G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Simple driver for Texas Instruments LM3639 Backlight + Flash LED driver chip |
| 3 | * Copyright (C) 2012 Texas Instruments |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | */ |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/i2c.h> |
| 13 | #include <linux/leds.h> |
| 14 | #include <linux/backlight.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/uaccess.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/regmap.h> |
| 20 | #include <linux/platform_data/lm3639_bl.h> |
| 21 | |
| 22 | #define REG_DEV_ID 0x00 |
| 23 | #define REG_CHECKSUM 0x01 |
| 24 | #define REG_BL_CONF_1 0x02 |
| 25 | #define REG_BL_CONF_2 0x03 |
| 26 | #define REG_BL_CONF_3 0x04 |
| 27 | #define REG_BL_CONF_4 0x05 |
| 28 | #define REG_FL_CONF_1 0x06 |
| 29 | #define REG_FL_CONF_2 0x07 |
| 30 | #define REG_FL_CONF_3 0x08 |
| 31 | #define REG_IO_CTRL 0x09 |
| 32 | #define REG_ENABLE 0x0A |
| 33 | #define REG_FLAG 0x0B |
| 34 | #define REG_MAX REG_FLAG |
| 35 | |
| 36 | struct lm3639_chip_data { |
| 37 | struct device *dev; |
| 38 | struct lm3639_platform_data *pdata; |
| 39 | |
| 40 | struct backlight_device *bled; |
| 41 | struct led_classdev cdev_flash; |
| 42 | struct led_classdev cdev_torch; |
| 43 | struct regmap *regmap; |
| 44 | |
| 45 | unsigned int bled_mode; |
| 46 | unsigned int bled_map; |
| 47 | unsigned int last_flag; |
| 48 | }; |
| 49 | |
| 50 | /* initialize chip */ |
Bill Pemberton | 1b9e450 | 2012-11-19 13:21:46 -0500 | [diff] [blame] | 51 | static int lm3639_chip_init(struct lm3639_chip_data *pchip) |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 52 | { |
| 53 | int ret; |
| 54 | unsigned int reg_val; |
| 55 | struct lm3639_platform_data *pdata = pchip->pdata; |
| 56 | |
| 57 | /* input pins config. */ |
| 58 | ret = |
| 59 | regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08, |
| 60 | pdata->pin_pwm); |
| 61 | if (ret < 0) |
| 62 | goto out; |
| 63 | |
| 64 | reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx; |
| 65 | ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val); |
| 66 | if (ret < 0) |
| 67 | goto out; |
| 68 | |
| 69 | /* init brightness */ |
| 70 | ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led); |
| 71 | if (ret < 0) |
| 72 | goto out; |
| 73 | |
| 74 | ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led); |
| 75 | if (ret < 0) |
| 76 | goto out; |
| 77 | |
| 78 | /* output pins config. */ |
| 79 | if (!pdata->init_brt_led) |
| 80 | reg_val = pdata->fled_pins | pdata->bled_pins; |
| 81 | else |
| 82 | reg_val = pdata->fled_pins | pdata->bled_pins | 0x01; |
| 83 | |
| 84 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val); |
| 85 | if (ret < 0) |
| 86 | goto out; |
| 87 | |
| 88 | return ret; |
| 89 | out: |
| 90 | dev_err(pchip->dev, "i2c failed to access register\n"); |
| 91 | return ret; |
| 92 | } |
| 93 | |
| 94 | /* update and get brightness */ |
| 95 | static int lm3639_bled_update_status(struct backlight_device *bl) |
| 96 | { |
| 97 | int ret; |
| 98 | unsigned int reg_val; |
| 99 | struct lm3639_chip_data *pchip = bl_get_data(bl); |
| 100 | struct lm3639_platform_data *pdata = pchip->pdata; |
| 101 | |
| 102 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); |
| 103 | if (ret < 0) |
| 104 | goto out; |
| 105 | |
| 106 | if (reg_val != 0) |
| 107 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); |
| 108 | |
| 109 | /* pwm control */ |
| 110 | if (pdata->pin_pwm) { |
| 111 | if (pdata->pwm_set_intensity) |
| 112 | pdata->pwm_set_intensity(bl->props.brightness, |
| 113 | pdata->max_brt_led); |
| 114 | else |
| 115 | dev_err(pchip->dev, |
| 116 | "No pwm control func. in plat-data\n"); |
| 117 | return bl->props.brightness; |
| 118 | } |
| 119 | |
| 120 | /* i2c control and set brigtness */ |
| 121 | ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness); |
| 122 | if (ret < 0) |
| 123 | goto out; |
| 124 | ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness); |
| 125 | if (ret < 0) |
| 126 | goto out; |
| 127 | |
| 128 | if (!bl->props.brightness) |
| 129 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00); |
| 130 | else |
| 131 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01); |
| 132 | if (ret < 0) |
| 133 | goto out; |
| 134 | |
| 135 | return bl->props.brightness; |
| 136 | out: |
| 137 | dev_err(pchip->dev, "i2c failed to access registers\n"); |
| 138 | return bl->props.brightness; |
| 139 | } |
| 140 | |
| 141 | static int lm3639_bled_get_brightness(struct backlight_device *bl) |
| 142 | { |
| 143 | int ret; |
| 144 | unsigned int reg_val; |
| 145 | struct lm3639_chip_data *pchip = bl_get_data(bl); |
| 146 | struct lm3639_platform_data *pdata = pchip->pdata; |
| 147 | |
| 148 | if (pdata->pin_pwm) { |
| 149 | if (pdata->pwm_get_intensity) |
| 150 | bl->props.brightness = pdata->pwm_get_intensity(); |
| 151 | else |
| 152 | dev_err(pchip->dev, |
| 153 | "No pwm control func. in plat-data\n"); |
| 154 | return bl->props.brightness; |
| 155 | } |
| 156 | |
| 157 | ret = regmap_read(pchip->regmap, REG_BL_CONF_1, ®_val); |
| 158 | if (ret < 0) |
| 159 | goto out; |
| 160 | if (reg_val & 0x10) |
| 161 | ret = regmap_read(pchip->regmap, REG_BL_CONF_4, ®_val); |
| 162 | else |
| 163 | ret = regmap_read(pchip->regmap, REG_BL_CONF_3, ®_val); |
| 164 | if (ret < 0) |
| 165 | goto out; |
| 166 | bl->props.brightness = reg_val; |
| 167 | |
| 168 | return bl->props.brightness; |
| 169 | out: |
| 170 | dev_err(pchip->dev, "i2c failed to access register\n"); |
| 171 | return bl->props.brightness; |
| 172 | } |
| 173 | |
| 174 | static const struct backlight_ops lm3639_bled_ops = { |
| 175 | .options = BL_CORE_SUSPENDRESUME, |
| 176 | .update_status = lm3639_bled_update_status, |
| 177 | .get_brightness = lm3639_bled_get_brightness, |
| 178 | }; |
| 179 | |
| 180 | /* backlight mapping mode */ |
| 181 | static ssize_t lm3639_bled_mode_store(struct device *dev, |
| 182 | struct device_attribute *devAttr, |
| 183 | const char *buf, size_t size) |
| 184 | { |
| 185 | ssize_t ret; |
| 186 | struct lm3639_chip_data *pchip = dev_get_drvdata(dev); |
| 187 | unsigned int state; |
| 188 | |
| 189 | ret = kstrtouint(buf, 10, &state); |
| 190 | if (ret) |
| 191 | goto out_input; |
| 192 | |
| 193 | if (!state) |
| 194 | ret = |
| 195 | regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10, |
| 196 | 0x00); |
| 197 | else |
| 198 | ret = |
| 199 | regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10, |
| 200 | 0x10); |
| 201 | |
| 202 | if (ret < 0) |
| 203 | goto out; |
| 204 | |
| 205 | return size; |
| 206 | |
| 207 | out: |
| 208 | dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__); |
Axel Lin | dc36d7e | 2012-10-19 13:56:52 -0700 | [diff] [blame] | 209 | return ret; |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 210 | |
| 211 | out_input: |
| 212 | dev_err(pchip->dev, "%s:input conversion fail\n", __func__); |
Axel Lin | dc36d7e | 2012-10-19 13:56:52 -0700 | [diff] [blame] | 213 | return ret; |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 214 | |
| 215 | } |
| 216 | |
Axel Lin | fb08cd9 | 2012-12-17 16:00:59 -0800 | [diff] [blame] | 217 | static DEVICE_ATTR(bled_mode, S_IWUSR, NULL, lm3639_bled_mode_store); |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 218 | |
| 219 | /* torch */ |
| 220 | static void lm3639_torch_brightness_set(struct led_classdev *cdev, |
| 221 | enum led_brightness brightness) |
| 222 | { |
| 223 | int ret; |
| 224 | unsigned int reg_val; |
| 225 | struct lm3639_chip_data *pchip; |
| 226 | |
| 227 | pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch); |
| 228 | |
| 229 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); |
| 230 | if (ret < 0) |
| 231 | goto out; |
| 232 | if (reg_val != 0) |
| 233 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); |
| 234 | |
| 235 | /* brightness 0 means off state */ |
| 236 | if (!brightness) { |
| 237 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00); |
| 238 | if (ret < 0) |
| 239 | goto out; |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | ret = regmap_update_bits(pchip->regmap, |
| 244 | REG_FL_CONF_1, 0x70, (brightness - 1) << 4); |
| 245 | if (ret < 0) |
| 246 | goto out; |
| 247 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02); |
| 248 | if (ret < 0) |
| 249 | goto out; |
| 250 | |
| 251 | return; |
| 252 | out: |
| 253 | dev_err(pchip->dev, "i2c failed to access register\n"); |
| 254 | return; |
| 255 | } |
| 256 | |
| 257 | /* flash */ |
| 258 | static void lm3639_flash_brightness_set(struct led_classdev *cdev, |
| 259 | enum led_brightness brightness) |
| 260 | { |
| 261 | int ret; |
| 262 | unsigned int reg_val; |
| 263 | struct lm3639_chip_data *pchip; |
| 264 | |
| 265 | pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash); |
| 266 | |
| 267 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); |
| 268 | if (ret < 0) |
| 269 | goto out; |
| 270 | if (reg_val != 0) |
| 271 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); |
| 272 | |
| 273 | /* torch off before flash control */ |
| 274 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00); |
| 275 | if (ret < 0) |
| 276 | goto out; |
| 277 | |
| 278 | /* brightness 0 means off state */ |
| 279 | if (!brightness) |
| 280 | return; |
| 281 | |
| 282 | ret = regmap_update_bits(pchip->regmap, |
| 283 | REG_FL_CONF_1, 0x0F, brightness - 1); |
| 284 | if (ret < 0) |
| 285 | goto out; |
| 286 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06); |
| 287 | if (ret < 0) |
| 288 | goto out; |
| 289 | |
| 290 | return; |
| 291 | out: |
| 292 | dev_err(pchip->dev, "i2c failed to access register\n"); |
| 293 | return; |
| 294 | } |
| 295 | |
| 296 | static const struct regmap_config lm3639_regmap = { |
| 297 | .reg_bits = 8, |
| 298 | .val_bits = 8, |
| 299 | .max_register = REG_MAX, |
| 300 | }; |
| 301 | |
Bill Pemberton | 1b9e450 | 2012-11-19 13:21:46 -0500 | [diff] [blame] | 302 | static int lm3639_probe(struct i2c_client *client, |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 303 | const struct i2c_device_id *id) |
| 304 | { |
| 305 | int ret; |
| 306 | struct lm3639_chip_data *pchip; |
| 307 | struct lm3639_platform_data *pdata = client->dev.platform_data; |
| 308 | struct backlight_properties props; |
| 309 | |
| 310 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 311 | dev_err(&client->dev, "i2c functionality check fail.\n"); |
| 312 | return -EOPNOTSUPP; |
| 313 | } |
| 314 | |
| 315 | if (pdata == NULL) { |
| 316 | dev_err(&client->dev, "Needs Platform Data.\n"); |
| 317 | return -ENODATA; |
| 318 | } |
| 319 | |
| 320 | pchip = devm_kzalloc(&client->dev, |
| 321 | sizeof(struct lm3639_chip_data), GFP_KERNEL); |
| 322 | if (!pchip) |
| 323 | return -ENOMEM; |
| 324 | |
| 325 | pchip->pdata = pdata; |
| 326 | pchip->dev = &client->dev; |
| 327 | |
| 328 | pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap); |
| 329 | if (IS_ERR(pchip->regmap)) { |
| 330 | ret = PTR_ERR(pchip->regmap); |
| 331 | dev_err(&client->dev, "fail : allocate register map: %d\n", |
| 332 | ret); |
| 333 | return ret; |
| 334 | } |
| 335 | i2c_set_clientdata(client, pchip); |
| 336 | |
| 337 | /* chip initialize */ |
| 338 | ret = lm3639_chip_init(pchip); |
| 339 | if (ret < 0) { |
| 340 | dev_err(&client->dev, "fail : chip init\n"); |
| 341 | goto err_out; |
| 342 | } |
| 343 | |
| 344 | /* backlight */ |
| 345 | props.type = BACKLIGHT_RAW; |
| 346 | props.brightness = pdata->init_brt_led; |
| 347 | props.max_brightness = pdata->max_brt_led; |
| 348 | pchip->bled = |
| 349 | backlight_device_register("lm3639_bled", pchip->dev, pchip, |
| 350 | &lm3639_bled_ops, &props); |
| 351 | if (IS_ERR(pchip->bled)) { |
| 352 | dev_err(&client->dev, "fail : backlight register\n"); |
Devendra Naga | aea00a6 | 2013-02-21 16:43:52 -0800 | [diff] [blame] | 353 | ret = PTR_ERR(pchip->bled); |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 354 | goto err_out; |
| 355 | } |
| 356 | |
| 357 | ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode); |
| 358 | if (ret < 0) { |
| 359 | dev_err(&client->dev, "failed : add sysfs entries\n"); |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 360 | goto err_bled_mode; |
| 361 | } |
| 362 | |
| 363 | /* flash */ |
| 364 | pchip->cdev_flash.name = "lm3639_flash"; |
| 365 | pchip->cdev_flash.max_brightness = 16; |
| 366 | pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set; |
| 367 | ret = led_classdev_register((struct device *) |
| 368 | &client->dev, &pchip->cdev_flash); |
| 369 | if (ret < 0) { |
| 370 | dev_err(&client->dev, "fail : flash register\n"); |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 371 | goto err_flash; |
| 372 | } |
| 373 | |
| 374 | /* torch */ |
| 375 | pchip->cdev_torch.name = "lm3639_torch"; |
| 376 | pchip->cdev_torch.max_brightness = 8; |
| 377 | pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set; |
| 378 | ret = led_classdev_register((struct device *) |
| 379 | &client->dev, &pchip->cdev_torch); |
| 380 | if (ret < 0) { |
| 381 | dev_err(&client->dev, "fail : torch register\n"); |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 382 | goto err_torch; |
| 383 | } |
| 384 | |
| 385 | return 0; |
| 386 | |
| 387 | err_torch: |
| 388 | led_classdev_unregister(&pchip->cdev_flash); |
| 389 | err_flash: |
| 390 | device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); |
| 391 | err_bled_mode: |
| 392 | backlight_device_unregister(pchip->bled); |
| 393 | err_out: |
| 394 | return ret; |
| 395 | } |
| 396 | |
Bill Pemberton | 7e4b9d0 | 2012-11-19 13:26:34 -0500 | [diff] [blame] | 397 | static int lm3639_remove(struct i2c_client *client) |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 398 | { |
| 399 | struct lm3639_chip_data *pchip = i2c_get_clientdata(client); |
| 400 | |
| 401 | regmap_write(pchip->regmap, REG_ENABLE, 0x00); |
| 402 | |
| 403 | if (&pchip->cdev_torch) |
| 404 | led_classdev_unregister(&pchip->cdev_torch); |
| 405 | if (&pchip->cdev_flash) |
| 406 | led_classdev_unregister(&pchip->cdev_flash); |
| 407 | if (pchip->bled) { |
| 408 | device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); |
| 409 | backlight_device_unregister(pchip->bled); |
| 410 | } |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static const struct i2c_device_id lm3639_id[] = { |
| 415 | {LM3639_NAME, 0}, |
| 416 | {} |
| 417 | }; |
| 418 | |
| 419 | MODULE_DEVICE_TABLE(i2c, lm3639_id); |
| 420 | static struct i2c_driver lm3639_i2c_driver = { |
| 421 | .driver = { |
| 422 | .name = LM3639_NAME, |
| 423 | }, |
| 424 | .probe = lm3639_probe, |
Bill Pemberton | d1723fa | 2012-11-19 13:21:09 -0500 | [diff] [blame] | 425 | .remove = lm3639_remove, |
G.Shark Jeong | 0f59858 | 2012-10-04 17:12:55 -0700 | [diff] [blame] | 426 | .id_table = lm3639_id, |
| 427 | }; |
| 428 | |
| 429 | module_i2c_driver(lm3639_i2c_driver); |
| 430 | |
| 431 | MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639"); |
| 432 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); |
| 433 | MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); |
| 434 | MODULE_LICENSE("GPL v2"); |