SIMPLE_DEV_PM_OPS宏

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,
    }
};