linux/drivers/leds/leds-lm3533.c
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   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
  49struct 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
  63static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
  64{
  65        return container_of(cdev, struct lm3533_led, cdev);
  66}
  67
  68static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
  69{
  70        return led->id + 2;
  71}
  72
  73static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
  74{
  75        return base + led->id;
  76}
  77
  78static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
  79{
  80        return led->id;
  81}
  82
  83static 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
  89static 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);
 121out:
 122        mutex_unlock(&led->mutex);
 123
 124        return ret;
 125}
 126
 127static 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
 139static 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
 150static 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 */
 201static 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 */
 226static 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 */
 262static 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
 290static 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
 295static 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
 300static 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
 330static 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 */
 351static 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
 369static 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
 376static 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
 383static 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
 404static 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
 412static 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
 420static 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
 440static 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
 470static 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
 490static 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
 520static 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
 543static 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
 573static 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
 589static 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
 608static LM3533_ATTR_RW(als_channel);
 609static LM3533_ATTR_RW(als_en);
 610static LM3533_ATTR_RW(falltime);
 611static LM3533_ATTR_RO(id);
 612static LM3533_ATTR_RW(linear);
 613static LM3533_ATTR_RW(pwm);
 614static LM3533_ATTR_RW(risetime);
 615
 616static 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
 627static 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
 644static struct attribute_group lm3533_led_attribute_group = {
 645        .is_visible     = lm3533_led_attr_is_visible,
 646        .attrs          = lm3533_led_attributes
 647};
 648
 649static int __devinit 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
 661static int __devinit 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
 736err_sysfs_remove:
 737        sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
 738err_unregister:
 739        led_classdev_unregister(&led->cdev);
 740        flush_work_sync(&led->work);
 741
 742        return ret;
 743}
 744
 745static int __devexit 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_sync(&led->work);
 755
 756        return 0;
 757}
 758
 759static 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_sync(&led->work);
 769}
 770
 771static struct platform_driver lm3533_led_driver = {
 772        .driver = {
 773                .name = "lm3533-leds",
 774                .owner = THIS_MODULE,
 775        },
 776        .probe          = lm3533_led_probe,
 777        .remove         = __devexit_p(lm3533_led_remove),
 778        .shutdown       = lm3533_led_shutdown,
 779};
 780module_platform_driver(lm3533_led_driver);
 781
 782MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 783MODULE_DESCRIPTION("LM3533 LED driver");
 784MODULE_LICENSE("GPL");
 785MODULE_ALIAS("platform:lm3533-leds");
 786
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