diff options
Diffstat (limited to 'drivers/acpi/bus.c')
| -rw-r--r-- | drivers/acpi/bus.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index e0596954290b..1f0d457ecbcf 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -257,7 +257,15 @@ static int __acpi_bus_get_power(struct acpi_device *device, int *state) } -static int __acpi_bus_set_power(struct acpi_device *device, int state) +/** + * 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; acpi_status status = AE_OK; @@ -298,6 +306,12 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state) * a lower-powered state. */ if (state < device->power.state) { + if (device->power.state >= ACPI_STATE_D3_HOT && + state != ACPI_STATE_D0) { + printk(KERN_WARNING PREFIX + "Cannot transition to non-D0 state from D3\n"); + return -ENODEV; + } if (device->power.flags.power_resources) { result = acpi_power_transition(device, state); if (result) @@ -341,6 +355,7 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state) return result; } +EXPORT_SYMBOL(acpi_device_set_power); int acpi_bus_set_power(acpi_handle handle, int state) @@ -359,7 +374,7 @@ int acpi_bus_set_power(acpi_handle handle, int state) return -ENODEV; } - return __acpi_bus_set_power(device, state); + return acpi_device_set_power(device, state); } EXPORT_SYMBOL(acpi_bus_set_power); @@ -402,7 +417,7 @@ int acpi_bus_update_power(acpi_handle handle, int *state_p) if (result) return result; - result = __acpi_bus_set_power(device, state); + result = acpi_device_set_power(device, state); if (!result && state_p) *state_p = state; @@ -994,8 +1009,6 @@ static int __init acpi_bus_init(void) status = acpi_ec_ecdt_probe(); /* Ignore result. Not having an ECDT is not fatal. */ - acpi_bus_osc_support(); - status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); @@ -1003,6 +1016,12 @@ static int __init acpi_bus_init(void) } /* + * _OSC method may exist in module level code, + * so it must be run after ACPI_FULL_INITIALIZATION + */ + acpi_bus_osc_support(); + + /* * _PDC control method may load dynamic SSDT tables, * and we need to install the table handler before that. */ |