diff options
Diffstat (limited to 'drivers/watchdog/iTCO_wdt.c')
| -rw-r--r-- | drivers/watchdog/iTCO_wdt.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c index 05ee0bf88ce9..3c3fd417ddeb 100644 --- a/drivers/watchdog/iTCO_wdt.c +++ b/drivers/watchdog/iTCO_wdt.c @@ -51,6 +51,7 @@ #define DRV_VERSION "1.11" /* Includes */ +#include <linux/acpi.h> /* For ACPI support */ #include <linux/module.h> /* For module specific items */ #include <linux/moduleparam.h> /* For new moduleparam's */ #include <linux/types.h> /* For standard types (like size_t) */ @@ -103,6 +104,8 @@ static struct { /* this is private data for the iTCO_wdt device */ struct platform_device *dev; /* the PCI-device */ struct pci_dev *pdev; + /* whether or not the watchdog has been suspended */ + bool suspended; } iTCO_wdt_private; /* module parameters */ @@ -571,12 +574,60 @@ static void iTCO_wdt_shutdown(struct platform_device *dev) iTCO_wdt_stop(NULL); } +#ifdef CONFIG_PM_SLEEP +/* + * Suspend-to-idle requires this, because it stops the ticks and timekeeping, so + * the watchdog cannot be pinged while in that state. In ACPI sleep states the + * watchdog is stopped by the platform firmware. + */ + +#ifdef CONFIG_ACPI +static inline bool need_suspend(void) +{ + return acpi_target_system_state() == ACPI_STATE_S0; +} +#else +static inline bool need_suspend(void) { return true; } +#endif + +static int iTCO_wdt_suspend_noirq(struct device *dev) +{ + int ret = 0; + + iTCO_wdt_private.suspended = false; + if (watchdog_active(&iTCO_wdt_watchdog_dev) && need_suspend()) { + ret = iTCO_wdt_stop(&iTCO_wdt_watchdog_dev); + if (!ret) + iTCO_wdt_private.suspended = true; + } + return ret; +} + +static int iTCO_wdt_resume_noirq(struct device *dev) +{ + if (iTCO_wdt_private.suspended) + iTCO_wdt_start(&iTCO_wdt_watchdog_dev); + + return 0; +} + +static struct dev_pm_ops iTCO_wdt_pm = { + .suspend_noirq = iTCO_wdt_suspend_noirq, + .resume_noirq = iTCO_wdt_resume_noirq, +}; + +#define ITCO_WDT_PM_OPS (&iTCO_wdt_pm) +#else +#define ITCO_WDT_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP */ + static struct platform_driver iTCO_wdt_driver = { .probe = iTCO_wdt_probe, .remove = iTCO_wdt_remove, .shutdown = iTCO_wdt_shutdown, .driver = { .name = DRV_NAME, + .pm = ITCO_WDT_PM_OPS, }, }; |