diff options
Diffstat (limited to 'drivers/acpi/glue.c')
| -rw-r--r-- | drivers/acpi/glue.c | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c index 4334c208841a..41427a41f620 100644 --- a/drivers/acpi/glue.c +++ b/drivers/acpi/glue.c @@ -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 +312,24 @@ 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; + + /* workaround bug in some ACPI tables */ + if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) { + DBG("bogus FADT month_alarm\n"); + acpi_gbl_FADT.month_alarm = 0; + } + 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(PREFIX "RTC can wake from S4\n"); + dev->platform_data = &rtc_info; @@ -296,7 +338,7 @@ static int __init acpi_rtc_init(void) put_device(dev); } else - pr_debug("ACPI: RTC unavailable?\n"); + DBG("RTC unavailable?\n"); return 0; } /* do this between RTC subsys_initcall() and rtc_cmos driver_initcall() */ |