diff options
| -rw-r--r-- | drivers/rtc/rtc-cmos.c | 37 | ||||
| -rw-r--r-- | include/linux/mc146818rtc.h | 7 |
2 files changed, 34 insertions, 10 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index 4e8c373f78e..3fbfdd16191 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -46,6 +46,10 @@ struct cmos_rtc { int irq; struct resource *iomem; + void (*wake_on)(struct device *); + void (*wake_off)(struct device *); + + u8 enabled_wake; u8 suspend_ctrl; /* newer hardware extends the original register set */ @@ -405,13 +409,20 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) cmos_rtc.irq = rtc_irq; cmos_rtc.iomem = ports; - /* For ACPI systems the info comes from the FADT. On others, - * board specific setup provides it as appropriate. + /* For ACPI systems extension info comes from the FADT. On others, + * board specific setup provides it as appropriate. Systems where + * the alarm IRQ isn't automatically a wakeup IRQ (like ACPI, and + * some almost-clones) can provide hooks to make that behave. */ if (info) { cmos_rtc.day_alrm = info->rtc_day_alarm; cmos_rtc.mon_alrm = info->rtc_mon_alarm; cmos_rtc.century = info->rtc_century; + + if (info->wake_on && info->wake_off) { + cmos_rtc.wake_on = info->wake_on; + cmos_rtc.wake_off = info->wake_off; + } } cmos_rtc.rtc = rtc_device_register(driver_name, dev, @@ -559,9 +570,13 @@ static int cmos_suspend(struct device *dev, pm_message_t mesg) } spin_unlock_irq(&rtc_lock); - /* ACPI HOOK: enable ACPI_EVENT_RTC when (tmp & RTC_AIE) - * ... it'd be best if we could do that under rtc_lock. - */ + if (tmp & RTC_AIE) { + cmos->enabled_wake = 1; + if (cmos->wake_on) + cmos->wake_on(dev); + else + enable_irq_wake(cmos->irq); + } pr_debug("%s: suspend%s, ctrl %02x\n", cmos_rtc.rtc->dev.bus_id, @@ -576,14 +591,16 @@ static int cmos_resume(struct device *dev) struct cmos_rtc *cmos = dev_get_drvdata(dev); unsigned char tmp = cmos->suspend_ctrl; - /* REVISIT: a mechanism to resync the system clock (jiffies) - * on resume should be portable between platforms ... - */ - /* re-enable any irqs previously active */ if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) { - /* ACPI HOOK: disable ACPI_EVENT_RTC when (tmp & RTC_AIE) */ + if (cmos->enabled_wake) { + if (cmos->wake_off) + cmos->wake_off(dev); + else + disable_irq_wake(cmos->irq); + cmos->enabled_wake = 0; + } spin_lock_irq(&rtc_lock); CMOS_WRITE(tmp, RTC_CONTROL); diff --git a/include/linux/mc146818rtc.h b/include/linux/mc146818rtc.h index bdc01127dce..580b3f4956e 100644 --- a/include/linux/mc146818rtc.h +++ b/include/linux/mc146818rtc.h @@ -22,8 +22,15 @@ extern spinlock_t rtc_lock; /* serialize CMOS RAM access */ /* Some RTCs extend the mc146818 register set to support alarms of more * than 24 hours in the future; or dates that include a century code. * This platform_data structure can pass this information to the driver. + * + * Also, some platforms need suspend()/resume() hooks to kick in special + * handling of wake alarms, e.g. activating ACPI BIOS hooks or setting up + * a separate wakeup alarm used by some almost-clone chips. */ struct cmos_rtc_board_info { + void (*wake_on)(struct device *dev); + void (*wake_off)(struct device *dev); + u8 rtc_day_alarm; /* zero, or register index */ u8 rtc_mon_alarm; /* zero, or register index */ u8 rtc_century; /* zero, or register index */ |