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_CTRL_BASE 0x06 54 #define LP5523_REG_LED_PWM_BASE 0x16 55 #define LP5523_REG_LED_CURRENT_BASE 0x26 56 #define LP5523_REG_CONFIG 0x36 57 #define LP5523_REG_STATUS 0x3A 58 #define LP5523_REG_RESET 0x3D 59 #define LP5523_REG_LED_TEST_CTRL 0x41 60 #define LP5523_REG_LED_TEST_ADC 0x42 61 #define LP5523_REG_MASTER_FADER_BASE 0x48 62 #define LP5523_REG_CH1_PROG_START 0x4C 63 #define LP5523_REG_CH2_PROG_START 0x4D 64 #define LP5523_REG_CH3_PROG_START 0x4E 65 #define LP5523_REG_PROG_PAGE_SEL 0x4F 66 #define LP5523_REG_PROG_MEM 0x50 67 68 /* Bit description in registers */ 69 #define LP5523_ENABLE 0x40 70 #define LP5523_AUTO_INC 0x40 71 #define LP5523_PWR_SAVE 0x20 72 #define LP5523_PWM_PWR_SAVE 0x04 73 #define LP5523_CP_AUTO 0x18 74 #define LP5523_AUTO_CLK 0x02 75 76 #define LP5523_EN_LEDTEST 0x80 77 #define LP5523_LEDTEST_DONE 0x80 78 #define LP5523_RESET 0xFF 79 #define LP5523_ADC_SHORTCIRC_LIM 80 80 #define LP5523_EXT_CLK_USED 0x08 81 #define LP5523_ENG_STATUS_MASK 0x07 82 83 #define LP5523_FADER_MAPPING_MASK 0xC0 84 #define LP5523_FADER_MAPPING_SHIFT 6 85 86 /* Memory Page Selection */ 87 #define LP5523_PAGE_ENG1 0 88 #define LP5523_PAGE_ENG2 1 89 #define LP5523_PAGE_ENG3 2 90 #define LP5523_PAGE_MUX1 3 91 #define LP5523_PAGE_MUX2 4 92 #define LP5523_PAGE_MUX3 5 93 94 /* Program Memory Operations */ 95 #define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */ 96 #define LP5523_MODE_ENG2_M 0x0C 97 #define LP5523_MODE_ENG3_M 0x03 98 #define LP5523_LOAD_ENG1 0x10 99 #define LP5523_LOAD_ENG2 0x04 100 #define LP5523_LOAD_ENG3 0x01 101 102 #define LP5523_ENG1_IS_LOADING(mode) \ 103 ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1) 104 #define LP5523_ENG2_IS_LOADING(mode) \ 105 ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2) 106 #define LP5523_ENG3_IS_LOADING(mode) \ 107 ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3) 108 109 #define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */ 110 #define LP5523_EXEC_ENG2_M 0x0C 111 #define LP5523_EXEC_ENG3_M 0x03 112 #define LP5523_EXEC_M 0x3F 113 #define LP5523_RUN_ENG1 0x20 114 #define LP5523_RUN_ENG2 0x08 115 #define LP5523_RUN_ENG3 0x02 116 117 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) 118 119 enum lp5523_chip_id { 120 LP5523, 121 LP55231, 122 }; 123 124 static int lp5523_init_program_engine(struct lp55xx_chip *chip); 125 126 static inline void lp5523_wait_opmode_done(void) 127 { 128 usleep_range(1000, 2000); 129 } 130 131 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current) 132 { 133 led->led_current = led_current; 134 lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 135 led_current); 136 } 137 138 static int lp5523_post_init_device(struct lp55xx_chip *chip) 139 { 140 int ret; 141 142 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE); 143 if (ret) 144 return ret; 145 146 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 147 usleep_range(1000, 2000); 148 149 ret = lp55xx_write(chip, LP5523_REG_CONFIG, 150 LP5523_AUTO_INC | LP5523_PWR_SAVE | 151 LP5523_CP_AUTO | LP5523_AUTO_CLK | 152 LP5523_PWM_PWR_SAVE); 153 if (ret) 154 return ret; 155 156 /* turn on all leds */ 157 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 158 if (ret) 159 return ret; 160 161 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 162 if (ret) 163 return ret; 164 165 return lp5523_init_program_engine(chip); 166 } 167 168 static void lp5523_load_engine(struct lp55xx_chip *chip) 169 { 170 enum lp55xx_engine_index idx = chip->engine_idx; 171 static const u8 mask[] = { 172 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 173 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 174 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 175 }; 176 177 static const u8 val[] = { 178 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1, 179 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2, 180 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3, 181 }; 182 183 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]); 184 185 lp5523_wait_opmode_done(); 186 } 187 188 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip) 189 { 190 enum lp55xx_engine_index idx = chip->engine_idx; 191 static const u8 page_sel[] = { 192 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1, 193 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2, 194 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3, 195 }; 196 197 lp5523_load_engine(chip); 198 199 lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]); 200 } 201 202 static void lp5523_stop_all_engines(struct lp55xx_chip *chip) 203 { 204 lp55xx_write(chip, LP5523_REG_OP_MODE, 0); 205 lp5523_wait_opmode_done(); 206 } 207 208 static void lp5523_stop_engine(struct lp55xx_chip *chip) 209 { 210 enum lp55xx_engine_index idx = chip->engine_idx; 211 static const u8 mask[] = { 212 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M, 213 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M, 214 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M, 215 }; 216 217 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0); 218 219 lp5523_wait_opmode_done(); 220 } 221 222 static void lp5523_turn_off_channels(struct lp55xx_chip *chip) 223 { 224 int i; 225 226 for (i = 0; i < LP5523_MAX_LEDS; i++) 227 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0); 228 } 229 230 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start) 231 { 232 int ret; 233 u8 mode; 234 u8 exec; 235 236 /* stop engine */ 237 if (!start) { 238 lp5523_stop_engine(chip); 239 lp5523_turn_off_channels(chip); 240 return; 241 } 242 243 /* 244 * To run the engine, 245 * operation mode and enable register should updated at the same time 246 */ 247 248 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode); 249 if (ret) 250 return; 251 252 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec); 253 if (ret) 254 return; 255 256 /* change operation mode to RUN only when each engine is loading */ 257 if (LP5523_ENG1_IS_LOADING(mode)) { 258 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1; 259 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1; 260 } 261 262 if (LP5523_ENG2_IS_LOADING(mode)) { 263 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2; 264 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2; 265 } 266 267 if (LP5523_ENG3_IS_LOADING(mode)) { 268 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3; 269 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3; 270 } 271 272 lp55xx_write(chip, LP5523_REG_OP_MODE, mode); 273 lp5523_wait_opmode_done(); 274 275 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec); 276 } 277 278 static int lp5523_init_program_engine(struct lp55xx_chip *chip) 279 { 280 int i; 281 int j; 282 int ret; 283 u8 status; 284 /* one pattern per engine setting LED MUX start and stop addresses */ 285 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { 286 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 287 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 288 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 289 }; 290 291 /* hardcode 32 bytes of memory for each engine from program memory */ 292 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00); 293 if (ret) 294 return ret; 295 296 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10); 297 if (ret) 298 return ret; 299 300 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20); 301 if (ret) 302 return ret; 303 304 /* write LED MUX address space for each engine */ 305 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 306 chip->engine_idx = i; 307 lp5523_load_engine_and_select_page(chip); 308 309 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) { 310 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j, 311 pattern[i - 1][j]); 312 if (ret) 313 goto out; 314 } 315 } 316 317 lp5523_run_engine(chip, true); 318 319 /* Let the programs run for couple of ms and check the engine status */ 320 usleep_range(3000, 6000); 321 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 322 if (ret) 323 return ret; 324 status &= LP5523_ENG_STATUS_MASK; 325 326 if (status != LP5523_ENG_STATUS_MASK) { 327 dev_err(&chip->cl->dev, 328 "could not configure LED engine, status = 0x%.2x\n", 329 status); 330 ret = -1; 331 } 332 333 out: 334 lp5523_stop_all_engines(chip); 335 return ret; 336 } 337 338 static int lp5523_update_program_memory(struct lp55xx_chip *chip, 339 const u8 *data, size_t size) 340 { 341 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 342 unsigned cmd; 343 char c[3]; 344 int nrchars; 345 int ret; 346 int offset = 0; 347 int i = 0; 348 349 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) { 350 /* separate sscanfs because length is working only for %s */ 351 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 352 if (ret != 1) 353 goto err; 354 355 ret = sscanf(c, "%2x", &cmd); 356 if (ret != 1) 357 goto err; 358 359 pattern[i] = (u8)cmd; 360 offset += nrchars; 361 i++; 362 } 363 364 /* Each instruction is 16bit long. Check that length is even */ 365 if (i % 2) 366 goto err; 367 368 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { 369 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); 370 if (ret) 371 return -EINVAL; 372 } 373 374 return size; 375 376 err: 377 dev_err(&chip->cl->dev, "wrong pattern format\n"); 378 return -EINVAL; 379 } 380 381 static void lp5523_firmware_loaded(struct lp55xx_chip *chip) 382 { 383 const struct firmware *fw = chip->fw; 384 385 if (fw->size > LP5523_PROGRAM_LENGTH) { 386 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 387 fw->size); 388 return; 389 } 390 391 /* 392 * Program memory sequence 393 * 1) set engine mode to "LOAD" 394 * 2) write firmware data into program memory 395 */ 396 397 lp5523_load_engine_and_select_page(chip); 398 lp5523_update_program_memory(chip, fw->data, fw->size); 399 } 400 401 static ssize_t show_engine_mode(struct device *dev, 402 struct device_attribute *attr, 403 char *buf, int nr) 404 { 405 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 406 struct lp55xx_chip *chip = led->chip; 407 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; 408 409 switch (mode) { 410 case LP55XX_ENGINE_RUN: 411 return sprintf(buf, "run\n"); 412 case LP55XX_ENGINE_LOAD: 413 return sprintf(buf, "load\n"); 414 case LP55XX_ENGINE_DISABLED: 415 default: 416 return sprintf(buf, "disabled\n"); 417 } 418 } 419 show_mode(1) 420 show_mode(2) 421 show_mode(3) 422 423 static ssize_t store_engine_mode(struct device *dev, 424 struct device_attribute *attr, 425 const char *buf, size_t len, int nr) 426 { 427 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 428 struct lp55xx_chip *chip = led->chip; 429 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 430 431 mutex_lock(&chip->lock); 432 433 chip->engine_idx = nr; 434 435 if (!strncmp(buf, "run", 3)) { 436 lp5523_run_engine(chip, true); 437 engine->mode = LP55XX_ENGINE_RUN; 438 } else if (!strncmp(buf, "load", 4)) { 439 lp5523_stop_engine(chip); 440 lp5523_load_engine(chip); 441 engine->mode = LP55XX_ENGINE_LOAD; 442 } else if (!strncmp(buf, "disabled", 8)) { 443 lp5523_stop_engine(chip); 444 engine->mode = LP55XX_ENGINE_DISABLED; 445 } 446 447 mutex_unlock(&chip->lock); 448 449 return len; 450 } 451 store_mode(1) 452 store_mode(2) 453 store_mode(3) 454 455 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 456 { 457 u16 tmp_mux = 0; 458 int i; 459 460 len = min_t(int, len, LP5523_MAX_LEDS); 461 462 for (i = 0; i < len; i++) { 463 switch (buf[i]) { 464 case '1': 465 tmp_mux |= (1 << i); 466 break; 467 case '0': 468 break; 469 case '\n': 470 i = len; 471 break; 472 default: 473 return -1; 474 } 475 } 476 *mux = tmp_mux; 477 478 return 0; 479 } 480 481 static void lp5523_mux_to_array(u16 led_mux, char *array) 482 { 483 int i, pos = 0; 484 for (i = 0; i < LP5523_MAX_LEDS; i++) 485 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 486 487 array[pos] = '\0'; 488 } 489 490 static ssize_t show_engine_leds(struct device *dev, 491 struct device_attribute *attr, 492 char *buf, int nr) 493 { 494 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 495 struct lp55xx_chip *chip = led->chip; 496 char mux[LP5523_MAX_LEDS + 1]; 497 498 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 499 500 return sprintf(buf, "%s\n", mux); 501 } 502 show_leds(1) 503 show_leds(2) 504 show_leds(3) 505 506 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 507 { 508 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 509 int ret; 510 static const u8 mux_page[] = { 511 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 512 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 513 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 514 }; 515 516 lp5523_load_engine(chip); 517 518 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 519 if (ret) 520 return ret; 521 522 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8)); 523 if (ret) 524 return ret; 525 526 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 527 if (ret) 528 return ret; 529 530 engine->led_mux = mux; 531 return 0; 532 } 533 534 static ssize_t store_engine_leds(struct device *dev, 535 struct device_attribute *attr, 536 const char *buf, size_t len, int nr) 537 { 538 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 539 struct lp55xx_chip *chip = led->chip; 540 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 541 u16 mux = 0; 542 ssize_t ret; 543 544 if (lp5523_mux_parse(buf, &mux, len)) 545 return -EINVAL; 546 547 mutex_lock(&chip->lock); 548 549 chip->engine_idx = nr; 550 ret = -EINVAL; 551 552 if (engine->mode != LP55XX_ENGINE_LOAD) 553 goto leave; 554 555 if (lp5523_load_mux(chip, mux, nr)) 556 goto leave; 557 558 ret = len; 559 leave: 560 mutex_unlock(&chip->lock); 561 return ret; 562 } 563 store_leds(1) 564 store_leds(2) 565 store_leds(3) 566 567 static ssize_t store_engine_load(struct device *dev, 568 struct device_attribute *attr, 569 const char *buf, size_t len, int nr) 570 { 571 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 572 struct lp55xx_chip *chip = led->chip; 573 int ret; 574 575 mutex_lock(&chip->lock); 576 577 chip->engine_idx = nr; 578 lp5523_load_engine_and_select_page(chip); 579 ret = lp5523_update_program_memory(chip, buf, len); 580 581 mutex_unlock(&chip->lock); 582 583 return ret; 584 } 585 store_load(1) 586 store_load(2) 587 store_load(3) 588 589 static ssize_t lp5523_selftest(struct device *dev, 590 struct device_attribute *attr, 591 char *buf) 592 { 593 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 594 struct lp55xx_chip *chip = led->chip; 595 struct lp55xx_platform_data *pdata = chip->pdata; 596 int i, ret, pos = 0; 597 u8 status, adc, vdd; 598 599 mutex_lock(&chip->lock); 600 601 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 602 if (ret < 0) 603 goto fail; 604 605 /* Check that ext clock is really in use if requested */ 606 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 607 if ((status & LP5523_EXT_CLK_USED) == 0) 608 goto fail; 609 } 610 611 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 612 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 613 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 614 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 615 if (ret < 0) 616 goto fail; 617 618 if (!(status & LP5523_LEDTEST_DONE)) 619 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 620 621 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 622 if (ret < 0) 623 goto fail; 624 625 vdd--; /* There may be some fluctuation in measurement */ 626 627 for (i = 0; i < LP5523_MAX_LEDS; i++) { 628 /* Skip non-existing channels */ 629 if (pdata->led_config[i].led_current == 0) 630 continue; 631 632 /* Set default current */ 633 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 634 pdata->led_config[i].led_current); 635 636 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff); 637 /* let current stabilize 2 - 4ms before measurements start */ 638 usleep_range(2000, 4000); 639 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, 640 LP5523_EN_LEDTEST | i); 641 /* ADC conversion time is 2.7 ms typically */ 642 usleep_range(3000, 6000); 643 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 644 if (ret < 0) 645 goto fail; 646 647 if (!(status & LP5523_LEDTEST_DONE)) 648 usleep_range(3000, 6000);/* Was not ready. Wait. */ 649 650 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc); 651 if (ret < 0) 652 goto fail; 653 654 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 655 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 656 657 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00); 658 659 /* Restore current */ 660 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 661 led->led_current); 662 led++; 663 } 664 if (pos == 0) 665 pos = sprintf(buf, "OK\n"); 666 goto release_lock; 667 fail: 668 pos = sprintf(buf, "FAIL\n"); 669 670 release_lock: 671 mutex_unlock(&chip->lock); 672 673 return pos; 674 } 675 676 #define show_fader(nr) \ 677 static ssize_t show_master_fader##nr(struct device *dev, \ 678 struct device_attribute *attr, \ 679 char *buf) \ 680 { \ 681 return show_master_fader(dev, attr, buf, nr); \ 682 } 683 684 #define store_fader(nr) \ 685 static ssize_t store_master_fader##nr(struct device *dev, \ 686 struct device_attribute *attr, \ 687 const char *buf, size_t len) \ 688 { \ 689 return store_master_fader(dev, attr, buf, len, nr); \ 690 } 691 692 static ssize_t show_master_fader(struct device *dev, 693 struct device_attribute *attr, 694 char *buf, int nr) 695 { 696 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 697 struct lp55xx_chip *chip = led->chip; 698 int ret; 699 u8 val; 700 701 mutex_lock(&chip->lock); 702 ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val); 703 mutex_unlock(&chip->lock); 704 705 if (ret == 0) 706 ret = sprintf(buf, "%u\n", val); 707 708 return ret; 709 } 710 show_fader(1) 711 show_fader(2) 712 show_fader(3) 713 714 static ssize_t store_master_fader(struct device *dev, 715 struct device_attribute *attr, 716 const char *buf, size_t len, int nr) 717 { 718 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 719 struct lp55xx_chip *chip = led->chip; 720 int ret; 721 unsigned long val; 722 723 if (kstrtoul(buf, 0, &val)) 724 return -EINVAL; 725 726 if (val > 0xff) 727 return -EINVAL; 728 729 mutex_lock(&chip->lock); 730 ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, 731 (u8)val); 732 mutex_unlock(&chip->lock); 733 734 if (ret == 0) 735 ret = len; 736 737 return ret; 738 } 739 store_fader(1) 740 store_fader(2) 741 store_fader(3) 742 743 static ssize_t show_master_fader_leds(struct device *dev, 744 struct device_attribute *attr, 745 char *buf) 746 { 747 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 748 struct lp55xx_chip *chip = led->chip; 749 int i, ret, pos = 0; 750 u8 val; 751 752 mutex_lock(&chip->lock); 753 754 for (i = 0; i < LP5523_MAX_LEDS; i++) { 755 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val); 756 if (ret) 757 goto leave; 758 759 val = (val & LP5523_FADER_MAPPING_MASK) 760 >> LP5523_FADER_MAPPING_SHIFT; 761 if (val > 3) { 762 ret = -EINVAL; 763 goto leave; 764 } 765 buf[pos++] = val + '0'; 766 } 767 buf[pos++] = '\n'; 768 ret = pos; 769 leave: 770 mutex_unlock(&chip->lock); 771 return ret; 772 } 773 774 static ssize_t store_master_fader_leds(struct device *dev, 775 struct device_attribute *attr, 776 const char *buf, size_t len) 777 { 778 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 779 struct lp55xx_chip *chip = led->chip; 780 int i, n, ret; 781 u8 val; 782 783 n = min_t(int, len, LP5523_MAX_LEDS); 784 785 mutex_lock(&chip->lock); 786 787 for (i = 0; i < n; i++) { 788 if (buf[i] >= '0' && buf[i] <= '3') { 789 val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT; 790 ret = lp55xx_update_bits(chip, 791 LP5523_REG_LED_CTRL_BASE + i, 792 LP5523_FADER_MAPPING_MASK, 793 val); 794 if (ret) 795 goto leave; 796 } else { 797 ret = -EINVAL; 798 goto leave; 799 } 800 } 801 ret = len; 802 leave: 803 mutex_unlock(&chip->lock); 804 return ret; 805 } 806 807 static int lp5523_led_brightness(struct lp55xx_led *led) 808 { 809 struct lp55xx_chip *chip = led->chip; 810 int ret; 811 812 mutex_lock(&chip->lock); 813 ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 814 led->brightness); 815 mutex_unlock(&chip->lock); 816 return ret; 817 } 818 819 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 820 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 821 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 822 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 823 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 824 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 825 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 826 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 827 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 828 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 829 static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1, 830 store_master_fader1); 831 static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2, 832 store_master_fader2); 833 static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3, 834 store_master_fader3); 835 static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds, 836 store_master_fader_leds); 837 838 static struct attribute *lp5523_attributes[] = { 839 &dev_attr_engine1_mode.attr, 840 &dev_attr_engine2_mode.attr, 841 &dev_attr_engine3_mode.attr, 842 &dev_attr_engine1_load.attr, 843 &dev_attr_engine2_load.attr, 844 &dev_attr_engine3_load.attr, 845 &dev_attr_engine1_leds.attr, 846 &dev_attr_engine2_leds.attr, 847 &dev_attr_engine3_leds.attr, 848 &dev_attr_selftest.attr, 849 &dev_attr_master_fader1.attr, 850 &dev_attr_master_fader2.attr, 851 &dev_attr_master_fader3.attr, 852 &dev_attr_master_fader_leds.attr, 853 NULL, 854 }; 855 856 static const struct attribute_group lp5523_group = { 857 .attrs = lp5523_attributes, 858 }; 859 860 /* Chip specific configurations */ 861 static struct lp55xx_device_config lp5523_cfg = { 862 .reset = { 863 .addr = LP5523_REG_RESET, 864 .val = LP5523_RESET, 865 }, 866 .enable = { 867 .addr = LP5523_REG_ENABLE, 868 .val = LP5523_ENABLE, 869 }, 870 .max_channel = LP5523_MAX_LEDS, 871 .post_init_device = lp5523_post_init_device, 872 .brightness_fn = lp5523_led_brightness, 873 .set_led_current = lp5523_set_led_current, 874 .firmware_cb = lp5523_firmware_loaded, 875 .run_engine = lp5523_run_engine, 876 .dev_attr_group = &lp5523_group, 877 }; 878 879 static int lp5523_probe(struct i2c_client *client, 880 const struct i2c_device_id *id) 881 { 882 int ret; 883 struct lp55xx_chip *chip; 884 struct lp55xx_led *led; 885 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev); 886 struct device_node *np = client->dev.of_node; 887 888 if (!pdata) { 889 if (np) { 890 pdata = lp55xx_of_populate_pdata(&client->dev, np); 891 if (IS_ERR(pdata)) 892 return PTR_ERR(pdata); 893 } else { 894 dev_err(&client->dev, "no platform data\n"); 895 return -EINVAL; 896 } 897 } 898 899 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 900 if (!chip) 901 return -ENOMEM; 902 903 led = devm_kcalloc(&client->dev, 904 pdata->num_channels, sizeof(*led), GFP_KERNEL); 905 if (!led) 906 return -ENOMEM; 907 908 chip->cl = client; 909 chip->pdata = pdata; 910 chip->cfg = &lp5523_cfg; 911 912 mutex_init(&chip->lock); 913 914 i2c_set_clientdata(client, led); 915 916 ret = lp55xx_init_device(chip); 917 if (ret) 918 goto err_init; 919 920 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 921 922 ret = lp55xx_register_leds(led, chip); 923 if (ret) 924 goto err_register_leds; 925 926 ret = lp55xx_register_sysfs(chip); 927 if (ret) { 928 dev_err(&client->dev, "registering sysfs failed\n"); 929 goto err_register_sysfs; 930 } 931 932 return 0; 933 934 err_register_sysfs: 935 lp55xx_unregister_leds(led, chip); 936 err_register_leds: 937 lp55xx_deinit_device(chip); 938 err_init: 939 return ret; 940 } 941 942 static int lp5523_remove(struct i2c_client *client) 943 { 944 struct lp55xx_led *led = i2c_get_clientdata(client); 945 struct lp55xx_chip *chip = led->chip; 946 947 lp5523_stop_all_engines(chip); 948 lp55xx_unregister_sysfs(chip); 949 lp55xx_unregister_leds(led, chip); 950 lp55xx_deinit_device(chip); 951 952 return 0; 953 } 954 955 static const struct i2c_device_id lp5523_id[] = { 956 { "lp5523", LP5523 }, 957 { "lp55231", LP55231 }, 958 { } 959 }; 960 961 MODULE_DEVICE_TABLE(i2c, lp5523_id); 962 963 #ifdef CONFIG_OF 964 static const struct of_device_id of_lp5523_leds_match[] = { 965 { .compatible = "national,lp5523", }, 966 { .compatible = "ti,lp55231", }, 967 {}, 968 }; 969 970 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 971 #endif 972 973 static struct i2c_driver lp5523_driver = { 974 .driver = { 975 .name = "lp5523x", 976 .of_match_table = of_match_ptr(of_lp5523_leds_match), 977 }, 978 .probe = lp5523_probe, 979 .remove = lp5523_remove, 980 .id_table = lp5523_id, 981 }; 982 983 module_i2c_driver(lp5523_driver); 984 985 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 986 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 987 MODULE_DESCRIPTION("LP5523 LED engine"); 988 MODULE_LICENSE("GPL"); 989