int acpi_bus_init_power(struct acpi_device *device) { int state; int result; if (!device) return -EINVAL; device->power.state = ACPI_STATE_UNKNOWN; result = acpi_device_get_power(device, &state); if (result) return result; if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { result = acpi_power_on_resources(device, state); if (result) return result; result = acpi_dev_pm_explicit_set(device, state); if (result) return result; } else if (state == ACPI_STATE_UNKNOWN) { /* No power resources and missing _PSC? Try to force D0. */ state = ACPI_STATE_D0; result = acpi_dev_pm_explicit_set(device, state); if (result) return result; } device->power.state = state; return 0; }
/** * acpi_device_fix_up_power - Force device with missing _PSC into D0. * @device: Device object whose power state is to be fixed up. * * Devices without power resources and _PSC, but having _PS0 and _PS3 defined, * are assumed to be put into D0 by the BIOS. However, in some cases that may * not be the case and this function should be used then. */ int acpi_device_fix_up_power(struct acpi_device *device) { int ret = 0; if (!device->power.flags.power_resources && !device->power.flags.explicit_get && device->power.state == ACPI_STATE_D0) ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); return ret; }
int acpi_bus_init_power(struct acpi_device *device) { int state; int result; if (!device) return -EINVAL; device->power.state = ACPI_STATE_UNKNOWN; if (!acpi_device_is_present(device)) return -ENXIO; result = acpi_device_get_power(device, &state); if (result) return result; if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { /* Reference count the power resources. */ result = acpi_power_on_resources(device, state); if (result) return result; if (state == ACPI_STATE_D0) { /* * If _PSC is not present and the state inferred from * power resources appears to be D0, it still may be * necessary to execute _PS0 at this point, because * another device using the same power resources may * have been put into D0 previously and that's why we * see D0 here. */ result = acpi_dev_pm_explicit_set(device, state); if (result) return result; } } else if (state == ACPI_STATE_UNKNOWN) { /* * No power resources and missing _PSC? Cross fingers and make * it D0 in hope that this is what the BIOS put the device into. * [We tried to force D0 here by executing _PS0, but that broke * Toshiba P870-303 in a nasty way.] */ state = ACPI_STATE_D0; } device->power.state = state; return 0; }
int acpi_bus_init_power(struct acpi_device *device) { int state; int result; if (!device) return -EINVAL; device->power.state = ACPI_STATE_UNKNOWN; if (!acpi_device_is_present(device)) return -ENXIO; result = acpi_device_get_power(device, &state); if (result) return result; if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { result = acpi_power_on_resources(device, state); if (result) return result; result = acpi_dev_pm_explicit_set(device, state); if (result) return result; } else if (state == ACPI_STATE_UNKNOWN) { /* * No power resources and missing _PSC? Cross fingers and make * it D0 in hope that this is what the BIOS put the device into. * [We tried to force D0 here by executing _PS0, but that broke * Toshiba P870-303 in a nasty way.] */ state = ACPI_STATE_D0; } device->power.state = state; return 0; }
/** * acpi_device_set_power - Set power state of an ACPI device. * @device: Device to set the power state of. * @state: New power state to set. * * Callers must ensure that the device is power manageable before using this * function. */ int acpi_device_set_power(struct acpi_device *device, int state) { int result = 0; bool cut_power = false; if (!device || !device->flags.power_manageable || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) return -EINVAL; /* Make sure this is a valid target state */ if (state == device->power.state) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", device->pnp.bus_id, acpi_power_state_string(state))); return 0; } if (!device->power.states[state].flags.valid) { dev_warn(&device->dev, "Power state %s not supported\n", acpi_power_state_string(state)); return -ENODEV; } 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), acpi_power_state_string(device->parent->power.state)); return -ENODEV; } /* For D3cold we should first transition into D3hot. */ if (state == ACPI_STATE_D3_COLD && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) { state = ACPI_STATE_D3_HOT; cut_power = true; } if (state < device->power.state && state != ACPI_STATE_D0 && device->power.state >= ACPI_STATE_D3_HOT) { dev_warn(&device->dev, "Cannot transition to non-D0 state from D3\n"); return -ENODEV; } /* * Transition Power * ---------------- * In accordance with the ACPI specification first apply power (via * power resources) and then evaluate _PSx. */ if (device->power.flags.power_resources) { result = acpi_power_transition(device, state); if (result) goto end; } result = acpi_dev_pm_explicit_set(device, state); if (result) goto end; if (cut_power) { device->power.state = state; state = ACPI_STATE_D3_COLD; result = acpi_power_transition(device, state); } end: if (result) { dev_warn(&device->dev, "Failed to change power state to %s\n", acpi_power_state_string(state)); } else { device->power.state = state; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to %s\n", device->pnp.bus_id, acpi_power_state_string(state))); } return result; }
/** * acpi_device_set_power - Set power state of an ACPI device. * @device: Device to set the power state of. * @state: New power state to set. * * Callers must ensure that the device is power manageable before using this * function. */ int acpi_device_set_power(struct acpi_device *device, int state) { int target_state = state; int result = 0; if (!device || !device->flags.power_manageable || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) return -EINVAL; /* Make sure this is a valid target state */ if (state == device->power.state) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", device->pnp.bus_id, acpi_power_state_string(state))); return 0; } if (state == ACPI_STATE_D3_COLD) { /* * For transitions to D3cold we need to execute _PS3 and then * possibly drop references to the power resources in use. */ state = ACPI_STATE_D3_HOT; /* If _PR3 is not available, use D3hot as the target state. */ if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) target_state = state; } else if (!device->power.states[state].flags.valid) { dev_warn(&device->dev, "Power state %s not supported\n", acpi_power_state_string(state)); return -ENODEV; } 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), acpi_power_state_string(device->parent->power.state)); return -ENODEV; } /* * Transition Power * ---------------- * In accordance with ACPI 6, _PSx is executed before manipulating power * resources, unless the target state is D0, in which case _PS0 is * supposed to be executed after turning the power resources on. */ if (state > ACPI_STATE_D0) { /* * According to ACPI 6, devices cannot go from lower-power * (deeper) states to higher-power (shallower) states. */ if (state < device->power.state) { dev_warn(&device->dev, "Cannot transition from %s to %s\n", acpi_power_state_string(device->power.state), acpi_power_state_string(state)); return -ENODEV; } result = acpi_dev_pm_explicit_set(device, state); if (result) goto end; if (device->power.flags.power_resources) result = acpi_power_transition(device, target_state); } else { if (device->power.flags.power_resources) { result = acpi_power_transition(device, ACPI_STATE_D0); if (result) goto end; } result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); } end: if (result) { dev_warn(&device->dev, "Failed to change power state to %s\n", acpi_power_state_string(state)); } else { device->power.state = target_state; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to %s\n", device->pnp.bus_id, acpi_power_state_string(state))); } return result; }
/** * acpi_device_set_power - Set power state of an ACPI device. * @device: Device to set the power state of. * @state: New power state to set. * * Callers must ensure that the device is power manageable before using this * function. */ int acpi_device_set_power(struct acpi_device *device, int state) { int result = 0; bool cut_power = false; if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) return -EINVAL; /* Make sure this is a valid target state */ if (state == device->power.state) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n", acpi_power_state_string(state))); return 0; } if (!device->power.states[state].flags.valid) { printk(KERN_WARNING PREFIX "Device does not support %s\n", acpi_power_state_string(state)); return -ENODEV; } if (device->parent && (state < device->parent->power.state)) { printk(KERN_WARNING PREFIX "Cannot set device to a higher-powered" " state than parent\n"); return -ENODEV; } /* For D3cold we should first transition into D3hot. */ if (state == ACPI_STATE_D3_COLD && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) { state = ACPI_STATE_D3_HOT; cut_power = true; } if (state < device->power.state && state != ACPI_STATE_D0 && device->power.state >= ACPI_STATE_D3_HOT) { printk(KERN_WARNING PREFIX "Cannot transition to non-D0 state from D3\n"); return -ENODEV; } /* * Transition Power * ---------------- * In accordance with the ACPI specification first apply power (via * power resources) and then evalute _PSx. */ if (device->power.flags.power_resources) { result = acpi_power_transition(device, state); if (result) goto end; } result = acpi_dev_pm_explicit_set(device, state); if (result) goto end; if (cut_power) { device->power.state = state; state = ACPI_STATE_D3_COLD; result = acpi_power_transition(device, state); } end: if (result) { printk(KERN_WARNING PREFIX "Device [%s] failed to transition to %s\n", device->pnp.bus_id, acpi_power_state_string(state)); } else { device->power.state = state; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to %s\n", device->pnp.bus_id, acpi_power_state_string(state))); } return result; }