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_AUTO 0x18 61 #define LP5523_AUTO_CLK 0x02 62 63 #define LP5523_EN_LEDTEST 0x80 64 #define LP5523_LEDTEST_DONE 0x80 65 #define LP5523_RESET 0xFF 66 #define LP5523_ADC_SHORTCIRC_LIM 80 67 #define LP5523_EXT_CLK_USED 0x08 68 #define LP5523_ENG_STATUS_MASK 0x07 69 70 #define LP5523_FADER_MAPPING_MASK 0xC0 71 #define LP5523_FADER_MAPPING_SHIFT 6 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 static const 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 static const 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 static const 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_all_engines(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_stop_engine(struct lp55xx_chip *chip) 196 { 197 enum lp55xx_engine_index idx = chip->engine_idx; 198 static const u8 mask[] = { 199 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 200 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 201 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 202 }; 203 204 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0); 205 206 lp5523_wait_opmode_done(); 207 } 208 209 static void lp5523_turn_off_channels(struct lp55xx_chip *chip) 210 { 211 int i; 212 213 for (i = 0; i < LP5523_MAX_LEDS; i++) 214 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0); 215 } 216 217 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start) 218 { 219 int ret; 220 u8 mode; 221 u8 exec; 222 223 /* stop engine */ 224 if (!start) { 225 lp5523_stop_engine(chip); 226 lp5523_turn_off_channels(chip); 227 return; 228 } 229 230 /* 231 * To run the engine, 232 * operation mode and enable register should updated at the same time 233 */ 234 235 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode); 236 if (ret) 237 return; 238 239 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec); 240 if (ret) 241 return; 242 243 /* change operation mode to RUN only when each engine is loading */ 244 if (LP5523_ENG1_IS_LOADING(mode)) { 245 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1; 246 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1; 247 } 248 249 if (LP5523_ENG2_IS_LOADING(mode)) { 250 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2; 251 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2; 252 } 253 254 if (LP5523_ENG3_IS_LOADING(mode)) { 255 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3; 256 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3; 257 } 258 259 lp55xx_write(chip, LP5523_REG_OP_MODE, mode); 260 lp5523_wait_opmode_done(); 261 262 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec); 263 } 264 265 static int lp5523_init_program_engine(struct lp55xx_chip *chip) 266 { 267 int i; 268 int j; 269 int ret; 270 u8 status; 271 /* one pattern per engine setting LED MUX start and stop addresses */ 272 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { 273 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 274 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 275 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 276 }; 277 278 /* hardcode 32 bytes of memory for each engine from program memory */ 279 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00); 280 if (ret) 281 return ret; 282 283 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10); 284 if (ret) 285 return ret; 286 287 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20); 288 if (ret) 289 return ret; 290 291 /* write LED MUX address space for each engine */ 292 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 293 chip->engine_idx = i; 294 lp5523_load_engine_and_select_page(chip); 295 296 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) { 297 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j, 298 pattern[i - 1][j]); 299 if (ret) 300 goto out; 301 } 302 } 303 304 lp5523_run_engine(chip, true); 305 306 /* Let the programs run for couple of ms and check the engine status */ 307 usleep_range(3000, 6000); 308 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 309 if (ret) 310 return ret; 311 status &= LP5523_ENG_STATUS_MASK; 312 313 if (status != LP5523_ENG_STATUS_MASK) { 314 dev_err(&chip->cl->dev, 315 "could not configure LED engine, status = 0x%.2x\n", 316 status); 317 ret = -1; 318 } 319 320 out: 321 lp5523_stop_all_engines(chip); 322 return ret; 323 } 324 325 static int lp5523_update_program_memory(struct lp55xx_chip *chip, 326 const u8 *data, size_t size) 327 { 328 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 329 unsigned cmd; 330 char c[3]; 331 int nrchars; 332 int ret; 333 int offset = 0; 334 int i = 0; 335 336 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) { 337 /* separate sscanfs because length is working only for %s */ 338 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 339 if (ret != 1) 340 goto err; 341 342 ret = sscanf(c, "%2x", &cmd); 343 if (ret != 1) 344 goto err; 345 346 pattern[i] = (u8)cmd; 347 offset += nrchars; 348 i++; 349 } 350 351 /* Each instruction is 16bit long. Check that length is even */ 352 if (i % 2) 353 goto err; 354 355 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { 356 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); 357 if (ret) 358 return -EINVAL; 359 } 360 361 return size; 362 363 err: 364 dev_err(&chip->cl->dev, "wrong pattern format\n"); 365 return -EINVAL; 366 } 367 368 static void lp5523_firmware_loaded(struct lp55xx_chip *chip) 369 { 370 const struct firmware *fw = chip->fw; 371 372 if (fw->size > LP5523_PROGRAM_LENGTH) { 373 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 374 fw->size); 375 return; 376 } 377 378 /* 379 * Program memory sequence 380 * 1) set engine mode to "LOAD" 381 * 2) write firmware data into program memory 382 */ 383 384 lp5523_load_engine_and_select_page(chip); 385 lp5523_update_program_memory(chip, fw->data, fw->size); 386 } 387 388 static ssize_t show_engine_mode(struct device *dev, 389 struct device_attribute *attr, 390 char *buf, int nr) 391 { 392 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 393 struct lp55xx_chip *chip = led->chip; 394 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; 395 396 switch (mode) { 397 case LP55XX_ENGINE_RUN: 398 return sprintf(buf, "run\n"); 399 case LP55XX_ENGINE_LOAD: 400 return sprintf(buf, "load\n"); 401 case LP55XX_ENGINE_DISABLED: 402 default: 403 return sprintf(buf, "disabled\n"); 404 } 405 } 406 show_mode(1) 407 show_mode(2) 408 show_mode(3) 409 410 static ssize_t store_engine_mode(struct device *dev, 411 struct device_attribute *attr, 412 const char *buf, size_t len, int nr) 413 { 414 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 415 struct lp55xx_chip *chip = led->chip; 416 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 417 418 mutex_lock(&chip->lock); 419 420 chip->engine_idx = nr; 421 422 if (!strncmp(buf, "run", 3)) { 423 lp5523_run_engine(chip, true); 424 engine->mode = LP55XX_ENGINE_RUN; 425 } else if (!strncmp(buf, "load", 4)) { 426 lp5523_stop_engine(chip); 427 lp5523_load_engine(chip); 428 engine->mode = LP55XX_ENGINE_LOAD; 429 } else if (!strncmp(buf, "disabled", 8)) { 430 lp5523_stop_engine(chip); 431 engine->mode = LP55XX_ENGINE_DISABLED; 432 } 433 434 mutex_unlock(&chip->lock); 435 436 return len; 437 } 438 store_mode(1) 439 store_mode(2) 440 store_mode(3) 441 442 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 443 { 444 u16 tmp_mux = 0; 445 int i; 446 447 len = min_t(int, len, LP5523_MAX_LEDS); 448 449 for (i = 0; i < len; i++) { 450 switch (buf[i]) { 451 case '1': 452 tmp_mux |= (1 << i); 453 break; 454 case '0': 455 break; 456 case '\n': 457 i = len; 458 break; 459 default: 460 return -1; 461 } 462 } 463 *mux = tmp_mux; 464 465 return 0; 466 } 467 468 static void lp5523_mux_to_array(u16 led_mux, char *array) 469 { 470 int i, pos = 0; 471 for (i = 0; i < LP5523_MAX_LEDS; i++) 472 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 473 474 array[pos] = '\0'; 475 } 476 477 static ssize_t show_engine_leds(struct device *dev, 478 struct device_attribute *attr, 479 char *buf, int nr) 480 { 481 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 482 struct lp55xx_chip *chip = led->chip; 483 char mux[LP5523_MAX_LEDS + 1]; 484 485 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 486 487 return sprintf(buf, "%s\n", mux); 488 } 489 show_leds(1) 490 show_leds(2) 491 show_leds(3) 492 493 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 494 { 495 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 496 int ret; 497 static const u8 mux_page[] = { 498 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 499 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 500 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 501 }; 502 503 lp5523_load_engine(chip); 504 505 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 506 if (ret) 507 return ret; 508 509 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8)); 510 if (ret) 511 return ret; 512 513 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 514 if (ret) 515 return ret; 516 517 engine->led_mux = mux; 518 return 0; 519 } 520 521 static ssize_t store_engine_leds(struct device *dev, 522 struct device_attribute *attr, 523 const char *buf, size_t len, int nr) 524 { 525 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 526 struct lp55xx_chip *chip = led->chip; 527 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 528 u16 mux = 0; 529 ssize_t ret; 530 531 if (lp5523_mux_parse(buf, &mux, len)) 532 return -EINVAL; 533 534 mutex_lock(&chip->lock); 535 536 chip->engine_idx = nr; 537 ret = -EINVAL; 538 539 if (engine->mode != LP55XX_ENGINE_LOAD) 540 goto leave; 541 542 if (lp5523_load_mux(chip, mux, nr)) 543 goto leave; 544 545 ret = len; 546 leave: 547 mutex_unlock(&chip->lock); 548 return ret; 549 } 550 store_leds(1) 551 store_leds(2) 552 store_leds(3) 553 554 static ssize_t store_engine_load(struct device *dev, 555 struct device_attribute *attr, 556 const char *buf, size_t len, int nr) 557 { 558 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 559 struct lp55xx_chip *chip = led->chip; 560 int ret; 561 562 mutex_lock(&chip->lock); 563 564 chip->engine_idx = nr; 565 lp5523_load_engine_and_select_page(chip); 566 ret = lp5523_update_program_memory(chip, buf, len); 567 568 mutex_unlock(&chip->lock); 569 570 return ret; 571 } 572 store_load(1) 573 store_load(2) 574 store_load(3) 575 576 static ssize_t lp5523_selftest(struct device *dev, 577 struct device_attribute *attr, 578 char *buf) 579 { 580 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 581 struct lp55xx_chip *chip = led->chip; 582 struct lp55xx_platform_data *pdata = chip->pdata; 583 int i, ret, pos = 0; 584 u8 status, adc, vdd; 585 586 mutex_lock(&chip->lock); 587 588 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 589 if (ret < 0) 590 goto fail; 591 592 /* Check that ext clock is really in use if requested */ 593 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 594 if ((status & LP5523_EXT_CLK_USED) == 0) 595 goto fail; 596 } 597 598 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 599 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 600 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 601 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 602 if (ret < 0) 603 goto fail; 604 605 if (!(status & LP5523_LEDTEST_DONE)) 606 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 607 608 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 609 if (ret < 0) 610 goto fail; 611 612 vdd--; /* There may be some fluctuation in measurement */ 613 614 for (i = 0; i < LP5523_MAX_LEDS; i++) { 615 /* Skip non-existing channels */ 616 if (pdata->led_config[i].led_current == 0) 617 continue; 618 619 /* Set default current */ 620 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 621 pdata->led_config[i].led_current); 622 623 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff); 624 /* let current stabilize 2 - 4ms before measurements start */ 625 usleep_range(2000, 4000); 626 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, 627 LP5523_EN_LEDTEST | i); 628 /* ADC conversion time is 2.7 ms typically */ 629 usleep_range(3000, 6000); 630 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 631 if (ret < 0) 632 goto fail; 633 634 if (!(status & LP5523_LEDTEST_DONE)) 635 usleep_range(3000, 6000);/* Was not ready. Wait. */ 636 637 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc); 638 if (ret < 0) 639 goto fail; 640 641 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 642 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 643 644 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00); 645 646 /* Restore current */ 647 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 648 led->led_current); 649 led++; 650 } 651 if (pos == 0) 652 pos = sprintf(buf, "OK\n"); 653 goto release_lock; 654 fail: 655 pos = sprintf(buf, "FAIL\n"); 656 657 release_lock: 658 mutex_unlock(&chip->lock); 659 660 return pos; 661 } 662 663 #define show_fader(nr) \ 664 static ssize_t show_master_fader##nr(struct device *dev, \ 665 struct device_attribute *attr, \ 666 char *buf) \ 667 { \ 668 return show_master_fader(dev, attr, buf, nr); \ 669 } 670 671 #define store_fader(nr) \ 672 static ssize_t store_master_fader##nr(struct device *dev, \ 673 struct device_attribute *attr, \ 674 const char *buf, size_t len) \ 675 { \ 676 return store_master_fader(dev, attr, buf, len, nr); \ 677 } 678 679 static ssize_t show_master_fader(struct device *dev, 680 struct device_attribute *attr, 681 char *buf, int nr) 682 { 683 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 684 struct lp55xx_chip *chip = led->chip; 685 int ret; 686 u8 val; 687 688 mutex_lock(&chip->lock); 689 ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val); 690 mutex_unlock(&chip->lock); 691 692 if (ret == 0) 693 ret = sprintf(buf, "%u\n", val); 694 695 return ret; 696 } 697 show_fader(1) 698 show_fader(2) 699 show_fader(3) 700 701 static ssize_t store_master_fader(struct device *dev, 702 struct device_attribute *attr, 703 const char *buf, size_t len, int nr) 704 { 705 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 706 struct lp55xx_chip *chip = led->chip; 707 int ret; 708 unsigned long val; 709 710 if (kstrtoul(buf, 0, &val)) 711 return -EINVAL; 712 713 if (val > 0xff) 714 return -EINVAL; 715 716 mutex_lock(&chip->lock); 717 ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, 718 (u8)val); 719 mutex_unlock(&chip->lock); 720 721 if (ret == 0) 722 ret = len; 723 724 return ret; 725 } 726 store_fader(1) 727 store_fader(2) 728 store_fader(3) 729 730 static ssize_t show_master_fader_leds(struct device *dev, 731 struct device_attribute *attr, 732 char *buf) 733 { 734 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 735 struct lp55xx_chip *chip = led->chip; 736 int i, ret, pos = 0; 737 u8 val; 738 739 mutex_lock(&chip->lock); 740 741 for (i = 0; i < LP5523_MAX_LEDS; i++) { 742 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val); 743 if (ret) 744 goto leave; 745 746 val = (val & LP5523_FADER_MAPPING_MASK) 747 >> LP5523_FADER_MAPPING_SHIFT; 748 if (val > 3) { 749 ret = -EINVAL; 750 goto leave; 751 } 752 buf[pos++] = val + '0'; 753 } 754 buf[pos++] = '\n'; 755 ret = pos; 756 leave: 757 mutex_unlock(&chip->lock); 758 return ret; 759 } 760 761 static ssize_t store_master_fader_leds(struct device *dev, 762 struct device_attribute *attr, 763 const char *buf, size_t len) 764 { 765 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 766 struct lp55xx_chip *chip = led->chip; 767 int i, n, ret; 768 u8 val; 769 770 n = min_t(int, len, LP5523_MAX_LEDS); 771 772 mutex_lock(&chip->lock); 773 774 for (i = 0; i < n; i++) { 775 if (buf[i] >= '0' && buf[i] <= '3') { 776 val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT; 777 ret = lp55xx_update_bits(chip, 778 LP5523_REG_LED_CTRL_BASE + i, 779 LP5523_FADER_MAPPING_MASK, 780 val); 781 if (ret) 782 goto leave; 783 } else { 784 ret = -EINVAL; 785 goto leave; 786 } 787 } 788 ret = len; 789 leave: 790 mutex_unlock(&chip->lock); 791 return ret; 792 } 793 794 static int lp5523_led_brightness(struct lp55xx_led *led) 795 { 796 struct lp55xx_chip *chip = led->chip; 797 int ret; 798 799 mutex_lock(&chip->lock); 800 ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 801 led->brightness); 802 mutex_unlock(&chip->lock); 803 return ret; 804 } 805 806 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 807 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 808 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 809 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 810 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 811 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 812 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 813 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 814 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 815 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 816 static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1, 817 store_master_fader1); 818 static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2, 819 store_master_fader2); 820 static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3, 821 store_master_fader3); 822 static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds, 823 store_master_fader_leds); 824 825 static struct attribute *lp5523_attributes[] = { 826 &dev_attr_engine1_mode.attr, 827 &dev_attr_engine2_mode.attr, 828 &dev_attr_engine3_mode.attr, 829 &dev_attr_engine1_load.attr, 830 &dev_attr_engine2_load.attr, 831 &dev_attr_engine3_load.attr, 832 &dev_attr_engine1_leds.attr, 833 &dev_attr_engine2_leds.attr, 834 &dev_attr_engine3_leds.attr, 835 &dev_attr_selftest.attr, 836 &dev_attr_master_fader1.attr, 837 &dev_attr_master_fader2.attr, 838 &dev_attr_master_fader3.attr, 839 &dev_attr_master_fader_leds.attr, 840 NULL, 841 }; 842 843 static const struct attribute_group lp5523_group = { 844 .attrs = lp5523_attributes, 845 }; 846 847 /* Chip specific configurations */ 848 static struct lp55xx_device_config lp5523_cfg = { 849 .reset = { 850 .addr = LP5523_REG_RESET, 851 .val = LP5523_RESET, 852 }, 853 .enable = { 854 .addr = LP5523_REG_ENABLE, 855 .val = LP5523_ENABLE, 856 }, 857 .max_channel = LP5523_MAX_LEDS, 858 .post_init_device = lp5523_post_init_device, 859 .brightness_fn = lp5523_led_brightness, 860 .set_led_current = lp5523_set_led_current, 861 .firmware_cb = lp5523_firmware_loaded, 862 .run_engine = lp5523_run_engine, 863 .dev_attr_group = &lp5523_group, 864 }; 865 866 static int lp5523_probe(struct i2c_client *client, 867 const struct i2c_device_id *id) 868 { 869 int ret; 870 struct lp55xx_chip *chip; 871 struct lp55xx_led *led; 872 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev); 873 struct device_node *np = client->dev.of_node; 874 875 if (!pdata) { 876 if (np) { 877 pdata = lp55xx_of_populate_pdata(&client->dev, np); 878 if (IS_ERR(pdata)) 879 return PTR_ERR(pdata); 880 } else { 881 dev_err(&client->dev, "no platform data\n"); 882 return -EINVAL; 883 } 884 } 885 886 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 887 if (!chip) 888 return -ENOMEM; 889 890 led = devm_kcalloc(&client->dev, 891 pdata->num_channels, sizeof(*led), GFP_KERNEL); 892 if (!led) 893 return -ENOMEM; 894 895 chip->cl = client; 896 chip->pdata = pdata; 897 chip->cfg = &lp5523_cfg; 898 899 mutex_init(&chip->lock); 900 901 i2c_set_clientdata(client, led); 902 903 ret = lp55xx_init_device(chip); 904 if (ret) 905 goto err_init; 906 907 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 908 909 ret = lp55xx_register_leds(led, chip); 910 if (ret) 911 goto err_register_leds; 912 913 ret = lp55xx_register_sysfs(chip); 914 if (ret) { 915 dev_err(&client->dev, "registering sysfs failed\n"); 916 goto err_register_sysfs; 917 } 918 919 return 0; 920 921 err_register_sysfs: 922 lp55xx_unregister_leds(led, chip); 923 err_register_leds: 924 lp55xx_deinit_device(chip); 925 err_init: 926 return ret; 927 } 928 929 static int lp5523_remove(struct i2c_client *client) 930 { 931 struct lp55xx_led *led = i2c_get_clientdata(client); 932 struct lp55xx_chip *chip = led->chip; 933 934 lp5523_stop_all_engines(chip); 935 lp55xx_unregister_sysfs(chip); 936 lp55xx_unregister_leds(led, chip); 937 lp55xx_deinit_device(chip); 938 939 return 0; 940 } 941 942 static const struct i2c_device_id lp5523_id[] = { 943 { "lp5523", LP5523 }, 944 { "lp55231", LP55231 }, 945 { } 946 }; 947 948 MODULE_DEVICE_TABLE(i2c, lp5523_id); 949 950 #ifdef CONFIG_OF 951 static const struct of_device_id of_lp5523_leds_match[] = { 952 { .compatible = "national,lp5523", }, 953 { .compatible = "ti,lp55231", }, 954 {}, 955 }; 956 957 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 958 #endif 959 960 static struct i2c_driver lp5523_driver = { 961 .driver = { 962 .name = "lp5523x", 963 .of_match_table = of_match_ptr(of_lp5523_leds_match), 964 }, 965 .probe = lp5523_probe, 966 .remove = lp5523_remove, 967 .id_table = lp5523_id, 968 }; 969 970 module_i2c_driver(lp5523_driver); 971 972 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 973 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 974 MODULE_DESCRIPTION("LP5523 LED engine"); 975 MODULE_LICENSE("GPL"); 976