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Merge back earlier suspend/hibernate material for v4.1.

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This commit is contained in:
Rafael J. Wysocki 2015-04-10 12:01:59 +02:00
commit be77002101
9 changed files with 106 additions and 22 deletions
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51
drivers/watchdog/iTCO_wdt.c
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@ -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,
},
};