1 /* 2 * lp5523.c - LP5523 LED Driver 3 * 4 * Copyright (C) 2010 Nokia Corporation 5 * 6 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/i2c.h> 26 #include <linux/mutex.h> 27 #include <linux/gpio.h> 28 #include <linux/interrupt.h> 29 #include <linux/delay.h> 30 #include <linux/ctype.h> 31 #include <linux/spinlock.h> 32 #include <linux/wait.h> 33 #include <linux/leds.h> 34 #include <linux/leds-lp5523.h> 35 #include <linux/workqueue.h> 36 #include <linux/slab.h> 37 38 #define LP5523_REG_ENABLE 0x00 39 #define LP5523_REG_OP_MODE 0x01 40 #define LP5523_REG_RATIOMETRIC_MSB 0x02 41 #define LP5523_REG_RATIOMETRIC_LSB 0x03 42 #define LP5523_REG_ENABLE_LEDS_MSB 0x04 43 #define LP5523_REG_ENABLE_LEDS_LSB 0x05 44 #define LP5523_REG_LED_CNTRL_BASE 0x06 45 #define LP5523_REG_LED_PWM_BASE 0x16 46 #define LP5523_REG_LED_CURRENT_BASE 0x26 47 #define LP5523_REG_CONFIG 0x36 48 #define LP5523_REG_CHANNEL1_PC 0x37 49 #define LP5523_REG_CHANNEL2_PC 0x38 50 #define LP5523_REG_CHANNEL3_PC 0x39 51 #define LP5523_REG_STATUS 0x3a 52 #define LP5523_REG_GPO 0x3b 53 #define LP5523_REG_VARIABLE 0x3c 54 #define LP5523_REG_RESET 0x3d 55 #define LP5523_REG_TEMP_CTRL 0x3e 56 #define LP5523_REG_TEMP_READ 0x3f 57 #define LP5523_REG_TEMP_WRITE 0x40 58 #define LP5523_REG_LED_TEST_CTRL 0x41 59 #define LP5523_REG_LED_TEST_ADC 0x42 60 #define LP5523_REG_ENG1_VARIABLE 0x45 61 #define LP5523_REG_ENG2_VARIABLE 0x46 62 #define LP5523_REG_ENG3_VARIABLE 0x47 63 #define LP5523_REG_MASTER_FADER1 0x48 64 #define LP5523_REG_MASTER_FADER2 0x49 65 #define LP5523_REG_MASTER_FADER3 0x4a 66 #define LP5523_REG_CH1_PROG_START 0x4c 67 #define LP5523_REG_CH2_PROG_START 0x4d 68 #define LP5523_REG_CH3_PROG_START 0x4e 69 #define LP5523_REG_PROG_PAGE_SEL 0x4f 70 #define LP5523_REG_PROG_MEM 0x50 71 72 #define LP5523_CMD_LOAD 0x15 /* 00010101 */ 73 #define LP5523_CMD_RUN 0x2a /* 00101010 */ 74 #define LP5523_CMD_DISABLED 0x00 /* 00000000 */ 75 76 #define LP5523_ENABLE 0x40 77 #define LP5523_AUTO_INC 0x40 78 #define LP5523_PWR_SAVE 0x20 79 #define LP5523_PWM_PWR_SAVE 0x04 80 #define LP5523_CP_1 0x08 81 #define LP5523_CP_1_5 0x10 82 #define LP5523_CP_AUTO 0x18 83 #define LP5523_INT_CLK 0x01 84 #define LP5523_AUTO_CLK 0x02 85 #define LP5523_EN_LEDTEST 0x80 86 #define LP5523_LEDTEST_DONE 0x80 87 88 #define LP5523_DEFAULT_CURRENT 50 /* microAmps */ 89 #define LP5523_PROGRAM_LENGTH 32 /* in bytes */ 90 #define LP5523_PROGRAM_PAGES 6 91 #define LP5523_ADC_SHORTCIRC_LIM 80 92 93 #define LP5523_LEDS 9 94 #define LP5523_ENGINES 3 95 96 #define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */ 97 98 #define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */ 99 100 #define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING 101 102 #define LP5523_EXT_CLK_USED 0x08 103 104 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) 105 #define SHIFT_MASK(id) (((id) - 1) * 2) 106 107 enum lp5523_chip_id { 108 LP5523, 109 LP55231, 110 }; 111 112 struct lp5523_engine { 113 int id; 114 u8 mode; 115 u8 prog_page; 116 u8 mux_page; 117 u16 led_mux; 118 u8 engine_mask; 119 }; 120 121 struct lp5523_led { 122 int id; 123 u8 chan_nr; 124 u8 led_current; 125 u8 max_current; 126 struct led_classdev cdev; 127 struct work_struct brightness_work; 128 u8 brightness; 129 }; 130 131 struct lp5523_chip { 132 struct mutex lock; /* Serialize control */ 133 struct i2c_client *client; 134 struct lp5523_engine engines[LP5523_ENGINES]; 135 struct lp5523_led leds[LP5523_LEDS]; 136 struct lp5523_platform_data *pdata; 137 u8 num_channels; 138 u8 num_leds; 139 }; 140 141 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev) 142 { 143 return container_of(cdev, struct lp5523_led, cdev); 144 } 145 146 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine) 147 { 148 return container_of(engine, struct lp5523_chip, 149 engines[engine->id - 1]); 150 } 151 152 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led) 153 { 154 return container_of(led, struct lp5523_chip, 155 leds[led->id]); 156 } 157 158 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode); 159 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode); 160 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern); 161 162 static void lp5523_led_brightness_work(struct work_struct *work); 163 164 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value) 165 { 166 return i2c_smbus_write_byte_data(client, reg, value); 167 } 168 169 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf) 170 { 171 s32 ret = i2c_smbus_read_byte_data(client, reg); 172 173 if (ret < 0) 174 return ret; 175 176 *buf = ret; 177 return 0; 178 } 179 180 static int lp5523_detect(struct i2c_client *client) 181 { 182 int ret; 183 u8 buf; 184 185 ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); 186 if (ret) 187 return ret; 188 ret = lp5523_read(client, LP5523_REG_ENABLE, &buf); 189 if (ret) 190 return ret; 191 if (buf == 0x40) 192 return 0; 193 else 194 return -ENODEV; 195 } 196 197 static int lp5523_configure(struct i2c_client *client) 198 { 199 struct lp5523_chip *chip = i2c_get_clientdata(client); 200 int ret = 0; 201 u8 status; 202 203 /* one pattern per engine setting led mux start and stop addresses */ 204 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { 205 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 206 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 207 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 208 }; 209 210 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); 211 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 212 usleep_range(1000, 2000); 213 214 ret |= lp5523_write(client, LP5523_REG_CONFIG, 215 LP5523_AUTO_INC | LP5523_PWR_SAVE | 216 LP5523_CP_AUTO | LP5523_AUTO_CLK | 217 LP5523_PWM_PWR_SAVE); 218 219 /* turn on all leds */ 220 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 221 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 222 223 /* hardcode 32 bytes of memory for each engine from program memory */ 224 ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00); 225 ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10); 226 ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20); 227 228 /* write led mux address space for each channel */ 229 ret |= lp5523_load_program(&chip->engines[0], pattern[0]); 230 ret |= lp5523_load_program(&chip->engines[1], pattern[1]); 231 ret |= lp5523_load_program(&chip->engines[2], pattern[2]); 232 233 if (ret) { 234 dev_err(&client->dev, "could not load mux programs\n"); 235 return -1; 236 } 237 238 /* set all engines exec state and mode to run 00101010 */ 239 ret |= lp5523_write(client, LP5523_REG_ENABLE, 240 (LP5523_CMD_RUN | LP5523_ENABLE)); 241 242 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN); 243 244 if (ret) { 245 dev_err(&client->dev, "could not start mux programs\n"); 246 return -1; 247 } 248 249 /* Let the programs run for couple of ms and check the engine status */ 250 usleep_range(3000, 6000); 251 ret = lp5523_read(client, LP5523_REG_STATUS, &status); 252 if (ret < 0) 253 return ret; 254 255 status &= LP5523_ENG_STATUS_MASK; 256 257 if (status == LP5523_ENG_STATUS_MASK) { 258 dev_dbg(&client->dev, "all engines configured\n"); 259 } else { 260 dev_info(&client->dev, "status == %x\n", status); 261 dev_err(&client->dev, "cound not configure LED engine\n"); 262 return -1; 263 } 264 265 dev_info(&client->dev, "disabling engines\n"); 266 267 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); 268 269 return ret; 270 } 271 272 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode) 273 { 274 struct lp5523_chip *chip = engine_to_lp5523(engine); 275 struct i2c_client *client = chip->client; 276 int ret; 277 u8 engine_state; 278 279 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state); 280 if (ret) 281 goto fail; 282 283 engine_state &= ~(engine->engine_mask); 284 285 /* set mode only for this engine */ 286 mode &= engine->engine_mask; 287 288 engine_state |= mode; 289 290 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state); 291 fail: 292 return ret; 293 } 294 295 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux) 296 { 297 struct lp5523_chip *chip = engine_to_lp5523(engine); 298 struct i2c_client *client = chip->client; 299 int ret = 0; 300 301 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 302 303 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page); 304 ret |= lp5523_write(client, LP5523_REG_PROG_MEM, 305 (u8)(mux >> 8)); 306 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 307 engine->led_mux = mux; 308 309 return ret; 310 } 311 312 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern) 313 { 314 struct lp5523_chip *chip = engine_to_lp5523(engine); 315 struct i2c_client *client = chip->client; 316 317 int ret = 0; 318 319 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 320 321 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, 322 engine->prog_page); 323 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM, 324 LP5523_PROGRAM_LENGTH, pattern); 325 326 return ret; 327 } 328 329 static int lp5523_run_program(struct lp5523_engine *engine) 330 { 331 struct lp5523_chip *chip = engine_to_lp5523(engine); 332 struct i2c_client *client = chip->client; 333 int ret; 334 335 ret = lp5523_write(client, LP5523_REG_ENABLE, 336 LP5523_CMD_RUN | LP5523_ENABLE); 337 if (ret) 338 goto fail; 339 340 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN); 341 fail: 342 return ret; 343 } 344 345 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 346 { 347 int i; 348 u16 tmp_mux = 0; 349 350 len = min_t(int, len, LP5523_LEDS); 351 for (i = 0; i < len; i++) { 352 switch (buf[i]) { 353 case '1': 354 tmp_mux |= (1 << i); 355 break; 356 case '0': 357 break; 358 case '\n': 359 i = len; 360 break; 361 default: 362 return -1; 363 } 364 } 365 *mux = tmp_mux; 366 367 return 0; 368 } 369 370 static void lp5523_mux_to_array(u16 led_mux, char *array) 371 { 372 int i, pos = 0; 373 for (i = 0; i < LP5523_LEDS; i++) 374 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 375 376 array[pos] = '\0'; 377 } 378 379 /*--------------------------------------------------------------*/ 380 /* Sysfs interface */ 381 /*--------------------------------------------------------------*/ 382 383 static ssize_t show_engine_leds(struct device *dev, 384 struct device_attribute *attr, 385 char *buf, int nr) 386 { 387 struct i2c_client *client = to_i2c_client(dev); 388 struct lp5523_chip *chip = i2c_get_clientdata(client); 389 char mux[LP5523_LEDS + 1]; 390 391 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 392 393 return sprintf(buf, "%s\n", mux); 394 } 395 396 #define show_leds(nr) \ 397 static ssize_t show_engine##nr##_leds(struct device *dev, \ 398 struct device_attribute *attr, \ 399 char *buf) \ 400 { \ 401 return show_engine_leds(dev, attr, buf, nr); \ 402 } 403 show_leds(1) 404 show_leds(2) 405 show_leds(3) 406 407 static ssize_t store_engine_leds(struct device *dev, 408 struct device_attribute *attr, 409 const char *buf, size_t len, int nr) 410 { 411 struct i2c_client *client = to_i2c_client(dev); 412 struct lp5523_chip *chip = i2c_get_clientdata(client); 413 u16 mux = 0; 414 ssize_t ret; 415 416 if (lp5523_mux_parse(buf, &mux, len)) 417 return -EINVAL; 418 419 mutex_lock(&chip->lock); 420 ret = -EINVAL; 421 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD) 422 goto leave; 423 424 if (lp5523_load_mux(&chip->engines[nr - 1], mux)) 425 goto leave; 426 427 ret = len; 428 leave: 429 mutex_unlock(&chip->lock); 430 return ret; 431 } 432 433 #define store_leds(nr) \ 434 static ssize_t store_engine##nr##_leds(struct device *dev, \ 435 struct device_attribute *attr, \ 436 const char *buf, size_t len) \ 437 { \ 438 return store_engine_leds(dev, attr, buf, len, nr); \ 439 } 440 store_leds(1) 441 store_leds(2) 442 store_leds(3) 443 444 static ssize_t lp5523_selftest(struct device *dev, 445 struct device_attribute *attr, 446 char *buf) 447 { 448 struct i2c_client *client = to_i2c_client(dev); 449 struct lp5523_chip *chip = i2c_get_clientdata(client); 450 int i, ret, pos = 0; 451 int led = 0; 452 u8 status, adc, vdd; 453 454 mutex_lock(&chip->lock); 455 456 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 457 if (ret < 0) 458 goto fail; 459 460 /* Check that ext clock is really in use if requested */ 461 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) 462 if ((status & LP5523_EXT_CLK_USED) == 0) 463 goto fail; 464 465 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 466 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, 467 LP5523_EN_LEDTEST | 16); 468 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 469 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 470 if (ret < 0) 471 goto fail; 472 473 if (!(status & LP5523_LEDTEST_DONE)) 474 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 475 476 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); 477 if (ret < 0) 478 goto fail; 479 480 vdd--; /* There may be some fluctuation in measurement */ 481 482 for (i = 0; i < LP5523_LEDS; i++) { 483 /* Skip non-existing channels */ 484 if (chip->pdata->led_config[i].led_current == 0) 485 continue; 486 487 /* Set default current */ 488 lp5523_write(chip->client, 489 LP5523_REG_LED_CURRENT_BASE + i, 490 chip->pdata->led_config[i].led_current); 491 492 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); 493 /* let current stabilize 2 - 4ms before measurements start */ 494 usleep_range(2000, 4000); 495 lp5523_write(chip->client, 496 LP5523_REG_LED_TEST_CTRL, 497 LP5523_EN_LEDTEST | i); 498 /* ADC conversion time is 2.7 ms typically */ 499 usleep_range(3000, 6000); 500 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 501 if (ret < 0) 502 goto fail; 503 504 if (!(status & LP5523_LEDTEST_DONE)) 505 usleep_range(3000, 6000);/* Was not ready. Wait. */ 506 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); 507 if (ret < 0) 508 goto fail; 509 510 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 511 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 512 513 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); 514 515 /* Restore current */ 516 lp5523_write(chip->client, 517 LP5523_REG_LED_CURRENT_BASE + i, 518 chip->leds[led].led_current); 519 led++; 520 } 521 if (pos == 0) 522 pos = sprintf(buf, "OK\n"); 523 goto release_lock; 524 fail: 525 pos = sprintf(buf, "FAIL\n"); 526 527 release_lock: 528 mutex_unlock(&chip->lock); 529 530 return pos; 531 } 532 533 static void lp5523_set_brightness(struct led_classdev *cdev, 534 enum led_brightness brightness) 535 { 536 struct lp5523_led *led = cdev_to_led(cdev); 537 538 led->brightness = (u8)brightness; 539 540 schedule_work(&led->brightness_work); 541 } 542 543 static void lp5523_led_brightness_work(struct work_struct *work) 544 { 545 struct lp5523_led *led = container_of(work, 546 struct lp5523_led, 547 brightness_work); 548 struct lp5523_chip *chip = led_to_lp5523(led); 549 struct i2c_client *client = chip->client; 550 551 mutex_lock(&chip->lock); 552 553 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, 554 led->brightness); 555 556 mutex_unlock(&chip->lock); 557 } 558 559 static int lp5523_do_store_load(struct lp5523_engine *engine, 560 const char *buf, size_t len) 561 { 562 struct lp5523_chip *chip = engine_to_lp5523(engine); 563 struct i2c_client *client = chip->client; 564 int ret, nrchars, offset = 0, i = 0; 565 char c[3]; 566 unsigned cmd; 567 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 568 569 if (engine->mode != LP5523_CMD_LOAD) 570 return -EINVAL; 571 572 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { 573 /* separate sscanfs because length is working only for %s */ 574 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); 575 ret = sscanf(c, "%2x", &cmd); 576 if (ret != 1) 577 goto fail; 578 pattern[i] = (u8)cmd; 579 580 offset += nrchars; 581 i++; 582 } 583 584 /* Each instruction is 16bit long. Check that length is even */ 585 if (i % 2) 586 goto fail; 587 588 mutex_lock(&chip->lock); 589 ret = lp5523_load_program(engine, pattern); 590 mutex_unlock(&chip->lock); 591 592 if (ret) { 593 dev_err(&client->dev, "failed loading pattern\n"); 594 return ret; 595 } 596 597 return len; 598 fail: 599 dev_err(&client->dev, "wrong pattern format\n"); 600 return -EINVAL; 601 } 602 603 static ssize_t store_engine_load(struct device *dev, 604 struct device_attribute *attr, 605 const char *buf, size_t len, int nr) 606 { 607 struct i2c_client *client = to_i2c_client(dev); 608 struct lp5523_chip *chip = i2c_get_clientdata(client); 609 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); 610 } 611 612 #define store_load(nr) \ 613 static ssize_t store_engine##nr##_load(struct device *dev, \ 614 struct device_attribute *attr, \ 615 const char *buf, size_t len) \ 616 { \ 617 return store_engine_load(dev, attr, buf, len, nr); \ 618 } 619 store_load(1) 620 store_load(2) 621 store_load(3) 622 623 static ssize_t show_engine_mode(struct device *dev, 624 struct device_attribute *attr, 625 char *buf, int nr) 626 { 627 struct i2c_client *client = to_i2c_client(dev); 628 struct lp5523_chip *chip = i2c_get_clientdata(client); 629 switch (chip->engines[nr - 1].mode) { 630 case LP5523_CMD_RUN: 631 return sprintf(buf, "run\n"); 632 case LP5523_CMD_LOAD: 633 return sprintf(buf, "load\n"); 634 case LP5523_CMD_DISABLED: 635 return sprintf(buf, "disabled\n"); 636 default: 637 return sprintf(buf, "disabled\n"); 638 } 639 } 640 641 #define show_mode(nr) \ 642 static ssize_t show_engine##nr##_mode(struct device *dev, \ 643 struct device_attribute *attr, \ 644 char *buf) \ 645 { \ 646 return show_engine_mode(dev, attr, buf, nr); \ 647 } 648 show_mode(1) 649 show_mode(2) 650 show_mode(3) 651 652 static ssize_t store_engine_mode(struct device *dev, 653 struct device_attribute *attr, 654 const char *buf, size_t len, int nr) 655 { 656 struct i2c_client *client = to_i2c_client(dev); 657 struct lp5523_chip *chip = i2c_get_clientdata(client); 658 struct lp5523_engine *engine = &chip->engines[nr - 1]; 659 mutex_lock(&chip->lock); 660 661 if (!strncmp(buf, "run", 3)) 662 lp5523_set_mode(engine, LP5523_CMD_RUN); 663 else if (!strncmp(buf, "load", 4)) 664 lp5523_set_mode(engine, LP5523_CMD_LOAD); 665 else if (!strncmp(buf, "disabled", 8)) 666 lp5523_set_mode(engine, LP5523_CMD_DISABLED); 667 668 mutex_unlock(&chip->lock); 669 return len; 670 } 671 672 #define store_mode(nr) \ 673 static ssize_t store_engine##nr##_mode(struct device *dev, \ 674 struct device_attribute *attr, \ 675 const char *buf, size_t len) \ 676 { \ 677 return store_engine_mode(dev, attr, buf, len, nr); \ 678 } 679 store_mode(1) 680 store_mode(2) 681 store_mode(3) 682 683 static ssize_t show_max_current(struct device *dev, 684 struct device_attribute *attr, 685 char *buf) 686 { 687 struct led_classdev *led_cdev = dev_get_drvdata(dev); 688 struct lp5523_led *led = cdev_to_led(led_cdev); 689 690 return sprintf(buf, "%d\n", led->max_current); 691 } 692 693 static ssize_t show_current(struct device *dev, 694 struct device_attribute *attr, 695 char *buf) 696 { 697 struct led_classdev *led_cdev = dev_get_drvdata(dev); 698 struct lp5523_led *led = cdev_to_led(led_cdev); 699 700 return sprintf(buf, "%d\n", led->led_current); 701 } 702 703 static ssize_t store_current(struct device *dev, 704 struct device_attribute *attr, 705 const char *buf, size_t len) 706 { 707 struct led_classdev *led_cdev = dev_get_drvdata(dev); 708 struct lp5523_led *led = cdev_to_led(led_cdev); 709 struct lp5523_chip *chip = led_to_lp5523(led); 710 ssize_t ret; 711 unsigned long curr; 712 713 if (kstrtoul(buf, 0, &curr)) 714 return -EINVAL; 715 716 if (curr > led->max_current) 717 return -EINVAL; 718 719 mutex_lock(&chip->lock); 720 ret = lp5523_write(chip->client, 721 LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 722 (u8)curr); 723 mutex_unlock(&chip->lock); 724 725 if (ret < 0) 726 return ret; 727 728 led->led_current = (u8)curr; 729 730 return len; 731 } 732 733 /* led class device attributes */ 734 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); 735 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); 736 737 static struct attribute *lp5523_led_attributes[] = { 738 &dev_attr_led_current.attr, 739 &dev_attr_max_current.attr, 740 NULL, 741 }; 742 743 static struct attribute_group lp5523_led_attribute_group = { 744 .attrs = lp5523_led_attributes 745 }; 746 747 /* device attributes */ 748 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, 749 show_engine1_mode, store_engine1_mode); 750 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, 751 show_engine2_mode, store_engine2_mode); 752 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, 753 show_engine3_mode, store_engine3_mode); 754 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR, 755 show_engine1_leds, store_engine1_leds); 756 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR, 757 show_engine2_leds, store_engine2_leds); 758 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR, 759 show_engine3_leds, store_engine3_leds); 760 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); 761 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); 762 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); 763 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); 764 765 static struct attribute *lp5523_attributes[] = { 766 &dev_attr_engine1_mode.attr, 767 &dev_attr_engine2_mode.attr, 768 &dev_attr_engine3_mode.attr, 769 &dev_attr_selftest.attr, 770 &dev_attr_engine1_load.attr, 771 &dev_attr_engine1_leds.attr, 772 &dev_attr_engine2_load.attr, 773 &dev_attr_engine2_leds.attr, 774 &dev_attr_engine3_load.attr, 775 &dev_attr_engine3_leds.attr, 776 NULL, 777 }; 778 779 static const struct attribute_group lp5523_group = { 780 .attrs = lp5523_attributes, 781 }; 782 783 static int lp5523_register_sysfs(struct i2c_client *client) 784 { 785 struct device *dev = &client->dev; 786 int ret; 787 788 ret = sysfs_create_group(&dev->kobj, &lp5523_group); 789 if (ret < 0) 790 return ret; 791 792 return 0; 793 } 794 795 static void lp5523_unregister_sysfs(struct i2c_client *client) 796 { 797 struct lp5523_chip *chip = i2c_get_clientdata(client); 798 struct device *dev = &client->dev; 799 int i; 800 801 sysfs_remove_group(&dev->kobj, &lp5523_group); 802 803 for (i = 0; i < chip->num_leds; i++) 804 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, 805 &lp5523_led_attribute_group); 806 } 807 808 /*--------------------------------------------------------------*/ 809 /* Set chip operating mode */ 810 /*--------------------------------------------------------------*/ 811 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode) 812 { 813 /* if in that mode already do nothing, except for run */ 814 if (mode == engine->mode && mode != LP5523_CMD_RUN) 815 return; 816 817 switch (mode) { 818 case LP5523_CMD_RUN: 819 lp5523_run_program(engine); 820 break; 821 case LP5523_CMD_LOAD: 822 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); 823 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 824 break; 825 case LP5523_CMD_DISABLED: 826 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); 827 break; 828 default: 829 return; 830 } 831 832 engine->mode = mode; 833 } 834 835 /*--------------------------------------------------------------*/ 836 /* Probe, Attach, Remove */ 837 /*--------------------------------------------------------------*/ 838 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) 839 { 840 if (id < 1 || id > LP5523_ENGINES) 841 return -1; 842 engine->id = id; 843 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); 844 engine->prog_page = id - 1; 845 engine->mux_page = id + 2; 846 847 return 0; 848 } 849 850 static int lp5523_init_led(struct lp5523_led *led, struct device *dev, 851 int chan, struct lp5523_platform_data *pdata, 852 const char *chip_name) 853 { 854 char name[32]; 855 int res; 856 857 if (chan >= LP5523_LEDS) 858 return -EINVAL; 859 860 if (pdata->led_config[chan].led_current) { 861 led->led_current = pdata->led_config[chan].led_current; 862 led->max_current = pdata->led_config[chan].max_current; 863 led->chan_nr = pdata->led_config[chan].chan_nr; 864 865 if (led->chan_nr >= LP5523_LEDS) { 866 dev_err(dev, "Use channel numbers between 0 and %d\n", 867 LP5523_LEDS - 1); 868 return -EINVAL; 869 } 870 871 if (pdata->led_config[chan].name) { 872 led->cdev.name = pdata->led_config[chan].name; 873 } else { 874 snprintf(name, sizeof(name), "%s:channel%d", 875 pdata->label ? : chip_name, chan); 876 led->cdev.name = name; 877 } 878 879 led->cdev.brightness_set = lp5523_set_brightness; 880 res = led_classdev_register(dev, &led->cdev); 881 if (res < 0) { 882 dev_err(dev, "couldn't register led on channel %d\n", 883 chan); 884 return res; 885 } 886 res = sysfs_create_group(&led->cdev.dev->kobj, 887 &lp5523_led_attribute_group); 888 if (res < 0) { 889 dev_err(dev, "couldn't register current attribute\n"); 890 led_classdev_unregister(&led->cdev); 891 return res; 892 } 893 } else { 894 led->led_current = 0; 895 } 896 return 0; 897 } 898 899 static int lp5523_probe(struct i2c_client *client, 900 const struct i2c_device_id *id) 901 { 902 struct lp5523_chip *chip; 903 struct lp5523_platform_data *pdata; 904 int ret, i, led; 905 906 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 907 if (!chip) 908 return -ENOMEM; 909 910 i2c_set_clientdata(client, chip); 911 chip->client = client; 912 913 pdata = client->dev.platform_data; 914 915 if (!pdata) { 916 dev_err(&client->dev, "no platform data\n"); 917 return -EINVAL; 918 } 919 920 mutex_init(&chip->lock); 921 922 chip->pdata = pdata; 923 924 if (pdata->setup_resources) { 925 ret = pdata->setup_resources(); 926 if (ret < 0) 927 return ret; 928 } 929 930 if (pdata->enable) { 931 pdata->enable(0); 932 usleep_range(1000, 2000); /* Keep enable down at least 1ms */ 933 pdata->enable(1); 934 usleep_range(1000, 2000); /* 500us abs min. */ 935 } 936 937 lp5523_write(client, LP5523_REG_RESET, 0xff); 938 usleep_range(10000, 20000); /* 939 * Exact value is not available. 10 - 20ms 940 * appears to be enough for reset. 941 */ 942 ret = lp5523_detect(client); 943 if (ret) 944 goto fail1; 945 946 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 947 948 /* Initialize engines */ 949 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { 950 ret = lp5523_init_engine(&chip->engines[i], i + 1); 951 if (ret) { 952 dev_err(&client->dev, "error initializing engine\n"); 953 goto fail1; 954 } 955 } 956 ret = lp5523_configure(client); 957 if (ret < 0) { 958 dev_err(&client->dev, "error configuring chip\n"); 959 goto fail1; 960 } 961 962 /* Initialize leds */ 963 chip->num_channels = pdata->num_channels; 964 chip->num_leds = 0; 965 led = 0; 966 for (i = 0; i < pdata->num_channels; i++) { 967 /* Do not initialize channels that are not connected */ 968 if (pdata->led_config[i].led_current == 0) 969 continue; 970 971 INIT_WORK(&chip->leds[led].brightness_work, 972 lp5523_led_brightness_work); 973 974 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata, 975 id->name); 976 if (ret) { 977 dev_err(&client->dev, "error initializing leds\n"); 978 goto fail2; 979 } 980 chip->num_leds++; 981 982 chip->leds[led].id = led; 983 /* Set LED current */ 984 lp5523_write(client, 985 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, 986 chip->leds[led].led_current); 987 988 led++; 989 } 990 991 ret = lp5523_register_sysfs(client); 992 if (ret) { 993 dev_err(&client->dev, "registering sysfs failed\n"); 994 goto fail2; 995 } 996 return ret; 997 fail2: 998 for (i = 0; i < chip->num_leds; i++) { 999 led_classdev_unregister(&chip->leds[i].cdev); 1000 flush_work(&chip->leds[i].brightness_work); 1001 } 1002 fail1: 1003 if (pdata->enable) 1004 pdata->enable(0); 1005 if (pdata->release_resources) 1006 pdata->release_resources(); 1007 return ret; 1008 } 1009 1010 static int lp5523_remove(struct i2c_client *client) 1011 { 1012 struct lp5523_chip *chip = i2c_get_clientdata(client); 1013 int i; 1014 1015 /* Disable engine mode */ 1016 lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); 1017 1018 lp5523_unregister_sysfs(client); 1019 1020 for (i = 0; i < chip->num_leds; i++) { 1021 led_classdev_unregister(&chip->leds[i].cdev); 1022 flush_work(&chip->leds[i].brightness_work); 1023 } 1024 1025 if (chip->pdata->enable) 1026 chip->pdata->enable(0); 1027 if (chip->pdata->release_resources) 1028 chip->pdata->release_resources(); 1029 return 0; 1030 } 1031 1032 static const struct i2c_device_id lp5523_id[] = { 1033 { "lp5523", LP5523 }, 1034 { "lp55231", LP55231 }, 1035 { } 1036 }; 1037 1038 MODULE_DEVICE_TABLE(i2c, lp5523_id); 1039 1040 static struct i2c_driver lp5523_driver = { 1041 .driver = { 1042 .name = "lp5523x", 1043 }, 1044 .probe = lp5523_probe, 1045 .remove = lp5523_remove, 1046 .id_table = lp5523_id, 1047 }; 1048 1049 module_i2c_driver(lp5523_driver); 1050 1051 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 1052 MODULE_DESCRIPTION("LP5523 LED engine"); 1053 MODULE_LICENSE("GPL"); 1054