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 #include <linux/workqueue.h>
  21
  22 #include <linux/mfd/lm3533.h>
  23
  24
  25 #define LM3533_LVCTRLBANK_MIN           2
  26 #define LM3533_LVCTRLBANK_MAX           5
  27 #define LM3533_LVCTRLBANK_COUNT         4
  28 #define LM3533_RISEFALLTIME_MAX         7
  29 #define LM3533_ALS_CHANNEL_LV_MIN       1
  30 #define LM3533_ALS_CHANNEL_LV_MAX       2
  31
  32 #define LM3533_REG_CTRLBANK_BCONF_BASE          0x1b
  33 #define LM3533_REG_PATTERN_ENABLE               0x28
  34 #define LM3533_REG_PATTERN_LOW_TIME_BASE        0x71
  35 #define LM3533_REG_PATTERN_HIGH_TIME_BASE       0x72
  36 #define LM3533_REG_PATTERN_RISETIME_BASE        0x74
  37 #define LM3533_REG_PATTERN_FALLTIME_BASE        0x75
  38
  39 #define LM3533_REG_PATTERN_STEP                 0x10
  40
  41 #define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK          0x04
  42 #define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK           0x02
  43 #define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK      0x01
  44
  45 #define LM3533_LED_FLAG_PATTERN_ENABLE          1
  46
  47
  48 struct lm3533_led {
  49         struct lm3533 *lm3533;
  50         struct lm3533_ctrlbank cb;
  51         struct led_classdev cdev;
  52         int id;
  53
  54         struct mutex mutex;
  55         unsigned long flags;
  56
  57         struct work_struct work;
  58         u8 new_brightness;
  59 };
  60
  61
  62 static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
  63 {
  64         return container_of(cdev, struct lm3533_led, cdev);
  65 }
  66
  67 static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
  68 {
  69         return led->id + 2;
  70 }
  71
  72 static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
  73 {
  74         return base + led->id;
  75 }
  76
  77 static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
  78 {
  79         return led->id;
  80 }
  81
  82 static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
  83                                                                 u8 base)
  84 {
  85         return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
  86 }
  87
  88 static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
  89 {
  90         u8 mask;
  91         u8 val;
  92         int pattern;
  93         int state;
  94         int ret = 0;
  95
  96         dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
  97
  98         mutex_lock(&led->mutex);
  99
 100         state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
 101         if ((enable && state) || (!enable && !state))
 102                 goto out;
 103
 104         pattern = lm3533_led_get_pattern(led);
 105         mask = 1 << (2 * pattern);
 106
 107         if (enable)
 108                 val = mask;
 109         else
 110                 val = 0;
 111
 112         ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
 113         if (ret) {
 114                 dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
 115                                                         pattern, enable);
 116                 goto out;
 117         }
 118
 119         __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
 120 out:
 121         mutex_unlock(&led->mutex);
 122
 123         return ret;
 124 }
 125
 126 static void lm3533_led_work(struct work_struct *work)
 127 {
 128         struct lm3533_led *led = container_of(work, struct lm3533_led, work);
 129
 130         dev_dbg(led->cdev.dev, "%s - %u\n", __func__, led->new_brightness);
 131
 132         if (led->new_brightness == 0)
 133                 lm3533_led_pattern_enable(led, 0);      /* disable blink */
 134
 135         lm3533_ctrlbank_set_brightness(&led->cb, led->new_brightness);
 136 }
 137
 138 static void lm3533_led_set(struct led_classdev *cdev,
 139                                                 enum led_brightness value)
 140 {
 141         struct lm3533_led *led = to_lm3533_led(cdev);
 142
 143         dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
 144
 145         led->new_brightness = value;
 146         schedule_work(&led->work);
 147 }
 148
 149 static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
 150 {
 151         struct lm3533_led *led = to_lm3533_led(cdev);
 152         u8 val;
 153         int ret;
 154
 155         ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
 156         if (ret)
 157                 return ret;
 158
 159         dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
 160
 161         return val;
 162 }
 163
 164 /* Pattern generator defines (delays in us). */
 165 #define LM3533_LED_DELAY1_VMIN  0x00
 166 #define LM3533_LED_DELAY2_VMIN  0x3d
 167 #define LM3533_LED_DELAY3_VMIN  0x80
 168
 169 #define LM3533_LED_DELAY1_VMAX  (LM3533_LED_DELAY2_VMIN - 1)
 170 #define LM3533_LED_DELAY2_VMAX  (LM3533_LED_DELAY3_VMIN - 1)
 171 #define LM3533_LED_DELAY3_VMAX  0xff
 172
 173 #define LM3533_LED_DELAY1_TMIN  16384U
 174 #define LM3533_LED_DELAY2_TMIN  1130496U
 175 #define LM3533_LED_DELAY3_TMIN  10305536U
 176
 177 #define LM3533_LED_DELAY1_TMAX  999424U
 178 #define LM3533_LED_DELAY2_TMAX  9781248U
 179 #define LM3533_LED_DELAY3_TMAX  76890112U
 180
 181 /* t_step = (t_max - t_min) / (v_max - v_min) */
 182 #define LM3533_LED_DELAY1_TSTEP 16384
 183 #define LM3533_LED_DELAY2_TSTEP 131072
 184 #define LM3533_LED_DELAY3_TSTEP 524288
 185
 186 /* Delay limits for hardware accelerated blinking (in ms). */
 187 #define LM3533_LED_DELAY_ON_MAX \
 188         ((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
 189 #define LM3533_LED_DELAY_OFF_MAX \
 190         ((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
 191
 192 /*
 193  * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
 194  * size of t_step, where
 195  *
 196  *      t_step = (t_max - t_min) / (v_max - v_min)
 197  *
 198  * and updates *t to reflect the mapped value.
 199  */
 200 static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
 201                                                         u8 v_min, u8 v_max)
 202 {
 203         unsigned val;
 204
 205         val = (*t + t_step / 2 - t_min) / t_step + v_min;
 206
 207         *t = t_step * (val - v_min) + t_min;
 208
 209         return (u8)val;
 210 }
 211
 212 /*
 213  * Returns time code corresponding to *delay (in ms) and updates *delay to
 214  * reflect actual hardware delay.
 215  *
 216  * Hardware supports 256 discrete delay times, divided into three groups with
 217  * the following ranges and step-sizes:
 218  *
 219  *      [   16,   999]  [0x00, 0x3e]    step  16 ms
 220  *      [ 1130,  9781]  [0x3d, 0x7f]    step 131 ms
 221  *      [10306, 76890]  [0x80, 0xff]    step 524 ms
 222  *
 223  * Note that delay group 3 is only available for delay_off.
 224  */
 225 static u8 lm3533_led_get_hw_delay(unsigned *delay)
 226 {
 227         unsigned t;
 228         u8 val;
 229
 230         t = *delay * 1000;
 231
 232         if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
 233                 t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
 234                 val = time_to_val(&t,   LM3533_LED_DELAY3_TMIN,
 235                                         LM3533_LED_DELAY3_TSTEP,
 236                                         LM3533_LED_DELAY3_VMIN,
 237                                         LM3533_LED_DELAY3_VMAX);
 238         } else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
 239                 t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
 240                 val = time_to_val(&t,   LM3533_LED_DELAY2_TMIN,
 241                                         LM3533_LED_DELAY2_TSTEP,
 242                                         LM3533_LED_DELAY2_VMIN,
 243                                         LM3533_LED_DELAY2_VMAX);
 244         } else {
 245                 t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
 246                 val = time_to_val(&t,   LM3533_LED_DELAY1_TMIN,
 247                                         LM3533_LED_DELAY1_TSTEP,
 248                                         LM3533_LED_DELAY1_VMIN,
 249                                         LM3533_LED_DELAY1_VMAX);
 250         }
 251
 252         *delay = (t + 500) / 1000;
 253
 254         return val;
 255 }
 256
 257 /*
 258  * Set delay register base to *delay (in ms) and update *delay to reflect
 259  * actual hardware delay used.
 260  */
 261 static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
 262                                                         unsigned long *delay)
 263 {
 264         unsigned t;
 265         u8 val;
 266         u8 reg;
 267         int ret;
 268
 269         t = (unsigned)*delay;
 270
 271         /* Delay group 3 is only available for low time (delay off). */
 272         if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
 273                 t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
 274
 275         val = lm3533_led_get_hw_delay(&t);
 276
 277         dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
 278                                                         *delay, t, val);
 279         reg = lm3533_led_get_pattern_reg(led, base);
 280         ret = lm3533_write(led->lm3533, reg, val);
 281         if (ret)
 282                 dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
 283
 284         *delay = t;
 285
 286         return ret;
 287 }
 288
 289 static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
 290 {
 291         return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
 292 }
 293
 294 static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
 295 {
 296         return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
 297 }
 298
 299 static int lm3533_led_blink_set(struct led_classdev *cdev,
 300                                 unsigned long *delay_on,
 301                                 unsigned long *delay_off)
 302 {
 303         struct lm3533_led *led = to_lm3533_led(cdev);
 304         int ret;
 305
 306         dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
 307                                                         *delay_on, *delay_off);
 308
 309         if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
 310                                         *delay_off > LM3533_LED_DELAY_OFF_MAX)
 311                 return -EINVAL;
 312
 313         if (*delay_on == 0 && *delay_off == 0) {
 314                 *delay_on = 500;
 315                 *delay_off = 500;
 316         }
 317
 318         ret = lm3533_led_delay_on_set(led, delay_on);
 319         if (ret)
 320                 return ret;
 321
 322         ret = lm3533_led_delay_off_set(led, delay_off);
 323         if (ret)
 324                 return ret;
 325
 326         return lm3533_led_pattern_enable(led, 1);
 327 }
 328
 329 static ssize_t show_id(struct device *dev,
 330                                 struct device_attribute *attr, char *buf)
 331 {
 332         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 333         struct lm3533_led *led = to_lm3533_led(led_cdev);
 334
 335         return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
 336 }
 337
 338 /*
 339  * Pattern generator rise/fall times:
 340  *
 341  *   0 - 2048 us (default)
 342  *   1 - 262 ms
 343  *   2 - 524 ms
 344  *   3 - 1.049 s
 345  *   4 - 2.097 s
 346  *   5 - 4.194 s
 347  *   6 - 8.389 s
 348  *   7 - 16.78 s
 349  */
 350 static ssize_t show_risefalltime(struct device *dev,
 351                                         struct device_attribute *attr,
 352                                         char *buf, u8 base)
 353 {
 354         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 355         struct lm3533_led *led = to_lm3533_led(led_cdev);
 356         ssize_t ret;
 357         u8 reg;
 358         u8 val;
 359
 360         reg = lm3533_led_get_pattern_reg(led, base);
 361         ret = lm3533_read(led->lm3533, reg, &val);
 362         if (ret)
 363                 return ret;
 364
 365         return scnprintf(buf, PAGE_SIZE, "%x\n", val);
 366 }
 367
 368 static ssize_t show_risetime(struct device *dev,
 369                                 struct device_attribute *attr, char *buf)
 370 {
 371         return show_risefalltime(dev, attr, buf,
 372                                         LM3533_REG_PATTERN_RISETIME_BASE);
 373 }
 374
 375 static ssize_t show_falltime(struct device *dev,
 376                                 struct device_attribute *attr, char *buf)
 377 {
 378         return show_risefalltime(dev, attr, buf,
 379                                         LM3533_REG_PATTERN_FALLTIME_BASE);
 380 }
 381
 382 static ssize_t store_risefalltime(struct device *dev,
 383                                         struct device_attribute *attr,
 384                                         const char *buf, size_t len, u8 base)
 385 {
 386         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 387         struct lm3533_led *led = to_lm3533_led(led_cdev);
 388         u8 val;
 389         u8 reg;
 390         int ret;
 391
 392         if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
 393                 return -EINVAL;
 394
 395         reg = lm3533_led_get_pattern_reg(led, base);
 396         ret = lm3533_write(led->lm3533, reg, val);
 397         if (ret)
 398                 return ret;
 399
 400         return len;
 401 }
 402
 403 static ssize_t store_risetime(struct device *dev,
 404                                         struct device_attribute *attr,
 405                                         const char *buf, size_t len)
 406 {
 407         return store_risefalltime(dev, attr, buf, len,
 408                                         LM3533_REG_PATTERN_RISETIME_BASE);
 409 }
 410
 411 static ssize_t store_falltime(struct device *dev,
 412                                         struct device_attribute *attr,
 413                                         const char *buf, size_t len)
 414 {
 415         return store_risefalltime(dev, attr, buf, len,
 416                                         LM3533_REG_PATTERN_FALLTIME_BASE);
 417 }
 418
 419 static ssize_t show_als_channel(struct device *dev,
 420                                 struct device_attribute *attr, char *buf)
 421 {
 422         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 423         struct lm3533_led *led = to_lm3533_led(led_cdev);
 424         unsigned channel;
 425         u8 reg;
 426         u8 val;
 427         int ret;
 428
 429         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 430         ret = lm3533_read(led->lm3533, reg, &val);
 431         if (ret)
 432                 return ret;
 433
 434         channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
 435
 436         return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
 437 }
 438
 439 static ssize_t store_als_channel(struct device *dev,
 440                                         struct device_attribute *attr,
 441                                         const char *buf, size_t len)
 442 {
 443         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 444         struct lm3533_led *led = to_lm3533_led(led_cdev);
 445         unsigned channel;
 446         u8 reg;
 447         u8 val;
 448         u8 mask;
 449         int ret;
 450
 451         if (kstrtouint(buf, 0, &channel))
 452                 return -EINVAL;
 453
 454         if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
 455                                         channel > LM3533_ALS_CHANNEL_LV_MAX)
 456                 return -EINVAL;
 457
 458         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 459         mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
 460         val = channel - 1;
 461
 462         ret = lm3533_update(led->lm3533, reg, val, mask);
 463         if (ret)
 464                 return ret;
 465
 466         return len;
 467 }
 468
 469 static ssize_t show_als_en(struct device *dev,
 470                                 struct device_attribute *attr, char *buf)
 471 {
 472         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 473         struct lm3533_led *led = to_lm3533_led(led_cdev);
 474         bool enable;
 475         u8 reg;
 476         u8 val;
 477         int ret;
 478
 479         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 480         ret = lm3533_read(led->lm3533, reg, &val);
 481         if (ret)
 482                 return ret;
 483
 484         enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
 485
 486         return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
 487 }
 488
 489 static ssize_t store_als_en(struct device *dev,
 490                                         struct device_attribute *attr,
 491                                         const char *buf, size_t len)
 492 {
 493         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 494         struct lm3533_led *led = to_lm3533_led(led_cdev);
 495         unsigned enable;
 496         u8 reg;
 497         u8 mask;
 498         u8 val;
 499         int ret;
 500
 501         if (kstrtouint(buf, 0, &enable))
 502                 return -EINVAL;
 503
 504         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 505         mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
 506
 507         if (enable)
 508                 val = mask;
 509         else
 510                 val = 0;
 511
 512         ret = lm3533_update(led->lm3533, reg, val, mask);
 513         if (ret)
 514                 return ret;
 515
 516         return len;
 517 }
 518
 519 static ssize_t show_linear(struct device *dev,
 520                                 struct device_attribute *attr, char *buf)
 521 {
 522         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 523         struct lm3533_led *led = to_lm3533_led(led_cdev);
 524         u8 reg;
 525         u8 val;
 526         int linear;
 527         int ret;
 528
 529         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 530         ret = lm3533_read(led->lm3533, reg, &val);
 531         if (ret)
 532                 return ret;
 533
 534         if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
 535                 linear = 1;
 536         else
 537                 linear = 0;
 538
 539         return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
 540 }
 541
 542 static ssize_t store_linear(struct device *dev,
 543                                         struct device_attribute *attr,
 544                                         const char *buf, size_t len)
 545 {
 546         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 547         struct lm3533_led *led = to_lm3533_led(led_cdev);
 548         unsigned long linear;
 549         u8 reg;
 550         u8 mask;
 551         u8 val;
 552         int ret;
 553
 554         if (kstrtoul(buf, 0, &linear))
 555                 return -EINVAL;
 556
 557         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 558         mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
 559
 560         if (linear)
 561                 val = mask;
 562         else
 563                 val = 0;
 564
 565         ret = lm3533_update(led->lm3533, reg, val, mask);
 566         if (ret)
 567                 return ret;
 568
 569         return len;
 570 }
 571
 572 static ssize_t show_pwm(struct device *dev,
 573                                         struct device_attribute *attr,
 574                                         char *buf)
 575 {
 576         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 577         struct lm3533_led *led = to_lm3533_led(led_cdev);
 578         u8 val;
 579         int ret;
 580
 581         ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
 582         if (ret)
 583                 return ret;
 584
 585         return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 586 }
 587
 588 static ssize_t store_pwm(struct device *dev,
 589                                         struct device_attribute *attr,
 590                                         const char *buf, size_t len)
 591 {
 592         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 593         struct lm3533_led *led = to_lm3533_led(led_cdev);
 594         u8 val;
 595         int ret;
 596
 597         if (kstrtou8(buf, 0, &val))
 598                 return -EINVAL;
 599
 600         ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
 601         if (ret)
 602                 return ret;
 603
 604         return len;
 605 }
 606
 607 static LM3533_ATTR_RW(als_channel);
 608 static LM3533_ATTR_RW(als_en);
 609 static LM3533_ATTR_RW(falltime);
 610 static LM3533_ATTR_RO(id);
 611 static LM3533_ATTR_RW(linear);
 612 static LM3533_ATTR_RW(pwm);
 613 static LM3533_ATTR_RW(risetime);
 614
 615 static struct attribute *lm3533_led_attributes[] = {
 616         &dev_attr_als_channel.attr,
 617         &dev_attr_als_en.attr,
 618         &dev_attr_falltime.attr,
 619         &dev_attr_id.attr,
 620         &dev_attr_linear.attr,
 621         &dev_attr_pwm.attr,
 622         &dev_attr_risetime.attr,
 623         NULL,
 624 };
 625
 626 static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
 627                                              struct attribute *attr, int n)
 628 {
 629         struct device *dev = container_of(kobj, struct device, kobj);
 630         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 631         struct lm3533_led *led = to_lm3533_led(led_cdev);
 632         umode_t mode = attr->mode;
 633
 634         if (attr == &dev_attr_als_channel.attr ||
 635                                         attr == &dev_attr_als_en.attr) {
 636                 if (!led->lm3533->have_als)
 637                         mode = 0;
 638         }
 639
 640         return mode;
 641 };
 642
 643 static struct attribute_group lm3533_led_attribute_group = {
 644         .is_visible     = lm3533_led_attr_is_visible,
 645         .attrs          = lm3533_led_attributes
 646 };
 647
 648 static const struct attribute_group *lm3533_led_attribute_groups[] = {
 649         &lm3533_led_attribute_group,
 650         NULL
 651 };
 652
 653 static int lm3533_led_setup(struct lm3533_led *led,
 654                                         struct lm3533_led_platform_data *pdata)
 655 {
 656         int ret;
 657
 658         ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
 659         if (ret)
 660                 return ret;
 661
 662         return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
 663 }
 664
 665 static int lm3533_led_probe(struct platform_device *pdev)
 666 {
 667         struct lm3533 *lm3533;
 668         struct lm3533_led_platform_data *pdata;
 669         struct lm3533_led *led;
 670         int ret;
 671
 672         dev_dbg(&pdev->dev, "%s\n", __func__);
 673
 674         lm3533 = dev_get_drvdata(pdev->dev.parent);
 675         if (!lm3533)
 676                 return -EINVAL;
 677
 678         pdata = dev_get_platdata(&pdev->dev);
 679         if (!pdata) {
 680                 dev_err(&pdev->dev, "no platform data\n");
 681                 return -EINVAL;
 682         }
 683
 684         if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
 685                 dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
 686                 return -EINVAL;
 687         }
 688
 689         led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
 690         if (!led)
 691                 return -ENOMEM;
 692
 693         led->lm3533 = lm3533;
 694         led->cdev.name = pdata->name;
 695         led->cdev.default_trigger = pdata->default_trigger;
 696         led->cdev.brightness_set = lm3533_led_set;
 697         led->cdev.brightness_get = lm3533_led_get;
 698         led->cdev.blink_set = lm3533_led_blink_set;
 699         led->cdev.brightness = LED_OFF;
 700         led->cdev.groups = lm3533_led_attribute_groups,
 701         led->id = pdev->id;
 702
 703         mutex_init(&led->mutex);
 704         INIT_WORK(&led->work, lm3533_led_work);
 705
 706         /* The class framework makes a callback to get brightness during
 707          * registration so use parent device (for error reporting) until
 708          * registered.
 709          */
 710         led->cb.lm3533 = lm3533;
 711         led->cb.id = lm3533_led_get_ctrlbank_id(led);
 712         led->cb.dev = lm3533->dev;
 713
 714         platform_set_drvdata(pdev, led);
 715
 716         ret = led_classdev_register(pdev->dev.parent, &led->cdev);
 717         if (ret) {
 718                 dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
 719                 return ret;
 720         }
 721
 722         led->cb.dev = led->cdev.dev;
 723
 724         ret = lm3533_led_setup(led, pdata);
 725         if (ret)
 726                 goto err_unregister;
 727
 728         ret = lm3533_ctrlbank_enable(&led->cb);
 729         if (ret)
 730                 goto err_unregister;
 731
 732         return 0;
 733
 734 err_unregister:
 735         led_classdev_unregister(&led->cdev);
 736         flush_work(&led->work);
 737
 738         return ret;
 739 }
 740
 741 static int lm3533_led_remove(struct platform_device *pdev)
 742 {
 743         struct lm3533_led *led = platform_get_drvdata(pdev);
 744
 745         dev_dbg(&pdev->dev, "%s\n", __func__);
 746
 747         lm3533_ctrlbank_disable(&led->cb);
 748         led_classdev_unregister(&led->cdev);
 749         flush_work(&led->work);
 750
 751         return 0;
 752 }
 753
 754 static void lm3533_led_shutdown(struct platform_device *pdev)
 755 {
 756
 757         struct lm3533_led *led = platform_get_drvdata(pdev);
 758
 759         dev_dbg(&pdev->dev, "%s\n", __func__);
 760
 761         lm3533_ctrlbank_disable(&led->cb);
 762         lm3533_led_set(&led->cdev, LED_OFF);            /* disable blink */
 763         flush_work(&led->work);
 764 }
 765
 766 static struct platform_driver lm3533_led_driver = {
 767         .driver = {
 768                 .name = "lm3533-leds",
 769         },
 770         .probe          = lm3533_led_probe,
 771         .remove         = lm3533_led_remove,
 772         .shutdown       = lm3533_led_shutdown,
 773 };
 774 module_platform_driver(lm3533_led_driver);
 775
 776 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 777 MODULE_DESCRIPTION("LM3533 LED driver");
 778 MODULE_LICENSE("GPL");
 779 MODULE_ALIAS("platform:lm3533-leds");