[PATCH 1/3] Input: atmel_mxt_ts - use runtime PM instead of custom functions

[Tony Lindgren <tony@atomide.com>]

Let's use standard runtime PM functions instead of custom start and stop
functions. This way we can implement runtime idle mode using runtime PM
autosuspend in the following patches.

Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 134 ++++++++++++++---------
 1 file changed, 85 insertions(+), 49 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -21,6 +21,7 @@
 #include <linux/input/mt.h>
 #include <linux/interrupt.h>
 #include <linux/of.h>
+#include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/slab.h>
 #include <linux/gpio/consumer.h>
@@ -2927,58 +2928,27 @@ static const struct attribute_group mxt_attr_group = {
 	.attrs = mxt_attrs,
 };
 
-static void mxt_start(struct mxt_data *data)
+static int mxt_input_open(struct input_dev *input_dev)
 {
-	switch (data->suspend_mode) {
-	case MXT_SUSPEND_T9_CTRL:
-		mxt_soft_reset(data);
-
-		/* Touch enable */
-		/* 0x83 = SCANEN | RPTEN | ENABLE */
-		mxt_write_object(data,
-				MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0x83);
-		break;
-
-	case MXT_SUSPEND_DEEP_SLEEP:
-	default:
-		mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
-
-		/* Recalibrate since chip has been in deep sleep */
-		mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
-		break;
-	}
-}
-
-static void mxt_stop(struct mxt_data *data)
-{
-	switch (data->suspend_mode) {
-	case MXT_SUSPEND_T9_CTRL:
-		/* Touch disable */
-		mxt_write_object(data,
-				MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0);
-		break;
+	struct mxt_data *data = input_get_drvdata(input_dev);
+	struct device *dev = &data->client->dev;
+	int error;
 
-	case MXT_SUSPEND_DEEP_SLEEP:
-	default:
-		mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
-		break;
+	error = pm_runtime_get_sync(dev);
+	if (error < 0) {
+		pm_runtime_put_noidle(dev);
+		return error;
 	}
-}
-
-static int mxt_input_open(struct input_dev *dev)
-{
-	struct mxt_data *data = input_get_drvdata(dev);
-
-	mxt_start(data);
 
 	return 0;
 }
 
-static void mxt_input_close(struct input_dev *dev)
+static void mxt_input_close(struct input_dev *input_dev)
 {
-	struct mxt_data *data = input_get_drvdata(dev);
+	struct mxt_data *data = input_get_drvdata(input_dev);
+	struct device *dev = &data->client->dev;
 
-	mxt_stop(data);
+	pm_runtime_put_sync(dev);
 }
 
 static int mxt_parse_device_properties(struct mxt_data *data)
@@ -3036,6 +3006,7 @@ static const struct dmi_system_id chromebook_T9_suspend_dmi[] = {
 static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	struct mxt_data *data;
+	struct device *dev;
 	int error;
 
 	/*
@@ -3070,6 +3041,7 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
 		 client->adapter->nr, client->addr);
 
+	dev = &client->dev;
 	data->client = client;
 	data->irq = client->irq;
 	i2c_set_clientdata(client, data);
@@ -3109,20 +3081,23 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		msleep(MXT_RESET_INVALID_CHG);
 	}
 
+	pm_runtime_enable(dev);
+
 	error = mxt_initialize(data);
 	if (error)
-		return error;
+		goto err_disable;
 
 	error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
 	if (error) {
 		dev_err(&client->dev, "Failure %d creating sysfs group\n",
 			error);
-		goto err_free_object;
+		goto err_disable;
 	}
 
 	return 0;
 
-err_free_object:
+err_disable:
+	pm_runtime_disable(dev);
 	mxt_free_input_device(data);
 	mxt_free_object_table(data);
 	return error;
@@ -3131,11 +3106,69 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 static int mxt_remove(struct i2c_client *client)
 {
 	struct mxt_data *data = i2c_get_clientdata(client);
+	struct device *dev = &data->client->dev;
 
 	disable_irq(data->irq);
 	sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
 	mxt_free_input_device(data);
 	mxt_free_object_table(data);
+	pm_runtime_disable(dev);
+
+	return 0;
+}
+
+static int __maybe_unused mxt_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct mxt_data *data = i2c_get_clientdata(client);
+	struct input_dev *input_dev = data->input_dev;
+
+	if (!input_dev)
+		return 0;
+
+	switch (data->suspend_mode) {
+	case MXT_SUSPEND_T9_CTRL:
+		/* Touch disable */
+		mxt_write_object(data,
+				 MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0);
+		break;
+
+	case MXT_SUSPEND_DEEP_SLEEP:
+	default:
+		mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
+		break;
+	}
+
+	return 0;
+}
+
+static int __maybe_unused mxt_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct mxt_data *data = i2c_get_clientdata(client);
+	struct input_dev *input_dev = data->input_dev;
+
+	if (!input_dev)
+		return 0;
+
+	switch (data->suspend_mode) {
+	case MXT_SUSPEND_T9_CTRL:
+		mxt_soft_reset(data);
+
+		/* Touch enable */
+		/* 0x83 = SCANEN | RPTEN | ENABLE */
+		mxt_write_object(data,
+				 MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0x83);
+		break;
+
+	case MXT_SUSPEND_DEEP_SLEEP:
+	default:
+		mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
+
+		/* Recalibrate since chip has been in deep sleep */
+		mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
+		break;
+	}
 
 	return 0;
 }
@@ -3152,7 +3185,7 @@ static int __maybe_unused mxt_suspend(struct device *dev)
 	mutex_lock(&input_dev->mutex);
 
 	if (input_dev->users)
-		mxt_stop(data);
+		mxt_runtime_suspend(dev);
 
 	mutex_unlock(&input_dev->mutex);
 
@@ -3175,14 +3208,17 @@ static int __maybe_unused mxt_resume(struct device *dev)
 	mutex_lock(&input_dev->mutex);
 
 	if (input_dev->users)
-		mxt_start(data);
+		mxt_runtime_resume(dev);
 
 	mutex_unlock(&input_dev->mutex);
 
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);
+const struct dev_pm_ops mxt_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mxt_suspend, mxt_resume)
+	SET_RUNTIME_PM_OPS(mxt_runtime_suspend, mxt_runtime_resume, NULL)
+};
 
 static const struct of_device_id mxt_of_match[] = {
 	{ .compatible = "atmel,maxtouch", },
-- 
2.25.1