1 // SPDX-License-Identifier: GPL-2.0 2 // TI LM3532 LED driver 3 // Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/ 4 // https://www.ti.com/lit/ds/symlink/lm3532.pdf 5 6 #include <linux/i2c.h> 7 #include <linux/leds.h> 8 #include <linux/slab.h> 9 #include <linux/regmap.h> 10 #include <linux/types.h> 11 #include <linux/regulator/consumer.h> 12 #include <linux/module.h> 13 #include <uapi/linux/uleds.h> 14 #include <linux/gpio/consumer.h> 15 16 #define LM3532_NAME "lm3532-led" 17 #define LM3532_BL_MODE_MANUAL 0x00 18 #define LM3532_BL_MODE_ALS 0x01 19 20 #define LM3532_REG_OUTPUT_CFG 0x10 21 #define LM3532_REG_STARTSHUT_RAMP 0x11 22 #define LM3532_REG_RT_RAMP 0x12 23 #define LM3532_REG_PWM_A_CFG 0x13 24 #define LM3532_REG_PWM_B_CFG 0x14 25 #define LM3532_REG_PWM_C_CFG 0x15 26 #define LM3532_REG_ZONE_CFG_A 0x16 27 #define LM3532_REG_CTRL_A_FS_CURR 0x17 28 #define LM3532_REG_ZONE_CFG_B 0x18 29 #define LM3532_REG_CTRL_B_FS_CURR 0x19 30 #define LM3532_REG_ZONE_CFG_C 0x1a 31 #define LM3532_REG_CTRL_C_FS_CURR 0x1b 32 #define LM3532_REG_ENABLE 0x1d 33 #define LM3532_ALS_CONFIG 0x23 34 #define LM3532_REG_ZN_0_HI 0x60 35 #define LM3532_REG_ZN_0_LO 0x61 36 #define LM3532_REG_ZN_1_HI 0x62 37 #define LM3532_REG_ZN_1_LO 0x63 38 #define LM3532_REG_ZN_2_HI 0x64 39 #define LM3532_REG_ZN_2_LO 0x65 40 #define LM3532_REG_ZN_3_HI 0x66 41 #define LM3532_REG_ZN_3_LO 0x67 42 #define LM3532_REG_ZONE_TRGT_A 0x70 43 #define LM3532_REG_ZONE_TRGT_B 0x75 44 #define LM3532_REG_ZONE_TRGT_C 0x7a 45 #define LM3532_REG_MAX 0x7e 46 47 /* Control Enable */ 48 #define LM3532_CTRL_A_ENABLE BIT(0) 49 #define LM3532_CTRL_B_ENABLE BIT(1) 50 #define LM3532_CTRL_C_ENABLE BIT(2) 51 52 /* PWM Zone Control */ 53 #define LM3532_PWM_ZONE_MASK 0x7c 54 #define LM3532_PWM_ZONE_0_EN BIT(2) 55 #define LM3532_PWM_ZONE_1_EN BIT(3) 56 #define LM3532_PWM_ZONE_2_EN BIT(4) 57 #define LM3532_PWM_ZONE_3_EN BIT(5) 58 #define LM3532_PWM_ZONE_4_EN BIT(6) 59 60 /* Brightness Configuration */ 61 #define LM3532_I2C_CTRL BIT(0) 62 #define LM3532_ALS_CTRL 0 63 #define LM3532_LINEAR_MAP BIT(1) 64 #define LM3532_ZONE_MASK (BIT(2) | BIT(3) | BIT(4)) 65 #define LM3532_ZONE_0 0 66 #define LM3532_ZONE_1 BIT(2) 67 #define LM3532_ZONE_2 BIT(3) 68 #define LM3532_ZONE_3 (BIT(2) | BIT(3)) 69 #define LM3532_ZONE_4 BIT(4) 70 71 #define LM3532_ENABLE_ALS BIT(3) 72 #define LM3532_ALS_SEL_SHIFT 6 73 74 /* Zone Boundary Register */ 75 #define LM3532_ALS_WINDOW_mV 2000 76 #define LM3532_ALS_ZB_MAX 4 77 #define LM3532_ALS_OFFSET_mV 2 78 79 #define LM3532_CONTROL_A 0 80 #define LM3532_CONTROL_B 1 81 #define LM3532_CONTROL_C 2 82 #define LM3532_MAX_CONTROL_BANKS 3 83 #define LM3532_MAX_LED_STRINGS 3 84 85 #define LM3532_OUTPUT_CFG_MASK 0x3 86 #define LM3532_BRT_VAL_ADJUST 8 87 #define LM3532_RAMP_DOWN_SHIFT 3 88 89 #define LM3532_NUM_RAMP_VALS 8 90 #define LM3532_NUM_AVG_VALS 8 91 #define LM3532_NUM_IMP_VALS 32 92 93 #define LM3532_FS_CURR_MIN 5000 94 #define LM3532_FS_CURR_MAX 29800 95 #define LM3532_FS_CURR_STEP 800 96 97 /* 98 * struct lm3532_als_data 99 * @config - value of ALS configuration register 100 * @als1_imp_sel - value of ALS1 resistor select register 101 * @als2_imp_sel - value of ALS2 resistor select register 102 * @als_avrg_time - ALS averaging time 103 * @als_input_mode - ALS input mode for brightness control 104 * @als_vmin - Minimum ALS voltage 105 * @als_vmax - Maximum ALS voltage 106 * @zone_lo - values of ALS lo ZB(Zone Boundary) registers 107 * @zone_hi - values of ALS hi ZB(Zone Boundary) registers 108 */ 109 struct lm3532_als_data { 110 u8 config; 111 u8 als1_imp_sel; 112 u8 als2_imp_sel; 113 u8 als_avrg_time; 114 u8 als_input_mode; 115 u32 als_vmin; 116 u32 als_vmax; 117 u8 zones_lo[LM3532_ALS_ZB_MAX]; 118 u8 zones_hi[LM3532_ALS_ZB_MAX]; 119 }; 120 121 /** 122 * struct lm3532_led 123 * @led_dev: led class device 124 * @priv - Pointer the device data structure 125 * @control_bank - Control bank the LED is associated to 126 * @mode - Mode of the LED string 127 * @ctrl_brt_pointer - Zone target register that controls the sink 128 * @num_leds - Number of LED strings are supported in this array 129 * @full_scale_current - The full-scale current setting for the current sink. 130 * @led_strings - The LED strings supported in this array 131 * @enabled - Enabled status 132 * @label - LED label 133 */ 134 struct lm3532_led { 135 struct led_classdev led_dev; 136 struct lm3532_data *priv; 137 138 int control_bank; 139 int mode; 140 int ctrl_brt_pointer; 141 int num_leds; 142 int full_scale_current; 143 unsigned int enabled:1; 144 u32 led_strings[LM3532_MAX_CONTROL_BANKS]; 145 char label[LED_MAX_NAME_SIZE]; 146 }; 147 148 /** 149 * struct lm3532_data 150 * @enable_gpio - Hardware enable gpio 151 * @regulator: regulator 152 * @client: i2c client 153 * @regmap - Devices register map 154 * @dev - Pointer to the devices device struct 155 * @lock - Lock for reading/writing the device 156 * @als_data - Pointer to the als data struct 157 * @runtime_ramp_up - Runtime ramp up setting 158 * @runtime_ramp_down - Runtime ramp down setting 159 * @leds - Array of LED strings 160 */ 161 struct lm3532_data { 162 struct gpio_desc *enable_gpio; 163 struct regulator *regulator; 164 struct i2c_client *client; 165 struct regmap *regmap; 166 struct device *dev; 167 struct mutex lock; 168 169 struct lm3532_als_data *als_data; 170 171 u32 runtime_ramp_up; 172 u32 runtime_ramp_down; 173 174 struct lm3532_led leds[]; 175 }; 176 177 static const struct reg_default lm3532_reg_defs[] = { 178 {LM3532_REG_OUTPUT_CFG, 0xe4}, 179 {LM3532_REG_STARTSHUT_RAMP, 0xc0}, 180 {LM3532_REG_RT_RAMP, 0xc0}, 181 {LM3532_REG_PWM_A_CFG, 0x82}, 182 {LM3532_REG_PWM_B_CFG, 0x82}, 183 {LM3532_REG_PWM_C_CFG, 0x82}, 184 {LM3532_REG_ZONE_CFG_A, 0xf1}, 185 {LM3532_REG_CTRL_A_FS_CURR, 0xf3}, 186 {LM3532_REG_ZONE_CFG_B, 0xf1}, 187 {LM3532_REG_CTRL_B_FS_CURR, 0xf3}, 188 {LM3532_REG_ZONE_CFG_C, 0xf1}, 189 {LM3532_REG_CTRL_C_FS_CURR, 0xf3}, 190 {LM3532_REG_ENABLE, 0xf8}, 191 {LM3532_ALS_CONFIG, 0x44}, 192 {LM3532_REG_ZN_0_HI, 0x35}, 193 {LM3532_REG_ZN_0_LO, 0x33}, 194 {LM3532_REG_ZN_1_HI, 0x6a}, 195 {LM3532_REG_ZN_1_LO, 0x66}, 196 {LM3532_REG_ZN_2_HI, 0xa1}, 197 {LM3532_REG_ZN_2_LO, 0x99}, 198 {LM3532_REG_ZN_3_HI, 0xdc}, 199 {LM3532_REG_ZN_3_LO, 0xcc}, 200 }; 201 202 static const struct regmap_config lm3532_regmap_config = { 203 .reg_bits = 8, 204 .val_bits = 8, 205 206 .max_register = LM3532_REG_MAX, 207 .reg_defaults = lm3532_reg_defs, 208 .num_reg_defaults = ARRAY_SIZE(lm3532_reg_defs), 209 .cache_type = REGCACHE_FLAT, 210 }; 211 212 static const int als_imp_table[LM3532_NUM_IMP_VALS] = {37000, 18500, 12330, 213 92500, 7400, 6170, 5290, 214 4630, 4110, 3700, 3360, 215 3080, 2850, 2640, 2440, 216 2310, 2180, 2060, 1950, 217 1850, 1760, 1680, 1610, 218 1540, 1480, 1420, 1370, 219 1320, 1280, 1230, 1190}; 220 static int lm3532_get_als_imp_index(int als_imped) 221 { 222 int i; 223 224 if (als_imped > als_imp_table[1]) 225 return 0; 226 227 if (als_imped < als_imp_table[LM3532_NUM_IMP_VALS - 1]) 228 return LM3532_NUM_IMP_VALS - 1; 229 230 for (i = 1; i < LM3532_NUM_IMP_VALS; i++) { 231 if (als_imped == als_imp_table[i]) 232 return i; 233 234 /* Find an approximate index by looking up the table */ 235 if (als_imped < als_imp_table[i - 1] && 236 als_imped > als_imp_table[i]) { 237 if (als_imped - als_imp_table[i - 1] < 238 als_imp_table[i] - als_imped) 239 return i + 1; 240 else 241 return i; 242 } 243 } 244 245 return -EINVAL; 246 } 247 248 static int lm3532_get_index(const int table[], int size, int value) 249 { 250 int i; 251 252 for (i = 1; i < size; i++) { 253 if (value == table[i]) 254 return i; 255 256 /* Find an approximate index by looking up the table */ 257 if (value > table[i - 1] && 258 value < table[i]) { 259 if (value - table[i - 1] < table[i] - value) 260 return i - 1; 261 else 262 return i; 263 } 264 } 265 266 return -EINVAL; 267 } 268 269 static const int als_avrg_table[LM3532_NUM_AVG_VALS] = {17920, 35840, 71680, 270 1433360, 286720, 573440, 271 1146880, 2293760}; 272 static int lm3532_get_als_avg_index(int avg_time) 273 { 274 if (avg_time <= als_avrg_table[0]) 275 return 0; 276 277 if (avg_time > als_avrg_table[LM3532_NUM_AVG_VALS - 1]) 278 return LM3532_NUM_AVG_VALS - 1; 279 280 return lm3532_get_index(&als_avrg_table[0], LM3532_NUM_AVG_VALS, 281 avg_time); 282 } 283 284 static const int ramp_table[LM3532_NUM_RAMP_VALS] = { 8, 1024, 2048, 4096, 8192, 285 16384, 32768, 65536}; 286 static int lm3532_get_ramp_index(int ramp_time) 287 { 288 if (ramp_time <= ramp_table[0]) 289 return 0; 290 291 if (ramp_time > ramp_table[LM3532_NUM_RAMP_VALS - 1]) 292 return LM3532_NUM_RAMP_VALS - 1; 293 294 return lm3532_get_index(&ramp_table[0], LM3532_NUM_RAMP_VALS, 295 ramp_time); 296 } 297 298 /* Caller must take care of locking */ 299 static int lm3532_led_enable(struct lm3532_led *led_data) 300 { 301 int ctrl_en_val = BIT(led_data->control_bank); 302 int ret; 303 304 if (led_data->enabled) 305 return 0; 306 307 ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE, 308 ctrl_en_val, ctrl_en_val); 309 if (ret) { 310 dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret); 311 return ret; 312 } 313 314 ret = regulator_enable(led_data->priv->regulator); 315 if (ret < 0) 316 return ret; 317 318 led_data->enabled = 1; 319 320 return 0; 321 } 322 323 /* Caller must take care of locking */ 324 static int lm3532_led_disable(struct lm3532_led *led_data) 325 { 326 int ctrl_en_val = BIT(led_data->control_bank); 327 int ret; 328 329 if (!led_data->enabled) 330 return 0; 331 332 ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE, 333 ctrl_en_val, 0); 334 if (ret) { 335 dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret); 336 return ret; 337 } 338 339 ret = regulator_disable(led_data->priv->regulator); 340 if (ret < 0) 341 return ret; 342 343 led_data->enabled = 0; 344 345 return 0; 346 } 347 348 static int lm3532_brightness_set(struct led_classdev *led_cdev, 349 enum led_brightness brt_val) 350 { 351 struct lm3532_led *led = 352 container_of(led_cdev, struct lm3532_led, led_dev); 353 u8 brightness_reg; 354 int ret; 355 356 mutex_lock(&led->priv->lock); 357 358 if (led->mode == LM3532_ALS_CTRL) { 359 if (brt_val > LED_OFF) 360 ret = lm3532_led_enable(led); 361 else 362 ret = lm3532_led_disable(led); 363 364 goto unlock; 365 } 366 367 if (brt_val == LED_OFF) { 368 ret = lm3532_led_disable(led); 369 goto unlock; 370 } 371 372 ret = lm3532_led_enable(led); 373 if (ret) 374 goto unlock; 375 376 brightness_reg = LM3532_REG_ZONE_TRGT_A + led->control_bank * 5 + 377 (led->ctrl_brt_pointer >> 2); 378 379 ret = regmap_write(led->priv->regmap, brightness_reg, brt_val); 380 381 unlock: 382 mutex_unlock(&led->priv->lock); 383 return ret; 384 } 385 386 static int lm3532_init_registers(struct lm3532_led *led) 387 { 388 struct lm3532_data *drvdata = led->priv; 389 unsigned int runtime_ramp_val; 390 unsigned int output_cfg_val = 0; 391 unsigned int output_cfg_shift = 0; 392 unsigned int output_cfg_mask = 0; 393 unsigned int brightness_config_reg; 394 unsigned int brightness_config_val; 395 int fs_current_reg; 396 int fs_current_val; 397 int ret, i; 398 399 if (drvdata->enable_gpio) 400 gpiod_direction_output(drvdata->enable_gpio, 1); 401 402 brightness_config_reg = LM3532_REG_ZONE_CFG_A + led->control_bank * 2; 403 /* 404 * This could be hard coded to the default value but the control 405 * brightness register may have changed during boot. 406 */ 407 ret = regmap_read(drvdata->regmap, brightness_config_reg, 408 &led->ctrl_brt_pointer); 409 if (ret) 410 return ret; 411 412 led->ctrl_brt_pointer &= LM3532_ZONE_MASK; 413 brightness_config_val = led->ctrl_brt_pointer | led->mode; 414 ret = regmap_write(drvdata->regmap, brightness_config_reg, 415 brightness_config_val); 416 if (ret) 417 return ret; 418 419 if (led->full_scale_current) { 420 fs_current_reg = LM3532_REG_CTRL_A_FS_CURR + led->control_bank * 2; 421 fs_current_val = (led->full_scale_current - LM3532_FS_CURR_MIN) / 422 LM3532_FS_CURR_STEP; 423 424 ret = regmap_write(drvdata->regmap, fs_current_reg, 425 fs_current_val); 426 if (ret) 427 return ret; 428 } 429 430 for (i = 0; i < led->num_leds; i++) { 431 output_cfg_shift = led->led_strings[i] * 2; 432 output_cfg_val |= (led->control_bank << output_cfg_shift); 433 output_cfg_mask |= LM3532_OUTPUT_CFG_MASK << output_cfg_shift; 434 } 435 436 ret = regmap_update_bits(drvdata->regmap, LM3532_REG_OUTPUT_CFG, 437 output_cfg_mask, output_cfg_val); 438 if (ret) 439 return ret; 440 441 runtime_ramp_val = drvdata->runtime_ramp_up | 442 (drvdata->runtime_ramp_down << LM3532_RAMP_DOWN_SHIFT); 443 444 return regmap_write(drvdata->regmap, LM3532_REG_RT_RAMP, 445 runtime_ramp_val); 446 } 447 448 static int lm3532_als_configure(struct lm3532_data *priv, 449 struct lm3532_led *led) 450 { 451 struct lm3532_als_data *als = priv->als_data; 452 u32 als_vmin, als_vmax, als_vstep; 453 int zone_reg = LM3532_REG_ZN_0_HI; 454 int ret; 455 int i; 456 457 als_vmin = als->als_vmin; 458 als_vmax = als->als_vmax; 459 460 als_vstep = (als_vmax - als_vmin) / ((LM3532_ALS_ZB_MAX + 1) * 2); 461 462 for (i = 0; i < LM3532_ALS_ZB_MAX; i++) { 463 als->zones_lo[i] = ((als_vmin + als_vstep + (i * als_vstep)) * 464 LED_FULL) / 1000; 465 als->zones_hi[i] = ((als_vmin + LM3532_ALS_OFFSET_mV + 466 als_vstep + (i * als_vstep)) * LED_FULL) / 1000; 467 468 zone_reg = LM3532_REG_ZN_0_HI + i * 2; 469 ret = regmap_write(priv->regmap, zone_reg, als->zones_lo[i]); 470 if (ret) 471 return ret; 472 473 zone_reg += 1; 474 ret = regmap_write(priv->regmap, zone_reg, als->zones_hi[i]); 475 if (ret) 476 return ret; 477 } 478 479 als->config = (als->als_avrg_time | (LM3532_ENABLE_ALS) | 480 (als->als_input_mode << LM3532_ALS_SEL_SHIFT)); 481 482 return regmap_write(priv->regmap, LM3532_ALS_CONFIG, als->config); 483 } 484 485 static int lm3532_parse_als(struct lm3532_data *priv) 486 { 487 struct lm3532_als_data *als; 488 int als_avg_time; 489 int als_impedance; 490 int ret; 491 492 als = devm_kzalloc(priv->dev, sizeof(*als), GFP_KERNEL); 493 if (als == NULL) 494 return -ENOMEM; 495 496 ret = device_property_read_u32(&priv->client->dev, "ti,als-vmin", 497 &als->als_vmin); 498 if (ret) 499 als->als_vmin = 0; 500 501 ret = device_property_read_u32(&priv->client->dev, "ti,als-vmax", 502 &als->als_vmax); 503 if (ret) 504 als->als_vmax = LM3532_ALS_WINDOW_mV; 505 506 if (als->als_vmax > LM3532_ALS_WINDOW_mV) { 507 ret = -EINVAL; 508 return ret; 509 } 510 511 ret = device_property_read_u32(&priv->client->dev, "ti,als1-imp-sel", 512 &als_impedance); 513 if (ret) 514 als->als1_imp_sel = 0; 515 else 516 als->als1_imp_sel = lm3532_get_als_imp_index(als_impedance); 517 518 ret = device_property_read_u32(&priv->client->dev, "ti,als2-imp-sel", 519 &als_impedance); 520 if (ret) 521 als->als2_imp_sel = 0; 522 else 523 als->als2_imp_sel = lm3532_get_als_imp_index(als_impedance); 524 525 ret = device_property_read_u32(&priv->client->dev, "ti,als-avrg-time-us", 526 &als_avg_time); 527 if (ret) 528 als->als_avrg_time = 0; 529 else 530 als->als_avrg_time = lm3532_get_als_avg_index(als_avg_time); 531 532 ret = device_property_read_u8(&priv->client->dev, "ti,als-input-mode", 533 &als->als_input_mode); 534 if (ret) 535 als->als_input_mode = 0; 536 537 if (als->als_input_mode > LM3532_BL_MODE_ALS) { 538 ret = -EINVAL; 539 return ret; 540 } 541 542 priv->als_data = als; 543 544 return ret; 545 } 546 547 static int lm3532_parse_node(struct lm3532_data *priv) 548 { 549 struct fwnode_handle *child = NULL; 550 struct lm3532_led *led; 551 const char *name; 552 int control_bank; 553 u32 ramp_time; 554 size_t i = 0; 555 int ret; 556 557 priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev, 558 "enable", GPIOD_OUT_LOW); 559 if (IS_ERR(priv->enable_gpio)) 560 priv->enable_gpio = NULL; 561 562 priv->regulator = devm_regulator_get(&priv->client->dev, "vin"); 563 if (IS_ERR(priv->regulator)) 564 priv->regulator = NULL; 565 566 ret = device_property_read_u32(&priv->client->dev, "ramp-up-us", 567 &ramp_time); 568 if (ret) 569 dev_info(&priv->client->dev, "ramp-up-ms property missing\n"); 570 else 571 priv->runtime_ramp_up = lm3532_get_ramp_index(ramp_time); 572 573 ret = device_property_read_u32(&priv->client->dev, "ramp-down-us", 574 &ramp_time); 575 if (ret) 576 dev_info(&priv->client->dev, "ramp-down-ms property missing\n"); 577 else 578 priv->runtime_ramp_down = lm3532_get_ramp_index(ramp_time); 579 580 device_for_each_child_node(priv->dev, child) { 581 struct led_init_data idata = { 582 .fwnode = child, 583 .default_label = ":", 584 .devicename = priv->client->name, 585 }; 586 587 led = &priv->leds[i]; 588 589 ret = fwnode_property_read_u32(child, "reg", &control_bank); 590 if (ret) { 591 dev_err(&priv->client->dev, "reg property missing\n"); 592 fwnode_handle_put(child); 593 goto child_out; 594 } 595 596 if (control_bank > LM3532_CONTROL_C) { 597 dev_err(&priv->client->dev, "Control bank invalid\n"); 598 continue; 599 } 600 601 led->control_bank = control_bank; 602 603 ret = fwnode_property_read_u32(child, "ti,led-mode", 604 &led->mode); 605 if (ret) { 606 dev_err(&priv->client->dev, "ti,led-mode property missing\n"); 607 fwnode_handle_put(child); 608 goto child_out; 609 } 610 611 if (fwnode_property_present(child, "led-max-microamp") && 612 fwnode_property_read_u32(child, "led-max-microamp", 613 &led->full_scale_current)) 614 dev_err(&priv->client->dev, 615 "Failed getting led-max-microamp\n"); 616 else 617 led->full_scale_current = min(led->full_scale_current, 618 LM3532_FS_CURR_MAX); 619 620 if (led->mode == LM3532_BL_MODE_ALS) { 621 led->mode = LM3532_ALS_CTRL; 622 ret = lm3532_parse_als(priv); 623 if (ret) 624 dev_err(&priv->client->dev, "Failed to parse als\n"); 625 else 626 lm3532_als_configure(priv, led); 627 } else { 628 led->mode = LM3532_I2C_CTRL; 629 } 630 631 led->num_leds = fwnode_property_count_u32(child, "led-sources"); 632 if (led->num_leds > LM3532_MAX_LED_STRINGS) { 633 dev_err(&priv->client->dev, "Too many LED string defined\n"); 634 continue; 635 } 636 637 ret = fwnode_property_read_u32_array(child, "led-sources", 638 led->led_strings, 639 led->num_leds); 640 if (ret) { 641 dev_err(&priv->client->dev, "led-sources property missing\n"); 642 fwnode_handle_put(child); 643 goto child_out; 644 } 645 646 fwnode_property_read_string(child, "linux,default-trigger", 647 &led->led_dev.default_trigger); 648 649 ret = fwnode_property_read_string(child, "label", &name); 650 if (ret) 651 snprintf(led->label, sizeof(led->label), 652 "%s::", priv->client->name); 653 else 654 snprintf(led->label, sizeof(led->label), 655 "%s:%s", priv->client->name, name); 656 657 led->priv = priv; 658 led->led_dev.name = led->label; 659 led->led_dev.brightness_set_blocking = lm3532_brightness_set; 660 661 ret = devm_led_classdev_register_ext(priv->dev, &led->led_dev, &idata); 662 if (ret) { 663 dev_err(&priv->client->dev, "led register err: %d\n", 664 ret); 665 fwnode_handle_put(child); 666 goto child_out; 667 } 668 669 ret = lm3532_init_registers(led); 670 if (ret) { 671 dev_err(&priv->client->dev, "register init err: %d\n", 672 ret); 673 fwnode_handle_put(child); 674 goto child_out; 675 } 676 677 i++; 678 } 679 680 child_out: 681 return ret; 682 } 683 684 static int lm3532_probe(struct i2c_client *client, 685 const struct i2c_device_id *id) 686 { 687 struct lm3532_data *drvdata; 688 int ret = 0; 689 int count; 690 691 count = device_get_child_node_count(&client->dev); 692 if (!count) { 693 dev_err(&client->dev, "LEDs are not defined in device tree!"); 694 return -ENODEV; 695 } 696 697 drvdata = devm_kzalloc(&client->dev, struct_size(drvdata, leds, count), 698 GFP_KERNEL); 699 if (drvdata == NULL) 700 return -ENOMEM; 701 702 drvdata->client = client; 703 drvdata->dev = &client->dev; 704 705 drvdata->regmap = devm_regmap_init_i2c(client, &lm3532_regmap_config); 706 if (IS_ERR(drvdata->regmap)) { 707 ret = PTR_ERR(drvdata->regmap); 708 dev_err(&client->dev, "Failed to allocate register map: %d\n", 709 ret); 710 return ret; 711 } 712 713 mutex_init(&drvdata->lock); 714 i2c_set_clientdata(client, drvdata); 715 716 ret = lm3532_parse_node(drvdata); 717 if (ret) { 718 dev_err(&client->dev, "Failed to parse node\n"); 719 return ret; 720 } 721 722 return ret; 723 } 724 725 static int lm3532_remove(struct i2c_client *client) 726 { 727 struct lm3532_data *drvdata = i2c_get_clientdata(client); 728 729 mutex_destroy(&drvdata->lock); 730 731 if (drvdata->enable_gpio) 732 gpiod_direction_output(drvdata->enable_gpio, 0); 733 734 return 0; 735 } 736 737 static const struct of_device_id of_lm3532_leds_match[] = { 738 { .compatible = "ti,lm3532", }, 739 {}, 740 }; 741 MODULE_DEVICE_TABLE(of, of_lm3532_leds_match); 742 743 static const struct i2c_device_id lm3532_id[] = { 744 {LM3532_NAME, 0}, 745 {} 746 }; 747 MODULE_DEVICE_TABLE(i2c, lm3532_id); 748 749 static struct i2c_driver lm3532_i2c_driver = { 750 .probe = lm3532_probe, 751 .remove = lm3532_remove, 752 .id_table = lm3532_id, 753 .driver = { 754 .name = LM3532_NAME, 755 .of_match_table = of_lm3532_leds_match, 756 }, 757 }; 758 module_i2c_driver(lm3532_i2c_driver); 759 760 MODULE_DESCRIPTION("Back Light driver for LM3532"); 761 MODULE_LICENSE("GPL v2"); 762 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); 763