leds-lm3532.c (18935B)
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 */ 109struct 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 */ 133struct lm3532_led { 134 struct led_classdev led_dev; 135 struct lm3532_data *priv; 136 137 int control_bank; 138 int mode; 139 int ctrl_brt_pointer; 140 int num_leds; 141 int full_scale_current; 142 unsigned int enabled:1; 143 u32 led_strings[LM3532_MAX_CONTROL_BANKS]; 144}; 145 146/** 147 * struct lm3532_data 148 * @enable_gpio: Hardware enable gpio 149 * @regulator: regulator 150 * @client: i2c client 151 * @regmap: Devices register map 152 * @dev: Pointer to the devices device struct 153 * @lock: Lock for reading/writing the device 154 * @als_data: Pointer to the als data struct 155 * @runtime_ramp_up: Runtime ramp up setting 156 * @runtime_ramp_down: Runtime ramp down setting 157 * @leds: Array of LED strings 158 */ 159struct lm3532_data { 160 struct gpio_desc *enable_gpio; 161 struct regulator *regulator; 162 struct i2c_client *client; 163 struct regmap *regmap; 164 struct device *dev; 165 struct mutex lock; 166 167 struct lm3532_als_data *als_data; 168 169 u32 runtime_ramp_up; 170 u32 runtime_ramp_down; 171 172 struct lm3532_led leds[]; 173}; 174 175static const struct reg_default lm3532_reg_defs[] = { 176 {LM3532_REG_OUTPUT_CFG, 0xe4}, 177 {LM3532_REG_STARTSHUT_RAMP, 0xc0}, 178 {LM3532_REG_RT_RAMP, 0xc0}, 179 {LM3532_REG_PWM_A_CFG, 0x82}, 180 {LM3532_REG_PWM_B_CFG, 0x82}, 181 {LM3532_REG_PWM_C_CFG, 0x82}, 182 {LM3532_REG_ZONE_CFG_A, 0xf1}, 183 {LM3532_REG_CTRL_A_FS_CURR, 0xf3}, 184 {LM3532_REG_ZONE_CFG_B, 0xf1}, 185 {LM3532_REG_CTRL_B_FS_CURR, 0xf3}, 186 {LM3532_REG_ZONE_CFG_C, 0xf1}, 187 {LM3532_REG_CTRL_C_FS_CURR, 0xf3}, 188 {LM3532_REG_ENABLE, 0xf8}, 189 {LM3532_ALS_CONFIG, 0x44}, 190 {LM3532_REG_ZN_0_HI, 0x35}, 191 {LM3532_REG_ZN_0_LO, 0x33}, 192 {LM3532_REG_ZN_1_HI, 0x6a}, 193 {LM3532_REG_ZN_1_LO, 0x66}, 194 {LM3532_REG_ZN_2_HI, 0xa1}, 195 {LM3532_REG_ZN_2_LO, 0x99}, 196 {LM3532_REG_ZN_3_HI, 0xdc}, 197 {LM3532_REG_ZN_3_LO, 0xcc}, 198}; 199 200static const struct regmap_config lm3532_regmap_config = { 201 .reg_bits = 8, 202 .val_bits = 8, 203 204 .max_register = LM3532_REG_MAX, 205 .reg_defaults = lm3532_reg_defs, 206 .num_reg_defaults = ARRAY_SIZE(lm3532_reg_defs), 207 .cache_type = REGCACHE_FLAT, 208}; 209 210static const int als_imp_table[LM3532_NUM_IMP_VALS] = {37000, 18500, 12330, 211 92500, 7400, 6170, 5290, 212 4630, 4110, 3700, 3360, 213 3080, 2850, 2640, 2440, 214 2310, 2180, 2060, 1950, 215 1850, 1760, 1680, 1610, 216 1540, 1480, 1420, 1370, 217 1320, 1280, 1230, 1190}; 218static int lm3532_get_als_imp_index(int als_imped) 219{ 220 int i; 221 222 if (als_imped > als_imp_table[1]) 223 return 0; 224 225 if (als_imped < als_imp_table[LM3532_NUM_IMP_VALS - 1]) 226 return LM3532_NUM_IMP_VALS - 1; 227 228 for (i = 1; i < LM3532_NUM_IMP_VALS; i++) { 229 if (als_imped == als_imp_table[i]) 230 return i; 231 232 /* Find an approximate index by looking up the table */ 233 if (als_imped < als_imp_table[i - 1] && 234 als_imped > als_imp_table[i]) { 235 if (als_imped - als_imp_table[i - 1] < 236 als_imp_table[i] - als_imped) 237 return i + 1; 238 else 239 return i; 240 } 241 } 242 243 return -EINVAL; 244} 245 246static int lm3532_get_index(const int table[], int size, int value) 247{ 248 int i; 249 250 for (i = 1; i < size; i++) { 251 if (value == table[i]) 252 return i; 253 254 /* Find an approximate index by looking up the table */ 255 if (value > table[i - 1] && 256 value < table[i]) { 257 if (value - table[i - 1] < table[i] - value) 258 return i - 1; 259 else 260 return i; 261 } 262 } 263 264 return -EINVAL; 265} 266 267static const int als_avrg_table[LM3532_NUM_AVG_VALS] = {17920, 35840, 71680, 268 1433360, 286720, 573440, 269 1146880, 2293760}; 270static int lm3532_get_als_avg_index(int avg_time) 271{ 272 if (avg_time <= als_avrg_table[0]) 273 return 0; 274 275 if (avg_time > als_avrg_table[LM3532_NUM_AVG_VALS - 1]) 276 return LM3532_NUM_AVG_VALS - 1; 277 278 return lm3532_get_index(&als_avrg_table[0], LM3532_NUM_AVG_VALS, 279 avg_time); 280} 281 282static const int ramp_table[LM3532_NUM_RAMP_VALS] = { 8, 1024, 2048, 4096, 8192, 283 16384, 32768, 65536}; 284static int lm3532_get_ramp_index(int ramp_time) 285{ 286 if (ramp_time <= ramp_table[0]) 287 return 0; 288 289 if (ramp_time > ramp_table[LM3532_NUM_RAMP_VALS - 1]) 290 return LM3532_NUM_RAMP_VALS - 1; 291 292 return lm3532_get_index(&ramp_table[0], LM3532_NUM_RAMP_VALS, 293 ramp_time); 294} 295 296/* Caller must take care of locking */ 297static int lm3532_led_enable(struct lm3532_led *led_data) 298{ 299 int ctrl_en_val = BIT(led_data->control_bank); 300 int ret; 301 302 if (led_data->enabled) 303 return 0; 304 305 ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE, 306 ctrl_en_val, ctrl_en_val); 307 if (ret) { 308 dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret); 309 return ret; 310 } 311 312 ret = regulator_enable(led_data->priv->regulator); 313 if (ret < 0) 314 return ret; 315 316 led_data->enabled = 1; 317 318 return 0; 319} 320 321/* Caller must take care of locking */ 322static int lm3532_led_disable(struct lm3532_led *led_data) 323{ 324 int ctrl_en_val = BIT(led_data->control_bank); 325 int ret; 326 327 if (!led_data->enabled) 328 return 0; 329 330 ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE, 331 ctrl_en_val, 0); 332 if (ret) { 333 dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret); 334 return ret; 335 } 336 337 ret = regulator_disable(led_data->priv->regulator); 338 if (ret < 0) 339 return ret; 340 341 led_data->enabled = 0; 342 343 return 0; 344} 345 346static int lm3532_brightness_set(struct led_classdev *led_cdev, 347 enum led_brightness brt_val) 348{ 349 struct lm3532_led *led = 350 container_of(led_cdev, struct lm3532_led, led_dev); 351 u8 brightness_reg; 352 int ret; 353 354 mutex_lock(&led->priv->lock); 355 356 if (led->mode == LM3532_ALS_CTRL) { 357 if (brt_val > LED_OFF) 358 ret = lm3532_led_enable(led); 359 else 360 ret = lm3532_led_disable(led); 361 362 goto unlock; 363 } 364 365 if (brt_val == LED_OFF) { 366 ret = lm3532_led_disable(led); 367 goto unlock; 368 } 369 370 ret = lm3532_led_enable(led); 371 if (ret) 372 goto unlock; 373 374 brightness_reg = LM3532_REG_ZONE_TRGT_A + led->control_bank * 5 + 375 (led->ctrl_brt_pointer >> 2); 376 377 ret = regmap_write(led->priv->regmap, brightness_reg, brt_val); 378 379unlock: 380 mutex_unlock(&led->priv->lock); 381 return ret; 382} 383 384static int lm3532_init_registers(struct lm3532_led *led) 385{ 386 struct lm3532_data *drvdata = led->priv; 387 unsigned int runtime_ramp_val; 388 unsigned int output_cfg_val = 0; 389 unsigned int output_cfg_shift = 0; 390 unsigned int output_cfg_mask = 0; 391 unsigned int brightness_config_reg; 392 unsigned int brightness_config_val; 393 int fs_current_reg; 394 int fs_current_val; 395 int ret, i; 396 397 if (drvdata->enable_gpio) 398 gpiod_direction_output(drvdata->enable_gpio, 1); 399 400 brightness_config_reg = LM3532_REG_ZONE_CFG_A + led->control_bank * 2; 401 /* 402 * This could be hard coded to the default value but the control 403 * brightness register may have changed during boot. 404 */ 405 ret = regmap_read(drvdata->regmap, brightness_config_reg, 406 &led->ctrl_brt_pointer); 407 if (ret) 408 return ret; 409 410 led->ctrl_brt_pointer &= LM3532_ZONE_MASK; 411 brightness_config_val = led->ctrl_brt_pointer | led->mode; 412 ret = regmap_write(drvdata->regmap, brightness_config_reg, 413 brightness_config_val); 414 if (ret) 415 return ret; 416 417 if (led->full_scale_current) { 418 fs_current_reg = LM3532_REG_CTRL_A_FS_CURR + led->control_bank * 2; 419 fs_current_val = (led->full_scale_current - LM3532_FS_CURR_MIN) / 420 LM3532_FS_CURR_STEP; 421 422 ret = regmap_write(drvdata->regmap, fs_current_reg, 423 fs_current_val); 424 if (ret) 425 return ret; 426 } 427 428 for (i = 0; i < led->num_leds; i++) { 429 output_cfg_shift = led->led_strings[i] * 2; 430 output_cfg_val |= (led->control_bank << output_cfg_shift); 431 output_cfg_mask |= LM3532_OUTPUT_CFG_MASK << output_cfg_shift; 432 } 433 434 ret = regmap_update_bits(drvdata->regmap, LM3532_REG_OUTPUT_CFG, 435 output_cfg_mask, output_cfg_val); 436 if (ret) 437 return ret; 438 439 runtime_ramp_val = drvdata->runtime_ramp_up | 440 (drvdata->runtime_ramp_down << LM3532_RAMP_DOWN_SHIFT); 441 442 return regmap_write(drvdata->regmap, LM3532_REG_RT_RAMP, 443 runtime_ramp_val); 444} 445 446static int lm3532_als_configure(struct lm3532_data *priv, 447 struct lm3532_led *led) 448{ 449 struct lm3532_als_data *als = priv->als_data; 450 u32 als_vmin, als_vmax, als_vstep; 451 int zone_reg = LM3532_REG_ZN_0_HI; 452 int ret; 453 int i; 454 455 als_vmin = als->als_vmin; 456 als_vmax = als->als_vmax; 457 458 als_vstep = (als_vmax - als_vmin) / ((LM3532_ALS_ZB_MAX + 1) * 2); 459 460 for (i = 0; i < LM3532_ALS_ZB_MAX; i++) { 461 als->zones_lo[i] = ((als_vmin + als_vstep + (i * als_vstep)) * 462 LED_FULL) / 1000; 463 als->zones_hi[i] = ((als_vmin + LM3532_ALS_OFFSET_mV + 464 als_vstep + (i * als_vstep)) * LED_FULL) / 1000; 465 466 zone_reg = LM3532_REG_ZN_0_HI + i * 2; 467 ret = regmap_write(priv->regmap, zone_reg, als->zones_lo[i]); 468 if (ret) 469 return ret; 470 471 zone_reg += 1; 472 ret = regmap_write(priv->regmap, zone_reg, als->zones_hi[i]); 473 if (ret) 474 return ret; 475 } 476 477 als->config = (als->als_avrg_time | (LM3532_ENABLE_ALS) | 478 (als->als_input_mode << LM3532_ALS_SEL_SHIFT)); 479 480 return regmap_write(priv->regmap, LM3532_ALS_CONFIG, als->config); 481} 482 483static int lm3532_parse_als(struct lm3532_data *priv) 484{ 485 struct lm3532_als_data *als; 486 int als_avg_time; 487 int als_impedance; 488 int ret; 489 490 als = devm_kzalloc(priv->dev, sizeof(*als), GFP_KERNEL); 491 if (als == NULL) 492 return -ENOMEM; 493 494 ret = device_property_read_u32(&priv->client->dev, "ti,als-vmin", 495 &als->als_vmin); 496 if (ret) 497 als->als_vmin = 0; 498 499 ret = device_property_read_u32(&priv->client->dev, "ti,als-vmax", 500 &als->als_vmax); 501 if (ret) 502 als->als_vmax = LM3532_ALS_WINDOW_mV; 503 504 if (als->als_vmax > LM3532_ALS_WINDOW_mV) { 505 ret = -EINVAL; 506 return ret; 507 } 508 509 ret = device_property_read_u32(&priv->client->dev, "ti,als1-imp-sel", 510 &als_impedance); 511 if (ret) 512 als->als1_imp_sel = 0; 513 else 514 als->als1_imp_sel = lm3532_get_als_imp_index(als_impedance); 515 516 ret = device_property_read_u32(&priv->client->dev, "ti,als2-imp-sel", 517 &als_impedance); 518 if (ret) 519 als->als2_imp_sel = 0; 520 else 521 als->als2_imp_sel = lm3532_get_als_imp_index(als_impedance); 522 523 ret = device_property_read_u32(&priv->client->dev, "ti,als-avrg-time-us", 524 &als_avg_time); 525 if (ret) 526 als->als_avrg_time = 0; 527 else 528 als->als_avrg_time = lm3532_get_als_avg_index(als_avg_time); 529 530 ret = device_property_read_u8(&priv->client->dev, "ti,als-input-mode", 531 &als->als_input_mode); 532 if (ret) 533 als->als_input_mode = 0; 534 535 if (als->als_input_mode > LM3532_BL_MODE_ALS) { 536 ret = -EINVAL; 537 return ret; 538 } 539 540 priv->als_data = als; 541 542 return ret; 543} 544 545static int lm3532_parse_node(struct lm3532_data *priv) 546{ 547 struct fwnode_handle *child = NULL; 548 struct lm3532_led *led; 549 int control_bank; 550 u32 ramp_time; 551 size_t i = 0; 552 int ret; 553 554 priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev, 555 "enable", GPIOD_OUT_LOW); 556 if (IS_ERR(priv->enable_gpio)) 557 priv->enable_gpio = NULL; 558 559 priv->regulator = devm_regulator_get(&priv->client->dev, "vin"); 560 if (IS_ERR(priv->regulator)) 561 priv->regulator = NULL; 562 563 ret = device_property_read_u32(&priv->client->dev, "ramp-up-us", 564 &ramp_time); 565 if (ret) 566 dev_info(&priv->client->dev, "ramp-up-ms property missing\n"); 567 else 568 priv->runtime_ramp_up = lm3532_get_ramp_index(ramp_time); 569 570 ret = device_property_read_u32(&priv->client->dev, "ramp-down-us", 571 &ramp_time); 572 if (ret) 573 dev_info(&priv->client->dev, "ramp-down-ms property missing\n"); 574 else 575 priv->runtime_ramp_down = lm3532_get_ramp_index(ramp_time); 576 577 device_for_each_child_node(priv->dev, child) { 578 struct led_init_data idata = { 579 .fwnode = child, 580 .default_label = ":", 581 .devicename = priv->client->name, 582 }; 583 584 led = &priv->leds[i]; 585 586 ret = fwnode_property_read_u32(child, "reg", &control_bank); 587 if (ret) { 588 dev_err(&priv->client->dev, "reg property missing\n"); 589 goto child_out; 590 } 591 592 if (control_bank > LM3532_CONTROL_C) { 593 dev_err(&priv->client->dev, "Control bank invalid\n"); 594 continue; 595 } 596 597 led->control_bank = control_bank; 598 599 ret = fwnode_property_read_u32(child, "ti,led-mode", 600 &led->mode); 601 if (ret) { 602 dev_err(&priv->client->dev, "ti,led-mode property missing\n"); 603 goto child_out; 604 } 605 606 if (fwnode_property_present(child, "led-max-microamp") && 607 fwnode_property_read_u32(child, "led-max-microamp", 608 &led->full_scale_current)) 609 dev_err(&priv->client->dev, 610 "Failed getting led-max-microamp\n"); 611 else 612 led->full_scale_current = min(led->full_scale_current, 613 LM3532_FS_CURR_MAX); 614 615 if (led->mode == LM3532_BL_MODE_ALS) { 616 led->mode = LM3532_ALS_CTRL; 617 ret = lm3532_parse_als(priv); 618 if (ret) 619 dev_err(&priv->client->dev, "Failed to parse als\n"); 620 else 621 lm3532_als_configure(priv, led); 622 } else { 623 led->mode = LM3532_I2C_CTRL; 624 } 625 626 led->num_leds = fwnode_property_count_u32(child, "led-sources"); 627 if (led->num_leds > LM3532_MAX_LED_STRINGS) { 628 dev_err(&priv->client->dev, "Too many LED string defined\n"); 629 continue; 630 } 631 632 ret = fwnode_property_read_u32_array(child, "led-sources", 633 led->led_strings, 634 led->num_leds); 635 if (ret) { 636 dev_err(&priv->client->dev, "led-sources property missing\n"); 637 goto child_out; 638 } 639 640 led->priv = priv; 641 led->led_dev.brightness_set_blocking = lm3532_brightness_set; 642 643 ret = devm_led_classdev_register_ext(priv->dev, &led->led_dev, &idata); 644 if (ret) { 645 dev_err(&priv->client->dev, "led register err: %d\n", 646 ret); 647 goto child_out; 648 } 649 650 ret = lm3532_init_registers(led); 651 if (ret) { 652 dev_err(&priv->client->dev, "register init err: %d\n", 653 ret); 654 goto child_out; 655 } 656 657 i++; 658 } 659 return 0; 660 661child_out: 662 fwnode_handle_put(child); 663 return ret; 664} 665 666static int lm3532_probe(struct i2c_client *client, 667 const struct i2c_device_id *id) 668{ 669 struct lm3532_data *drvdata; 670 int ret = 0; 671 int count; 672 673 count = device_get_child_node_count(&client->dev); 674 if (!count) { 675 dev_err(&client->dev, "LEDs are not defined in device tree!"); 676 return -ENODEV; 677 } 678 679 drvdata = devm_kzalloc(&client->dev, struct_size(drvdata, leds, count), 680 GFP_KERNEL); 681 if (drvdata == NULL) 682 return -ENOMEM; 683 684 drvdata->client = client; 685 drvdata->dev = &client->dev; 686 687 drvdata->regmap = devm_regmap_init_i2c(client, &lm3532_regmap_config); 688 if (IS_ERR(drvdata->regmap)) { 689 ret = PTR_ERR(drvdata->regmap); 690 dev_err(&client->dev, "Failed to allocate register map: %d\n", 691 ret); 692 return ret; 693 } 694 695 mutex_init(&drvdata->lock); 696 i2c_set_clientdata(client, drvdata); 697 698 ret = lm3532_parse_node(drvdata); 699 if (ret) { 700 dev_err(&client->dev, "Failed to parse node\n"); 701 return ret; 702 } 703 704 return ret; 705} 706 707static int lm3532_remove(struct i2c_client *client) 708{ 709 struct lm3532_data *drvdata = i2c_get_clientdata(client); 710 711 mutex_destroy(&drvdata->lock); 712 713 if (drvdata->enable_gpio) 714 gpiod_direction_output(drvdata->enable_gpio, 0); 715 716 return 0; 717} 718 719static const struct of_device_id of_lm3532_leds_match[] = { 720 { .compatible = "ti,lm3532", }, 721 {}, 722}; 723MODULE_DEVICE_TABLE(of, of_lm3532_leds_match); 724 725static const struct i2c_device_id lm3532_id[] = { 726 {LM3532_NAME, 0}, 727 {} 728}; 729MODULE_DEVICE_TABLE(i2c, lm3532_id); 730 731static struct i2c_driver lm3532_i2c_driver = { 732 .probe = lm3532_probe, 733 .remove = lm3532_remove, 734 .id_table = lm3532_id, 735 .driver = { 736 .name = LM3532_NAME, 737 .of_match_table = of_lm3532_leds_match, 738 }, 739}; 740module_i2c_driver(lm3532_i2c_driver); 741 742MODULE_DESCRIPTION("Back Light driver for LM3532"); 743MODULE_LICENSE("GPL v2"); 744MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");