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 lp55xx_read(chip, LP5523_REG_STATUS, &status); 322 status &= LP5523_ENG_STATUS_MASK; 323 324 if (status != LP5523_ENG_STATUS_MASK) { 325 dev_err(&chip->cl->dev, 326 "could not configure LED engine, status = 0x%.2x\n", 327 status); 328 ret = -1; 329 } 330 331 out: 332 lp5523_stop_all_engines(chip); 333 return ret; 334 } 335 336 static int lp5523_update_program_memory(struct lp55xx_chip *chip, 337 const u8 *data, size_t size) 338 { 339 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 340 unsigned cmd; 341 char c[3]; 342 int nrchars; 343 int ret; 344 int offset = 0; 345 int i = 0; 346 347 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) { 348 /* separate sscanfs because length is working only for %s */ 349 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 350 if (ret != 1) 351 goto err; 352 353 ret = sscanf(c, "%2x", &cmd); 354 if (ret != 1) 355 goto err; 356 357 pattern[i] = (u8)cmd; 358 offset += nrchars; 359 i++; 360 } 361 362 /* Each instruction is 16bit long. Check that length is even */ 363 if (i % 2) 364 goto err; 365 366 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { 367 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); 368 if (ret) 369 return -EINVAL; 370 } 371 372 return size; 373 374 err: 375 dev_err(&chip->cl->dev, "wrong pattern format\n"); 376 return -EINVAL; 377 } 378 379 static void lp5523_firmware_loaded(struct lp55xx_chip *chip) 380 { 381 const struct firmware *fw = chip->fw; 382 383 if (fw->size > LP5523_PROGRAM_LENGTH) { 384 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 385 fw->size); 386 return; 387 } 388 389 /* 390 * Program memory sequence 391 * 1) set engine mode to "LOAD" 392 * 2) write firmware data into program memory 393 */ 394 395 lp5523_load_engine_and_select_page(chip); 396 lp5523_update_program_memory(chip, fw->data, fw->size); 397 } 398 399 static ssize_t show_engine_mode(struct device *dev, 400 struct device_attribute *attr, 401 char *buf, int nr) 402 { 403 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 404 struct lp55xx_chip *chip = led->chip; 405 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; 406 407 switch (mode) { 408 case LP55XX_ENGINE_RUN: 409 return sprintf(buf, "run\n"); 410 case LP55XX_ENGINE_LOAD: 411 return sprintf(buf, "load\n"); 412 case LP55XX_ENGINE_DISABLED: 413 default: 414 return sprintf(buf, "disabled\n"); 415 } 416 } 417 show_mode(1) 418 show_mode(2) 419 show_mode(3) 420 421 static ssize_t store_engine_mode(struct device *dev, 422 struct device_attribute *attr, 423 const char *buf, size_t len, int nr) 424 { 425 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 426 struct lp55xx_chip *chip = led->chip; 427 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 428 429 mutex_lock(&chip->lock); 430 431 chip->engine_idx = nr; 432 433 if (!strncmp(buf, "run", 3)) { 434 lp5523_run_engine(chip, true); 435 engine->mode = LP55XX_ENGINE_RUN; 436 } else if (!strncmp(buf, "load", 4)) { 437 lp5523_stop_engine(chip); 438 lp5523_load_engine(chip); 439 engine->mode = LP55XX_ENGINE_LOAD; 440 } else if (!strncmp(buf, "disabled", 8)) { 441 lp5523_stop_engine(chip); 442 engine->mode = LP55XX_ENGINE_DISABLED; 443 } 444 445 mutex_unlock(&chip->lock); 446 447 return len; 448 } 449 store_mode(1) 450 store_mode(2) 451 store_mode(3) 452 453 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 454 { 455 u16 tmp_mux = 0; 456 int i; 457 458 len = min_t(int, len, LP5523_MAX_LEDS); 459 460 for (i = 0; i < len; i++) { 461 switch (buf[i]) { 462 case '1': 463 tmp_mux |= (1 << i); 464 break; 465 case '0': 466 break; 467 case '\n': 468 i = len; 469 break; 470 default: 471 return -1; 472 } 473 } 474 *mux = tmp_mux; 475 476 return 0; 477 } 478 479 static void lp5523_mux_to_array(u16 led_mux, char *array) 480 { 481 int i, pos = 0; 482 for (i = 0; i < LP5523_MAX_LEDS; i++) 483 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 484 485 array[pos] = '\0'; 486 } 487 488 static ssize_t show_engine_leds(struct device *dev, 489 struct device_attribute *attr, 490 char *buf, int nr) 491 { 492 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 493 struct lp55xx_chip *chip = led->chip; 494 char mux[LP5523_MAX_LEDS + 1]; 495 496 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 497 498 return sprintf(buf, "%s\n", mux); 499 } 500 show_leds(1) 501 show_leds(2) 502 show_leds(3) 503 504 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) 505 { 506 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 507 int ret; 508 static const u8 mux_page[] = { 509 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1, 510 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2, 511 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3, 512 }; 513 514 lp5523_load_engine(chip); 515 516 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]); 517 if (ret) 518 return ret; 519 520 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8)); 521 if (ret) 522 return ret; 523 524 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 525 if (ret) 526 return ret; 527 528 engine->led_mux = mux; 529 return 0; 530 } 531 532 static ssize_t store_engine_leds(struct device *dev, 533 struct device_attribute *attr, 534 const char *buf, size_t len, int nr) 535 { 536 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 537 struct lp55xx_chip *chip = led->chip; 538 struct lp55xx_engine *engine = &chip->engines[nr - 1]; 539 u16 mux = 0; 540 ssize_t ret; 541 542 if (lp5523_mux_parse(buf, &mux, len)) 543 return -EINVAL; 544 545 mutex_lock(&chip->lock); 546 547 chip->engine_idx = nr; 548 ret = -EINVAL; 549 550 if (engine->mode != LP55XX_ENGINE_LOAD) 551 goto leave; 552 553 if (lp5523_load_mux(chip, mux, nr)) 554 goto leave; 555 556 ret = len; 557 leave: 558 mutex_unlock(&chip->lock); 559 return ret; 560 } 561 store_leds(1) 562 store_leds(2) 563 store_leds(3) 564 565 static ssize_t store_engine_load(struct device *dev, 566 struct device_attribute *attr, 567 const char *buf, size_t len, int nr) 568 { 569 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 570 struct lp55xx_chip *chip = led->chip; 571 int ret; 572 573 mutex_lock(&chip->lock); 574 575 chip->engine_idx = nr; 576 lp5523_load_engine_and_select_page(chip); 577 ret = lp5523_update_program_memory(chip, buf, len); 578 579 mutex_unlock(&chip->lock); 580 581 return ret; 582 } 583 store_load(1) 584 store_load(2) 585 store_load(3) 586 587 static ssize_t lp5523_selftest(struct device *dev, 588 struct device_attribute *attr, 589 char *buf) 590 { 591 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 592 struct lp55xx_chip *chip = led->chip; 593 struct lp55xx_platform_data *pdata = chip->pdata; 594 int i, ret, pos = 0; 595 u8 status, adc, vdd; 596 597 mutex_lock(&chip->lock); 598 599 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 600 if (ret < 0) 601 goto fail; 602 603 /* Check that ext clock is really in use if requested */ 604 if (pdata->clock_mode == LP55XX_CLOCK_EXT) { 605 if ((status & LP5523_EXT_CLK_USED) == 0) 606 goto fail; 607 } 608 609 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 610 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); 611 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 612 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 613 if (ret < 0) 614 goto fail; 615 616 if (!(status & LP5523_LEDTEST_DONE)) 617 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 618 619 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd); 620 if (ret < 0) 621 goto fail; 622 623 vdd--; /* There may be some fluctuation in measurement */ 624 625 for (i = 0; i < LP5523_MAX_LEDS; i++) { 626 /* Skip non-existing channels */ 627 if (pdata->led_config[i].led_current == 0) 628 continue; 629 630 /* Set default current */ 631 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 632 pdata->led_config[i].led_current); 633 634 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff); 635 /* let current stabilize 2 - 4ms before measurements start */ 636 usleep_range(2000, 4000); 637 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, 638 LP5523_EN_LEDTEST | i); 639 /* ADC conversion time is 2.7 ms typically */ 640 usleep_range(3000, 6000); 641 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status); 642 if (ret < 0) 643 goto fail; 644 645 if (!(status & LP5523_LEDTEST_DONE)) 646 usleep_range(3000, 6000);/* Was not ready. Wait. */ 647 648 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc); 649 if (ret < 0) 650 goto fail; 651 652 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 653 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 654 655 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00); 656 657 /* Restore current */ 658 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i, 659 led->led_current); 660 led++; 661 } 662 if (pos == 0) 663 pos = sprintf(buf, "OK\n"); 664 goto release_lock; 665 fail: 666 pos = sprintf(buf, "FAIL\n"); 667 668 release_lock: 669 mutex_unlock(&chip->lock); 670 671 return pos; 672 } 673 674 #define show_fader(nr) \ 675 static ssize_t show_master_fader##nr(struct device *dev, \ 676 struct device_attribute *attr, \ 677 char *buf) \ 678 { \ 679 return show_master_fader(dev, attr, buf, nr); \ 680 } 681 682 #define store_fader(nr) \ 683 static ssize_t store_master_fader##nr(struct device *dev, \ 684 struct device_attribute *attr, \ 685 const char *buf, size_t len) \ 686 { \ 687 return store_master_fader(dev, attr, buf, len, nr); \ 688 } 689 690 static ssize_t show_master_fader(struct device *dev, 691 struct device_attribute *attr, 692 char *buf, int nr) 693 { 694 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 695 struct lp55xx_chip *chip = led->chip; 696 int ret; 697 u8 val; 698 699 mutex_lock(&chip->lock); 700 ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val); 701 mutex_unlock(&chip->lock); 702 703 if (ret == 0) 704 ret = sprintf(buf, "%u\n", val); 705 706 return ret; 707 } 708 show_fader(1) 709 show_fader(2) 710 show_fader(3) 711 712 static ssize_t store_master_fader(struct device *dev, 713 struct device_attribute *attr, 714 const char *buf, size_t len, int nr) 715 { 716 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 717 struct lp55xx_chip *chip = led->chip; 718 int ret; 719 unsigned long val; 720 721 if (kstrtoul(buf, 0, &val)) 722 return -EINVAL; 723 724 if (val > 0xff) 725 return -EINVAL; 726 727 mutex_lock(&chip->lock); 728 ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, 729 (u8)val); 730 mutex_unlock(&chip->lock); 731 732 if (ret == 0) 733 ret = len; 734 735 return ret; 736 } 737 store_fader(1) 738 store_fader(2) 739 store_fader(3) 740 741 static ssize_t show_master_fader_leds(struct device *dev, 742 struct device_attribute *attr, 743 char *buf) 744 { 745 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 746 struct lp55xx_chip *chip = led->chip; 747 int i, ret, pos = 0; 748 u8 val; 749 750 mutex_lock(&chip->lock); 751 752 for (i = 0; i < LP5523_MAX_LEDS; i++) { 753 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val); 754 if (ret) 755 goto leave; 756 757 val = (val & LP5523_FADER_MAPPING_MASK) 758 >> LP5523_FADER_MAPPING_SHIFT; 759 if (val > 3) { 760 ret = -EINVAL; 761 goto leave; 762 } 763 buf[pos++] = val + '0'; 764 } 765 buf[pos++] = '\n'; 766 ret = pos; 767 leave: 768 mutex_unlock(&chip->lock); 769 return ret; 770 } 771 772 static ssize_t store_master_fader_leds(struct device *dev, 773 struct device_attribute *attr, 774 const char *buf, size_t len) 775 { 776 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 777 struct lp55xx_chip *chip = led->chip; 778 int i, n, ret; 779 u8 val; 780 781 n = min_t(int, len, LP5523_MAX_LEDS); 782 783 mutex_lock(&chip->lock); 784 785 for (i = 0; i < n; i++) { 786 if (buf[i] >= '0' && buf[i] <= '3') { 787 val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT; 788 ret = lp55xx_update_bits(chip, 789 LP5523_REG_LED_CTRL_BASE + i, 790 LP5523_FADER_MAPPING_MASK, 791 val); 792 if (ret) 793 goto leave; 794 } else { 795 ret = -EINVAL; 796 goto leave; 797 } 798 } 799 ret = len; 800 leave: 801 mutex_unlock(&chip->lock); 802 return ret; 803 } 804 805 static int lp5523_led_brightness(struct lp55xx_led *led) 806 { 807 struct lp55xx_chip *chip = led->chip; 808 int ret; 809 810 mutex_lock(&chip->lock); 811 ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr, 812 led->brightness); 813 mutex_unlock(&chip->lock); 814 return ret; 815 } 816 817 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); 818 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); 819 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); 820 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds); 821 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds); 822 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds); 823 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); 824 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); 825 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); 826 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest); 827 static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1, 828 store_master_fader1); 829 static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2, 830 store_master_fader2); 831 static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3, 832 store_master_fader3); 833 static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds, 834 store_master_fader_leds); 835 836 static struct attribute *lp5523_attributes[] = { 837 &dev_attr_engine1_mode.attr, 838 &dev_attr_engine2_mode.attr, 839 &dev_attr_engine3_mode.attr, 840 &dev_attr_engine1_load.attr, 841 &dev_attr_engine2_load.attr, 842 &dev_attr_engine3_load.attr, 843 &dev_attr_engine1_leds.attr, 844 &dev_attr_engine2_leds.attr, 845 &dev_attr_engine3_leds.attr, 846 &dev_attr_selftest.attr, 847 &dev_attr_master_fader1.attr, 848 &dev_attr_master_fader2.attr, 849 &dev_attr_master_fader3.attr, 850 &dev_attr_master_fader_leds.attr, 851 NULL, 852 }; 853 854 static const struct attribute_group lp5523_group = { 855 .attrs = lp5523_attributes, 856 }; 857 858 /* Chip specific configurations */ 859 static struct lp55xx_device_config lp5523_cfg = { 860 .reset = { 861 .addr = LP5523_REG_RESET, 862 .val = LP5523_RESET, 863 }, 864 .enable = { 865 .addr = LP5523_REG_ENABLE, 866 .val = LP5523_ENABLE, 867 }, 868 .max_channel = LP5523_MAX_LEDS, 869 .post_init_device = lp5523_post_init_device, 870 .brightness_fn = lp5523_led_brightness, 871 .set_led_current = lp5523_set_led_current, 872 .firmware_cb = lp5523_firmware_loaded, 873 .run_engine = lp5523_run_engine, 874 .dev_attr_group = &lp5523_group, 875 }; 876 877 static int lp5523_probe(struct i2c_client *client, 878 const struct i2c_device_id *id) 879 { 880 int ret; 881 struct lp55xx_chip *chip; 882 struct lp55xx_led *led; 883 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev); 884 struct device_node *np = client->dev.of_node; 885 886 if (!pdata) { 887 if (np) { 888 pdata = lp55xx_of_populate_pdata(&client->dev, np); 889 if (IS_ERR(pdata)) 890 return PTR_ERR(pdata); 891 } else { 892 dev_err(&client->dev, "no platform data\n"); 893 return -EINVAL; 894 } 895 } 896 897 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 898 if (!chip) 899 return -ENOMEM; 900 901 led = devm_kzalloc(&client->dev, 902 sizeof(*led) * pdata->num_channels, GFP_KERNEL); 903 if (!led) 904 return -ENOMEM; 905 906 chip->cl = client; 907 chip->pdata = pdata; 908 chip->cfg = &lp5523_cfg; 909 910 mutex_init(&chip->lock); 911 912 i2c_set_clientdata(client, led); 913 914 ret = lp55xx_init_device(chip); 915 if (ret) 916 goto err_init; 917 918 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 919 920 ret = lp55xx_register_leds(led, chip); 921 if (ret) 922 goto err_register_leds; 923 924 ret = lp55xx_register_sysfs(chip); 925 if (ret) { 926 dev_err(&client->dev, "registering sysfs failed\n"); 927 goto err_register_sysfs; 928 } 929 930 return 0; 931 932 err_register_sysfs: 933 lp55xx_unregister_leds(led, chip); 934 err_register_leds: 935 lp55xx_deinit_device(chip); 936 err_init: 937 return ret; 938 } 939 940 static int lp5523_remove(struct i2c_client *client) 941 { 942 struct lp55xx_led *led = i2c_get_clientdata(client); 943 struct lp55xx_chip *chip = led->chip; 944 945 lp5523_stop_all_engines(chip); 946 lp55xx_unregister_sysfs(chip); 947 lp55xx_unregister_leds(led, chip); 948 lp55xx_deinit_device(chip); 949 950 return 0; 951 } 952 953 static const struct i2c_device_id lp5523_id[] = { 954 { "lp5523", LP5523 }, 955 { "lp55231", LP55231 }, 956 { } 957 }; 958 959 MODULE_DEVICE_TABLE(i2c, lp5523_id); 960 961 #ifdef CONFIG_OF 962 static const struct of_device_id of_lp5523_leds_match[] = { 963 { .compatible = "national,lp5523", }, 964 { .compatible = "ti,lp55231", }, 965 {}, 966 }; 967 968 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match); 969 #endif 970 971 static struct i2c_driver lp5523_driver = { 972 .driver = { 973 .name = "lp5523x", 974 .of_match_table = of_match_ptr(of_lp5523_leds_match), 975 }, 976 .probe = lp5523_probe, 977 .remove = lp5523_remove, 978 .id_table = lp5523_id, 979 }; 980 981 module_i2c_driver(lp5523_driver); 982 983 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 984 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 985 MODULE_DESCRIPTION("LP5523 LED engine"); 986 MODULE_LICENSE("GPL"); 987