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ACPI / PM: Common string representations of device power states

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The function returning string representations of ACPI device power
states, state_string((), is now static, because it is only used
internally in drivers/acpi/bus.c.  However, it will be used outside
of that file going forward, so rename it to
acpi_power_state_string(), add a kerneldoc comment to it and add its
header to acpi_bus.h.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2013-01-17 14:11:08 +01:00
parent ad0c3b0e48
commit 96bfd3cee2
2 changed files with 13 additions and 6 deletions
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18
drivers/acpi/bus.c
View File

@ -182,7 +182,11 @@ EXPORT_SYMBOL(acpi_bus_get_private_data);
Power Management
-------------------------------------------------------------------------- */
static const char *state_string(int state)
/**
* acpi_power_state_string - String representation of ACPI device power state.
* @state: ACPI device power state to return the string representation of.
*/
const char *acpi_power_state_string(int state)
{
switch (state) {
case ACPI_STATE_D0:
@ -260,7 +264,7 @@ int acpi_device_get_power(struct acpi_device *device, int *state)
out:
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
device->pnp.bus_id, state_string(*state)));
device->pnp.bus_id, acpi_power_state_string(*state)));
return 0;
}
@ -288,13 +292,13 @@ int acpi_device_set_power(struct acpi_device *device, int state)
if (state == device->power.state) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
state_string(state)));
acpi_power_state_string(state)));
return 0;
}
if (!device->power.states[state].flags.valid) {
printk(KERN_WARNING PREFIX "Device does not support %s\n",
state_string(state));
acpi_power_state_string(state));
return -ENODEV;
}
if (device->parent && (state < device->parent->power.state)) {
@ -362,12 +366,14 @@ int acpi_device_set_power(struct acpi_device *device, int state)
if (result)
printk(KERN_WARNING PREFIX
"Device [%s] failed to transition to %s\n",
device->pnp.bus_id, state_string(state));
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, state_string(state)));
device->pnp.bus_id,
acpi_power_state_string(state)));
}
return result;

1
include/acpi/acpi_bus.h
View File

@ -331,6 +331,7 @@ acpi_status acpi_bus_get_status_handle(acpi_handle handle,
unsigned long long *sta);
int acpi_bus_get_status(struct acpi_device *device);
int acpi_bus_set_power(acpi_handle handle, int state);
const char *acpi_power_state_string(int state);
int acpi_device_get_power(struct acpi_device *device, int *state);
int acpi_device_set_power(struct acpi_device *device, int state);
int acpi_bus_update_power(acpi_handle handle, int *state_p);