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ACPI / PM: Move device power management functions to device_pm.c
Move ACPI device power management functions from drivers/acpi/bus.c to drivers/acpi/device_pm.c. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
parent
96bfd3cee2
commit
9ce4e60711
@ -178,299 +178,6 @@ int acpi_bus_get_private_data(acpi_handle handle, void **data)
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}
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EXPORT_SYMBOL(acpi_bus_get_private_data);
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/* --------------------------------------------------------------------------
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Power Management
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-------------------------------------------------------------------------- */
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/**
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* acpi_power_state_string - String representation of ACPI device power state.
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* @state: ACPI device power state to return the string representation of.
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*/
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const char *acpi_power_state_string(int state)
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{
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switch (state) {
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case ACPI_STATE_D0:
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return "D0";
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case ACPI_STATE_D1:
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return "D1";
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case ACPI_STATE_D2:
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return "D2";
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case ACPI_STATE_D3_HOT:
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return "D3hot";
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case ACPI_STATE_D3_COLD:
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return "D3";
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default:
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return "(unknown)";
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}
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}
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/**
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* acpi_device_get_power - Get power state of an ACPI device.
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* @device: Device to get the power state of.
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* @state: Place to store the power state of the device.
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*
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* This function does not update the device's power.state field, but it may
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* update its parent's power.state field (when the parent's power state is
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* unknown and the device's power state turns out to be D0).
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*/
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int acpi_device_get_power(struct acpi_device *device, int *state)
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{
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int result = ACPI_STATE_UNKNOWN;
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if (!device || !state)
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return -EINVAL;
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if (!device->flags.power_manageable) {
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/* TBD: Non-recursive algorithm for walking up hierarchy. */
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*state = device->parent ?
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device->parent->power.state : ACPI_STATE_D0;
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goto out;
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}
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/*
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* Get the device's power state either directly (via _PSC) or
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* indirectly (via power resources).
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*/
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if (device->power.flags.explicit_get) {
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unsigned long long psc;
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acpi_status status = acpi_evaluate_integer(device->handle,
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"_PSC", NULL, &psc);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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result = psc;
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}
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/* The test below covers ACPI_STATE_UNKNOWN too. */
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if (result <= ACPI_STATE_D2) {
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; /* Do nothing. */
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} else if (device->power.flags.power_resources) {
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int error = acpi_power_get_inferred_state(device, &result);
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if (error)
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return error;
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} else if (result == ACPI_STATE_D3_HOT) {
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result = ACPI_STATE_D3;
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}
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/*
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* If we were unsure about the device parent's power state up to this
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* point, the fact that the device is in D0 implies that the parent has
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* to be in D0 too.
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*/
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if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
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&& result == ACPI_STATE_D0)
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device->parent->power.state = ACPI_STATE_D0;
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*state = result;
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out:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
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device->pnp.bus_id, acpi_power_state_string(*state)));
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return 0;
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}
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/**
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* acpi_device_set_power - Set power state of an ACPI device.
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* @device: Device to set the power state of.
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* @state: New power state to set.
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*
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* Callers must ensure that the device is power manageable before using this
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* function.
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*/
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int acpi_device_set_power(struct acpi_device *device, int state)
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{
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int result = 0;
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acpi_status status = AE_OK;
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char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
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bool cut_power = false;
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if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
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return -EINVAL;
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/* Make sure this is a valid target state */
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if (state == device->power.state) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
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acpi_power_state_string(state)));
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return 0;
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}
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if (!device->power.states[state].flags.valid) {
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printk(KERN_WARNING PREFIX "Device does not support %s\n",
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acpi_power_state_string(state));
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return -ENODEV;
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}
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if (device->parent && (state < device->parent->power.state)) {
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printk(KERN_WARNING PREFIX
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"Cannot set device to a higher-powered"
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" state than parent\n");
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return -ENODEV;
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}
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/* For D3cold we should first transition into D3hot. */
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if (state == ACPI_STATE_D3_COLD
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&& device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
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state = ACPI_STATE_D3_HOT;
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object_name[3] = '3';
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cut_power = true;
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}
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/*
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* Transition Power
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* ----------------
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* On transitions to a high-powered state we first apply power (via
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* power resources) then evalute _PSx. Conversly for transitions to
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* a lower-powered state.
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*/
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if (state < device->power.state) {
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if (device->power.state >= ACPI_STATE_D3_HOT &&
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state != ACPI_STATE_D0) {
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printk(KERN_WARNING PREFIX
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"Cannot transition to non-D0 state from D3\n");
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return -ENODEV;
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}
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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goto end;
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}
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if (device->power.states[state].flags.explicit_set) {
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status = acpi_evaluate_object(device->handle,
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object_name, NULL, NULL);
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if (ACPI_FAILURE(status)) {
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result = -ENODEV;
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goto end;
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}
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}
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} else {
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if (device->power.states[state].flags.explicit_set) {
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status = acpi_evaluate_object(device->handle,
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object_name, NULL, NULL);
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if (ACPI_FAILURE(status)) {
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result = -ENODEV;
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goto end;
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}
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}
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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goto end;
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}
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}
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if (cut_power)
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result = acpi_power_transition(device, ACPI_STATE_D3_COLD);
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end:
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if (result)
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printk(KERN_WARNING PREFIX
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"Device [%s] failed to transition to %s\n",
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device->pnp.bus_id,
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acpi_power_state_string(state));
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else {
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device->power.state = state;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Device [%s] transitioned to %s\n",
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device->pnp.bus_id,
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acpi_power_state_string(state)));
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}
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return result;
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}
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EXPORT_SYMBOL(acpi_device_set_power);
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int acpi_bus_set_power(acpi_handle handle, int state)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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if (result)
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return result;
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if (!device->flags.power_manageable) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Device [%s] is not power manageable\n",
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dev_name(&device->dev)));
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return -ENODEV;
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}
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return acpi_device_set_power(device, state);
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}
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EXPORT_SYMBOL(acpi_bus_set_power);
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int acpi_bus_init_power(struct acpi_device *device)
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{
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int state;
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int result;
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if (!device)
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return -EINVAL;
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device->power.state = ACPI_STATE_UNKNOWN;
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result = acpi_device_get_power(device, &state);
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if (result)
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return result;
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if (device->power.flags.power_resources)
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result = acpi_power_on_resources(device, state);
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if (!result)
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device->power.state = state;
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return result;
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}
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int acpi_bus_update_power(acpi_handle handle, int *state_p)
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{
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struct acpi_device *device;
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int state;
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int result;
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result = acpi_bus_get_device(handle, &device);
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if (result)
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return result;
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result = acpi_device_get_power(device, &state);
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if (result)
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return result;
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result = acpi_device_set_power(device, state);
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if (!result && state_p)
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*state_p = state;
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return result;
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}
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EXPORT_SYMBOL_GPL(acpi_bus_update_power);
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bool acpi_bus_power_manageable(acpi_handle handle)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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return result ? false : device->flags.power_manageable;
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}
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EXPORT_SYMBOL(acpi_bus_power_manageable);
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bool acpi_bus_can_wakeup(acpi_handle handle)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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return result ? false : device->wakeup.flags.valid;
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}
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EXPORT_SYMBOL(acpi_bus_can_wakeup);
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static void acpi_print_osc_error(acpi_handle handle,
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struct acpi_osc_context *context, char *error)
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{
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@ -30,6 +30,12 @@
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#include <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include "internal.h"
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#define _COMPONENT ACPI_POWER_COMPONENT
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ACPI_MODULE_NAME("device_pm");
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static DEFINE_MUTEX(acpi_pm_notifier_lock);
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@ -93,6 +99,288 @@ acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
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return status;
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}
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/**
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* acpi_power_state_string - String representation of ACPI device power state.
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* @state: ACPI device power state to return the string representation of.
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*/
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const char *acpi_power_state_string(int state)
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{
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switch (state) {
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case ACPI_STATE_D0:
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return "D0";
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case ACPI_STATE_D1:
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return "D1";
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case ACPI_STATE_D2:
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return "D2";
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case ACPI_STATE_D3_HOT:
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return "D3hot";
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case ACPI_STATE_D3_COLD:
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return "D3";
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default:
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return "(unknown)";
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}
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}
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/**
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* acpi_device_get_power - Get power state of an ACPI device.
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* @device: Device to get the power state of.
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* @state: Place to store the power state of the device.
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*
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* This function does not update the device's power.state field, but it may
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* update its parent's power.state field (when the parent's power state is
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* unknown and the device's power state turns out to be D0).
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*/
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int acpi_device_get_power(struct acpi_device *device, int *state)
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{
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int result = ACPI_STATE_UNKNOWN;
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if (!device || !state)
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return -EINVAL;
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if (!device->flags.power_manageable) {
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/* TBD: Non-recursive algorithm for walking up hierarchy. */
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*state = device->parent ?
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device->parent->power.state : ACPI_STATE_D0;
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goto out;
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}
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/*
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* Get the device's power state either directly (via _PSC) or
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* indirectly (via power resources).
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*/
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if (device->power.flags.explicit_get) {
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unsigned long long psc;
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acpi_status status = acpi_evaluate_integer(device->handle,
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"_PSC", NULL, &psc);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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result = psc;
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}
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/* The test below covers ACPI_STATE_UNKNOWN too. */
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if (result <= ACPI_STATE_D2) {
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; /* Do nothing. */
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} else if (device->power.flags.power_resources) {
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int error = acpi_power_get_inferred_state(device, &result);
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if (error)
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return error;
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} else if (result == ACPI_STATE_D3_HOT) {
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result = ACPI_STATE_D3;
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}
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/*
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* If we were unsure about the device parent's power state up to this
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* point, the fact that the device is in D0 implies that the parent has
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* to be in D0 too.
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*/
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if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
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&& result == ACPI_STATE_D0)
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device->parent->power.state = ACPI_STATE_D0;
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*state = result;
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out:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
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device->pnp.bus_id, acpi_power_state_string(*state)));
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return 0;
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}
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/**
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* acpi_device_set_power - Set power state of an ACPI device.
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* @device: Device to set the power state of.
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* @state: New power state to set.
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*
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* Callers must ensure that the device is power manageable before using this
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* function.
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*/
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int acpi_device_set_power(struct acpi_device *device, int state)
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{
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int result = 0;
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acpi_status status = AE_OK;
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char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
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bool cut_power = false;
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if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
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return -EINVAL;
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/* Make sure this is a valid target state */
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if (state == device->power.state) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
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acpi_power_state_string(state)));
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return 0;
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}
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if (!device->power.states[state].flags.valid) {
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printk(KERN_WARNING PREFIX "Device does not support %s\n",
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acpi_power_state_string(state));
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return -ENODEV;
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}
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if (device->parent && (state < device->parent->power.state)) {
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printk(KERN_WARNING PREFIX
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"Cannot set device to a higher-powered"
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" state than parent\n");
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return -ENODEV;
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}
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/* For D3cold we should first transition into D3hot. */
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if (state == ACPI_STATE_D3_COLD
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&& device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
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state = ACPI_STATE_D3_HOT;
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object_name[3] = '3';
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cut_power = true;
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}
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/*
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* Transition Power
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* ----------------
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* On transitions to a high-powered state we first apply power (via
|
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* power resources) then evalute _PSx. Conversly for transitions to
|
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* a lower-powered state.
|
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*/
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if (state < device->power.state) {
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if (device->power.state >= ACPI_STATE_D3_HOT &&
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state != ACPI_STATE_D0) {
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printk(KERN_WARNING PREFIX
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"Cannot transition to non-D0 state from D3\n");
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return -ENODEV;
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}
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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goto end;
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}
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if (device->power.states[state].flags.explicit_set) {
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status = acpi_evaluate_object(device->handle,
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object_name, NULL, NULL);
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if (ACPI_FAILURE(status)) {
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result = -ENODEV;
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goto end;
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}
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}
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} else {
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if (device->power.states[state].flags.explicit_set) {
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status = acpi_evaluate_object(device->handle,
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object_name, NULL, NULL);
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if (ACPI_FAILURE(status)) {
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result = -ENODEV;
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goto end;
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}
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}
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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goto end;
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}
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}
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if (cut_power)
|
||||
result = acpi_power_transition(device, ACPI_STATE_D3_COLD);
|
||||
|
||||
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;
|
||||
}
|
||||
EXPORT_SYMBOL(acpi_device_set_power);
|
||||
|
||||
int acpi_bus_set_power(acpi_handle handle, int state)
|
||||
{
|
||||
struct acpi_device *device;
|
||||
int result;
|
||||
|
||||
result = acpi_bus_get_device(handle, &device);
|
||||
if (result)
|
||||
return result;
|
||||
|
||||
if (!device->flags.power_manageable) {
|
||||
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
||||
"Device [%s] is not power manageable\n",
|
||||
dev_name(&device->dev)));
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
return acpi_device_set_power(device, state);
|
||||
}
|
||||
EXPORT_SYMBOL(acpi_bus_set_power);
|
||||
|
||||
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 (device->power.flags.power_resources)
|
||||
result = acpi_power_on_resources(device, state);
|
||||
|
||||
if (!result)
|
||||
device->power.state = state;
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
int acpi_bus_update_power(acpi_handle handle, int *state_p)
|
||||
{
|
||||
struct acpi_device *device;
|
||||
int state;
|
||||
int result;
|
||||
|
||||
result = acpi_bus_get_device(handle, &device);
|
||||
if (result)
|
||||
return result;
|
||||
|
||||
result = acpi_device_get_power(device, &state);
|
||||
if (result)
|
||||
return result;
|
||||
|
||||
result = acpi_device_set_power(device, state);
|
||||
if (!result && state_p)
|
||||
*state_p = state;
|
||||
|
||||
return result;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(acpi_bus_update_power);
|
||||
|
||||
bool acpi_bus_power_manageable(acpi_handle handle)
|
||||
{
|
||||
struct acpi_device *device;
|
||||
int result;
|
||||
|
||||
result = acpi_bus_get_device(handle, &device);
|
||||
return result ? false : device->flags.power_manageable;
|
||||
}
|
||||
EXPORT_SYMBOL(acpi_bus_power_manageable);
|
||||
|
||||
bool acpi_bus_can_wakeup(acpi_handle handle)
|
||||
{
|
||||
struct acpi_device *device;
|
||||
int result;
|
||||
|
||||
result = acpi_bus_get_device(handle, &device);
|
||||
return result ? false : device->wakeup.flags.valid;
|
||||
}
|
||||
EXPORT_SYMBOL(acpi_bus_can_wakeup);
|
||||
|
||||
/**
|
||||
* acpi_device_power_state - Get preferred power state of ACPI device.
|
||||
* @dev: Device whose preferred target power state to return.
|
||||
|
||||
@ -61,7 +61,6 @@ int acpi_device_sleep_wake(struct acpi_device *dev,
|
||||
int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
|
||||
int acpi_power_on_resources(struct acpi_device *device, int state);
|
||||
int acpi_power_transition(struct acpi_device *device, int state);
|
||||
int acpi_bus_init_power(struct acpi_device *device);
|
||||
|
||||
int acpi_wakeup_device_init(void);
|
||||
void acpi_early_processor_set_pdc(void);
|
||||
|
||||
@ -330,13 +330,51 @@ void acpi_bus_data_handler(acpi_handle handle, void *context);
|
||||
acpi_status acpi_bus_get_status_handle(acpi_handle handle,
|
||||
unsigned long long *sta);
|
||||
int acpi_bus_get_status(struct acpi_device *device);
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
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_init_power(struct acpi_device *device);
|
||||
int acpi_bus_update_power(acpi_handle handle, int *state_p);
|
||||
bool acpi_bus_power_manageable(acpi_handle handle);
|
||||
bool acpi_bus_can_wakeup(acpi_handle handle);
|
||||
#else /* !CONFIG_PM */
|
||||
static inline int acpi_bus_set_power(acpi_handle handle, int state)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline const char *acpi_power_state_string(int state)
|
||||
{
|
||||
return "D0";
|
||||
}
|
||||
static inline int acpi_device_get_power(struct acpi_device *device, int *state)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline int acpi_device_set_power(struct acpi_device *device, int state)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline int acpi_bus_init_power(struct acpi_device *device)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline int acpi_bus_update_power(acpi_handle handle, int *state_p)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline bool acpi_bus_power_manageable(acpi_handle handle)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
static inline bool acpi_bus_can_wakeup(acpi_handle handle)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
#endif /* !CONFIG_PM */
|
||||
|
||||
#ifdef CONFIG_ACPI_PROC_EVENT
|
||||
int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data);
|
||||
int acpi_bus_generate_proc_event4(const char *class, const char *bid, u8 type, int data);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user