drivers/leds/leds-lm3533.c

   1 /*
   2  * leds-lm3533.c -- LM3533 LED driver
   3  *
   4  * Copyright (C) 2011-2012 Texas Instruments
   5  *
   6  * Author: Johan Hovold <jhovold@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under  the terms of the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/leds.h>
  16 #include <linux/mfd/core.h>
  17 #include <linux/mutex.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20
  21 #include <linux/mfd/lm3533.h>
  22
  23
  24 #define LM3533_LVCTRLBANK_MIN           2
  25 #define LM3533_LVCTRLBANK_MAX           5
  26 #define LM3533_LVCTRLBANK_COUNT         4
  27 #define LM3533_RISEFALLTIME_MAX         7
  28 #define LM3533_ALS_CHANNEL_LV_MIN       1
  29 #define LM3533_ALS_CHANNEL_LV_MAX       2
  30
  31 #define LM3533_REG_CTRLBANK_BCONF_BASE          0x1b
  32 #define LM3533_REG_PATTERN_ENABLE               0x28
  33 #define LM3533_REG_PATTERN_LOW_TIME_BASE        0x71
  34 #define LM3533_REG_PATTERN_HIGH_TIME_BASE       0x72
  35 #define LM3533_REG_PATTERN_RISETIME_BASE        0x74
  36 #define LM3533_REG_PATTERN_FALLTIME_BASE        0x75
  37
  38 #define LM3533_REG_PATTERN_STEP                 0x10
  39
  40 #define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK          0x04
  41 #define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK           0x02
  42 #define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK      0x01
  43
  44 #define LM3533_LED_FLAG_PATTERN_ENABLE          1
  45
  46
  47 struct lm3533_led {
  48         struct lm3533 *lm3533;
  49         struct lm3533_ctrlbank cb;
  50         struct led_classdev cdev;
  51         int id;
  52
  53         struct mutex mutex;
  54         unsigned long flags;
  55 };
  56
  57
  58 static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
  59 {
  60         return container_of(cdev, struct lm3533_led, cdev);
  61 }
  62
  63 static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
  64 {
  65         return led->id + 2;
  66 }
  67
  68 static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
  69 {
  70         return base + led->id;
  71 }
  72
  73 static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
  74 {
  75         return led->id;
  76 }
  77
  78 static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
  79                                                                 u8 base)
  80 {
  81         return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
  82 }
  83
  84 static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
  85 {
  86         u8 mask;
  87         u8 val;
  88         int pattern;
  89         int state;
  90         int ret = 0;
  91
  92         dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
  93
  94         mutex_lock(&led->mutex);
  95
  96         state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
  97         if ((enable && state) || (!enable && !state))
  98                 goto out;
  99
 100         pattern = lm3533_led_get_pattern(led);
 101         mask = 1 << (2 * pattern);
 102
 103         if (enable)
 104                 val = mask;
 105         else
 106                 val = 0;
 107
 108         ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
 109         if (ret) {
 110                 dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
 111                                                         pattern, enable);
 112                 goto out;
 113         }
 114
 115         __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
 116 out:
 117         mutex_unlock(&led->mutex);
 118
 119         return ret;
 120 }
 121
 122 static int lm3533_led_set(struct led_classdev *cdev,
 123                                                 enum led_brightness value)
 124 {
 125         struct lm3533_led *led = to_lm3533_led(cdev);
 126
 127         dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
 128
 129         if (value == 0)
 130                 lm3533_led_pattern_enable(led, 0);      /* disable blink */
 131
 132         return lm3533_ctrlbank_set_brightness(&led->cb, value);
 133 }
 134
 135 static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
 136 {
 137         struct lm3533_led *led = to_lm3533_led(cdev);
 138         u8 val;
 139         int ret;
 140
 141         ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
 142         if (ret)
 143                 return ret;
 144
 145         dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
 146
 147         return val;
 148 }
 149
 150 /* Pattern generator defines (delays in us). */
 151 #define LM3533_LED_DELAY1_VMIN  0x00
 152 #define LM3533_LED_DELAY2_VMIN  0x3d
 153 #define LM3533_LED_DELAY3_VMIN  0x80
 154
 155 #define LM3533_LED_DELAY1_VMAX  (LM3533_LED_DELAY2_VMIN - 1)
 156 #define LM3533_LED_DELAY2_VMAX  (LM3533_LED_DELAY3_VMIN - 1)
 157 #define LM3533_LED_DELAY3_VMAX  0xff
 158
 159 #define LM3533_LED_DELAY1_TMIN  16384U
 160 #define LM3533_LED_DELAY2_TMIN  1130496U
 161 #define LM3533_LED_DELAY3_TMIN  10305536U
 162
 163 #define LM3533_LED_DELAY1_TMAX  999424U
 164 #define LM3533_LED_DELAY2_TMAX  9781248U
 165 #define LM3533_LED_DELAY3_TMAX  76890112U
 166
 167 /* t_step = (t_max - t_min) / (v_max - v_min) */
 168 #define LM3533_LED_DELAY1_TSTEP 16384
 169 #define LM3533_LED_DELAY2_TSTEP 131072
 170 #define LM3533_LED_DELAY3_TSTEP 524288
 171
 172 /* Delay limits for hardware accelerated blinking (in ms). */
 173 #define LM3533_LED_DELAY_ON_MAX \
 174         ((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
 175 #define LM3533_LED_DELAY_OFF_MAX \
 176         ((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
 177
 178 /*
 179  * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
 180  * size of t_step, where
 181  *
 182  *      t_step = (t_max - t_min) / (v_max - v_min)
 183  *
 184  * and updates *t to reflect the mapped value.
 185  */
 186 static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
 187                                                         u8 v_min, u8 v_max)
 188 {
 189         unsigned val;
 190
 191         val = (*t + t_step / 2 - t_min) / t_step + v_min;
 192
 193         *t = t_step * (val - v_min) + t_min;
 194
 195         return (u8)val;
 196 }
 197
 198 /*
 199  * Returns time code corresponding to *delay (in ms) and updates *delay to
 200  * reflect actual hardware delay.
 201  *
 202  * Hardware supports 256 discrete delay times, divided into three groups with
 203  * the following ranges and step-sizes:
 204  *
 205  *      [   16,   999]  [0x00, 0x3e]    step  16 ms
 206  *      [ 1130,  9781]  [0x3d, 0x7f]    step 131 ms
 207  *      [10306, 76890]  [0x80, 0xff]    step 524 ms
 208  *
 209  * Note that delay group 3 is only available for delay_off.
 210  */
 211 static u8 lm3533_led_get_hw_delay(unsigned *delay)
 212 {
 213         unsigned t;
 214         u8 val;
 215
 216         t = *delay * 1000;
 217
 218         if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
 219                 t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
 220                 val = time_to_val(&t,   LM3533_LED_DELAY3_TMIN,
 221                                         LM3533_LED_DELAY3_TSTEP,
 222                                         LM3533_LED_DELAY3_VMIN,
 223                                         LM3533_LED_DELAY3_VMAX);
 224         } else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
 225                 t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
 226                 val = time_to_val(&t,   LM3533_LED_DELAY2_TMIN,
 227                                         LM3533_LED_DELAY2_TSTEP,
 228                                         LM3533_LED_DELAY2_VMIN,
 229                                         LM3533_LED_DELAY2_VMAX);
 230         } else {
 231                 t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
 232                 val = time_to_val(&t,   LM3533_LED_DELAY1_TMIN,
 233                                         LM3533_LED_DELAY1_TSTEP,
 234                                         LM3533_LED_DELAY1_VMIN,
 235                                         LM3533_LED_DELAY1_VMAX);
 236         }
 237
 238         *delay = (t + 500) / 1000;
 239
 240         return val;
 241 }
 242
 243 /*
 244  * Set delay register base to *delay (in ms) and update *delay to reflect
 245  * actual hardware delay used.
 246  */
 247 static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
 248                                                         unsigned long *delay)
 249 {
 250         unsigned t;
 251         u8 val;
 252         u8 reg;
 253         int ret;
 254
 255         t = (unsigned)*delay;
 256
 257         /* Delay group 3 is only available for low time (delay off). */
 258         if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
 259                 t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
 260
 261         val = lm3533_led_get_hw_delay(&t);
 262
 263         dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
 264                                                         *delay, t, val);
 265         reg = lm3533_led_get_pattern_reg(led, base);
 266         ret = lm3533_write(led->lm3533, reg, val);
 267         if (ret)
 268                 dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
 269
 270         *delay = t;
 271
 272         return ret;
 273 }
 274
 275 static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
 276 {
 277         return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
 278 }
 279
 280 static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
 281 {
 282         return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
 283 }
 284
 285 static int lm3533_led_blink_set(struct led_classdev *cdev,
 286                                 unsigned long *delay_on,
 287                                 unsigned long *delay_off)
 288 {
 289         struct lm3533_led *led = to_lm3533_led(cdev);
 290         int ret;
 291
 292         dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
 293                                                         *delay_on, *delay_off);
 294
 295         if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
 296                                         *delay_off > LM3533_LED_DELAY_OFF_MAX)
 297                 return -EINVAL;
 298
 299         if (*delay_on == 0 && *delay_off == 0) {
 300                 *delay_on = 500;
 301                 *delay_off = 500;
 302         }
 303
 304         ret = lm3533_led_delay_on_set(led, delay_on);
 305         if (ret)
 306                 return ret;
 307
 308         ret = lm3533_led_delay_off_set(led, delay_off);
 309         if (ret)
 310                 return ret;
 311
 312         return lm3533_led_pattern_enable(led, 1);
 313 }
 314
 315 static ssize_t show_id(struct device *dev,
 316                                 struct device_attribute *attr, char *buf)
 317 {
 318         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 319         struct lm3533_led *led = to_lm3533_led(led_cdev);
 320
 321         return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
 322 }
 323
 324 /*
 325  * Pattern generator rise/fall times:
 326  *
 327  *   0 - 2048 us (default)
 328  *   1 - 262 ms
 329  *   2 - 524 ms
 330  *   3 - 1.049 s
 331  *   4 - 2.097 s
 332  *   5 - 4.194 s
 333  *   6 - 8.389 s
 334  *   7 - 16.78 s
 335  */
 336 static ssize_t show_risefalltime(struct device *dev,
 337                                         struct device_attribute *attr,
 338                                         char *buf, u8 base)
 339 {
 340         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 341         struct lm3533_led *led = to_lm3533_led(led_cdev);
 342         ssize_t ret;
 343         u8 reg;
 344         u8 val;
 345
 346         reg = lm3533_led_get_pattern_reg(led, base);
 347         ret = lm3533_read(led->lm3533, reg, &val);
 348         if (ret)
 349                 return ret;
 350
 351         return scnprintf(buf, PAGE_SIZE, "%x\n", val);
 352 }
 353
 354 static ssize_t show_risetime(struct device *dev,
 355                                 struct device_attribute *attr, char *buf)
 356 {
 357         return show_risefalltime(dev, attr, buf,
 358                                         LM3533_REG_PATTERN_RISETIME_BASE);
 359 }
 360
 361 static ssize_t show_falltime(struct device *dev,
 362                                 struct device_attribute *attr, char *buf)
 363 {
 364         return show_risefalltime(dev, attr, buf,
 365                                         LM3533_REG_PATTERN_FALLTIME_BASE);
 366 }
 367
 368 static ssize_t store_risefalltime(struct device *dev,
 369                                         struct device_attribute *attr,
 370                                         const char *buf, size_t len, u8 base)
 371 {
 372         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 373         struct lm3533_led *led = to_lm3533_led(led_cdev);
 374         u8 val;
 375         u8 reg;
 376         int ret;
 377
 378         if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
 379                 return -EINVAL;
 380
 381         reg = lm3533_led_get_pattern_reg(led, base);
 382         ret = lm3533_write(led->lm3533, reg, val);
 383         if (ret)
 384                 return ret;
 385
 386         return len;
 387 }
 388
 389 static ssize_t store_risetime(struct device *dev,
 390                                         struct device_attribute *attr,
 391                                         const char *buf, size_t len)
 392 {
 393         return store_risefalltime(dev, attr, buf, len,
 394                                         LM3533_REG_PATTERN_RISETIME_BASE);
 395 }
 396
 397 static ssize_t store_falltime(struct device *dev,
 398                                         struct device_attribute *attr,
 399                                         const char *buf, size_t len)
 400 {
 401         return store_risefalltime(dev, attr, buf, len,
 402                                         LM3533_REG_PATTERN_FALLTIME_BASE);
 403 }
 404
 405 static ssize_t show_als_channel(struct device *dev,
 406                                 struct device_attribute *attr, char *buf)
 407 {
 408         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 409         struct lm3533_led *led = to_lm3533_led(led_cdev);
 410         unsigned channel;
 411         u8 reg;
 412         u8 val;
 413         int ret;
 414
 415         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 416         ret = lm3533_read(led->lm3533, reg, &val);
 417         if (ret)
 418                 return ret;
 419
 420         channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
 421
 422         return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
 423 }
 424
 425 static ssize_t store_als_channel(struct device *dev,
 426                                         struct device_attribute *attr,
 427                                         const char *buf, size_t len)
 428 {
 429         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 430         struct lm3533_led *led = to_lm3533_led(led_cdev);
 431         unsigned channel;
 432         u8 reg;
 433         u8 val;
 434         u8 mask;
 435         int ret;
 436
 437         if (kstrtouint(buf, 0, &channel))
 438                 return -EINVAL;
 439
 440         if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
 441                                         channel > LM3533_ALS_CHANNEL_LV_MAX)
 442                 return -EINVAL;
 443
 444         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 445         mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
 446         val = channel - 1;
 447
 448         ret = lm3533_update(led->lm3533, reg, val, mask);
 449         if (ret)
 450                 return ret;
 451
 452         return len;
 453 }
 454
 455 static ssize_t show_als_en(struct device *dev,
 456                                 struct device_attribute *attr, char *buf)
 457 {
 458         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 459         struct lm3533_led *led = to_lm3533_led(led_cdev);
 460         bool enable;
 461         u8 reg;
 462         u8 val;
 463         int ret;
 464
 465         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 466         ret = lm3533_read(led->lm3533, reg, &val);
 467         if (ret)
 468                 return ret;
 469
 470         enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
 471
 472         return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
 473 }
 474
 475 static ssize_t store_als_en(struct device *dev,
 476                                         struct device_attribute *attr,
 477                                         const char *buf, size_t len)
 478 {
 479         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 480         struct lm3533_led *led = to_lm3533_led(led_cdev);
 481         unsigned enable;
 482         u8 reg;
 483         u8 mask;
 484         u8 val;
 485         int ret;
 486
 487         if (kstrtouint(buf, 0, &enable))
 488                 return -EINVAL;
 489
 490         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 491         mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
 492
 493         if (enable)
 494                 val = mask;
 495         else
 496                 val = 0;
 497
 498         ret = lm3533_update(led->lm3533, reg, val, mask);
 499         if (ret)
 500                 return ret;
 501
 502         return len;
 503 }
 504
 505 static ssize_t show_linear(struct device *dev,
 506                                 struct device_attribute *attr, char *buf)
 507 {
 508         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 509         struct lm3533_led *led = to_lm3533_led(led_cdev);
 510         u8 reg;
 511         u8 val;
 512         int linear;
 513         int ret;
 514
 515         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 516         ret = lm3533_read(led->lm3533, reg, &val);
 517         if (ret)
 518                 return ret;
 519
 520         if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
 521                 linear = 1;
 522         else
 523                 linear = 0;
 524
 525         return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
 526 }
 527
 528 static ssize_t store_linear(struct device *dev,
 529                                         struct device_attribute *attr,
 530                                         const char *buf, size_t len)
 531 {
 532         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 533         struct lm3533_led *led = to_lm3533_led(led_cdev);
 534         unsigned long linear;
 535         u8 reg;
 536         u8 mask;
 537         u8 val;
 538         int ret;
 539
 540         if (kstrtoul(buf, 0, &linear))
 541                 return -EINVAL;
 542
 543         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 544         mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
 545
 546         if (linear)
 547                 val = mask;
 548         else
 549                 val = 0;
 550
 551         ret = lm3533_update(led->lm3533, reg, val, mask);
 552         if (ret)
 553                 return ret;
 554
 555         return len;
 556 }
 557
 558 static ssize_t show_pwm(struct device *dev,
 559                                         struct device_attribute *attr,
 560                                         char *buf)
 561 {
 562         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 563         struct lm3533_led *led = to_lm3533_led(led_cdev);
 564         u8 val;
 565         int ret;
 566
 567         ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
 568         if (ret)
 569                 return ret;
 570
 571         return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 572 }
 573
 574 static ssize_t store_pwm(struct device *dev,
 575                                         struct device_attribute *attr,
 576                                         const char *buf, size_t len)
 577 {
 578         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 579         struct lm3533_led *led = to_lm3533_led(led_cdev);
 580         u8 val;
 581         int ret;
 582
 583         if (kstrtou8(buf, 0, &val))
 584                 return -EINVAL;
 585
 586         ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
 587         if (ret)
 588                 return ret;
 589
 590         return len;
 591 }
 592
 593 static LM3533_ATTR_RW(als_channel);
 594 static LM3533_ATTR_RW(als_en);
 595 static LM3533_ATTR_RW(falltime);
 596 static LM3533_ATTR_RO(id);
 597 static LM3533_ATTR_RW(linear);
 598 static LM3533_ATTR_RW(pwm);
 599 static LM3533_ATTR_RW(risetime);
 600
 601 static struct attribute *lm3533_led_attributes[] = {
 602         &dev_attr_als_channel.attr,
 603         &dev_attr_als_en.attr,
 604         &dev_attr_falltime.attr,
 605         &dev_attr_id.attr,
 606         &dev_attr_linear.attr,
 607         &dev_attr_pwm.attr,
 608         &dev_attr_risetime.attr,
 609         NULL,
 610 };
 611
 612 static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
 613                                              struct attribute *attr, int n)
 614 {
 615         struct device *dev = container_of(kobj, struct device, kobj);
 616         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 617         struct lm3533_led *led = to_lm3533_led(led_cdev);
 618         umode_t mode = attr->mode;
 619
 620         if (attr == &dev_attr_als_channel.attr ||
 621                                         attr == &dev_attr_als_en.attr) {
 622                 if (!led->lm3533->have_als)
 623                         mode = 0;
 624         }
 625
 626         return mode;
 627 };
 628
 629 static struct attribute_group lm3533_led_attribute_group = {
 630         .is_visible     = lm3533_led_attr_is_visible,
 631         .attrs          = lm3533_led_attributes
 632 };
 633
 634 static const struct attribute_group *lm3533_led_attribute_groups[] = {
 635         &lm3533_led_attribute_group,
 636         NULL
 637 };
 638
 639 static int lm3533_led_setup(struct lm3533_led *led,
 640                                         struct lm3533_led_platform_data *pdata)
 641 {
 642         int ret;
 643
 644         ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
 645         if (ret)
 646                 return ret;
 647
 648         return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
 649 }
 650
 651 static int lm3533_led_probe(struct platform_device *pdev)
 652 {
 653         struct lm3533 *lm3533;
 654         struct lm3533_led_platform_data *pdata;
 655         struct lm3533_led *led;
 656         int ret;
 657
 658         dev_dbg(&pdev->dev, "%s\n", __func__);
 659
 660         lm3533 = dev_get_drvdata(pdev->dev.parent);
 661         if (!lm3533)
 662                 return -EINVAL;
 663
 664         pdata = dev_get_platdata(&pdev->dev);
 665         if (!pdata) {
 666                 dev_err(&pdev->dev, "no platform data\n");
 667                 return -EINVAL;
 668         }
 669
 670         if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
 671                 dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
 672                 return -EINVAL;
 673         }
 674
 675         led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
 676         if (!led)
 677                 return -ENOMEM;
 678
 679         led->lm3533 = lm3533;
 680         led->cdev.name = pdata->name;
 681         led->cdev.default_trigger = pdata->default_trigger;
 682         led->cdev.brightness_set_blocking = lm3533_led_set;
 683         led->cdev.brightness_get = lm3533_led_get;
 684         led->cdev.blink_set = lm3533_led_blink_set;
 685         led->cdev.brightness = LED_OFF;
 686         led->cdev.groups = lm3533_led_attribute_groups,
 687         led->id = pdev->id;
 688
 689         mutex_init(&led->mutex);
 690
 691         /* The class framework makes a callback to get brightness during
 692          * registration so use parent device (for error reporting) until
 693          * registered.
 694          */
 695         led->cb.lm3533 = lm3533;
 696         led->cb.id = lm3533_led_get_ctrlbank_id(led);
 697         led->cb.dev = lm3533->dev;
 698
 699         platform_set_drvdata(pdev, led);
 700
 701         ret = devm_led_classdev_register(pdev->dev.parent, &led->cdev);
 702         if (ret) {
 703                 dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
 704                 return ret;
 705         }
 706
 707         led->cb.dev = led->cdev.dev;
 708
 709         ret = lm3533_led_setup(led, pdata);
 710         if (ret)
 711                 return ret;
 712
 713         ret = lm3533_ctrlbank_enable(&led->cb);
 714         if (ret)
 715                 return ret;
 716
 717         return 0;
 718 }
 719
 720 static int lm3533_led_remove(struct platform_device *pdev)
 721 {
 722         struct lm3533_led *led = platform_get_drvdata(pdev);
 723
 724         dev_dbg(&pdev->dev, "%s\n", __func__);
 725
 726         lm3533_ctrlbank_disable(&led->cb);
 727
 728         return 0;
 729 }
 730
 731 static void lm3533_led_shutdown(struct platform_device *pdev)
 732 {
 733
 734         struct lm3533_led *led = platform_get_drvdata(pdev);
 735
 736         dev_dbg(&pdev->dev, "%s\n", __func__);
 737
 738         lm3533_ctrlbank_disable(&led->cb);
 739         lm3533_led_set(&led->cdev, LED_OFF);            /* disable blink */
 740 }
 741
 742 static struct platform_driver lm3533_led_driver = {
 743         .driver = {
 744                 .name = "lm3533-leds",
 745         },
 746         .probe          = lm3533_led_probe,
 747         .remove         = lm3533_led_remove,
 748         .shutdown       = lm3533_led_shutdown,
 749 };
 750 module_platform_driver(lm3533_led_driver);
 751
 752 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 753 MODULE_DESCRIPTION("LM3533 LED driver");
 754 MODULE_LICENSE("GPL");
 755 MODULE_ALIAS("platform:lm3533-leds");