ACPI / PM: Move device power state selection routine to device_pm.c

The ACPI function for choosing device power state is now located
in drivers/acpi/sleep.c, but drivers/acpi/device_pm.c is a more
logical place for it, so move it there.

However, instead of moving the function entirely, move its core only
under a different name and with a different list of arguments, so
that it is more flexible, and leave a wrapper around it in the
original location.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 85 deletions

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 4defa0297ee4..fa20d0171887 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -19,7 +19,6 @@
 #include <linux/acpi.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
-#include <linux/pm_qos.h>
 
 #include <asm/io.h>
 
@@ -691,101 +690,20 @@ int acpi_suspend(u32 acpi_state)
  * Return value: Preferred power state of the device on success, -ENODEV
  * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
  *
- * Find the lowest power (highest number) ACPI device power state that the
- * device can be in while the system is in the sleep state represented
- * by %acpi_target_sleep_state.  If @d_min_p is set, the highest power (lowest
- * number) device power state that @dev can be in for the given system sleep
- * state is stored at the location pointed to by it.
- *
  * The caller must ensure that @dev is valid before using this function.
  */
 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 {
 	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 	struct acpi_device *adev;
-	char acpi_method[] = "_SxD";
-	unsigned long long d_min, d_max;
-	bool wakeup = false;
 
-	if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
-		return -EINVAL;
 	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
-		printk(KERN_DEBUG "ACPI handle has no context!\n");
+		dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
 		return -ENODEV;
 	}
-	if (d_max_in > ACPI_STATE_D3_HOT) {
-		enum pm_qos_flags_status stat;
-
-		stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
-		if (stat == PM_QOS_FLAGS_ALL)
-			d_max_in = ACPI_STATE_D3_HOT;
-	}
-
-	acpi_method[2] = '0' + acpi_target_sleep_state;
-	/*
-	 * If the sleep state is S0, the lowest limit from ACPI is D3,
-	 * but if the device has _S0W, we will use the value from _S0W
-	 * as the lowest limit from ACPI.  Finally, we will constrain
-	 * the lowest limit with the specified one.
-	 */
-	d_min = ACPI_STATE_D0;
-	d_max = ACPI_STATE_D3;
-
-	/*
-	 * If present, _SxD methods return the minimum D-state (highest power
-	 * state) we can use for the corresponding S-states.  Otherwise, the
-	 * minimum D-state is D0 (ACPI 3.x).
-	 *
-	 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
-	 * provided -- that's our fault recovery, we ignore retval.
-	 */
-	if (acpi_target_sleep_state > ACPI_STATE_S0) {
-		acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
-		wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
-			&& adev->wakeup.sleep_state >= acpi_target_sleep_state;
-	} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
-			PM_QOS_FLAGS_NONE) {
-		wakeup = adev->wakeup.flags.valid;
-	}
-
-	/*
-	 * If _PRW says we can wake up the system from the target sleep state,
-	 * the D-state returned by _SxD is sufficient for that (we assume a
-	 * wakeup-aware driver if wake is set).  Still, if _SxW exists
-	 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
-	 * can wake the system.  _S0W may be valid, too.
-	 */
-	if (wakeup) {
-		acpi_status status;
-
-		acpi_method[3] = 'W';
-		status = acpi_evaluate_integer(handle, acpi_method, NULL,
-						&d_max);
-		if (ACPI_FAILURE(status)) {
-			if (acpi_target_sleep_state != ACPI_STATE_S0 ||
-			    status != AE_NOT_FOUND)
-				d_max = d_min;
-		} else if (d_max < d_min) {
-			/* Warn the user of the broken DSDT */
-			printk(KERN_WARNING "ACPI: Wrong value from %s\n",
-				acpi_method);
-			/* Sanitize it */
-			d_min = d_max;
-		}
-	}
 
-	if (d_max_in < d_min)
-		return -EINVAL;
-	if (d_min_p)
-		*d_min_p = d_min;
-	/* constrain d_max with specified lowest limit (max number) */
-	if (d_max > d_max_in) {
-		for (d_max = d_max_in; d_max > d_min; d_max--) {
-			if (adev->power.states[d_max].flags.valid)
-				break;
-		}
-	}
-	return d_max;
+	return acpi_device_power_state(dev, adev, acpi_target_sleep_state,
+				       d_max_in, d_min_p);
 }
 EXPORT_SYMBOL(acpi_pm_device_sleep_state);
 #endif /* CONFIG_PM */