HID: Intel-thc-hid: Intel-quicki2c: Add power management for touch device

Send POWER_SLEEP command to touch device when system enters into sleep
mode or hibernate mode to save more power; and send POWER_ON command to
take device back when system exits sleep mode.

Signed-off-by: Even Xu <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: Evenxf

drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c

@@ -807,6 +807,12 @@ static int quicki2c_suspend(struct device *device)
 	if (!qcdev)
 		return -ENODEV;
 
+	if (!device_may_wakeup(qcdev->dev)) {
+		ret = quicki2c_set_power(qcdev, HIDI2C_SLEEP);
+		if (ret)
+			return ret;
+	}
+
 	/*
 	 * As I2C is THC subsystem, no register auto save/restore support,
 	 * need driver to do that explicitly for every D3 case.
@@ -856,6 +862,9 @@ static int quicki2c_resume(struct device *device)
 	if (ret)
 		return ret;
 
+	if (!device_may_wakeup(qcdev->dev))
+		return quicki2c_set_power(qcdev, HIDI2C_ON);
+
 	return 0;
 }
 
@@ -913,6 +922,9 @@ static int quicki2c_poweroff(struct device *device)
 	if (!qcdev)
 		return -ENODEV;
 
+	/* Ignore the return value as platform will be poweroff soon */
+	quicki2c_set_power(qcdev, HIDI2C_SLEEP);
+
 	ret = thc_interrupt_quiesce(qcdev->thc_hw, true);
 	if (ret)
 		return ret;
@@ -966,7 +978,7 @@ static int quicki2c_restore(struct device *device)
 
 	thc_change_ltr_mode(qcdev->thc_hw, THC_LTR_MODE_ACTIVE);
 
-	return 0;
+	return quicki2c_set_power(qcdev, HIDI2C_ON);
 }
 
 static int quicki2c_runtime_suspend(struct device *device)