SIMPLE_DEV_PM_OPS宏

pm.h有一个宏SIMPLE_DEV_PM_OPS:

#define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) const struct dev_pm_ops name = { 	SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) }

再看SET_SYSTEM_SLEEP_PM_OPS和dev_pm_ops的定义：

#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) 	.suspend = suspend_fn, 	.resume = resume_fn, 	.freeze = suspend_fn, 	.thaw = resume_fn, 	.poweroff = suspend_fn, 	.restore = resume_fn,

struct dev_pm_ops {
	int (*prepare)(struct device *dev);
	void (*complete)(struct device *dev);
	int (*suspend)(struct device *dev);
	int (*resume)(struct device *dev);
	int (*freeze)(struct device *dev);
	int (*thaw)(struct device *dev);
	int (*poweroff)(struct device *dev);
	int (*restore)(struct device *dev);
	int (*suspend_noirq)(struct device *dev);
	int (*resume_noirq)(struct device *dev);
	int (*freeze_noirq)(struct device *dev);
	int (*thaw_noirq)(struct device *dev);
	int (*poweroff_noirq)(struct device *dev);
	int (*restore_noirq)(struct device *dev);
	int (*runtime_suspend)(struct device *dev);
	int (*runtime_resume)(struct device *dev);
	int (*runtime_idle)(struct device *dev);
};

struct platform_driver中的driver成员也有一个dev_pm_ops

struct platform_driver {
	int (*probe)(struct platform_device *);
	int (*remove)(struct platform_device *);
	void (*shutdown)(struct platform_device *);
	int (*suspend)(struct platform_device *, pm_message_t state);
	int (*resume)(struct platform_device *);
	struct device_driver driver;
	const struct platform_device_id *id_table;
};

struct device_driver {
	const char		*name;
	struct bus_type		*bus;

	struct module		*owner;
	const char		*mod_name;	/* used for built-in modules */

	bool suppress_bind_attrs;	/* disables bind/unbind via sysfs */

	const struct of_device_id	*of_match_table;

	int (*probe) (struct device *dev);
	int (*remove) (struct device *dev);
	void (*shutdown) (struct device *dev);
	int (*suspend) (struct device *dev, pm_message_t state);
	int (*resume) (struct device *dev);
	const struct attribute_group **groups;

	const struct dev_pm_ops *pm;

	struct driver_private *p;
};

那么可以将宏SIMPLE_DEV_PM_OPS使用到struct platform_driver定义中，例如gpio-keys.c中：

static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume);

static struct platform_driver gpio_keys_device_driver = {
	.probe		= gpio_keys_probe,
	.remove		= __devexit_p(gpio_keys_remove),
	.driver		= {
		.name	= "gpio-keys",
		.owner	= THIS_MODULE,
		.pm	= &gpio_keys_pm_ops,
		.of_match_table = gpio_keys_of_match,
	}
};