diff options
Diffstat (limited to 'drivers/acpi/device_pm.c')
| -rw-r--r-- | drivers/acpi/device_pm.c | 197 |
1 files changed, 104 insertions, 93 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 59d3202f6b3..49a51277f81 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -22,16 +22,12 @@ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ -#include <linux/device.h> +#include <linux/acpi.h> #include <linux/export.h> #include <linux/mutex.h> #include <linux/pm_qos.h> #include <linux/pm_runtime.h> -#include <acpi/acpi.h> -#include <acpi/acpi_bus.h> -#include <acpi/acpi_drivers.h> - #include "internal.h" #define _COMPONENT ACPI_POWER_COMPONENT @@ -118,9 +114,10 @@ int acpi_device_get_power(struct acpi_device *device, int *state) /* * If we were unsure about the device parent's power state up to this * point, the fact that the device is in D0 implies that the parent has - * to be in D0 too. + * to be in D0 too, except if ignore_parent is set. */ - if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN + if (!device->power.flags.ignore_parent && device->parent + && device->parent->power.state == ACPI_STATE_UNKNOWN && result == ACPI_STATE_D0) device->parent->power.state = ACPI_STATE_D0; @@ -177,7 +174,8 @@ int acpi_device_set_power(struct acpi_device *device, int state) acpi_power_state_string(state)); return -ENODEV; } - if (device->parent && (state < device->parent->power.state)) { + if (!device->power.flags.ignore_parent && + device->parent && (state < device->parent->power.state)) { dev_warn(&device->dev, "Cannot transition to power state %s for parent in %s\n", acpi_power_state_string(state), @@ -258,6 +256,8 @@ int acpi_bus_init_power(struct acpi_device *device) return -EINVAL; device->power.state = ACPI_STATE_UNKNOWN; + if (!acpi_device_is_present(device)) + return 0; result = acpi_device_get_power(device, &state); if (result) @@ -304,15 +304,18 @@ int acpi_device_fix_up_power(struct acpi_device *device) return ret; } -int acpi_bus_update_power(acpi_handle handle, int *state_p) +int acpi_device_update_power(struct acpi_device *device, int *state_p) { - struct acpi_device *device; int state; int result; - result = acpi_bus_get_device(handle, &device); - if (result) + if (device->power.state == ACPI_STATE_UNKNOWN) { + result = acpi_bus_init_power(device); + if (!result && state_p) + *state_p = device->power.state; + return result; + } result = acpi_device_get_power(device, &state); if (result) @@ -340,6 +343,15 @@ int acpi_bus_update_power(acpi_handle handle, int *state_p) return 0; } + +int acpi_bus_update_power(acpi_handle handle, int *state_p) +{ + struct acpi_device *device; + int result; + + result = acpi_bus_get_device(handle, &device); + return result ? result : acpi_device_update_power(device, state_p); +} EXPORT_SYMBOL_GPL(acpi_bus_update_power); bool acpi_bus_power_manageable(acpi_handle handle) @@ -546,7 +558,7 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, */ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) { - acpi_handle handle = DEVICE_ACPI_HANDLE(dev); + acpi_handle handle = ACPI_HANDLE(dev); struct acpi_device *adev; int ret, d_min, d_max; @@ -654,7 +666,7 @@ int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) if (!device_run_wake(phys_dev)) return -EINVAL; - handle = DEVICE_ACPI_HANDLE(phys_dev); + handle = ACPI_HANDLE(phys_dev); if (!handle || acpi_bus_get_device(handle, &adev)) { dev_dbg(phys_dev, "ACPI handle without context in %s!\n", __func__); @@ -698,7 +710,7 @@ int acpi_pm_device_sleep_wake(struct device *dev, bool enable) if (!device_can_wakeup(dev)) return -EINVAL; - handle = DEVICE_ACPI_HANDLE(dev); + handle = ACPI_HANDLE(dev); if (!handle || acpi_bus_get_device(handle, &adev)) { dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); return -ENODEV; @@ -715,18 +727,6 @@ int acpi_pm_device_sleep_wake(struct device *dev, bool enable) #endif /* CONFIG_PM_SLEEP */ /** - * acpi_dev_pm_get_node - Get ACPI device node for the given physical device. - * @dev: Device to get the ACPI node for. - */ -struct acpi_device *acpi_dev_pm_get_node(struct device *dev) -{ - acpi_handle handle = DEVICE_ACPI_HANDLE(dev); - struct acpi_device *adev; - - return handle && !acpi_bus_get_device(handle, &adev) ? adev : NULL; -} - -/** * acpi_dev_pm_low_power - Put ACPI device into a low-power state. * @dev: Device to put into a low-power state. * @adev: ACPI device node corresponding to @dev. @@ -766,7 +766,7 @@ static int acpi_dev_pm_full_power(struct acpi_device *adev) */ int acpi_dev_runtime_suspend(struct device *dev) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); bool remote_wakeup; int error; @@ -797,7 +797,7 @@ EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); */ int acpi_dev_runtime_resume(struct device *dev) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); int error; if (!adev) @@ -850,7 +850,7 @@ EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); */ int acpi_dev_suspend_late(struct device *dev) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); u32 target_state; bool wakeup; int error; @@ -882,7 +882,7 @@ EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); */ int acpi_dev_resume_early(struct device *dev) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); int error; if (!adev) @@ -900,14 +900,59 @@ EXPORT_SYMBOL_GPL(acpi_dev_resume_early); */ int acpi_subsys_prepare(struct device *dev) { + struct acpi_device *adev = ACPI_COMPANION(dev); + u32 sys_target; + int ret, state; + + ret = pm_generic_prepare(dev); + if (ret < 0) + return ret; + + if (!adev || !pm_runtime_suspended(dev) + || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) + return 0; + + sys_target = acpi_target_system_state(); + if (sys_target == ACPI_STATE_S0) + return 1; + + if (adev->power.flags.dsw_present) + return 0; + + ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); + return !ret && state == adev->power.state; +} +EXPORT_SYMBOL_GPL(acpi_subsys_prepare); + +/** + * acpi_subsys_complete - Finalize device's resume during system resume. + * @dev: Device to handle. + */ +void acpi_subsys_complete(struct device *dev) +{ /* - * Follow PCI and resume devices suspended at run time before running - * their system suspend callbacks. + * If the device had been runtime-suspended before the system went into + * the sleep state it is going out of and it has never been resumed till + * now, resume it in case the firmware powered it up. */ + if (dev->power.direct_complete) + pm_request_resume(dev); +} +EXPORT_SYMBOL_GPL(acpi_subsys_complete); + +/** + * acpi_subsys_suspend - Run the device driver's suspend callback. + * @dev: Device to handle. + * + * Follow PCI and resume devices suspended at run time before running their + * system suspend callbacks. + */ +int acpi_subsys_suspend(struct device *dev) +{ pm_runtime_resume(dev); - return pm_generic_prepare(dev); + return pm_generic_suspend(dev); } -EXPORT_SYMBOL_GPL(acpi_subsys_prepare); +EXPORT_SYMBOL_GPL(acpi_subsys_suspend); /** * acpi_subsys_suspend_late - Suspend device using ACPI. @@ -937,6 +982,24 @@ int acpi_subsys_resume_early(struct device *dev) return ret ? ret : pm_generic_resume_early(dev); } EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); + +/** + * acpi_subsys_freeze - Run the device driver's freeze callback. + * @dev: Device to handle. + */ +int acpi_subsys_freeze(struct device *dev) +{ + /* + * This used to be done in acpi_subsys_prepare() for all devices and + * some drivers may depend on it, so do it here. Ideally, however, + * runtime-suspended devices should not be touched during freeze/thaw + * transitions. + */ + pm_runtime_resume(dev); + return pm_generic_freeze(dev); +} +EXPORT_SYMBOL_GPL(acpi_subsys_freeze); + #endif /* CONFIG_PM_SLEEP */ static struct dev_pm_domain acpi_general_pm_domain = { @@ -947,8 +1010,12 @@ static struct dev_pm_domain acpi_general_pm_domain = { #endif #ifdef CONFIG_PM_SLEEP .prepare = acpi_subsys_prepare, + .complete = acpi_subsys_complete, + .suspend = acpi_subsys_suspend, .suspend_late = acpi_subsys_suspend_late, .resume_early = acpi_subsys_resume_early, + .freeze = acpi_subsys_freeze, + .poweroff = acpi_subsys_suspend, .poweroff_late = acpi_subsys_suspend_late, .restore_early = acpi_subsys_resume_early, #endif @@ -973,7 +1040,7 @@ static struct dev_pm_domain acpi_general_pm_domain = { */ int acpi_dev_pm_attach(struct device *dev, bool power_on) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); if (!adev) return -ENODEV; @@ -1005,7 +1072,7 @@ EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); */ void acpi_dev_pm_detach(struct device *dev, bool power_off) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); if (adev && dev->pm_domain == &acpi_general_pm_domain) { dev->pm_domain = NULL; @@ -1025,60 +1092,4 @@ void acpi_dev_pm_detach(struct device *dev, bool power_off) } } EXPORT_SYMBOL_GPL(acpi_dev_pm_detach); - -/** - * acpi_dev_pm_add_dependent - Add physical device depending for PM. - * @handle: Handle of ACPI device node. - * @depdev: Device depending on that node for PM. - */ -void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev) -{ - struct acpi_device_physical_node *dep; - struct acpi_device *adev; - - if (!depdev || acpi_bus_get_device(handle, &adev)) - return; - - mutex_lock(&adev->physical_node_lock); - - list_for_each_entry(dep, &adev->power_dependent, node) - if (dep->dev == depdev) - goto out; - - dep = kzalloc(sizeof(*dep), GFP_KERNEL); - if (dep) { - dep->dev = depdev; - list_add_tail(&dep->node, &adev->power_dependent); - } - - out: - mutex_unlock(&adev->physical_node_lock); -} -EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent); - -/** - * acpi_dev_pm_remove_dependent - Remove physical device depending for PM. - * @handle: Handle of ACPI device node. - * @depdev: Device depending on that node for PM. - */ -void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev) -{ - struct acpi_device_physical_node *dep; - struct acpi_device *adev; - - if (!depdev || acpi_bus_get_device(handle, &adev)) - return; - - mutex_lock(&adev->physical_node_lock); - - list_for_each_entry(dep, &adev->power_dependent, node) - if (dep->dev == depdev) { - list_del(&dep->node); - kfree(dep); - break; - } - - mutex_unlock(&adev->physical_node_lock); -} -EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent); #endif /* CONFIG_PM */ |