diff options
Diffstat (limited to 'drivers/acpi/sleep.c')
| -rw-r--r-- | drivers/acpi/sleep.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index bd35e3c5e530..fdcdbb652915 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -29,7 +29,6 @@ #include "sleep.h" static u8 sleep_states[ACPI_S_STATE_COUNT]; -static bool pwr_btn_event_pending; static void acpi_sleep_tts_switch(u32 acpi_state) { @@ -82,6 +81,7 @@ static int acpi_sleep_prepare(u32 acpi_state) #ifdef CONFIG_ACPI_SLEEP static u32 acpi_target_sleep_state = ACPI_STATE_S0; +static bool pwr_btn_event_pending; /* * The ACPI specification wants us to save NVS memory regions during hibernation @@ -688,8 +688,9 @@ int acpi_suspend(u32 acpi_state) * @dev: device to examine; its driver model wakeup flags control * whether it should be able to wake up the system * @d_min_p: used to store the upper limit of allowed states range - * Return value: preferred power state of the device on success, -ENODEV on - * failure (ie. if there's no 'struct acpi_device' for @dev) + * @d_max_in: specify the lowest allowed states + * Return value: preferred power state of the device on success, -ENODEV + * (ie. if there's no 'struct acpi_device' for @dev) or -EINVAL on failure * * Find the lowest power (highest number) ACPI device power state that * device @dev can be in while the system is in the sleep state represented @@ -704,13 +705,15 @@ int acpi_suspend(u32 acpi_state) * via @wake. */ -int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) +int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) { acpi_handle handle = DEVICE_ACPI_HANDLE(dev); struct acpi_device *adev; char acpi_method[] = "_SxD"; unsigned long long d_min, d_max; + if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3) + return -EINVAL; if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { printk(KERN_DEBUG "ACPI handle has no context!\n"); return -ENODEV; @@ -718,8 +721,10 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) acpi_method[2] = '0' + acpi_target_sleep_state; /* - * If the sleep state is S0, we will return D3, but if the device has - * _S0W, we will use the value from _S0W + * If the sleep state is S0, the lowest limit from ACPI is D3, + * but if the device has _S0W, we will use the value from _S0W + * as the lowest limit from ACPI. Finally, we will constrain + * the lowest limit with the specified one. */ d_min = ACPI_STATE_D0; d_max = ACPI_STATE_D3; @@ -763,10 +768,20 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) } } + if (d_max_in < d_min) + return -EINVAL; if (d_min_p) *d_min_p = d_min; + /* constrain d_max with specified lowest limit (max number) */ + if (d_max > d_max_in) { + for (d_max = d_max_in; d_max > d_min; d_max--) { + if (adev->power.states[d_max].flags.valid) + break; + } + } return d_max; } +EXPORT_SYMBOL(acpi_pm_device_sleep_state); #endif /* CONFIG_PM */ #ifdef CONFIG_PM_SLEEP @@ -803,6 +818,7 @@ int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) return 0; } +EXPORT_SYMBOL(acpi_pm_device_run_wake); /** * acpi_pm_device_sleep_wake - enable or disable the system wake-up |