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 #include <linux/platform_data/leds-lp55xx.h> 38 39 #include "leds-lp55xx-common.h" 40 41 #define LP5523_REG_ENABLE 0x00 42 #define LP5523_REG_OP_MODE 0x01 43 #define LP5523_REG_RATIOMETRIC_MSB 0x02 44 #define LP5523_REG_RATIOMETRIC_LSB 0x03 45 #define LP5523_REG_ENABLE_LEDS_MSB 0x04 46 #define LP5523_REG_ENABLE_LEDS_LSB 0x05 47 #define LP5523_REG_LED_CNTRL_BASE 0x06 48 #define LP5523_REG_LED_PWM_BASE 0x16 49 #define LP5523_REG_LED_CURRENT_BASE 0x26 50 #define LP5523_REG_CONFIG 0x36 51 #define LP5523_REG_CHANNEL1_PC 0x37 52 #define LP5523_REG_CHANNEL2_PC 0x38 53 #define LP5523_REG_CHANNEL3_PC 0x39 54 #define LP5523_REG_STATUS 0x3a 55 #define LP5523_REG_GPO 0x3b 56 #define LP5523_REG_VARIABLE 0x3c 57 #define LP5523_REG_RESET 0x3d 58 #define LP5523_REG_TEMP_CTRL 0x3e 59 #define LP5523_REG_TEMP_READ 0x3f 60 #define LP5523_REG_TEMP_WRITE 0x40 61 #define LP5523_REG_LED_TEST_CTRL 0x41 62 #define LP5523_REG_LED_TEST_ADC 0x42 63 #define LP5523_REG_ENG1_VARIABLE 0x45 64 #define LP5523_REG_ENG2_VARIABLE 0x46 65 #define LP5523_REG_ENG3_VARIABLE 0x47 66 #define LP5523_REG_MASTER_FADER1 0x48 67 #define LP5523_REG_MASTER_FADER2 0x49 68 #define LP5523_REG_MASTER_FADER3 0x4a 69 #define LP5523_REG_CH1_PROG_START 0x4c 70 #define LP5523_REG_CH2_PROG_START 0x4d 71 #define LP5523_REG_CH3_PROG_START 0x4e 72 #define LP5523_REG_PROG_PAGE_SEL 0x4f 73 #define LP5523_REG_PROG_MEM 0x50 74 75 #define LP5523_CMD_LOAD 0x15 /* 00010101 */ 76 #define LP5523_CMD_RUN 0x2a /* 00101010 */ 77 #define LP5523_CMD_DISABLED 0x00 /* 00000000 */ 78 79 #define LP5523_ENABLE 0x40 80 #define LP5523_AUTO_INC 0x40 81 #define LP5523_PWR_SAVE 0x20 82 #define LP5523_PWM_PWR_SAVE 0x04 83 #define LP5523_CP_1 0x08 84 #define LP5523_CP_1_5 0x10 85 #define LP5523_CP_AUTO 0x18 86 #define LP5523_INT_CLK 0x01 87 #define LP5523_AUTO_CLK 0x02 88 #define LP5523_EN_LEDTEST 0x80 89 #define LP5523_LEDTEST_DONE 0x80 90 #define LP5523_RESET 0xFF 91 92 #define LP5523_DEFAULT_CURRENT 50 /* microAmps */ 93 #define LP5523_PROGRAM_LENGTH 32 /* in bytes */ 94 #define LP5523_PROGRAM_PAGES 6 95 #define LP5523_ADC_SHORTCIRC_LIM 80 96 97 #define LP5523_LEDS 9 98 #define LP5523_ENGINES 3 99 100 #define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */ 101 102 #define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */ 103 104 #define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING 105 106 #define LP5523_EXT_CLK_USED 0x08 107 108 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) 109 #define SHIFT_MASK(id) (((id) - 1) * 2) 110 111 enum lp5523_chip_id { 112 LP5523, 113 LP55231, 114 }; 115 116 struct lp5523_engine { 117 int id; 118 u8 mode; 119 u8 prog_page; 120 u8 mux_page; 121 u16 led_mux; 122 u8 engine_mask; 123 }; 124 125 struct lp5523_led { 126 int id; 127 u8 chan_nr; 128 u8 led_current; 129 u8 max_current; 130 struct led_classdev cdev; 131 struct work_struct brightness_work; 132 u8 brightness; 133 }; 134 135 struct lp5523_chip { 136 struct mutex lock; /* Serialize control */ 137 struct i2c_client *client; 138 struct lp5523_engine engines[LP5523_ENGINES]; 139 struct lp5523_led leds[LP5523_LEDS]; 140 struct lp5523_platform_data *pdata; 141 u8 num_channels; 142 u8 num_leds; 143 }; 144 145 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev) 146 { 147 return container_of(cdev, struct lp5523_led, cdev); 148 } 149 150 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine) 151 { 152 return container_of(engine, struct lp5523_chip, 153 engines[engine->id - 1]); 154 } 155 156 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led) 157 { 158 return container_of(led, struct lp5523_chip, 159 leds[led->id]); 160 } 161 162 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode); 163 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode); 164 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern); 165 166 static void lp5523_led_brightness_work(struct work_struct *work); 167 168 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value) 169 { 170 return i2c_smbus_write_byte_data(client, reg, value); 171 } 172 173 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf) 174 { 175 s32 ret = i2c_smbus_read_byte_data(client, reg); 176 177 if (ret < 0) 178 return ret; 179 180 *buf = ret; 181 return 0; 182 } 183 184 static int lp5523_post_init_device(struct lp55xx_chip *chip) 185 { 186 int ret; 187 188 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE); 189 if (ret) 190 return ret; 191 192 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 193 usleep_range(1000, 2000); 194 195 ret = lp55xx_write(chip, LP5523_REG_CONFIG, 196 LP5523_AUTO_INC | LP5523_PWR_SAVE | 197 LP5523_CP_AUTO | LP5523_AUTO_CLK | 198 LP5523_PWM_PWR_SAVE); 199 if (ret) 200 return ret; 201 202 /* turn on all leds */ 203 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 204 if (ret) 205 return ret; 206 207 return lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 208 } 209 210 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode) 211 { 212 struct lp5523_chip *chip = engine_to_lp5523(engine); 213 struct i2c_client *client = chip->client; 214 int ret; 215 u8 engine_state; 216 217 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state); 218 if (ret) 219 goto fail; 220 221 engine_state &= ~(engine->engine_mask); 222 223 /* set mode only for this engine */ 224 mode &= engine->engine_mask; 225 226 engine_state |= mode; 227 228 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state); 229 fail: 230 return ret; 231 } 232 233 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux) 234 { 235 struct lp5523_chip *chip = engine_to_lp5523(engine); 236 struct i2c_client *client = chip->client; 237 int ret = 0; 238 239 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 240 241 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page); 242 ret |= lp5523_write(client, LP5523_REG_PROG_MEM, 243 (u8)(mux >> 8)); 244 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 245 engine->led_mux = mux; 246 247 return ret; 248 } 249 250 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern) 251 { 252 struct lp5523_chip *chip = engine_to_lp5523(engine); 253 struct i2c_client *client = chip->client; 254 255 int ret = 0; 256 257 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 258 259 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, 260 engine->prog_page); 261 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM, 262 LP5523_PROGRAM_LENGTH, pattern); 263 264 return ret; 265 } 266 267 static int lp5523_run_program(struct lp5523_engine *engine) 268 { 269 struct lp5523_chip *chip = engine_to_lp5523(engine); 270 struct i2c_client *client = chip->client; 271 int ret; 272 273 ret = lp5523_write(client, LP5523_REG_ENABLE, 274 LP5523_CMD_RUN | LP5523_ENABLE); 275 if (ret) 276 goto fail; 277 278 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN); 279 fail: 280 return ret; 281 } 282 283 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 284 { 285 int i; 286 u16 tmp_mux = 0; 287 288 len = min_t(int, len, LP5523_LEDS); 289 for (i = 0; i < len; i++) { 290 switch (buf[i]) { 291 case '1': 292 tmp_mux |= (1 << i); 293 break; 294 case '0': 295 break; 296 case '\n': 297 i = len; 298 break; 299 default: 300 return -1; 301 } 302 } 303 *mux = tmp_mux; 304 305 return 0; 306 } 307 308 static void lp5523_mux_to_array(u16 led_mux, char *array) 309 { 310 int i, pos = 0; 311 for (i = 0; i < LP5523_LEDS; i++) 312 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 313 314 array[pos] = '\0'; 315 } 316 317 /*--------------------------------------------------------------*/ 318 /* Sysfs interface */ 319 /*--------------------------------------------------------------*/ 320 321 static ssize_t show_engine_leds(struct device *dev, 322 struct device_attribute *attr, 323 char *buf, int nr) 324 { 325 struct i2c_client *client = to_i2c_client(dev); 326 struct lp5523_chip *chip = i2c_get_clientdata(client); 327 char mux[LP5523_LEDS + 1]; 328 329 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 330 331 return sprintf(buf, "%s\n", mux); 332 } 333 334 #define show_leds(nr) \ 335 static ssize_t show_engine##nr##_leds(struct device *dev, \ 336 struct device_attribute *attr, \ 337 char *buf) \ 338 { \ 339 return show_engine_leds(dev, attr, buf, nr); \ 340 } 341 show_leds(1) 342 show_leds(2) 343 show_leds(3) 344 345 static ssize_t store_engine_leds(struct device *dev, 346 struct device_attribute *attr, 347 const char *buf, size_t len, int nr) 348 { 349 struct i2c_client *client = to_i2c_client(dev); 350 struct lp5523_chip *chip = i2c_get_clientdata(client); 351 u16 mux = 0; 352 ssize_t ret; 353 354 if (lp5523_mux_parse(buf, &mux, len)) 355 return -EINVAL; 356 357 mutex_lock(&chip->lock); 358 ret = -EINVAL; 359 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD) 360 goto leave; 361 362 if (lp5523_load_mux(&chip->engines[nr - 1], mux)) 363 goto leave; 364 365 ret = len; 366 leave: 367 mutex_unlock(&chip->lock); 368 return ret; 369 } 370 371 #define store_leds(nr) \ 372 static ssize_t store_engine##nr##_leds(struct device *dev, \ 373 struct device_attribute *attr, \ 374 const char *buf, size_t len) \ 375 { \ 376 return store_engine_leds(dev, attr, buf, len, nr); \ 377 } 378 store_leds(1) 379 store_leds(2) 380 store_leds(3) 381 382 static ssize_t lp5523_selftest(struct device *dev, 383 struct device_attribute *attr, 384 char *buf) 385 { 386 struct i2c_client *client = to_i2c_client(dev); 387 struct lp5523_chip *chip = i2c_get_clientdata(client); 388 int i, ret, pos = 0; 389 int led = 0; 390 u8 status, adc, vdd; 391 392 mutex_lock(&chip->lock); 393 394 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 395 if (ret < 0) 396 goto fail; 397 398 /* Check that ext clock is really in use if requested */ 399 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) 400 if ((status & LP5523_EXT_CLK_USED) == 0) 401 goto fail; 402 403 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 404 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, 405 LP5523_EN_LEDTEST | 16); 406 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 407 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 408 if (ret < 0) 409 goto fail; 410 411 if (!(status & LP5523_LEDTEST_DONE)) 412 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 413 414 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); 415 if (ret < 0) 416 goto fail; 417 418 vdd--; /* There may be some fluctuation in measurement */ 419 420 for (i = 0; i < LP5523_LEDS; i++) { 421 /* Skip non-existing channels */ 422 if (chip->pdata->led_config[i].led_current == 0) 423 continue; 424 425 /* Set default current */ 426 lp5523_write(chip->client, 427 LP5523_REG_LED_CURRENT_BASE + i, 428 chip->pdata->led_config[i].led_current); 429 430 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); 431 /* let current stabilize 2 - 4ms before measurements start */ 432 usleep_range(2000, 4000); 433 lp5523_write(chip->client, 434 LP5523_REG_LED_TEST_CTRL, 435 LP5523_EN_LEDTEST | i); 436 /* ADC conversion time is 2.7 ms typically */ 437 usleep_range(3000, 6000); 438 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 439 if (ret < 0) 440 goto fail; 441 442 if (!(status & LP5523_LEDTEST_DONE)) 443 usleep_range(3000, 6000);/* Was not ready. Wait. */ 444 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); 445 if (ret < 0) 446 goto fail; 447 448 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 449 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 450 451 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); 452 453 /* Restore current */ 454 lp5523_write(chip->client, 455 LP5523_REG_LED_CURRENT_BASE + i, 456 chip->leds[led].led_current); 457 led++; 458 } 459 if (pos == 0) 460 pos = sprintf(buf, "OK\n"); 461 goto release_lock; 462 fail: 463 pos = sprintf(buf, "FAIL\n"); 464 465 release_lock: 466 mutex_unlock(&chip->lock); 467 468 return pos; 469 } 470 471 static void lp5523_set_brightness(struct led_classdev *cdev, 472 enum led_brightness brightness) 473 { 474 struct lp5523_led *led = cdev_to_led(cdev); 475 476 led->brightness = (u8)brightness; 477 478 schedule_work(&led->brightness_work); 479 } 480 481 static void lp5523_led_brightness_work(struct work_struct *work) 482 { 483 struct lp5523_led *led = container_of(work, 484 struct lp5523_led, 485 brightness_work); 486 struct lp5523_chip *chip = led_to_lp5523(led); 487 struct i2c_client *client = chip->client; 488 489 mutex_lock(&chip->lock); 490 491 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, 492 led->brightness); 493 494 mutex_unlock(&chip->lock); 495 } 496 497 static int lp5523_do_store_load(struct lp5523_engine *engine, 498 const char *buf, size_t len) 499 { 500 struct lp5523_chip *chip = engine_to_lp5523(engine); 501 struct i2c_client *client = chip->client; 502 int ret, nrchars, offset = 0, i = 0; 503 char c[3]; 504 unsigned cmd; 505 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 506 507 if (engine->mode != LP5523_CMD_LOAD) 508 return -EINVAL; 509 510 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { 511 /* separate sscanfs because length is working only for %s */ 512 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); 513 ret = sscanf(c, "%2x", &cmd); 514 if (ret != 1) 515 goto fail; 516 pattern[i] = (u8)cmd; 517 518 offset += nrchars; 519 i++; 520 } 521 522 /* Each instruction is 16bit long. Check that length is even */ 523 if (i % 2) 524 goto fail; 525 526 mutex_lock(&chip->lock); 527 ret = lp5523_load_program(engine, pattern); 528 mutex_unlock(&chip->lock); 529 530 if (ret) { 531 dev_err(&client->dev, "failed loading pattern\n"); 532 return ret; 533 } 534 535 return len; 536 fail: 537 dev_err(&client->dev, "wrong pattern format\n"); 538 return -EINVAL; 539 } 540 541 static ssize_t store_engine_load(struct device *dev, 542 struct device_attribute *attr, 543 const char *buf, size_t len, int nr) 544 { 545 struct i2c_client *client = to_i2c_client(dev); 546 struct lp5523_chip *chip = i2c_get_clientdata(client); 547 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); 548 } 549 550 #define store_load(nr) \ 551 static ssize_t store_engine##nr##_load(struct device *dev, \ 552 struct device_attribute *attr, \ 553 const char *buf, size_t len) \ 554 { \ 555 return store_engine_load(dev, attr, buf, len, nr); \ 556 } 557 store_load(1) 558 store_load(2) 559 store_load(3) 560 561 static ssize_t show_engine_mode(struct device *dev, 562 struct device_attribute *attr, 563 char *buf, int nr) 564 { 565 struct i2c_client *client = to_i2c_client(dev); 566 struct lp5523_chip *chip = i2c_get_clientdata(client); 567 switch (chip->engines[nr - 1].mode) { 568 case LP5523_CMD_RUN: 569 return sprintf(buf, "run\n"); 570 case LP5523_CMD_LOAD: 571 return sprintf(buf, "load\n"); 572 case LP5523_CMD_DISABLED: 573 return sprintf(buf, "disabled\n"); 574 default: 575 return sprintf(buf, "disabled\n"); 576 } 577 } 578 579 #define show_mode(nr) \ 580 static ssize_t show_engine##nr##_mode(struct device *dev, \ 581 struct device_attribute *attr, \ 582 char *buf) \ 583 { \ 584 return show_engine_mode(dev, attr, buf, nr); \ 585 } 586 show_mode(1) 587 show_mode(2) 588 show_mode(3) 589 590 static ssize_t store_engine_mode(struct device *dev, 591 struct device_attribute *attr, 592 const char *buf, size_t len, int nr) 593 { 594 struct i2c_client *client = to_i2c_client(dev); 595 struct lp5523_chip *chip = i2c_get_clientdata(client); 596 struct lp5523_engine *engine = &chip->engines[nr - 1]; 597 mutex_lock(&chip->lock); 598 599 if (!strncmp(buf, "run", 3)) 600 lp5523_set_mode(engine, LP5523_CMD_RUN); 601 else if (!strncmp(buf, "load", 4)) 602 lp5523_set_mode(engine, LP5523_CMD_LOAD); 603 else if (!strncmp(buf, "disabled", 8)) 604 lp5523_set_mode(engine, LP5523_CMD_DISABLED); 605 606 mutex_unlock(&chip->lock); 607 return len; 608 } 609 610 #define store_mode(nr) \ 611 static ssize_t store_engine##nr##_mode(struct device *dev, \ 612 struct device_attribute *attr, \ 613 const char *buf, size_t len) \ 614 { \ 615 return store_engine_mode(dev, attr, buf, len, nr); \ 616 } 617 store_mode(1) 618 store_mode(2) 619 store_mode(3) 620 621 static ssize_t show_max_current(struct device *dev, 622 struct device_attribute *attr, 623 char *buf) 624 { 625 struct led_classdev *led_cdev = dev_get_drvdata(dev); 626 struct lp5523_led *led = cdev_to_led(led_cdev); 627 628 return sprintf(buf, "%d\n", led->max_current); 629 } 630 631 static ssize_t show_current(struct device *dev, 632 struct device_attribute *attr, 633 char *buf) 634 { 635 struct led_classdev *led_cdev = dev_get_drvdata(dev); 636 struct lp5523_led *led = cdev_to_led(led_cdev); 637 638 return sprintf(buf, "%d\n", led->led_current); 639 } 640 641 static ssize_t store_current(struct device *dev, 642 struct device_attribute *attr, 643 const char *buf, size_t len) 644 { 645 struct led_classdev *led_cdev = dev_get_drvdata(dev); 646 struct lp5523_led *led = cdev_to_led(led_cdev); 647 struct lp5523_chip *chip = led_to_lp5523(led); 648 ssize_t ret; 649 unsigned long curr; 650 651 if (kstrtoul(buf, 0, &curr)) 652 return -EINVAL; 653 654 if (curr > led->max_current) 655 return -EINVAL; 656 657 mutex_lock(&chip->lock); 658 ret = lp5523_write(chip->client, 659 LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 660 (u8)curr); 661 mutex_unlock(&chip->lock); 662 663 if (ret < 0) 664 return ret; 665 666 led->led_current = (u8)curr; 667 668 return len; 669 } 670 671 /* led class device attributes */ 672 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); 673 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); 674 675 static struct attribute *lp5523_led_attributes[] = { 676 &dev_attr_led_current.attr, 677 &dev_attr_max_current.attr, 678 NULL, 679 }; 680 681 static struct attribute_group lp5523_led_attribute_group = { 682 .attrs = lp5523_led_attributes 683 }; 684 685 /* device attributes */ 686 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, 687 show_engine1_mode, store_engine1_mode); 688 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, 689 show_engine2_mode, store_engine2_mode); 690 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, 691 show_engine3_mode, store_engine3_mode); 692 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR, 693 show_engine1_leds, store_engine1_leds); 694 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR, 695 show_engine2_leds, store_engine2_leds); 696 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR, 697 show_engine3_leds, store_engine3_leds); 698 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); 699 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); 700 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); 701 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); 702 703 static struct attribute *lp5523_attributes[] = { 704 &dev_attr_engine1_mode.attr, 705 &dev_attr_engine2_mode.attr, 706 &dev_attr_engine3_mode.attr, 707 &dev_attr_selftest.attr, 708 &dev_attr_engine1_load.attr, 709 &dev_attr_engine1_leds.attr, 710 &dev_attr_engine2_load.attr, 711 &dev_attr_engine2_leds.attr, 712 &dev_attr_engine3_load.attr, 713 &dev_attr_engine3_leds.attr, 714 NULL, 715 }; 716 717 static const struct attribute_group lp5523_group = { 718 .attrs = lp5523_attributes, 719 }; 720 721 static int lp5523_register_sysfs(struct i2c_client *client) 722 { 723 struct device *dev = &client->dev; 724 int ret; 725 726 ret = sysfs_create_group(&dev->kobj, &lp5523_group); 727 if (ret < 0) 728 return ret; 729 730 return 0; 731 } 732 733 static void lp5523_unregister_sysfs(struct i2c_client *client) 734 { 735 struct lp5523_chip *chip = i2c_get_clientdata(client); 736 struct device *dev = &client->dev; 737 int i; 738 739 sysfs_remove_group(&dev->kobj, &lp5523_group); 740 741 for (i = 0; i < chip->num_leds; i++) 742 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, 743 &lp5523_led_attribute_group); 744 } 745 746 /*--------------------------------------------------------------*/ 747 /* Set chip operating mode */ 748 /*--------------------------------------------------------------*/ 749 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode) 750 { 751 /* if in that mode already do nothing, except for run */ 752 if (mode == engine->mode && mode != LP5523_CMD_RUN) 753 return; 754 755 switch (mode) { 756 case LP5523_CMD_RUN: 757 lp5523_run_program(engine); 758 break; 759 case LP5523_CMD_LOAD: 760 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); 761 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 762 break; 763 case LP5523_CMD_DISABLED: 764 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); 765 break; 766 default: 767 return; 768 } 769 770 engine->mode = mode; 771 } 772 773 /*--------------------------------------------------------------*/ 774 /* Probe, Attach, Remove */ 775 /*--------------------------------------------------------------*/ 776 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) 777 { 778 if (id < 1 || id > LP5523_ENGINES) 779 return -1; 780 engine->id = id; 781 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); 782 engine->prog_page = id - 1; 783 engine->mux_page = id + 2; 784 785 return 0; 786 } 787 788 static int lp5523_init_led(struct lp5523_led *led, struct device *dev, 789 int chan, struct lp5523_platform_data *pdata, 790 const char *chip_name) 791 { 792 char name[32]; 793 int res; 794 795 if (chan >= LP5523_LEDS) 796 return -EINVAL; 797 798 if (pdata->led_config[chan].led_current) { 799 led->led_current = pdata->led_config[chan].led_current; 800 led->max_current = pdata->led_config[chan].max_current; 801 led->chan_nr = pdata->led_config[chan].chan_nr; 802 803 if (led->chan_nr >= LP5523_LEDS) { 804 dev_err(dev, "Use channel numbers between 0 and %d\n", 805 LP5523_LEDS - 1); 806 return -EINVAL; 807 } 808 809 if (pdata->led_config[chan].name) { 810 led->cdev.name = pdata->led_config[chan].name; 811 } else { 812 snprintf(name, sizeof(name), "%s:channel%d", 813 pdata->label ? : chip_name, chan); 814 led->cdev.name = name; 815 } 816 817 led->cdev.brightness_set = lp5523_set_brightness; 818 res = led_classdev_register(dev, &led->cdev); 819 if (res < 0) { 820 dev_err(dev, "couldn't register led on channel %d\n", 821 chan); 822 return res; 823 } 824 res = sysfs_create_group(&led->cdev.dev->kobj, 825 &lp5523_led_attribute_group); 826 if (res < 0) { 827 dev_err(dev, "couldn't register current attribute\n"); 828 led_classdev_unregister(&led->cdev); 829 return res; 830 } 831 } else { 832 led->led_current = 0; 833 } 834 return 0; 835 } 836 837 static int lp5523_register_leds(struct lp5523_chip *chip, const char *name) 838 { 839 struct lp5523_platform_data *pdata = chip->pdata; 840 struct i2c_client *client = chip->client; 841 int i; 842 int led; 843 int ret; 844 845 /* Initialize leds */ 846 chip->num_channels = pdata->num_channels; 847 chip->num_leds = 0; 848 led = 0; 849 for (i = 0; i < pdata->num_channels; i++) { 850 /* Do not initialize channels that are not connected */ 851 if (pdata->led_config[i].led_current == 0) 852 continue; 853 854 INIT_WORK(&chip->leds[led].brightness_work, 855 lp5523_led_brightness_work); 856 857 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata, 858 name); 859 if (ret) { 860 dev_err(&client->dev, "error initializing leds\n"); 861 return ret; 862 } 863 chip->num_leds++; 864 865 chip->leds[led].id = led; 866 /* Set LED current */ 867 lp5523_write(client, 868 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, 869 chip->leds[led].led_current); 870 871 led++; 872 } 873 874 return 0; 875 } 876 877 static void lp5523_unregister_leds(struct lp5523_chip *chip) 878 { 879 int i; 880 881 for (i = 0; i < chip->num_leds; i++) { 882 led_classdev_unregister(&chip->leds[i].cdev); 883 flush_work(&chip->leds[i].brightness_work); 884 } 885 } 886 887 static void lp5523_deinit_device(struct lp5523_chip *chip); 888 static int lp5523_init_device(struct lp5523_chip *chip) 889 { 890 struct i2c_client *client = chip->client; 891 struct lp55xx_chip *temp; 892 int ret; 893 894 ret = lp5523_post_init_device(temp); 895 if (ret < 0) { 896 dev_err(&client->dev, "error configuring chip\n"); 897 goto err_config; 898 } 899 900 return 0; 901 902 err_config: 903 lp5523_deinit_device(chip); 904 return ret; 905 } 906 907 static void lp5523_deinit_device(struct lp5523_chip *chip) 908 { 909 struct lp5523_platform_data *pdata = chip->pdata; 910 911 if (pdata->enable) 912 pdata->enable(0); 913 if (pdata->release_resources) 914 pdata->release_resources(); 915 } 916 917 /* Chip specific configurations */ 918 static struct lp55xx_device_config lp5523_cfg = { 919 .reset = { 920 .addr = LP5523_REG_RESET, 921 .val = LP5523_RESET, 922 }, 923 .enable = { 924 .addr = LP5523_REG_ENABLE, 925 .val = LP5523_ENABLE, 926 }, 927 .post_init_device = lp5523_post_init_device, 928 }; 929 930 static int lp5523_probe(struct i2c_client *client, 931 const struct i2c_device_id *id) 932 { 933 struct lp5523_chip *old_chip = NULL; 934 int ret, i; 935 struct lp55xx_chip *chip; 936 struct lp55xx_led *led; 937 struct lp55xx_platform_data *pdata = client->dev.platform_data; 938 939 if (!pdata) { 940 dev_err(&client->dev, "no platform data\n"); 941 return -EINVAL; 942 } 943 944 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 945 if (!chip) 946 return -ENOMEM; 947 948 led = devm_kzalloc(&client->dev, 949 sizeof(*led) * pdata->num_channels, GFP_KERNEL); 950 if (!led) 951 return -ENOMEM; 952 953 chip->cl = client; 954 chip->pdata = pdata; 955 chip->cfg = &lp5523_cfg; 956 957 mutex_init(&chip->lock); 958 959 i2c_set_clientdata(client, led); 960 961 ret = lp5523_init_device(old_chip); 962 if (ret) 963 goto err_init; 964 965 dev_info(&client->dev, "%s Programmable led chip found\n", id->name); 966 967 /* Initialize engines */ 968 for (i = 0; i < ARRAY_SIZE(old_chip->engines); i++) { 969 ret = lp5523_init_engine(&old_chip->engines[i], i + 1); 970 if (ret) { 971 dev_err(&client->dev, "error initializing engine\n"); 972 goto fail1; 973 } 974 } 975 976 ret = lp5523_register_leds(old_chip, id->name); 977 if (ret) 978 goto fail2; 979 980 ret = lp5523_register_sysfs(client); 981 if (ret) { 982 dev_err(&client->dev, "registering sysfs failed\n"); 983 goto fail2; 984 } 985 return ret; 986 fail2: 987 lp5523_unregister_leds(old_chip); 988 fail1: 989 lp5523_deinit_device(old_chip); 990 err_init: 991 return ret; 992 } 993 994 static int lp5523_remove(struct i2c_client *client) 995 { 996 struct lp5523_chip *old_chip = i2c_get_clientdata(client); 997 998 /* Disable engine mode */ 999 lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); 1000 1001 lp5523_unregister_sysfs(client); 1002 1003 lp5523_unregister_leds(old_chip); 1004 1005 lp5523_deinit_device(old_chip); 1006 return 0; 1007 } 1008 1009 static const struct i2c_device_id lp5523_id[] = { 1010 { "lp5523", LP5523 }, 1011 { "lp55231", LP55231 }, 1012 { } 1013 }; 1014 1015 MODULE_DEVICE_TABLE(i2c, lp5523_id); 1016 1017 static struct i2c_driver lp5523_driver = { 1018 .driver = { 1019 .name = "lp5523x", 1020 }, 1021 .probe = lp5523_probe, 1022 .remove = lp5523_remove, 1023 .id_table = lp5523_id, 1024 }; 1025 1026 module_i2c_driver(lp5523_driver); 1027 1028 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 1029 MODULE_DESCRIPTION("LP5523 LED engine"); 1030 MODULE_LICENSE("GPL"); 1031