1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * lp5523.c - LP5523, LP55231 LED Driver 4 * 5 * Copyright (C) 2010 Nokia Corporation 6 * Copyright (C) 2012 Texas Instruments 7 * 8 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> 9 * Milo(Woogyom) Kim <milo.kim@ti.com> 10 */ 11 12#include <linux/delay.h> 13#include <linux/firmware.h> 14#include <linux/i2c.h> 15#include <linux/leds.h> 16#include <linux/module.h> 17#include <linux/mutex.h> 18#include <linux/of.h> 19#include <linux/platform_data/leds-lp55xx.h> 20#include <linux/slab.h> 21 22#include "leds-lp55xx-common.h" 23 24#define LP5523_PROGRAM_LENGTH 32 /* bytes */ 25/* Memory is used like this: 26 * 0x00 engine 1 program 27 * 0x10 engine 2 program 28 * 0x20 engine 3 program 29 * 0x30 engine 1 muxing info 30 * 0x40 engine 2 muxing info 31 * 0x50 engine 3 muxing info 32 */ 33#define LP5523_MAX_LEDS 9 34 35/* Registers */ 36#define LP5523_REG_ENABLE 0x00 37#define LP5523_REG_OP_MODE 0x01 38#define LP5523_REG_ENABLE_LEDS_MSB 0x04 39#define LP5523_REG_ENABLE_LEDS_LSB 0x05 40#define LP5523_REG_LED_CTRL_BASE 0x06 41#define LP5523_REG_LED_PWM_BASE 0x16 42#define LP5523_REG_LED_CURRENT_BASE 0x26 43#define LP5523_REG_CONFIG 0x36 44#define LP5523_REG_STATUS 0x3A 45#define LP5523_REG_RESET 0x3D 46#define LP5523_REG_LED_TEST_CTRL 0x41 47#define LP5523_REG_LED_TEST_ADC 0x42 48#define LP5523_REG_MASTER_FADER_BASE 0x48 49#define LP5523_REG_CH1_PROG_START 0x4C 50#define LP5523_REG_CH2_PROG_START 0x4D 51#define LP5523_REG_CH3_PROG_START 0x4E 52#define LP5523_REG_PROG_PAGE_SEL 0x4F 53#define LP5523_REG_PROG_MEM 0x50 54 55/* Bit description in registers */ 56#define LP5523_ENABLE 0x40 57#define LP5523_AUTO_INC 0x40 58#define LP5523_PWR_SAVE 0x20 59#define LP5523_PWM_PWR_SAVE 0x04 60#define LP5523_CP_MODE_MASK 0x18 61#define LP5523_CP_MODE_SHIFT 3 62#define LP5523_AUTO_CLK 0x02 63#define LP5523_DEFAULT_CONFIG \ 64 (LP5523_AUTO_INC | LP5523_PWR_SAVE | LP5523_AUTO_CLK | LP5523_PWM_PWR_SAVE) 65 66#define LP5523_EN_LEDTEST 0x80 67#define LP5523_LEDTEST_DONE 0x80 68#define LP5523_RESET 0xFF 69#define LP5523_ADC_SHORTCIRC_LIM 80 70#define LP5523_EXT_CLK_USED 0x08 71#define LP5523_ENG_STATUS_MASK 0x07 72 73#define LP5523_FADER_MAPPING_MASK 0xC0 74#define LP5523_FADER_MAPPING_SHIFT 6 75 76/* Memory Page Selection */ 77#define LP5523_PAGE_ENG1 0 78#define LP5523_PAGE_ENG2 1 79#define LP5523_PAGE_ENG3 2 80#define LP5523_PAGE_MUX1 3 81#define LP5523_PAGE_MUX2 4 82#define LP5523_PAGE_MUX3 5 83 84/* Program Memory Operations */ 85#define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */ 86#define LP5523_MODE_ENG2_M 0x0C 87#define LP5523_MODE_ENG3_M 0x03 88#define LP5523_LOAD_ENG1 0x10 89#define LP5523_LOAD_ENG2 0x04 90#define LP5523_LOAD_ENG3 0x01 91 92#define LP5523_ENG1_IS_LOADING(mode) \ 93 ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1) 94#define LP5523_ENG2_IS_LOADING(mode) \ 95 ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2) 96#define LP5523_ENG3_IS_LOADING(mode) \ 97 ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3) 98 99#define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */ 100#define LP5523_EXEC_ENG2_M 0x0C 101#define LP5523_EXEC_ENG3_M 0x03 102#define LP5523_EXEC_M 0x3F 103#define LP5523_RUN_ENG1 0x20 104#define LP5523_RUN_ENG2 0x08 105#define LP5523_RUN_ENG3 0x02 106 107#define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) 108 109enum lp5523_chip_id { 110 LP5523, 111 LP55231, 112}; 113 114static int lp5523_init_program_engine(struct lp55xx_chip *chip); 115 116static inline void lp5523_wait_opmode_done(void) 117{ 118 usleep_range(1000, 2000); 119} 120 121static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current) 122{ 123 led->led_current = led_current; 124 lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 125 led_current); 126} 127 128static int lp5523_post_init_device(struct lp55xx_chip *chip) 129{ 130 int ret; 131 int val; 132 133 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE); 134 if (ret) 135 return ret; 136 137 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 138 usleep_range(1000, 2000); 139 140 val = LP5523_DEFAULT_CONFIG; 141 val |= (chip->pdata->charge_pump_mode << LP5523_CP_MODE_SHIFT) & LP5523_CP_MODE_MASK; 142 143 ret = lp55xx_write(chip, LP5523_REG_CONFIG, val); 144 if (ret) 145 return ret; 146 147 /* turn on all leds */ 148 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 149 if (ret) 150 return ret; 151 152 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 153 if (ret) 154 return ret; 155 156 return lp5523_init_program_engine(chip); 157} 158 159static void lp5523_load_engine(struct lp55xx_chip *chip) 160{ 161 enum lp55xx_engine_index idx = chip->engine_idx; 162 static const u8 mask[] = { 163 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 164 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 165 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 166 }; 167 168 static const u8 val[] = { 169 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1, 170 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2, 171 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3, 172 }; 173 174 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]); 175 176 lp5523_wait_opmode_done(); 177} 178 179static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip) 180{ 181 enum lp55xx_engine_index idx = chip->engine_idx; 182 static const u8 page_sel[] = { 183 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1, 184 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2, 185 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3, 186 }; 187 188 lp5523_load_engine(chip); 189 190 lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]); 191} 192 193static void lp5523_stop_all_engines(struct lp55xx_chip *chip) 194{ 195 lp55xx_write(chip, LP5523_REG_OP_MODE, 0); 196 lp5523_wait_opmode_done(); 197} 198 199static void lp5523_stop_engine(struct lp55xx_chip *chip) 200{ 201 enum lp55xx_engine_index idx = chip->engine_idx; 202 static const u8 mask[] = { 203 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 204 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 205 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 206 }; 207 208 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0); 209 210 lp5523_wait_opmode_done(); 211} 212 213static void lp5523_turn_off_channels(struct lp55xx_chip *chip) 214{ 215 int i; 216 217 for (i = 0; i < LP5523_MAX_LEDS; i++) 218 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0); 219} 220 221static void lp5523_run_engine(struct lp55xx_chip *chip, bool start) 222{ 223 int ret; 224 u8 mode; 225 u8 exec; 226 227 /* stop engine */ 228 if (!start) { 229 lp5523_stop_engine(chip); 230 lp5523_turn_off_channels(chip); 231 return; 232 } 233 234 /* 235 * To run the engine, 236 * operation mode and enable register should updated at the same time 237 */ 238 239 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode); 240 if (ret) 241 return; 242 243 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec); 244 if (ret) 245 return; 246 247 /* change operation mode to RUN only when each engine is loading */ 248 if (LP5523_ENG1_IS_LOADING(mode)) { 249 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1; 250 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1; 251 } 252 253 if (LP5523_ENG2_IS_LOADING(mode)) { 254 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2; 255 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2; 256 } 257 258 if (LP5523_ENG3_IS_LOADING(mode)) { 259 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3; 260 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3; 261 } 262 263 lp55xx_write(chip, LP5523_REG_OP_MODE, mode); 264 lp5523_wait_opmode_done(); 265 266 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec); 267} 268 269static int lp5523_init_program_engine(struct lp55xx_chip *chip) 270{ 271 int i; 272 int j; 273 int ret; 274 u8 status; 275 /* one pattern per engine setting LED MUX start and stop addresses */ 276 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { 277 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 278 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 279 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 280 }; 281 282 /* hardcode 32 bytes of memory for each engine from program memory */ 283 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00); 284 if (ret) 285 return ret; 286 287 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10); 288 if (ret) 289 return ret; 290 291 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20); 292 if (ret) 293 return ret; 294 295 /* write LED MUX address space for each engine */ 296 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 297 chip->engine_idx = i; 298 lp5523_load_engine_and_select_page(chip); 299 300 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) { 301 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j, 302 pattern[i - 1][j]); 303 if (ret) 304 goto out; 305 } 306 } 307 308 lp5523_run_engine(chip, true); 309 310 /* Let the programs run for couple of ms and check the engine status */ 311 usleep_range(3000, 6000); 312 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 313 if (ret) 314 goto out; 315 status &= LP5523_ENG_STATUS_MASK; 316 317 if (status != LP5523_ENG_STATUS_MASK) { 318 dev_err(&chip->cl->dev, 319 "could not configure LED engine, status = 0x%.2x\n", 320 status); 321 ret = -1; 322 } 323 324out: 325 lp5523_stop_all_engines(chip); 326 return ret; 327} 328 329static int lp5523_update_program_memory(struct lp55xx_chip *chip, 330 const u8 *data, size_t size) 331{ 332 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 333 unsigned int cmd; 334 char c[3]; 335 int nrchars; 336 int ret; 337 int offset = 0; 338 int i = 0; 339 340 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) { 341 /* separate sscanfs because length is working only for %s */ 342 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 343 if (ret != 1) 344 goto err; 345 346 ret = sscanf(c, "%2x", &cmd); 347 if (ret != 1) 348 goto err; 349 350 pattern[i] = (u8)cmd; 351 offset += nrchars; 352 i++; 353 } 354 355 /* Each instruction is 16bit long. Check that length is even */ 356 if (i % 2) 357 goto err; 358 359 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { 360 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); 361 if (ret) 362 return -EINVAL; 363 } 364 365 return size; 366 367err: 368 dev_err(&chip->cl->dev, "wrong pattern format\n"); 369 return -EINVAL; 370} 371 372static void lp5523_firmware_loaded(struct lp55xx_chip *chip) 373{ 374 const struct firmware *fw = chip->fw; 375 376 if (fw->size > LP5523_PROGRAM_LENGTH) { 377 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 378 fw->size); 379 return; 380 } 381 382 /* 383 * Program memory sequence 384 * 1) set engine mode to "LOAD" 385 * 2) write firmware data into program memory 386 */ 387 388 lp5523_load_engine_and_select_page(chip); 389 lp5523_update_program_memory(chip, fw->data, fw->size); 390} 391 392static ssize_t show_engine_mode(struct device *dev, 393 struct device_attribute *attr, 394 char *buf, int nr) 395{ 396 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 397 struct lp55xx_chip *chip = led->chip; 398 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; 399 400 switch (mode) { 401 case LP55XX_ENGINE_RUN: 402 return sprintf(buf, "run\n"); 403 case LP55XX_ENGINE_LOAD: 404 return sprintf(buf, "load\n"); 405 case LP55XX_ENGINE_DISABLED: 406 default: 407 return sprintf(buf, "disabled\n"); 408 } 409} 410show_mode(1) 411show_mode(2) 412show_mode(3) 413 414static ssize_t store_engine_mode(struct device *dev, 415 struct device_attribute *attr, 416 const char *buf, size_t len, int nr) 417{ 418 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 419 struct lp55xx_chip *chip = led->chip; 420 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 421 422 mutex_lock(&chip->lock); 423 424 chip->engine_idx = nr; 425 426 if (!strncmp(buf, "run", 3)) { 427 lp5523_run_engine(chip, true); 428 engine->mode = LP55XX_ENGINE_RUN; 429 } else if (!strncmp(buf, "load", 4)) { 430 lp5523_stop_engine(chip); 431 lp5523_load_engine(chip); 432 engine->mode = LP55XX_ENGINE_LOAD; 433 } else if (!strncmp(buf, "disabled", 8)) { 434 lp5523_stop_engine(chip); 435 engine->mode = LP55XX_ENGINE_DISABLED; 436 } 437 438 mutex_unlock(&chip->lock); 439 440 return len; 441} 442store_mode(1) 443store_mode(2) 444store_mode(3) 445 446static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 447{ 448 u16 tmp_mux = 0; 449 int i; 450 451 len = min_t(int, len, LP5523_MAX_LEDS); 452 453 for (i = 0; i < len; i++) { 454 switch (buf[i]) { 455 case '1': 456 tmp_mux |= (1 << i); 457 break; 458 case '0': 459 break; 460 case '\n': 461 i = len; 462 break; 463 default: 464 return -1; 465 } 466 } 467 *mux = tmp_mux; 468 469 return 0; 470} 471 472static void lp5523_mux_to_array(u16 led_mux, char *array) 473{ 474 int i, pos = 0; 475 476 for (i = 0; i < LP5523_MAX_LEDS; i++) 477 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 478 479 array[pos] = '\0'; 480} 481 482static ssize_t show_engine_leds(struct device *dev, 483 struct device_attribute *attr, 484 char *buf, int nr) 485{ 486 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 487 struct lp55xx_chip *chip = led->chip; 488 char mux[LP5523_MAX_LEDS + 1]; 489 490 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 491 492 return sprintf(buf, "%s\n", mux); 493} 494show_leds(1) 495show_leds(2) 496show_leds(3) 497 498static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 499{ 500 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 501 int ret; 502 static const u8 mux_page[] = { 503 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 504 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 505 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 506 }; 507 508 lp5523_load_engine(chip); 509 510 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 511 if (ret) 512 return ret; 513 514 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM, (u8)(mux >> 8)); 515 if (ret) 516 return ret; 517 518 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 519 if (ret) 520 return ret; 521 522 engine->led_mux = mux; 523 return 0; 524} 525 526static ssize_t store_engine_leds(struct device *dev, 527 struct device_attribute *attr, 528 const char *buf, size_t len, int nr) 529{ 530 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 531 struct lp55xx_chip *chip = led->chip; 532 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 533 u16 mux = 0; 534 ssize_t ret; 535 536 if (lp5523_mux_parse(buf, &mux, len)) 537 return -EINVAL; 538 539 mutex_lock(&chip->lock); 540 541 chip->engine_idx = nr; 542 ret = -EINVAL; 543 544 if (engine->mode != LP55XX_ENGINE_LOAD) 545 goto leave; 546 547 if (lp5523_load_mux(chip, mux, nr)) 548 goto leave; 549 550 ret = len; 551leave: 552 mutex_unlock(&chip->lock); 553 return ret; 554} 555store_leds(1) 556store_leds(2) 557store_leds(3) 558 559static ssize_t store_engine_load(struct device *dev, 560 struct device_attribute *attr, 561 const char *buf, size_t len, int nr) 562{ 563 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 564 struct lp55xx_chip *chip = led->chip; 565 int ret; 566 567 mutex_lock(&chip->lock); 568 569 chip->engine_idx = nr; 570 lp5523_load_engine_and_select_page(chip); 571 ret = lp5523_update_program_memory(chip, buf, len); 572 573 mutex_unlock(&chip->lock); 574 575 return ret; 576} 577store_load(1) 578store_load(2) 579store_load(3) 580 581static ssize_t lp5523_selftest(struct device *dev, 582 struct device_attribute *attr, 583 char *buf) 584{ 585 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 586 struct lp55xx_chip *chip = led->chip; 587 struct lp55xx_platform_data *pdata = chip->pdata; 588 int ret, pos = 0; 589 u8 status, adc, vdd, i; 590 591 mutex_lock(&chip->lock); 592 593 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 594 if (ret < 0) 595 goto fail; 596 597 /* Check that ext clock is really in use if requested */ 598 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 599 if ((status & LP5523_EXT_CLK_USED) == 0) 600 goto fail; 601 } 602 603 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 604 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 605 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 606 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 607 if (ret < 0) 608 goto fail; 609 610 if (!(status & LP5523_LEDTEST_DONE)) 611 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 612 613 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 614 if (ret < 0) 615 goto fail; 616 617 vdd--; /* There may be some fluctuation in measurement */ 618 619 for (i = 0; i < pdata->num_channels; i++) { 620 /* Skip disabled channels */ 621 if (pdata->led_config[i].led_current == 0) 622 continue; 623 624 /* Set default current */ 625 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 626 pdata->led_config[i].led_current); 627 628 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 629 0xff); 630 /* let current stabilize 2 - 4ms before measurements start */ 631 usleep_range(2000, 4000); 632 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, 633 LP5523_EN_LEDTEST | led->chan_nr); 634 /* ADC conversion time is 2.7 ms typically */ 635 usleep_range(3000, 6000); 636 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 637 if (ret < 0) 638 goto fail; 639 640 if (!(status & LP5523_LEDTEST_DONE)) 641 usleep_range(3000, 6000); /* Was not ready. Wait. */ 642 643 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc); 644 if (ret < 0) 645 goto fail; 646 647 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 648 pos += sprintf(buf + pos, "LED %d FAIL\n", 649 led->chan_nr); 650 651 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 652 0x00); 653 654 /* Restore current */ 655 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 656 led->led_current); 657 led++; 658 } 659 if (pos == 0) 660 pos = sprintf(buf, "OK\n"); 661 goto release_lock; 662fail: 663 pos = sprintf(buf, "FAIL\n"); 664 665release_lock: 666 mutex_unlock(&chip->lock); 667 668 return pos; 669} 670 671#define show_fader(nr) \ 672static ssize_t show_master_fader##nr(struct device *dev, \ 673 struct device_attribute *attr, \ 674 char *buf) \ 675{ \ 676 return show_master_fader(dev, attr, buf, nr); \ 677} 678 679#define store_fader(nr) \ 680static ssize_t store_master_fader##nr(struct device *dev, \ 681 struct device_attribute *attr, \ 682 const char *buf, size_t len) \ 683{ \ 684 return store_master_fader(dev, attr, buf, len, nr); \ 685} 686 687static ssize_t show_master_fader(struct device *dev, 688 struct device_attribute *attr, 689 char *buf, int nr) 690{ 691 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 692 struct lp55xx_chip *chip = led->chip; 693 int ret; 694 u8 val; 695 696 mutex_lock(&chip->lock); 697 ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val); 698 mutex_unlock(&chip->lock); 699 700 if (ret == 0) 701 ret = sprintf(buf, "%u\n", val); 702 703 return ret; 704} 705show_fader(1) 706show_fader(2) 707show_fader(3) 708 709static ssize_t store_master_fader(struct device *dev, 710 struct device_attribute *attr, 711 const char *buf, size_t len, int nr) 712{ 713 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 714 struct lp55xx_chip *chip = led->chip; 715 int ret; 716 unsigned long val; 717 718 if (kstrtoul(buf, 0, &val)) 719 return -EINVAL; 720 721 if (val > 0xff) 722 return -EINVAL; 723 724 mutex_lock(&chip->lock); 725 ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, 726 (u8)val); 727 mutex_unlock(&chip->lock); 728 729 if (ret == 0) 730 ret = len; 731 732 return ret; 733} 734store_fader(1) 735store_fader(2) 736store_fader(3) 737 738static ssize_t show_master_fader_leds(struct device *dev, 739 struct device_attribute *attr, 740 char *buf) 741{ 742 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 743 struct lp55xx_chip *chip = led->chip; 744 int i, ret, pos = 0; 745 u8 val; 746 747 mutex_lock(&chip->lock); 748 749 for (i = 0; i < LP5523_MAX_LEDS; i++) { 750 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val); 751 if (ret) 752 goto leave; 753 754 val = (val & LP5523_FADER_MAPPING_MASK) 755 >> LP5523_FADER_MAPPING_SHIFT; 756 if (val > 3) { 757 ret = -EINVAL; 758 goto leave; 759 } 760 buf[pos++] = val + '0'; 761 } 762 buf[pos++] = '\n'; 763 ret = pos; 764leave: 765 mutex_unlock(&chip->lock); 766 return ret; 767} 768 769static ssize_t store_master_fader_leds(struct device *dev, 770 struct device_attribute *attr, 771 const char *buf, size_t len) 772{ 773 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 774 struct lp55xx_chip *chip = led->chip; 775 int i, n, ret; 776 u8 val; 777 778 n = min_t(int, len, LP5523_MAX_LEDS); 779 780 mutex_lock(&chip->lock); 781 782 for (i = 0; i < n; i++) { 783 if (buf[i] >= '0' && buf[i] <= '3') { 784 val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT; 785 ret = lp55xx_update_bits(chip, 786 LP5523_REG_LED_CTRL_BASE + i, 787 LP5523_FADER_MAPPING_MASK, 788 val); 789 if (ret) 790 goto leave; 791 } else { 792 ret = -EINVAL; 793 goto leave; 794 } 795 } 796 ret = len; 797leave: 798 mutex_unlock(&chip->lock); 799 return ret; 800} 801 802static int lp5523_multicolor_brightness(struct lp55xx_led *led) 803{ 804 struct lp55xx_chip *chip = led->chip; 805 int ret; 806 int i; 807 808 mutex_lock(&chip->lock); 809 for (i = 0; i < led->mc_cdev.num_colors; i++) { 810 ret = lp55xx_write(chip, 811 LP5523_REG_LED_PWM_BASE + 812 led->mc_cdev.subled_info[i].channel, 813 led->mc_cdev.subled_info[i].brightness); 814 if (ret) 815 break; 816 } 817 mutex_unlock(&chip->lock); 818 return ret; 819} 820 821static int lp5523_led_brightness(struct lp55xx_led *led) 822{ 823 struct lp55xx_chip *chip = led->chip; 824 int ret; 825 826 mutex_lock(&chip->lock); 827 ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 828 led->brightness); 829 mutex_unlock(&chip->lock); 830 return ret; 831} 832 833static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 834static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 835static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 836static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 837static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 838static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 839static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 840static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 841static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 842static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 843static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1, 844 store_master_fader1); 845static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2, 846 store_master_fader2); 847static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3, 848 store_master_fader3); 849static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds, 850 store_master_fader_leds); 851 852static struct attribute *lp5523_attributes[] = { 853 &dev_attr_engine1_mode.attr, 854 &dev_attr_engine2_mode.attr, 855 &dev_attr_engine3_mode.attr, 856 &dev_attr_engine1_load.attr, 857 &dev_attr_engine2_load.attr, 858 &dev_attr_engine3_load.attr, 859 &dev_attr_engine1_leds.attr, 860 &dev_attr_engine2_leds.attr, 861 &dev_attr_engine3_leds.attr, 862 &dev_attr_selftest.attr, 863 &dev_attr_master_fader1.attr, 864 &dev_attr_master_fader2.attr, 865 &dev_attr_master_fader3.attr, 866 &dev_attr_master_fader_leds.attr, 867 NULL, 868}; 869 870static const struct attribute_group lp5523_group = { 871 .attrs = lp5523_attributes, 872}; 873 874/* Chip specific configurations */ 875static struct lp55xx_device_config lp5523_cfg = { 876 .reset = { 877 .addr = LP5523_REG_RESET, 878 .val = LP5523_RESET, 879 }, 880 .enable = { 881 .addr = LP5523_REG_ENABLE, 882 .val = LP5523_ENABLE, 883 }, 884 .max_channel = LP5523_MAX_LEDS, 885 .post_init_device = lp5523_post_init_device, 886 .brightness_fn = lp5523_led_brightness, 887 .multicolor_brightness_fn = lp5523_multicolor_brightness, 888 .set_led_current = lp5523_set_led_current, 889 .firmware_cb = lp5523_firmware_loaded, 890 .run_engine = lp5523_run_engine, 891 .dev_attr_group = &lp5523_group, 892}; 893 894static int lp5523_probe(struct i2c_client *client) 895{ 896 const struct i2c_device_id *id = i2c_client_get_device_id(client); 897 int ret; 898 struct lp55xx_chip *chip; 899 struct lp55xx_led *led; 900 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev); 901 struct device_node *np = dev_of_node(&client->dev); 902 903 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 904 if (!chip) 905 return -ENOMEM; 906 907 chip->cfg = &lp5523_cfg; 908 909 if (!pdata) { 910 if (np) { 911 pdata = lp55xx_of_populate_pdata(&client->dev, np, 912 chip); 913 if (IS_ERR(pdata)) 914 return PTR_ERR(pdata); 915 } else { 916 dev_err(&client->dev, "no platform data\n"); 917 return -EINVAL; 918 } 919 } 920 921 led = devm_kcalloc(&client->dev, 922 pdata->num_channels, sizeof(*led), GFP_KERNEL); 923 if (!led) 924 return -ENOMEM; 925 926 chip->cl = client; 927 chip->pdata = pdata; 928 929 mutex_init(&chip->lock); 930 931 i2c_set_clientdata(client, led); 932 933 ret = lp55xx_init_device(chip); 934 if (ret) 935 goto err_init; 936 937 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 938 939 ret = lp55xx_register_leds(led, chip); 940 if (ret) 941 goto err_out; 942 943 ret = lp55xx_register_sysfs(chip); 944 if (ret) { 945 dev_err(&client->dev, "registering sysfs failed\n"); 946 goto err_out; 947 } 948 949 return 0; 950 951err_out: 952 lp55xx_deinit_device(chip); 953err_init: 954 return ret; 955} 956 957static void lp5523_remove(struct i2c_client *client) 958{ 959 struct lp55xx_led *led = i2c_get_clientdata(client); 960 struct lp55xx_chip *chip = led->chip; 961 962 lp5523_stop_all_engines(chip); 963 lp55xx_unregister_sysfs(chip); 964 lp55xx_deinit_device(chip); 965} 966 967static const struct i2c_device_id lp5523_id[] = { 968 { "lp5523", LP5523 }, 969 { "lp55231", LP55231 }, 970 { } 971}; 972 973MODULE_DEVICE_TABLE(i2c, lp5523_id); 974 975static const struct of_device_id of_lp5523_leds_match[] = { 976 { .compatible = "national,lp5523", }, 977 { .compatible = "ti,lp55231", }, 978 {}, 979}; 980 981MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 982 983static struct i2c_driver lp5523_driver = { 984 .driver = { 985 .name = "lp5523x", 986 .of_match_table = of_lp5523_leds_match, 987 }, 988 .probe = lp5523_probe, 989 .remove = lp5523_remove, 990 .id_table = lp5523_id, 991}; 992 993module_i2c_driver(lp5523_driver); 994 995MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 996MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 997MODULE_DESCRIPTION("LP5523 LED engine"); 998MODULE_LICENSE("GPL"); 999