W1: w1-gpio - switch to using dev_pm_ops

Let's stop using legacy platform driver hooks for power management and
switch to using the standard dev_pm_ops-based hooks.

Also, instead of guarding PM methods with #ifdef CONFIG_PM annotate them
as __maybe_unused as it provides better compile coverage.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/w1/masters/w1-gpio.c

@@ -198,11 +198,9 @@ static int w1_gpio_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-
-static int w1_gpio_suspend(struct platform_device *pdev, pm_message_t state)
+static int __maybe_unused w1_gpio_suspend(struct device *dev)
 {
-	struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct w1_gpio_platform_data *pdata = dev_get_platdata(dev);
 
 	if (pdata->enable_external_pullup)
 		pdata->enable_external_pullup(0);
@@ -210,9 +208,9 @@ static int w1_gpio_suspend(struct platform_device *pdev, pm_message_t state)
 	return 0;
 }
 
-static int w1_gpio_resume(struct platform_device *pdev)
+static int __maybe_unused w1_gpio_resume(struct device *dev)
 {
-	struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct w1_gpio_platform_data *pdata = dev_get_platdata(dev);
 
 	if (pdata->enable_external_pullup)
 		pdata->enable_external_pullup(1);
@@ -220,20 +218,16 @@ static int w1_gpio_resume(struct platform_device *pdev)
 	return 0;
 }
 
-#else
-#define w1_gpio_suspend	NULL
-#define w1_gpio_resume	NULL
-#endif
+static SIMPLE_DEV_PM_OPS(w1_gpio_pm_ops, w1_gpio_suspend, w1_gpio_resume);
 
 static struct platform_driver w1_gpio_driver = {
 	.driver = {
 		.name	= "w1-gpio",
+		.pm	= &w1_gpio_pm_ops,
 		.of_match_table = of_match_ptr(w1_gpio_dt_ids),
 	},
 	.probe = w1_gpio_probe,
-	.remove	= w1_gpio_remove,
-	.suspend = w1_gpio_suspend,
-	.resume = w1_gpio_resume,
+	.remove = w1_gpio_remove,
 };
 
 module_platform_driver(w1_gpio_driver);