/** * 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. * @system_state: System state to choose the device state for. */ static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, u32 system_state) { int ret, state; if (!acpi_device_power_manageable(adev)) return 0; ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); return ret ? ret : acpi_device_set_power(adev, state); }
/** * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. * @dev: Device whose preferred target power state to return. * @d_min_p: Location to store the upper limit of the allowed states range. * @d_max_in: Deepest low-power state to take into consideration. * Return value: Preferred power state of the device on success, -ENODEV * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is * incorrect, or -ENODATA on ACPI method failure. * * The caller must ensure that @dev is valid before using this function. */ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) { struct acpi_device *adev; int ret, d_min, d_max; if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) return -EINVAL; if (d_max_in > ACPI_STATE_D3_HOT) { enum pm_qos_flags_status stat; stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); if (stat == PM_QOS_FLAGS_ALL) d_max_in = ACPI_STATE_D3_HOT; } adev = ACPI_COMPANION(dev); if (!adev) { dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); return -ENODEV; } ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), &d_min, &d_max); if (ret) return ret; if (d_max_in < d_min) return -EINVAL; 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; } } if (d_min_p) *d_min_p = d_min; return d_max; }
/** * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. * @dev: Device whose preferred target power state to return. * @d_min_p: Location to store the upper limit of the allowed states range. * @d_max_in: Deepest low-power state to take into consideration. * Return value: Preferred power state of the device on success, -ENODEV * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is * incorrect, or -ENODATA on ACPI method failure. * * The caller must ensure that @dev is valid before using this function. */ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) { acpi_handle handle = ACPI_HANDLE(dev); struct acpi_device *adev; int ret, d_min, d_max; if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) return -EINVAL; if (d_max_in > ACPI_STATE_D3_HOT) { enum pm_qos_flags_status stat; stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); if (stat == PM_QOS_FLAGS_ALL) d_max_in = ACPI_STATE_D3_HOT; } if (!handle || acpi_bus_get_device(handle, &adev)) { dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); return -ENODEV; } ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), &d_min, &d_max); if (ret) return ret; if (d_max_in < d_min) return -EINVAL; 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; } } if (d_min_p) *d_min_p = d_min; return d_max; }
/** * acpi_subsys_prepare - Prepare device for system transition to a sleep state. * @dev: Device to prepare. */ 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; }