c1c4048ee37d4c979e35267901b6c52d9296a892
[sfrench/cifs-2.6.git] / drivers / bluetooth / hci_bcm.c
1 /*
2  *
3  *  Bluetooth HCI UART driver for Broadcom devices
4  *
5  *  Copyright (C) 2015  Intel Corporation
6  *
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  *
22  */
23
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/skbuff.h>
27 #include <linux/firmware.h>
28 #include <linux/module.h>
29 #include <linux/acpi.h>
30 #include <linux/platform_device.h>
31 #include <linux/clk.h>
32 #include <linux/gpio/consumer.h>
33 #include <linux/tty.h>
34 #include <linux/interrupt.h>
35 #include <linux/dmi.h>
36 #include <linux/pm_runtime.h>
37
38 #include <net/bluetooth/bluetooth.h>
39 #include <net/bluetooth/hci_core.h>
40
41 #include "btbcm.h"
42 #include "hci_uart.h"
43
44 #define BCM_LM_DIAG_PKT 0x07
45 #define BCM_LM_DIAG_SIZE 63
46
47 #define BCM_AUTOSUSPEND_DELAY   5000 /* default autosleep delay */
48
49 struct bcm_device {
50         struct list_head        list;
51
52         struct platform_device  *pdev;
53
54         const char              *name;
55         struct gpio_desc        *device_wakeup;
56         struct gpio_desc        *shutdown;
57
58         struct clk              *clk;
59         bool                    clk_enabled;
60
61         u32                     init_speed;
62         int                     irq;
63         u8                      irq_polarity;
64
65 #ifdef CONFIG_PM
66         struct hci_uart         *hu;
67         bool                    is_suspended; /* suspend/resume flag */
68 #endif
69 };
70
71 struct bcm_data {
72         struct sk_buff          *rx_skb;
73         struct sk_buff_head     txq;
74
75         struct bcm_device       *dev;
76 };
77
78 /* List of BCM BT UART devices */
79 static DEFINE_MUTEX(bcm_device_lock);
80 static LIST_HEAD(bcm_device_list);
81
82 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
83 {
84         struct hci_dev *hdev = hu->hdev;
85         struct sk_buff *skb;
86         struct bcm_update_uart_baud_rate param;
87
88         if (speed > 3000000) {
89                 struct bcm_write_uart_clock_setting clock;
90
91                 clock.type = BCM_UART_CLOCK_48MHZ;
92
93                 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
94
95                 /* This Broadcom specific command changes the UART's controller
96                  * clock for baud rate > 3000000.
97                  */
98                 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
99                 if (IS_ERR(skb)) {
100                         int err = PTR_ERR(skb);
101                         bt_dev_err(hdev, "BCM: failed to write clock (%d)",
102                                    err);
103                         return err;
104                 }
105
106                 kfree_skb(skb);
107         }
108
109         bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
110
111         param.zero = cpu_to_le16(0);
112         param.baud_rate = cpu_to_le32(speed);
113
114         /* This Broadcom specific command changes the UART's controller baud
115          * rate.
116          */
117         skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
118                              HCI_INIT_TIMEOUT);
119         if (IS_ERR(skb)) {
120                 int err = PTR_ERR(skb);
121                 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
122                            err);
123                 return err;
124         }
125
126         kfree_skb(skb);
127
128         return 0;
129 }
130
131 /* bcm_device_exists should be protected by bcm_device_lock */
132 static bool bcm_device_exists(struct bcm_device *device)
133 {
134         struct list_head *p;
135
136         list_for_each(p, &bcm_device_list) {
137                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
138
139                 if (device == dev)
140                         return true;
141         }
142
143         return false;
144 }
145
146 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
147 {
148         if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
149                 clk_prepare_enable(dev->clk);
150
151         gpiod_set_value(dev->shutdown, powered);
152         gpiod_set_value(dev->device_wakeup, powered);
153
154         if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
155                 clk_disable_unprepare(dev->clk);
156
157         dev->clk_enabled = powered;
158
159         return 0;
160 }
161
162 #ifdef CONFIG_PM
163 static irqreturn_t bcm_host_wake(int irq, void *data)
164 {
165         struct bcm_device *bdev = data;
166
167         bt_dev_dbg(bdev, "Host wake IRQ");
168
169         pm_runtime_get(&bdev->pdev->dev);
170         pm_runtime_mark_last_busy(&bdev->pdev->dev);
171         pm_runtime_put_autosuspend(&bdev->pdev->dev);
172
173         return IRQ_HANDLED;
174 }
175
176 static int bcm_request_irq(struct bcm_data *bcm)
177 {
178         struct bcm_device *bdev = bcm->dev;
179         int err = 0;
180
181         /* If this is not a platform device, do not enable PM functionalities */
182         mutex_lock(&bcm_device_lock);
183         if (!bcm_device_exists(bdev)) {
184                 err = -ENODEV;
185                 goto unlock;
186         }
187
188         if (bdev->irq > 0) {
189                 err = devm_request_irq(&bdev->pdev->dev, bdev->irq,
190                                        bcm_host_wake, IRQF_TRIGGER_RISING,
191                                        "host_wake", bdev);
192                 if (err)
193                         goto unlock;
194
195                 device_init_wakeup(&bdev->pdev->dev, true);
196
197                 pm_runtime_set_autosuspend_delay(&bdev->pdev->dev,
198                                                  BCM_AUTOSUSPEND_DELAY);
199                 pm_runtime_use_autosuspend(&bdev->pdev->dev);
200                 pm_runtime_set_active(&bdev->pdev->dev);
201                 pm_runtime_enable(&bdev->pdev->dev);
202         }
203
204 unlock:
205         mutex_unlock(&bcm_device_lock);
206
207         return err;
208 }
209
210 static const struct bcm_set_sleep_mode default_sleep_params = {
211         .sleep_mode = 1,        /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
212         .idle_host = 2,         /* idle threshold HOST, in 300ms */
213         .idle_dev = 2,          /* idle threshold device, in 300ms */
214         .bt_wake_active = 1,    /* BT_WAKE active mode: 1 = high, 0 = low */
215         .host_wake_active = 0,  /* HOST_WAKE active mode: 1 = high, 0 = low */
216         .allow_host_sleep = 1,  /* Allow host sleep in SCO flag */
217         .combine_modes = 1,     /* Combine sleep and LPM flag */
218         .tristate_control = 0,  /* Allow tri-state control of UART tx flag */
219         /* Irrelevant USB flags */
220         .usb_auto_sleep = 0,
221         .usb_resume_timeout = 0,
222         .pulsed_host_wake = 0,
223         .break_to_host = 0
224 };
225
226 static int bcm_setup_sleep(struct hci_uart *hu)
227 {
228         struct bcm_data *bcm = hu->priv;
229         struct sk_buff *skb;
230         struct bcm_set_sleep_mode sleep_params = default_sleep_params;
231
232         sleep_params.host_wake_active = !bcm->dev->irq_polarity;
233
234         skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
235                              &sleep_params, HCI_INIT_TIMEOUT);
236         if (IS_ERR(skb)) {
237                 int err = PTR_ERR(skb);
238                 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
239                 return err;
240         }
241         kfree_skb(skb);
242
243         bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
244
245         return 0;
246 }
247 #else
248 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
249 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
250 #endif
251
252 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
253 {
254         struct hci_uart *hu = hci_get_drvdata(hdev);
255         struct bcm_data *bcm = hu->priv;
256         struct sk_buff *skb;
257
258         if (!test_bit(HCI_RUNNING, &hdev->flags))
259                 return -ENETDOWN;
260
261         skb = bt_skb_alloc(3, GFP_KERNEL);
262         if (!skb)
263                 return -ENOMEM;
264
265         *(u8 *)skb_put(skb, 1) = BCM_LM_DIAG_PKT;
266         *(u8 *)skb_put(skb, 1) = 0xf0;
267         *(u8 *)skb_put(skb, 1) = enable;
268
269         skb_queue_tail(&bcm->txq, skb);
270         hci_uart_tx_wakeup(hu);
271
272         return 0;
273 }
274
275 static int bcm_open(struct hci_uart *hu)
276 {
277         struct bcm_data *bcm;
278         struct list_head *p;
279
280         bt_dev_dbg(hu->hdev, "hu %p", hu);
281
282         bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
283         if (!bcm)
284                 return -ENOMEM;
285
286         skb_queue_head_init(&bcm->txq);
287
288         hu->priv = bcm;
289
290         if (!hu->tty->dev)
291                 goto out;
292
293         mutex_lock(&bcm_device_lock);
294         list_for_each(p, &bcm_device_list) {
295                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
296
297                 /* Retrieve saved bcm_device based on parent of the
298                  * platform device (saved during device probe) and
299                  * parent of tty device used by hci_uart
300                  */
301                 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
302                         bcm->dev = dev;
303                         hu->init_speed = dev->init_speed;
304 #ifdef CONFIG_PM
305                         dev->hu = hu;
306 #endif
307                         bcm_gpio_set_power(bcm->dev, true);
308                         break;
309                 }
310         }
311
312         mutex_unlock(&bcm_device_lock);
313 out:
314         return 0;
315 }
316
317 static int bcm_close(struct hci_uart *hu)
318 {
319         struct bcm_data *bcm = hu->priv;
320         struct bcm_device *bdev = bcm->dev;
321
322         bt_dev_dbg(hu->hdev, "hu %p", hu);
323
324         /* Protect bcm->dev against removal of the device or driver */
325         mutex_lock(&bcm_device_lock);
326         if (bcm_device_exists(bdev)) {
327                 bcm_gpio_set_power(bdev, false);
328 #ifdef CONFIG_PM
329                 pm_runtime_disable(&bdev->pdev->dev);
330                 pm_runtime_set_suspended(&bdev->pdev->dev);
331
332                 if (device_can_wakeup(&bdev->pdev->dev)) {
333                         devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
334                         device_init_wakeup(&bdev->pdev->dev, false);
335                 }
336
337                 bdev->hu = NULL;
338 #endif
339         }
340         mutex_unlock(&bcm_device_lock);
341
342         skb_queue_purge(&bcm->txq);
343         kfree_skb(bcm->rx_skb);
344         kfree(bcm);
345
346         hu->priv = NULL;
347         return 0;
348 }
349
350 static int bcm_flush(struct hci_uart *hu)
351 {
352         struct bcm_data *bcm = hu->priv;
353
354         bt_dev_dbg(hu->hdev, "hu %p", hu);
355
356         skb_queue_purge(&bcm->txq);
357
358         return 0;
359 }
360
361 static int bcm_setup(struct hci_uart *hu)
362 {
363         struct bcm_data *bcm = hu->priv;
364         char fw_name[64];
365         const struct firmware *fw;
366         unsigned int speed;
367         int err;
368
369         bt_dev_dbg(hu->hdev, "hu %p", hu);
370
371         hu->hdev->set_diag = bcm_set_diag;
372         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
373
374         err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
375         if (err)
376                 return err;
377
378         err = request_firmware(&fw, fw_name, &hu->hdev->dev);
379         if (err < 0) {
380                 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
381                 return 0;
382         }
383
384         err = btbcm_patchram(hu->hdev, fw);
385         if (err) {
386                 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
387                 goto finalize;
388         }
389
390         /* Init speed if any */
391         if (hu->init_speed)
392                 speed = hu->init_speed;
393         else if (hu->proto->init_speed)
394                 speed = hu->proto->init_speed;
395         else
396                 speed = 0;
397
398         if (speed)
399                 hci_uart_set_baudrate(hu, speed);
400
401         /* Operational speed if any */
402         if (hu->oper_speed)
403                 speed = hu->oper_speed;
404         else if (hu->proto->oper_speed)
405                 speed = hu->proto->oper_speed;
406         else
407                 speed = 0;
408
409         if (speed) {
410                 err = bcm_set_baudrate(hu, speed);
411                 if (!err)
412                         hci_uart_set_baudrate(hu, speed);
413         }
414
415 finalize:
416         release_firmware(fw);
417
418         err = btbcm_finalize(hu->hdev);
419         if (err)
420                 return err;
421
422         err = bcm_request_irq(bcm);
423         if (!err)
424                 err = bcm_setup_sleep(hu);
425
426         return err;
427 }
428
429 #define BCM_RECV_LM_DIAG \
430         .type = BCM_LM_DIAG_PKT, \
431         .hlen = BCM_LM_DIAG_SIZE, \
432         .loff = 0, \
433         .lsize = 0, \
434         .maxlen = BCM_LM_DIAG_SIZE
435
436 static const struct h4_recv_pkt bcm_recv_pkts[] = {
437         { H4_RECV_ACL,      .recv = hci_recv_frame },
438         { H4_RECV_SCO,      .recv = hci_recv_frame },
439         { H4_RECV_EVENT,    .recv = hci_recv_frame },
440         { BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
441 };
442
443 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
444 {
445         struct bcm_data *bcm = hu->priv;
446
447         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
448                 return -EUNATCH;
449
450         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
451                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
452         if (IS_ERR(bcm->rx_skb)) {
453                 int err = PTR_ERR(bcm->rx_skb);
454                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
455                 bcm->rx_skb = NULL;
456                 return err;
457         } else if (!bcm->rx_skb) {
458                 /* Delay auto-suspend when receiving completed packet */
459                 mutex_lock(&bcm_device_lock);
460                 if (bcm->dev && bcm_device_exists(bcm->dev)) {
461                         pm_runtime_get(&bcm->dev->pdev->dev);
462                         pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
463                         pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
464                 }
465                 mutex_unlock(&bcm_device_lock);
466         }
467
468         return count;
469 }
470
471 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
472 {
473         struct bcm_data *bcm = hu->priv;
474
475         bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
476
477         /* Prepend skb with frame type */
478         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
479         skb_queue_tail(&bcm->txq, skb);
480
481         return 0;
482 }
483
484 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
485 {
486         struct bcm_data *bcm = hu->priv;
487         struct sk_buff *skb = NULL;
488         struct bcm_device *bdev = NULL;
489
490         mutex_lock(&bcm_device_lock);
491
492         if (bcm_device_exists(bcm->dev)) {
493                 bdev = bcm->dev;
494                 pm_runtime_get_sync(&bdev->pdev->dev);
495                 /* Shall be resumed here */
496         }
497
498         skb = skb_dequeue(&bcm->txq);
499
500         if (bdev) {
501                 pm_runtime_mark_last_busy(&bdev->pdev->dev);
502                 pm_runtime_put_autosuspend(&bdev->pdev->dev);
503         }
504
505         mutex_unlock(&bcm_device_lock);
506
507         return skb;
508 }
509
510 #ifdef CONFIG_PM
511 static int bcm_suspend_device(struct device *dev)
512 {
513         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
514
515         bt_dev_dbg(bdev, "");
516
517         if (!bdev->is_suspended && bdev->hu) {
518                 hci_uart_set_flow_control(bdev->hu, true);
519
520                 /* Once this returns, driver suspends BT via GPIO */
521                 bdev->is_suspended = true;
522         }
523
524         /* Suspend the device */
525         if (bdev->device_wakeup) {
526                 gpiod_set_value(bdev->device_wakeup, false);
527                 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
528                 mdelay(15);
529         }
530
531         return 0;
532 }
533
534 static int bcm_resume_device(struct device *dev)
535 {
536         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
537
538         bt_dev_dbg(bdev, "");
539
540         if (bdev->device_wakeup) {
541                 gpiod_set_value(bdev->device_wakeup, true);
542                 bt_dev_dbg(bdev, "resume, delaying 15 ms");
543                 mdelay(15);
544         }
545
546         /* When this executes, the device has woken up already */
547         if (bdev->is_suspended && bdev->hu) {
548                 bdev->is_suspended = false;
549
550                 hci_uart_set_flow_control(bdev->hu, false);
551         }
552
553         return 0;
554 }
555 #endif
556
557 #ifdef CONFIG_PM_SLEEP
558 /* Platform suspend callback */
559 static int bcm_suspend(struct device *dev)
560 {
561         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
562         int error;
563
564         bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
565
566         /* bcm_suspend can be called at any time as long as platform device is
567          * bound, so it should use bcm_device_lock to protect access to hci_uart
568          * and device_wake-up GPIO.
569          */
570         mutex_lock(&bcm_device_lock);
571
572         if (!bdev->hu)
573                 goto unlock;
574
575         if (pm_runtime_active(dev))
576                 bcm_suspend_device(dev);
577
578         if (device_may_wakeup(&bdev->pdev->dev)) {
579                 error = enable_irq_wake(bdev->irq);
580                 if (!error)
581                         bt_dev_dbg(bdev, "BCM irq: enabled");
582         }
583
584 unlock:
585         mutex_unlock(&bcm_device_lock);
586
587         return 0;
588 }
589
590 /* Platform resume callback */
591 static int bcm_resume(struct device *dev)
592 {
593         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
594
595         bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
596
597         /* bcm_resume can be called at any time as long as platform device is
598          * bound, so it should use bcm_device_lock to protect access to hci_uart
599          * and device_wake-up GPIO.
600          */
601         mutex_lock(&bcm_device_lock);
602
603         if (!bdev->hu)
604                 goto unlock;
605
606         if (device_may_wakeup(&bdev->pdev->dev)) {
607                 disable_irq_wake(bdev->irq);
608                 bt_dev_dbg(bdev, "BCM irq: disabled");
609         }
610
611         bcm_resume_device(dev);
612
613 unlock:
614         mutex_unlock(&bcm_device_lock);
615
616         pm_runtime_disable(dev);
617         pm_runtime_set_active(dev);
618         pm_runtime_enable(dev);
619
620         return 0;
621 }
622 #endif
623
624 static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false };
625 static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false };
626 static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false };
627
628 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
629         { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 },
630         { "shutdown-gpios", &int_last_shutdown_gpios, 1 },
631         { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 },
632         { },
633 };
634
635 static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false };
636 static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false };
637 static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false };
638
639 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
640         { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 },
641         { "shutdown-gpios", &int_first_shutdown_gpios, 1 },
642         { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 },
643         { },
644 };
645
646 #ifdef CONFIG_ACPI
647 static u8 acpi_active_low = ACPI_ACTIVE_LOW;
648
649 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
650 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = {
651         {
652                 .ident = "Asus T100TA",
653                 .matches = {
654                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
655                                         "ASUSTeK COMPUTER INC."),
656                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
657                 },
658                 .driver_data = &acpi_active_low,
659         },
660         {       /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */
661                 .ident = "Lenovo ThinkPad 8",
662                 .matches = {
663                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
664                         DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"),
665                 },
666                 .driver_data = &acpi_active_low,
667         },
668         { }
669 };
670
671 static int bcm_resource(struct acpi_resource *ares, void *data)
672 {
673         struct bcm_device *dev = data;
674         struct acpi_resource_extended_irq *irq;
675         struct acpi_resource_gpio *gpio;
676         struct acpi_resource_uart_serialbus *sb;
677
678         switch (ares->type) {
679         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
680                 irq = &ares->data.extended_irq;
681                 dev->irq_polarity = irq->polarity;
682                 break;
683
684         case ACPI_RESOURCE_TYPE_GPIO:
685                 gpio = &ares->data.gpio;
686                 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
687                         dev->irq_polarity = gpio->polarity;
688                 break;
689
690         case ACPI_RESOURCE_TYPE_SERIAL_BUS:
691                 sb = &ares->data.uart_serial_bus;
692                 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
693                         dev->init_speed = sb->default_baud_rate;
694                 break;
695
696         default:
697                 break;
698         }
699
700         /* Always tell the ACPI core to skip this resource */
701         return 1;
702 }
703 #endif /* CONFIG_ACPI */
704
705 static int bcm_platform_probe(struct bcm_device *dev)
706 {
707         struct platform_device *pdev = dev->pdev;
708
709         dev->name = dev_name(&pdev->dev);
710
711         dev->clk = devm_clk_get(&pdev->dev, NULL);
712
713         dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
714                                                      "device-wakeup",
715                                                      GPIOD_OUT_LOW);
716         if (IS_ERR(dev->device_wakeup))
717                 return PTR_ERR(dev->device_wakeup);
718
719         dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
720                                                 GPIOD_OUT_LOW);
721         if (IS_ERR(dev->shutdown))
722                 return PTR_ERR(dev->shutdown);
723
724         /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
725         dev->irq = platform_get_irq(pdev, 0);
726         if (dev->irq <= 0) {
727                 struct gpio_desc *gpio;
728
729                 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
730                                                GPIOD_IN);
731                 if (IS_ERR(gpio))
732                         return PTR_ERR(gpio);
733
734                 dev->irq = gpiod_to_irq(gpio);
735         }
736
737         dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
738
739         /* Make sure at-least one of the GPIO is defined and that
740          * a name is specified for this instance
741          */
742         if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
743                 dev_err(&pdev->dev, "invalid platform data\n");
744                 return -EINVAL;
745         }
746
747         return 0;
748 }
749
750 #ifdef CONFIG_ACPI
751 static int bcm_acpi_probe(struct bcm_device *dev)
752 {
753         struct platform_device *pdev = dev->pdev;
754         LIST_HEAD(resources);
755         const struct dmi_system_id *dmi_id;
756         const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
757         const struct acpi_device_id *id;
758         int ret;
759
760         /* Retrieve GPIO data */
761         id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
762         if (id)
763                 gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data;
764
765         ret = devm_acpi_dev_add_driver_gpios(&pdev->dev, gpio_mapping);
766         if (ret)
767                 return ret;
768
769         ret = bcm_platform_probe(dev);
770         if (ret)
771                 return ret;
772
773         /* Retrieve UART ACPI info */
774         ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
775                                      &resources, bcm_resource, dev);
776         if (ret < 0)
777                 return ret;
778         acpi_dev_free_resource_list(&resources);
779
780         dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table);
781         if (dmi_id) {
782                 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
783                             dmi_id->ident);
784                 dev->irq_polarity = *(u8 *)dmi_id->driver_data;
785         }
786
787         return 0;
788 }
789 #else
790 static int bcm_acpi_probe(struct bcm_device *dev)
791 {
792         return -EINVAL;
793 }
794 #endif /* CONFIG_ACPI */
795
796 static int bcm_probe(struct platform_device *pdev)
797 {
798         struct bcm_device *dev;
799         int ret;
800
801         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
802         if (!dev)
803                 return -ENOMEM;
804
805         dev->pdev = pdev;
806
807         if (has_acpi_companion(&pdev->dev))
808                 ret = bcm_acpi_probe(dev);
809         else
810                 ret = bcm_platform_probe(dev);
811         if (ret)
812                 return ret;
813
814         platform_set_drvdata(pdev, dev);
815
816         dev_info(&pdev->dev, "%s device registered.\n", dev->name);
817
818         /* Place this instance on the device list */
819         mutex_lock(&bcm_device_lock);
820         list_add_tail(&dev->list, &bcm_device_list);
821         mutex_unlock(&bcm_device_lock);
822
823         bcm_gpio_set_power(dev, false);
824
825         return 0;
826 }
827
828 static int bcm_remove(struct platform_device *pdev)
829 {
830         struct bcm_device *dev = platform_get_drvdata(pdev);
831
832         mutex_lock(&bcm_device_lock);
833         list_del(&dev->list);
834         mutex_unlock(&bcm_device_lock);
835
836         dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
837
838         return 0;
839 }
840
841 static const struct hci_uart_proto bcm_proto = {
842         .id             = HCI_UART_BCM,
843         .name           = "Broadcom",
844         .manufacturer   = 15,
845         .init_speed     = 115200,
846         .oper_speed     = 4000000,
847         .open           = bcm_open,
848         .close          = bcm_close,
849         .flush          = bcm_flush,
850         .setup          = bcm_setup,
851         .set_baudrate   = bcm_set_baudrate,
852         .recv           = bcm_recv,
853         .enqueue        = bcm_enqueue,
854         .dequeue        = bcm_dequeue,
855 };
856
857 #ifdef CONFIG_ACPI
858 static const struct acpi_device_id bcm_acpi_match[] = {
859         { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
860         { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
861         { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
862         { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
863         { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
864         { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
865         { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
866         { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
867         { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
868         { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
869         { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
870         { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
871         { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
872         { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
873         { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
874         { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
875         { },
876 };
877 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
878 #endif
879
880 /* Platform suspend and resume callbacks */
881 static const struct dev_pm_ops bcm_pm_ops = {
882         SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
883         SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
884 };
885
886 static struct platform_driver bcm_driver = {
887         .probe = bcm_probe,
888         .remove = bcm_remove,
889         .driver = {
890                 .name = "hci_bcm",
891                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
892                 .pm = &bcm_pm_ops,
893         },
894 };
895
896 int __init bcm_init(void)
897 {
898         platform_driver_register(&bcm_driver);
899
900         return hci_uart_register_proto(&bcm_proto);
901 }
902
903 int __exit bcm_deinit(void)
904 {
905         platform_driver_unregister(&bcm_driver);
906
907         return hci_uart_unregister_proto(&bcm_proto);
908 }