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/init.h>
  16 #include <linux/leds.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/mutex.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/slab.h>
  21 #include <linux/workqueue.h>
  22
  23 #include <linux/mfd/lm3533.h>
  24
  25
  26 #define LM3533_LVCTRLBANK_MIN           2
  27 #define LM3533_LVCTRLBANK_MAX           5
  28 #define LM3533_LVCTRLBANK_COUNT         4
  29 #define LM3533_RISEFALLTIME_MAX         7
  30 #define LM3533_ALS_CHANNEL_LV_MIN       1
  31 #define LM3533_ALS_CHANNEL_LV_MAX       2
  32
  33 #define LM3533_REG_CTRLBANK_BCONF_BASE          0x1b
  34 #define LM3533_REG_PATTERN_ENABLE               0x28
  35 #define LM3533_REG_PATTERN_LOW_TIME_BASE        0x71
  36 #define LM3533_REG_PATTERN_HIGH_TIME_BASE       0x72
  37 #define LM3533_REG_PATTERN_RISETIME_BASE        0x74
  38 #define LM3533_REG_PATTERN_FALLTIME_BASE        0x75
  39
  40 #define LM3533_REG_PATTERN_STEP                 0x10
  41
  42 #define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK          0x04
  43 #define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK           0x02
  44 #define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK      0x01
  45
  46 #define LM3533_LED_FLAG_PATTERN_ENABLE          1
  47
  48
  49 struct lm3533_led {
  50         struct lm3533 *lm3533;
  51         struct lm3533_ctrlbank cb;
  52         struct led_classdev cdev;
  53         int id;
  54
  55         struct mutex mutex;
  56         unsigned long flags;
  57
  58         struct work_struct work;
  59         u8 new_brightness;
  60 };
  61
  62
  63 static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
  64 {
  65         return container_of(cdev, struct lm3533_led, cdev);
  66 }
  67
  68 static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
  69 {
  70         return led->id + 2;
  71 }
  72
  73 static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
  74 {
  75         return base + led->id;
  76 }
  77
  78 static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
  79 {
  80         return led->id;
  81 }
  82
  83 static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
  84                                                                 u8 base)
  85 {
  86         return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
  87 }
  88
  89 static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
  90 {
  91         u8 mask;
  92         u8 val;
  93         int pattern;
  94         int state;
  95         int ret = 0;
  96
  97         dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
  98
  99         mutex_lock(&led->mutex);
 100
 101         state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
 102         if ((enable && state) || (!enable && !state))
 103                 goto out;
 104
 105         pattern = lm3533_led_get_pattern(led);
 106         mask = 1 << (2 * pattern);
 107
 108         if (enable)
 109                 val = mask;
 110         else
 111                 val = 0;
 112
 113         ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
 114         if (ret) {
 115                 dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
 116                                                         pattern, enable);
 117                 goto out;
 118         }
 119
 120         __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
 121 out:
 122         mutex_unlock(&led->mutex);
 123
 124         return ret;
 125 }
 126
 127 static void lm3533_led_work(struct work_struct *work)
 128 {
 129         struct lm3533_led *led = container_of(work, struct lm3533_led, work);
 130
 131         dev_dbg(led->cdev.dev, "%s - %u\n", __func__, led->new_brightness);
 132
 133         if (led->new_brightness == 0)
 134                 lm3533_led_pattern_enable(led, 0);      /* disable blink */
 135
 136         lm3533_ctrlbank_set_brightness(&led->cb, led->new_brightness);
 137 }
 138
 139 static void lm3533_led_set(struct led_classdev *cdev,
 140                                                 enum led_brightness value)
 141 {
 142         struct lm3533_led *led = to_lm3533_led(cdev);
 143
 144         dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
 145
 146         led->new_brightness = value;
 147         schedule_work(&led->work);
 148 }
 149
 150 static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
 151 {
 152         struct lm3533_led *led = to_lm3533_led(cdev);
 153         u8 val;
 154         int ret;
 155
 156         ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
 157         if (ret)
 158                 return ret;
 159
 160         dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
 161
 162         return val;
 163 }
 164
 165 /* Pattern generator defines (delays in us). */
 166 #define LM3533_LED_DELAY1_VMIN  0x00
 167 #define LM3533_LED_DELAY2_VMIN  0x3d
 168 #define LM3533_LED_DELAY3_VMIN  0x80
 169
 170 #define LM3533_LED_DELAY1_VMAX  (LM3533_LED_DELAY2_VMIN - 1)
 171 #define LM3533_LED_DELAY2_VMAX  (LM3533_LED_DELAY3_VMIN - 1)
 172 #define LM3533_LED_DELAY3_VMAX  0xff
 173
 174 #define LM3533_LED_DELAY1_TMIN  16384U
 175 #define LM3533_LED_DELAY2_TMIN  1130496U
 176 #define LM3533_LED_DELAY3_TMIN  10305536U
 177
 178 #define LM3533_LED_DELAY1_TMAX  999424U
 179 #define LM3533_LED_DELAY2_TMAX  9781248U
 180 #define LM3533_LED_DELAY3_TMAX  76890112U
 181
 182 /* t_step = (t_max - t_min) / (v_max - v_min) */
 183 #define LM3533_LED_DELAY1_TSTEP 16384
 184 #define LM3533_LED_DELAY2_TSTEP 131072
 185 #define LM3533_LED_DELAY3_TSTEP 524288
 186
 187 /* Delay limits for hardware accelerated blinking (in ms). */
 188 #define LM3533_LED_DELAY_ON_MAX \
 189         ((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
 190 #define LM3533_LED_DELAY_OFF_MAX \
 191         ((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
 192
 193 /*
 194  * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
 195  * size of t_step, where
 196  *
 197  *      t_step = (t_max - t_min) / (v_max - v_min)
 198  *
 199  * and updates *t to reflect the mapped value.
 200  */
 201 static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
 202                                                         u8 v_min, u8 v_max)
 203 {
 204         unsigned val;
 205
 206         val = (*t + t_step / 2 - t_min) / t_step + v_min;
 207
 208         *t = t_step * (val - v_min) + t_min;
 209
 210         return (u8)val;
 211 }
 212
 213 /*
 214  * Returns time code corresponding to *delay (in ms) and updates *delay to
 215  * reflect actual hardware delay.
 216  *
 217  * Hardware supports 256 discrete delay times, divided into three groups with
 218  * the following ranges and step-sizes:
 219  *
 220  *      [   16,   999]  [0x00, 0x3e]    step  16 ms
 221  *      [ 1130,  9781]  [0x3d, 0x7f]    step 131 ms
 222  *      [10306, 76890]  [0x80, 0xff]    step 524 ms
 223  *
 224  * Note that delay group 3 is only available for delay_off.
 225  */
 226 static u8 lm3533_led_get_hw_delay(unsigned *delay)
 227 {
 228         unsigned t;
 229         u8 val;
 230
 231         t = *delay * 1000;
 232
 233         if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
 234                 t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
 235                 val = time_to_val(&t,   LM3533_LED_DELAY3_TMIN,
 236                                         LM3533_LED_DELAY3_TSTEP,
 237                                         LM3533_LED_DELAY3_VMIN,
 238                                         LM3533_LED_DELAY3_VMAX);
 239         } else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
 240                 t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
 241                 val = time_to_val(&t,   LM3533_LED_DELAY2_TMIN,
 242                                         LM3533_LED_DELAY2_TSTEP,
 243                                         LM3533_LED_DELAY2_VMIN,
 244                                         LM3533_LED_DELAY2_VMAX);
 245         } else {
 246                 t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
 247                 val = time_to_val(&t,   LM3533_LED_DELAY1_TMIN,
 248                                         LM3533_LED_DELAY1_TSTEP,
 249                                         LM3533_LED_DELAY1_VMIN,
 250                                         LM3533_LED_DELAY1_VMAX);
 251         }
 252
 253         *delay = (t + 500) / 1000;
 254
 255         return val;
 256 }
 257
 258 /*
 259  * Set delay register base to *delay (in ms) and update *delay to reflect
 260  * actual hardware delay used.
 261  */
 262 static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
 263                                                         unsigned long *delay)
 264 {
 265         unsigned t;
 266         u8 val;
 267         u8 reg;
 268         int ret;
 269
 270         t = (unsigned)*delay;
 271
 272         /* Delay group 3 is only available for low time (delay off). */
 273         if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
 274                 t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
 275
 276         val = lm3533_led_get_hw_delay(&t);
 277
 278         dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
 279                                                         *delay, t, val);
 280         reg = lm3533_led_get_pattern_reg(led, base);
 281         ret = lm3533_write(led->lm3533, reg, val);
 282         if (ret)
 283                 dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
 284
 285         *delay = t;
 286
 287         return ret;
 288 }
 289
 290 static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
 291 {
 292         return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
 293 }
 294
 295 static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
 296 {
 297         return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
 298 }
 299
 300 static int lm3533_led_blink_set(struct led_classdev *cdev,
 301                                 unsigned long *delay_on,
 302                                 unsigned long *delay_off)
 303 {
 304         struct lm3533_led *led = to_lm3533_led(cdev);
 305         int ret;
 306
 307         dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
 308                                                         *delay_on, *delay_off);
 309
 310         if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
 311                                         *delay_off > LM3533_LED_DELAY_OFF_MAX)
 312                 return -EINVAL;
 313
 314         if (*delay_on == 0 && *delay_off == 0) {
 315                 *delay_on = 500;
 316                 *delay_off = 500;
 317         }
 318
 319         ret = lm3533_led_delay_on_set(led, delay_on);
 320         if (ret)
 321                 return ret;
 322
 323         ret = lm3533_led_delay_off_set(led, delay_off);
 324         if (ret)
 325                 return ret;
 326
 327         return lm3533_led_pattern_enable(led, 1);
 328 }
 329
 330 static ssize_t show_id(struct device *dev,
 331                                 struct device_attribute *attr, char *buf)
 332 {
 333         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 334         struct lm3533_led *led = to_lm3533_led(led_cdev);
 335
 336         return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
 337 }
 338
 339 /*
 340  * Pattern generator rise/fall times:
 341  *
 342  *   0 - 2048 us (default)
 343  *   1 - 262 ms
 344  *   2 - 524 ms
 345  *   3 - 1.049 s
 346  *   4 - 2.097 s
 347  *   5 - 4.194 s
 348  *   6 - 8.389 s
 349  *   7 - 16.78 s
 350  */
 351 static ssize_t show_risefalltime(struct device *dev,
 352                                         struct device_attribute *attr,
 353                                         char *buf, u8 base)
 354 {
 355         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 356         struct lm3533_led *led = to_lm3533_led(led_cdev);
 357         ssize_t ret;
 358         u8 reg;
 359         u8 val;
 360
 361         reg = lm3533_led_get_pattern_reg(led, base);
 362         ret = lm3533_read(led->lm3533, reg, &val);
 363         if (ret)
 364                 return ret;
 365
 366         return scnprintf(buf, PAGE_SIZE, "%x\n", val);
 367 }
 368
 369 static ssize_t show_risetime(struct device *dev,
 370                                 struct device_attribute *attr, char *buf)
 371 {
 372         return show_risefalltime(dev, attr, buf,
 373                                         LM3533_REG_PATTERN_RISETIME_BASE);
 374 }
 375
 376 static ssize_t show_falltime(struct device *dev,
 377                                 struct device_attribute *attr, char *buf)
 378 {
 379         return show_risefalltime(dev, attr, buf,
 380                                         LM3533_REG_PATTERN_FALLTIME_BASE);
 381 }
 382
 383 static ssize_t store_risefalltime(struct device *dev,
 384                                         struct device_attribute *attr,
 385                                         const char *buf, size_t len, u8 base)
 386 {
 387         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 388         struct lm3533_led *led = to_lm3533_led(led_cdev);
 389         u8 val;
 390         u8 reg;
 391         int ret;
 392
 393         if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
 394                 return -EINVAL;
 395
 396         reg = lm3533_led_get_pattern_reg(led, base);
 397         ret = lm3533_write(led->lm3533, reg, val);
 398         if (ret)
 399                 return ret;
 400
 401         return len;
 402 }
 403
 404 static ssize_t store_risetime(struct device *dev,
 405                                         struct device_attribute *attr,
 406                                         const char *buf, size_t len)
 407 {
 408         return store_risefalltime(dev, attr, buf, len,
 409                                         LM3533_REG_PATTERN_RISETIME_BASE);
 410 }
 411
 412 static ssize_t store_falltime(struct device *dev,
 413                                         struct device_attribute *attr,
 414                                         const char *buf, size_t len)
 415 {
 416         return store_risefalltime(dev, attr, buf, len,
 417                                         LM3533_REG_PATTERN_FALLTIME_BASE);
 418 }
 419
 420 static ssize_t show_als_channel(struct device *dev,
 421                                 struct device_attribute *attr, char *buf)
 422 {
 423         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 424         struct lm3533_led *led = to_lm3533_led(led_cdev);
 425         unsigned channel;
 426         u8 reg;
 427         u8 val;
 428         int ret;
 429
 430         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 431         ret = lm3533_read(led->lm3533, reg, &val);
 432         if (ret)
 433                 return ret;
 434
 435         channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
 436
 437         return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
 438 }
 439
 440 static ssize_t store_als_channel(struct device *dev,
 441                                         struct device_attribute *attr,
 442                                         const char *buf, size_t len)
 443 {
 444         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 445         struct lm3533_led *led = to_lm3533_led(led_cdev);
 446         unsigned channel;
 447         u8 reg;
 448         u8 val;
 449         u8 mask;
 450         int ret;
 451
 452         if (kstrtouint(buf, 0, &channel))
 453                 return -EINVAL;
 454
 455         if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
 456                                         channel > LM3533_ALS_CHANNEL_LV_MAX)
 457                 return -EINVAL;
 458
 459         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 460         mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
 461         val = channel - 1;
 462
 463         ret = lm3533_update(led->lm3533, reg, val, mask);
 464         if (ret)
 465                 return ret;
 466
 467         return len;
 468 }
 469
 470 static ssize_t show_als_en(struct device *dev,
 471                                 struct device_attribute *attr, char *buf)
 472 {
 473         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 474         struct lm3533_led *led = to_lm3533_led(led_cdev);
 475         bool enable;
 476         u8 reg;
 477         u8 val;
 478         int ret;
 479
 480         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 481         ret = lm3533_read(led->lm3533, reg, &val);
 482         if (ret)
 483                 return ret;
 484
 485         enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
 486
 487         return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
 488 }
 489
 490 static ssize_t store_als_en(struct device *dev,
 491                                         struct device_attribute *attr,
 492                                         const char *buf, size_t len)
 493 {
 494         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 495         struct lm3533_led *led = to_lm3533_led(led_cdev);
 496         unsigned enable;
 497         u8 reg;
 498         u8 mask;
 499         u8 val;
 500         int ret;
 501
 502         if (kstrtouint(buf, 0, &enable))
 503                 return -EINVAL;
 504
 505         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 506         mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
 507
 508         if (enable)
 509                 val = mask;
 510         else
 511                 val = 0;
 512
 513         ret = lm3533_update(led->lm3533, reg, val, mask);
 514         if (ret)
 515                 return ret;
 516
 517         return len;
 518 }
 519
 520 static ssize_t show_linear(struct device *dev,
 521                                 struct device_attribute *attr, char *buf)
 522 {
 523         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 524         struct lm3533_led *led = to_lm3533_led(led_cdev);
 525         u8 reg;
 526         u8 val;
 527         int linear;
 528         int ret;
 529
 530         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 531         ret = lm3533_read(led->lm3533, reg, &val);
 532         if (ret)
 533                 return ret;
 534
 535         if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
 536                 linear = 1;
 537         else
 538                 linear = 0;
 539
 540         return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
 541 }
 542
 543 static ssize_t store_linear(struct device *dev,
 544                                         struct device_attribute *attr,
 545                                         const char *buf, size_t len)
 546 {
 547         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 548         struct lm3533_led *led = to_lm3533_led(led_cdev);
 549         unsigned long linear;
 550         u8 reg;
 551         u8 mask;
 552         u8 val;
 553         int ret;
 554
 555         if (kstrtoul(buf, 0, &linear))
 556                 return -EINVAL;
 557
 558         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 559         mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
 560
 561         if (linear)
 562                 val = mask;
 563         else
 564                 val = 0;
 565
 566         ret = lm3533_update(led->lm3533, reg, val, mask);
 567         if (ret)
 568                 return ret;
 569
 570         return len;
 571 }
 572
 573 static ssize_t show_pwm(struct device *dev,
 574                                         struct device_attribute *attr,
 575                                         char *buf)
 576 {
 577         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 578         struct lm3533_led *led = to_lm3533_led(led_cdev);
 579         u8 val;
 580         int ret;
 581
 582         ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
 583         if (ret)
 584                 return ret;
 585
 586         return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 587 }
 588
 589 static ssize_t store_pwm(struct device *dev,
 590                                         struct device_attribute *attr,
 591                                         const char *buf, size_t len)
 592 {
 593         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 594         struct lm3533_led *led = to_lm3533_led(led_cdev);
 595         u8 val;
 596         int ret;
 597
 598         if (kstrtou8(buf, 0, &val))
 599                 return -EINVAL;
 600
 601         ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
 602         if (ret)
 603                 return ret;
 604
 605         return len;
 606 }
 607
 608 static LM3533_ATTR_RW(als_channel);
 609 static LM3533_ATTR_RW(als_en);
 610 static LM3533_ATTR_RW(falltime);
 611 static LM3533_ATTR_RO(id);
 612 static LM3533_ATTR_RW(linear);
 613 static LM3533_ATTR_RW(pwm);
 614 static LM3533_ATTR_RW(risetime);
 615
 616 static struct attribute *lm3533_led_attributes[] = {
 617         &dev_attr_als_channel.attr,
 618         &dev_attr_als_en.attr,
 619         &dev_attr_falltime.attr,
 620         &dev_attr_id.attr,
 621         &dev_attr_linear.attr,
 622         &dev_attr_pwm.attr,
 623         &dev_attr_risetime.attr,
 624         NULL,
 625 };
 626
 627 static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
 628                                              struct attribute *attr, int n)
 629 {
 630         struct device *dev = container_of(kobj, struct device, kobj);
 631         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 632         struct lm3533_led *led = to_lm3533_led(led_cdev);
 633         umode_t mode = attr->mode;
 634
 635         if (attr == &dev_attr_als_channel.attr ||
 636                                         attr == &dev_attr_als_en.attr) {
 637                 if (!led->lm3533->have_als)
 638                         mode = 0;
 639         }
 640
 641         return mode;
 642 };
 643
 644 static struct attribute_group lm3533_led_attribute_group = {
 645         .is_visible     = lm3533_led_attr_is_visible,
 646         .attrs          = lm3533_led_attributes
 647 };
 648
 649 static int lm3533_led_setup(struct lm3533_led *led,
 650                                         struct lm3533_led_platform_data *pdata)
 651 {
 652         int ret;
 653
 654         ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
 655         if (ret)
 656                 return ret;
 657
 658         return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
 659 }
 660
 661 static int lm3533_led_probe(struct platform_device *pdev)
 662 {
 663         struct lm3533 *lm3533;
 664         struct lm3533_led_platform_data *pdata;
 665         struct lm3533_led *led;
 666         int ret;
 667
 668         dev_dbg(&pdev->dev, "%s\n", __func__);
 669
 670         lm3533 = dev_get_drvdata(pdev->dev.parent);
 671         if (!lm3533)
 672                 return -EINVAL;
 673
 674         pdata = pdev->dev.platform_data;
 675         if (!pdata) {
 676                 dev_err(&pdev->dev, "no platform data\n");
 677                 return -EINVAL;
 678         }
 679
 680         if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
 681                 dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
 682                 return -EINVAL;
 683         }
 684
 685         led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
 686         if (!led)
 687                 return -ENOMEM;
 688
 689         led->lm3533 = lm3533;
 690         led->cdev.name = pdata->name;
 691         led->cdev.default_trigger = pdata->default_trigger;
 692         led->cdev.brightness_set = lm3533_led_set;
 693         led->cdev.brightness_get = lm3533_led_get;
 694         led->cdev.blink_set = lm3533_led_blink_set;
 695         led->cdev.brightness = LED_OFF;
 696         led->id = pdev->id;
 697
 698         mutex_init(&led->mutex);
 699         INIT_WORK(&led->work, lm3533_led_work);
 700
 701         /* The class framework makes a callback to get brightness during
 702          * registration so use parent device (for error reporting) until
 703          * registered.
 704          */
 705         led->cb.lm3533 = lm3533;
 706         led->cb.id = lm3533_led_get_ctrlbank_id(led);
 707         led->cb.dev = lm3533->dev;
 708
 709         platform_set_drvdata(pdev, led);
 710
 711         ret = led_classdev_register(pdev->dev.parent, &led->cdev);
 712         if (ret) {
 713                 dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
 714                 return ret;
 715         }
 716
 717         led->cb.dev = led->cdev.dev;
 718
 719         ret = sysfs_create_group(&led->cdev.dev->kobj,
 720                                                 &lm3533_led_attribute_group);
 721         if (ret < 0) {
 722                 dev_err(&pdev->dev, "failed to create sysfs attributes\n");
 723                 goto err_unregister;
 724         }
 725
 726         ret = lm3533_led_setup(led, pdata);
 727         if (ret)
 728                 goto err_sysfs_remove;
 729
 730         ret = lm3533_ctrlbank_enable(&led->cb);
 731         if (ret)
 732                 goto err_sysfs_remove;
 733
 734         return 0;
 735
 736 err_sysfs_remove:
 737         sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
 738 err_unregister:
 739         led_classdev_unregister(&led->cdev);
 740         flush_work(&led->work);
 741
 742         return ret;
 743 }
 744
 745 static int lm3533_led_remove(struct platform_device *pdev)
 746 {
 747         struct lm3533_led *led = platform_get_drvdata(pdev);
 748
 749         dev_dbg(&pdev->dev, "%s\n", __func__);
 750
 751         lm3533_ctrlbank_disable(&led->cb);
 752         sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
 753         led_classdev_unregister(&led->cdev);
 754         flush_work(&led->work);
 755
 756         return 0;
 757 }
 758
 759 static void lm3533_led_shutdown(struct platform_device *pdev)
 760 {
 761
 762         struct lm3533_led *led = platform_get_drvdata(pdev);
 763
 764         dev_dbg(&pdev->dev, "%s\n", __func__);
 765
 766         lm3533_ctrlbank_disable(&led->cb);
 767         lm3533_led_set(&led->cdev, LED_OFF);            /* disable blink */
 768         flush_work(&led->work);
 769 }
 770
 771 static struct platform_driver lm3533_led_driver = {
 772         .driver = {
 773                 .name = "lm3533-leds",
 774                 .owner = THIS_MODULE,
 775         },
 776         .probe          = lm3533_led_probe,
 777         .remove         = lm3533_led_remove,
 778         .shutdown       = lm3533_led_shutdown,
 779 };
 780 module_platform_driver(lm3533_led_driver);
 781
 782 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 783 MODULE_DESCRIPTION("LM3533 LED driver");
 784 MODULE_LICENSE("GPL");
 785 MODULE_ALIAS("platform:lm3533-leds");