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 goto out; 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 int 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; 471 472 for (i = 0; i < LP5523_MAX_LEDS; i++) 473 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 474 475 array[pos] = '\0'; 476 } 477 478 static ssize_t show_engine_leds(struct device *dev, 479 struct device_attribute *attr, 480 char *buf, int nr) 481 { 482 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 483 struct lp55xx_chip *chip = led->chip; 484 char mux[LP5523_MAX_LEDS + 1]; 485 486 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 487 488 return sprintf(buf, "%s\n", mux); 489 } 490 show_leds(1) 491 show_leds(2) 492 show_leds(3) 493 494 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 495 { 496 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 497 int ret; 498 static const u8 mux_page[] = { 499 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 500 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 501 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 502 }; 503 504 lp5523_load_engine(chip); 505 506 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 507 if (ret) 508 return ret; 509 510 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM, (u8)(mux >> 8)); 511 if (ret) 512 return ret; 513 514 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 515 if (ret) 516 return ret; 517 518 engine->led_mux = mux; 519 return 0; 520 } 521 522 static ssize_t store_engine_leds(struct device *dev, 523 struct device_attribute *attr, 524 const char *buf, size_t len, int nr) 525 { 526 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 527 struct lp55xx_chip *chip = led->chip; 528 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 529 u16 mux = 0; 530 ssize_t ret; 531 532 if (lp5523_mux_parse(buf, &mux, len)) 533 return -EINVAL; 534 535 mutex_lock(&chip->lock); 536 537 chip->engine_idx = nr; 538 ret = -EINVAL; 539 540 if (engine->mode != LP55XX_ENGINE_LOAD) 541 goto leave; 542 543 if (lp5523_load_mux(chip, mux, nr)) 544 goto leave; 545 546 ret = len; 547 leave: 548 mutex_unlock(&chip->lock); 549 return ret; 550 } 551 store_leds(1) 552 store_leds(2) 553 store_leds(3) 554 555 static ssize_t store_engine_load(struct device *dev, 556 struct device_attribute *attr, 557 const char *buf, size_t len, int nr) 558 { 559 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 560 struct lp55xx_chip *chip = led->chip; 561 int ret; 562 563 mutex_lock(&chip->lock); 564 565 chip->engine_idx = nr; 566 lp5523_load_engine_and_select_page(chip); 567 ret = lp5523_update_program_memory(chip, buf, len); 568 569 mutex_unlock(&chip->lock); 570 571 return ret; 572 } 573 store_load(1) 574 store_load(2) 575 store_load(3) 576 577 static ssize_t lp5523_selftest(struct device *dev, 578 struct device_attribute *attr, 579 char *buf) 580 { 581 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 582 struct lp55xx_chip *chip = led->chip; 583 struct lp55xx_platform_data *pdata = chip->pdata; 584 int i, ret, pos = 0; 585 u8 status, adc, vdd; 586 587 mutex_lock(&chip->lock); 588 589 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 590 if (ret < 0) 591 goto fail; 592 593 /* Check that ext clock is really in use if requested */ 594 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 595 if ((status & LP5523_EXT_CLK_USED) == 0) 596 goto fail; 597 } 598 599 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 600 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 601 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 602 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 603 if (ret < 0) 604 goto fail; 605 606 if (!(status & LP5523_LEDTEST_DONE)) 607 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 608 609 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 610 if (ret < 0) 611 goto fail; 612 613 vdd--; /* There may be some fluctuation in measurement */ 614 615 for (i = 0; i < LP5523_MAX_LEDS; i++) { 616 /* Skip non-existing channels */ 617 if (pdata->led_config[i].led_current == 0) 618 continue; 619 620 /* Set default current */ 621 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 622 pdata->led_config[i].led_current); 623 624 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff); 625 /* let current stabilize 2 - 4ms before measurements start */ 626 usleep_range(2000, 4000); 627 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, 628 LP5523_EN_LEDTEST | i); 629 /* ADC conversion time is 2.7 ms typically */ 630 usleep_range(3000, 6000); 631 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 632 if (ret < 0) 633 goto fail; 634 635 if (!(status & LP5523_LEDTEST_DONE)) 636 usleep_range(3000, 6000);/* Was not ready. Wait. */ 637 638 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc); 639 if (ret < 0) 640 goto fail; 641 642 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 643 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 644 645 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00); 646 647 /* Restore current */ 648 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 649 led->led_current); 650 led++; 651 } 652 if (pos == 0) 653 pos = sprintf(buf, "OK\n"); 654 goto release_lock; 655 fail: 656 pos = sprintf(buf, "FAIL\n"); 657 658 release_lock: 659 mutex_unlock(&chip->lock); 660 661 return pos; 662 } 663 664 #define show_fader(nr) \ 665 static ssize_t show_master_fader##nr(struct device *dev, \ 666 struct device_attribute *attr, \ 667 char *buf) \ 668 { \ 669 return show_master_fader(dev, attr, buf, nr); \ 670 } 671 672 #define store_fader(nr) \ 673 static ssize_t store_master_fader##nr(struct device *dev, \ 674 struct device_attribute *attr, \ 675 const char *buf, size_t len) \ 676 { \ 677 return store_master_fader(dev, attr, buf, len, nr); \ 678 } 679 680 static ssize_t show_master_fader(struct device *dev, 681 struct device_attribute *attr, 682 char *buf, int nr) 683 { 684 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 685 struct lp55xx_chip *chip = led->chip; 686 int ret; 687 u8 val; 688 689 mutex_lock(&chip->lock); 690 ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val); 691 mutex_unlock(&chip->lock); 692 693 if (ret == 0) 694 ret = sprintf(buf, "%u\n", val); 695 696 return ret; 697 } 698 show_fader(1) 699 show_fader(2) 700 show_fader(3) 701 702 static ssize_t store_master_fader(struct device *dev, 703 struct device_attribute *attr, 704 const char *buf, size_t len, int nr) 705 { 706 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 707 struct lp55xx_chip *chip = led->chip; 708 int ret; 709 unsigned long val; 710 711 if (kstrtoul(buf, 0, &val)) 712 return -EINVAL; 713 714 if (val > 0xff) 715 return -EINVAL; 716 717 mutex_lock(&chip->lock); 718 ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, 719 (u8)val); 720 mutex_unlock(&chip->lock); 721 722 if (ret == 0) 723 ret = len; 724 725 return ret; 726 } 727 store_fader(1) 728 store_fader(2) 729 store_fader(3) 730 731 static ssize_t show_master_fader_leds(struct device *dev, 732 struct device_attribute *attr, 733 char *buf) 734 { 735 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 736 struct lp55xx_chip *chip = led->chip; 737 int i, ret, pos = 0; 738 u8 val; 739 740 mutex_lock(&chip->lock); 741 742 for (i = 0; i < LP5523_MAX_LEDS; i++) { 743 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val); 744 if (ret) 745 goto leave; 746 747 val = (val & LP5523_FADER_MAPPING_MASK) 748 >> LP5523_FADER_MAPPING_SHIFT; 749 if (val > 3) { 750 ret = -EINVAL; 751 goto leave; 752 } 753 buf[pos++] = val + '0'; 754 } 755 buf[pos++] = '\n'; 756 ret = pos; 757 leave: 758 mutex_unlock(&chip->lock); 759 return ret; 760 } 761 762 static ssize_t store_master_fader_leds(struct device *dev, 763 struct device_attribute *attr, 764 const char *buf, size_t len) 765 { 766 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 767 struct lp55xx_chip *chip = led->chip; 768 int i, n, ret; 769 u8 val; 770 771 n = min_t(int, len, LP5523_MAX_LEDS); 772 773 mutex_lock(&chip->lock); 774 775 for (i = 0; i < n; i++) { 776 if (buf[i] >= '0' && buf[i] <= '3') { 777 val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT; 778 ret = lp55xx_update_bits(chip, 779 LP5523_REG_LED_CTRL_BASE + i, 780 LP5523_FADER_MAPPING_MASK, 781 val); 782 if (ret) 783 goto leave; 784 } else { 785 ret = -EINVAL; 786 goto leave; 787 } 788 } 789 ret = len; 790 leave: 791 mutex_unlock(&chip->lock); 792 return ret; 793 } 794 795 static int lp5523_multicolor_brightness(struct lp55xx_led *led) 796 { 797 struct lp55xx_chip *chip = led->chip; 798 int ret; 799 int i; 800 801 mutex_lock(&chip->lock); 802 for (i = 0; i < led->mc_cdev.num_colors; i++) { 803 ret = lp55xx_write(chip, 804 LP5523_REG_LED_PWM_BASE + 805 led->mc_cdev.subled_info[i].channel, 806 led->mc_cdev.subled_info[i].brightness); 807 if (ret) 808 break; 809 } 810 mutex_unlock(&chip->lock); 811 return ret; 812 } 813 814 static int lp5523_led_brightness(struct lp55xx_led *led) 815 { 816 struct lp55xx_chip *chip = led->chip; 817 int ret; 818 819 mutex_lock(&chip->lock); 820 ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 821 led->brightness); 822 mutex_unlock(&chip->lock); 823 return ret; 824 } 825 826 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 827 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 828 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 829 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 830 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 831 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 832 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 833 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 834 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 835 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 836 static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1, 837 store_master_fader1); 838 static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2, 839 store_master_fader2); 840 static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3, 841 store_master_fader3); 842 static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds, 843 store_master_fader_leds); 844 845 static struct attribute *lp5523_attributes[] = { 846 &dev_attr_engine1_mode.attr, 847 &dev_attr_engine2_mode.attr, 848 &dev_attr_engine3_mode.attr, 849 &dev_attr_engine1_load.attr, 850 &dev_attr_engine2_load.attr, 851 &dev_attr_engine3_load.attr, 852 &dev_attr_engine1_leds.attr, 853 &dev_attr_engine2_leds.attr, 854 &dev_attr_engine3_leds.attr, 855 &dev_attr_selftest.attr, 856 &dev_attr_master_fader1.attr, 857 &dev_attr_master_fader2.attr, 858 &dev_attr_master_fader3.attr, 859 &dev_attr_master_fader_leds.attr, 860 NULL, 861 }; 862 863 static const struct attribute_group lp5523_group = { 864 .attrs = lp5523_attributes, 865 }; 866 867 /* Chip specific configurations */ 868 static struct lp55xx_device_config lp5523_cfg = { 869 .reset = { 870 .addr = LP5523_REG_RESET, 871 .val = LP5523_RESET, 872 }, 873 .enable = { 874 .addr = LP5523_REG_ENABLE, 875 .val = LP5523_ENABLE, 876 }, 877 .max_channel = LP5523_MAX_LEDS, 878 .post_init_device = lp5523_post_init_device, 879 .brightness_fn = lp5523_led_brightness, 880 .multicolor_brightness_fn = lp5523_multicolor_brightness, 881 .set_led_current = lp5523_set_led_current, 882 .firmware_cb = lp5523_firmware_loaded, 883 .run_engine = lp5523_run_engine, 884 .dev_attr_group = &lp5523_group, 885 }; 886 887 static int lp5523_probe(struct i2c_client *client, 888 const struct i2c_device_id *id) 889 { 890 int ret; 891 struct lp55xx_chip *chip; 892 struct lp55xx_led *led; 893 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev); 894 struct device_node *np = dev_of_node(&client->dev); 895 896 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 897 if (!chip) 898 return -ENOMEM; 899 900 chip->cfg = &lp5523_cfg; 901 902 if (!pdata) { 903 if (np) { 904 pdata = lp55xx_of_populate_pdata(&client->dev, np, 905 chip); 906 if (IS_ERR(pdata)) 907 return PTR_ERR(pdata); 908 } else { 909 dev_err(&client->dev, "no platform data\n"); 910 return -EINVAL; 911 } 912 } 913 914 led = devm_kcalloc(&client->dev, 915 pdata->num_channels, sizeof(*led), GFP_KERNEL); 916 if (!led) 917 return -ENOMEM; 918 919 chip->cl = client; 920 chip->pdata = pdata; 921 922 mutex_init(&chip->lock); 923 924 i2c_set_clientdata(client, led); 925 926 ret = lp55xx_init_device(chip); 927 if (ret) 928 goto err_init; 929 930 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 931 932 ret = lp55xx_register_leds(led, chip); 933 if (ret) 934 goto err_out; 935 936 ret = lp55xx_register_sysfs(chip); 937 if (ret) { 938 dev_err(&client->dev, "registering sysfs failed\n"); 939 goto err_out; 940 } 941 942 return 0; 943 944 err_out: 945 lp55xx_deinit_device(chip); 946 err_init: 947 return ret; 948 } 949 950 static int lp5523_remove(struct i2c_client *client) 951 { 952 struct lp55xx_led *led = i2c_get_clientdata(client); 953 struct lp55xx_chip *chip = led->chip; 954 955 lp5523_stop_all_engines(chip); 956 lp55xx_unregister_sysfs(chip); 957 lp55xx_deinit_device(chip); 958 959 return 0; 960 } 961 962 static const struct i2c_device_id lp5523_id[] = { 963 { "lp5523", LP5523 }, 964 { "lp55231", LP55231 }, 965 { } 966 }; 967 968 MODULE_DEVICE_TABLE(i2c, lp5523_id); 969 970 #ifdef CONFIG_OF 971 static const struct of_device_id of_lp5523_leds_match[] = { 972 { .compatible = "national,lp5523", }, 973 { .compatible = "ti,lp55231", }, 974 {}, 975 }; 976 977 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 978 #endif 979 980 static struct i2c_driver lp5523_driver = { 981 .driver = { 982 .name = "lp5523x", 983 .of_match_table = of_match_ptr(of_lp5523_leds_match), 984 }, 985 .probe = lp5523_probe, 986 .remove = lp5523_remove, 987 .id_table = lp5523_id, 988 }; 989 990 module_i2c_driver(lp5523_driver); 991 992 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 993 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 994 MODULE_DESCRIPTION("LP5523 LED engine"); 995 MODULE_LICENSE("GPL"); 996