bool
default y
select RTC_LIB
+ select SYS_SUPPORTS_APM_EMULATION
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and
Europe. There is an ARM Linux project with a web page at
<http://www.arm.linux.org.uk/>.
+config SYS_SUPPORTS_APM_EMULATION
+ bool
+
config GENERIC_TIME
bool
default n
source "kernel/power/Kconfig"
-config APM
- tristate "Advanced Power Management Emulation"
- ---help---
- APM is a BIOS specification for saving power using several different
- techniques. This is mostly useful for battery powered laptops with
- APM compliant BIOSes. If you say Y here, the system time will be
- reset after a RESUME operation, the /proc/apm device will provide
- battery status information, and user-space programs will receive
- notification of APM "events" (e.g. battery status change).
-
- In order to use APM, you will need supporting software. For location
- and more information, read <file:Documentation/pm.txt> and the
- Battery Powered Linux mini-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>.
-
- This driver does not spin down disk drives (see the hdparm(8)
- manpage ("man 8 hdparm") for that), and it doesn't turn off
- VESA-compliant "green" monitors.
-
- Generally, if you don't have a battery in your machine, there isn't
- much point in using this driver and you should say N. If you get
- random kernel OOPSes or reboots that don't seem to be related to
- anything, try disabling/enabling this option (or disabling/enabling
- APM in your BIOS).
-
endmenu
source "net/Kconfig"
#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
-#include <asm/apm.h>
+#include <asm/apm-emulation.h>
#include <asm/arch/pm.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/sharpsl.h>
process.o ptrace.o semaphore.o setup.o signal.o sys_arm.o \
time.o traps.o
-obj-$(CONFIG_APM) += apm.o
obj-$(CONFIG_ISA_DMA_API) += dma.o
obj-$(CONFIG_ARCH_ACORN) += ecard.o
obj-$(CONFIG_FIQ) += fiq.o
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
-#include <asm/apm.h>
+#include <asm/apm-emulation.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/hardware.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
-#include <asm/apm.h>
+#include <asm/apm-emulation.h>
#include <asm/arch/pm.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/sharpsl.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
-#include <asm/apm.h>
+#include <asm/apm-emulation.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/hardware.h>
endchoice
+config SYS_SUPPORTS_APM_EMULATION
+ bool
+
config SYS_SUPPORTS_BIG_ENDIAN
bool
bool
select SYS_HAS_CPU_MIPS32_R1
select SYS_SUPPORTS_32BIT_KERNEL
+ select SYS_SUPPORTS_APM_EMULATION
config PNX8550
bool
bool
default y if MIPS32_O32 || MIPS32_N32
-config PM
- bool "Power Management support (EXPERIMENTAL)"
- depends on EXPERIMENTAL && SOC_AU1X00
-
-config APM
- tristate "Advanced Power Management Emulation"
- depends on PM
- ---help---
- APM is a BIOS specification for saving power using several different
- techniques. This is mostly useful for battery powered systems with
- APM compliant BIOSes. If you say Y here, the system time will be
- reset after a RESUME operation, the /proc/apm device will provide
- battery status information, and user-space programs will receive
- notification of APM "events" (e.g. battery status change).
-
- In order to use APM, you will need supporting software. For location
- and more information, read <file:Documentation/pm.txt> and the
- Battery Powered Linux mini-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>.
-
- This driver does not spin down disk drives (see the hdparm(8)
- manpage ("man 8 hdparm") for that), and it doesn't turn off
- VESA-compliant "green" monitors.
-
- Generally, if you don't have a battery in your machine, there isn't
- much point in using this driver and you should say N. If you get
- random kernel OOPSes or reboots that don't seem to be related to
- anything, try disabling/enabling this option (or disabling/enabling
- APM in your BIOS).
+endmenu
+
+menu "Power management options"
+
+source "kernel/power/Kconfig"
endmenu
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_MODULES) += mips_ksyms.o module.o
-obj-$(CONFIG_APM) += apm.o
-
obj-$(CONFIG_CPU_R3000) += r2300_fpu.o r2300_switch.o
obj-$(CONFIG_CPU_TX39XX) += r2300_fpu.o r2300_switch.o
obj-$(CONFIG_CPU_TX49XX) += r4k_fpu.o r4k_switch.o
+++ /dev/null
-/*
- * bios-less APM driver for MIPS Linux
- * Jamey Hicks <jamey@crl.dec.com>
- * adapted from the APM BIOS driver for Linux by Stephen Rothwell (sfr@linuxcare.com)
- *
- * APM 1.2 Reference:
- * Intel Corporation, Microsoft Corporation. Advanced Power Management
- * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
- *
- * [This document is available from Microsoft at:
- * http://www.microsoft.com/hwdev/busbios/amp_12.htm]
- */
-#include <linux/module.h>
-#include <linux/poll.h>
-#include <linux/timer.h>
-#include <linux/slab.h>
-#include <linux/proc_fs.h>
-#include <linux/miscdevice.h>
-#include <linux/apm_bios.h>
-#include <linux/capability.h>
-#include <linux/sched.h>
-#include <linux/pm.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/init.h>
-#include <linux/completion.h>
-
-#include <asm/apm.h> /* apm_power_info */
-#include <asm/system.h>
-
-/*
- * The apm_bios device is one of the misc char devices.
- * This is its minor number.
- */
-#define APM_MINOR_DEV 134
-
-/*
- * See Documentation/Config.help for the configuration options.
- *
- * Various options can be changed at boot time as follows:
- * (We allow underscores for compatibility with the modules code)
- * apm=on/off enable/disable APM
- */
-
-/*
- * Maximum number of events stored
- */
-#define APM_MAX_EVENTS 16
-
-struct apm_queue {
- unsigned int event_head;
- unsigned int event_tail;
- apm_event_t events[APM_MAX_EVENTS];
-};
-
-/*
- * The per-file APM data
- */
-struct apm_user {
- struct list_head list;
-
- unsigned int suser: 1;
- unsigned int writer: 1;
- unsigned int reader: 1;
-
- int suspend_result;
- unsigned int suspend_state;
-#define SUSPEND_NONE 0 /* no suspend pending */
-#define SUSPEND_PENDING 1 /* suspend pending read */
-#define SUSPEND_READ 2 /* suspend read, pending ack */
-#define SUSPEND_ACKED 3 /* suspend acked */
-#define SUSPEND_DONE 4 /* suspend completed */
-
- struct apm_queue queue;
-};
-
-/*
- * Local variables
- */
-static int suspends_pending;
-static int apm_disabled;
-static int mips_apm_active;
-
-static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
-static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
-
-/*
- * This is a list of everyone who has opened /dev/apm_bios
- */
-static DECLARE_RWSEM(user_list_lock);
-static LIST_HEAD(apm_user_list);
-
-/*
- * kapmd info. kapmd provides us a process context to handle
- * "APM" events within - specifically necessary if we're going
- * to be suspending the system.
- */
-static DECLARE_WAIT_QUEUE_HEAD(kapmd_wait);
-static DECLARE_COMPLETION(kapmd_exit);
-static DEFINE_SPINLOCK(kapmd_queue_lock);
-static struct apm_queue kapmd_queue;
-
-
-static const char driver_version[] = "1.13"; /* no spaces */
-
-
-
-/*
- * Compatibility cruft until the IPAQ people move over to the new
- * interface.
- */
-static void __apm_get_power_status(struct apm_power_info *info)
-{
-}
-
-/*
- * This allows machines to provide their own "apm get power status" function.
- */
-void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status;
-EXPORT_SYMBOL(apm_get_power_status);
-
-
-/*
- * APM event queue management.
- */
-static inline int queue_empty(struct apm_queue *q)
-{
- return q->event_head == q->event_tail;
-}
-
-static inline apm_event_t queue_get_event(struct apm_queue *q)
-{
- q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;
- return q->events[q->event_tail];
-}
-
-static void queue_add_event(struct apm_queue *q, apm_event_t event)
-{
- q->event_head = (q->event_head + 1) % APM_MAX_EVENTS;
- if (q->event_head == q->event_tail) {
- static int notified;
-
- if (notified++ == 0)
- printk(KERN_ERR "apm: an event queue overflowed\n");
- q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;
- }
- q->events[q->event_head] = event;
-}
-
-static void queue_event_one_user(struct apm_user *as, apm_event_t event)
-{
- if (as->suser && as->writer) {
- switch (event) {
- case APM_SYS_SUSPEND:
- case APM_USER_SUSPEND:
- /*
- * If this user already has a suspend pending,
- * don't queue another one.
- */
- if (as->suspend_state != SUSPEND_NONE)
- return;
-
- as->suspend_state = SUSPEND_PENDING;
- suspends_pending++;
- break;
- }
- }
- queue_add_event(&as->queue, event);
-}
-
-static void queue_event(apm_event_t event, struct apm_user *sender)
-{
- struct apm_user *as;
-
- down_read(&user_list_lock);
- list_for_each_entry(as, &apm_user_list, list) {
- if (as != sender && as->reader)
- queue_event_one_user(as, event);
- }
- up_read(&user_list_lock);
- wake_up_interruptible(&apm_waitqueue);
-}
-
-static void apm_suspend(void)
-{
- struct apm_user *as;
- int err = pm_suspend(PM_SUSPEND_MEM);
-
- /*
- * Anyone on the APM queues will think we're still suspended.
- * Send a message so everyone knows we're now awake again.
- */
- queue_event(APM_NORMAL_RESUME, NULL);
-
- /*
- * Finally, wake up anyone who is sleeping on the suspend.
- */
- down_read(&user_list_lock);
- list_for_each_entry(as, &apm_user_list, list) {
- as->suspend_result = err;
- as->suspend_state = SUSPEND_DONE;
- }
- up_read(&user_list_lock);
-
- wake_up(&apm_suspend_waitqueue);
-}
-
-static ssize_t apm_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
-{
- struct apm_user *as = fp->private_data;
- apm_event_t event;
- int i = count, ret = 0;
-
- if (count < sizeof(apm_event_t))
- return -EINVAL;
-
- if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK)
- return -EAGAIN;
-
- wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue));
-
- while ((i >= sizeof(event)) && !queue_empty(&as->queue)) {
- event = queue_get_event(&as->queue);
-
- ret = -EFAULT;
- if (copy_to_user(buf, &event, sizeof(event)))
- break;
-
- if (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND)
- as->suspend_state = SUSPEND_READ;
-
- buf += sizeof(event);
- i -= sizeof(event);
- }
-
- if (i < count)
- ret = count - i;
-
- return ret;
-}
-
-static unsigned int apm_poll(struct file *fp, poll_table * wait)
-{
- struct apm_user *as = fp->private_data;
-
- poll_wait(fp, &apm_waitqueue, wait);
- return queue_empty(&as->queue) ? 0 : POLLIN | POLLRDNORM;
-}
-
-/*
- * apm_ioctl - handle APM ioctl
- *
- * APM_IOC_SUSPEND
- * This IOCTL is overloaded, and performs two functions. It is used to:
- * - initiate a suspend
- * - acknowledge a suspend read from /dev/apm_bios.
- * Only when everyone who has opened /dev/apm_bios with write permission
- * has acknowledge does the actual suspend happen.
- */
-static int
-apm_ioctl(struct inode * inode, struct file *filp, unsigned int cmd, unsigned long arg)
-{
- struct apm_user *as = filp->private_data;
- unsigned long flags;
- int err = -EINVAL;
-
- if (!as->suser || !as->writer)
- return -EPERM;
-
- switch (cmd) {
- case APM_IOC_SUSPEND:
- as->suspend_result = -EINTR;
-
- if (as->suspend_state == SUSPEND_READ) {
- /*
- * If we read a suspend command from /dev/apm_bios,
- * then the corresponding APM_IOC_SUSPEND ioctl is
- * interpreted as an acknowledge.
- */
- as->suspend_state = SUSPEND_ACKED;
- suspends_pending--;
- } else {
- /*
- * Otherwise it is a request to suspend the system.
- * Queue an event for all readers, and expect an
- * acknowledge from all writers who haven't already
- * acknowledged.
- */
- queue_event(APM_USER_SUSPEND, as);
- }
-
- /*
- * If there are no further acknowledges required, suspend
- * the system.
- */
- if (suspends_pending == 0)
- apm_suspend();
-
- /*
- * Wait for the suspend/resume to complete. If there are
- * pending acknowledges, we wait here for them.
- *
- * Note that we need to ensure that the PM subsystem does
- * not kick us out of the wait when it suspends the threads.
- */
- flags = current->flags;
- current->flags |= PF_NOFREEZE;
-
- /*
- * Note: do not allow a thread which is acking the suspend
- * to escape until the resume is complete.
- */
- if (as->suspend_state == SUSPEND_ACKED)
- wait_event(apm_suspend_waitqueue,
- as->suspend_state == SUSPEND_DONE);
- else
- wait_event_interruptible(apm_suspend_waitqueue,
- as->suspend_state == SUSPEND_DONE);
-
- current->flags = flags;
- err = as->suspend_result;
- as->suspend_state = SUSPEND_NONE;
- break;
- }
-
- return err;
-}
-
-static int apm_release(struct inode * inode, struct file * filp)
-{
- struct apm_user *as = filp->private_data;
- filp->private_data = NULL;
-
- down_write(&user_list_lock);
- list_del(&as->list);
- up_write(&user_list_lock);
-
- /*
- * We are now unhooked from the chain. As far as new
- * events are concerned, we no longer exist. However, we
- * need to balance suspends_pending, which means the
- * possibility of sleeping.
- */
- if (as->suspend_state != SUSPEND_NONE) {
- suspends_pending -= 1;
- if (suspends_pending == 0)
- apm_suspend();
- }
-
- kfree(as);
- return 0;
-}
-
-static int apm_open(struct inode * inode, struct file * filp)
-{
- struct apm_user *as;
-
- as = kzalloc(sizeof(*as), GFP_KERNEL);
- if (as) {
- /*
- * XXX - this is a tiny bit broken, when we consider BSD
- * process accounting. If the device is opened by root, we
- * instantly flag that we used superuser privs. Who knows,
- * we might close the device immediately without doing a
- * privileged operation -- cevans
- */
- as->suser = capable(CAP_SYS_ADMIN);
- as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
- as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
-
- down_write(&user_list_lock);
- list_add(&as->list, &apm_user_list);
- up_write(&user_list_lock);
-
- filp->private_data = as;
- }
-
- return as ? 0 : -ENOMEM;
-}
-
-static struct file_operations apm_bios_fops = {
- .owner = THIS_MODULE,
- .read = apm_read,
- .poll = apm_poll,
- .ioctl = apm_ioctl,
- .open = apm_open,
- .release = apm_release,
-};
-
-static struct miscdevice apm_device = {
- .minor = APM_MINOR_DEV,
- .name = "apm_bios",
- .fops = &apm_bios_fops
-};
-
-
-#ifdef CONFIG_PROC_FS
-/*
- * Arguments, with symbols from linux/apm_bios.h.
- *
- * 0) Linux driver version (this will change if format changes)
- * 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
- * 2) APM flags from APM Installation Check (0x00):
- * bit 0: APM_16_BIT_SUPPORT
- * bit 1: APM_32_BIT_SUPPORT
- * bit 2: APM_IDLE_SLOWS_CLOCK
- * bit 3: APM_BIOS_DISABLED
- * bit 4: APM_BIOS_DISENGAGED
- * 3) AC line status
- * 0x00: Off-line
- * 0x01: On-line
- * 0x02: On backup power (BIOS >= 1.1 only)
- * 0xff: Unknown
- * 4) Battery status
- * 0x00: High
- * 0x01: Low
- * 0x02: Critical
- * 0x03: Charging
- * 0x04: Selected battery not present (BIOS >= 1.2 only)
- * 0xff: Unknown
- * 5) Battery flag
- * bit 0: High
- * bit 1: Low
- * bit 2: Critical
- * bit 3: Charging
- * bit 7: No system battery
- * 0xff: Unknown
- * 6) Remaining battery life (percentage of charge):
- * 0-100: valid
- * -1: Unknown
- * 7) Remaining battery life (time units):
- * Number of remaining minutes or seconds
- * -1: Unknown
- * 8) min = minutes; sec = seconds
- */
-static int apm_get_info(char *buf, char **start, off_t fpos, int length)
-{
- struct apm_power_info info;
- char *units;
- int ret;
-
- info.ac_line_status = 0xff;
- info.battery_status = 0xff;
- info.battery_flag = 0xff;
- info.battery_life = -1;
- info.time = -1;
- info.units = -1;
-
- if (apm_get_power_status)
- apm_get_power_status(&info);
-
- switch (info.units) {
- default: units = "?"; break;
- case 0: units = "min"; break;
- case 1: units = "sec"; break;
- }
-
- ret = sprintf(buf, "%s 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
- driver_version, APM_32_BIT_SUPPORT,
- info.ac_line_status, info.battery_status,
- info.battery_flag, info.battery_life,
- info.time, units);
-
- return ret;
-}
-#endif
-
-static int kapmd(void *arg)
-{
- daemonize("kapmd");
- current->flags |= PF_NOFREEZE;
-
- do {
- apm_event_t event;
-
- wait_event_interruptible(kapmd_wait,
- !queue_empty(&kapmd_queue) || !mips_apm_active);
-
- if (!mips_apm_active)
- break;
-
- spin_lock_irq(&kapmd_queue_lock);
- event = 0;
- if (!queue_empty(&kapmd_queue))
- event = queue_get_event(&kapmd_queue);
- spin_unlock_irq(&kapmd_queue_lock);
-
- switch (event) {
- case 0:
- break;
-
- case APM_LOW_BATTERY:
- case APM_POWER_STATUS_CHANGE:
- queue_event(event, NULL);
- break;
-
- case APM_USER_SUSPEND:
- case APM_SYS_SUSPEND:
- queue_event(event, NULL);
- if (suspends_pending == 0)
- apm_suspend();
- break;
-
- case APM_CRITICAL_SUSPEND:
- apm_suspend();
- break;
- }
- } while (1);
-
- complete_and_exit(&kapmd_exit, 0);
-}
-
-static int __init apm_init(void)
-{
- int ret;
-
- if (apm_disabled) {
- printk(KERN_NOTICE "apm: disabled on user request.\n");
- return -ENODEV;
- }
-
- mips_apm_active = 1;
-
- ret = kernel_thread(kapmd, NULL, CLONE_KERNEL);
- if (ret < 0) {
- mips_apm_active = 0;
- return ret;
- }
-
-#ifdef CONFIG_PROC_FS
- create_proc_info_entry("apm", 0, NULL, apm_get_info);
-#endif
-
- ret = misc_register(&apm_device);
- if (ret != 0) {
- remove_proc_entry("apm", NULL);
-
- mips_apm_active = 0;
- wake_up(&kapmd_wait);
- wait_for_completion(&kapmd_exit);
- }
-
- return ret;
-}
-
-static void __exit apm_exit(void)
-{
- misc_deregister(&apm_device);
- remove_proc_entry("apm", NULL);
-
- mips_apm_active = 0;
- wake_up(&kapmd_wait);
- wait_for_completion(&kapmd_exit);
-}
-
-module_init(apm_init);
-module_exit(apm_exit);
-
-MODULE_AUTHOR("Stephen Rothwell");
-MODULE_DESCRIPTION("Advanced Power Management");
-MODULE_LICENSE("GPL");
-
-#ifndef MODULE
-static int __init apm_setup(char *str)
-{
- while ((str != NULL) && (*str != '\0')) {
- if (strncmp(str, "off", 3) == 0)
- apm_disabled = 1;
- if (strncmp(str, "on", 2) == 0)
- apm_disabled = 0;
- str = strchr(str, ',');
- if (str != NULL)
- str += strspn(str, ", \t");
- }
- return 1;
-}
-
-__setup("apm=", apm_setup);
-#endif
-
-/**
- * apm_queue_event - queue an APM event for kapmd
- * @event: APM event
- *
- * Queue an APM event for kapmd to process and ultimately take the
- * appropriate action. Only a subset of events are handled:
- * %APM_LOW_BATTERY
- * %APM_POWER_STATUS_CHANGE
- * %APM_USER_SUSPEND
- * %APM_SYS_SUSPEND
- * %APM_CRITICAL_SUSPEND
- */
-void apm_queue_event(apm_event_t event)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&kapmd_queue_lock, flags);
- queue_add_event(&kapmd_queue, event);
- spin_unlock_irqrestore(&kapmd_queue_lock, flags);
-
- wake_up_interruptible(&kapmd_wait);
-}
-EXPORT_SYMBOL(apm_queue_event);
config GENERIC_TIME
def_bool n
+config SYS_SUPPORTS_APM_EMULATION
+ bool
+
config ARCH_MAY_HAVE_PC_FDC
bool
config SH_HP6XX
bool "HP6XX"
+ select SYS_SUPPORTS_APM_EMULATION
help
Select HP6XX if configuring for a HP jornada HP6xx.
More information (hardware only) at
source kernel/power/Kconfig
-config APM
- bool "Advanced Power Management Emulation"
- depends on PM
endmenu
source "net/Kconfig"
* modify it under the terms of the GNU General Public License.
*/
#include <linux/module.h>
-#include <linux/apm_bios.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
-#include <asm/io.h>
-#include <asm/apm.h>
+#include <linux/apm-emulation.h>
+#include <linux/io.h>
#include <asm/adc.h>
#include <asm/hp6xx.h>
#define MODNAME "hp6x0_apm"
-static int hp6x0_apm_get_info(char *buf, char **start, off_t fpos, int length)
+static void hp6x0_apm_get_power_status(struct apm_power_info *info)
{
+ int battery, backup, charging, percentage;
u8 pgdr;
- char *p;
- int battery_status;
- int battery_flag;
- int ac_line_status;
- int time_units = APM_BATTERY_LIFE_UNKNOWN;
- int battery = adc_single(ADC_CHANNEL_BATTERY);
- int backup = adc_single(ADC_CHANNEL_BACKUP);
- int charging = adc_single(ADC_CHANNEL_CHARGE);
- int percentage;
+ battery = adc_single(ADC_CHANNEL_BATTERY);
+ backup = adc_single(ADC_CHANNEL_BACKUP);
+ charging = adc_single(ADC_CHANNEL_CHARGE);
percentage = 100 * (battery - HP680_BATTERY_MIN) /
(HP680_BATTERY_MAX - HP680_BATTERY_MIN);
- ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
+ info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
APM_AC_ONLINE : APM_AC_OFFLINE;
- p = buf;
-
pgdr = ctrl_inb(SH7709_PGDR);
if (pgdr & PGDR_MAIN_BATTERY_OUT) {
- battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
- battery_flag = 0x80;
- percentage = -1;
- } else if (charging < 8 ) {
- battery_status = APM_BATTERY_STATUS_CHARGING;
- battery_flag = 0x08;
- ac_line_status = 0xff;
+ info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
+ info->battery_flag = 0x80;
+ } else if (charging < 8) {
+ info->battery_status = APM_BATTERY_STATUS_CHARGING;
+ info->battery_flag = 0x08;
+ info->ac_line_status = 0xff;
} else if (percentage <= APM_CRITICAL) {
- battery_status = APM_BATTERY_STATUS_CRITICAL;
- battery_flag = 0x04;
+ info->battery_status = APM_BATTERY_STATUS_CRITICAL;
+ info->battery_flag = 0x04;
} else if (percentage <= APM_LOW) {
- battery_status = APM_BATTERY_STATUS_LOW;
- battery_flag = 0x02;
+ info->battery_status = APM_BATTERY_STATUS_LOW;
+ info->battery_flag = 0x02;
} else {
- battery_status = APM_BATTERY_STATUS_HIGH;
- battery_flag = 0x01;
+ info->battery_status = APM_BATTERY_STATUS_HIGH;
+ info->battery_flag = 0x01;
}
- p += sprintf(p, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
- APM_32_BIT_SUPPORT,
- ac_line_status,
- battery_status,
- battery_flag,
- percentage,
- time_units,
- "min");
- p += sprintf(p, "bat=%d backup=%d charge=%d\n",
- battery, backup, charging);
-
- return p - buf;
+ info->units = 0;
}
static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
int ret;
ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
- IRQF_DISABLED, MODNAME, 0);
+ IRQF_DISABLED, MODNAME, NULL);
if (unlikely(ret < 0)) {
printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
HP680_BTN_IRQ);
return ret;
}
- apm_get_info = hp6x0_apm_get_info;
+ apm_get_power_status = hp6x0_apm_get_power_status;
return ret;
}
static void __exit hp6x0_apm_exit(void)
{
free_irq(HP680_BTN_IRQ, 0);
- apm_get_info = 0;
+ apm_get_info = NULL;
}
module_init(hp6x0_apm_init);
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
-obj-$(CONFIG_APM) += apm.o
obj-$(CONFIG_PM) += pm.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
+++ /dev/null
-/*
- * bios-less APM driver for hp680
- *
- * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
- *
- * based on ARM APM driver by
- * Jamey Hicks <jamey@crl.dec.com>
- *
- * adapted from the APM BIOS driver for Linux by
- * Stephen Rothwell (sfr@linuxcare.com)
- *
- * APM 1.2 Reference:
- * Intel Corporation, Microsoft Corporation. Advanced Power Management
- * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
- *
- * [This document is available from Microsoft at:
- * http://www.microsoft.com/hwdev/busbios/amp_12.htm]
- */
-#include <linux/module.h>
-#include <linux/poll.h>
-#include <linux/timer.h>
-#include <linux/slab.h>
-#include <linux/proc_fs.h>
-#include <linux/miscdevice.h>
-#include <linux/apm_bios.h>
-#include <linux/pm.h>
-#include <linux/pm_legacy.h>
-#include <asm/apm.h>
-
-#define MODNAME "apm"
-
-/*
- * The apm_bios device is one of the misc char devices.
- * This is its minor number.
- */
-#define APM_MINOR_DEV 134
-
-/*
- * Maximum number of events stored
- */
-#define APM_MAX_EVENTS 16
-
-struct apm_queue {
- unsigned int event_head;
- unsigned int event_tail;
- apm_event_t events[APM_MAX_EVENTS];
-};
-
-/*
- * The per-file APM data
- */
-struct apm_user {
- struct list_head list;
-
- unsigned int suser: 1;
- unsigned int writer: 1;
- unsigned int reader: 1;
-
- int suspend_result;
- unsigned int suspend_state;
-#define SUSPEND_NONE 0 /* no suspend pending */
-#define SUSPEND_PENDING 1 /* suspend pending read */
-#define SUSPEND_READ 2 /* suspend read, pending ack */
-#define SUSPEND_ACKED 3 /* suspend acked */
-#define SUSPEND_DONE 4 /* suspend completed */
-
- struct apm_queue queue;
-};
-
-/*
- * Local variables
- */
-static int suspends_pending;
-
-static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
-static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
-
-/*
- * This is a list of everyone who has opened /dev/apm_bios
- */
-static DECLARE_RWSEM(user_list_lock);
-static LIST_HEAD(apm_user_list);
-
-/*
- * kapmd info. kapmd provides us a process context to handle
- * "APM" events within - specifically necessary if we're going
- * to be suspending the system.
- */
-static DECLARE_WAIT_QUEUE_HEAD(kapmd_wait);
-static DECLARE_COMPLETION(kapmd_exit);
-static DEFINE_SPINLOCK(kapmd_queue_lock);
-static struct apm_queue kapmd_queue;
-
-int apm_suspended;
-EXPORT_SYMBOL(apm_suspended);
-
-/* Platform-specific apm_read_proc(). */
-int (*apm_get_info)(char *buf, char **start, off_t fpos, int length);
-EXPORT_SYMBOL(apm_get_info);
-
-/*
- * APM event queue management.
- */
-static inline int queue_empty(struct apm_queue *q)
-{
- return q->event_head == q->event_tail;
-}
-
-static inline apm_event_t queue_get_event(struct apm_queue *q)
-{
- q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;
- return q->events[q->event_tail];
-}
-
-static void queue_add_event(struct apm_queue *q, apm_event_t event)
-{
- q->event_head = (q->event_head + 1) % APM_MAX_EVENTS;
- if (q->event_head == q->event_tail) {
- static int notified;
-
- if (notified++ == 0)
- printk(KERN_ERR "apm: an event queue overflowed\n");
-
- q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;
- }
- q->events[q->event_head] = event;
-}
-
-static void queue_event_one_user(struct apm_user *as, apm_event_t event)
-{
- if (as->suser && as->writer) {
- switch (event) {
- case APM_SYS_SUSPEND:
- case APM_USER_SUSPEND:
- /*
- * If this user already has a suspend pending,
- * don't queue another one.
- */
- if (as->suspend_state != SUSPEND_NONE)
- return;
-
- as->suspend_state = SUSPEND_PENDING;
- suspends_pending++;
- break;
- }
- }
- queue_add_event(&as->queue, event);
-}
-
-static void queue_event(apm_event_t event, struct apm_user *sender)
-{
- struct apm_user *as;
-
- down_read(&user_list_lock);
-
- list_for_each_entry(as, &apm_user_list, list)
- if (as != sender && as->reader)
- queue_event_one_user(as, event);
-
- up_read(&user_list_lock);
- wake_up_interruptible(&apm_waitqueue);
-}
-
-/**
- * apm_queue_event - queue an APM event for kapmd
- * @event: APM event
- *
- * Queue an APM event for kapmd to process and ultimately take the
- * appropriate action. Only a subset of events are handled:
- * %APM_LOW_BATTERY
- * %APM_POWER_STATUS_CHANGE
- * %APM_USER_SUSPEND
- * %APM_SYS_SUSPEND
- * %APM_CRITICAL_SUSPEND
- */
-void apm_queue_event(apm_event_t event)
-{
- spin_lock_irq(&kapmd_queue_lock);
- queue_add_event(&kapmd_queue, event);
- spin_unlock_irq(&kapmd_queue_lock);
-
- wake_up_interruptible(&kapmd_wait);
-}
-EXPORT_SYMBOL(apm_queue_event);
-
-static void apm_suspend(void)
-{
- struct apm_user *as;
- int err;
-
- apm_suspended = 1;
- err = pm_suspend(PM_SUSPEND_MEM);
-
- /*
- * Anyone on the APM queues will think we're still suspended.
- * Send a message so everyone knows we're now awake again.
- */
- queue_event(APM_NORMAL_RESUME, NULL);
-
- /*
- * Finally, wake up anyone who is sleeping on the suspend.
- */
- down_read(&user_list_lock);
- list_for_each_entry(as, &apm_user_list, list) {
- as->suspend_result = err;
- as->suspend_state = SUSPEND_DONE;
- }
- up_read(&user_list_lock);
-
- wake_up(&apm_suspend_waitqueue);
- apm_suspended = 0;
-}
-
-static ssize_t apm_read(struct file *fp, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct apm_user *as = fp->private_data;
- apm_event_t event;
- int i = count, ret = 0;
-
- if (count < sizeof(apm_event_t))
- return -EINVAL;
-
- if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK)
- return -EAGAIN;
-
- wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue));
-
- while ((i >= sizeof(event)) && !queue_empty(&as->queue)) {
- event = queue_get_event(&as->queue);
-
- ret = -EFAULT;
- if (copy_to_user(buf, &event, sizeof(event)))
- break;
-
- if (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND)
- as->suspend_state = SUSPEND_READ;
-
- buf += sizeof(event);
- i -= sizeof(event);
- }
-
- if (i < count)
- ret = count - i;
-
- return ret;
-}
-
-static unsigned int apm_poll(struct file *fp, poll_table * wait)
-{
- struct apm_user *as = fp->private_data;
-
- poll_wait(fp, &apm_waitqueue, wait);
- return queue_empty(&as->queue) ? 0 : POLLIN | POLLRDNORM;
-}
-
-/*
- * apm_ioctl - handle APM ioctl
- *
- * APM_IOC_SUSPEND
- * This IOCTL is overloaded, and performs two functions. It is used to:
- * - initiate a suspend
- * - acknowledge a suspend read from /dev/apm_bios.
- * Only when everyone who has opened /dev/apm_bios with write permission
- * has acknowledge does the actual suspend happen.
- */
-static int
-apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
-{
- struct apm_user *as = filp->private_data;
- unsigned long flags;
- int err = -EINVAL;
-
- if (!as->suser || !as->writer)
- return -EPERM;
-
- switch (cmd) {
- case APM_IOC_SUSPEND:
- as->suspend_result = -EINTR;
-
- if (as->suspend_state == SUSPEND_READ) {
- /*
- * If we read a suspend command from /dev/apm_bios,
- * then the corresponding APM_IOC_SUSPEND ioctl is
- * interpreted as an acknowledge.
- */
- as->suspend_state = SUSPEND_ACKED;
- suspends_pending--;
- } else {
- /*
- * Otherwise it is a request to suspend the system.
- * Queue an event for all readers, and expect an
- * acknowledge from all writers who haven't already
- * acknowledged.
- */
- queue_event(APM_USER_SUSPEND, as);
- }
-
- /*
- * If there are no further acknowledges required, suspend
- * the system.
- */
- if (suspends_pending == 0)
- apm_suspend();
-
- /*
- * Wait for the suspend/resume to complete. If there are
- * pending acknowledges, we wait here for them.
- *
- * Note that we need to ensure that the PM subsystem does
- * not kick us out of the wait when it suspends the threads.
- */
- flags = current->flags;
- current->flags |= PF_NOFREEZE;
-
- /*
- * Note: do not allow a thread which is acking the suspend
- * to escape until the resume is complete.
- */
- if (as->suspend_state == SUSPEND_ACKED)
- wait_event(apm_suspend_waitqueue,
- as->suspend_state == SUSPEND_DONE);
- else
- wait_event_interruptible(apm_suspend_waitqueue,
- as->suspend_state == SUSPEND_DONE);
-
- current->flags = flags;
- err = as->suspend_result;
- as->suspend_state = SUSPEND_NONE;
- break;
- }
-
- return err;
-}
-
-static int apm_release(struct inode * inode, struct file * filp)
-{
- struct apm_user *as = filp->private_data;
- filp->private_data = NULL;
-
- down_write(&user_list_lock);
- list_del(&as->list);
- up_write(&user_list_lock);
-
- /*
- * We are now unhooked from the chain. As far as new
- * events are concerned, we no longer exist. However, we
- * need to balance suspends_pending, which means the
- * possibility of sleeping.
- */
- if (as->suspend_state != SUSPEND_NONE) {
- suspends_pending -= 1;
- if (suspends_pending == 0)
- apm_suspend();
- }
-
- kfree(as);
- return 0;
-}
-
-static int apm_open(struct inode * inode, struct file * filp)
-{
- struct apm_user *as;
-
- as = kzalloc(sizeof(*as), GFP_KERNEL);
- if (as) {
- /*
- * XXX - this is a tiny bit broken, when we consider BSD
- * process accounting. If the device is opened by root, we
- * instantly flag that we used superuser privs. Who knows,
- * we might close the device immediately without doing a
- * privileged operation -- cevans
- */
- as->suser = capable(CAP_SYS_ADMIN);
- as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
- as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
-
- down_write(&user_list_lock);
- list_add(&as->list, &apm_user_list);
- up_write(&user_list_lock);
-
- filp->private_data = as;
- }
-
- return as ? 0 : -ENOMEM;
-}
-
-static struct file_operations apm_bios_fops = {
- .owner = THIS_MODULE,
- .read = apm_read,
- .poll = apm_poll,
- .ioctl = apm_ioctl,
- .open = apm_open,
- .release = apm_release,
-};
-
-static struct miscdevice apm_device = {
- .minor = APM_MINOR_DEV,
- .name = "apm_bios",
- .fops = &apm_bios_fops
-};
-
-
-#ifdef CONFIG_PROC_FS
-/*
- * Arguments, with symbols from linux/apm_bios.h.
- *
- * 0) Linux driver version (this will change if format changes)
- * 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
- * 2) APM flags from APM Installation Check (0x00):
- * bit 0: APM_16_BIT_SUPPORT
- * bit 1: APM_32_BIT_SUPPORT
- * bit 2: APM_IDLE_SLOWS_CLOCK
- * bit 3: APM_BIOS_DISABLED
- * bit 4: APM_BIOS_DISENGAGED
- * 3) AC line status
- * 0x00: Off-line
- * 0x01: On-line
- * 0x02: On backup power (BIOS >= 1.1 only)
- * 0xff: Unknown
- * 4) Battery status
- * 0x00: High
- * 0x01: Low
- * 0x02: Critical
- * 0x03: Charging
- * 0x04: Selected battery not present (BIOS >= 1.2 only)
- * 0xff: Unknown
- * 5) Battery flag
- * bit 0: High
- * bit 1: Low
- * bit 2: Critical
- * bit 3: Charging
- * bit 7: No system battery
- * 0xff: Unknown
- * 6) Remaining battery life (percentage of charge):
- * 0-100: valid
- * -1: Unknown
- * 7) Remaining battery life (time units):
- * Number of remaining minutes or seconds
- * -1: Unknown
- * 8) min = minutes; sec = seconds
- */
-static int apm_read_proc(char *buf, char **start, off_t fpos, int length)
-{
- if (likely(apm_get_info))
- return apm_get_info(buf, start, fpos, length);
-
- return -EINVAL;
-}
-#endif
-
-static int kapmd(void *arg)
-{
- daemonize("kapmd");
- current->flags |= PF_NOFREEZE;
-
- do {
- apm_event_t event;
-
- wait_event_interruptible(kapmd_wait,
- !queue_empty(&kapmd_queue) || !pm_active);
-
- if (!pm_active)
- break;
-
- spin_lock_irq(&kapmd_queue_lock);
- event = 0;
- if (!queue_empty(&kapmd_queue))
- event = queue_get_event(&kapmd_queue);
- spin_unlock_irq(&kapmd_queue_lock);
-
- switch (event) {
- case 0:
- break;
-
- case APM_LOW_BATTERY:
- case APM_POWER_STATUS_CHANGE:
- queue_event(event, NULL);
- break;
-
- case APM_USER_SUSPEND:
- case APM_SYS_SUSPEND:
- queue_event(event, NULL);
- if (suspends_pending == 0)
- apm_suspend();
- break;
-
- case APM_CRITICAL_SUSPEND:
- apm_suspend();
- break;
- }
- } while (1);
-
- complete_and_exit(&kapmd_exit, 0);
-}
-
-static int __init apm_init(void)
-{
- int ret;
-
- pm_active = 1;
-
- ret = kernel_thread(kapmd, NULL, CLONE_KERNEL);
- if (unlikely(ret < 0)) {
- pm_active = 0;
- return ret;
- }
-
- create_proc_info_entry("apm", 0, NULL, apm_read_proc);
-
- ret = misc_register(&apm_device);
- if (unlikely(ret != 0)) {
- remove_proc_entry("apm", NULL);
-
- pm_active = 0;
- wake_up(&kapmd_wait);
- wait_for_completion(&kapmd_exit);
- }
-
- return ret;
-}
-
-static void __exit apm_exit(void)
-{
- misc_deregister(&apm_device);
- remove_proc_entry("apm", NULL);
-
- pm_active = 0;
- wake_up(&kapmd_wait);
- wait_for_completion(&kapmd_exit);
-}
-
-module_init(apm_init);
-module_exit(apm_exit);
-
-MODULE_AUTHOR("Stephen Rothwell, Andriy Skulysh");
-MODULE_DESCRIPTION("Advanced Power Management");
-MODULE_LICENSE("GPL");
obj-$(CONFIG_PRINTER) += lp.o
obj-$(CONFIG_TIPAR) += tipar.o
+obj-$(CONFIG_APM_EMULATION) += apm-emulation.o
+
obj-$(CONFIG_DTLK) += dtlk.o
obj-$(CONFIG_R3964) += n_r3964.o
obj-$(CONFIG_APPLICOM) += applicom.o
/*
- * bios-less APM driver for ARM Linux
+ * bios-less APM driver for ARM Linux
* Jamey Hicks <jamey@crl.dec.com>
* adapted from the APM BIOS driver for Linux by Stephen Rothwell (sfr@linuxcare.com)
*
#include <linux/capability.h>
#include <linux/sched.h>
#include <linux/pm.h>
+#include <linux/apm-emulation.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/kthread.h>
#include <linux/delay.h>
-#include <asm/apm.h> /* apm_power_info */
#include <asm/system.h>
/*
list_for_each_entry(as, &apm_user_list, list) {
if (as->suspend_state == SUSPEND_WAIT ||
as->suspend_state == SUSPEND_ACKED) {
- as->suspend_result = err;
+ as->suspend_result = err;
as->suspend_state = SUSPEND_DONE;
}
}
info.battery_flag, info.battery_life,
info.time, units);
- return ret;
+ return ret;
}
#endif
+++ /dev/null
-/* -*- linux-c -*-
- *
- * (C) 2003 zecke@handhelds.org
- *
- * GPL version 2
- *
- * based on arch/arm/kernel/apm.c
- * factor out the information needed by architectures to provide
- * apm status
- *
- *
- */
-#ifndef ARM_ASM_SA1100_APM_H
-#define ARM_ASM_SA1100_APM_H
-
-#include <linux/apm_bios.h>
-
-/*
- * This structure gets filled in by the machine specific 'get_power_status'
- * implementation. Any fields which are not set default to a safe value.
- */
-struct apm_power_info {
- unsigned char ac_line_status;
-#define APM_AC_OFFLINE 0
-#define APM_AC_ONLINE 1
-#define APM_AC_BACKUP 2
-#define APM_AC_UNKNOWN 0xff
-
- unsigned char battery_status;
-#define APM_BATTERY_STATUS_HIGH 0
-#define APM_BATTERY_STATUS_LOW 1
-#define APM_BATTERY_STATUS_CRITICAL 2
-#define APM_BATTERY_STATUS_CHARGING 3
-#define APM_BATTERY_STATUS_NOT_PRESENT 4
-#define APM_BATTERY_STATUS_UNKNOWN 0xff
-
- unsigned char battery_flag;
-#define APM_BATTERY_FLAG_HIGH (1 << 0)
-#define APM_BATTERY_FLAG_LOW (1 << 1)
-#define APM_BATTERY_FLAG_CRITICAL (1 << 2)
-#define APM_BATTERY_FLAG_CHARGING (1 << 3)
-#define APM_BATTERY_FLAG_NOT_PRESENT (1 << 7)
-#define APM_BATTERY_FLAG_UNKNOWN 0xff
-
- int battery_life;
- int time;
- int units;
-#define APM_UNITS_MINS 0
-#define APM_UNITS_SECS 1
-#define APM_UNITS_UNKNOWN -1
-
-};
-
-/*
- * This allows machines to provide their own "apm get power status" function.
- */
-extern void (*apm_get_power_status)(struct apm_power_info *);
-
-/*
- * Queue an event (APM_SYS_SUSPEND or APM_CRITICAL_SUSPEND)
- */
-void apm_queue_event(apm_event_t event);
-
-#endif
+++ /dev/null
-/*
- * Copyright 2006 (c) Andriy Skulysh <askulysh@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- */
-
-#ifndef __ASM_SH_APM_H
-#define __ASM_SH_APM_H
-
-#define APM_AC_OFFLINE 0
-#define APM_AC_ONLINE 1
-#define APM_AC_BACKUP 2
-#define APM_AC_UNKNOWN 0xff
-
-#define APM_BATTERY_STATUS_HIGH 0
-#define APM_BATTERY_STATUS_LOW 1
-#define APM_BATTERY_STATUS_CRITICAL 2
-#define APM_BATTERY_STATUS_CHARGING 3
-#define APM_BATTERY_STATUS_NOT_PRESENT 4
-#define APM_BATTERY_STATUS_UNKNOWN 0xff
-
-#define APM_BATTERY_LIFE_UNKNOWN 0xFFFF
-#define APM_BATTERY_LIFE_MINUTES 0x8000
-#define APM_BATTERY_LIFE_VALUE_MASK 0x7FFF
-
-#define APM_BATTERY_FLAG_HIGH (1 << 0)
-#define APM_BATTERY_FLAG_LOW (1 << 1)
-#define APM_BATTERY_FLAG_CRITICAL (1 << 2)
-#define APM_BATTERY_FLAG_CHARGING (1 << 3)
-#define APM_BATTERY_FLAG_NOT_PRESENT (1 << 7)
-#define APM_BATTERY_FLAG_UNKNOWN 0xff
-
-#define APM_UNITS_MINS 0
-#define APM_UNITS_SECS 1
-#define APM_UNITS_UNKNOWN -1
-
-
-extern int (*apm_get_info)(char *buf, char **start, off_t fpos, int length);
-extern int apm_suspended;
-
-void apm_queue_event(apm_event_t event);
-
-#endif
* based on arch/arm/kernel/apm.c
* factor out the information needed by architectures to provide
* apm status
- *
- *
*/
-#ifndef MIPS_ASM_SA1100_APM_H
-#define MIPS_ASM_SA1100_APM_H
+#ifndef __LINUX_APM_EMULATION_H
+#define __LINUX_APM_EMULATION_H
#include <linux/apm_bios.h>
*/
void apm_queue_event(apm_event_t event);
-#endif
+#endif /* __LINUX_APM_EMULATION_H */
bool
depends on HOTPLUG_CPU && X86 && PM
default y
+
+config APM_EMULATION
+ tristate "Advanced Power Management Emulation"
+ depends on PM && SYS_SUPPORTS_APM_EMULATION
+ help
+ APM is a BIOS specification for saving power using several different
+ techniques. This is mostly useful for battery powered laptops with
+ APM compliant BIOSes. If you say Y here, the system time will be
+ reset after a RESUME operation, the /proc/apm device will provide
+ battery status information, and user-space programs will receive
+ notification of APM "events" (e.g. battery status change).
+
+ In order to use APM, you will need supporting software. For location
+ and more information, read <file:Documentation/pm.txt> and the
+ Battery Powered Linux mini-HOWTO, available from
+ <http://www.tldp.org/docs.html#howto>.
+
+ This driver does not spin down disk drives (see the hdparm(8)
+ manpage ("man 8 hdparm") for that), and it doesn't turn off
+ VESA-compliant "green" monitors.
+
+ Generally, if you don't have a battery in your machine, there isn't
+ much point in using this driver and you should say N. If you get
+ random kernel OOPSes or reboots that don't seem to be related to
+ anything, try disabling/enabling this option (or disabling/enabling
+ APM in your BIOS).
git.samba.org / sfrench / cifs-2.6.git / commitdiff