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 -EIO; 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 lp5523_read(client, LP5523_REG_STATUS, &status); 252 status &= LP5523_ENG_STATUS_MASK; 253 254 if (status == LP5523_ENG_STATUS_MASK) { 255 dev_dbg(&client->dev, "all engines configured\n"); 256 } else { 257 dev_info(&client->dev, "status == %x\n", status); 258 dev_err(&client->dev, "cound not configure LED engine\n"); 259 return -1; 260 } 261 262 dev_info(&client->dev, "disabling engines\n"); 263 264 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); 265 266 return ret; 267 } 268 269 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode) 270 { 271 struct lp5523_chip *chip = engine_to_lp5523(engine); 272 struct i2c_client *client = chip->client; 273 int ret; 274 u8 engine_state; 275 276 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state); 277 if (ret) 278 goto fail; 279 280 engine_state &= ~(engine->engine_mask); 281 282 /* set mode only for this engine */ 283 mode &= engine->engine_mask; 284 285 engine_state |= mode; 286 287 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state); 288 fail: 289 return ret; 290 } 291 292 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux) 293 { 294 struct lp5523_chip *chip = engine_to_lp5523(engine); 295 struct i2c_client *client = chip->client; 296 int ret = 0; 297 298 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 299 300 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page); 301 ret |= lp5523_write(client, LP5523_REG_PROG_MEM, 302 (u8)(mux >> 8)); 303 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 304 engine->led_mux = mux; 305 306 return ret; 307 } 308 309 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern) 310 { 311 struct lp5523_chip *chip = engine_to_lp5523(engine); 312 struct i2c_client *client = chip->client; 313 314 int ret = 0; 315 316 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 317 318 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, 319 engine->prog_page); 320 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM, 321 LP5523_PROGRAM_LENGTH, pattern); 322 323 return ret; 324 } 325 326 static int lp5523_run_program(struct lp5523_engine *engine) 327 { 328 struct lp5523_chip *chip = engine_to_lp5523(engine); 329 struct i2c_client *client = chip->client; 330 int ret; 331 332 ret = lp5523_write(client, LP5523_REG_ENABLE, 333 LP5523_CMD_RUN | LP5523_ENABLE); 334 if (ret) 335 goto fail; 336 337 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN); 338 fail: 339 return ret; 340 } 341 342 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 343 { 344 int i; 345 u16 tmp_mux = 0; 346 347 len = min_t(int, len, LP5523_LEDS); 348 for (i = 0; i < len; i++) { 349 switch (buf[i]) { 350 case '1': 351 tmp_mux |= (1 << i); 352 break; 353 case '0': 354 break; 355 case '\n': 356 i = len; 357 break; 358 default: 359 return -1; 360 } 361 } 362 *mux = tmp_mux; 363 364 return 0; 365 } 366 367 static void lp5523_mux_to_array(u16 led_mux, char *array) 368 { 369 int i, pos = 0; 370 for (i = 0; i < LP5523_LEDS; i++) 371 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 372 373 array[pos] = '\0'; 374 } 375 376 /*--------------------------------------------------------------*/ 377 /* Sysfs interface */ 378 /*--------------------------------------------------------------*/ 379 380 static ssize_t show_engine_leds(struct device *dev, 381 struct device_attribute *attr, 382 char *buf, int nr) 383 { 384 struct i2c_client *client = to_i2c_client(dev); 385 struct lp5523_chip *chip = i2c_get_clientdata(client); 386 char mux[LP5523_LEDS + 1]; 387 388 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 389 390 return sprintf(buf, "%s\n", mux); 391 } 392 393 #define show_leds(nr) \ 394 static ssize_t show_engine##nr##_leds(struct device *dev, \ 395 struct device_attribute *attr, \ 396 char *buf) \ 397 { \ 398 return show_engine_leds(dev, attr, buf, nr); \ 399 } 400 show_leds(1) 401 show_leds(2) 402 show_leds(3) 403 404 static ssize_t store_engine_leds(struct device *dev, 405 struct device_attribute *attr, 406 const char *buf, size_t len, int nr) 407 { 408 struct i2c_client *client = to_i2c_client(dev); 409 struct lp5523_chip *chip = i2c_get_clientdata(client); 410 u16 mux = 0; 411 ssize_t ret; 412 413 if (lp5523_mux_parse(buf, &mux, len)) 414 return -EINVAL; 415 416 mutex_lock(&chip->lock); 417 ret = -EINVAL; 418 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD) 419 goto leave; 420 421 if (lp5523_load_mux(&chip->engines[nr - 1], mux)) 422 goto leave; 423 424 ret = len; 425 leave: 426 mutex_unlock(&chip->lock); 427 return ret; 428 } 429 430 #define store_leds(nr) \ 431 static ssize_t store_engine##nr##_leds(struct device *dev, \ 432 struct device_attribute *attr, \ 433 const char *buf, size_t len) \ 434 { \ 435 return store_engine_leds(dev, attr, buf, len, nr); \ 436 } 437 store_leds(1) 438 store_leds(2) 439 store_leds(3) 440 441 static ssize_t lp5523_selftest(struct device *dev, 442 struct device_attribute *attr, 443 char *buf) 444 { 445 struct i2c_client *client = to_i2c_client(dev); 446 struct lp5523_chip *chip = i2c_get_clientdata(client); 447 int i, ret, pos = 0; 448 int led = 0; 449 u8 status, adc, vdd; 450 451 mutex_lock(&chip->lock); 452 453 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 454 if (ret < 0) 455 goto fail; 456 457 /* Check that ext clock is really in use if requested */ 458 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) 459 if ((status & LP5523_EXT_CLK_USED) == 0) 460 goto fail; 461 462 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 463 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, 464 LP5523_EN_LEDTEST | 16); 465 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 466 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 467 if (!(status & LP5523_LEDTEST_DONE)) 468 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 469 470 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); 471 vdd--; /* There may be some fluctuation in measurement */ 472 473 for (i = 0; i < LP5523_LEDS; i++) { 474 /* Skip non-existing channels */ 475 if (chip->pdata->led_config[i].led_current == 0) 476 continue; 477 478 /* Set default current */ 479 lp5523_write(chip->client, 480 LP5523_REG_LED_CURRENT_BASE + i, 481 chip->pdata->led_config[i].led_current); 482 483 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); 484 /* let current stabilize 2 - 4ms before measurements start */ 485 usleep_range(2000, 4000); 486 lp5523_write(chip->client, 487 LP5523_REG_LED_TEST_CTRL, 488 LP5523_EN_LEDTEST | i); 489 /* ADC conversion time is 2.7 ms typically */ 490 usleep_range(3000, 6000); 491 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 492 if (!(status & LP5523_LEDTEST_DONE)) 493 usleep_range(3000, 6000);/* Was not ready. Wait. */ 494 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); 495 496 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 497 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 498 499 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); 500 501 /* Restore current */ 502 lp5523_write(chip->client, 503 LP5523_REG_LED_CURRENT_BASE + i, 504 chip->leds[led].led_current); 505 led++; 506 } 507 if (pos == 0) 508 pos = sprintf(buf, "OK\n"); 509 goto release_lock; 510 fail: 511 pos = sprintf(buf, "FAIL\n"); 512 513 release_lock: 514 mutex_unlock(&chip->lock); 515 516 return pos; 517 } 518 519 static void lp5523_set_brightness(struct led_classdev *cdev, 520 enum led_brightness brightness) 521 { 522 struct lp5523_led *led = cdev_to_led(cdev); 523 524 led->brightness = (u8)brightness; 525 526 schedule_work(&led->brightness_work); 527 } 528 529 static void lp5523_led_brightness_work(struct work_struct *work) 530 { 531 struct lp5523_led *led = container_of(work, 532 struct lp5523_led, 533 brightness_work); 534 struct lp5523_chip *chip = led_to_lp5523(led); 535 struct i2c_client *client = chip->client; 536 537 mutex_lock(&chip->lock); 538 539 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, 540 led->brightness); 541 542 mutex_unlock(&chip->lock); 543 } 544 545 static int lp5523_do_store_load(struct lp5523_engine *engine, 546 const char *buf, size_t len) 547 { 548 struct lp5523_chip *chip = engine_to_lp5523(engine); 549 struct i2c_client *client = chip->client; 550 int ret, nrchars, offset = 0, i = 0; 551 char c[3]; 552 unsigned cmd; 553 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 554 555 if (engine->mode != LP5523_CMD_LOAD) 556 return -EINVAL; 557 558 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { 559 /* separate sscanfs because length is working only for %s */ 560 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); 561 ret = sscanf(c, "%2x", &cmd); 562 if (ret != 1) 563 goto fail; 564 pattern[i] = (u8)cmd; 565 566 offset += nrchars; 567 i++; 568 } 569 570 /* Each instruction is 16bit long. Check that length is even */ 571 if (i % 2) 572 goto fail; 573 574 mutex_lock(&chip->lock); 575 ret = lp5523_load_program(engine, pattern); 576 mutex_unlock(&chip->lock); 577 578 if (ret) { 579 dev_err(&client->dev, "failed loading pattern\n"); 580 return ret; 581 } 582 583 return len; 584 fail: 585 dev_err(&client->dev, "wrong pattern format\n"); 586 return -EINVAL; 587 } 588 589 static ssize_t store_engine_load(struct device *dev, 590 struct device_attribute *attr, 591 const char *buf, size_t len, int nr) 592 { 593 struct i2c_client *client = to_i2c_client(dev); 594 struct lp5523_chip *chip = i2c_get_clientdata(client); 595 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); 596 } 597 598 #define store_load(nr) \ 599 static ssize_t store_engine##nr##_load(struct device *dev, \ 600 struct device_attribute *attr, \ 601 const char *buf, size_t len) \ 602 { \ 603 return store_engine_load(dev, attr, buf, len, nr); \ 604 } 605 store_load(1) 606 store_load(2) 607 store_load(3) 608 609 static ssize_t show_engine_mode(struct device *dev, 610 struct device_attribute *attr, 611 char *buf, int nr) 612 { 613 struct i2c_client *client = to_i2c_client(dev); 614 struct lp5523_chip *chip = i2c_get_clientdata(client); 615 switch (chip->engines[nr - 1].mode) { 616 case LP5523_CMD_RUN: 617 return sprintf(buf, "run\n"); 618 case LP5523_CMD_LOAD: 619 return sprintf(buf, "load\n"); 620 case LP5523_CMD_DISABLED: 621 return sprintf(buf, "disabled\n"); 622 default: 623 return sprintf(buf, "disabled\n"); 624 } 625 } 626 627 #define show_mode(nr) \ 628 static ssize_t show_engine##nr##_mode(struct device *dev, \ 629 struct device_attribute *attr, \ 630 char *buf) \ 631 { \ 632 return show_engine_mode(dev, attr, buf, nr); \ 633 } 634 show_mode(1) 635 show_mode(2) 636 show_mode(3) 637 638 static ssize_t store_engine_mode(struct device *dev, 639 struct device_attribute *attr, 640 const char *buf, size_t len, int nr) 641 { 642 struct i2c_client *client = to_i2c_client(dev); 643 struct lp5523_chip *chip = i2c_get_clientdata(client); 644 struct lp5523_engine *engine = &chip->engines[nr - 1]; 645 mutex_lock(&chip->lock); 646 647 if (!strncmp(buf, "run", 3)) 648 lp5523_set_mode(engine, LP5523_CMD_RUN); 649 else if (!strncmp(buf, "load", 4)) 650 lp5523_set_mode(engine, LP5523_CMD_LOAD); 651 else if (!strncmp(buf, "disabled", 8)) 652 lp5523_set_mode(engine, LP5523_CMD_DISABLED); 653 654 mutex_unlock(&chip->lock); 655 return len; 656 } 657 658 #define store_mode(nr) \ 659 static ssize_t store_engine##nr##_mode(struct device *dev, \ 660 struct device_attribute *attr, \ 661 const char *buf, size_t len) \ 662 { \ 663 return store_engine_mode(dev, attr, buf, len, nr); \ 664 } 665 store_mode(1) 666 store_mode(2) 667 store_mode(3) 668 669 static ssize_t show_max_current(struct device *dev, 670 struct device_attribute *attr, 671 char *buf) 672 { 673 struct led_classdev *led_cdev = dev_get_drvdata(dev); 674 struct lp5523_led *led = cdev_to_led(led_cdev); 675 676 return sprintf(buf, "%d\n", led->max_current); 677 } 678 679 static ssize_t show_current(struct device *dev, 680 struct device_attribute *attr, 681 char *buf) 682 { 683 struct led_classdev *led_cdev = dev_get_drvdata(dev); 684 struct lp5523_led *led = cdev_to_led(led_cdev); 685 686 return sprintf(buf, "%d\n", led->led_current); 687 } 688 689 static ssize_t store_current(struct device *dev, 690 struct device_attribute *attr, 691 const char *buf, size_t len) 692 { 693 struct led_classdev *led_cdev = dev_get_drvdata(dev); 694 struct lp5523_led *led = cdev_to_led(led_cdev); 695 struct lp5523_chip *chip = led_to_lp5523(led); 696 ssize_t ret; 697 unsigned long curr; 698 699 if (strict_strtoul(buf, 0, &curr)) 700 return -EINVAL; 701 702 if (curr > led->max_current) 703 return -EINVAL; 704 705 mutex_lock(&chip->lock); 706 ret = lp5523_write(chip->client, 707 LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 708 (u8)curr); 709 mutex_unlock(&chip->lock); 710 711 if (ret < 0) 712 return ret; 713 714 led->led_current = (u8)curr; 715 716 return len; 717 } 718 719 /* led class device attributes */ 720 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); 721 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); 722 723 static struct attribute *lp5523_led_attributes[] = { 724 &dev_attr_led_current.attr, 725 &dev_attr_max_current.attr, 726 NULL, 727 }; 728 729 static struct attribute_group lp5523_led_attribute_group = { 730 .attrs = lp5523_led_attributes 731 }; 732 733 /* device attributes */ 734 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, 735 show_engine1_mode, store_engine1_mode); 736 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, 737 show_engine2_mode, store_engine2_mode); 738 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, 739 show_engine3_mode, store_engine3_mode); 740 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR, 741 show_engine1_leds, store_engine1_leds); 742 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR, 743 show_engine2_leds, store_engine2_leds); 744 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR, 745 show_engine3_leds, store_engine3_leds); 746 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); 747 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); 748 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); 749 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); 750 751 static struct attribute *lp5523_attributes[] = { 752 &dev_attr_engine1_mode.attr, 753 &dev_attr_engine2_mode.attr, 754 &dev_attr_engine3_mode.attr, 755 &dev_attr_selftest.attr, 756 &dev_attr_engine1_load.attr, 757 &dev_attr_engine1_leds.attr, 758 &dev_attr_engine2_load.attr, 759 &dev_attr_engine2_leds.attr, 760 &dev_attr_engine3_load.attr, 761 &dev_attr_engine3_leds.attr, 762 NULL, 763 }; 764 765 static const struct attribute_group lp5523_group = { 766 .attrs = lp5523_attributes, 767 }; 768 769 static int lp5523_register_sysfs(struct i2c_client *client) 770 { 771 struct device *dev = &client->dev; 772 int ret; 773 774 ret = sysfs_create_group(&dev->kobj, &lp5523_group); 775 if (ret < 0) 776 return ret; 777 778 return 0; 779 } 780 781 static void lp5523_unregister_sysfs(struct i2c_client *client) 782 { 783 struct lp5523_chip *chip = i2c_get_clientdata(client); 784 struct device *dev = &client->dev; 785 int i; 786 787 sysfs_remove_group(&dev->kobj, &lp5523_group); 788 789 for (i = 0; i < chip->num_leds; i++) 790 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, 791 &lp5523_led_attribute_group); 792 } 793 794 /*--------------------------------------------------------------*/ 795 /* Set chip operating mode */ 796 /*--------------------------------------------------------------*/ 797 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode) 798 { 799 /* if in that mode already do nothing, except for run */ 800 if (mode == engine->mode && mode != LP5523_CMD_RUN) 801 return; 802 803 switch (mode) { 804 case LP5523_CMD_RUN: 805 lp5523_run_program(engine); 806 break; 807 case LP5523_CMD_LOAD: 808 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); 809 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 810 break; 811 case LP5523_CMD_DISABLED: 812 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); 813 break; 814 default: 815 return; 816 } 817 818 engine->mode = mode; 819 } 820 821 /*--------------------------------------------------------------*/ 822 /* Probe, Attach, Remove */ 823 /*--------------------------------------------------------------*/ 824 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) 825 { 826 if (id < 1 || id > LP5523_ENGINES) 827 return -1; 828 engine->id = id; 829 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); 830 engine->prog_page = id - 1; 831 engine->mux_page = id + 2; 832 833 return 0; 834 } 835 836 static int lp5523_init_led(struct lp5523_led *led, struct device *dev, 837 int chan, struct lp5523_platform_data *pdata, 838 const char *chip_name) 839 { 840 char name[32]; 841 int res; 842 843 if (chan >= LP5523_LEDS) 844 return -EINVAL; 845 846 if (pdata->led_config[chan].led_current) { 847 led->led_current = pdata->led_config[chan].led_current; 848 led->max_current = pdata->led_config[chan].max_current; 849 led->chan_nr = pdata->led_config[chan].chan_nr; 850 851 if (led->chan_nr >= LP5523_LEDS) { 852 dev_err(dev, "Use channel numbers between 0 and %d\n", 853 LP5523_LEDS - 1); 854 return -EINVAL; 855 } 856 857 if (pdata->led_config[chan].name) { 858 led->cdev.name = pdata->led_config[chan].name; 859 } else { 860 snprintf(name, sizeof(name), "%s:channel%d", 861 pdata->label ? : chip_name, chan); 862 led->cdev.name = name; 863 } 864 865 led->cdev.brightness_set = lp5523_set_brightness; 866 res = led_classdev_register(dev, &led->cdev); 867 if (res < 0) { 868 dev_err(dev, "couldn't register led on channel %d\n", 869 chan); 870 return res; 871 } 872 res = sysfs_create_group(&led->cdev.dev->kobj, 873 &lp5523_led_attribute_group); 874 if (res < 0) { 875 dev_err(dev, "couldn't register current attribute\n"); 876 led_classdev_unregister(&led->cdev); 877 return res; 878 } 879 } else { 880 led->led_current = 0; 881 } 882 return 0; 883 } 884 885 static int lp5523_probe(struct i2c_client *client, 886 const struct i2c_device_id *id) 887 { 888 struct lp5523_chip *chip; 889 struct lp5523_platform_data *pdata; 890 int ret, i, led; 891 892 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 893 if (!chip) 894 return -ENOMEM; 895 896 i2c_set_clientdata(client, chip); 897 chip->client = client; 898 899 pdata = client->dev.platform_data; 900 901 if (!pdata) { 902 dev_err(&client->dev, "no platform data\n"); 903 return -EINVAL; 904 } 905 906 mutex_init(&chip->lock); 907 908 chip->pdata = pdata; 909 910 if (pdata->setup_resources) { 911 ret = pdata->setup_resources(); 912 if (ret < 0) 913 return ret; 914 } 915 916 if (pdata->enable) { 917 pdata->enable(0); 918 usleep_range(1000, 2000); /* Keep enable down at least 1ms */ 919 pdata->enable(1); 920 usleep_range(1000, 2000); /* 500us abs min. */ 921 } 922 923 lp5523_write(client, LP5523_REG_RESET, 0xff); 924 usleep_range(10000, 20000); /* 925 * Exact value is not available. 10 - 20ms 926 * appears to be enough for reset. 927 */ 928 ret = lp5523_detect(client); 929 if (ret) 930 goto fail1; 931 932 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 933 934 /* Initialize engines */ 935 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { 936 ret = lp5523_init_engine(&chip->engines[i], i + 1); 937 if (ret) { 938 dev_err(&client->dev, "error initializing engine\n"); 939 goto fail1; 940 } 941 } 942 ret = lp5523_configure(client); 943 if (ret < 0) { 944 dev_err(&client->dev, "error configuring chip\n"); 945 goto fail1; 946 } 947 948 /* Initialize leds */ 949 chip->num_channels = pdata->num_channels; 950 chip->num_leds = 0; 951 led = 0; 952 for (i = 0; i < pdata->num_channels; i++) { 953 /* Do not initialize channels that are not connected */ 954 if (pdata->led_config[i].led_current == 0) 955 continue; 956 957 INIT_WORK(&chip->leds[led].brightness_work, 958 lp5523_led_brightness_work); 959 960 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata, 961 id->name); 962 if (ret) { 963 dev_err(&client->dev, "error initializing leds\n"); 964 goto fail2; 965 } 966 chip->num_leds++; 967 968 chip->leds[led].id = led; 969 /* Set LED current */ 970 lp5523_write(client, 971 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, 972 chip->leds[led].led_current); 973 974 led++; 975 } 976 977 ret = lp5523_register_sysfs(client); 978 if (ret) { 979 dev_err(&client->dev, "registering sysfs failed\n"); 980 goto fail2; 981 } 982 return ret; 983 fail2: 984 for (i = 0; i < chip->num_leds; i++) { 985 led_classdev_unregister(&chip->leds[i].cdev); 986 flush_work(&chip->leds[i].brightness_work); 987 } 988 fail1: 989 if (pdata->enable) 990 pdata->enable(0); 991 if (pdata->release_resources) 992 pdata->release_resources(); 993 return ret; 994 } 995 996 static int lp5523_remove(struct i2c_client *client) 997 { 998 struct lp5523_chip *chip = i2c_get_clientdata(client); 999 int i; 1000 1001 /* Disable engine mode */ 1002 lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); 1003 1004 lp5523_unregister_sysfs(client); 1005 1006 for (i = 0; i < chip->num_leds; i++) { 1007 led_classdev_unregister(&chip->leds[i].cdev); 1008 flush_work(&chip->leds[i].brightness_work); 1009 } 1010 1011 if (chip->pdata->enable) 1012 chip->pdata->enable(0); 1013 if (chip->pdata->release_resources) 1014 chip->pdata->release_resources(); 1015 return 0; 1016 } 1017 1018 static const struct i2c_device_id lp5523_id[] = { 1019 { "lp5523", LP5523 }, 1020 { "lp55231", LP55231 }, 1021 { } 1022 }; 1023 1024 MODULE_DEVICE_TABLE(i2c, lp5523_id); 1025 1026 static struct i2c_driver lp5523_driver = { 1027 .driver = { 1028 .name = "lp5523x", 1029 }, 1030 .probe = lp5523_probe, 1031 .remove = lp5523_remove, 1032 .id_table = lp5523_id, 1033 }; 1034 1035 module_i2c_driver(lp5523_driver); 1036 1037 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 1038 MODULE_DESCRIPTION("LP5523 LED engine"); 1039 MODULE_LICENSE("GPL"); 1040