Input: ad714x - unify dev_pm_ops using EXPORT_SIMPLE_DEV_PM_OPS()

The I2C and SPI PM callbacks were identical (though wrapped in some
bouncing out to the bus specific container of the struct device and
then back again to get the drvdata). As such rather than just moving
these to SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() take the opportunity
to unify the struct dev_pm_ops and use the new EXPORT_SIMPLE_DEV_PM_OPS()
macro so that we can drop the unused suspend and resume callbacks as well
as the structure if !CONFIG_PM_SLEEP without needing to mark the callbacks
__maybe_unused.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Link: https://lore.kernel.org/r/20230114171620.42891-8-jic23@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: jic23

drivers/input/misc/ad714x-i2c.c

@@ -12,18 +12,6 @@
 #include <linux/pm.h>
 #include "ad714x.h"
 
-static int __maybe_unused ad714x_i2c_suspend(struct device *dev)
-{
-	return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
-}
-
-static int __maybe_unused ad714x_i2c_resume(struct device *dev)
-{
-	return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
-}
-
-static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
-
 static int ad714x_i2c_write(struct ad714x_chip *chip,
 			    unsigned short reg, unsigned short data)
 {
@@ -96,7 +84,7 @@ MODULE_DEVICE_TABLE(i2c, ad714x_id);
 static struct i2c_driver ad714x_i2c_driver = {
 	.driver = {
 		.name = "ad714x_captouch",
-		.pm   = &ad714x_i2c_pm,
+		.pm   = pm_sleep_ptr(&ad714x_pm),
 	},
 	.probe_new = ad714x_i2c_probe,
 	.id_table = ad714x_id,

drivers/input/misc/ad714x-spi.c

@@ -15,18 +15,6 @@
 #define AD714x_SPI_CMD_PREFIX      0xE000   /* bits 15:11 */
 #define AD714x_SPI_READ            BIT(10)
 
-static int __maybe_unused ad714x_spi_suspend(struct device *dev)
-{
-	return ad714x_disable(spi_get_drvdata(to_spi_device(dev)));
-}
-
-static int __maybe_unused ad714x_spi_resume(struct device *dev)
-{
-	return ad714x_enable(spi_get_drvdata(to_spi_device(dev)));
-}
-
-static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
-
 static int ad714x_spi_read(struct ad714x_chip *chip,
 			   unsigned short reg, unsigned short *data, size_t len)
 {
@@ -103,7 +91,7 @@ static int ad714x_spi_probe(struct spi_device *spi)
 static struct spi_driver ad714x_spi_driver = {
 	.driver = {
 		.name	= "ad714x_captouch",
-		.pm	= &ad714x_spi_pm,
+		.pm	= pm_sleep_ptr(&ad714x_pm),
 	},
 	.probe		= ad714x_spi_probe,
 };

drivers/input/misc/ad714x.c

@@ -1162,9 +1162,9 @@ struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq,
 }
 EXPORT_SYMBOL(ad714x_probe);
 
-#ifdef CONFIG_PM
-int ad714x_disable(struct ad714x_chip *ad714x)
+static int ad714x_suspend(struct device *dev)
 {
+	struct ad714x_chip *ad714x = dev_get_drvdata(dev);
 	unsigned short data;
 
 	dev_dbg(ad714x->dev, "%s enter\n", __func__);
@@ -1178,10 +1178,10 @@ int ad714x_disable(struct ad714x_chip *ad714x)
 
 	return 0;
 }
-EXPORT_SYMBOL(ad714x_disable);
 
-int ad714x_enable(struct ad714x_chip *ad714x)
+static int ad714x_resume(struct device *dev)
 {
+	struct ad714x_chip *ad714x = dev_get_drvdata(dev);
 	dev_dbg(ad714x->dev, "%s enter\n", __func__);
 
 	mutex_lock(&ad714x->mutex);
@@ -1201,8 +1201,8 @@ int ad714x_enable(struct ad714x_chip *ad714x)
 
 	return 0;
 }
-EXPORT_SYMBOL(ad714x_enable);
-#endif
+
+EXPORT_SIMPLE_DEV_PM_OPS(ad714x_pm, ad714x_suspend, ad714x_resume);
 
 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor Driver");
 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");

drivers/input/misc/ad714x.h

@@ -8,6 +8,7 @@
 #ifndef _AD714X_H_
 #define _AD714X_H_
 
+#include <linux/pm.h>
 #include <linux/types.h>
 
 #define STAGE_NUM              12
@@ -45,8 +46,7 @@ struct ad714x_chip {
 
 };
 
-int ad714x_disable(struct ad714x_chip *ad714x);
-int ad714x_enable(struct ad714x_chip *ad714x);
+extern const struct dev_pm_ops ad714x_pm;
 struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq,
 				 ad714x_read_t read, ad714x_write_t write);