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/of.h> 33 #include <linux/platform_data/leds-lp55xx.h> 34 #include <linux/slab.h> 35 36 #include "leds-lp55xx-common.h" 37 38 #define LP5523_PROGRAM_LENGTH 32 39 #define LP5523_MAX_LEDS 9 40 41 /* Registers */ 42 #define LP5523_REG_ENABLE 0x00 43 #define LP5523_REG_OP_MODE 0x01 44 #define LP5523_REG_ENABLE_LEDS_MSB 0x04 45 #define LP5523_REG_ENABLE_LEDS_LSB 0x05 46 #define LP5523_REG_LED_PWM_BASE 0x16 47 #define LP5523_REG_LED_CURRENT_BASE 0x26 48 #define LP5523_REG_CONFIG 0x36 49 #define LP5523_REG_STATUS 0x3A 50 #define LP5523_REG_RESET 0x3D 51 #define LP5523_REG_LED_TEST_CTRL 0x41 52 #define LP5523_REG_LED_TEST_ADC 0x42 53 #define LP5523_REG_CH1_PROG_START 0x4C 54 #define LP5523_REG_CH2_PROG_START 0x4D 55 #define LP5523_REG_CH3_PROG_START 0x4E 56 #define LP5523_REG_PROG_PAGE_SEL 0x4F 57 #define LP5523_REG_PROG_MEM 0x50 58 59 /* Bit description in registers */ 60 #define LP5523_ENABLE 0x40 61 #define LP5523_AUTO_INC 0x40 62 #define LP5523_PWR_SAVE 0x20 63 #define LP5523_PWM_PWR_SAVE 0x04 64 #define LP5523_CP_AUTO 0x18 65 #define LP5523_AUTO_CLK 0x02 66 67 #define LP5523_EN_LEDTEST 0x80 68 #define LP5523_LEDTEST_DONE 0x80 69 #define LP5523_RESET 0xFF 70 #define LP5523_ADC_SHORTCIRC_LIM 80 71 #define LP5523_EXT_CLK_USED 0x08 72 #define LP5523_ENG_STATUS_MASK 0x07 73 74 /* Memory Page Selection */ 75 #define LP5523_PAGE_ENG1 0 76 #define LP5523_PAGE_ENG2 1 77 #define LP5523_PAGE_ENG3 2 78 #define LP5523_PAGE_MUX1 3 79 #define LP5523_PAGE_MUX2 4 80 #define LP5523_PAGE_MUX3 5 81 82 /* Program Memory Operations */ 83 #define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */ 84 #define LP5523_MODE_ENG2_M 0x0C 85 #define LP5523_MODE_ENG3_M 0x03 86 #define LP5523_LOAD_ENG1 0x10 87 #define LP5523_LOAD_ENG2 0x04 88 #define LP5523_LOAD_ENG3 0x01 89 90 #define LP5523_ENG1_IS_LOADING(mode) \ 91 ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1) 92 #define LP5523_ENG2_IS_LOADING(mode) \ 93 ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2) 94 #define LP5523_ENG3_IS_LOADING(mode) \ 95 ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3) 96 97 #define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */ 98 #define LP5523_EXEC_ENG2_M 0x0C 99 #define LP5523_EXEC_ENG3_M 0x03 100 #define LP5523_EXEC_M 0x3F 101 #define LP5523_RUN_ENG1 0x20 102 #define LP5523_RUN_ENG2 0x08 103 #define LP5523_RUN_ENG3 0x02 104 105 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) 106 107 enum lp5523_chip_id { 108 LP5523, 109 LP55231, 110 }; 111 112 static int lp5523_init_program_engine(struct lp55xx_chip *chip); 113 114 static inline void lp5523_wait_opmode_done(void) 115 { 116 usleep_range(1000, 2000); 117 } 118 119 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current) 120 { 121 led->led_current = led_current; 122 lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 123 led_current); 124 } 125 126 static int lp5523_post_init_device(struct lp55xx_chip *chip) 127 { 128 int ret; 129 130 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE); 131 if (ret) 132 return ret; 133 134 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 135 usleep_range(1000, 2000); 136 137 ret = lp55xx_write(chip, LP5523_REG_CONFIG, 138 LP5523_AUTO_INC | LP5523_PWR_SAVE | 139 LP5523_CP_AUTO | LP5523_AUTO_CLK | 140 LP5523_PWM_PWR_SAVE); 141 if (ret) 142 return ret; 143 144 /* turn on all leds */ 145 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 146 if (ret) 147 return ret; 148 149 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 150 if (ret) 151 return ret; 152 153 return lp5523_init_program_engine(chip); 154 } 155 156 static void lp5523_load_engine(struct lp55xx_chip *chip) 157 { 158 enum lp55xx_engine_index idx = chip->engine_idx; 159 u8 mask[] = { 160 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 161 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 162 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 163 }; 164 165 u8 val[] = { 166 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1, 167 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2, 168 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3, 169 }; 170 171 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]); 172 173 lp5523_wait_opmode_done(); 174 } 175 176 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip) 177 { 178 enum lp55xx_engine_index idx = chip->engine_idx; 179 u8 page_sel[] = { 180 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1, 181 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2, 182 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3, 183 }; 184 185 lp5523_load_engine(chip); 186 187 lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]); 188 } 189 190 static void lp5523_stop_engine(struct lp55xx_chip *chip) 191 { 192 lp55xx_write(chip, LP5523_REG_OP_MODE, 0); 193 lp5523_wait_opmode_done(); 194 } 195 196 static void lp5523_turn_off_channels(struct lp55xx_chip *chip) 197 { 198 int i; 199 200 for (i = 0; i < LP5523_MAX_LEDS; i++) 201 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0); 202 } 203 204 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start) 205 { 206 int ret; 207 u8 mode; 208 u8 exec; 209 210 /* stop engine */ 211 if (!start) { 212 lp5523_stop_engine(chip); 213 lp5523_turn_off_channels(chip); 214 return; 215 } 216 217 /* 218 * To run the engine, 219 * operation mode and enable register should updated at the same time 220 */ 221 222 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode); 223 if (ret) 224 return; 225 226 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec); 227 if (ret) 228 return; 229 230 /* change operation mode to RUN only when each engine is loading */ 231 if (LP5523_ENG1_IS_LOADING(mode)) { 232 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1; 233 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1; 234 } 235 236 if (LP5523_ENG2_IS_LOADING(mode)) { 237 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2; 238 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2; 239 } 240 241 if (LP5523_ENG3_IS_LOADING(mode)) { 242 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3; 243 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3; 244 } 245 246 lp55xx_write(chip, LP5523_REG_OP_MODE, mode); 247 lp5523_wait_opmode_done(); 248 249 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec); 250 } 251 252 static int lp5523_init_program_engine(struct lp55xx_chip *chip) 253 { 254 int i; 255 int j; 256 int ret; 257 u8 status; 258 /* one pattern per engine setting LED MUX start and stop addresses */ 259 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { 260 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 261 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 262 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 263 }; 264 265 /* hardcode 32 bytes of memory for each engine from program memory */ 266 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00); 267 if (ret) 268 return ret; 269 270 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10); 271 if (ret) 272 return ret; 273 274 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20); 275 if (ret) 276 return ret; 277 278 /* write LED MUX address space for each engine */ 279 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 280 chip->engine_idx = i; 281 lp5523_load_engine_and_select_page(chip); 282 283 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) { 284 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j, 285 pattern[i - 1][j]); 286 if (ret) 287 goto out; 288 } 289 } 290 291 lp5523_run_engine(chip, true); 292 293 /* Let the programs run for couple of ms and check the engine status */ 294 usleep_range(3000, 6000); 295 lp55xx_read(chip, LP5523_REG_STATUS, &status); 296 status &= LP5523_ENG_STATUS_MASK; 297 298 if (status != LP5523_ENG_STATUS_MASK) { 299 dev_err(&chip->cl->dev, 300 "cound not configure LED engine, status = 0x%.2x\n", 301 status); 302 ret = -1; 303 } 304 305 out: 306 lp5523_stop_engine(chip); 307 return ret; 308 } 309 310 static int lp5523_update_program_memory(struct lp55xx_chip *chip, 311 const u8 *data, size_t size) 312 { 313 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 314 unsigned cmd; 315 char c[3]; 316 int nrchars; 317 int ret; 318 int offset = 0; 319 int i = 0; 320 321 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) { 322 /* separate sscanfs because length is working only for %s */ 323 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 324 if (ret != 1) 325 goto err; 326 327 ret = sscanf(c, "%2x", &cmd); 328 if (ret != 1) 329 goto err; 330 331 pattern[i] = (u8)cmd; 332 offset += nrchars; 333 i++; 334 } 335 336 /* Each instruction is 16bit long. Check that length is even */ 337 if (i % 2) 338 goto err; 339 340 mutex_lock(&chip->lock); 341 342 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { 343 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); 344 if (ret) { 345 mutex_unlock(&chip->lock); 346 return -EINVAL; 347 } 348 } 349 350 mutex_unlock(&chip->lock); 351 352 return size; 353 354 err: 355 dev_err(&chip->cl->dev, "wrong pattern format\n"); 356 return -EINVAL; 357 } 358 359 static void lp5523_firmware_loaded(struct lp55xx_chip *chip) 360 { 361 const struct firmware *fw = chip->fw; 362 363 if (fw->size > LP5523_PROGRAM_LENGTH) { 364 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 365 fw->size); 366 return; 367 } 368 369 /* 370 * Program momery sequence 371 * 1) set engine mode to "LOAD" 372 * 2) write firmware data into program memory 373 */ 374 375 lp5523_load_engine_and_select_page(chip); 376 lp5523_update_program_memory(chip, fw->data, fw->size); 377 } 378 379 static ssize_t show_engine_mode(struct device *dev, 380 struct device_attribute *attr, 381 char *buf, int nr) 382 { 383 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 384 struct lp55xx_chip *chip = led->chip; 385 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; 386 387 switch (mode) { 388 case LP55XX_ENGINE_RUN: 389 return sprintf(buf, "run\n"); 390 case LP55XX_ENGINE_LOAD: 391 return sprintf(buf, "load\n"); 392 case LP55XX_ENGINE_DISABLED: 393 default: 394 return sprintf(buf, "disabled\n"); 395 } 396 } 397 show_mode(1) 398 show_mode(2) 399 show_mode(3) 400 401 static ssize_t store_engine_mode(struct device *dev, 402 struct device_attribute *attr, 403 const char *buf, size_t len, int nr) 404 { 405 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 406 struct lp55xx_chip *chip = led->chip; 407 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 408 409 mutex_lock(&chip->lock); 410 411 chip->engine_idx = nr; 412 413 if (!strncmp(buf, "run", 3)) { 414 lp5523_run_engine(chip, true); 415 engine->mode = LP55XX_ENGINE_RUN; 416 } else if (!strncmp(buf, "load", 4)) { 417 lp5523_stop_engine(chip); 418 lp5523_load_engine(chip); 419 engine->mode = LP55XX_ENGINE_LOAD; 420 } else if (!strncmp(buf, "disabled", 8)) { 421 lp5523_stop_engine(chip); 422 engine->mode = LP55XX_ENGINE_DISABLED; 423 } 424 425 mutex_unlock(&chip->lock); 426 427 return len; 428 } 429 store_mode(1) 430 store_mode(2) 431 store_mode(3) 432 433 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 434 { 435 u16 tmp_mux = 0; 436 int i; 437 438 len = min_t(int, len, LP5523_MAX_LEDS); 439 440 for (i = 0; i < len; i++) { 441 switch (buf[i]) { 442 case '1': 443 tmp_mux |= (1 << i); 444 break; 445 case '0': 446 break; 447 case '\n': 448 i = len; 449 break; 450 default: 451 return -1; 452 } 453 } 454 *mux = tmp_mux; 455 456 return 0; 457 } 458 459 static void lp5523_mux_to_array(u16 led_mux, char *array) 460 { 461 int i, pos = 0; 462 for (i = 0; i < LP5523_MAX_LEDS; i++) 463 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 464 465 array[pos] = '\0'; 466 } 467 468 static ssize_t show_engine_leds(struct device *dev, 469 struct device_attribute *attr, 470 char *buf, int nr) 471 { 472 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 473 struct lp55xx_chip *chip = led->chip; 474 char mux[LP5523_MAX_LEDS + 1]; 475 476 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 477 478 return sprintf(buf, "%s\n", mux); 479 } 480 show_leds(1) 481 show_leds(2) 482 show_leds(3) 483 484 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 485 { 486 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 487 int ret; 488 u8 mux_page[] = { 489 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 490 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 491 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 492 }; 493 494 lp5523_load_engine(chip); 495 496 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 497 if (ret) 498 return ret; 499 500 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8)); 501 if (ret) 502 return ret; 503 504 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 505 if (ret) 506 return ret; 507 508 engine->led_mux = mux; 509 return 0; 510 } 511 512 static ssize_t store_engine_leds(struct device *dev, 513 struct device_attribute *attr, 514 const char *buf, size_t len, int nr) 515 { 516 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 517 struct lp55xx_chip *chip = led->chip; 518 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 519 u16 mux = 0; 520 ssize_t ret; 521 522 if (lp5523_mux_parse(buf, &mux, len)) 523 return -EINVAL; 524 525 mutex_lock(&chip->lock); 526 527 chip->engine_idx = nr; 528 ret = -EINVAL; 529 530 if (engine->mode != LP55XX_ENGINE_LOAD) 531 goto leave; 532 533 if (lp5523_load_mux(chip, mux, nr)) 534 goto leave; 535 536 ret = len; 537 leave: 538 mutex_unlock(&chip->lock); 539 return ret; 540 } 541 store_leds(1) 542 store_leds(2) 543 store_leds(3) 544 545 static ssize_t store_engine_load(struct device *dev, 546 struct device_attribute *attr, 547 const char *buf, size_t len, int nr) 548 { 549 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 550 struct lp55xx_chip *chip = led->chip; 551 552 mutex_lock(&chip->lock); 553 554 chip->engine_idx = nr; 555 lp5523_load_engine_and_select_page(chip); 556 557 mutex_unlock(&chip->lock); 558 559 return lp5523_update_program_memory(chip, buf, len); 560 } 561 store_load(1) 562 store_load(2) 563 store_load(3) 564 565 static ssize_t lp5523_selftest(struct device *dev, 566 struct device_attribute *attr, 567 char *buf) 568 { 569 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 570 struct lp55xx_chip *chip = led->chip; 571 struct lp55xx_platform_data *pdata = chip->pdata; 572 int i, ret, pos = 0; 573 u8 status, adc, vdd; 574 575 mutex_lock(&chip->lock); 576 577 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 578 if (ret < 0) 579 goto fail; 580 581 /* Check that ext clock is really in use if requested */ 582 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 583 if ((status & LP5523_EXT_CLK_USED) == 0) 584 goto fail; 585 } 586 587 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 588 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 589 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 590 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 591 if (ret < 0) 592 goto fail; 593 594 if (!(status & LP5523_LEDTEST_DONE)) 595 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 596 597 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 598 if (ret < 0) 599 goto fail; 600 601 vdd--; /* There may be some fluctuation in measurement */ 602 603 for (i = 0; i < LP5523_MAX_LEDS; i++) { 604 /* Skip non-existing channels */ 605 if (pdata->led_config[i].led_current == 0) 606 continue; 607 608 /* Set default current */ 609 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 610 pdata->led_config[i].led_current); 611 612 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff); 613 /* let current stabilize 2 - 4ms before measurements start */ 614 usleep_range(2000, 4000); 615 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, 616 LP5523_EN_LEDTEST | i); 617 /* ADC conversion time is 2.7 ms typically */ 618 usleep_range(3000, 6000); 619 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 620 if (ret < 0) 621 goto fail; 622 623 if (!(status & LP5523_LEDTEST_DONE)) 624 usleep_range(3000, 6000);/* Was not ready. Wait. */ 625 626 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc); 627 if (ret < 0) 628 goto fail; 629 630 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 631 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 632 633 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00); 634 635 /* Restore current */ 636 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 637 led->led_current); 638 led++; 639 } 640 if (pos == 0) 641 pos = sprintf(buf, "OK\n"); 642 goto release_lock; 643 fail: 644 pos = sprintf(buf, "FAIL\n"); 645 646 release_lock: 647 mutex_unlock(&chip->lock); 648 649 return pos; 650 } 651 652 static void lp5523_led_brightness_work(struct work_struct *work) 653 { 654 struct lp55xx_led *led = container_of(work, struct lp55xx_led, 655 brightness_work); 656 struct lp55xx_chip *chip = led->chip; 657 658 mutex_lock(&chip->lock); 659 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 660 led->brightness); 661 mutex_unlock(&chip->lock); 662 } 663 664 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 665 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 666 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 667 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 668 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 669 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 670 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 671 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 672 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 673 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 674 675 static struct attribute *lp5523_attributes[] = { 676 &dev_attr_engine1_mode.attr, 677 &dev_attr_engine2_mode.attr, 678 &dev_attr_engine3_mode.attr, 679 &dev_attr_engine1_load.attr, 680 &dev_attr_engine2_load.attr, 681 &dev_attr_engine3_load.attr, 682 &dev_attr_engine1_leds.attr, 683 &dev_attr_engine2_leds.attr, 684 &dev_attr_engine3_leds.attr, 685 &dev_attr_selftest.attr, 686 NULL, 687 }; 688 689 static const struct attribute_group lp5523_group = { 690 .attrs = lp5523_attributes, 691 }; 692 693 /* Chip specific configurations */ 694 static struct lp55xx_device_config lp5523_cfg = { 695 .reset = { 696 .addr = LP5523_REG_RESET, 697 .val = LP5523_RESET, 698 }, 699 .enable = { 700 .addr = LP5523_REG_ENABLE, 701 .val = LP5523_ENABLE, 702 }, 703 .max_channel = LP5523_MAX_LEDS, 704 .post_init_device = lp5523_post_init_device, 705 .brightness_work_fn = lp5523_led_brightness_work, 706 .set_led_current = lp5523_set_led_current, 707 .firmware_cb = lp5523_firmware_loaded, 708 .run_engine = lp5523_run_engine, 709 .dev_attr_group = &lp5523_group, 710 }; 711 712 static int lp5523_probe(struct i2c_client *client, 713 const struct i2c_device_id *id) 714 { 715 int ret; 716 struct lp55xx_chip *chip; 717 struct lp55xx_led *led; 718 struct lp55xx_platform_data *pdata; 719 struct device_node *np = client->dev.of_node; 720 721 if (!dev_get_platdata(&client->dev)) { 722 if (np) { 723 ret = lp55xx_of_populate_pdata(&client->dev, np); 724 if (ret < 0) 725 return ret; 726 } else { 727 dev_err(&client->dev, "no platform data\n"); 728 return -EINVAL; 729 } 730 } 731 pdata = dev_get_platdata(&client->dev); 732 733 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 734 if (!chip) 735 return -ENOMEM; 736 737 led = devm_kzalloc(&client->dev, 738 sizeof(*led) * pdata->num_channels, GFP_KERNEL); 739 if (!led) 740 return -ENOMEM; 741 742 chip->cl = client; 743 chip->pdata = pdata; 744 chip->cfg = &lp5523_cfg; 745 746 mutex_init(&chip->lock); 747 748 i2c_set_clientdata(client, led); 749 750 ret = lp55xx_init_device(chip); 751 if (ret) 752 goto err_init; 753 754 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 755 756 ret = lp55xx_register_leds(led, chip); 757 if (ret) 758 goto err_register_leds; 759 760 ret = lp55xx_register_sysfs(chip); 761 if (ret) { 762 dev_err(&client->dev, "registering sysfs failed\n"); 763 goto err_register_sysfs; 764 } 765 766 return 0; 767 768 err_register_sysfs: 769 lp55xx_unregister_leds(led, chip); 770 err_register_leds: 771 lp55xx_deinit_device(chip); 772 err_init: 773 return ret; 774 } 775 776 static int lp5523_remove(struct i2c_client *client) 777 { 778 struct lp55xx_led *led = i2c_get_clientdata(client); 779 struct lp55xx_chip *chip = led->chip; 780 781 lp5523_stop_engine(chip); 782 lp55xx_unregister_sysfs(chip); 783 lp55xx_unregister_leds(led, chip); 784 lp55xx_deinit_device(chip); 785 786 return 0; 787 } 788 789 static const struct i2c_device_id lp5523_id[] = { 790 { "lp5523", LP5523 }, 791 { "lp55231", LP55231 }, 792 { } 793 }; 794 795 MODULE_DEVICE_TABLE(i2c, lp5523_id); 796 797 #ifdef CONFIG_OF 798 static const struct of_device_id of_lp5523_leds_match[] = { 799 { .compatible = "national,lp5523", }, 800 {}, 801 }; 802 803 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 804 #endif 805 806 static struct i2c_driver lp5523_driver = { 807 .driver = { 808 .name = "lp5523x", 809 .of_match_table = of_match_ptr(of_lp5523_leds_match), 810 }, 811 .probe = lp5523_probe, 812 .remove = lp5523_remove, 813 .id_table = lp5523_id, 814 }; 815 816 module_i2c_driver(lp5523_driver); 817 818 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 819 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 820 MODULE_DESCRIPTION("LP5523 LED engine"); 821 MODULE_LICENSE("GPL"); 822