drivers/leds/leds-lp55xx-common.h

   1 /*
   2  * LP55XX Common Driver Header
   3  *
   4  * Copyright (C) 2012 Texas Instruments
   5  *
   6  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * Derived from leds-lp5521.c, leds-lp5523.c
  13  */
  14
  15 #ifndef _LEDS_LP55XX_COMMON_H
  16 #define _LEDS_LP55XX_COMMON_H
  17
  18 struct lp55xx_led;
  19 struct lp55xx_chip;
  20
  21 /*
  22  * struct lp55xx_reg
  23  * @addr : Register address
  24  * @val  : Register value
  25  */
  26 struct lp55xx_reg {
  27         u8 addr;
  28         u8 val;
  29 };
  30
  31 /*
  32  * struct lp55xx_device_config
  33  * @reset              : Chip specific reset command
  34  * @enable             : Chip specific enable command
  35  * @max_channel        : Maximum number of channels
  36  * @post_init_device   : Chip specific initialization code
  37  * @brightness_work_fn : Brightness work function
  38  * @set_led_current    : LED current set function
  39  */
  40 struct lp55xx_device_config {
  41         const struct lp55xx_reg reset;
  42         const struct lp55xx_reg enable;
  43         const int max_channel;
  44
  45         /* define if the device has specific initialization process */
  46         int (*post_init_device) (struct lp55xx_chip *chip);
  47
  48         /* access brightness register */
  49         void (*brightness_work_fn)(struct work_struct *work);
  50
  51         /* current setting function */
  52         void (*set_led_current) (struct lp55xx_led *led, u8 led_current);
  53 };
  54
  55 /*
  56  * struct lp55xx_chip
  57  * @cl         : I2C communication for access registers
  58  * @pdata      : Platform specific data
  59  * @lock       : Lock for user-space interface
  60  * @num_leds   : Number of registered LEDs
  61  * @cfg        : Device specific configuration data
  62  */
  63 struct lp55xx_chip {
  64         struct i2c_client *cl;
  65         struct lp55xx_platform_data *pdata;
  66         struct mutex lock;      /* lock for user-space interface */
  67         int num_leds;
  68         struct lp55xx_device_config *cfg;
  69 };
  70
  71 /*
  72  * struct lp55xx_led
  73  * @chan_nr         : Channel number
  74  * @cdev            : LED class device
  75  * @led_current     : Current setting at each led channel
  76  * @max_current     : Maximun current at each led channel
  77  * @brightness_work : Workqueue for brightness control
  78  * @brightness      : Brightness value
  79  * @chip            : The lp55xx chip data
  80  */
  81 struct lp55xx_led {
  82         int chan_nr;
  83         struct led_classdev cdev;
  84         u8 led_current;
  85         u8 max_current;
  86         struct work_struct brightness_work;
  87         u8 brightness;
  88         struct lp55xx_chip *chip;
  89 };
  90
  91 /* register access */
  92 extern int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val);
  93 extern int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val);
  94 extern int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg,
  95                         u8 mask, u8 val);
  96
  97 /* common device init/deinit functions */
  98 extern int lp55xx_init_device(struct lp55xx_chip *chip);
  99 extern void lp55xx_deinit_device(struct lp55xx_chip *chip);
 100
 101 /* common LED class device functions */
 102 extern int lp55xx_register_leds(struct lp55xx_led *led,
 103                                 struct lp55xx_chip *chip);
 104 extern void lp55xx_unregister_leds(struct lp55xx_led *led,
 105                                 struct lp55xx_chip *chip);
 106
 107 /* common device attributes functions */
 108 extern int lp55xx_register_sysfs(struct lp55xx_chip *chip);
 109
 110 #endif /* _LEDS_LP55XX_COMMON_H */