1 /* 2 * lp5523.c - LP5523, LP55231 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/leds.h> 29 #include <linux/module.h> 30 #include <linux/mutex.h> 31 #include <linux/of.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 /* bytes */ 38 /* Memory is used like this: 39 0x00 engine 1 program 40 0x10 engine 2 program 41 0x20 engine 3 program 42 0x30 engine 1 muxing info 43 0x40 engine 2 muxing info 44 0x50 engine 3 muxing info 45 */ 46 #define LP5523_MAX_LEDS 9 47 48 /* Registers */ 49 #define LP5523_REG_ENABLE 0x00 50 #define LP5523_REG_OP_MODE 0x01 51 #define LP5523_REG_ENABLE_LEDS_MSB 0x04 52 #define LP5523_REG_ENABLE_LEDS_LSB 0x05 53 #define LP5523_REG_LED_PWM_BASE 0x16 54 #define LP5523_REG_LED_CURRENT_BASE 0x26 55 #define LP5523_REG_CONFIG 0x36 56 #define LP5523_REG_STATUS 0x3A 57 #define LP5523_REG_RESET 0x3D 58 #define LP5523_REG_LED_TEST_CTRL 0x41 59 #define LP5523_REG_LED_TEST_ADC 0x42 60 #define LP5523_REG_CH1_PROG_START 0x4C 61 #define LP5523_REG_CH2_PROG_START 0x4D 62 #define LP5523_REG_CH3_PROG_START 0x4E 63 #define LP5523_REG_PROG_PAGE_SEL 0x4F 64 #define LP5523_REG_PROG_MEM 0x50 65 66 /* Bit description in registers */ 67 #define LP5523_ENABLE 0x40 68 #define LP5523_AUTO_INC 0x40 69 #define LP5523_PWR_SAVE 0x20 70 #define LP5523_PWM_PWR_SAVE 0x04 71 #define LP5523_CP_AUTO 0x18 72 #define LP5523_AUTO_CLK 0x02 73 74 #define LP5523_EN_LEDTEST 0x80 75 #define LP5523_LEDTEST_DONE 0x80 76 #define LP5523_RESET 0xFF 77 #define LP5523_ADC_SHORTCIRC_LIM 80 78 #define LP5523_EXT_CLK_USED 0x08 79 #define LP5523_ENG_STATUS_MASK 0x07 80 81 /* Memory Page Selection */ 82 #define LP5523_PAGE_ENG1 0 83 #define LP5523_PAGE_ENG2 1 84 #define LP5523_PAGE_ENG3 2 85 #define LP5523_PAGE_MUX1 3 86 #define LP5523_PAGE_MUX2 4 87 #define LP5523_PAGE_MUX3 5 88 89 /* Program Memory Operations */ 90 #define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */ 91 #define LP5523_MODE_ENG2_M 0x0C 92 #define LP5523_MODE_ENG3_M 0x03 93 #define LP5523_LOAD_ENG1 0x10 94 #define LP5523_LOAD_ENG2 0x04 95 #define LP5523_LOAD_ENG3 0x01 96 97 #define LP5523_ENG1_IS_LOADING(mode) \ 98 ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1) 99 #define LP5523_ENG2_IS_LOADING(mode) \ 100 ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2) 101 #define LP5523_ENG3_IS_LOADING(mode) \ 102 ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3) 103 104 #define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */ 105 #define LP5523_EXEC_ENG2_M 0x0C 106 #define LP5523_EXEC_ENG3_M 0x03 107 #define LP5523_EXEC_M 0x3F 108 #define LP5523_RUN_ENG1 0x20 109 #define LP5523_RUN_ENG2 0x08 110 #define LP5523_RUN_ENG3 0x02 111 112 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) 113 114 enum lp5523_chip_id { 115 LP5523, 116 LP55231, 117 }; 118 119 static int lp5523_init_program_engine(struct lp55xx_chip *chip); 120 121 static inline void lp5523_wait_opmode_done(void) 122 { 123 usleep_range(1000, 2000); 124 } 125 126 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current) 127 { 128 led->led_current = led_current; 129 lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 130 led_current); 131 } 132 133 static int lp5523_post_init_device(struct lp55xx_chip *chip) 134 { 135 int ret; 136 137 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE); 138 if (ret) 139 return ret; 140 141 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 142 usleep_range(1000, 2000); 143 144 ret = lp55xx_write(chip, LP5523_REG_CONFIG, 145 LP5523_AUTO_INC | LP5523_PWR_SAVE | 146 LP5523_CP_AUTO | LP5523_AUTO_CLK | 147 LP5523_PWM_PWR_SAVE); 148 if (ret) 149 return ret; 150 151 /* turn on all leds */ 152 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 153 if (ret) 154 return ret; 155 156 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 157 if (ret) 158 return ret; 159 160 return lp5523_init_program_engine(chip); 161 } 162 163 static void lp5523_load_engine(struct lp55xx_chip *chip) 164 { 165 enum lp55xx_engine_index idx = chip->engine_idx; 166 u8 mask[] = { 167 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 168 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 169 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 170 }; 171 172 u8 val[] = { 173 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1, 174 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2, 175 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3, 176 }; 177 178 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]); 179 180 lp5523_wait_opmode_done(); 181 } 182 183 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip) 184 { 185 enum lp55xx_engine_index idx = chip->engine_idx; 186 u8 page_sel[] = { 187 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1, 188 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2, 189 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3, 190 }; 191 192 lp5523_load_engine(chip); 193 194 lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]); 195 } 196 197 static void lp5523_stop_all_engines(struct lp55xx_chip *chip) 198 { 199 lp55xx_write(chip, LP5523_REG_OP_MODE, 0); 200 lp5523_wait_opmode_done(); 201 } 202 203 static void lp5523_stop_engine(struct lp55xx_chip *chip) 204 { 205 enum lp55xx_engine_index idx = chip->engine_idx; 206 u8 mask[] = { 207 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 208 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 209 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 210 }; 211 212 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0); 213 214 lp5523_wait_opmode_done(); 215 } 216 217 static void lp5523_turn_off_channels(struct lp55xx_chip *chip) 218 { 219 int i; 220 221 for (i = 0; i < LP5523_MAX_LEDS; i++) 222 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0); 223 } 224 225 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start) 226 { 227 int ret; 228 u8 mode; 229 u8 exec; 230 231 /* stop engine */ 232 if (!start) { 233 lp5523_stop_engine(chip); 234 lp5523_turn_off_channels(chip); 235 return; 236 } 237 238 /* 239 * To run the engine, 240 * operation mode and enable register should updated at the same time 241 */ 242 243 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode); 244 if (ret) 245 return; 246 247 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec); 248 if (ret) 249 return; 250 251 /* change operation mode to RUN only when each engine is loading */ 252 if (LP5523_ENG1_IS_LOADING(mode)) { 253 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1; 254 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1; 255 } 256 257 if (LP5523_ENG2_IS_LOADING(mode)) { 258 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2; 259 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2; 260 } 261 262 if (LP5523_ENG3_IS_LOADING(mode)) { 263 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3; 264 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3; 265 } 266 267 lp55xx_write(chip, LP5523_REG_OP_MODE, mode); 268 lp5523_wait_opmode_done(); 269 270 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec); 271 } 272 273 static int lp5523_init_program_engine(struct lp55xx_chip *chip) 274 { 275 int i; 276 int j; 277 int ret; 278 u8 status; 279 /* one pattern per engine setting LED MUX start and stop addresses */ 280 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { 281 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 282 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 283 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 284 }; 285 286 /* hardcode 32 bytes of memory for each engine from program memory */ 287 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00); 288 if (ret) 289 return ret; 290 291 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10); 292 if (ret) 293 return ret; 294 295 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20); 296 if (ret) 297 return ret; 298 299 /* write LED MUX address space for each engine */ 300 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 301 chip->engine_idx = i; 302 lp5523_load_engine_and_select_page(chip); 303 304 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) { 305 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j, 306 pattern[i - 1][j]); 307 if (ret) 308 goto out; 309 } 310 } 311 312 lp5523_run_engine(chip, true); 313 314 /* Let the programs run for couple of ms and check the engine status */ 315 usleep_range(3000, 6000); 316 lp55xx_read(chip, LP5523_REG_STATUS, &status); 317 status &= LP5523_ENG_STATUS_MASK; 318 319 if (status != LP5523_ENG_STATUS_MASK) { 320 dev_err(&chip->cl->dev, 321 "cound not configure LED engine, status = 0x%.2x\n", 322 status); 323 ret = -1; 324 } 325 326 out: 327 lp5523_stop_all_engines(chip); 328 return ret; 329 } 330 331 static int lp5523_update_program_memory(struct lp55xx_chip *chip, 332 const u8 *data, size_t size) 333 { 334 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 335 unsigned cmd; 336 char c[3]; 337 int nrchars; 338 int ret; 339 int offset = 0; 340 int i = 0; 341 342 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) { 343 /* separate sscanfs because length is working only for %s */ 344 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 345 if (ret != 1) 346 goto err; 347 348 ret = sscanf(c, "%2x", &cmd); 349 if (ret != 1) 350 goto err; 351 352 pattern[i] = (u8)cmd; 353 offset += nrchars; 354 i++; 355 } 356 357 /* Each instruction is 16bit long. Check that length is even */ 358 if (i % 2) 359 goto err; 360 361 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { 362 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); 363 if (ret) 364 return -EINVAL; 365 } 366 367 return size; 368 369 err: 370 dev_err(&chip->cl->dev, "wrong pattern format\n"); 371 return -EINVAL; 372 } 373 374 static void lp5523_firmware_loaded(struct lp55xx_chip *chip) 375 { 376 const struct firmware *fw = chip->fw; 377 378 if (fw->size > LP5523_PROGRAM_LENGTH) { 379 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 380 fw->size); 381 return; 382 } 383 384 /* 385 * Program momery sequence 386 * 1) set engine mode to "LOAD" 387 * 2) write firmware data into program memory 388 */ 389 390 lp5523_load_engine_and_select_page(chip); 391 lp5523_update_program_memory(chip, fw->data, fw->size); 392 } 393 394 static ssize_t show_engine_mode(struct device *dev, 395 struct device_attribute *attr, 396 char *buf, int nr) 397 { 398 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 399 struct lp55xx_chip *chip = led->chip; 400 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; 401 402 switch (mode) { 403 case LP55XX_ENGINE_RUN: 404 return sprintf(buf, "run\n"); 405 case LP55XX_ENGINE_LOAD: 406 return sprintf(buf, "load\n"); 407 case LP55XX_ENGINE_DISABLED: 408 default: 409 return sprintf(buf, "disabled\n"); 410 } 411 } 412 show_mode(1) 413 show_mode(2) 414 show_mode(3) 415 416 static ssize_t store_engine_mode(struct device *dev, 417 struct device_attribute *attr, 418 const char *buf, size_t len, int nr) 419 { 420 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 421 struct lp55xx_chip *chip = led->chip; 422 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 423 424 mutex_lock(&chip->lock); 425 426 chip->engine_idx = nr; 427 428 if (!strncmp(buf, "run", 3)) { 429 lp5523_run_engine(chip, true); 430 engine->mode = LP55XX_ENGINE_RUN; 431 } else if (!strncmp(buf, "load", 4)) { 432 lp5523_stop_engine(chip); 433 lp5523_load_engine(chip); 434 engine->mode = LP55XX_ENGINE_LOAD; 435 } else if (!strncmp(buf, "disabled", 8)) { 436 lp5523_stop_engine(chip); 437 engine->mode = LP55XX_ENGINE_DISABLED; 438 } 439 440 mutex_unlock(&chip->lock); 441 442 return len; 443 } 444 store_mode(1) 445 store_mode(2) 446 store_mode(3) 447 448 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 449 { 450 u16 tmp_mux = 0; 451 int i; 452 453 len = min_t(int, len, LP5523_MAX_LEDS); 454 455 for (i = 0; i < len; i++) { 456 switch (buf[i]) { 457 case '1': 458 tmp_mux |= (1 << i); 459 break; 460 case '0': 461 break; 462 case '\n': 463 i = len; 464 break; 465 default: 466 return -1; 467 } 468 } 469 *mux = tmp_mux; 470 471 return 0; 472 } 473 474 static void lp5523_mux_to_array(u16 led_mux, char *array) 475 { 476 int i, pos = 0; 477 for (i = 0; i < LP5523_MAX_LEDS; i++) 478 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 479 480 array[pos] = '\0'; 481 } 482 483 static ssize_t show_engine_leds(struct device *dev, 484 struct device_attribute *attr, 485 char *buf, int nr) 486 { 487 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 488 struct lp55xx_chip *chip = led->chip; 489 char mux[LP5523_MAX_LEDS + 1]; 490 491 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 492 493 return sprintf(buf, "%s\n", mux); 494 } 495 show_leds(1) 496 show_leds(2) 497 show_leds(3) 498 499 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 500 { 501 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 502 int ret; 503 u8 mux_page[] = { 504 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 505 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 506 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 507 }; 508 509 lp5523_load_engine(chip); 510 511 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 512 if (ret) 513 return ret; 514 515 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8)); 516 if (ret) 517 return ret; 518 519 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 520 if (ret) 521 return ret; 522 523 engine->led_mux = mux; 524 return 0; 525 } 526 527 static ssize_t store_engine_leds(struct device *dev, 528 struct device_attribute *attr, 529 const char *buf, size_t len, int nr) 530 { 531 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 532 struct lp55xx_chip *chip = led->chip; 533 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 534 u16 mux = 0; 535 ssize_t ret; 536 537 if (lp5523_mux_parse(buf, &mux, len)) 538 return -EINVAL; 539 540 mutex_lock(&chip->lock); 541 542 chip->engine_idx = nr; 543 ret = -EINVAL; 544 545 if (engine->mode != LP55XX_ENGINE_LOAD) 546 goto leave; 547 548 if (lp5523_load_mux(chip, mux, nr)) 549 goto leave; 550 551 ret = len; 552 leave: 553 mutex_unlock(&chip->lock); 554 return ret; 555 } 556 store_leds(1) 557 store_leds(2) 558 store_leds(3) 559 560 static ssize_t store_engine_load(struct device *dev, 561 struct device_attribute *attr, 562 const char *buf, size_t len, int nr) 563 { 564 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 565 struct lp55xx_chip *chip = led->chip; 566 int ret; 567 568 mutex_lock(&chip->lock); 569 570 chip->engine_idx = nr; 571 lp5523_load_engine_and_select_page(chip); 572 ret = lp5523_update_program_memory(chip, buf, len); 573 574 mutex_unlock(&chip->lock); 575 576 return ret; 577 } 578 store_load(1) 579 store_load(2) 580 store_load(3) 581 582 static ssize_t lp5523_selftest(struct device *dev, 583 struct device_attribute *attr, 584 char *buf) 585 { 586 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 587 struct lp55xx_chip *chip = led->chip; 588 struct lp55xx_platform_data *pdata = chip->pdata; 589 int i, ret, pos = 0; 590 u8 status, adc, vdd; 591 592 mutex_lock(&chip->lock); 593 594 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 595 if (ret < 0) 596 goto fail; 597 598 /* Check that ext clock is really in use if requested */ 599 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 600 if ((status & LP5523_EXT_CLK_USED) == 0) 601 goto fail; 602 } 603 604 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 605 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 606 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 607 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 608 if (ret < 0) 609 goto fail; 610 611 if (!(status & LP5523_LEDTEST_DONE)) 612 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 613 614 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 615 if (ret < 0) 616 goto fail; 617 618 vdd--; /* There may be some fluctuation in measurement */ 619 620 for (i = 0; i < LP5523_MAX_LEDS; i++) { 621 /* Skip non-existing channels */ 622 if (pdata->led_config[i].led_current == 0) 623 continue; 624 625 /* Set default current */ 626 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 627 pdata->led_config[i].led_current); 628 629 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 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 | i); 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", i); 649 650 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00); 651 652 /* Restore current */ 653 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 654 led->led_current); 655 led++; 656 } 657 if (pos == 0) 658 pos = sprintf(buf, "OK\n"); 659 goto release_lock; 660 fail: 661 pos = sprintf(buf, "FAIL\n"); 662 663 release_lock: 664 mutex_unlock(&chip->lock); 665 666 return pos; 667 } 668 669 static void lp5523_led_brightness_work(struct work_struct *work) 670 { 671 struct lp55xx_led *led = container_of(work, struct lp55xx_led, 672 brightness_work); 673 struct lp55xx_chip *chip = led->chip; 674 675 mutex_lock(&chip->lock); 676 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 677 led->brightness); 678 mutex_unlock(&chip->lock); 679 } 680 681 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 682 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 683 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 684 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 685 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 686 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 687 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 688 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 689 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 690 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 691 692 static struct attribute *lp5523_attributes[] = { 693 &dev_attr_engine1_mode.attr, 694 &dev_attr_engine2_mode.attr, 695 &dev_attr_engine3_mode.attr, 696 &dev_attr_engine1_load.attr, 697 &dev_attr_engine2_load.attr, 698 &dev_attr_engine3_load.attr, 699 &dev_attr_engine1_leds.attr, 700 &dev_attr_engine2_leds.attr, 701 &dev_attr_engine3_leds.attr, 702 &dev_attr_selftest.attr, 703 NULL, 704 }; 705 706 static const struct attribute_group lp5523_group = { 707 .attrs = lp5523_attributes, 708 }; 709 710 /* Chip specific configurations */ 711 static struct lp55xx_device_config lp5523_cfg = { 712 .reset = { 713 .addr = LP5523_REG_RESET, 714 .val = LP5523_RESET, 715 }, 716 .enable = { 717 .addr = LP5523_REG_ENABLE, 718 .val = LP5523_ENABLE, 719 }, 720 .max_channel = LP5523_MAX_LEDS, 721 .post_init_device = lp5523_post_init_device, 722 .brightness_work_fn = lp5523_led_brightness_work, 723 .set_led_current = lp5523_set_led_current, 724 .firmware_cb = lp5523_firmware_loaded, 725 .run_engine = lp5523_run_engine, 726 .dev_attr_group = &lp5523_group, 727 }; 728 729 static int lp5523_probe(struct i2c_client *client, 730 const struct i2c_device_id *id) 731 { 732 int ret; 733 struct lp55xx_chip *chip; 734 struct lp55xx_led *led; 735 struct lp55xx_platform_data *pdata; 736 struct device_node *np = client->dev.of_node; 737 738 if (!dev_get_platdata(&client->dev)) { 739 if (np) { 740 ret = lp55xx_of_populate_pdata(&client->dev, np); 741 if (ret < 0) 742 return ret; 743 } else { 744 dev_err(&client->dev, "no platform data\n"); 745 return -EINVAL; 746 } 747 } 748 pdata = dev_get_platdata(&client->dev); 749 750 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 751 if (!chip) 752 return -ENOMEM; 753 754 led = devm_kzalloc(&client->dev, 755 sizeof(*led) * pdata->num_channels, GFP_KERNEL); 756 if (!led) 757 return -ENOMEM; 758 759 chip->cl = client; 760 chip->pdata = pdata; 761 chip->cfg = &lp5523_cfg; 762 763 mutex_init(&chip->lock); 764 765 i2c_set_clientdata(client, led); 766 767 ret = lp55xx_init_device(chip); 768 if (ret) 769 goto err_init; 770 771 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 772 773 ret = lp55xx_register_leds(led, chip); 774 if (ret) 775 goto err_register_leds; 776 777 ret = lp55xx_register_sysfs(chip); 778 if (ret) { 779 dev_err(&client->dev, "registering sysfs failed\n"); 780 goto err_register_sysfs; 781 } 782 783 return 0; 784 785 err_register_sysfs: 786 lp55xx_unregister_leds(led, chip); 787 err_register_leds: 788 lp55xx_deinit_device(chip); 789 err_init: 790 return ret; 791 } 792 793 static int lp5523_remove(struct i2c_client *client) 794 { 795 struct lp55xx_led *led = i2c_get_clientdata(client); 796 struct lp55xx_chip *chip = led->chip; 797 798 lp5523_stop_all_engines(chip); 799 lp55xx_unregister_sysfs(chip); 800 lp55xx_unregister_leds(led, chip); 801 lp55xx_deinit_device(chip); 802 803 return 0; 804 } 805 806 static const struct i2c_device_id lp5523_id[] = { 807 { "lp5523", LP5523 }, 808 { "lp55231", LP55231 }, 809 { } 810 }; 811 812 MODULE_DEVICE_TABLE(i2c, lp5523_id); 813 814 #ifdef CONFIG_OF 815 static const struct of_device_id of_lp5523_leds_match[] = { 816 { .compatible = "national,lp5523", }, 817 { .compatible = "ti,lp55231", }, 818 {}, 819 }; 820 821 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 822 #endif 823 824 static struct i2c_driver lp5523_driver = { 825 .driver = { 826 .name = "lp5523x", 827 .of_match_table = of_match_ptr(of_lp5523_leds_match), 828 }, 829 .probe = lp5523_probe, 830 .remove = lp5523_remove, 831 .id_table = lp5523_id, 832 }; 833 834 module_i2c_driver(lp5523_driver); 835 836 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 837 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 838 MODULE_DESCRIPTION("LP5523 LED engine"); 839 MODULE_LICENSE("GPL"); 840