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 enum 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 26 enum 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) \ 40 static 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) \ 48 static 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) \ 56 static 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) \ 64 static 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) \ 72 static 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 79 struct lp55xx_led; 80 struct lp55xx_chip; 81 82 /* 83 * struct lp55xx_reg 84 * @addr : Register address 85 * @val : Register value 86 */ 87 struct 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 */ 104 struct 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 */ 133 struct 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 */ 149 struct 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 */ 171 struct 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 */ 182 extern int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val); 183 extern int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val); 184 extern int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, 185 u8 mask, u8 val); 186 187 /* external clock detection */ 188 extern bool lp55xx_is_extclk_used(struct lp55xx_chip *chip); 189 190 /* common device init/deinit functions */ 191 extern int lp55xx_init_device(struct lp55xx_chip *chip); 192 extern void lp55xx_deinit_device(struct lp55xx_chip *chip); 193 194 /* common LED class device functions */ 195 extern int lp55xx_register_leds(struct lp55xx_led *led, 196 struct lp55xx_chip *chip); 197 extern void lp55xx_unregister_leds(struct lp55xx_led *led, 198 struct lp55xx_chip *chip); 199 200 /* common device attributes functions */ 201 extern int lp55xx_register_sysfs(struct lp55xx_chip *chip); 202 extern void lp55xx_unregister_sysfs(struct lp55xx_chip *chip); 203 204 /* common device tree population function */ 205 extern struct lp55xx_platform_data 206 *lp55xx_of_populate_pdata(struct device *dev, struct device_node *np); 207 208 #endif /* _LEDS_LP55XX_COMMON_H */ 209