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ACPI wakeup hooks for rtc-cmos

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Remove /proc/acpi/alarm file when the rtc-cmos "wakealarm" file is available.
Instead, provide hooks that rtc-cmos will use.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Brownell 2007-05-08 00:34:02 -07:00 committed by Linus Torvalds
parent 87ac84f42a
commit f5f72b46c3
2 changed files with 53 additions and 3 deletions
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37
drivers/acpi/glue.c
View File

@ -245,6 +245,35 @@ arch_initcall(init_acpi_device_notify);
#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
#ifdef CONFIG_PM
static u32 rtc_handler(void *context)
{
acpi_clear_event(ACPI_EVENT_RTC);
acpi_disable_event(ACPI_EVENT_RTC, 0);
return ACPI_INTERRUPT_HANDLED;
}
static inline void rtc_wake_setup(void)
{
acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
}
static void rtc_wake_on(struct device *dev)
{
acpi_clear_event(ACPI_EVENT_RTC);
acpi_enable_event(ACPI_EVENT_RTC, 0);
}
static void rtc_wake_off(struct device *dev)
{
acpi_disable_event(ACPI_EVENT_RTC, 0);
}
#else
#define rtc_wake_setup() do{}while(0)
#define rtc_wake_on NULL
#define rtc_wake_off NULL
#endif
/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
* its device node and pass extra config data. This helps its driver use
* capabilities that the now-obsolete mc146818 didn't have, and informs it
@ -283,11 +312,17 @@ static int __init acpi_rtc_init(void)
struct device *dev = get_rtc_dev();
if (dev) {
rtc_wake_setup();
rtc_info.wake_on = rtc_wake_on;
rtc_info.wake_off = rtc_wake_off;
rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
rtc_info.rtc_century = acpi_gbl_FADT.century;
/* NOTE: acpi_gbl_FADT->rtcs4 is NOT currently useful */
/* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */
if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
printk("ACPI: RTC can wake from S4\n");
dev->platform_data = &rtc_info;

19
drivers/acpi/sleep/proc.c
View File

@ -70,6 +70,14 @@ acpi_system_write_sleep(struct file *file,
}
#endif /* CONFIG_ACPI_SLEEP_PROC_SLEEP */
#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
/* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
#else
#define HAVE_ACPI_LEGACY_ALARM
#endif
#ifdef HAVE_ACPI_LEGACY_ALARM
static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
{
u32 sec, min, hr;
@ -341,6 +349,8 @@ acpi_system_write_alarm(struct file *file,
end:
return_VALUE(result ? result : count);
}
#endif /* HAVE_ACPI_LEGACY_ALARM */
extern struct list_head acpi_wakeup_device_list;
extern spinlock_t acpi_device_lock;
@ -464,6 +474,7 @@ static const struct file_operations acpi_system_sleep_fops = {
};
#endif /* CONFIG_ACPI_SLEEP_PROC_SLEEP */
#ifdef HAVE_ACPI_LEGACY_ALARM
static const struct file_operations acpi_system_alarm_fops = {
.open = acpi_system_alarm_open_fs,
.read = seq_read,
@ -479,8 +490,9 @@ static u32 rtc_handler(void *context)
return ACPI_INTERRUPT_HANDLED;
}
#endif /* HAVE_ACPI_LEGACY_ALARM */
static int acpi_sleep_proc_init(void)
static int __init acpi_sleep_proc_init(void)
{
struct proc_dir_entry *entry = NULL;
@ -496,6 +508,7 @@ static int acpi_sleep_proc_init(void)
entry->proc_fops = &acpi_system_sleep_fops;
#endif
#ifdef HAVE_ACPI_LEGACY_ALARM
/* 'alarm' [R/W] */
entry =
create_proc_entry("alarm", S_IFREG | S_IRUGO | S_IWUSR,
@ -503,6 +516,9 @@ static int acpi_sleep_proc_init(void)
if (entry)
entry->proc_fops = &acpi_system_alarm_fops;
acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
#endif /* HAVE_ACPI_LEGACY_ALARM */
/* 'wakeup device' [R/W] */
entry =
create_proc_entry("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
@ -510,7 +526,6 @@ static int acpi_sleep_proc_init(void)
if (entry)
entry->proc_fops = &acpi_system_wakeup_device_fops;
acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
return 0;
}