背光驱动内核层及驱动层分析

一些重要的结构体：

struct mt65xx_led_data {

         structled_classdev cdev;

         structcust_mt65xx_led cust;

         structwork_struct work;

         intlevel;

         intdelay_on;

         intdelay_off;

};

struct led_classdev {

         constchar                  *name;

         int                       brightness;

         int                       max_brightness;

         int                       flags;

 

         /*Lower 16 bits reflect status */

#define LED_SUSPENDED                  (1 << 0)

         /*Upper 16 bits reflect control information */

#define LED_CORE_SUSPENDRESUME   (1 << 16)

#define LED_BLINK_ONESHOT        (1 << 17)

#define LED_BLINK_ONESHOT_STOP      (1 << 18)

#define LED_BLINK_INVERT   (1 << 19)

 

         /*Set LED brightness level */

         /*Must not sleep, use a workqueue if needed */

         void           (*brightness_set)(struct led_classdev*led_cdev,

                                                 enumled_brightness brightness);

         /*Get LED brightness level */

         enumled_brightness (*brightness_get)(struct led_classdev *led_cdev);

 

         /*

          * Activate hardware accelerated blink, delaysare in milliseconds

          * and if both are zero then a sensible defaultshould be chosen.

          * The call should adjust the timings in thatcase and if it can't

          * match the values specified exactly.

          * Deactivate blinking again w