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 struct lp5523_engine { 108 int id; 109 u8 mode; 110 u8 prog_page; 111 u8 mux_page; 112 u16 led_mux; 113 u8 engine_mask; 114 }; 115 116 struct lp5523_led { 117 int id; 118 u8 chan_nr; 119 u8 led_current; 120 u8 max_current; 121 struct led_classdev cdev; 122 struct work_struct brightness_work; 123 u8 brightness; 124 }; 125 126 struct lp5523_chip { 127 struct mutex lock; /* Serialize control */ 128 struct i2c_client *client; 129 struct lp5523_engine engines[LP5523_ENGINES]; 130 struct lp5523_led leds[LP5523_LEDS]; 131 struct lp5523_platform_data *pdata; 132 u8 num_channels; 133 u8 num_leds; 134 }; 135 136 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev) 137 { 138 return container_of(cdev, struct lp5523_led, cdev); 139 } 140 141 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine) 142 { 143 return container_of(engine, struct lp5523_chip, 144 engines[engine->id - 1]); 145 } 146 147 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led) 148 { 149 return container_of(led, struct lp5523_chip, 150 leds[led->id]); 151 } 152 153 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode); 154 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode); 155 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern); 156 157 static void lp5523_led_brightness_work(struct work_struct *work); 158 159 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value) 160 { 161 return i2c_smbus_write_byte_data(client, reg, value); 162 } 163 164 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf) 165 { 166 s32 ret = i2c_smbus_read_byte_data(client, reg); 167 168 if (ret < 0) 169 return -EIO; 170 171 *buf = ret; 172 return 0; 173 } 174 175 static int lp5523_detect(struct i2c_client *client) 176 { 177 int ret; 178 u8 buf; 179 180 ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40); 181 if (ret) 182 return ret; 183 ret = lp5523_read(client, LP5523_REG_ENABLE, &buf); 184 if (ret) 185 return ret; 186 if (buf == 0x40) 187 return 0; 188 else 189 return -ENODEV; 190 } 191 192 static int lp5523_configure(struct i2c_client *client) 193 { 194 struct lp5523_chip *chip = i2c_get_clientdata(client); 195 int ret = 0; 196 u8 status; 197 198 /* one pattern per engine setting led mux start and stop addresses */ 199 u8 pattern[][LP5523_PROGRAM_LENGTH] = { 200 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, 201 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, 202 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, 203 }; 204 205 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); 206 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ 207 usleep_range(1000, 2000); 208 209 ret |= lp5523_write(client, LP5523_REG_CONFIG, 210 LP5523_AUTO_INC | LP5523_PWR_SAVE | 211 LP5523_CP_AUTO | LP5523_AUTO_CLK | 212 LP5523_PWM_PWR_SAVE); 213 214 /* turn on all leds */ 215 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01); 216 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff); 217 218 /* hardcode 32 bytes of memory for each engine from program memory */ 219 ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00); 220 ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10); 221 ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20); 222 223 /* write led mux address space for each channel */ 224 ret |= lp5523_load_program(&chip->engines[0], pattern[0]); 225 ret |= lp5523_load_program(&chip->engines[1], pattern[1]); 226 ret |= lp5523_load_program(&chip->engines[2], pattern[2]); 227 228 if (ret) { 229 dev_err(&client->dev, "could not load mux programs\n"); 230 return -1; 231 } 232 233 /* set all engines exec state and mode to run 00101010 */ 234 ret |= lp5523_write(client, LP5523_REG_ENABLE, 235 (LP5523_CMD_RUN | LP5523_ENABLE)); 236 237 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN); 238 239 if (ret) { 240 dev_err(&client->dev, "could not start mux programs\n"); 241 return -1; 242 } 243 244 /* Let the programs run for couple of ms and check the engine status */ 245 usleep_range(3000, 6000); 246 lp5523_read(client, LP5523_REG_STATUS, &status); 247 status &= LP5523_ENG_STATUS_MASK; 248 249 if (status == LP5523_ENG_STATUS_MASK) { 250 dev_dbg(&client->dev, "all engines configured\n"); 251 } else { 252 dev_info(&client->dev, "status == %x\n", status); 253 dev_err(&client->dev, "cound not configure LED engine\n"); 254 return -1; 255 } 256 257 dev_info(&client->dev, "disabling engines\n"); 258 259 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); 260 261 return ret; 262 } 263 264 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode) 265 { 266 struct lp5523_chip *chip = engine_to_lp5523(engine); 267 struct i2c_client *client = chip->client; 268 int ret; 269 u8 engine_state; 270 271 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state); 272 if (ret) 273 goto fail; 274 275 engine_state &= ~(engine->engine_mask); 276 277 /* set mode only for this engine */ 278 mode &= engine->engine_mask; 279 280 engine_state |= mode; 281 282 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state); 283 fail: 284 return ret; 285 } 286 287 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux) 288 { 289 struct lp5523_chip *chip = engine_to_lp5523(engine); 290 struct i2c_client *client = chip->client; 291 int ret = 0; 292 293 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 294 295 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page); 296 ret |= lp5523_write(client, LP5523_REG_PROG_MEM, 297 (u8)(mux >> 8)); 298 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux)); 299 engine->led_mux = mux; 300 301 return ret; 302 } 303 304 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern) 305 { 306 struct lp5523_chip *chip = engine_to_lp5523(engine); 307 struct i2c_client *client = chip->client; 308 309 int ret = 0; 310 311 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 312 313 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, 314 engine->prog_page); 315 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM, 316 LP5523_PROGRAM_LENGTH, pattern); 317 318 return ret; 319 } 320 321 static int lp5523_run_program(struct lp5523_engine *engine) 322 { 323 struct lp5523_chip *chip = engine_to_lp5523(engine); 324 struct i2c_client *client = chip->client; 325 int ret; 326 327 ret = lp5523_write(client, LP5523_REG_ENABLE, 328 LP5523_CMD_RUN | LP5523_ENABLE); 329 if (ret) 330 goto fail; 331 332 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN); 333 fail: 334 return ret; 335 } 336 337 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) 338 { 339 int i; 340 u16 tmp_mux = 0; 341 len = len < LP5523_LEDS ? len : LP5523_LEDS; 342 for (i = 0; i < len; i++) { 343 switch (buf[i]) { 344 case '1': 345 tmp_mux |= (1 << i); 346 break; 347 case '0': 348 break; 349 case '\n': 350 i = len; 351 break; 352 default: 353 return -1; 354 } 355 } 356 *mux = tmp_mux; 357 358 return 0; 359 } 360 361 static void lp5523_mux_to_array(u16 led_mux, char *array) 362 { 363 int i, pos = 0; 364 for (i = 0; i < LP5523_LEDS; i++) 365 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); 366 367 array[pos] = '\0'; 368 } 369 370 /*--------------------------------------------------------------*/ 371 /* Sysfs interface */ 372 /*--------------------------------------------------------------*/ 373 374 static ssize_t show_engine_leds(struct device *dev, 375 struct device_attribute *attr, 376 char *buf, int nr) 377 { 378 struct i2c_client *client = to_i2c_client(dev); 379 struct lp5523_chip *chip = i2c_get_clientdata(client); 380 char mux[LP5523_LEDS + 1]; 381 382 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); 383 384 return sprintf(buf, "%s\n", mux); 385 } 386 387 #define show_leds(nr) \ 388 static ssize_t show_engine##nr##_leds(struct device *dev, \ 389 struct device_attribute *attr, \ 390 char *buf) \ 391 { \ 392 return show_engine_leds(dev, attr, buf, nr); \ 393 } 394 show_leds(1) 395 show_leds(2) 396 show_leds(3) 397 398 static ssize_t store_engine_leds(struct device *dev, 399 struct device_attribute *attr, 400 const char *buf, size_t len, int nr) 401 { 402 struct i2c_client *client = to_i2c_client(dev); 403 struct lp5523_chip *chip = i2c_get_clientdata(client); 404 u16 mux = 0; 405 ssize_t ret; 406 407 if (lp5523_mux_parse(buf, &mux, len)) 408 return -EINVAL; 409 410 mutex_lock(&chip->lock); 411 ret = -EINVAL; 412 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD) 413 goto leave; 414 415 if (lp5523_load_mux(&chip->engines[nr - 1], mux)) 416 goto leave; 417 418 ret = len; 419 leave: 420 mutex_unlock(&chip->lock); 421 return ret; 422 } 423 424 #define store_leds(nr) \ 425 static ssize_t store_engine##nr##_leds(struct device *dev, \ 426 struct device_attribute *attr, \ 427 const char *buf, size_t len) \ 428 { \ 429 return store_engine_leds(dev, attr, buf, len, nr); \ 430 } 431 store_leds(1) 432 store_leds(2) 433 store_leds(3) 434 435 static ssize_t lp5523_selftest(struct device *dev, 436 struct device_attribute *attr, 437 char *buf) 438 { 439 struct i2c_client *client = to_i2c_client(dev); 440 struct lp5523_chip *chip = i2c_get_clientdata(client); 441 int i, ret, pos = 0; 442 int led = 0; 443 u8 status, adc, vdd; 444 445 mutex_lock(&chip->lock); 446 447 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 448 if (ret < 0) 449 goto fail; 450 451 /* Check that ext clock is really in use if requested */ 452 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) 453 if ((status & LP5523_EXT_CLK_USED) == 0) 454 goto fail; 455 456 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ 457 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, 458 LP5523_EN_LEDTEST | 16); 459 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ 460 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 461 if (!(status & LP5523_LEDTEST_DONE)) 462 usleep_range(3000, 6000); /* Was not ready. Wait little bit */ 463 464 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); 465 vdd--; /* There may be some fluctuation in measurement */ 466 467 for (i = 0; i < LP5523_LEDS; i++) { 468 /* Skip non-existing channels */ 469 if (chip->pdata->led_config[i].led_current == 0) 470 continue; 471 472 /* Set default current */ 473 lp5523_write(chip->client, 474 LP5523_REG_LED_CURRENT_BASE + i, 475 chip->pdata->led_config[i].led_current); 476 477 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); 478 /* let current stabilize 2 - 4ms before measurements start */ 479 usleep_range(2000, 4000); 480 lp5523_write(chip->client, 481 LP5523_REG_LED_TEST_CTRL, 482 LP5523_EN_LEDTEST | i); 483 /* ADC conversion time is 2.7 ms typically */ 484 usleep_range(3000, 6000); 485 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); 486 if (!(status & LP5523_LEDTEST_DONE)) 487 usleep_range(3000, 6000);/* Was not ready. Wait. */ 488 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); 489 490 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) 491 pos += sprintf(buf + pos, "LED %d FAIL\n", i); 492 493 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); 494 495 /* Restore current */ 496 lp5523_write(chip->client, 497 LP5523_REG_LED_CURRENT_BASE + i, 498 chip->leds[led].led_current); 499 led++; 500 } 501 if (pos == 0) 502 pos = sprintf(buf, "OK\n"); 503 goto release_lock; 504 fail: 505 pos = sprintf(buf, "FAIL\n"); 506 507 release_lock: 508 mutex_unlock(&chip->lock); 509 510 return pos; 511 } 512 513 static void lp5523_set_brightness(struct led_classdev *cdev, 514 enum led_brightness brightness) 515 { 516 struct lp5523_led *led = cdev_to_led(cdev); 517 518 led->brightness = (u8)brightness; 519 520 schedule_work(&led->brightness_work); 521 } 522 523 static void lp5523_led_brightness_work(struct work_struct *work) 524 { 525 struct lp5523_led *led = container_of(work, 526 struct lp5523_led, 527 brightness_work); 528 struct lp5523_chip *chip = led_to_lp5523(led); 529 struct i2c_client *client = chip->client; 530 531 mutex_lock(&chip->lock); 532 533 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, 534 led->brightness); 535 536 mutex_unlock(&chip->lock); 537 } 538 539 static int lp5523_do_store_load(struct lp5523_engine *engine, 540 const char *buf, size_t len) 541 { 542 struct lp5523_chip *chip = engine_to_lp5523(engine); 543 struct i2c_client *client = chip->client; 544 int ret, nrchars, offset = 0, i = 0; 545 char c[3]; 546 unsigned cmd; 547 u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; 548 549 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { 550 /* separate sscanfs because length is working only for %s */ 551 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); 552 ret = sscanf(c, "%2x", &cmd); 553 if (ret != 1) 554 goto fail; 555 pattern[i] = (u8)cmd; 556 557 offset += nrchars; 558 i++; 559 } 560 561 /* Each instruction is 16bit long. Check that length is even */ 562 if (i % 2) 563 goto fail; 564 565 mutex_lock(&chip->lock); 566 567 if (engine->mode == LP5523_CMD_LOAD) 568 ret = lp5523_load_program(engine, pattern); 569 else 570 ret = -EINVAL; 571 572 mutex_unlock(&chip->lock); 573 574 if (ret) { 575 dev_err(&client->dev, "failed loading pattern\n"); 576 return ret; 577 } 578 579 return len; 580 fail: 581 dev_err(&client->dev, "wrong pattern format\n"); 582 return -EINVAL; 583 } 584 585 static ssize_t store_engine_load(struct device *dev, 586 struct device_attribute *attr, 587 const char *buf, size_t len, int nr) 588 { 589 struct i2c_client *client = to_i2c_client(dev); 590 struct lp5523_chip *chip = i2c_get_clientdata(client); 591 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); 592 } 593 594 #define store_load(nr) \ 595 static ssize_t store_engine##nr##_load(struct device *dev, \ 596 struct device_attribute *attr, \ 597 const char *buf, size_t len) \ 598 { \ 599 return store_engine_load(dev, attr, buf, len, nr); \ 600 } 601 store_load(1) 602 store_load(2) 603 store_load(3) 604 605 static ssize_t show_engine_mode(struct device *dev, 606 struct device_attribute *attr, 607 char *buf, int nr) 608 { 609 struct i2c_client *client = to_i2c_client(dev); 610 struct lp5523_chip *chip = i2c_get_clientdata(client); 611 switch (chip->engines[nr - 1].mode) { 612 case LP5523_CMD_RUN: 613 return sprintf(buf, "run\n"); 614 case LP5523_CMD_LOAD: 615 return sprintf(buf, "load\n"); 616 case LP5523_CMD_DISABLED: 617 return sprintf(buf, "disabled\n"); 618 default: 619 return sprintf(buf, "disabled\n"); 620 } 621 } 622 623 #define show_mode(nr) \ 624 static ssize_t show_engine##nr##_mode(struct device *dev, \ 625 struct device_attribute *attr, \ 626 char *buf) \ 627 { \ 628 return show_engine_mode(dev, attr, buf, nr); \ 629 } 630 show_mode(1) 631 show_mode(2) 632 show_mode(3) 633 634 static ssize_t store_engine_mode(struct device *dev, 635 struct device_attribute *attr, 636 const char *buf, size_t len, int nr) 637 { 638 struct i2c_client *client = to_i2c_client(dev); 639 struct lp5523_chip *chip = i2c_get_clientdata(client); 640 struct lp5523_engine *engine = &chip->engines[nr - 1]; 641 mutex_lock(&chip->lock); 642 643 if (!strncmp(buf, "run", 3)) 644 lp5523_set_mode(engine, LP5523_CMD_RUN); 645 else if (!strncmp(buf, "load", 4)) 646 lp5523_set_mode(engine, LP5523_CMD_LOAD); 647 else if (!strncmp(buf, "disabled", 8)) 648 lp5523_set_mode(engine, LP5523_CMD_DISABLED); 649 650 mutex_unlock(&chip->lock); 651 return len; 652 } 653 654 #define store_mode(nr) \ 655 static ssize_t store_engine##nr##_mode(struct device *dev, \ 656 struct device_attribute *attr, \ 657 const char *buf, size_t len) \ 658 { \ 659 return store_engine_mode(dev, attr, buf, len, nr); \ 660 } 661 store_mode(1) 662 store_mode(2) 663 store_mode(3) 664 665 static ssize_t show_max_current(struct device *dev, 666 struct device_attribute *attr, 667 char *buf) 668 { 669 struct led_classdev *led_cdev = dev_get_drvdata(dev); 670 struct lp5523_led *led = cdev_to_led(led_cdev); 671 672 return sprintf(buf, "%d\n", led->max_current); 673 } 674 675 static ssize_t show_current(struct device *dev, 676 struct device_attribute *attr, 677 char *buf) 678 { 679 struct led_classdev *led_cdev = dev_get_drvdata(dev); 680 struct lp5523_led *led = cdev_to_led(led_cdev); 681 682 return sprintf(buf, "%d\n", led->led_current); 683 } 684 685 static ssize_t store_current(struct device *dev, 686 struct device_attribute *attr, 687 const char *buf, size_t len) 688 { 689 struct led_classdev *led_cdev = dev_get_drvdata(dev); 690 struct lp5523_led *led = cdev_to_led(led_cdev); 691 struct lp5523_chip *chip = led_to_lp5523(led); 692 ssize_t ret; 693 unsigned long curr; 694 695 if (strict_strtoul(buf, 0, &curr)) 696 return -EINVAL; 697 698 if (curr > led->max_current) 699 return -EINVAL; 700 701 mutex_lock(&chip->lock); 702 ret = lp5523_write(chip->client, 703 LP5523_REG_LED_CURRENT_BASE + led->chan_nr, 704 (u8)curr); 705 mutex_unlock(&chip->lock); 706 707 if (ret < 0) 708 return ret; 709 710 led->led_current = (u8)curr; 711 712 return len; 713 } 714 715 /* led class device attributes */ 716 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); 717 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); 718 719 static struct attribute *lp5523_led_attributes[] = { 720 &dev_attr_led_current.attr, 721 &dev_attr_max_current.attr, 722 NULL, 723 }; 724 725 static struct attribute_group lp5523_led_attribute_group = { 726 .attrs = lp5523_led_attributes 727 }; 728 729 /* device attributes */ 730 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, 731 show_engine1_mode, store_engine1_mode); 732 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, 733 show_engine2_mode, store_engine2_mode); 734 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, 735 show_engine3_mode, store_engine3_mode); 736 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR, 737 show_engine1_leds, store_engine1_leds); 738 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR, 739 show_engine2_leds, store_engine2_leds); 740 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR, 741 show_engine3_leds, store_engine3_leds); 742 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); 743 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); 744 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); 745 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); 746 747 static struct attribute *lp5523_attributes[] = { 748 &dev_attr_engine1_mode.attr, 749 &dev_attr_engine2_mode.attr, 750 &dev_attr_engine3_mode.attr, 751 &dev_attr_selftest.attr, 752 &dev_attr_engine1_load.attr, 753 &dev_attr_engine1_leds.attr, 754 &dev_attr_engine2_load.attr, 755 &dev_attr_engine2_leds.attr, 756 &dev_attr_engine3_load.attr, 757 &dev_attr_engine3_leds.attr, 758 }; 759 760 static const struct attribute_group lp5523_group = { 761 .attrs = lp5523_attributes, 762 }; 763 764 static int lp5523_register_sysfs(struct i2c_client *client) 765 { 766 struct device *dev = &client->dev; 767 int ret; 768 769 ret = sysfs_create_group(&dev->kobj, &lp5523_group); 770 if (ret < 0) 771 return ret; 772 773 return 0; 774 } 775 776 static void lp5523_unregister_sysfs(struct i2c_client *client) 777 { 778 struct lp5523_chip *chip = i2c_get_clientdata(client); 779 struct device *dev = &client->dev; 780 int i; 781 782 sysfs_remove_group(&dev->kobj, &lp5523_group); 783 784 for (i = 0; i < chip->num_leds; i++) 785 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, 786 &lp5523_led_attribute_group); 787 } 788 789 /*--------------------------------------------------------------*/ 790 /* Set chip operating mode */ 791 /*--------------------------------------------------------------*/ 792 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode) 793 { 794 int ret = 0; 795 796 /* if in that mode already do nothing, except for run */ 797 if (mode == engine->mode && mode != LP5523_CMD_RUN) 798 return 0; 799 800 if (mode == LP5523_CMD_RUN) { 801 ret = lp5523_run_program(engine); 802 } else if (mode == LP5523_CMD_LOAD) { 803 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); 804 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); 805 } else if (mode == LP5523_CMD_DISABLED) { 806 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); 807 } 808 809 engine->mode = mode; 810 811 return ret; 812 } 813 814 /*--------------------------------------------------------------*/ 815 /* Probe, Attach, Remove */ 816 /*--------------------------------------------------------------*/ 817 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) 818 { 819 if (id < 1 || id > LP5523_ENGINES) 820 return -1; 821 engine->id = id; 822 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); 823 engine->prog_page = id - 1; 824 engine->mux_page = id + 2; 825 826 return 0; 827 } 828 829 static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev, 830 int chan, struct lp5523_platform_data *pdata) 831 { 832 char name[32]; 833 int res; 834 835 if (chan >= LP5523_LEDS) 836 return -EINVAL; 837 838 if (pdata->led_config[chan].led_current) { 839 led->led_current = pdata->led_config[chan].led_current; 840 led->max_current = pdata->led_config[chan].max_current; 841 led->chan_nr = pdata->led_config[chan].chan_nr; 842 843 if (led->chan_nr >= LP5523_LEDS) { 844 dev_err(dev, "Use channel numbers between 0 and %d\n", 845 LP5523_LEDS - 1); 846 return -EINVAL; 847 } 848 849 snprintf(name, sizeof(name), "%s:channel%d", 850 pdata->label ?: "lp5523", chan); 851 852 led->cdev.name = name; 853 led->cdev.brightness_set = lp5523_set_brightness; 854 res = led_classdev_register(dev, &led->cdev); 855 if (res < 0) { 856 dev_err(dev, "couldn't register led on channel %d\n", 857 chan); 858 return res; 859 } 860 res = sysfs_create_group(&led->cdev.dev->kobj, 861 &lp5523_led_attribute_group); 862 if (res < 0) { 863 dev_err(dev, "couldn't register current attribute\n"); 864 led_classdev_unregister(&led->cdev); 865 return res; 866 } 867 } else { 868 led->led_current = 0; 869 } 870 return 0; 871 } 872 873 static struct i2c_driver lp5523_driver; 874 875 static int __devinit lp5523_probe(struct i2c_client *client, 876 const struct i2c_device_id *id) 877 { 878 struct lp5523_chip *chip; 879 struct lp5523_platform_data *pdata; 880 int ret, i, led; 881 882 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 883 if (!chip) 884 return -ENOMEM; 885 886 i2c_set_clientdata(client, chip); 887 chip->client = client; 888 889 pdata = client->dev.platform_data; 890 891 if (!pdata) { 892 dev_err(&client->dev, "no platform data\n"); 893 ret = -EINVAL; 894 goto fail1; 895 } 896 897 mutex_init(&chip->lock); 898 899 chip->pdata = pdata; 900 901 if (pdata->setup_resources) { 902 ret = pdata->setup_resources(); 903 if (ret < 0) 904 goto fail1; 905 } 906 907 if (pdata->enable) { 908 pdata->enable(0); 909 usleep_range(1000, 2000); /* Keep enable down at least 1ms */ 910 pdata->enable(1); 911 usleep_range(1000, 2000); /* 500us abs min. */ 912 } 913 914 lp5523_write(client, LP5523_REG_RESET, 0xff); 915 usleep_range(10000, 20000); /* 916 * Exact value is not available. 10 - 20ms 917 * appears to be enough for reset. 918 */ 919 ret = lp5523_detect(client); 920 if (ret) 921 goto fail2; 922 923 dev_info(&client->dev, "LP5523 Programmable led chip found\n"); 924 925 /* Initialize engines */ 926 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { 927 ret = lp5523_init_engine(&chip->engines[i], i + 1); 928 if (ret) { 929 dev_err(&client->dev, "error initializing engine\n"); 930 goto fail2; 931 } 932 } 933 ret = lp5523_configure(client); 934 if (ret < 0) { 935 dev_err(&client->dev, "error configuring chip\n"); 936 goto fail2; 937 } 938 939 /* Initialize leds */ 940 chip->num_channels = pdata->num_channels; 941 chip->num_leds = 0; 942 led = 0; 943 for (i = 0; i < pdata->num_channels; i++) { 944 /* Do not initialize channels that are not connected */ 945 if (pdata->led_config[i].led_current == 0) 946 continue; 947 948 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata); 949 if (ret) { 950 dev_err(&client->dev, "error initializing leds\n"); 951 goto fail3; 952 } 953 chip->num_leds++; 954 955 chip->leds[led].id = led; 956 /* Set LED current */ 957 lp5523_write(client, 958 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, 959 chip->leds[led].led_current); 960 961 INIT_WORK(&(chip->leds[led].brightness_work), 962 lp5523_led_brightness_work); 963 964 led++; 965 } 966 967 ret = lp5523_register_sysfs(client); 968 if (ret) { 969 dev_err(&client->dev, "registering sysfs failed\n"); 970 goto fail3; 971 } 972 return ret; 973 fail3: 974 for (i = 0; i < chip->num_leds; i++) { 975 led_classdev_unregister(&chip->leds[i].cdev); 976 cancel_work_sync(&chip->leds[i].brightness_work); 977 } 978 fail2: 979 if (pdata->enable) 980 pdata->enable(0); 981 if (pdata->release_resources) 982 pdata->release_resources(); 983 fail1: 984 kfree(chip); 985 return ret; 986 } 987 988 static int lp5523_remove(struct i2c_client *client) 989 { 990 struct lp5523_chip *chip = i2c_get_clientdata(client); 991 int i; 992 993 lp5523_unregister_sysfs(client); 994 995 for (i = 0; i < chip->num_leds; i++) { 996 led_classdev_unregister(&chip->leds[i].cdev); 997 cancel_work_sync(&chip->leds[i].brightness_work); 998 } 999 1000 if (chip->pdata->enable) 1001 chip->pdata->enable(0); 1002 if (chip->pdata->release_resources) 1003 chip->pdata->release_resources(); 1004 kfree(chip); 1005 return 0; 1006 } 1007 1008 static const struct i2c_device_id lp5523_id[] = { 1009 { "lp5523", 0 }, 1010 { } 1011 }; 1012 1013 MODULE_DEVICE_TABLE(i2c, lp5523_id); 1014 1015 static struct i2c_driver lp5523_driver = { 1016 .driver = { 1017 .name = "lp5523", 1018 }, 1019 .probe = lp5523_probe, 1020 .remove = lp5523_remove, 1021 .id_table = lp5523_id, 1022 }; 1023 1024 static int __init lp5523_init(void) 1025 { 1026 int ret; 1027 1028 ret = i2c_add_driver(&lp5523_driver); 1029 1030 if (ret < 0) 1031 printk(KERN_ALERT "Adding lp5523 driver failed\n"); 1032 1033 return ret; 1034 } 1035 1036 static void __exit lp5523_exit(void) 1037 { 1038 i2c_del_driver(&lp5523_driver); 1039 } 1040 1041 module_init(lp5523_init); 1042 module_exit(lp5523_exit); 1043 1044 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); 1045 MODULE_DESCRIPTION("LP5523 LED engine"); 1046 MODULE_LICENSE("GPL"); 1047