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1// SPDX-License-Identifier: GPL-2.0-only2/*3* Simple driver for Texas Instruments LM355x LED Flash driver chip4* Copyright (C) 2012 Texas Instruments5*/6 7#include <linux/module.h>8#include <linux/delay.h>9#include <linux/i2c.h>10#include <linux/leds.h>11#include <linux/slab.h>12#include <linux/platform_device.h>13#include <linux/fs.h>14#include <linux/regmap.h>15#include <linux/platform_data/leds-lm355x.h>16 17enum lm355x_type {18 CHIP_LM3554 = 0,19 CHIP_LM3556,20};21 22enum lm355x_regs {23 REG_FLAG = 0,24 REG_TORCH_CFG,25 REG_TORCH_CTRL,26 REG_STROBE_CFG,27 REG_FLASH_CTRL,28 REG_INDI_CFG,29 REG_INDI_CTRL,30 REG_OPMODE,31 REG_MAX,32};33 34/* operation mode */35enum lm355x_mode {36 MODE_SHDN = 0,37 MODE_INDIC,38 MODE_TORCH,39 MODE_FLASH40};41 42/* register map info. */43struct lm355x_reg_data {44 u8 regno;45 u8 mask;46 u8 shift;47};48 49struct lm355x_chip_data {50 struct device *dev;51 enum lm355x_type type;52 53 struct led_classdev cdev_flash;54 struct led_classdev cdev_torch;55 struct led_classdev cdev_indicator;56 57 struct lm355x_platform_data *pdata;58 struct regmap *regmap;59 struct mutex lock;60 61 unsigned int last_flag;62 struct lm355x_reg_data *regs;63};64 65/* specific indicator function for lm3556 */66enum lm3556_indic_pulse_time {67 PULSE_TIME_0_MS = 0,68 PULSE_TIME_32_MS,69 PULSE_TIME_64_MS,70 PULSE_TIME_92_MS,71 PULSE_TIME_128_MS,72 PULSE_TIME_160_MS,73 PULSE_TIME_196_MS,74 PULSE_TIME_224_MS,75 PULSE_TIME_256_MS,76 PULSE_TIME_288_MS,77 PULSE_TIME_320_MS,78 PULSE_TIME_352_MS,79 PULSE_TIME_384_MS,80 PULSE_TIME_416_MS,81 PULSE_TIME_448_MS,82 PULSE_TIME_480_MS,83};84 85enum lm3556_indic_n_blank {86 INDIC_N_BLANK_0 = 0,87 INDIC_N_BLANK_1,88 INDIC_N_BLANK_2,89 INDIC_N_BLANK_3,90 INDIC_N_BLANK_4,91 INDIC_N_BLANK_5,92 INDIC_N_BLANK_6,93 INDIC_N_BLANK_7,94 INDIC_N_BLANK_8,95 INDIC_N_BLANK_9,96 INDIC_N_BLANK_10,97 INDIC_N_BLANK_11,98 INDIC_N_BLANK_12,99 INDIC_N_BLANK_13,100 INDIC_N_BLANK_14,101 INDIC_N_BLANK_15,102};103 104enum lm3556_indic_period {105 INDIC_PERIOD_0 = 0,106 INDIC_PERIOD_1,107 INDIC_PERIOD_2,108 INDIC_PERIOD_3,109 INDIC_PERIOD_4,110 INDIC_PERIOD_5,111 INDIC_PERIOD_6,112 INDIC_PERIOD_7,113};114 115#define INDIC_PATTERN_SIZE 4116 117struct indicator {118 u8 blinking;119 u8 period_cnt;120};121 122/* indicator pattern data only for lm3556 */123static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {124 [0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1},125 [1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2},126 [2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4},127 [3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7},128};129 130static struct lm355x_reg_data lm3554_regs[REG_MAX] = {131 [REG_FLAG] = {0xD0, 0xBF, 0},132 [REG_TORCH_CFG] = {0xE0, 0x80, 7},133 [REG_TORCH_CTRL] = {0xA0, 0x38, 3},134 [REG_STROBE_CFG] = {0xE0, 0x04, 2},135 [REG_FLASH_CTRL] = {0xB0, 0x78, 3},136 [REG_INDI_CFG] = {0xE0, 0x08, 3},137 [REG_INDI_CTRL] = {0xA0, 0xC0, 6},138 [REG_OPMODE] = {0xA0, 0x03, 0},139};140 141static struct lm355x_reg_data lm3556_regs[REG_MAX] = {142 [REG_FLAG] = {0x0B, 0xFF, 0},143 [REG_TORCH_CFG] = {0x0A, 0x10, 4},144 [REG_TORCH_CTRL] = {0x09, 0x70, 4},145 [REG_STROBE_CFG] = {0x0A, 0x20, 5},146 [REG_FLASH_CTRL] = {0x09, 0x0F, 0},147 [REG_INDI_CFG] = {0xFF, 0xFF, 0},148 [REG_INDI_CTRL] = {0x09, 0x70, 4},149 [REG_OPMODE] = {0x0A, 0x03, 0},150};151 152static char lm355x_name[][I2C_NAME_SIZE] = {153 [CHIP_LM3554] = LM3554_NAME,154 [CHIP_LM3556] = LM3556_NAME,155};156 157/* chip initialize */158static int lm355x_chip_init(struct lm355x_chip_data *chip)159{160 int ret;161 unsigned int reg_val;162 struct lm355x_platform_data *pdata = chip->pdata;163 164 /* input and output pins configuration */165 switch (chip->type) {166 case CHIP_LM3554:167 reg_val = (u32)pdata->pin_tx2 | (u32)pdata->ntc_pin;168 ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);169 if (ret < 0)170 goto out;171 reg_val = (u32)pdata->pass_mode;172 ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);173 if (ret < 0)174 goto out;175 break;176 177 case CHIP_LM3556:178 reg_val = (u32)pdata->pin_tx2 | (u32)pdata->ntc_pin |179 (u32)pdata->pass_mode;180 ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);181 if (ret < 0)182 goto out;183 break;184 default:185 return -ENODATA;186 }187 188 return ret;189out:190 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);191 return ret;192}193 194/* chip control */195static int lm355x_control(struct lm355x_chip_data *chip,196 u8 brightness, enum lm355x_mode opmode)197{198 int ret;199 unsigned int reg_val;200 struct lm355x_platform_data *pdata = chip->pdata;201 struct lm355x_reg_data *preg = chip->regs;202 203 ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);204 if (ret < 0)205 goto out;206 if (chip->last_flag & preg[REG_FLAG].mask)207 dev_info(chip->dev, "%s Last FLAG is 0x%x\n",208 lm355x_name[chip->type],209 chip->last_flag & preg[REG_FLAG].mask);210 /* brightness 0 means shutdown */211 if (!brightness)212 opmode = MODE_SHDN;213 214 switch (opmode) {215 case MODE_TORCH:216 ret =217 regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno,218 preg[REG_TORCH_CTRL].mask,219 (brightness - 1)220 << preg[REG_TORCH_CTRL].shift);221 if (ret < 0)222 goto out;223 224 if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) {225 ret =226 regmap_update_bits(chip->regmap,227 preg[REG_TORCH_CFG].regno,228 preg[REG_TORCH_CFG].mask,229 0x01 <<230 preg[REG_TORCH_CFG].shift);231 if (ret < 0)232 goto out;233 opmode = MODE_SHDN;234 dev_info(chip->dev,235 "torch brt is set - ext. torch pin mode\n");236 }237 break;238 239 case MODE_FLASH:240 241 ret =242 regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno,243 preg[REG_FLASH_CTRL].mask,244 (brightness - 1)245 << preg[REG_FLASH_CTRL].shift);246 if (ret < 0)247 goto out;248 249 if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) {250 if (chip->type == CHIP_LM3554)251 reg_val = 0x00;252 else253 reg_val = 0x01;254 ret =255 regmap_update_bits(chip->regmap,256 preg[REG_STROBE_CFG].regno,257 preg[REG_STROBE_CFG].mask,258 reg_val <<259 preg[REG_STROBE_CFG].shift);260 if (ret < 0)261 goto out;262 opmode = MODE_SHDN;263 dev_info(chip->dev,264 "flash brt is set - ext. strobe pin mode\n");265 }266 break;267 268 case MODE_INDIC:269 ret =270 regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno,271 preg[REG_INDI_CTRL].mask,272 (brightness - 1)273 << preg[REG_INDI_CTRL].shift);274 if (ret < 0)275 goto out;276 277 if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) {278 ret =279 regmap_update_bits(chip->regmap,280 preg[REG_INDI_CFG].regno,281 preg[REG_INDI_CFG].mask,282 0x01 <<283 preg[REG_INDI_CFG].shift);284 if (ret < 0)285 goto out;286 opmode = MODE_SHDN;287 }288 break;289 case MODE_SHDN:290 break;291 default:292 return -EINVAL;293 }294 /* operation mode control */295 ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,296 preg[REG_OPMODE].mask,297 opmode << preg[REG_OPMODE].shift);298 if (ret < 0)299 goto out;300 return ret;301out:302 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);303 return ret;304}305 306/* torch */307 308static int lm355x_torch_brightness_set(struct led_classdev *cdev,309 enum led_brightness brightness)310{311 struct lm355x_chip_data *chip =312 container_of(cdev, struct lm355x_chip_data, cdev_torch);313 int ret;314 315 mutex_lock(&chip->lock);316 ret = lm355x_control(chip, brightness, MODE_TORCH);317 mutex_unlock(&chip->lock);318 return ret;319}320 321/* flash */322 323static int lm355x_strobe_brightness_set(struct led_classdev *cdev,324 enum led_brightness brightness)325{326 struct lm355x_chip_data *chip =327 container_of(cdev, struct lm355x_chip_data, cdev_flash);328 int ret;329 330 mutex_lock(&chip->lock);331 ret = lm355x_control(chip, brightness, MODE_FLASH);332 mutex_unlock(&chip->lock);333 return ret;334}335 336/* indicator */337 338static int lm355x_indicator_brightness_set(struct led_classdev *cdev,339 enum led_brightness brightness)340{341 struct lm355x_chip_data *chip =342 container_of(cdev, struct lm355x_chip_data, cdev_indicator);343 int ret;344 345 mutex_lock(&chip->lock);346 ret = lm355x_control(chip, brightness, MODE_INDIC);347 mutex_unlock(&chip->lock);348 return ret;349}350 351/* indicator pattern only for lm3556*/352static ssize_t pattern_store(struct device *dev,353 struct device_attribute *attr,354 const char *buf, size_t size)355{356 ssize_t ret;357 struct led_classdev *led_cdev = dev_get_drvdata(dev);358 struct lm355x_chip_data *chip =359 container_of(led_cdev, struct lm355x_chip_data, cdev_indicator);360 unsigned int state;361 362 ret = kstrtouint(buf, 10, &state);363 if (ret)364 goto out;365 if (state > INDIC_PATTERN_SIZE - 1)366 state = INDIC_PATTERN_SIZE - 1;367 368 ret = regmap_write(chip->regmap, 0x04,369 indicator_pattern[state].blinking);370 if (ret < 0)371 goto out;372 373 ret = regmap_write(chip->regmap, 0x05,374 indicator_pattern[state].period_cnt);375 if (ret < 0)376 goto out;377 378 return size;379out:380 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);381 return ret;382}383 384static DEVICE_ATTR_WO(pattern);385 386static struct attribute *lm355x_indicator_attrs[] = {387 &dev_attr_pattern.attr,388 NULL389};390ATTRIBUTE_GROUPS(lm355x_indicator);391 392static const struct regmap_config lm355x_regmap = {393 .reg_bits = 8,394 .val_bits = 8,395 .max_register = 0xFF,396};397 398/* module initialize */399static int lm355x_probe(struct i2c_client *client)400{401 const struct i2c_device_id *id = i2c_client_get_device_id(client);402 struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);403 struct lm355x_chip_data *chip;404 405 int err;406 407 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {408 dev_err(&client->dev, "i2c functionality check fail.\n");409 return -EOPNOTSUPP;410 }411 412 if (pdata == NULL) {413 dev_err(&client->dev, "needs Platform Data.\n");414 return -ENODATA;415 }416 417 chip = devm_kzalloc(&client->dev,418 sizeof(struct lm355x_chip_data), GFP_KERNEL);419 if (!chip)420 return -ENOMEM;421 422 chip->dev = &client->dev;423 chip->type = id->driver_data;424 switch (id->driver_data) {425 case CHIP_LM3554:426 chip->regs = lm3554_regs;427 break;428 case CHIP_LM3556:429 chip->regs = lm3556_regs;430 break;431 default:432 return -ENOSYS;433 }434 chip->pdata = pdata;435 436 chip->regmap = devm_regmap_init_i2c(client, &lm355x_regmap);437 if (IS_ERR(chip->regmap)) {438 err = PTR_ERR(chip->regmap);439 dev_err(&client->dev,440 "Failed to allocate register map: %d\n", err);441 return err;442 }443 444 mutex_init(&chip->lock);445 i2c_set_clientdata(client, chip);446 447 err = lm355x_chip_init(chip);448 if (err < 0)449 goto err_out;450 451 /* flash */452 chip->cdev_flash.name = "flash";453 chip->cdev_flash.max_brightness = 16;454 chip->cdev_flash.brightness_set_blocking = lm355x_strobe_brightness_set;455 chip->cdev_flash.default_trigger = "flash";456 err = led_classdev_register(&client->dev, &chip->cdev_flash);457 if (err < 0)458 goto err_out;459 /* torch */460 chip->cdev_torch.name = "torch";461 chip->cdev_torch.max_brightness = 8;462 chip->cdev_torch.brightness_set_blocking = lm355x_torch_brightness_set;463 chip->cdev_torch.default_trigger = "torch";464 err = led_classdev_register(&client->dev, &chip->cdev_torch);465 if (err < 0)466 goto err_create_torch_file;467 /* indicator */468 chip->cdev_indicator.name = "indicator";469 if (id->driver_data == CHIP_LM3554)470 chip->cdev_indicator.max_brightness = 4;471 else472 chip->cdev_indicator.max_brightness = 8;473 chip->cdev_indicator.brightness_set_blocking =474 lm355x_indicator_brightness_set;475 /* indicator pattern control only for LM3556 */476 if (id->driver_data == CHIP_LM3556)477 chip->cdev_indicator.groups = lm355x_indicator_groups;478 err = led_classdev_register(&client->dev, &chip->cdev_indicator);479 if (err < 0)480 goto err_create_indicator_file;481 482 dev_info(&client->dev, "%s is initialized\n",483 lm355x_name[id->driver_data]);484 return 0;485 486err_create_indicator_file:487 led_classdev_unregister(&chip->cdev_torch);488err_create_torch_file:489 led_classdev_unregister(&chip->cdev_flash);490err_out:491 return err;492}493 494static void lm355x_remove(struct i2c_client *client)495{496 struct lm355x_chip_data *chip = i2c_get_clientdata(client);497 struct lm355x_reg_data *preg = chip->regs;498 499 regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);500 led_classdev_unregister(&chip->cdev_indicator);501 led_classdev_unregister(&chip->cdev_torch);502 led_classdev_unregister(&chip->cdev_flash);503 dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);504}505 506static const struct i2c_device_id lm355x_id[] = {507 {LM3554_NAME, CHIP_LM3554},508 {LM3556_NAME, CHIP_LM3556},509 {}510};511 512MODULE_DEVICE_TABLE(i2c, lm355x_id);513 514static struct i2c_driver lm355x_i2c_driver = {515 .driver = {516 .name = LM355x_NAME,517 .pm = NULL,518 },519 .probe = lm355x_probe,520 .remove = lm355x_remove,521 .id_table = lm355x_id,522};523 524module_i2c_driver(lm355x_i2c_driver);525 526MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");527MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");528MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");529MODULE_LICENSE("GPL v2");530