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ACPI / scan: Move power state initialization to a separate routine

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To reduce indentation level and improve code readability, move the
initialization code related to device power states from
acpi_bus_get_power_flags() to a new routine,
acpi_bus_init_power_state().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2013-01-17 14:11:06 +01:00
parent 993cbe595d
commit f33ce56836
1 changed files with 46 additions and 41 deletions
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87
drivers/acpi/scan.c
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@ -1041,6 +1041,50 @@ static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
"error in _DSW or _PSW evaluation\n"));
}
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
struct acpi_device_power_state *ps = &device->power.states[state];
char object_name[5] = { '_', 'P', 'R', '0' + state, '\0' };
struct acpi_handle_list resources;
acpi_handle handle;
acpi_status status;
INIT_LIST_HEAD(&ps->resources);
/* Evaluate "_PRx" to se if power resources are referenced */
acpi_evaluate_reference(device->handle, object_name, NULL, &resources);
if (resources.count) {
int j;
device->power.flags.power_resources = 1;
for (j = 0; j < resources.count; j++) {
acpi_handle rhandle = resources.handles[j];
acpi_add_power_resource(rhandle);
acpi_power_resources_list_add(rhandle, &ps->resources);
}
}
/* Evaluate "_PSx" to see if we can do explicit sets */
object_name[2] = 'S';
status = acpi_get_handle(device->handle, object_name, &handle);
if (ACPI_SUCCESS(status))
ps->flags.explicit_set = 1;
/*
* State is valid if there are means to put the device into it.
* D3hot is only valid if _PR3 present.
*/
if (resources.count
|| (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
ps->flags.valid = 1;
ps->flags.os_accessible = 1;
}
ps->power = -1; /* Unknown - driver assigned */
ps->latency = -1; /* Unknown - driver assigned */
}
static void acpi_bus_get_power_flags(struct acpi_device *device)
{
acpi_status status = 0;
@ -1070,47 +1114,8 @@ static void acpi_bus_get_power_flags(struct acpi_device *device)
/*
* Enumerate supported power management states
*/
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
struct acpi_device_power_state *ps = &device->power.states[i];
char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
struct acpi_handle_list resources;
INIT_LIST_HEAD(&ps->resources);
/* Evaluate "_PRx" to se if power resources are referenced */
acpi_evaluate_reference(device->handle, object_name, NULL,
&resources);
if (resources.count) {
int j;
device->power.flags.power_resources = 1;
for (j = 0; j < resources.count; j++) {
acpi_handle rhandle = resources.handles[j];
acpi_add_power_resource(rhandle);
acpi_power_resources_list_add(rhandle,
&ps->resources);
}
}
/* Evaluate "_PSx" to see if we can do explicit sets */
object_name[2] = 'S';
status = acpi_get_handle(device->handle, object_name, &handle);
if (ACPI_SUCCESS(status))
ps->flags.explicit_set = 1;
/*
* State is valid if there are means to put the device into it.
* D3hot is only valid if _PR3 present.
*/
if (resources.count ||
(ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
ps->flags.valid = 1;
ps->flags.os_accessible = 1;
}
ps->power = -1; /* Unknown - driver assigned */
ps->latency = -1; /* Unknown - driver assigned */
}
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
acpi_bus_init_power_state(device, i);
INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);