdata(dev);
1164 list_del(&gdev->list);
1165 ida_simple_remove(&gpio_ida, gdev->id);
1166 kfree_const(gdev->label);
1171 static int gpiochip_setup_dev(struct gpio_device *gdev)
1175 cdev_init(&gdev->chrdev, &gpio_fileops);
1176 gdev->chrdev.owner = THIS_MODULE;
1177 gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id);
1179 ret = cdev_device_add(&gdev->chrdev, &gdev->dev);
1183 chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n",
1184 MAJOR(gpio_devt), gdev->id);
1186 ret = gpiochip_sysfs_register(gdev);
1188 goto err_remove_device;
1190 /* From this point, the .release() function cleans up gpio_device */
1191 gdev->dev.release = gpiodevice_release;
1192 pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n",
1193 __func__, gdev->base, gdev->base + gdev->ngpio - 1,
1194 dev_name(&gdev->dev), gdev->chip->label ? : "generic");
1199 cdev_device_del(&gdev->chrdev, &gdev->dev);
1203 static void gpiochip_machine_hog(struct gpio_chip *chip, struct gpiod_hog *hog)
1205 struct gpio_desc *desc;
1208 desc = gpiochip_get_desc(chip, hog->chip_hwnum);
1210 pr_err("%s: unable to get GPIO desc: %ld\n",
1211 __func__, PTR_ERR(desc));
1215 if (test_bit(FLAG_IS_HOGGED, &desc->flags))
1218 rv = gpiod_hog(desc, hog->line_name, hog->lflags, hog->dflags);
1220 pr_err("%s: unable to hog GPIO line (%s:%u): %d\n",
1221 __func__, chip->label, hog->chip_hwnum, rv);
1224 static void machine_gpiochip_add(struct gpio_chip *chip)
1226 struct gpiod_hog *hog;
1228 mutex_lock(&gpio_machine_hogs_mutex);
1230 list_for_each_entry(hog, &gpio_machine_hogs, list) {
1231 if (!strcmp(chip->label, hog->chip_label))
1232 gpiochip_machine_hog(chip, hog);
1235 mutex_unlock(&gpio_machine_hogs_mutex);
1238 static void gpiochip_setup_devs(void)
1240 struct gpio_device *gdev;
1243 list_for_each_entry(gdev, &gpio_devices, list) {
1244 ret = gpiochip_setup_dev(gdev);
1246 pr_err("%s: Failed to initialize gpio device (%d)\n",
1247 dev_name(&gdev->dev), ret);
1251 int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
1252 struct lock_class_key *lock_key,
1253 struct lock_class_key *request_key)
1255 unsigned long flags;
1258 int base = chip->base;
1259 struct gpio_device *gdev;
1262 * First: allocate and populate the internal stat container, and
1263 * set up the struct device.
1265 gdev = kzalloc(sizeof(*gdev), GFP_KERNEL);
1268 gdev->dev.bus = &gpio_bus_type;
1270 chip->gpiodev = gdev;
1272 gdev->dev.parent = chip->parent;
1273 gdev->dev.of_node = chip->parent->of_node;
1276 #ifdef CONFIG_OF_GPIO
1277 /* If the gpiochip has an assigned OF node this takes precedence */
1279 gdev->dev.of_node = chip->of_node;
1281 chip->of_node = gdev->dev.of_node;
1284 gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL);
1289 dev_set_name(&gdev->dev, "gpiochip%d", gdev->id);
1290 device_initialize(&gdev->dev);
1291 dev_set_drvdata(&gdev->dev, gdev);
1292 if (chip->parent && chip->parent->driver)
1293 gdev->owner = chip->parent->driver->owner;
1294 else if (chip->owner)
1295 /* TODO: remove chip->owner */
1296 gdev->owner = chip->owner;
1298 gdev->owner = THIS_MODULE;
1300 gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL);
1306 if (chip->ngpio == 0) {
1307 chip_err(chip, "tried to insert a GPIO chip with zero lines\n");
1309 goto err_free_descs;
1312 if (chip->ngpio > FASTPATH_NGPIO)
1313 chip_warn(chip, "line cnt %u is greater than fast path cnt %u\n",
1314 chip->ngpio, FASTPATH_NGPIO);
1316 gdev->label = kstrdup_const(chip->label ?: "unknown", GFP_KERNEL);
1319 goto err_free_descs;
1322 gdev->ngpio = chip->ngpio;
1325 spin_lock_irqsave(&gpio_lock, flags);
1328 * TODO: this allocates a Linux GPIO number base in the global
1329 * GPIO numberspace for this chip. In the long run we want to
1330 * get *rid* of this numberspace and use only descriptors, but
1331 * it may be a pipe dream. It will not happen before we get rid
1332 * of the sysfs interface anyways.
1335 base = gpiochip_find_base(chip->ngpio);
1338 spin_unlock_irqrestore(&gpio_lock, flags);
1339 goto err_free_label;
1342 * TODO: it should not be necessary to reflect the assigned
1343 * base outside of the GPIO subsystem. Go over drivers and
1344 * see if anyone makes use of this, else drop this and assign
1351 ret = gpiodev_add_to_list(gdev);
1353 spin_unlock_irqrestore(&gpio_lock, flags);
1354 goto err_free_label;
1357 spin_unlock_irqrestore(&gpio_lock, flags);
1359 for (i = 0; i < chip->ngpio; i++)
1360 gdev->descs[i].gdev = gdev;
1362 #ifdef CONFIG_PINCTRL
1363 INIT_LIST_HEAD(&gdev->pin_ranges);
1366 ret = gpiochip_set_desc_names(chip);
1368 goto err_remove_from_list;
1370 ret = gpiochip_alloc_valid_mask(chip);
1372 goto err_remove_from_list;
1374 ret = of_gpiochip_add(chip);
1376 goto err_free_gpiochip_mask;
1378 ret = gpiochip_init_valid_mask(chip);
1380 goto err_remove_of_chip;
1382 for (i = 0; i < chip->ngpio; i++) {
1383 struct gpio_desc *desc = &gdev->descs[i];
1385 if (chip->get_direction && gpiochip_line_is_valid(chip, i)) {
1386 if (!chip->get_direction(chip, i))
1387 set_bit(FLAG_IS_OUT, &desc->flags);
1389 clear_bit(FLAG_IS_OUT, &desc->flags);
1391 if (!chip->direction_input)
1392 set_bit(FLAG_IS_OUT, &desc->flags);
1394 clear_bit(FLAG_IS_OUT, &desc->flags);
1398 acpi_gpiochip_add(chip);
1400 machine_gpiochip_add(chip);
1402 ret = gpiochip_irqchip_init_valid_mask(chip);
1404 goto err_remove_acpi_chip;
1406 ret = gpiochip_add_irqchip(chip, lock_key, request_key);
1408 goto err_remove_irqchip_mask;
1411 * By first adding the chardev, and then adding the device,
1412 * we get a device node entry in sysfs under
1413 * /sys/bus/gpio/devices/gpiochipN/dev that can be used for
1414 * coldplug of device nodes and other udev business.
1415 * We can do this only if gpiolib has been initialized.
1416 * Otherwise, defer until later.
1418 if (gpiolib_initialized) {
1419 ret = gpiochip_setup_dev(gdev);
1421 goto err_remove_irqchip;
1426 gpiochip_irqchip_remove(chip);
1427 err_remove_irqchip_mask:
1428 gpiochip_irqchip_free_valid_mask(chip);
1429 err_remove_acpi_chip:
1430 acpi_gpiochip_remove(chip);
1432 gpiochip_free_hogs(chip);
1433 of_gpiochip_remove(chip);
1434 err_free_gpiochip_mask:
1435 gpiochip_free_valid_mask(chip);
1436 err_remove_from_list:
1437 spin_lock_irqsave(&gpio_lock, flags);
1438 list_del(&gdev->list);
1439 spin_unlock_irqrestore(&gpio_lock, flags);
1441 kfree_const(gdev->label);
1445 ida_simple_remove(&gpio_ida, gdev->id);
1447 /* failures here can mean systems won't boot... */
1448 pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__,
1449 gdev->base, gdev->base + gdev->ngpio - 1,
1450 chip->label ? : "generic", ret);
1454 EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key);
1457 * gpiochip_get_data() - get per-subdriver data for the chip
1461 * The per-subdriver data for the chip.
1463 void *gpiochip_get_data(struct gpio_chip *chip)
1465 return chip->gpiodev->data;
1467 EXPORT_SYMBOL_GPL(gpiochip_get_data);
1470 * gpiochip_remove() - unregister a gpio_chip
1471 * @chip: the chip to unregister
1473 * A gpio_chip with any GPIOs still requested may not be removed.
1475 void gpiochip_remove(struct gpio_chip *chip)
1477 struct gpio_device *gdev = chip->gpiodev;
1478 struct gpio_desc *desc;
1479 unsigned long flags;
1481 bool requested = false;
1483 /* FIXME: should the legacy sysfs handling be moved to gpio_device? */
1484 gpiochip_sysfs_unregister(gdev);
1485 gpiochip_free_hogs(chip);
1486 /* Numb the device, cancelling all outstanding operations */
1488 gpiochip_irqchip_remove(chip);
1489 acpi_gpiochip_remove(chip);
1490 gpiochip_remove_pin_ranges(chip);
1491 of_gpiochip_remove(chip);
1492 gpiochip_free_valid_mask(chip);
1494 * We accept no more calls into the driver from this point, so
1495 * NULL the driver data pointer
1499 spin_lock_irqsave(&gpio_lock, flags);
1500 for (i = 0; i < gdev->ngpio; i++) {
1501 desc = &gdev->descs[i];
1502 if (test_bit(FLAG_REQUESTED, &desc->flags))
1505 spin_unlock_irqrestore(&gpio_lock, flags);
1508 dev_crit(&gdev->dev,
1509 "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n");
1512 * The gpiochip side puts its use of the device to rest here:
1513 * if there are no userspace clients, the chardev and device will
1514 * be removed, else it will be dangling until the last user is
1517 cdev_device_del(&gdev->chrdev, &gdev->dev);
1518 put_device(&gdev->dev);
1520 EXPORT_SYMBOL_GPL(gpiochip_remove);
1522 static void devm_gpio_chip_release(struct device *dev, void *res)
1524 struct gpio_chip *chip = *(struct gpio_chip **)res;
1526 gpiochip_remove(chip);
1530 * devm_gpiochip_add_data() - Resource manager gpiochip_add_data()
1531 * @dev: pointer to the device that gpio_chip belongs to.
1532 * @chip: the chip to register, with chip->base initialized
1533 * @data: driver-private data associated with this chip
1535 * Context: potentially before irqs will work
1537 * The gpio chip automatically be released when the device is unbound.
1540 * A negative errno if the chip can't be registered, such as because the
1541 * chip->base is invalid or already associated with a different chip.
1542 * Otherwise it returns zero as a success code.
1544 int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip,
1547 struct gpio_chip **ptr;
1550 ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr),
1555 ret = gpiochip_add_data(chip, data);
1562 devres_add(dev, ptr);
1566 EXPORT_SYMBOL_GPL(devm_gpiochip_add_data);
1569 * gpiochip_find() - iterator for locating a specific gpio_chip
1570 * @data: data to pass to match function
1571 * @match: Callback function to check gpio_chip
1573 * Similar to bus_find_device. It returns a reference to a gpio_chip as
1574 * determined by a user supplied @match callback. The callback should return
1575 * 0 if the device doesn't match and non-zero if it does. If the callback is
1576 * non-zero, this function will return to the caller and not iterate over any
1579 struct gpio_chip *gpiochip_find(void *data,
1580 int (*match)(struct gpio_chip *chip,
1583 struct gpio_device *gdev;
1584 struct gpio_chip *chip = NULL;
1585 unsigned long flags;
1587 spin_lock_irqsave(&gpio_lock, flags);
1588 list_for_each_entry(gdev, &gpio_devices, list)
1589 if (gdev->chip && match(gdev->chip, data)) {
1594 spin_unlock_irqrestore(&gpio_lock, flags);
1598 EXPORT_SYMBOL_GPL(gpiochip_find);
1600 static int gpiochip_match_name(struct gpio_chip *chip, void *data)
1602 const char *name = data;
1604 return !strcmp(chip->label, name);
1607 static struct gpio_chip *find_chip_by_name(const char *name)
1609 return gpiochip_find((void *)name, gpiochip_match_name);
1612 #ifdef CONFIG_GPIOLIB_IRQCHIP
1615 * The following is irqchip helper code for gpiochips.
1618 static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc)
1620 struct gpio_irq_chip *girq = &gc->irq;
1622 if (!girq->init_valid_mask)
1625 girq->valid_mask = gpiochip_allocate_mask(gc);
1626 if (!girq->valid_mask)
1629 girq->init_valid_mask(gc, girq->valid_mask, gc->ngpio);
1634 static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
1636 bitmap_free(gpiochip->irq.valid_mask);
1637 gpiochip->irq.valid_mask = NULL;
1640 bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip,
1641 unsigned int offset)
1643 if (!gpiochip_line_is_valid(gpiochip, offset))
1645 /* No mask means all valid */
1646 if (likely(!gpiochip->irq.valid_mask))
1648 return test_bit(offset, gpiochip->irq.valid_mask);
1650 EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid);
1653 * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip
1654 * @gc: the gpiochip to set the irqchip chain to
1655 * @parent_irq: the irq number corresponding to the parent IRQ for this
1657 * @parent_handler: the parent interrupt handler for the accumulated IRQ
1658 * coming out of the gpiochip. If the interrupt is nested rather than
1659 * cascaded, pass NULL in this handler argument
1661 static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gc,
1662 unsigned int parent_irq,
1663 irq_flow_handler_t parent_handler)
1665 struct gpio_irq_chip *girq = &gc->irq;
1666 struct device *dev = &gc->gpiodev->dev;
1668 if (!girq->domain) {
1669 chip_err(gc, "called %s before setting up irqchip\n",
1674 if (parent_handler) {
1675 if (gc->can_sleep) {
1677 "you cannot have chained interrupts on a chip that may sleep\n");
1680 girq->parents = devm_kcalloc(dev, 1,
1681 sizeof(*girq->parents),
1683 if (!girq->parents) {
1684 chip_err(gc, "out of memory allocating parent IRQ\n");
1687 girq->parents[0] = parent_irq;
1688 girq->num_parents = 1;
1690 * The parent irqchip is already using the chip_data for this
1691 * irqchip, so our callbacks simply use the handler_data.
1693 irq_set_chained_handler_and_data(parent_irq, parent_handler,
1699 * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip
1700 * @gpiochip: the gpiochip to set the irqchip chain to
1701 * @irqchip: the irqchip to chain to the gpiochip
1702 * @parent_irq: the irq number corresponding to the parent IRQ for this
1704 * @parent_handler: the parent interrupt handler for the accumulated IRQ
1705 * coming out of the gpiochip.
1707 void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
1708 struct irq_chip *irqchip,
1709 unsigned int parent_irq,
1710 irq_flow_handler_t parent_handler)
1712 if (gpiochip->irq.threaded) {
1713 chip_err(gpiochip, "tried to chain a threaded gpiochip\n");
1717 gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, parent_handler);
1719 EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip);
1722 * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip
1723 * @gpiochip: the gpiochip to set the irqchip nested handler to
1724 * @irqchip: the irqchip to nest to the gpiochip
1725 * @parent_irq: the irq number corresponding to the parent IRQ for this
1728 void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip,
1729 struct irq_chip *irqchip,
1730 unsigned int parent_irq)
1732 gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, NULL);
1734 EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip);
1736 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1739 * gpiochip_set_hierarchical_irqchip() - connects a hierarchical irqchip
1741 * @gc: the gpiochip to set the irqchip hierarchical handler to
1742 * @irqchip: the irqchip to handle this level of the hierarchy, the interrupt
1743 * will then percolate up to the parent
1745 static void gpiochip_set_hierarchical_irqchip(struct gpio_chip *gc,
1746 struct irq_chip *irqchip)
1748 /* DT will deal with mapping each IRQ as we go along */
1749 if (is_of_node(gc->irq.fwnode))
1753 * This is for legacy and boardfile "irqchip" fwnodes: allocate
1754 * irqs upfront instead of dynamically since we don't have the
1755 * dynamic type of allocation that hardware description languages
1756 * provide. Once all GPIO drivers using board files are gone from
1757 * the kernel we can delete this code, but for a transitional period
1758 * it is necessary to keep this around.
1760 if (is_fwnode_irqchip(gc->irq.fwnode)) {
1764 for (i = 0; i < gc->ngpio; i++) {
1765 struct irq_fwspec fwspec;
1766 unsigned int parent_hwirq;
1767 unsigned int parent_type;
1768 struct gpio_irq_chip *girq = &gc->irq;
1771 * We call the child to parent translation function
1772 * only to check if the child IRQ is valid or not.
1773 * Just pick the rising edge type here as that is what
1774 * we likely need to support.
1776 ret = girq->child_to_parent_hwirq(gc, i,
1777 IRQ_TYPE_EDGE_RISING,
1781 chip_err(gc, "skip set-up on hwirq %d\n",
1786 fwspec.fwnode = gc->irq.fwnode;
1787 /* This is the hwirq for the GPIO line side of things */
1788 fwspec.param[0] = girq->child_offset_to_irq(gc, i);
1789 /* Just pick something */
1790 fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
1791 fwspec.param_count = 2;
1792 ret = __irq_domain_alloc_irqs(gc->irq.domain,
1793 /* just pick something */
1802 "can not allocate irq for GPIO line %d parent hwirq %d in hierarchy domain: %d\n",
1809 chip_err(gc, "%s unknown fwnode type proceed anyway\n", __func__);
1814 static int gpiochip_hierarchy_irq_domain_translate(struct irq_domain *d,
1815 struct irq_fwspec *fwspec,
1816 unsigned long *hwirq,
1819 /* We support standard DT translation */
1820 if (is_of_node(fwspec->fwnode) && fwspec->param_count == 2) {
1821 return irq_domain_translate_twocell(d, fwspec, hwirq, type);
1824 /* This is for board files and others not using DT */
1825 if (is_fwnode_irqchip(fwspec->fwnode)) {
1828 ret = irq_domain_translate_twocell(d, fwspec, hwirq, type);
1831 WARN_ON(*type == IRQ_TYPE_NONE);
1837 static int gpiochip_hierarchy_irq_domain_alloc(struct irq_domain *d,
1839 unsigned int nr_irqs,
1842 struct gpio_chip *gc = d->host_data;
1843 irq_hw_number_t hwirq;
1844 unsigned int type = IRQ_TYPE_NONE;
1845 struct irq_fwspec *fwspec = data;
1846 struct irq_fwspec parent_fwspec;
1847 unsigned int parent_hwirq;
1848 unsigned int parent_type;
1849 struct gpio_irq_chip *girq = &gc->irq;
1853 * The nr_irqs parameter is always one except for PCI multi-MSI
1854 * so this should not happen.
1856 WARN_ON(nr_irqs != 1);
1858 ret = gc->irq.child_irq_domain_ops.translate(d, fwspec, &hwirq, &type);
1862 chip_info(gc, "allocate IRQ %d, hwirq %lu\n", irq, hwirq);
1864 ret = girq->child_to_parent_hwirq(gc, hwirq, type,
1865 &parent_hwirq, &parent_type);
1867 chip_err(gc, "can't look up hwirq %lu\n", hwirq);
1870 chip_info(gc, "found parent hwirq %u\n", parent_hwirq);
1873 * We set handle_bad_irq because the .set_type() should
1874 * always be invoked and set the right type of handler.
1876 irq_domain_set_info(d,
1886 * Create a IRQ fwspec to send up to the parent irqdomain:
1887 * specify the hwirq we address on the parent and tie it
1888 * all together up the chain.
1890 parent_fwspec.fwnode = d->parent->fwnode;
1891 /* This parent only handles asserted level IRQs */
1892 girq->populate_parent_fwspec(gc, &parent_fwspec, parent_hwirq,
1894 chip_info(gc, "alloc_irqs_parent for %d parent hwirq %d\n",
1896 ret = irq_domain_alloc_irqs_parent(d, irq, 1, &parent_fwspec);
1899 "failed to allocate parent hwirq %d for hwirq %lu\n",
1900 parent_hwirq, hwirq);
1905 static unsigned int gpiochip_child_offset_to_irq_noop(struct gpio_chip *chip,
1906 unsigned int offset)
1911 static void gpiochip_hierarchy_setup_domain_ops(struct irq_domain_ops *ops)
1913 ops->activate = gpiochip_irq_domain_activate;
1914 ops->deactivate = gpiochip_irq_domain_deactivate;
1915 ops->alloc = gpiochip_hierarchy_irq_domain_alloc;
1916 ops->free = irq_domain_free_irqs_common;
1919 * We only allow overriding the translate() function for
1920 * hierarchical chips, and this should only be done if the user
1921 * really need something other than 1:1 translation.
1923 if (!ops->translate)
1924 ops->translate = gpiochip_hierarchy_irq_domain_translate;
1927 static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc)
1929 if (!gc->irq.child_to_parent_hwirq ||
1931 chip_err(gc, "missing irqdomain vital data\n");
1935 if (!gc->irq.child_offset_to_irq)
1936 gc->irq.child_offset_to_irq = gpiochip_child_offset_to_irq_noop;
1938 if (!gc->irq.populate_parent_fwspec)
1939 gc->irq.populate_parent_fwspec =
1940 gpiochip_populate_parent_fwspec_twocell;
1942 gpiochip_hierarchy_setup_domain_ops(&gc->irq.child_irq_domain_ops);
1944 gc->irq.domain = irq_domain_create_hierarchy(
1945 gc->irq.parent_domain,
1949 &gc->irq.child_irq_domain_ops,
1952 if (!gc->irq.domain)
1955 gpiochip_set_hierarchical_irqchip(gc, gc->irq.chip);
1960 static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc)
1962 return !!gc->irq.parent_domain;
1965 void gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *chip,
1966 struct irq_fwspec *fwspec,
1967 unsigned int parent_hwirq,
1968 unsigned int parent_type)
1970 fwspec->param_count = 2;
1971 fwspec->param[0] = parent_hwirq;
1972 fwspec->param[1] = parent_type;
1974 EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_twocell);
1976 void gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *chip,
1977 struct irq_fwspec *fwspec,
1978 unsigned int parent_hwirq,
1979 unsigned int parent_type)
1981 fwspec->param_count = 4;
1982 fwspec->param[0] = 0;
1983 fwspec->param[1] = parent_hwirq;
1984 fwspec->param[2] = 0;
1985 fwspec->param[3] = parent_type;
1987 EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_fourcell);
1991 static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc)
1996 static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc)
2001 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
2004 * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip
2005 * @d: the irqdomain used by this irqchip
2006 * @irq: the global irq number used by this GPIO irqchip irq
2007 * @hwirq: the local IRQ/GPIO line offset on this gpiochip
2009 * This function will set up the mapping for a certain IRQ line on a
2010 * gpiochip by assigning the gpiochip as chip data, and using the irqchip
2011 * stored inside the gpiochip.
2013 int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
2014 irq_hw_number_t hwirq)
2016 struct gpio_chip *chip = d->host_data;
2019 if (!gpiochip_irqchip_irq_valid(chip, hwirq))
2022 irq_set_chip_data(irq, chip);
2024 * This lock class tells lockdep that GPIO irqs are in a different
2025 * category than their parents, so it won't report false recursion.
2027 irq_set_lockdep_class(irq, chip->irq.lock_key, chip->irq.request_key);
2028 irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler);
2029 /* Chips that use nested thread handlers have them marked */
2030 if (chip->irq.threaded)
2031 irq_set_nested_thread(irq, 1);
2032 irq_set_noprobe(irq);
2034 if (chip->irq.num_parents == 1)
2035 ret = irq_set_parent(irq, chip->irq.parents[0]);
2036 else if (chip->irq.map)
2037 ret = irq_set_parent(irq, chip->irq.map[hwirq]);
2043 * No set-up of the hardware will happen if IRQ_TYPE_NONE
2044 * is passed as default type.
2046 if (chip->irq.default_type != IRQ_TYPE_NONE)
2047 irq_set_irq_type(irq, chip->irq.default_type);
2051 EXPORT_SYMBOL_GPL(gpiochip_irq_map);
2053 void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
2055 struct gpio_chip *chip = d->host_data;
2057 if (chip->irq.threaded)
2058 irq_set_nested_thread(irq, 0);
2059 irq_set_chip_and_handler(irq, NULL, NULL);
2060 irq_set_chip_data(irq, NULL);
2062 EXPORT_SYMBOL_GPL(gpiochip_irq_unmap);
2064 static const struct irq_domain_ops gpiochip_domain_ops = {
2065 .map = gpiochip_irq_map,
2066 .unmap = gpiochip_irq_unmap,
2067 /* Virtually all GPIO irqchips are twocell:ed */
2068 .xlate = irq_domain_xlate_twocell,
2072 * TODO: move these activate/deactivate in under the hierarchicial
2073 * irqchip implementation as static once SPMI and SSBI (all external
2074 * users) are phased over.
2077 * gpiochip_irq_domain_activate() - Lock a GPIO to be used as an IRQ
2078 * @domain: The IRQ domain used by this IRQ chip
2079 * @data: Outermost irq_data associated with the IRQ
2080 * @reserve: If set, only reserve an interrupt vector instead of assigning one
2082 * This function is a wrapper that calls gpiochip_lock_as_irq() and is to be
2083 * used as the activate function for the &struct irq_domain_ops. The host_data
2084 * for the IRQ domain must be the &struct gpio_chip.
2086 int gpiochip_irq_domain_activate(struct irq_domain *domain,
2087 struct irq_data *data, bool reserve)
2089 struct gpio_chip *chip = domain->host_data;
2091 return gpiochip_lock_as_irq(chip, data->hwirq);
2093 EXPORT_SYMBOL_GPL(gpiochip_irq_domain_activate);
2096 * gpiochip_irq_domain_deactivate() - Unlock a GPIO used as an IRQ
2097 * @domain: The IRQ domain used by this IRQ chip
2098 * @data: Outermost irq_data associated with the IRQ
2100 * This function is a wrapper that will call gpiochip_unlock_as_irq() and is to
2101 * be used as the deactivate function for the &struct irq_domain_ops. The
2102 * host_data for the IRQ domain must be the &struct gpio_chip.
2104 void gpiochip_irq_domain_deactivate(struct irq_domain *domain,
2105 struct irq_data *data)
2107 struct gpio_chip *chip = domain->host_data;
2109 return gpiochip_unlock_as_irq(chip, data->hwirq);
2111 EXPORT_SYMBOL_GPL(gpiochip_irq_domain_deactivate);
2113 static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
2115 struct irq_domain *domain = chip->irq.domain;
2117 if (!gpiochip_irqchip_irq_valid(chip, offset))
2120 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2121 if (irq_domain_is_hierarchy(domain)) {
2122 struct irq_fwspec spec;
2124 spec.fwnode = domain->fwnode;
2125 spec.param_count = 2;
2126 spec.param[0] = chip->irq.child_offset_to_irq(chip, offset);
2127 spec.param[1] = IRQ_TYPE_NONE;
2129 return irq_create_fwspec_mapping(&spec);
2133 return irq_create_mapping(domain, offset);
2136 static int gpiochip_irq_reqres(struct irq_data *d)
2138 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
2140 return gpiochip_reqres_irq(chip, d->hwirq);
2143 static void gpiochip_irq_relres(struct irq_data *d)
2145 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
2147 gpiochip_relres_irq(chip, d->hwirq);
2150 static void gpiochip_irq_enable(struct irq_data *d)
2152 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
2154 gpiochip_enable_irq(chip, d->hwirq);
2155 if (chip->irq.irq_enable)
2156 chip->irq.irq_enable(d);
2158 chip->irq.chip->irq_unmask(d);
2161 static void gpiochip_irq_disable(struct irq_data *d)
2163 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
2165 if (chip->irq.irq_disable)
2166 chip->irq.irq_disable(d);
2168 chip->irq.chip->irq_mask(d);
2169 gpiochip_disable_irq(chip, d->hwirq);
2172 static void gpiochip_set_irq_hooks(struct gpio_chip *gpiochip)
2174 struct irq_chip *irqchip = gpiochip->irq.chip;
2176 if (!irqchip->irq_request_resources &&
2177 !irqchip->irq_release_resources) {
2178 irqchip->irq_request_resources = gpiochip_irq_reqres;
2179 irqchip->irq_release_resources = gpiochip_irq_relres;
2181 if (WARN_ON(gpiochip->irq.irq_enable))
2183 /* Check if the irqchip already has this hook... */
2184 if (irqchip->irq_enable == gpiochip_irq_enable) {
2186 * ...and if so, give a gentle warning that this is bad
2190 "detected irqchip that is shared with multiple gpiochips: please fix the driver.\n");
2193 gpiochip->irq.irq_enable = irqchip->irq_enable;
2194 gpiochip->irq.irq_disable = irqchip->irq_disable;
2195 irqchip->irq_enable = gpiochip_irq_enable;
2196 irqchip->irq_disable = gpiochip_irq_disable;
2200 * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip
2201 * @gpiochip: the GPIO chip to add the IRQ chip to
2202 * @lock_key: lockdep class for IRQ lock
2203 * @request_key: lockdep class for IRQ request
2205 static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
2206 struct lock_class_key *lock_key,
2207 struct lock_class_key *request_key)
2209 struct irq_chip *irqchip = gpiochip->irq.chip;
2210 const struct irq_domain_ops *ops = NULL;
2211 struct device_node *np;
2218 if (gpiochip->irq.parent_handler && gpiochip->can_sleep) {
2219 chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n");
2223 np = gpiochip->gpiodev->dev.of_node;
2224 type = gpiochip->irq.default_type;
2227 * Specifying a default trigger is a terrible idea if DT or ACPI is
2228 * used to configure the interrupts, as you may end up with
2229 * conflicting triggers. Tell the user, and reset to NONE.
2231 if (WARN(np && type != IRQ_TYPE_NONE,
2232 "%s: Ignoring %u default trigger\n", np->full_name, type))
2233 type = IRQ_TYPE_NONE;
2235 if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) {
2236 acpi_handle_warn(ACPI_HANDLE(gpiochip->parent),
2237 "Ignoring %u default trigger\n", type);
2238 type = IRQ_TYPE_NONE;
2241 gpiochip->to_irq = gpiochip_to_irq;
2242 gpiochip->irq.default_type = type;
2243 gpiochip->irq.lock_key = lock_key;
2244 gpiochip->irq.request_key = request_key;
2246 /* If a parent irqdomain is provided, let's build a hierarchy */
2247 if (gpiochip_hierarchy_is_hierarchical(gpiochip)) {
2248 int ret = gpiochip_hierarchy_add_domain(gpiochip);
2252 /* Some drivers provide custom irqdomain ops */
2253 if (gpiochip->irq.domain_ops)
2254 ops = gpiochip->irq.domain_ops;
2257 ops = &gpiochip_domain_ops;
2258 gpiochip->irq.domain = irq_domain_add_simple(np,
2260 gpiochip->irq.first,
2262 if (!gpiochip->irq.domain)
2266 if (gpiochip->irq.parent_handler) {
2267 void *data = gpiochip->irq.parent_handler_data ?: gpiochip;
2269 for (i = 0; i < gpiochip->irq.num_parents; i++) {
2271 * The parent IRQ chip is already using the chip_data
2272 * for this IRQ chip, so our callbacks simply use the
2275 irq_set_chained_handler_and_data(gpiochip->irq.parents[i],
2276 gpiochip->irq.parent_handler,
2281 gpiochip_set_irq_hooks(gpiochip);
2283 acpi_gpiochip_request_interrupts(gpiochip);
2289 * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip
2290 * @gpiochip: the gpiochip to remove the irqchip from
2292 * This is called only from gpiochip_remove()
2294 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
2296 struct irq_chip *irqchip = gpiochip->irq.chip;
2297 unsigned int offset;
2299 acpi_gpiochip_free_interrupts(gpiochip);
2301 if (irqchip && gpiochip->irq.parent_handler) {
2302 struct gpio_irq_chip *irq = &gpiochip->irq;
2305 for (i = 0; i < irq->num_parents; i++)
2306 irq_set_chained_handler_and_data(irq->parents[i],
2310 /* Remove all IRQ mappings and delete the domain */
2311 if (gpiochip->irq.domain) {
2314 for (offset = 0; offset < gpiochip->ngpio; offset++) {
2315 if (!gpiochip_irqchip_irq_valid(gpiochip, offset))
2318 irq = irq_find_mapping(gpiochip->irq.domain, offset);
2319 irq_dispose_mapping(irq);
2322 irq_domain_remove(gpiochip->irq.domain);
2326 if (irqchip->irq_request_resources == gpiochip_irq_reqres) {
2327 irqchip->irq_request_resources = NULL;
2328 irqchip->irq_release_resources = NULL;
2330 if (irqchip->irq_enable == gpiochip_irq_enable) {
2331 irqchip->irq_enable = gpiochip->irq.irq_enable;
2332 irqchip->irq_disable = gpiochip->irq.irq_disable;
2335 gpiochip->irq.irq_enable = NULL;
2336 gpiochip->irq.irq_disable = NULL;
2337 gpiochip->irq.chip = NULL;
2339 gpiochip_irqchip_free_valid_mask(gpiochip);
2343 * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip
2344 * @gpiochip: the gpiochip to add the irqchip to
2345 * @irqchip: the irqchip to add to the gpiochip
2346 * @first_irq: if not dynamically assigned, the base (first) IRQ to
2347 * allocate gpiochip irqs from
2348 * @handler: the irq handler to use (often a predefined irq core function)
2349 * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE
2350 * to have the core avoid setting up any default type in the hardware.
2351 * @threaded: whether this irqchip uses a nested thread handler
2352 * @lock_key: lockdep class for IRQ lock
2353 * @request_key: lockdep class for IRQ request
2355 * This function closely associates a certain irqchip with a certain
2356 * gpiochip, providing an irq domain to translate the local IRQs to
2357 * global irqs in the gpiolib core, and making sure that the gpiochip
2358 * is passed as chip data to all related functions. Driver callbacks
2359 * need to use gpiochip_get_data() to get their local state containers back
2360 * from the gpiochip passed as chip data. An irqdomain will be stored
2361 * in the gpiochip that shall be used by the driver to handle IRQ number
2362 * translation. The gpiochip will need to be initialized and registered
2363 * before calling this function.
2365 * This function will handle two cell:ed simple IRQs and assumes all
2366 * the pins on the gpiochip can generate a unique IRQ. Everything else
2367 * need to be open coded.
2369 int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip,
2370 struct irq_chip *irqchip,
2371 unsigned int first_irq,
2372 irq_flow_handler_t handler,
2375 struct lock_class_key *lock_key,
2376 struct lock_class_key *request_key)
2378 struct device_node *of_node;
2380 if (!gpiochip || !irqchip)
2383 if (!gpiochip->parent) {
2384 pr_err("missing gpiochip .dev parent pointer\n");
2387 gpiochip->irq.threaded = threaded;
2388 of_node = gpiochip->parent->of_node;
2389 #ifdef CONFIG_OF_GPIO
2391 * If the gpiochip has an assigned OF node this takes precedence
2392 * FIXME: get rid of this and use gpiochip->parent->of_node
2395 if (gpiochip->of_node)
2396 of_node = gpiochip->of_node;
2399 * Specifying a default trigger is a terrible idea if DT or ACPI is
2400 * used to configure the interrupts, as you may end-up with
2401 * conflicting triggers. Tell the user, and reset to NONE.
2403 if (WARN(of_node && type != IRQ_TYPE_NONE,
2404 "%pOF: Ignoring %d default trigger\n", of_node, type))
2405 type = IRQ_TYPE_NONE;
2406 if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) {
2407 acpi_handle_warn(ACPI_HANDLE(gpiochip->parent),
2408 "Ignoring %d default trigger\n", type);
2409 type = IRQ_TYPE_NONE;
2412 gpiochip->irq.chip = irqchip;
2413 gpiochip->irq.handler = handler;
2414 gpiochip->irq.default_type = type;
2415 gpiochip->to_irq = gpiochip_to_irq;
2416 gpiochip->irq.lock_key = lock_key;
2417 gpiochip->irq.request_key = request_key;
2418 gpiochip->irq.domain = irq_domain_add_simple(of_node,
2419 gpiochip->ngpio, first_irq,
2420 &gpiochip_domain_ops, gpiochip);
2421 if (!gpiochip->irq.domain) {
2422 gpiochip->irq.chip = NULL;
2426 gpiochip_set_irq_hooks(gpiochip);
2428 acpi_gpiochip_request_interrupts(gpiochip);
2432 EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key);
2434 #else /* CONFIG_GPIOLIB_IRQCHIP */
2436 static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
2437 struct lock_class_key *lock_key,
2438 struct lock_class_key *request_key)
2443 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {}
2444 static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip)
2448 static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
2451 #endif /* CONFIG_GPIOLIB_IRQCHIP */
2454 * gpiochip_generic_request() - request the gpio function for a pin
2455 * @chip: the gpiochip owning the GPIO
2456 * @offset: the offset of the GPIO to request for GPIO function
2458 int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset)
2460 return pinctrl_gpio_request(chip->gpiodev->base + offset);
2462 EXPORT_SYMBOL_GPL(gpiochip_generic_request);
2465 * gpiochip_generic_free() - free the gpio function from a pin
2466 * @chip: the gpiochip to request the gpio function for
2467 * @offset: the offset of the GPIO to free from GPIO function
2469 void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset)
2471 pinctrl_gpio_free(chip->gpiodev->base + offset);
2473 EXPORT_SYMBOL_GPL(gpiochip_generic_free);
2476 * gpiochip_generic_config() - apply configuration for a pin
2477 * @chip: the gpiochip owning the GPIO
2478 * @offset: the offset of the GPIO to apply the configuration
2479 * @config: the configuration to be applied
2481 int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset,
2482 unsigned long config)
2484 return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config);
2486 EXPORT_SYMBOL_GPL(gpiochip_generic_config);
2488 #ifdef CONFIG_PINCTRL
2491 * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping
2492 * @chip: the gpiochip to add the range for
2493 * @pctldev: the pin controller to map to
2494 * @gpio_offset: the start offset in the current gpio_chip number space
2495 * @pin_group: name of the pin group inside the pin controller
2497 * Calling this function directly from a DeviceTree-supported
2498 * pinctrl driver is DEPRECATED. Please see Section 2.1 of
2499 * Documentation/devicetree/bindings/gpio/gpio.txt on how to
2500 * bind pinctrl and gpio drivers via the "gpio-ranges" property.
2502 int gpiochip_add_pingroup_range(struct gpio_chip *chip,
2503 struct pinctrl_dev *pctldev,
2504 unsigned int gpio_offset, const char *pin_group)
2506 struct gpio_pin_range *pin_range;
2507 struct gpio_device *gdev = chip->gpiodev;
2510 pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
2512 chip_err(chip, "failed to allocate pin ranges\n");
2516 /* Use local offset as range ID */
2517 pin_range->range.id = gpio_offset;
2518 pin_range->range.gc = chip;
2519 pin_range->range.name = chip->label;
2520 pin_range->range.base = gdev->base + gpio_offset;
2521 pin_range->pctldev = pctldev;
2523 ret = pinctrl_get_group_pins(pctldev, pin_group,
2524 &pin_range->range.pins,
2525 &pin_range->range.npins);
2531 pinctrl_add_gpio_range(pctldev, &pin_range->range);
2533 chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n",
2534 gpio_offset, gpio_offset + pin_range->range.npins - 1,
2535 pinctrl_dev_get_devname(pctldev), pin_group);
2537 list_add_tail(&pin_range->node, &gdev->pin_ranges);
2541 EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range);
2544 * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping
2545 * @chip: the gpiochip to add the range for
2546 * @pinctl_name: the dev_name() of the pin controller to map to
2547 * @gpio_offset: the start offset in the current gpio_chip number space
2548 * @pin_offset: the start offset in the pin controller number space
2549 * @npins: the number of pins from the offset of each pin space (GPIO and
2550 * pin controller) to accumulate in this range
2553 * 0 on success, or a negative error-code on failure.
2555 * Calling this function directly from a DeviceTree-supported
2556 * pinctrl driver is DEPRECATED. Please see Section 2.1 of
2557 * Documentation/devicetree/bindings/gpio/gpio.txt on how to
2558 * bind pinctrl and gpio drivers via the "gpio-ranges" property.
2560 int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
2561 unsigned int gpio_offset, unsigned int pin_offset,
2564 struct gpio_pin_range *pin_range;
2565 struct gpio_device *gdev = chip->gpiodev;
2568 pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
2570 chip_err(chip, "failed to allocate pin ranges\n");
2574 /* Use local offset as range ID */
2575 pin_range->range.id = gpio_offset;
2576 pin_range->range.gc = chip;
2577 pin_range->range.name = chip->label;
2578 pin_range->range.base = gdev->base + gpio_offset;
2579 pin_range->range.pin_base = pin_offset;
2580 pin_range->range.npins = npins;
2581 pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name,
2583 if (IS_ERR(pin_range->pctldev)) {
2584 ret = PTR_ERR(pin_range->pctldev);
2585 chip_err(chip, "could not create pin range\n");
2589 chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n",
2590 gpio_offset, gpio_offset + npins - 1,
2592 pin_offset, pin_offset + npins - 1);
2594 list_add_tail(&pin_range->node, &gdev->pin_ranges);
2598 EXPORT_SYMBOL_GPL(gpiochip_add_pin_range);
2601 * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings
2602 * @chip: the chip to remove all the mappings for
2604 void gpiochip_remove_pin_ranges(struct gpio_chip *chip)
2606 struct gpio_pin_range *pin_range, *tmp;
2607 struct gpio_device *gdev = chip->gpiodev;
2609 list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) {
2610 list_del(&pin_range->node);
2611 pinctrl_remove_gpio_range(pin_range->pctldev,
2616 EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges);
2618 #endif /* CONFIG_PINCTRL */
2620 /* These "optional" allocation calls help prevent drivers from stomping
2621 * on each other, and help provide better diagnostics in debugfs.
2622 * They're called even less than the "set direction" calls.
2624 static int gpiod_request_commit(struct gpio_desc *desc, const char *label)
2626 struct gpio_chip *chip = desc->gdev->chip;
2628 unsigned long flags;
2632 label = kstrdup_const(label, GFP_KERNEL);
2637 spin_lock_irqsave(&gpio_lock, flags);
2639 /* NOTE: gpio_request() can be called in early boot,
2640 * before IRQs are enabled, for non-sleeping (SOC) GPIOs.
2643 if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) {
2644 desc_set_label(desc, label ? : "?");
2652 if (chip->request) {
2653 /* chip->request may sleep */
2654 spin_unlock_irqrestore(&gpio_lock, flags);
2655 offset = gpio_chip_hwgpio(desc);
2656 if (gpiochip_line_is_valid(chip, offset))
2657 ret = chip->request(chip, offset);
2660 spin_lock_irqsave(&gpio_lock, flags);
2663 desc_set_label(desc, NULL);
2665 clear_bit(FLAG_REQUESTED, &desc->flags);
2669 if (chip->get_direction) {
2670 /* chip->get_direction may sleep */
2671 spin_unlock_irqrestore(&gpio_lock, flags);
2672 gpiod_get_direction(desc);
2673 spin_lock_irqsave(&gpio_lock, flags);
2676 spin_unlock_irqrestore(&gpio_lock, flags);
2681 * This descriptor validation needs to be inserted verbatim into each
2682 * function taking a descriptor, so we need to use a preprocessor
2683 * macro to avoid endless duplication. If the desc is NULL it is an
2684 * optional GPIO and calls should just bail out.
2686 static int validate_desc(const struct gpio_desc *desc, const char *func)
2691 pr_warn("%s: invalid GPIO (errorpointer)\n", func);
2692 return PTR_ERR(desc);
2695 pr_warn("%s: invalid GPIO (no device)\n", func);
2698 if (!desc->gdev->chip) {
2699 dev_warn(&desc->gdev->dev,
2700 "%s: backing chip is gone\n", func);
2706 #define VALIDATE_DESC(desc) do { \
2707 int __valid = validate_desc(desc, __func__); \
2712 #define VALIDATE_DESC_VOID(desc) do { \
2713 int __valid = validate_desc(desc, __func__); \
2718 int gpiod_request(struct gpio_desc *desc, const char *label)
2720 int ret = -EPROBE_DEFER;
2721 struct gpio_device *gdev;
2723 VALIDATE_DESC(desc);
2726 if (try_module_get(gdev->owner)) {
2727 ret = gpiod_request_commit(desc, label);
2729 module_put(gdev->owner);
2731 get_device(&gdev->dev);
2735 gpiod_dbg(desc, "%s: status %d\n", __func__, ret);
2740 static bool gpiod_free_commit(struct gpio_desc *desc)
2743 unsigned long flags;
2744 struct gpio_chip *chip;
2748 gpiod_unexport(desc);
2750 spin_lock_irqsave(&gpio_lock, flags);
2752 chip = desc->gdev->chip;
2753 if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) {
2755 spin_unlock_irqrestore(&gpio_lock, flags);
2756 might_sleep_if(chip->can_sleep);
2757 chip->free(chip, gpio_chip_hwgpio(desc));
2758 spin_lock_irqsave(&gpio_lock, flags);
2760 kfree_const(desc->label);
2761 desc_set_label(desc, NULL);
2762 clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
2763 clear_bit(FLAG_REQUESTED, &desc->flags);
2764 clear_bit(FLAG_OPEN_DRAIN, &desc->flags);
2765 clear_bit(FLAG_OPEN_SOURCE, &desc->flags);
2766 clear_bit(FLAG_IS_HOGGED, &desc->flags);
2770 spin_unlock_irqrestore(&gpio_lock, flags);
2774 void gpiod_free(struct gpio_desc *desc)
2776 if (desc && desc->gdev && gpiod_free_commit(desc)) {
2777 module_put(desc->gdev->owner);
2778 put_device(&desc->gdev->dev);
2780 WARN_ON(extra_checks);
2785 * gpiochip_is_requested - return string iff signal was requested
2786 * @chip: controller managing the signal
2787 * @offset: of signal within controller's 0..(ngpio - 1) range
2789 * Returns NULL if the GPIO is not currently requested, else a string.
2790 * The string returned is the label passed to gpio_request(); if none has been
2791 * passed it is a meaningless, non-NULL constant.
2793 * This function is for use by GPIO controller drivers. The label can
2794 * help with diagnostics, and knowing that the signal is used as a GPIO
2795 * can help avoid accidentally multiplexing it to another controller.
2797 const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset)
2799 struct gpio_desc *desc;
2801 if (offset >= chip->ngpio)
2804 desc = &chip->gpiodev->descs[offset];
2806 if (test_bit(FLAG_REQUESTED, &desc->flags) == 0)
2810 EXPORT_SYMBOL_GPL(gpiochip_is_requested);
2813 * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor
2815 * @hwnum: hardware number of the GPIO for which to request the descriptor
2816 * @label: label for the GPIO
2817 * @lflags: lookup flags for this GPIO or 0 if default, this can be used to
2818 * specify things like line inversion semantics with the machine flags
2819 * such as GPIO_OUT_LOW
2820 * @dflags: descriptor request flags for this GPIO or 0 if default, this
2821 * can be used to specify consumer semantics such as open drain
2823 * Function allows GPIO chip drivers to request and use their own GPIO
2824 * descriptors via gpiolib API. Difference to gpiod_request() is that this
2825 * function will not increase reference count of the GPIO chip module. This
2826 * allows the GPIO chip module to be unloaded as needed (we assume that the
2827 * GPIO chip driver handles freeing the GPIOs it has requested).
2830 * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error
2833 struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
2835 enum gpio_lookup_flags lflags,
2836 enum gpiod_flags dflags)
2838 struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum);
2842 chip_err(chip, "failed to get GPIO descriptor\n");
2846 ret = gpiod_request_commit(desc, label);
2848 return ERR_PTR(ret);
2850 ret = gpiod_configure_flags(desc, label, lflags, dflags);
2852 chip_err(chip, "setup of own GPIO %s failed\n", label);
2853 gpiod_free_commit(desc);
2854 return ERR_PTR(ret);
2859 EXPORT_SYMBOL_GPL(gpiochip_request_own_desc);
2862 * gpiochip_free_own_desc - Free GPIO requested by the chip driver
2863 * @desc: GPIO descriptor to free
2865 * Function frees the given GPIO requested previously with
2866 * gpiochip_request_own_desc().
2868 void gpiochip_free_own_desc(struct gpio_desc *desc)
2871 gpiod_free_commit(desc);
2873 EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);
2876 * Drivers MUST set GPIO direction before making get/set calls. In
2877 * some cases this is done in early boot, before IRQs are enabled.
2879 * As a rule these aren't called more than once (except for drivers
2880 * using the open-drain emulation idiom) so these are natural places
2881 * to accumulate extra debugging checks. Note that we can't (yet)
2882 * rely on gpio_request() having been called beforehand.
2885 static int gpio_set_config(struct gpio_chip *gc, unsigned offset,
2886 enum pin_config_param mode)
2888 unsigned long config;
2892 case PIN_CONFIG_BIAS_PULL_DOWN:
2893 case PIN_CONFIG_BIAS_PULL_UP:
2901 config = PIN_CONF_PACKED(mode, arg);
2902 return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP;
2906 * gpiod_direction_input - set the GPIO direction to input
2907 * @desc: GPIO to set to input
2909 * Set the direction of the passed GPIO to input, such as gpiod_get_value() can
2910 * be called safely on it.
2912 * Return 0 in case of success, else an error code.
2914 int gpiod_direction_input(struct gpio_desc *desc)
2916 struct gpio_chip *chip;
2919 VALIDATE_DESC(desc);
2920 chip = desc->gdev->chip;
2923 * It is legal to have no .get() and .direction_input() specified if
2924 * the chip is output-only, but you can't specify .direction_input()
2925 * and not support the .get() operation, that doesn't make sense.
2927 if (!chip->get && chip->direction_input) {
2929 "%s: missing get() but have direction_input()\n",
2935 * If we have a .direction_input() callback, things are simple,
2936 * just call it. Else we are some input-only chip so try to check the
2937 * direction (if .get_direction() is supported) else we silently
2938 * assume we are in input mode after this.
2940 if (chip->direction_input) {
2941 ret = chip->direction_input(chip, gpio_chip_hwgpio(desc));
2942 } else if (chip->get_direction &&
2943 (chip->get_direction(chip, gpio_chip_hwgpio(desc)) != 1)) {
2945 "%s: missing direction_input() operation and line is output\n",
2950 clear_bit(FLAG_IS_OUT, &desc->flags);
2952 if (test_bit(FLAG_PULL_UP, &desc->flags))
2953 gpio_set_config(chip, gpio_chip_hwgpio(desc),
2954 PIN_CONFIG_BIAS_PULL_UP);
2955 else if (test_bit(FLAG_PULL_DOWN, &desc->flags))
2956 gpio_set_config(chip, gpio_chip_hwgpio(desc),
2957 PIN_CONFIG_BIAS_PULL_DOWN);
2959 trace_gpio_direction(desc_to_gpio(desc), 1, ret);
2963 EXPORT_SYMBOL_GPL(gpiod_direction_input);
2965 static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value)
2967 struct gpio_chip *gc = desc->gdev->chip;
2972 * It's OK not to specify .direction_output() if the gpiochip is
2973 * output-only, but if there is then not even a .set() operation it
2974 * is pretty tricky to drive the output line.
2976 if (!gc->set && !gc->direction_output) {
2978 "%s: missing set() and direction_output() operations\n",
2983 if (gc->direction_output) {
2984 ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val);
2986 /* Check that we are in output mode if we can */
2987 if (gc->get_direction &&
2988 gc->get_direction(gc, gpio_chip_hwgpio(desc))) {
2990 "%s: missing direction_output() operation\n",
2995 * If we can't actively set the direction, we are some
2996 * output-only chip, so just drive the output as desired.
2998 gc->set(gc, gpio_chip_hwgpio(desc), val);
3002 set_bit(FLAG_IS_OUT, &desc->flags);
3003 trace_gpio_value(desc_to_gpio(desc), 0, val);
3004 trace_gpio_direction(desc_to_gpio(desc), 0, ret);
3009 * gpiod_direction_output_raw - set the GPIO direction to output
3010 * @desc: GPIO to set to output
3011 * @value: initial output value of the GPIO
3013 * Set the direction of the passed GPIO to output, such as gpiod_set_value() can
3014 * be called safely on it. The initial value of the output must be specified
3015 * as raw value on the physical line without regard for the ACTIVE_LOW status.
3017 * Return 0 in case of success, else an error code.
3019 int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
3021 VALIDATE_DESC(desc);
3022 return gpiod_direction_output_raw_commit(desc, value);
3024 EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
3027 * gpiod_direction_output - set the GPIO direction to output
3028 * @desc: GPIO to set to output
3029 * @value: initial output value of the GPIO
3031 * Set the direction of the passed GPIO to output, such as gpiod_set_value() can
3032 * be called safely on it. The initial value of the output must be specified
3033 * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
3036 * Return 0 in case of success, else an error code.
3038 int gpiod_direction_output(struct gpio_desc *desc, int value)
3040 struct gpio_chip *gc;
3043 VALIDATE_DESC(desc);
3044 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3049 /* GPIOs used for enabled IRQs shall not be set as output */
3050 if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
3051 test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
3053 "%s: tried to set a GPIO tied to an IRQ as output\n",
3058 gc = desc->gdev->chip;
3059 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
3060 /* First see if we can enable open drain in hardware */
3061 ret = gpio_set_config(gc, gpio_chip_hwgpio(desc),
3062 PIN_CONFIG_DRIVE_OPEN_DRAIN);
3064 goto set_output_value;
3065 /* Emulate open drain by not actively driving the line high */
3067 return gpiod_direction_input(desc);
3069 else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
3070 ret = gpio_set_config(gc, gpio_chip_hwgpio(desc),
3071 PIN_CONFIG_DRIVE_OPEN_SOURCE);
3073 goto set_output_value;
3074 /* Emulate open source by not actively driving the line low */
3076 return gpiod_direction_input(desc);
3078 gpio_set_config(gc, gpio_chip_hwgpio(desc),
3079 PIN_CONFIG_DRIVE_PUSH_PULL);
3083 return gpiod_direction_output_raw_commit(desc, value);
3085 EXPORT_SYMBOL_GPL(gpiod_direction_output);
3088 * gpiod_set_debounce - sets @debounce time for a GPIO
3089 * @desc: descriptor of the GPIO for which to set debounce time
3090 * @debounce: debounce time in microseconds
3093 * 0 on success, %-ENOTSUPP if the controller doesn't support setting the
3096 int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
3098 struct gpio_chip *chip;
3099 unsigned long config;
3101 VALIDATE_DESC(desc);
3102 chip = desc->gdev->chip;
3103 if (!chip->set || !chip->set_config) {
3105 "%s: missing set() or set_config() operations\n",
3110 config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce);
3111 return chip->set_config(chip, gpio_chip_hwgpio(desc), config);
3113 EXPORT_SYMBOL_GPL(gpiod_set_debounce);
3116 * gpiod_set_transitory - Lose or retain GPIO state on suspend or reset
3117 * @desc: descriptor of the GPIO for which to configure persistence
3118 * @transitory: True to lose state on suspend or reset, false for persistence
3121 * 0 on success, otherwise a negative error code.
3123 int gpiod_set_transitory(struct gpio_desc *desc, bool transitory)
3125 struct gpio_chip *chip;
3126 unsigned long packed;
3130 VALIDATE_DESC(desc);
3132 * Handle FLAG_TRANSITORY first, enabling queries to gpiolib for
3133 * persistence state.
3136 set_bit(FLAG_TRANSITORY, &desc->flags);
3138 clear_bit(FLAG_TRANSITORY, &desc->flags);
3140 /* If the driver supports it, set the persistence state now */
3141 chip = desc->gdev->chip;
3142 if (!chip->set_config)
3145 packed = pinconf_to_config_packed(PIN_CONFIG_PERSIST_STATE,
3147 gpio = gpio_chip_hwgpio(desc);
3148 rc = chip->set_config(chip, gpio, packed);
3149 if (rc == -ENOTSUPP) {
3150 dev_dbg(&desc->gdev->dev, "Persistence not supported for GPIO %d\n",
3157 EXPORT_SYMBOL_GPL(gpiod_set_transitory);
3160 * gpiod_is_active_low - test whether a GPIO is active-low or not
3161 * @desc: the gpio descriptor to test
3163 * Returns 1 if the GPIO is active-low, 0 otherwise.
3165 int gpiod_is_active_low(const struct gpio_desc *desc)
3167 VALIDATE_DESC(desc);
3168 return test_bit(FLAG_ACTIVE_LOW, &desc->flags);
3170 EXPORT_SYMBOL_GPL(gpiod_is_active_low);
3172 /* I/O calls are only valid after configuration completed; the relevant
3173 * "is this a valid GPIO" error checks should already have been done.
3175 * "Get" operations are often inlinable as reading a pin value register,
3176 * and masking the relevant bit in that register.
3178 * When "set" operations are inlinable, they involve writing that mask to
3179 * one register to set a low value, or a different register to set it high.
3180 * Otherwise locking is needed, so there may be little value to inlining.
3182 *------------------------------------------------------------------------
3184 * IMPORTANT!!! The hot paths -- get/set value -- assume that callers
3185 * have requested the GPIO. That can include implicit requesting by
3186 * a direction setting call. Marking a gpio as requested locks its chip
3187 * in memory, guaranteeing that these table lookups need no more locking
3188 * and that gpiochip_remove() will fail.
3190 * REVISIT when debugging, consider adding some instrumentation to ensure
3191 * that the GPIO was actually requested.
3194 static int gpiod_get_raw_value_commit(const struct gpio_desc *desc)
3196 struct gpio_chip *chip;
3200 chip = desc->gdev->chip;
3201 offset = gpio_chip_hwgpio(desc);
3202 value = chip->get ? chip->get(chip, offset) : -EIO;
3203 value = value < 0 ? value : !!value;
3204 trace_gpio_value(desc_to_gpio(desc), 1, value);
3208 static int gpio_chip_get_multiple(struct gpio_chip *chip,
3209 unsigned long *mask, unsigned long *bits)
3211 if (chip->get_multiple) {
3212 return chip->get_multiple(chip, mask, bits);
3213 } else if (chip->get) {
3216 for_each_set_bit(i, mask, chip->ngpio) {
3217 value = chip->get(chip, i);
3220 __assign_bit(i, bits, value);
3227 int gpiod_get_array_value_complex(bool raw, bool can_sleep,
3228 unsigned int array_size,
3229 struct gpio_desc **desc_array,
3230 struct gpio_array *array_info,
3231 unsigned long *value_bitmap)
3236 * Validate array_info against desc_array and its size.
3237 * It should immediately follow desc_array if both
3238 * have been obtained from the same gpiod_get_array() call.
3240 if (array_info && array_info->desc == desc_array &&
3241 array_size <= array_info->size &&
3242 (void *)array_info == desc_array + array_info->size) {
3244 WARN_ON(array_info->chip->can_sleep);
3246 ret = gpio_chip_get_multiple(array_info->chip,
3247 array_info->get_mask,
3252 if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
3253 bitmap_xor(value_bitmap, value_bitmap,
3254 array_info->invert_mask, array_size);
3256 if (bitmap_full(array_info->get_mask, array_size))
3259 i = find_first_zero_bit(array_info->get_mask, array_size);
3264 while (i < array_size) {
3265 struct gpio_chip *chip = desc_array[i]->gdev->chip;
3266 unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
3267 unsigned long *mask, *bits;
3270 if (likely(chip->ngpio <= FASTPATH_NGPIO)) {
3273 mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio),
3275 can_sleep ? GFP_KERNEL : GFP_ATOMIC);
3280 bits = mask + BITS_TO_LONGS(chip->ngpio);
3281 bitmap_zero(mask, chip->ngpio);
3284 WARN_ON(chip->can_sleep);
3286 /* collect all inputs belonging to the same chip */
3289 const struct gpio_desc *desc = desc_array[i];
3290 int hwgpio = gpio_chip_hwgpio(desc);
3292 __set_bit(hwgpio, mask);
3296 i = find_next_zero_bit(array_info->get_mask,
3298 } while ((i < array_size) &&
3299 (desc_array[i]->gdev->chip == chip));
3301 ret = gpio_chip_get_multiple(chip, mask, bits);
3303 if (mask != fastpath)
3308 for (j = first; j < i; ) {
3309 const struct gpio_desc *desc = desc_array[j];
3310 int hwgpio = gpio_chip_hwgpio(desc);
3311 int value = test_bit(hwgpio, bits);
3313 if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3315 __assign_bit(j, value_bitmap, value);
3316 trace_gpio_value(desc_to_gpio(desc), 1, value);
3320 j = find_next_zero_bit(array_info->get_mask, i,
3324 if (mask != fastpath)
3331 * gpiod_get_raw_value() - return a gpio's raw value
3332 * @desc: gpio whose value will be returned
3334 * Return the GPIO's raw value, i.e. the value of the physical line disregarding
3335 * its ACTIVE_LOW status, or negative errno on failure.
3337 * This function can be called from contexts where we cannot sleep, and will
3338 * complain if the GPIO chip functions potentially sleep.
3340 int gpiod_get_raw_value(const struct gpio_desc *desc)
3342 VALIDATE_DESC(desc);
3343 /* Should be using gpiod_get_raw_value_cansleep() */
3344 WARN_ON(desc->gdev->chip->can_sleep);
3345 return gpiod_get_raw_value_commit(desc);
3347 EXPORT_SYMBOL_GPL(gpiod_get_raw_value);
3350 * gpiod_get_value() - return a gpio's value
3351 * @desc: gpio whose value will be returned
3353 * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into
3354 * account, or negative errno on failure.
3356 * This function can be called from contexts where we cannot sleep, and will
3357 * complain if the GPIO chip functions potentially sleep.
3359 int gpiod_get_value(const struct gpio_desc *desc)
3363 VALIDATE_DESC(desc);
3364 /* Should be using gpiod_get_value_cansleep() */
3365 WARN_ON(desc->gdev->chip->can_sleep);
3367 value = gpiod_get_raw_value_commit(desc);
3371 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3376 EXPORT_SYMBOL_GPL(gpiod_get_value);
3379 * gpiod_get_raw_array_value() - read raw values from an array of GPIOs
3380 * @array_size: number of elements in the descriptor array / value bitmap
3381 * @desc_array: array of GPIO descriptors whose values will be read
3382 * @array_info: information on applicability of fast bitmap processing path
3383 * @value_bitmap: bitmap to store the read values
3385 * Read the raw values of the GPIOs, i.e. the values of the physical lines
3386 * without regard for their ACTIVE_LOW status. Return 0 in case of success,
3387 * else an error code.
3389 * This function can be called from contexts where we cannot sleep,
3390 * and it will complain if the GPIO chip functions potentially sleep.
3392 int gpiod_get_raw_array_value(unsigned int array_size,
3393 struct gpio_desc **desc_array,
3394 struct gpio_array *array_info,
3395 unsigned long *value_bitmap)
3399 return gpiod_get_array_value_complex(true, false, array_size,
3400 desc_array, array_info,
3403 EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
3406 * gpiod_get_array_value() - read values from an array of GPIOs
3407 * @array_size: number of elements in the descriptor array / value bitmap
3408 * @desc_array: array of GPIO descriptors whose values will be read
3409 * @array_info: information on applicability of fast bitmap processing path
3410 * @value_bitmap: bitmap to store the read values
3412 * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
3413 * into account. Return 0 in case of success, else an error code.
3415 * This function can be called from contexts where we cannot sleep,
3416 * and it will complain if the GPIO chip functions potentially sleep.
3418 int gpiod_get_array_value(unsigned int array_size,
3419 struct gpio_desc **desc_array,
3420 struct gpio_array *array_info,
3421 unsigned long *value_bitmap)
3425 return gpiod_get_array_value_complex(false, false, array_size,
3426 desc_array, array_info,
3429 EXPORT_SYMBOL_GPL(gpiod_get_array_value);
3432 * gpio_set_open_drain_value_commit() - Set the open drain gpio's value.
3433 * @desc: gpio descriptor whose state need to be set.
3434 * @value: Non-zero for setting it HIGH otherwise it will set to LOW.
3436 static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value)
3439 struct gpio_chip *chip = desc->gdev->chip;
3440 int offset = gpio_chip_hwgpio(desc);
3443 ret = chip->direction_input(chip, offset);
3445 clear_bit(FLAG_IS_OUT, &desc->flags);
3447 ret = chip->direction_output(chip, offset, 0);
3449 set_bit(FLAG_IS_OUT, &desc->flags);
3451 trace_gpio_direction(desc_to_gpio(desc), value, ret);
3454 "%s: Error in set_value for open drain err %d\n",
3459 * _gpio_set_open_source_value() - Set the open source gpio's value.
3460 * @desc: gpio descriptor whose state need to be set.
3461 * @value: Non-zero for setting it HIGH otherwise it will set to LOW.
3463 static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value)
3466 struct gpio_chip *chip = desc->gdev->chip;
3467 int offset = gpio_chip_hwgpio(desc);
3470 ret = chip->direction_output(chip, offset, 1);
3472 set_bit(FLAG_IS_OUT, &desc->flags);
3474 ret = chip->direction_input(chip, offset);
3476 clear_bit(FLAG_IS_OUT, &desc->flags);
3478 trace_gpio_direction(desc_to_gpio(desc), !value, ret);
3481 "%s: Error in set_value for open source err %d\n",
3485 static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value)
3487 struct gpio_chip *chip;
3489 chip = desc->gdev->chip;
3490 trace_gpio_value(desc_to_gpio(desc), 0, value);
3491 chip->set(chip, gpio_chip_hwgpio(desc), value);
3495 * set multiple outputs on the same chip;
3496 * use the chip's set_multiple function if available;
3497 * otherwise set the outputs sequentially;
3498 * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word
3499 * defines which outputs are to be changed
3500 * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word
3501 * defines the values the outputs specified by mask are to be set to
3503 static void gpio_chip_set_multiple(struct gpio_chip *chip,
3504 unsigned long *mask, unsigned long *bits)
3506 if (chip->set_multiple) {
3507 chip->set_multiple(chip, mask, bits);
3511 /* set outputs if the corresponding mask bit is set */
3512 for_each_set_bit(i, mask, chip->ngpio)
3513 chip->set(chip, i, test_bit(i, bits));
3517 int gpiod_set_array_value_complex(bool raw, bool can_sleep,
3518 unsigned int array_size,
3519 struct gpio_desc **desc_array,
3520 struct gpio_array *array_info,
3521 unsigned long *value_bitmap)
3526 * Validate array_info against desc_array and its size.
3527 * It should immediately follow desc_array if both
3528 * have been obtained from the same gpiod_get_array() call.
3530 if (array_info && array_info->desc == desc_array &&
3531 array_size <= array_info->size &&
3532 (void *)array_info == desc_array + array_info->size) {
3534 WARN_ON(array_info->chip->can_sleep);
3536 if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
3537 bitmap_xor(value_bitmap, value_bitmap,
3538 array_info->invert_mask, array_size);
3540 gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
3543 if (bitmap_full(array_info->set_mask, array_size))
3546 i = find_first_zero_bit(array_info->set_mask, array_size);
3551 while (i < array_size) {
3552 struct gpio_chip *chip = desc_array[i]->gdev->chip;
3553 unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
3554 unsigned long *mask, *bits;
3557 if (likely(chip->ngpio <= FASTPATH_NGPIO)) {
3560 mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio),
3562 can_sleep ? GFP_KERNEL : GFP_ATOMIC);
3567 bits = mask + BITS_TO_LONGS(chip->ngpio);
3568 bitmap_zero(mask, chip->ngpio);
3571 WARN_ON(chip->can_sleep);
3574 struct gpio_desc *desc = desc_array[i];
3575 int hwgpio = gpio_chip_hwgpio(desc);
3576 int value = test_bit(i, value_bitmap);
3579 * Pins applicable for fast input but not for
3580 * fast output processing may have been already
3581 * inverted inside the fast path, skip them.
3583 if (!raw && !(array_info &&
3584 test_bit(i, array_info->invert_mask)) &&
3585 test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3587 trace_gpio_value(desc_to_gpio(desc), 0, value);
3589 * collect all normal outputs belonging to the same chip
3590 * open drain and open source outputs are set individually
3592 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) {
3593 gpio_set_open_drain_value_commit(desc, value);
3594 } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) {
3595 gpio_set_open_source_value_commit(desc, value);
3597 __set_bit(hwgpio, mask);
3599 __set_bit(hwgpio, bits);
3601 __clear_bit(hwgpio, bits);
3607 i = find_next_zero_bit(array_info->set_mask,
3609 } while ((i < array_size) &&
3610 (desc_array[i]->gdev->chip == chip));
3611 /* push collected bits to outputs */
3613 gpio_chip_set_multiple(chip, mask, bits);
3615 if (mask != fastpath)
3622 * gpiod_set_raw_value() - assign a gpio's raw value
3623 * @desc: gpio whose value will be assigned
3624 * @value: value to assign
3626 * Set the raw value of the GPIO, i.e. the value of its physical line without
3627 * regard for its ACTIVE_LOW status.
3629 * This function can be called from contexts where we cannot sleep, and will
3630 * complain if the GPIO chip functions potentially sleep.
3632 void gpiod_set_raw_value(struct gpio_desc *desc, int value)
3634 VALIDATE_DESC_VOID(desc);
3635 /* Should be using gpiod_set_raw_value_cansleep() */
3636 WARN_ON(desc->gdev->chip->can_sleep);
3637 gpiod_set_raw_value_commit(desc, value);
3639 EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
3642 * gpiod_set_value_nocheck() - set a GPIO line value without checking
3643 * @desc: the descriptor to set the value on
3644 * @value: value to set
3646 * This sets the value of a GPIO line backing a descriptor, applying
3647 * different semantic quirks like active low and open drain/source
3650 static void gpiod_set_value_nocheck(struct gpio_desc *desc, int value)
3652 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
3654 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
3655 gpio_set_open_drain_value_commit(desc, value);
3656 else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
3657 gpio_set_open_source_value_commit(desc, value);
3659 gpiod_set_raw_value_commit(desc, value);
3663 * gpiod_set_value() - assign a gpio's value
3664 * @desc: gpio whose value will be assigned
3665 * @value: value to assign
3667 * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW,
3668 * OPEN_DRAIN and OPEN_SOURCE flags into account.
3670 * This function can be called from contexts where we cannot sleep, and will
3671 * complain if the GPIO chip functions potentially sleep.
3673 void gpiod_set_value(struct gpio_desc *desc, int value)
3675 VALIDATE_DESC_VOID(desc);
3676 /* Should be using gpiod_set_value_cansleep() */
3677 WARN_ON(desc->gdev->chip->can_sleep);
3678 gpiod_set_value_nocheck(desc, value);
3680 EXPORT_SYMBOL_GPL(gpiod_set_value);
3683 * gpiod_set_raw_array_value() - assign values to an array of GPIOs
3684 * @array_size: number of elements in the descriptor array / value bitmap
3685 * @desc_array: array of GPIO descriptors whose values will be assigned
3686 * @array_info: information on applicability of fast bitmap processing path
3687 * @value_bitmap: bitmap of values to assign
3689 * Set the raw values of the GPIOs, i.e. the values of the physical lines
3690 * without regard for their ACTIVE_LOW status.
3692 * This function can be called from contexts where we cannot sleep, and will
3693 * complain if the GPIO chip functions potentially sleep.
3695 int gpiod_set_raw_array_value(unsigned int array_size,
3696 struct gpio_desc **desc_array,
3697 struct gpio_array *array_info,
3698 unsigned long *value_bitmap)
3702 return gpiod_set_array_value_complex(true, false, array_size,
3703 desc_array, array_info, value_bitmap);
3705 EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
3708 * gpiod_set_array_value() - assign values to an array of GPIOs
3709 * @array_size: number of elements in the descriptor array / value bitmap
3710 * @desc_array: array of GPIO descriptors whose values will be assigned
3711 * @array_info: information on applicability of fast bitmap processing path
3712 * @value_bitmap: bitmap of values to assign
3714 * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
3717 * This function can be called from contexts where we cannot sleep, and will
3718 * complain if the GPIO chip functions potentially sleep.
3720 int gpiod_set_array_value(unsigned int array_size,
3721 struct gpio_desc **desc_array,
3722 struct gpio_array *array_info,
3723 unsigned long *value_bitmap)
3727 return gpiod_set_array_value_complex(false, false, array_size,
3728 desc_array, array_info,
3731 EXPORT_SYMBOL_GPL(gpiod_set_array_value);
3734 * gpiod_cansleep() - report whether gpio value access may sleep
3735 * @desc: gpio to check
3738 int gpiod_cansleep(const struct gpio_desc *desc)
3740 VALIDATE_DESC(desc);
3741 return desc->gdev->chip->can_sleep;
3743 EXPORT_SYMBOL_GPL(gpiod_cansleep);
3746 * gpiod_set_consumer_name() - set the consumer name for the descriptor
3747 * @desc: gpio to set the consumer name on
3748 * @name: the new consumer name
3750 int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name)
3752 VALIDATE_DESC(desc);
3754 name = kstrdup_const(name, GFP_KERNEL);
3759 kfree_const(desc->label);
3760 desc_set_label(desc, name);
3764 EXPORT_SYMBOL_GPL(gpiod_set_consumer_name);
3767 * gpiod_to_irq() - return the IRQ corresponding to a GPIO
3768 * @desc: gpio whose IRQ will be returned (already requested)
3770 * Return the IRQ corresponding to the passed GPIO, or an error code in case of
3773 int gpiod_to_irq(const struct gpio_desc *desc)
3775 struct gpio_chip *chip;
3779 * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics
3780 * requires this function to not return zero on an invalid descriptor
3781 * but rather a negative error number.
3783 if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip)
3786 chip = desc->gdev->chip;
3787 offset = gpio_chip_hwgpio(desc);
3789 int retirq = chip->to_irq(chip, offset);
3791 /* Zero means NO_IRQ */
3799 EXPORT_SYMBOL_GPL(gpiod_to_irq);
3802 * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ
3803 * @chip: the chip the GPIO to lock belongs to
3804 * @offset: the offset of the GPIO to lock as IRQ
3806 * This is used directly by GPIO drivers that want to lock down
3807 * a certain GPIO line to be used for IRQs.
3809 int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
3811 struct gpio_desc *desc;
3813 desc = gpiochip_get_desc(chip, offset);
3815 return PTR_ERR(desc);
3818 * If it's fast: flush the direction setting if something changed
3821 if (!chip->can_sleep && chip->get_direction) {
3822 int dir = gpiod_get_direction(desc);
3825 chip_err(chip, "%s: cannot get GPIO direction\n",
3831 if (test_bit(FLAG_IS_OUT, &desc->flags)) {
3833 "%s: tried to flag a GPIO set as output for IRQ\n",
3838 set_bit(FLAG_USED_AS_IRQ, &desc->flags);
3839 set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
3842 * If the consumer has not set up a label (such as when the
3843 * IRQ is referenced from .to_irq()) we set up a label here
3844 * so it is clear this is used as an interrupt.
3847 desc_set_label(desc, "interrupt");
3851 EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq);
3854 * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ
3855 * @chip: the chip the GPIO to lock belongs to
3856 * @offset: the offset of the GPIO to lock as IRQ
3858 * This is used directly by GPIO drivers that want to indicate
3859 * that a certain GPIO is no longer used exclusively for IRQ.
3861 void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
3863 struct gpio_desc *desc;
3865 desc = gpiochip_get_desc(chip, offset);
3869 clear_bit(FLAG_USED_AS_IRQ, &desc->flags);
3870 clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
3872 /* If we only had this marking, erase it */
3873 if (desc->label && !strcmp(desc->label, "interrupt"))
3874 desc_set_label(desc, NULL);
3876 EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq);
3878 void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset)
3880 struct gpio_desc *desc = gpiochip_get_desc(chip, offset);
3882 if (!IS_ERR(desc) &&
3883 !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags)))
3884 clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
3886 EXPORT_SYMBOL_GPL(gpiochip_disable_irq);
3888 void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset)
3890 struct gpio_desc *desc = gpiochip_get_desc(chip, offset);
3892 if (!IS_ERR(desc) &&
3893 !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) {
3894 WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags));
3895 set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
3898 EXPORT_SYMBOL_GPL(gpiochip_enable_irq);
3900 bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset)
3902 if (offset >= chip->ngpio)
3905 return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags);
3907 EXPORT_SYMBOL_GPL(gpiochip_line_is_irq);
3909 int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset)
3913 if (!try_module_get(chip->gpiodev->owner))
3916 ret = gpiochip_lock_as_irq(chip, offset);
3918 chip_err(chip, "unable to lock HW IRQ %u for IRQ\n", offset);
3919 module_put(chip->gpiodev->owner);
3924 EXPORT_SYMBOL_GPL(gpiochip_reqres_irq);
3926 void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset)
3928 gpiochip_unlock_as_irq(chip, offset);
3929 module_put(chip->gpiodev->owner);
3931 EXPORT_SYMBOL_GPL(gpiochip_relres_irq);
3933 bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset)
3935 if (offset >= chip->ngpio)
3938 return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags);
3940 EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain);
3942 bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset)
3944 if (offset >= chip->ngpio)
3947 return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags);
3949 EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source);
3951 bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset)
3953 if (offset >= chip->ngpio)
3956 return !test_bit(FLAG_TRANSITORY, &chip->gpiodev->descs[offset].flags);
3958 EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent);
3961 * gpiod_get_raw_value_cansleep() - return a gpio's raw value
3962 * @desc: gpio whose value will be returned
3964 * Return the GPIO's raw value, i.e. the value of the physical line disregarding
3965 * its ACTIVE_LOW status, or negative errno on failure.
3967 * This function is to be called from contexts that can sleep.
3969 int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
3971 might_sleep_if(extra_checks);
3972 VALIDATE_DESC(desc);
3973 return gpiod_get_raw_value_commit(desc);
3975 EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep);
3978 * gpiod_get_value_cansleep() - return a gpio's value
3979 * @desc: gpio whose value will be returned
3981 * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into
3982 * account, or negative errno on failure.
3984 * This function is to be called from contexts that can sleep.
3986 int gpiod_get_value_cansleep(const struct gpio_desc *desc)
3990 might_sleep_if(extra_checks);
3991 VALIDATE_DESC(desc);
3992 value = gpiod_get_raw_value_commit(desc);
3996 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
4001 EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
4004 * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
4005 * @array_size: number of elements in the descriptor array / value bitmap
4006 * @desc_array: array of GPIO descriptors whose values will be read
4007 * @array_info: information on applicability of fast bitmap processing path
4008 * @value_bitmap: bitmap to store the read values
4010 * Read the raw values of the GPIOs, i.e. the values of the physical lines
4011 * without regard for their ACTIVE_LOW status. Return 0 in case of success,
4012 * else an error code.
4014 * This function is to be called from contexts that can sleep.
4016 int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
4017 struct gpio_desc **desc_array,
4018 struct gpio_array *array_info,
4019 unsigned long *value_bitmap)
4021 might_sleep_if(extra_checks);
4024 return gpiod_get_array_value_complex(true, true, array_size,
4025 desc_array, array_info,
4028 EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
4031 * gpiod_get_array_value_cansleep() - read values from an array of GPIOs
4032 * @array_size: number of elements in the descriptor array / value bitmap
4033 * @desc_array: array of GPIO descriptors whose values will be read
4034 * @array_info: information on applicability of fast bitmap processing path
4035 * @value_bitmap: bitmap to store the read values
4037 * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
4038 * into account. Return 0 in case of success, else an error code.
4040 * This function is to be called from contexts that can sleep.
4042 int gpiod_get_array_value_cansleep(unsigned int array_size,
4043 struct gpio_desc **desc_array,
4044 struct gpio_array *array_info,
4045 unsigned long *value_bitmap)
4047 might_sleep_if(extra_checks);
4050 return gpiod_get_array_value_complex(false, true, array_size,
4051 desc_array, array_info,
4054 EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
4057 * gpiod_set_raw_value_cansleep() - assign a gpio's raw value
4058 * @desc: gpio whose value will be assigned
4059 * @value: value to assign
4061 * Set the raw value of the GPIO, i.e. the value of its physical line without
4062 * regard for its ACTIVE_LOW status.
4064 * This function is to be called from contexts that can sleep.
4066 void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
4068 might_sleep_if(extra_checks);
4069 VALIDATE_DESC_VOID(desc);
4070 gpiod_set_raw_value_commit(desc, value);
4072 EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep);
4075 * gpiod_set_value_cansleep() - assign a gpio's value
4076 * @desc: gpio whose value will be assigned
4077 * @value: value to assign
4079 * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
4082 * This function is to be called from contexts that can sleep.
4084 void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
4086 might_sleep_if(extra_checks);
4087 VALIDATE_DESC_VOID(desc);
4088 gpiod_set_value_nocheck(desc, value);
4090 EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
4093 * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
4094 * @array_size: number of elements in the descriptor array / value bitmap
4095 * @desc_array: array of GPIO descriptors whose values will be assigned
4096 * @array_info: information on applicability of fast bitmap processing path
4097 * @value_bitmap: bitmap of values to assign
4099 * Set the raw values of the GPIOs, i.e. the values of the physical lines
4100 * without regard for their ACTIVE_LOW status.
4102 * This function is to be called from contexts that can sleep.
4104 int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
4105 struct gpio_desc **desc_array,
4106 struct gpio_array *array_info,
4107 unsigned long *value_bitmap)
4109 might_sleep_if(extra_checks);
4112 return gpiod_set_array_value_complex(true, true, array_size, desc_array,
4113 array_info, value_bitmap);
4115 EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
4118 * gpiod_add_lookup_tables() - register GPIO device consumers
4119 * @tables: list of tables of consumers to register
4120 * @n: number of tables in the list
4122 void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
4126 mutex_lock(&gpio_lookup_lock);
4128 for (i = 0; i < n; i++)
4129 list_add_tail(&tables[i]->list, &gpio_lookup_list);
4131 mutex_unlock(&gpio_lookup_lock);
4135 * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
4136 * @array_size: number of elements in the descriptor array / value bitmap
4137 * @desc_array: array of GPIO descriptors whose values will be assigned
4138 * @array_info: information on applicability of fast bitmap processing path
4139 * @value_bitmap: bitmap of values to assign
4141 * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
4144 * This function is to be called from contexts that can sleep.
4146 int gpiod_set_array_value_cansleep(unsigned int array_size,
4147 struct gpio_desc **desc_array,
4148 struct gpio_array *array_info,
4149 unsigned long *value_bitmap)
4151 might_sleep_if(extra_checks);
4154 return gpiod_set_array_value_complex(false, true, array_size,
4155 desc_array, array_info,
4158 EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
4161 * gpiod_add_lookup_table() - register GPIO device consumers
4162 * @table: table of consumers to register
4164 void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
4166 mutex_lock(&gpio_lookup_lock);
4168 list_add_tail(&table->list, &gpio_lookup_list);
4170 mutex_unlock(&gpio_lookup_lock);
4172 EXPORT_SYMBOL_GPL(gpiod_add_lookup_table);
4175 * gpiod_remove_lookup_table() - unregister GPIO device consumers
4176 * @table: table of consumers to unregister
4178 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table)
4180 mutex_lock(&gpio_lookup_lock);
4182 list_del(&table->list);
4184 mutex_unlock(&gpio_lookup_lock);
4186 EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table);
4189 * gpiod_add_hogs() - register a set of GPIO hogs from machine code
4190 * @hogs: table of gpio hog entries with a zeroed sentinel at the end
4192 void gpiod_add_hogs(struct gpiod_hog *hogs)
4194 struct gpio_chip *chip;
4195 struct gpiod_hog *hog;
4197 mutex_lock(&gpio_machine_hogs_mutex);
4199 for (hog = &hogs[0]; hog->chip_label; hog++) {
4200 list_add_tail(&hog->list, &gpio_machine_hogs);
4203 * The chip may have been registered earlier, so check if it
4204 * exists and, if so, try to hog the line now.
4206 chip = find_chip_by_name(hog->chip_label);
4208 gpiochip_machine_hog(chip, hog);
4211 mutex_unlock(&gpio_machine_hogs_mutex);
4213 EXPORT_SYMBOL_GPL(gpiod_add_hogs);
4215 static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev)
4217 const char *dev_id = dev ? dev_name(dev) : NULL;
4218 struct gpiod_lookup_table *table;
4220 mutex_lock(&gpio_lookup_lock);
4222 list_for_each_entry(table, &gpio_lookup_list, list) {
4223 if (table->dev_id && dev_id) {
4225 * Valid strings on both ends, must be identical to have
4228 if (!strcmp(table->dev_id, dev_id))
4232 * One of the pointers is NULL, so both must be to have
4235 if (dev_id == table->dev_id)
4242 mutex_unlock(&gpio_lookup_lock);
4246 static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
4247 unsigned int idx, unsigned long *flags)
4249 struct gpio_desc *desc = ERR_PTR(-ENOENT);
4250 struct gpiod_lookup_table *table;
4251 struct gpiod_lookup *p;
4253 table = gpiod_find_lookup_table(dev);
4257 for (p = &table->table[0]; p->chip_label; p++) {
4258 struct gpio_chip *chip;
4260 /* idx must always match exactly */
4264 /* If the lookup entry has a con_id, require exact match */
4265 if (p->con_id && (!con_id || strcmp(p->con_id, con_id)))
4268 chip = find_chip_by_name(p->chip_label);
4272 * As the lookup table indicates a chip with
4273 * p->chip_label should exist, assume it may
4274 * still appear later and let the interested
4275 * consumer be probed again or let the Deferred
4276 * Probe infrastructure handle the error.
4278 dev_warn(dev, "cannot find GPIO chip %s, deferring\n",
4280 return ERR_PTR(-EPROBE_DEFER);
4283 if (chip->ngpio <= p->chip_hwnum) {
4285 "requested GPIO %d is out of range [0..%d] for chip %s\n",
4286 idx, chip->ngpio, chip->label);
4287 return ERR_PTR(-EINVAL);
4290 desc = gpiochip_get_desc(chip, p->chip_hwnum);
4299 static int platform_gpio_count(struct device *dev, const char *con_id)
4301 struct gpiod_lookup_table *table;
4302 struct gpiod_lookup *p;
4303 unsigned int count = 0;
4305 table = gpiod_find_lookup_table(dev);
4309 for (p = &table->table[0]; p->chip_label; p++) {
4310 if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) ||
4311 (!con_id && !p->con_id))
4321 * gpiod_count - return the number of GPIOs associated with a device / function
4322 * or -ENOENT if no GPIO has been assigned to the requested function
4323 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4324 * @con_id: function within the GPIO consumer
4326 int gpiod_count(struct device *dev, const char *con_id)
4328 int count = -ENOENT;
4330 if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
4331 count = of_gpio_get_count(dev, con_id);
4332 else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev))
4333 count = acpi_gpio_count(dev, con_id);
4336 count = platform_gpio_count(dev, con_id);
4340 EXPORT_SYMBOL_GPL(gpiod_count);
4343 * gpiod_get - obtain a GPIO for a given GPIO function
4344 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4345 * @con_id: function within the GPIO consumer
4346 * @flags: optional GPIO initialization flags
4348 * Return the GPIO descriptor corresponding to the function con_id of device
4349 * dev, -ENOENT if no GPIO has been assigned to the requested function, or
4350 * another IS_ERR() code if an error occurred while trying to acquire the GPIO.
4352 struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id,
4353 enum gpiod_flags flags)
4355 return gpiod_get_index(dev, con_id, 0, flags);
4357 EXPORT_SYMBOL_GPL(gpiod_get);
4360 * gpiod_get_optional - obtain an optional GPIO for a given GPIO function
4361 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4362 * @con_id: function within the GPIO consumer
4363 * @flags: optional GPIO initialization flags
4365 * This is equivalent to gpiod_get(), except that when no GPIO was assigned to
4366 * the requested function it will return NULL. This is convenient for drivers
4367 * that need to handle optional GPIOs.
4369 struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
4371 enum gpiod_flags flags)
4373 return gpiod_get_index_optional(dev, con_id, 0, flags);
4375 EXPORT_SYMBOL_GPL(gpiod_get_optional);
4379 * gpiod_configure_flags - helper function to configure a given GPIO
4380 * @desc: gpio whose value will be assigned
4381 * @con_id: function within the GPIO consumer
4382 * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from
4383 * of_find_gpio() or of_get_gpio_hog()
4384 * @dflags: gpiod_flags - optional GPIO initialization flags
4386 * Return 0 on success, -ENOENT if no GPIO has been assigned to the
4387 * requested function and/or index, or another IS_ERR() code if an error
4388 * occurred while trying to acquire the GPIO.
4390 int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
4391 unsigned long lflags, enum gpiod_flags dflags)
4395 if (lflags & GPIO_ACTIVE_LOW)
4396 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
4398 if (lflags & GPIO_OPEN_DRAIN)
4399 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
4400 else if (dflags & GPIOD_FLAGS_BIT_OPEN_DRAIN) {
4402 * This enforces open drain mode from the consumer side.
4403 * This is necessary for some busses like I2C, but the lookup
4404 * should *REALLY* have specified them as open drain in the
4405 * first place, so print a little warning here.
4407 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
4409 "enforced open drain please flag it properly in DT/ACPI DSDT/board file\n");
4412 if (lflags & GPIO_OPEN_SOURCE)
4413 set_bit(FLAG_OPEN_SOURCE, &desc->flags);
4415 if ((lflags & GPIO_PULL_UP) && (lflags & GPIO_PULL_DOWN)) {
4417 "both pull-up and pull-down enabled, invalid configuration\n");
4421 if (lflags & GPIO_PULL_UP)
4422 set_bit(FLAG_PULL_UP, &desc->flags);
4423 else if (lflags & GPIO_PULL_DOWN)
4424 set_bit(FLAG_PULL_DOWN, &desc->flags);
4426 ret = gpiod_set_transitory(desc, (lflags & GPIO_TRANSITORY));
4430 /* No particular flag request, return here... */
4431 if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) {
4432 pr_debug("no flags found for %s\n", con_id);
4437 if (dflags & GPIOD_FLAGS_BIT_DIR_OUT)
4438 ret = gpiod_direction_output(desc,
4439 !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL));
4441 ret = gpiod_direction_input(desc);
4447 * gpiod_get_index - obtain a GPIO from a multi-index GPIO function
4448 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4449 * @con_id: function within the GPIO consumer
4450 * @idx: index of the GPIO to obtain in the consumer
4451 * @flags: optional GPIO initialization flags
4453 * This variant of gpiod_get() allows to access GPIOs other than the first
4454 * defined one for functions that define several GPIOs.
4456 * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the
4457 * requested function and/or index, or another IS_ERR() code if an error
4458 * occurred while trying to acquire the GPIO.
4460 struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
4463 enum gpiod_flags flags)
4465 unsigned long lookupflags = GPIO_LOOKUP_FLAGS_DEFAULT;
4466 struct gpio_desc *desc = NULL;
4468 /* Maybe we have a device name, maybe not */
4469 const char *devname = dev ? dev_name(dev) : "?";
4471 dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id);
4474 /* Using device tree? */
4475 if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
4476 dev_dbg(dev, "using device tree for GPIO lookup\n");
4477 desc = of_find_gpio(dev, con_id, idx, &lookupflags);
4478 } else if (ACPI_COMPANION(dev)) {
4479 dev_dbg(dev, "using ACPI for GPIO lookup\n");
4480 desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags);
4485 * Either we are not using DT or ACPI, or their lookup did not return
4486 * a result. In that case, use platform lookup as a fallback.
4488 if (!desc || desc == ERR_PTR(-ENOENT)) {
4489 dev_dbg(dev, "using lookup tables for GPIO lookup\n");
4490 desc = gpiod_find(dev, con_id, idx, &lookupflags);
4494 dev_dbg(dev, "No GPIO consumer %s found\n", con_id);
4499 * If a connection label was passed use that, else attempt to use
4500 * the device name as label
4502 ret = gpiod_request(desc, con_id ? con_id : devname);
4504 if (ret == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
4506 * This happens when there are several consumers for
4507 * the same GPIO line: we just return here without
4508 * further initialization. It is a bit if a hack.
4509 * This is necessary to support fixed regulators.
4511 * FIXME: Make this more sane and safe.
4513 dev_info(dev, "nonexclusive access to GPIO for %s\n",
4514 con_id ? con_id : devname);
4517 return ERR_PTR(ret);
4521 ret = gpiod_configure_flags(desc, con_id, lookupflags, flags);
4523 dev_dbg(dev, "setup of GPIO %s failed\n", con_id);
4525 return ERR_PTR(ret);
4530 EXPORT_SYMBOL_GPL(gpiod_get_index);
4533 * fwnode_get_named_gpiod - obtain a GPIO from firmware node
4534 * @fwnode: handle of the firmware node
4535 * @propname: name of the firmware property representing the GPIO
4536 * @index: index of the GPIO to obtain for the consumer
4537 * @dflags: GPIO initialization flags
4538 * @label: label to attach to the requested GPIO
4540 * This function can be used for drivers that get their configuration
4541 * from opaque firmware.
4543 * The function properly finds the corresponding GPIO using whatever is the
4544 * underlying firmware interface and then makes sure that the GPIO
4545 * descriptor is requested before it is returned to the caller.
4548 * On successful request the GPIO pin is configured in accordance with
4551 * In case of error an ERR_PTR() is returned.
4553 struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
4554 const char *propname, int index,
4555 enum gpiod_flags dflags,
4558 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
4559 struct gpio_desc *desc = ERR_PTR(-ENODEV);
4563 return ERR_PTR(-EINVAL);
4565 if (is_of_node(fwnode)) {
4566 desc = gpiod_get_from_of_node(to_of_node(fwnode),
4571 } else if (is_acpi_node(fwnode)) {
4572 struct acpi_gpio_info info;
4574 desc = acpi_node_get_gpiod(fwnode, propname, index, &info);
4578 acpi_gpio_update_gpiod_flags(&dflags, &info);
4579 acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
4582 /* Currently only ACPI takes this path */
4583 ret = gpiod_request(desc, label);
4585 return ERR_PTR(ret);
4587 ret = gpiod_configure_flags(desc, propname, lflags, dflags);
4590 return ERR_PTR(ret);
4595 EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod);
4598 * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO
4600 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4601 * @con_id: function within the GPIO consumer
4602 * @index: index of the GPIO to obtain in the consumer
4603 * @flags: optional GPIO initialization flags
4605 * This is equivalent to gpiod_get_index(), except that when no GPIO with the
4606 * specified index was assigned to the requested function it will return NULL.
4607 * This is convenient for drivers that need to handle optional GPIOs.
4609 struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
4612 enum gpiod_flags flags)
4614 struct gpio_desc *desc;
4616 desc = gpiod_get_index(dev, con_id, index, flags);
4618 if (PTR_ERR(desc) == -ENOENT)
4624 EXPORT_SYMBOL_GPL(gpiod_get_index_optional);
4627 * gpiod_hog - Hog the specified GPIO desc given the provided flags
4628 * @desc: gpio whose value will be assigned
4629 * @name: gpio line name
4630 * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from
4631 * of_find_gpio() or of_get_gpio_hog()
4632 * @dflags: gpiod_flags - optional GPIO initialization flags
4634 int gpiod_hog(struct gpio_desc *desc, const char *name,
4635 unsigned long lflags, enum gpiod_flags dflags)
4637 struct gpio_chip *chip;
4638 struct gpio_desc *local_desc;
4642 chip = gpiod_to_chip(desc);
4643 hwnum = gpio_chip_hwgpio(desc);
4645 local_desc = gpiochip_request_own_desc(chip, hwnum, name,
4647 if (IS_ERR(local_desc)) {
4648 ret = PTR_ERR(local_desc);
4649 pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n",
4650 name, chip->label, hwnum, ret);
4654 /* Mark GPIO as hogged so it can be identified and removed later */
4655 set_bit(FLAG_IS_HOGGED, &desc->flags);
4657 pr_info("GPIO line %d (%s) hogged as %s%s\n",
4658 desc_to_gpio(desc), name,
4659 (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input",
4660 (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ?
4661 (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":"");
4667 * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog
4668 * @chip: gpio chip to act on
4670 static void gpiochip_free_hogs(struct gpio_chip *chip)
4674 for (id = 0; id < chip->ngpio; id++) {
4675 if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags))
4676 gpiochip_free_own_desc(&chip->gpiodev->descs[id]);
4681 * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function
4682 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4683 * @con_id: function within the GPIO consumer
4684 * @flags: optional GPIO initialization flags
4686 * This function acquires all the GPIOs defined under a given function.
4688 * Return a struct gpio_descs containing an array of descriptors, -ENOENT if
4689 * no GPIO has been assigned to the requested function, or another IS_ERR()
4690 * code if an error occurred while trying to acquire the GPIOs.
4692 struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
4694 enum gpiod_flags flags)
4696 struct gpio_desc *desc;
4697 struct gpio_descs *descs;
4698 struct gpio_array *array_info = NULL;
4699 struct gpio_chip *chip;
4700 int count, bitmap_size;
4702 count = gpiod_count(dev, con_id);
4704 return ERR_PTR(count);
4706 descs = kzalloc(struct_size(descs, desc, count), GFP_KERNEL);
4708 return ERR_PTR(-ENOMEM);
4710 for (descs->ndescs = 0; descs->ndescs < count; ) {
4711 desc = gpiod_get_index(dev, con_id, descs->ndescs, flags);
4713 gpiod_put_array(descs);
4714 return ERR_CAST(desc);
4717 descs->desc[descs->ndescs] = desc;
4719 chip = gpiod_to_chip(desc);
4721 * If pin hardware number of array member 0 is also 0, select
4722 * its chip as a candidate for fast bitmap processing path.
4724 if (descs->ndescs == 0 && gpio_chip_hwgpio(desc) == 0) {
4725 struct gpio_descs *array;
4727 bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
4728 chip->ngpio : count);
4730 array = kzalloc(struct_size(descs, desc, count) +
4731 struct_size(array_info, invert_mask,
4732 3 * bitmap_size), GFP_KERNEL);
4734 gpiod_put_array(descs);
4735 return ERR_PTR(-ENOMEM);
4738 memcpy(array, descs,
4739 struct_size(descs, desc, descs->ndescs + 1));
4743 array_info = (void *)(descs->desc + count);
4744 array_info->get_mask = array_info->invert_mask +
4746 array_info->set_mask = array_info->get_mask +
4749 array_info->desc = descs->desc;
4750 array_info->size = count;
4751 array_info->chip = chip;
4752 bitmap_set(array_info->get_mask, descs->ndescs,
4753 count - descs->ndescs);
4754 bitmap_set(array_info->set_mask, descs->ndescs,
4755 count - descs->ndescs);
4756 descs->info = array_info;
4758 /* Unmark array members which don't belong to the 'fast' chip */
4759 if (array_info && array_info->chip != chip) {
4760 __clear_bit(descs->ndescs, array_info->get_mask);
4761 __clear_bit(descs->ndescs, array_info->set_mask);
4764 * Detect array members which belong to the 'fast' chip
4765 * but their pins are not in hardware order.
4767 else if (array_info &&
4768 gpio_chip_hwgpio(desc) != descs->ndescs) {
4770 * Don't use fast path if all array members processed so
4771 * far belong to the same chip as this one but its pin
4772 * hardware number is different from its array index.
4774 if (bitmap_full(array_info->get_mask, descs->ndescs)) {
4777 __clear_bit(descs->ndescs,
4778 array_info->get_mask);
4779 __clear_bit(descs->ndescs,
4780 array_info->set_mask);
4782 } else if (array_info) {
4783 /* Exclude open drain or open source from fast output */
4784 if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
4785 gpiochip_line_is_open_source(chip, descs->ndescs))
4786 __clear_bit(descs->ndescs,
4787 array_info->set_mask);
4788 /* Identify 'fast' pins which require invertion */
4789 if (gpiod_is_active_low(desc))
4790 __set_bit(descs->ndescs,
4791 array_info->invert_mask);
4798 "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n",
4799 array_info->chip->label, array_info->size,
4800 *array_info->get_mask, *array_info->set_mask,
4801 *array_info->invert_mask);
4804 EXPORT_SYMBOL_GPL(gpiod_get_array);
4807 * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO
4809 * @dev: GPIO consumer, can be NULL for system-global GPIOs
4810 * @con_id: function within the GPIO consumer
4811 * @flags: optional GPIO initialization flags
4813 * This is equivalent to gpiod_get_array(), except that when no GPIO was
4814 * assigned to the requested function it will return NULL.
4816 struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev,
4818 enum gpiod_flags flags)
4820 struct gpio_descs *descs;
4822 descs = gpiod_get_array(dev, con_id, flags);
4823 if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT))
4828 EXPORT_SYMBOL_GPL(gpiod_get_array_optional);
4831 * gpiod_put - dispose of a GPIO descriptor
4832 * @desc: GPIO descriptor to dispose of
4834 * No descriptor can be used after gpiod_put() has been called on it.
4836 void gpiod_put(struct gpio_desc *desc)
4841 EXPORT_SYMBOL_GPL(gpiod_put);
4844 * gpiod_put_array - dispose of multiple GPIO descriptors
4845 * @descs: struct gpio_descs containing an array of descriptors
4847 void gpiod_put_array(struct gpio_descs *descs)
4851 for (i = 0; i < descs->ndescs; i++)
4852 gpiod_put(descs->desc[i]);
4856 EXPORT_SYMBOL_GPL(gpiod_put_array);
4858 static int __init gpiolib_dev_init(void)
4862 /* Register GPIO sysfs bus */
4863 ret = bus_register(&gpio_bus_type);
4865 pr_err("gpiolib: could not register GPIO bus type\n");
4869 ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip");
4871 pr_err("gpiolib: failed to allocate char dev region\n");
4872 bus_unregister(&gpio_bus_type);
4874 gpiolib_initialized = true;
4875 gpiochip_setup_devs();
4879 core_initcall(gpiolib_dev_init);
4881 #ifdef CONFIG_DEBUG_FS
4883 static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
4886 struct gpio_chip *chip = gdev->chip;
4887 unsigned gpio = gdev->base;
4888 struct gpio_desc *gdesc = &gdev->descs[0];
4893 for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) {
4894 if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) {
4896 seq_printf(s, " gpio-%-3d (%-20.20s)\n",
4902 gpiod_get_direction(gdesc);
4903 is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
4904 is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
4905 active_low = test_bit(FLAG_ACTIVE_LOW, &gdesc->flags);
4906 seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s",
4907 gpio, gdesc->name ? gdesc->name : "", gdesc->label,
4908 is_out ? "out" : "in ",
4909 chip->get ? (chip->get(chip, i) ? "hi" : "lo") : "? ",
4910 is_irq ? "IRQ " : "",
4911 active_low ? "ACTIVE LOW" : "");
4912 seq_printf(s, "\n");
4916 static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos)
4918 unsigned long flags;
4919 struct gpio_device *gdev = NULL;
4920 loff_t index = *pos;
4924 spin_lock_irqsave(&gpio_lock, flags);
4925 list_for_each_entry(gdev, &gpio_devices, list)
4927 spin_unlock_irqrestore(&gpio_lock, flags);
4930 spin_unlock_irqrestore(&gpio_lock, flags);
4935 static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos)
4937 unsigned long flags;
4938 struct gpio_device *gdev = v;
4941 spin_lock_irqsave(&gpio_lock, flags);
4942 if (list_is_last(&gdev->list, &gpio_devices))
4945 ret = list_entry(gdev->list.next, struct gpio_device, list);
4946 spin_unlock_irqrestore(&gpio_lock, flags);
4954 static void gpiolib_seq_stop(struct seq_file *s, void *v)
4958 static int gpiolib_seq_show(struct seq_file *s, void *v)
4960 struct gpio_device *gdev = v;
4961 struct gpio_chip *chip = gdev->chip;
4962 struct device *parent;
4965 seq_printf(s, "%s%s: (dangling chip)", (char *)s->private,
4966 dev_name(&gdev->dev));
4970 seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private,
4971 dev_name(&gdev->dev),
4972 gdev->base, gdev->base + gdev->ngpio - 1);
4973 parent = chip->parent;
4975 seq_printf(s, ", parent: %s/%s",
4976 parent->bus ? parent->bus->name : "no-bus",
4979 seq_printf(s, ", %s", chip->label);
4980 if (chip->can_sleep)
4981 seq_printf(s, ", can sleep");
4982 seq_printf(s, ":\n");
4985 chip->dbg_show(s, chip);
4987 gpiolib_dbg_show(s, gdev);
4992 static const struct seq_operations gpiolib_seq_ops = {
4993 .start = gpiolib_seq_start,
4994 .next = gpiolib_seq_next,
4995 .stop = gpiolib_seq_stop,
4996 .show = gpiolib_seq_show,
4999 static int gpiolib_open(struct inode *inode, struct file *file)
5001 return seq_open(file, &gpiolib_seq_ops);
5004 static const struct file_operations gpiolib_operations = {
5005 .owner = THIS_MODULE,
5006 .open = gpiolib_open,
5008 .llseek = seq_lseek,
5009 .release = seq_release,
5012 static int __init gpiolib_debugfs_init(void)
5014 /* /sys/kernel/debug/gpio */
5015 debugfs_create_file("gpio", S_IFREG | S_IRUGO, NULL, NULL,
5016 &gpiolib_operations);
5019 subsys_initcall(gpiolib_debugfs_init);
5021 #endif /* DEBUG_FS */