1 /* 2 * lp5523.c - LP5523 LED Driver 3 * 4 * Copyright (C) 2010 Nokia Corporation 5 * Copyright (C) 2012 Texas Instruments 6 * 7 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> 8 * Milo(Woogyom) Kim <milo.kim@ti.com> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * version 2 as published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 22 * 02110-1301 USA 23 */ 24 25 #include <linux/delay.h> 26 #include <linux/firmware.h> 27 #include <linux/i2c.h> 28 #include <linux/init.h> 29 #include <linux/leds.h> 30 #include <linux/module.h> 31 #include <linux/mutex.h> 32 #include <linux/platform_data/leds-lp55xx.h> 33 #include <linux/slab.h> 34 35 #include "leds-lp55xx-common.h" 36 37 #define LP5523_PROGRAM_LENGTH 32 38 #define LP5523_MAX_LEDS 9 39 40 /* Registers */ 41 #define LP5523_REG_ENABLE 0x00 42 #define LP5523_REG_OP_MODE 0x01 43 #define LP5523_REG_ENABLE_LEDS_MSB 0x04 44 #define LP5523_REG_ENABLE_LEDS_LSB 0x05 45 #define LP5523_REG_LED_PWM_BASE 0x16 46 #define LP5523_REG_LED_CURRENT_BASE 0x26 47 #define LP5523_REG_CONFIG 0x36 48 #define LP5523_REG_STATUS 0x3A 49 #define LP5523_REG_RESET 0x3D 50 #define LP5523_REG_LED_TEST_CTRL 0x41 51 #define LP5523_REG_LED_TEST_ADC 0x42 52 #define LP5523_REG_CH1_PROG_START 0x4C 53 #define LP5523_REG_CH2_PROG_START 0x4D 54 #define LP5523_REG_CH3_PROG_START 0x4E 55 #define LP5523_REG_PROG_PAGE_SEL 0x4F 56 #define LP5523_REG_PROG_MEM 0x50 57 58 /* Bit description in registers */ 59 #define LP5523_ENABLE 0x40 60 #define LP5523_AUTO_INC 0x40 61 #define LP5523_PWR_SAVE 0x20 62 #define LP5523_PWM_PWR_SAVE 0x04 63 #define LP5523_CP_AUTO 0x18 64 #define LP5523_AUTO_CLK 0x02 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 /* Memory Page Selection */ 74 #define LP5523_PAGE_ENG1 0 75 #define LP5523_PAGE_ENG2 1 76 #define LP5523_PAGE_ENG3 2 77 #define LP5523_PAGE_MUX1 3 78 #define LP5523_PAGE_MUX2 4 79 #define LP5523_PAGE_MUX3 5 80 81 /* Program Memory Operations */ 82 #define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */ 83 #define LP5523_MODE_ENG2_M 0x0C 84 #define LP5523_MODE_ENG3_M 0x03 85 #define LP5523_LOAD_ENG1 0x10 86 #define LP5523_LOAD_ENG2 0x04 87 #define LP5523_LOAD_ENG3 0x01 88 89 #define LP5523_ENG1_IS_LOADING(mode) \ 90 ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1) 91 #define LP5523_ENG2_IS_LOADING(mode) \ 92 ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2) 93 #define LP5523_ENG3_IS_LOADING(mode) \ 94 ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3) 95 96 #define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */ 97 #define LP5523_EXEC_ENG2_M 0x0C 98 #define LP5523_EXEC_ENG3_M 0x03 99 #define LP5523_EXEC_M 0x3F 100 #define LP5523_RUN_ENG1 0x20 101 #define LP5523_RUN_ENG2 0x08 102 #define LP5523_RUN_ENG3 0x02 103 104 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) 105 106 enum lp5523_chip_id { 107 LP5523, 108 LP55231, 109 }; 110 111 static int lp5523_init_program_engine(struct lp55xx_chip *chip); 112 113 static inline void lp5523_wait_opmode_done(void) 114 { 115 usleep_range(1000, 2000); 116 } 117 118 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current) 119 { 120 led->led_current = led_current; 121 lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 122 led_current); 123 } 124 125 static int lp5523_post_init_device(struct lp55xx_chip *chip) 126 { 127 int ret; 128 129 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE); 130 if (ret) 131 return ret; 132 133 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 134 usleep_range(1000, 2000); 135 136 ret = lp55xx_write(chip, LP5523_REG_CONFIG, 137 LP5523_AUTO_INC | LP5523_PWR_SAVE | 138 LP5523_CP_AUTO | LP5523_AUTO_CLK | 139 LP5523_PWM_PWR_SAVE); 140 if (ret) 141 return ret; 142 143 /* turn on all leds */ 144 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 145 if (ret) 146 return ret; 147 148 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 149 if (ret) 150 return ret; 151 152 return lp5523_init_program_engine(chip); 153 } 154 155 static void lp5523_load_engine(struct lp55xx_chip *chip) 156 { 157 enum lp55xx_engine_index idx = chip->engine_idx; 158 u8 mask[] = { 159 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 160 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 161 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 162 }; 163 164 u8 val[] = { 165 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1, 166 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2, 167 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3, 168 }; 169 170 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]); 171 172 lp5523_wait_opmode_done(); 173 } 174 175 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip) 176 { 177 enum lp55xx_engine_index idx = chip->engine_idx; 178 u8 page_sel[] = { 179 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1, 180 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2, 181 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3, 182 }; 183 184 lp5523_load_engine(chip); 185 186 lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]); 187 } 188 189 static void lp5523_stop_engine(struct lp55xx_chip *chip) 190 { 191 lp55xx_write(chip, LP5523_REG_OP_MODE, 0); 192 lp5523_wait_opmode_done(); 193 } 194 195 static void lp5523_turn_off_channels(struct lp55xx_chip *chip) 196 { 197 int i; 198 199 for (i = 0; i < LP5523_MAX_LEDS; i++) 200 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0); 201 } 202 203 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start) 204 { 205 int ret; 206 u8 mode; 207 u8 exec; 208 209 /* stop engine */ 210 if (!start) { 211 lp5523_stop_engine(chip); 212 lp5523_turn_off_channels(chip); 213 return; 214 } 215 216 /* 217 * To run the engine, 218 * operation mode and enable register should updated at the same time 219 */ 220 221 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode); 222 if (ret) 223 return; 224 225 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec); 226 if (ret) 227 return; 228 229 /* change operation mode to RUN only when each engine is loading */ 230 if (LP5523_ENG1_IS_LOADING(mode)) { 231 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1; 232 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1; 233 } 234 235 if (LP5523_ENG2_IS_LOADING(mode)) { 236 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2; 237 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2; 238 } 239 240 if (LP5523_ENG3_IS_LOADING(mode)) { 241 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3; 242 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3; 243 } 244 245 lp55xx_write(chip, LP5523_REG_OP_MODE, mode); 246 lp5523_wait_opmode_done(); 247 248 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec); 249 } 250 251 static int lp5523_init_program_engine(struct lp55xx_chip *chip) 252 { 253 int i; 254 int j; 255 int ret; 256 u8 status; 257 /* one pattern per engine setting LED MUX start and stop addresses */ 258 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { 259 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 260 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 261 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 262 }; 263 264 /* hardcode 32 bytes of memory for each engine from program memory */ 265 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00); 266 if (ret) 267 return ret; 268 269 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10); 270 if (ret) 271 return ret; 272 273 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20); 274 if (ret) 275 return ret; 276 277 /* write LED MUX address space for each engine */ 278 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 279 chip->engine_idx = i; 280 lp5523_load_engine_and_select_page(chip); 281 282 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) { 283 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j, 284 pattern[i - 1][j]); 285 if (ret) 286 goto out; 287 } 288 } 289 290 lp5523_run_engine(chip, true); 291 292 /* Let the programs run for couple of ms and check the engine status */ 293 usleep_range(3000, 6000); 294 lp55xx_read(chip, LP5523_REG_STATUS, &status); 295 status &= LP5523_ENG_STATUS_MASK; 296 297 if (status != LP5523_ENG_STATUS_MASK) { 298 dev_err(&chip->cl->dev, 299 "cound not configure LED engine, status = 0x%.2x\n", 300 status); 301 ret = -1; 302 } 303 304 out: 305 lp5523_stop_engine(chip); 306 return ret; 307 } 308 309 static int lp5523_update_program_memory(struct lp55xx_chip *chip, 310 const u8 *data, size_t size) 311 { 312 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 313 unsigned cmd; 314 char c[3]; 315 int nrchars; 316 int ret; 317 int offset = 0; 318 int i = 0; 319 320 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) { 321 /* separate sscanfs because length is working only for %s */ 322 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 323 if (ret != 1) 324 goto err; 325 326 ret = sscanf(c, "%2x", &cmd); 327 if (ret != 1) 328 goto err; 329 330 pattern[i] = (u8)cmd; 331 offset += nrchars; 332 i++; 333 } 334 335 /* Each instruction is 16bit long. Check that length is even */ 336 if (i % 2) 337 goto err; 338 339 mutex_lock(&chip->lock); 340 341 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { 342 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); 343 if (ret) { 344 mutex_unlock(&chip->lock); 345 return -EINVAL; 346 } 347 } 348 349 mutex_unlock(&chip->lock); 350 351 return size; 352 353 err: 354 dev_err(&chip->cl->dev, "wrong pattern format\n"); 355 return -EINVAL; 356 } 357 358 static void lp5523_firmware_loaded(struct lp55xx_chip *chip) 359 { 360 const struct firmware *fw = chip->fw; 361 362 if (fw->size > LP5523_PROGRAM_LENGTH) { 363 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 364 fw->size); 365 return; 366 } 367 368 /* 369 * Program momery sequence 370 * 1) set engine mode to "LOAD" 371 * 2) write firmware data into program memory 372 */ 373 374 lp5523_load_engine_and_select_page(chip); 375 lp5523_update_program_memory(chip, fw->data, fw->size); 376 } 377 378 static ssize_t show_engine_mode(struct device *dev, 379 struct device_attribute *attr, 380 char *buf, int nr) 381 { 382 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 383 struct lp55xx_chip *chip = led->chip; 384 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; 385 386 switch (mode) { 387 case LP55XX_ENGINE_RUN: 388 return sprintf(buf, "run\n"); 389 case LP55XX_ENGINE_LOAD: 390 return sprintf(buf, "load\n"); 391 case LP55XX_ENGINE_DISABLED: 392 default: 393 return sprintf(buf, "disabled\n"); 394 } 395 } 396 show_mode(1) 397 show_mode(2) 398 show_mode(3) 399 400 static ssize_t store_engine_mode(struct device *dev, 401 struct device_attribute *attr, 402 const char *buf, size_t len, int nr) 403 { 404 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 405 struct lp55xx_chip *chip = led->chip; 406 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 407 408 mutex_lock(&chip->lock); 409 410 chip->engine_idx = nr; 411 412 if (!strncmp(buf, "run", 3)) { 413 lp5523_run_engine(chip, true); 414 engine->mode = LP55XX_ENGINE_RUN; 415 } else if (!strncmp(buf, "load", 4)) { 416 lp5523_stop_engine(chip); 417 lp5523_load_engine(chip); 418 engine->mode = LP55XX_ENGINE_LOAD; 419 } else if (!strncmp(buf, "disabled", 8)) { 420 lp5523_stop_engine(chip); 421 engine->mode = LP55XX_ENGINE_DISABLED; 422 } 423 424 mutex_unlock(&chip->lock); 425 426 return len; 427 } 428 store_mode(1) 429 store_mode(2) 430 store_mode(3) 431 432 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 433 { 434 u16 tmp_mux = 0; 435 int i; 436 437 len = min_t(int, len, LP5523_MAX_LEDS); 438 439 for (i = 0; i < len; i++) { 440 switch (buf[i]) { 441 case '1': 442 tmp_mux |= (1 << i); 443 break; 444 case '0': 445 break; 446 case '\n': 447 i = len; 448 break; 449 default: 450 return -1; 451 } 452 } 453 *mux = tmp_mux; 454 455 return 0; 456 } 457 458 static void lp5523_mux_to_array(u16 led_mux, char *array) 459 { 460 int i, pos = 0; 461 for (i = 0; i < LP5523_MAX_LEDS; i++) 462 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 463 464 array[pos] = '\0'; 465 } 466 467 static ssize_t show_engine_leds(struct device *dev, 468 struct device_attribute *attr, 469 char *buf, int nr) 470 { 471 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 472 struct lp55xx_chip *chip = led->chip; 473 char mux[LP5523_MAX_LEDS + 1]; 474 475 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 476 477 return sprintf(buf, "%s\n", mux); 478 } 479 show_leds(1) 480 show_leds(2) 481 show_leds(3) 482 483 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 484 { 485 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 486 int ret; 487 u8 mux_page[] = { 488 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 489 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 490 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 491 }; 492 493 lp5523_load_engine(chip); 494 495 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 496 if (ret) 497 return ret; 498 499 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8)); 500 if (ret) 501 return ret; 502 503 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 504 if (ret) 505 return ret; 506 507 engine->led_mux = mux; 508 return 0; 509 } 510 511 static ssize_t store_engine_leds(struct device *dev, 512 struct device_attribute *attr, 513 const char *buf, size_t len, int nr) 514 { 515 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 516 struct lp55xx_chip *chip = led->chip; 517 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 518 u16 mux = 0; 519 ssize_t ret; 520 521 if (lp5523_mux_parse(buf, &mux, len)) 522 return -EINVAL; 523 524 mutex_lock(&chip->lock); 525 526 chip->engine_idx = nr; 527 ret = -EINVAL; 528 529 if (engine->mode != LP55XX_ENGINE_LOAD) 530 goto leave; 531 532 if (lp5523_load_mux(chip, mux, nr)) 533 goto leave; 534 535 ret = len; 536 leave: 537 mutex_unlock(&chip->lock); 538 return ret; 539 } 540 store_leds(1) 541 store_leds(2) 542 store_leds(3) 543 544 static ssize_t store_engine_load(struct device *dev, 545 struct device_attribute *attr, 546 const char *buf, size_t len, int nr) 547 { 548 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 549 struct lp55xx_chip *chip = led->chip; 550 551 mutex_lock(&chip->lock); 552 553 chip->engine_idx = nr; 554 lp5523_load_engine_and_select_page(chip); 555 556 mutex_unlock(&chip->lock); 557 558 return lp5523_update_program_memory(chip, buf, len); 559 } 560 store_load(1) 561 store_load(2) 562 store_load(3) 563 564 static ssize_t lp5523_selftest(struct device *dev, 565 struct device_attribute *attr, 566 char *buf) 567 { 568 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 569 struct lp55xx_chip *chip = led->chip; 570 struct lp55xx_platform_data *pdata = chip->pdata; 571 int i, ret, pos = 0; 572 u8 status, adc, vdd; 573 574 mutex_lock(&chip->lock); 575 576 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 577 if (ret < 0) 578 goto fail; 579 580 /* Check that ext clock is really in use if requested */ 581 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 582 if ((status & LP5523_EXT_CLK_USED) == 0) 583 goto fail; 584 } 585 586 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 587 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 588 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 589 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 590 if (ret < 0) 591 goto fail; 592 593 if (!(status & LP5523_LEDTEST_DONE)) 594 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 595 596 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 597 if (ret < 0) 598 goto fail; 599 600 vdd--; /* There may be some fluctuation in measurement */ 601 602 for (i = 0; i < LP5523_MAX_LEDS; i++) { 603 /* Skip non-existing channels */ 604 if (pdata->led_config[i].led_current == 0) 605 continue; 606 607 /* Set default current */ 608 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 609 pdata->led_config[i].led_current); 610 611 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff); 612 /* let current stabilize 2 - 4ms before measurements start */ 613 usleep_range(2000, 4000); 614 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, 615 LP5523_EN_LEDTEST | i); 616 /* ADC conversion time is 2.7 ms typically */ 617 usleep_range(3000, 6000); 618 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 619 if (ret < 0) 620 goto fail; 621 622 if (!(status & LP5523_LEDTEST_DONE)) 623 usleep_range(3000, 6000);/* Was not ready. Wait. */ 624 625 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc); 626 if (ret < 0) 627 goto fail; 628 629 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 630 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 631 632 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00); 633 634 /* Restore current */ 635 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 636 led->led_current); 637 led++; 638 } 639 if (pos == 0) 640 pos = sprintf(buf, "OK\n"); 641 goto release_lock; 642 fail: 643 pos = sprintf(buf, "FAIL\n"); 644 645 release_lock: 646 mutex_unlock(&chip->lock); 647 648 return pos; 649 } 650 651 static void lp5523_led_brightness_work(struct work_struct *work) 652 { 653 struct lp55xx_led *led = container_of(work, struct lp55xx_led, 654 brightness_work); 655 struct lp55xx_chip *chip = led->chip; 656 657 mutex_lock(&chip->lock); 658 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 659 led->brightness); 660 mutex_unlock(&chip->lock); 661 } 662 663 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 664 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 665 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 666 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 667 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 668 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 669 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 670 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 671 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 672 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 673 674 static struct attribute *lp5523_attributes[] = { 675 &dev_attr_engine1_mode.attr, 676 &dev_attr_engine2_mode.attr, 677 &dev_attr_engine3_mode.attr, 678 &dev_attr_engine1_load.attr, 679 &dev_attr_engine2_load.attr, 680 &dev_attr_engine3_load.attr, 681 &dev_attr_engine1_leds.attr, 682 &dev_attr_engine2_leds.attr, 683 &dev_attr_engine3_leds.attr, 684 &dev_attr_selftest.attr, 685 NULL, 686 }; 687 688 static const struct attribute_group lp5523_group = { 689 .attrs = lp5523_attributes, 690 }; 691 692 /* Chip specific configurations */ 693 static struct lp55xx_device_config lp5523_cfg = { 694 .reset = { 695 .addr = LP5523_REG_RESET, 696 .val = LP5523_RESET, 697 }, 698 .enable = { 699 .addr = LP5523_REG_ENABLE, 700 .val = LP5523_ENABLE, 701 }, 702 .max_channel = LP5523_MAX_LEDS, 703 .post_init_device = lp5523_post_init_device, 704 .brightness_work_fn = lp5523_led_brightness_work, 705 .set_led_current = lp5523_set_led_current, 706 .firmware_cb = lp5523_firmware_loaded, 707 .run_engine = lp5523_run_engine, 708 .dev_attr_group = &lp5523_group, 709 }; 710 711 static int lp5523_probe(struct i2c_client *client, 712 const struct i2c_device_id *id) 713 { 714 int ret; 715 struct lp55xx_chip *chip; 716 struct lp55xx_led *led; 717 struct lp55xx_platform_data *pdata; 718 struct device_node *np = client->dev.of_node; 719 720 if (!dev_get_platdata(&client->dev)) { 721 if (np) { 722 ret = lp55xx_of_populate_pdata(&client->dev, np); 723 if (ret < 0) 724 return ret; 725 } else { 726 dev_err(&client->dev, "no platform data\n"); 727 return -EINVAL; 728 } 729 } 730 pdata = dev_get_platdata(&client->dev); 731 732 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 733 if (!chip) 734 return -ENOMEM; 735 736 led = devm_kzalloc(&client->dev, 737 sizeof(*led) * pdata->num_channels, GFP_KERNEL); 738 if (!led) 739 return -ENOMEM; 740 741 chip->cl = client; 742 chip->pdata = pdata; 743 chip->cfg = &lp5523_cfg; 744 745 mutex_init(&chip->lock); 746 747 i2c_set_clientdata(client, led); 748 749 ret = lp55xx_init_device(chip); 750 if (ret) 751 goto err_init; 752 753 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 754 755 ret = lp55xx_register_leds(led, chip); 756 if (ret) 757 goto err_register_leds; 758 759 ret = lp55xx_register_sysfs(chip); 760 if (ret) { 761 dev_err(&client->dev, "registering sysfs failed\n"); 762 goto err_register_sysfs; 763 } 764 765 return 0; 766 767 err_register_sysfs: 768 lp55xx_unregister_leds(led, chip); 769 err_register_leds: 770 lp55xx_deinit_device(chip); 771 err_init: 772 return ret; 773 } 774 775 static int lp5523_remove(struct i2c_client *client) 776 { 777 struct lp55xx_led *led = i2c_get_clientdata(client); 778 struct lp55xx_chip *chip = led->chip; 779 780 lp5523_stop_engine(chip); 781 lp55xx_unregister_sysfs(chip); 782 lp55xx_unregister_leds(led, chip); 783 lp55xx_deinit_device(chip); 784 785 return 0; 786 } 787 788 static const struct i2c_device_id lp5523_id[] = { 789 { "lp5523", LP5523 }, 790 { "lp55231", LP55231 }, 791 { } 792 }; 793 794 MODULE_DEVICE_TABLE(i2c, lp5523_id); 795 796 #ifdef CONFIG_OF 797 static const struct of_device_id of_lp5523_leds_match[] = { 798 { .compatible = "national,lp5523", }, 799 {}, 800 }; 801 802 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 803 #endif 804 805 static struct i2c_driver lp5523_driver = { 806 .driver = { 807 .name = "lp5523x", 808 .of_match_table = of_match_ptr(of_lp5523_leds_match), 809 }, 810 .probe = lp5523_probe, 811 .remove = lp5523_remove, 812 .id_table = lp5523_id, 813 }; 814 815 module_i2c_driver(lp5523_driver); 816 817 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 818 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 819 MODULE_DESCRIPTION("LP5523 LED engine"); 820 MODULE_LICENSE("GPL"); 821