linux/drivers/leds/leds-lp55xx-common.h
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   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
  18enum lp55xx_engine_index {
  19        LP55XX_ENGINE_INVALID,
  20        LP55XX_ENGINE_1,
  21        LP55XX_ENGINE_2,
  22        LP55XX_ENGINE_3,
  23        LP55XX_ENGINE_MAX = LP55XX_ENGINE_3,
  24};
  25
  26enum lp55xx_engine_mode {
  27        LP55XX_ENGINE_DISABLED,
  28        LP55XX_ENGINE_LOAD,
  29        LP55XX_ENGINE_RUN,
  30};
  31
  32#define LP55XX_DEV_ATTR_RW(name, show, store)   \
  33        DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show, store)
  34#define LP55XX_DEV_ATTR_RO(name, show)          \
  35        DEVICE_ATTR(name, S_IRUGO, show, NULL)
  36#define LP55XX_DEV_ATTR_WO(name, store)         \
  37        DEVICE_ATTR(name, S_IWUSR, NULL, store)
  38
  39#define show_mode(nr)                                                   \
  40static ssize_t show_engine##nr##_mode(struct device *dev,               \
  41                                    struct device_attribute *attr,      \
  42                                    char *buf)                          \
  43{                                                                       \
  44        return show_engine_mode(dev, attr, buf, nr);                    \
  45}
  46
  47#define store_mode(nr)                                                  \
  48static ssize_t store_engine##nr##_mode(struct device *dev,              \
  49                                     struct device_attribute *attr,     \
  50                                     const char *buf, size_t len)       \
  51{                                                                       \
  52        return store_engine_mode(dev, attr, buf, len, nr);              \
  53}
  54
  55#define show_leds(nr)                                                   \
  56static ssize_t show_engine##nr##_leds(struct device *dev,               \
  57                            struct device_attribute *attr,              \
  58                            char *buf)                                  \
  59{                                                                       \
  60        return show_engine_leds(dev, attr, buf, nr);                    \
  61}
  62
  63#define store_leds(nr)                                          \
  64static ssize_t store_engine##nr##_leds(struct device *dev,      \
  65                             struct device_attribute *attr,     \
  66                             const char *buf, size_t len)       \
  67{                                                               \
  68        return store_engine_leds(dev, attr, buf, len, nr);      \
  69}
  70
  71#define store_load(nr)                                                  \
  72static ssize_t store_engine##nr##_load(struct device *dev,              \
  73                                     struct device_attribute *attr,     \
  74                                     const char *buf, size_t len)       \
  75{                                                                       \
  76        return store_engine_load(dev, attr, buf, len, nr);              \
  77}
  78
  79struct lp55xx_led;
  80struct lp55xx_chip;
  81
  82/*
  83 * struct lp55xx_reg
  84 * @addr : Register address
  85 * @val  : Register value
  86 */
  87struct lp55xx_reg {
  88        u8 addr;
  89        u8 val;
  90};
  91
  92/*
  93 * struct lp55xx_device_config
  94 * @reset              : Chip specific reset command
  95 * @enable             : Chip specific enable command
  96 * @max_channel        : Maximum number of channels
  97 * @post_init_device   : Chip specific initialization code
  98 * @brightness_work_fn : Brightness work function
  99 * @set_led_current    : LED current set function
 100 * @firmware_cb        : Call function when the firmware is loaded
 101 * @run_engine         : Run internal engine for pattern
 102 * @dev_attr_group     : Device specific attributes
 103 */
 104struct lp55xx_device_config {
 105        const struct lp55xx_reg reset;
 106        const struct lp55xx_reg enable;
 107        const int max_channel;
 108
 109        /* define if the device has specific initialization process */
 110        int (*post_init_device) (struct lp55xx_chip *chip);
 111
 112        /* access brightness register */
 113        void (*brightness_work_fn)(struct work_struct *work);
 114
 115        /* current setting function */
 116        void (*set_led_current) (struct lp55xx_led *led, u8 led_current);
 117
 118        /* access program memory when the firmware is loaded */
 119        void (*firmware_cb)(struct lp55xx_chip *chip);
 120
 121        /* used for running firmware LED patterns */
 122        void (*run_engine) (struct lp55xx_chip *chip, bool start);
 123
 124        /* additional device specific attributes */
 125        const struct attribute_group *dev_attr_group;
 126};
 127
 128/*
 129 * struct lp55xx_engine
 130 * @mode       : Engine mode
 131 * @led_mux    : Mux bits for LED selection. Only used in LP5523
 132 */
 133struct lp55xx_engine {
 134        enum lp55xx_engine_mode mode;
 135        u16 led_mux;
 136};
 137
 138/*
 139 * struct lp55xx_chip
 140 * @cl         : I2C communication for access registers
 141 * @pdata      : Platform specific data
 142 * @lock       : Lock for user-space interface
 143 * @num_leds   : Number of registered LEDs
 144 * @cfg        : Device specific configuration data
 145 * @engine_idx : Selected engine number
 146 * @engines    : Engine structure for the device attribute R/W interface
 147 * @fw         : Firmware data for running a LED pattern
 148 */
 149struct lp55xx_chip {
 150        struct i2c_client *cl;
 151        struct clk *clk;
 152        struct lp55xx_platform_data *pdata;
 153        struct mutex lock;      /* lock for user-space interface */
 154        int num_leds;
 155        struct lp55xx_device_config *cfg;
 156        enum lp55xx_engine_index engine_idx;
 157        struct lp55xx_engine engines[LP55XX_ENGINE_MAX];
 158        const struct firmware *fw;
 159};
 160
 161/*
 162 * struct lp55xx_led
 163 * @chan_nr         : Channel number
 164 * @cdev            : LED class device
 165 * @led_current     : Current setting at each led channel
 166 * @max_current     : Maximun current at each led channel
 167 * @brightness_work : Workqueue for brightness control
 168 * @brightness      : Brightness value
 169 * @chip            : The lp55xx chip data
 170 */
 171struct lp55xx_led {
 172        int chan_nr;
 173        struct led_classdev cdev;
 174        u8 led_current;
 175        u8 max_current;
 176        struct work_struct brightness_work;
 177        u8 brightness;
 178        struct lp55xx_chip *chip;
 179};
 180
 181/* register access */
 182extern int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val);
 183extern int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val);
 184extern int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg,
 185                        u8 mask, u8 val);
 186
 187/* external clock detection */
 188extern bool lp55xx_is_extclk_used(struct lp55xx_chip *chip);
 189
 190/* common device init/deinit functions */
 191extern int lp55xx_init_device(struct lp55xx_chip *chip);
 192extern void lp55xx_deinit_device(struct lp55xx_chip *chip);
 193
 194/* common LED class device functions */
 195extern int lp55xx_register_leds(struct lp55xx_led *led,
 196                                struct lp55xx_chip *chip);
 197extern void lp55xx_unregister_leds(struct lp55xx_led *led,
 198                                struct lp55xx_chip *chip);
 199
 200/* common device attributes functions */
 201extern int lp55xx_register_sysfs(struct lp55xx_chip *chip);
 202extern void lp55xx_unregister_sysfs(struct lp55xx_chip *chip);
 203
 204/* common device tree population function */
 205extern int lp55xx_of_populate_pdata(struct device *dev,
 206                                    struct device_node *np);
 207
 208#endif /* _LEDS_LP55XX_COMMON_H */
 209
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