Input: omap4-keypad - use PM runtime autosuspend

Implement PM runtime autosuspend support to prepare for adding handling to
clear stuck last pressed key in the following patches. The hardware has
support for autoidle and can wake up to keypress events.

Let's also update omap4_keypad_probe() to use dev instead of &pdev->dev
since we already have it from the earlier changes.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/X/vqCs5/EDURprAJ@atomide.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/omap4-keypad.c

@@ -172,9 +172,17 @@ static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
 static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
 {
 	struct omap4_keypad *keypad_data = dev_id;
+	struct device *dev = keypad_data->input->dev.parent;
 	u32 low, high;
+	int error;
 	u64 keys;
 
+	error = pm_runtime_get_sync(dev);
+	if (error < 0) {
+		pm_runtime_put_noidle(dev);
+		return IRQ_NONE;
+	}
+
 	low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
 	high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
 	keys = low | (u64)high << 32;
@@ -185,14 +193,23 @@ static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
 	return IRQ_HANDLED;
 }
 
 static int omap4_keypad_open(struct input_dev *input)
 {
 	struct omap4_keypad *keypad_data = input_get_drvdata(input);
+	struct device *dev = input->dev.parent;
+	int error;
 
-	pm_runtime_get_sync(input->dev.parent);
+	error = pm_runtime_get_sync(dev);
+	if (error < 0) {
+		pm_runtime_put_noidle(dev);
+		return error;
+	}
 
 	disable_irq(keypad_data->irq);
 
@@ -211,6 +228,9 @@ static int omap4_keypad_open(struct input_dev *input)
 
 	enable_irq(keypad_data->irq);
 
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
 	return 0;
 }
 
@@ -228,14 +248,20 @@ static void omap4_keypad_stop(struct omap4_keypad *keypad_data)
 
 static void omap4_keypad_close(struct input_dev *input)
 {
-	struct omap4_keypad *keypad_data;
+	struct omap4_keypad *keypad_data = input_get_drvdata(input);
+	struct device *dev = input->dev.parent;
+	int error;
+
+	error = pm_runtime_get_sync(dev);
+	if (error < 0)
+		pm_runtime_put_noidle(dev);
 
-	keypad_data = input_get_drvdata(input);
 	disable_irq(keypad_data->irq);
 	omap4_keypad_stop(keypad_data);
 	enable_irq(keypad_data->irq);
 
-	pm_runtime_put_sync(input->dev.parent);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 }
 
 static int omap4_keypad_parse_dt(struct device *dev,
@@ -282,6 +308,7 @@ static int omap4_keypad_check_revision(struct device *dev,
 
 static void omap4_disable_pm(void *d)
 {
+	pm_runtime_dont_use_autosuspend(d);
 	pm_runtime_disable(d);
 }
 
@@ -313,6 +340,7 @@ static int omap4_keypad_probe(struct platform_device *pdev)
 
 	keypad_data->irq = irq;
 	mutex_init(&keypad_data->lock);
+	platform_set_drvdata(pdev, keypad_data);
 
 	error = omap4_keypad_parse_dt(dev, keypad_data);
 	if (error)
@@ -322,6 +350,7 @@ static int omap4_keypad_probe(struct platform_device *pdev)
 	if (IS_ERR(keypad_data->base))
 		return PTR_ERR(keypad_data->base);
 
+	pm_runtime_use_autosuspend(dev);
 	pm_runtime_enable(dev);
 
 	error = devm_add_action_or_reset(dev, omap4_disable_pm, dev);
@@ -334,20 +363,21 @@ static int omap4_keypad_probe(struct platform_device *pdev)
 	 * Enable clocks for the keypad module so that we can read
 	 * revision register.
 	 */
-	error = pm_runtime_get_sync(&pdev->dev);
+	error = pm_runtime_get_sync(dev);
 	if (error) {
-		dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
-		pm_runtime_put_noidle(&pdev->dev);
+		dev_err(dev, "pm_runtime_get_sync() failed\n");
+		pm_runtime_put_noidle(dev);
 		return error;
 	}
 
-	error = omap4_keypad_check_revision(&pdev->dev, keypad_data);
+	error = omap4_keypad_check_revision(dev, keypad_data);
 	if (!error) {
 		/* Ensure device does not raise interrupts */
 		omap4_keypad_stop(keypad_data);
 	}
 
-	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 	if (error)
 		return error;
 
@@ -411,8 +441,6 @@ static int omap4_keypad_probe(struct platform_device *pdev)
 	if (error)
 		dev_warn(dev, "failed to set up wakeup irq: %d\n", error);
 
-	platform_set_drvdata(pdev, keypad_data);
-
 	return 0;
 }