drivers/leds/leds-blinkm.c

   1 /*
   2  *  leds-blinkm.c
   3  *  (c) Jan-Simon Möller (dl9pf@gmx.de)
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/slab.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/i2c.h>
  25 #include <linux/err.h>
  26 #include <linux/mutex.h>
  27 #include <linux/sysfs.h>
  28 #include <linux/printk.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/leds.h>
  31 #include <linux/delay.h>
  32
  33 /* Addresses to scan - BlinkM is on 0x09 by default*/
  34 static const unsigned short normal_i2c[] = { 0x09, I2C_CLIENT_END };
  35
  36 static int blinkm_transfer_hw(struct i2c_client *client, int cmd);
  37 static int blinkm_test_run(struct i2c_client *client);
  38
  39 struct blinkm_led {
  40         struct i2c_client *i2c_client;
  41         struct led_classdev led_cdev;
  42         int id;
  43         atomic_t active;
  44 };
  45
  46 struct blinkm_work {
  47         struct blinkm_led *blinkm_led;
  48         struct work_struct work;
  49 };
  50
  51 #define cdev_to_blmled(c)          container_of(c, struct blinkm_led, led_cdev)
  52 #define work_to_blmwork(c)         container_of(c, struct blinkm_work, work)
  53
  54 struct blinkm_data {
  55         struct i2c_client *i2c_client;
  56         struct mutex update_lock;
  57         /* used for led class interface */
  58         struct blinkm_led blinkm_leds[3];
  59         /* used for "blinkm" sysfs interface */
  60         u8 red;                 /* color red */
  61         u8 green;               /* color green */
  62         u8 blue;                /* color blue */
  63         /* next values to use for transfer */
  64         u8 next_red;                    /* color red */
  65         u8 next_green;          /* color green */
  66         u8 next_blue;           /* color blue */
  67         /* internal use */
  68         u8 args[7];             /* set of args for transmission */
  69         u8 i2c_addr;            /* i2c addr */
  70         u8 fw_ver;              /* firmware version */
  71         /* used, but not from userspace */
  72         u8 hue;                 /* HSB  hue */
  73         u8 saturation;          /* HSB  saturation */
  74         u8 brightness;          /* HSB  brightness */
  75         u8 next_hue;                    /* HSB  hue */
  76         u8 next_saturation;             /* HSB  saturation */
  77         u8 next_brightness;             /* HSB  brightness */
  78         /* currently unused / todo */
  79         u8 fade_speed;          /* fade speed     1 - 255 */
  80         s8 time_adjust;         /* time adjust -128 - 127 */
  81         u8 fade:1;              /* fade on = 1, off = 0 */
  82         u8 rand:1;              /* rand fade mode on = 1 */
  83         u8 script_id;           /* script ID */
  84         u8 script_repeats;      /* repeats of script */
  85         u8 script_startline;    /* line to start */
  86 };
  87
  88 /* Colors */
  89 #define RED   0
  90 #define GREEN 1
  91 #define BLUE  2
  92
  93 /* mapping command names to cmd chars - see datasheet */
  94 #define BLM_GO_RGB            0
  95 #define BLM_FADE_RGB          1
  96 #define BLM_FADE_HSB          2
  97 #define BLM_FADE_RAND_RGB     3
  98 #define BLM_FADE_RAND_HSB     4
  99 #define BLM_PLAY_SCRIPT       5
 100 #define BLM_STOP_SCRIPT       6
 101 #define BLM_SET_FADE_SPEED    7
 102 #define BLM_SET_TIME_ADJ      8
 103 #define BLM_GET_CUR_RGB       9
 104 #define BLM_WRITE_SCRIPT_LINE 10
 105 #define BLM_READ_SCRIPT_LINE  11
 106 #define BLM_SET_SCRIPT_LR     12        /* Length & Repeats */
 107 #define BLM_SET_ADDR          13
 108 #define BLM_GET_ADDR          14
 109 #define BLM_GET_FW_VER        15
 110 #define BLM_SET_STARTUP_PARAM 16
 111
 112 /* BlinkM Commands
 113  *  as extracted out of the datasheet:
 114  *
 115  *  cmdchar = command (ascii)
 116  *  cmdbyte = command in hex
 117  *  nr_args = number of arguments (to send)
 118  *  nr_ret  = number of return values (to read)
 119  *  dir = direction (0 = read, 1 = write, 2 = both)
 120  *
 121  */
 122 static const struct {
 123         char cmdchar;
 124         u8 cmdbyte;
 125         u8 nr_args;
 126         u8 nr_ret;
 127         u8 dir:2;
 128 } blinkm_cmds[17] = {
 129   /* cmdchar, cmdbyte, nr_args, nr_ret,  dir */
 130         { 'n', 0x6e, 3, 0, 1},
 131         { 'c', 0x63, 3, 0, 1},
 132         { 'h', 0x68, 3, 0, 1},
 133         { 'C', 0x43, 3, 0, 1},
 134         { 'H', 0x48, 3, 0, 1},
 135         { 'p', 0x70, 3, 0, 1},
 136         { 'o', 0x6f, 0, 0, 1},
 137         { 'f', 0x66, 1, 0, 1},
 138         { 't', 0x74, 1, 0, 1},
 139         { 'g', 0x67, 0, 3, 0},
 140         { 'W', 0x57, 7, 0, 1},
 141         { 'R', 0x52, 2, 5, 2},
 142         { 'L', 0x4c, 3, 0, 1},
 143         { 'A', 0x41, 4, 0, 1},
 144         { 'a', 0x61, 0, 1, 0},
 145         { 'Z', 0x5a, 0, 1, 0},
 146         { 'B', 0x42, 5, 0, 1},
 147 };
 148
 149 static ssize_t show_color_common(struct device *dev, char *buf, int color)
 150 {
 151         struct i2c_client *client;
 152         struct blinkm_data *data;
 153         int ret;
 154
 155         client = to_i2c_client(dev);
 156         data = i2c_get_clientdata(client);
 157
 158         ret = blinkm_transfer_hw(client, BLM_GET_CUR_RGB);
 159         if (ret < 0)
 160                 return ret;
 161         switch (color) {
 162         case RED:
 163                 return scnprintf(buf, PAGE_SIZE, "%02X\n", data->red);
 164         case GREEN:
 165                 return scnprintf(buf, PAGE_SIZE, "%02X\n", data->green);
 166         case BLUE:
 167                 return scnprintf(buf, PAGE_SIZE, "%02X\n", data->blue);
 168         default:
 169                 return -EINVAL;
 170         }
 171         return -EINVAL;
 172 }
 173
 174 static int store_color_common(struct device *dev, const char *buf, int color)
 175 {
 176         struct i2c_client *client;
 177         struct blinkm_data *data;
 178         int ret;
 179         u8 value;
 180
 181         client = to_i2c_client(dev);
 182         data = i2c_get_clientdata(client);
 183
 184         ret = kstrtou8(buf, 10, &value);
 185         if (ret < 0) {
 186                 dev_err(dev, "BlinkM: value too large!\n");
 187                 return ret;
 188         }
 189
 190         switch (color) {
 191         case RED:
 192                 data->next_red = value;
 193                 break;
 194         case GREEN:
 195                 data->next_green = value;
 196                 break;
 197         case BLUE:
 198                 data->next_blue = value;
 199                 break;
 200         default:
 201                 return -EINVAL;
 202         }
 203
 204         dev_dbg(dev, "next_red = %d, next_green = %d, next_blue = %d\n",
 205                         data->next_red, data->next_green, data->next_blue);
 206
 207         /* if mode ... */
 208         ret = blinkm_transfer_hw(client, BLM_GO_RGB);
 209         if (ret < 0) {
 210                 dev_err(dev, "BlinkM: can't set RGB\n");
 211                 return ret;
 212         }
 213         return 0;
 214 }
 215
 216 static ssize_t show_red(struct device *dev, struct device_attribute *attr,
 217                         char *buf)
 218 {
 219         return show_color_common(dev, buf, RED);
 220 }
 221
 222 static ssize_t store_red(struct device *dev, struct device_attribute *attr,
 223                          const char *buf, size_t count)
 224 {
 225         int ret;
 226
 227         ret = store_color_common(dev, buf, RED);
 228         if (ret < 0)
 229                 return ret;
 230         return count;
 231 }
 232
 233 static DEVICE_ATTR(red, S_IRUGO | S_IWUSR, show_red, store_red);
 234
 235 static ssize_t show_green(struct device *dev, struct device_attribute *attr,
 236                           char *buf)
 237 {
 238         return show_color_common(dev, buf, GREEN);
 239 }
 240
 241 static ssize_t store_green(struct device *dev, struct device_attribute *attr,
 242                            const char *buf, size_t count)
 243 {
 244
 245         int ret;
 246
 247         ret = store_color_common(dev, buf, GREEN);
 248         if (ret < 0)
 249                 return ret;
 250         return count;
 251 }
 252
 253 static DEVICE_ATTR(green, S_IRUGO | S_IWUSR, show_green, store_green);
 254
 255 static ssize_t show_blue(struct device *dev, struct device_attribute *attr,
 256                          char *buf)
 257 {
 258         return show_color_common(dev, buf, BLUE);
 259 }
 260
 261 static ssize_t store_blue(struct device *dev, struct device_attribute *attr,
 262                           const char *buf, size_t count)
 263 {
 264         int ret;
 265
 266         ret = store_color_common(dev, buf, BLUE);
 267         if (ret < 0)
 268                 return ret;
 269         return count;
 270 }
 271
 272 static DEVICE_ATTR(blue, S_IRUGO | S_IWUSR, show_blue, store_blue);
 273
 274 static ssize_t show_test(struct device *dev, struct device_attribute *attr,
 275                          char *buf)
 276 {
 277         return scnprintf(buf, PAGE_SIZE,
 278                          "#Write into test to start test sequence!#\n");
 279 }
 280
 281 static ssize_t store_test(struct device *dev, struct device_attribute *attr,
 282                           const char *buf, size_t count)
 283 {
 284
 285         struct i2c_client *client;
 286         int ret;
 287         client = to_i2c_client(dev);
 288
 289         /*test */
 290         ret = blinkm_test_run(client);
 291         if (ret < 0)
 292                 return ret;
 293
 294         return count;
 295 }
 296
 297 static DEVICE_ATTR(test, S_IRUGO | S_IWUSR, show_test, store_test);
 298
 299 /* TODO: HSB, fade, timeadj, script ... */
 300
 301 static struct attribute *blinkm_attrs[] = {
 302         &dev_attr_red.attr,
 303         &dev_attr_green.attr,
 304         &dev_attr_blue.attr,
 305         &dev_attr_test.attr,
 306         NULL,
 307 };
 308
 309 static struct attribute_group blinkm_group = {
 310         .name = "blinkm",
 311         .attrs = blinkm_attrs,
 312 };
 313
 314 static int blinkm_write(struct i2c_client *client, int cmd, u8 *arg)
 315 {
 316         int result;
 317         int i;
 318         int arglen = blinkm_cmds[cmd].nr_args;
 319         /* write out cmd to blinkm - always / default step */
 320         result = i2c_smbus_write_byte(client, blinkm_cmds[cmd].cmdbyte);
 321         if (result < 0)
 322                 return result;
 323         /* no args to write out */
 324         if (arglen == 0)
 325                 return 0;
 326
 327         for (i = 0; i < arglen; i++) {
 328                 /* repeat for arglen */
 329                 result = i2c_smbus_write_byte(client, arg[i]);
 330                 if (result < 0)
 331                         return result;
 332         }
 333         return 0;
 334 }
 335
 336 static int blinkm_read(struct i2c_client *client, int cmd, u8 *arg)
 337 {
 338         int result;
 339         int i;
 340         int retlen = blinkm_cmds[cmd].nr_ret;
 341         for (i = 0; i < retlen; i++) {
 342                 /* repeat for retlen */
 343                 result = i2c_smbus_read_byte(client);
 344                 if (result < 0)
 345                         return result;
 346                 arg[i] = result;
 347         }
 348
 349         return 0;
 350 }
 351
 352 static int blinkm_transfer_hw(struct i2c_client *client, int cmd)
 353 {
 354         /* the protocol is simple but non-standard:
 355          * e.g.  cmd 'g' (= 0x67) for "get device address"
 356          * - which defaults to 0x09 - would be the sequence:
 357          *   a) write 0x67 to the device (byte write)
 358          *   b) read the value (0x09) back right after (byte read)
 359          *
 360          * Watch out for "unfinished" sequences (i.e. not enough reads
 361          * or writes after a command. It will make the blinkM misbehave.
 362          * Sequence is key here.
 363          */
 364
 365         /* args / return are in private data struct */
 366         struct blinkm_data *data = i2c_get_clientdata(client);
 367
 368         /* We start hardware transfers which are not to be
 369          * mixed with other commands. Aquire a lock now. */
 370         if (mutex_lock_interruptible(&data->update_lock) < 0)
 371                 return -EAGAIN;
 372
 373         /* switch cmd - usually write before reads */
 374         switch (cmd) {
 375         case BLM_FADE_RAND_RGB:
 376         case BLM_GO_RGB:
 377         case BLM_FADE_RGB:
 378                 data->args[0] = data->next_red;
 379                 data->args[1] = data->next_green;
 380                 data->args[2] = data->next_blue;
 381                 blinkm_write(client, cmd, data->args);
 382                 data->red = data->args[0];
 383                 data->green = data->args[1];
 384                 data->blue = data->args[2];
 385                 break;
 386         case BLM_FADE_HSB:
 387         case BLM_FADE_RAND_HSB:
 388                 data->args[0] = data->next_hue;
 389                 data->args[1] = data->next_saturation;
 390                 data->args[2] = data->next_brightness;
 391                 blinkm_write(client, cmd, data->args);
 392                 data->hue = data->next_hue;
 393                 data->saturation = data->next_saturation;
 394                 data->brightness = data->next_brightness;
 395                 break;
 396         case BLM_PLAY_SCRIPT:
 397                 data->args[0] = data->script_id;
 398                 data->args[1] = data->script_repeats;
 399                 data->args[2] = data->script_startline;
 400                 blinkm_write(client, cmd, data->args);
 401                 break;
 402         case BLM_STOP_SCRIPT:
 403                 blinkm_write(client, cmd, NULL);
 404                 break;
 405         case BLM_GET_CUR_RGB:
 406                 data->args[0] = data->red;
 407                 data->args[1] = data->green;
 408                 data->args[2] = data->blue;
 409                 blinkm_write(client, cmd, NULL);
 410                 blinkm_read(client, cmd, data->args);
 411                 data->red = data->args[0];
 412                 data->green = data->args[1];
 413                 data->blue = data->args[2];
 414                 break;
 415         case BLM_GET_ADDR:
 416                 data->args[0] = data->i2c_addr;
 417                 blinkm_write(client, cmd, NULL);
 418                 blinkm_read(client, cmd, data->args);
 419                 data->i2c_addr = data->args[0];
 420                 break;
 421         case BLM_SET_TIME_ADJ:
 422         case BLM_SET_FADE_SPEED:
 423         case BLM_READ_SCRIPT_LINE:
 424         case BLM_WRITE_SCRIPT_LINE:
 425         case BLM_SET_SCRIPT_LR:
 426         case BLM_SET_ADDR:
 427         case BLM_GET_FW_VER:
 428         case BLM_SET_STARTUP_PARAM:
 429                 dev_err(&client->dev,
 430                                 "BlinkM: cmd %d not implemented yet.\n", cmd);
 431                 break;
 432         default:
 433                 dev_err(&client->dev, "BlinkM: unknown command %d\n", cmd);
 434                 mutex_unlock(&data->update_lock);
 435                 return -EINVAL;
 436         }                       /* end switch(cmd) */
 437
 438         /* transfers done, unlock */
 439         mutex_unlock(&data->update_lock);
 440         return 0;
 441 }
 442
 443 static void led_work(struct work_struct *work)
 444 {
 445         int ret;
 446         struct blinkm_led *led;
 447         struct blinkm_data *data ;
 448         struct blinkm_work *blm_work = work_to_blmwork(work);
 449
 450         led = blm_work->blinkm_led;
 451         data = i2c_get_clientdata(led->i2c_client);
 452         ret = blinkm_transfer_hw(led->i2c_client, BLM_GO_RGB);
 453         atomic_dec(&led->active);
 454         dev_dbg(&led->i2c_client->dev,
 455                         "# DONE # next_red = %d, next_green = %d,"
 456                         " next_blue = %d, active = %d\n",
 457                         data->next_red, data->next_green,
 458                         data->next_blue, atomic_read(&led->active));
 459         kfree(blm_work);
 460 }
 461
 462 static int blinkm_led_common_set(struct led_classdev *led_cdev,
 463                                  enum led_brightness value, int color)
 464 {
 465         /* led_brightness is 0, 127 or 255 - we just use it here as-is */
 466         struct blinkm_led *led = cdev_to_blmled(led_cdev);
 467         struct blinkm_data *data = i2c_get_clientdata(led->i2c_client);
 468         struct blinkm_work *bl_work;
 469
 470         switch (color) {
 471         case RED:
 472                 /* bail out if there's no change */
 473                 if (data->next_red == (u8) value)
 474                         return 0;
 475                 /* we assume a quite fast sequence here ([off]->on->off)
 476                  * think of network led trigger - we cannot blink that fast, so
 477                  * in case we already have a off->on->off transition queued up,
 478                  * we refuse to queue up more.
 479                  * Revisit: fast-changing brightness. */
 480                 if (atomic_read(&led->active) > 1)
 481                         return 0;
 482                 data->next_red = (u8) value;
 483                 break;
 484         case GREEN:
 485                 /* bail out if there's no change */
 486                 if (data->next_green == (u8) value)
 487                         return 0;
 488                 /* we assume a quite fast sequence here ([off]->on->off)
 489                  * Revisit: fast-changing brightness. */
 490                 if (atomic_read(&led->active) > 1)
 491                         return 0;
 492                 data->next_green = (u8) value;
 493                 break;
 494         case BLUE:
 495                 /* bail out if there's no change */
 496                 if (data->next_blue == (u8) value)
 497                         return 0;
 498                 /* we assume a quite fast sequence here ([off]->on->off)
 499                  * Revisit: fast-changing brightness. */
 500                 if (atomic_read(&led->active) > 1)
 501                         return 0;
 502                 data->next_blue = (u8) value;
 503                 break;
 504
 505         default:
 506                 dev_err(&led->i2c_client->dev, "BlinkM: unknown color.\n");
 507                 return -EINVAL;
 508         }
 509
 510         bl_work = kzalloc(sizeof(*bl_work), GFP_ATOMIC);
 511         if (!bl_work)
 512                 return -ENOMEM;
 513
 514         atomic_inc(&led->active);
 515         dev_dbg(&led->i2c_client->dev,
 516                         "#TO_SCHED# next_red = %d, next_green = %d,"
 517                         " next_blue = %d, active = %d\n",
 518                         data->next_red, data->next_green,
 519                         data->next_blue, atomic_read(&led->active));
 520
 521         /* a fresh work _item_ for each change */
 522         bl_work->blinkm_led = led;
 523         INIT_WORK(&bl_work->work, led_work);
 524         /* queue work in own queue for easy sync on exit*/
 525         schedule_work(&bl_work->work);
 526
 527         return 0;
 528 }
 529
 530 static void blinkm_led_red_set(struct led_classdev *led_cdev,
 531                                enum led_brightness value)
 532 {
 533         blinkm_led_common_set(led_cdev, value, RED);
 534 }
 535
 536 static void blinkm_led_green_set(struct led_classdev *led_cdev,
 537                                  enum led_brightness value)
 538 {
 539         blinkm_led_common_set(led_cdev, value, GREEN);
 540 }
 541
 542 static void blinkm_led_blue_set(struct led_classdev *led_cdev,
 543                                 enum led_brightness value)
 544 {
 545         blinkm_led_common_set(led_cdev, value, BLUE);
 546 }
 547
 548 static void blinkm_init_hw(struct i2c_client *client)
 549 {
 550         int ret;
 551         ret = blinkm_transfer_hw(client, BLM_STOP_SCRIPT);
 552         ret = blinkm_transfer_hw(client, BLM_GO_RGB);
 553 }
 554
 555 static int blinkm_test_run(struct i2c_client *client)
 556 {
 557         int ret;
 558         struct blinkm_data *data = i2c_get_clientdata(client);
 559
 560         data->next_red = 0x01;
 561         data->next_green = 0x05;
 562         data->next_blue = 0x10;
 563         ret = blinkm_transfer_hw(client, BLM_GO_RGB);
 564         if (ret < 0)
 565                 return ret;
 566         msleep(2000);
 567
 568         data->next_red = 0x25;
 569         data->next_green = 0x10;
 570         data->next_blue = 0x31;
 571         ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
 572         if (ret < 0)
 573                 return ret;
 574         msleep(2000);
 575
 576         data->next_hue = 0x50;
 577         data->next_saturation = 0x10;
 578         data->next_brightness = 0x20;
 579         ret = blinkm_transfer_hw(client, BLM_FADE_HSB);
 580         if (ret < 0)
 581                 return ret;
 582         msleep(2000);
 583
 584         return 0;
 585 }
 586
 587 /* Return 0 if detection is successful, -ENODEV otherwise */
 588 static int blinkm_detect(struct i2c_client *client, struct i2c_board_info *info)
 589 {
 590         struct i2c_adapter *adapter = client->adapter;
 591         int ret;
 592         int count = 99;
 593         u8 tmpargs[7];
 594
 595         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 596                                      | I2C_FUNC_SMBUS_WORD_DATA
 597                                      | I2C_FUNC_SMBUS_WRITE_BYTE))
 598                 return -ENODEV;
 599
 600         /* Now, we do the remaining detection. Simple for now. */
 601         /* We might need more guards to protect other i2c slaves */
 602
 603         /* make sure the blinkM is balanced (read/writes) */
 604         while (count > 0) {
 605                 ret = blinkm_write(client, BLM_GET_ADDR, NULL);
 606                 usleep_range(5000, 10000);
 607                 ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
 608                 usleep_range(5000, 10000);
 609                 if (tmpargs[0] == 0x09)
 610                         count = 0;
 611                 count--;
 612         }
 613
 614         /* Step 1: Read BlinkM address back  -  cmd_char 'a' */
 615         ret = blinkm_write(client, BLM_GET_ADDR, NULL);
 616         if (ret < 0)
 617                 return ret;
 618         usleep_range(20000, 30000);     /* allow a small delay */
 619         ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
 620         if (ret < 0)
 621                 return ret;
 622
 623         if (tmpargs[0] != 0x09) {
 624                 dev_err(&client->dev, "enodev DEV ADDR = 0x%02X\n", tmpargs[0]);
 625                 return -ENODEV;
 626         }
 627
 628         strlcpy(info->type, "blinkm", I2C_NAME_SIZE);
 629         return 0;
 630 }
 631
 632 static int blinkm_probe(struct i2c_client *client,
 633                         const struct i2c_device_id *id)
 634 {
 635         struct blinkm_data *data;
 636         struct blinkm_led *led[3];
 637         int err, i;
 638         char blinkm_led_name[28];
 639
 640         data = devm_kzalloc(&client->dev,
 641                         sizeof(struct blinkm_data), GFP_KERNEL);
 642         if (!data) {
 643                 err = -ENOMEM;
 644                 goto exit;
 645         }
 646
 647         data->i2c_addr = 0x09;
 648         data->i2c_addr = 0x08;
 649         /* i2c addr  - use fake addr of 0x08 initially (real is 0x09) */
 650         data->fw_ver = 0xfe;
 651         /* firmware version - use fake until we read real value
 652          * (currently broken - BlinkM confused!) */
 653         data->script_id = 0x01;
 654         data->i2c_client = client;
 655
 656         i2c_set_clientdata(client, data);
 657         mutex_init(&data->update_lock);
 658
 659         /* Register sysfs hooks */
 660         err = sysfs_create_group(&client->dev.kobj, &blinkm_group);
 661         if (err < 0) {
 662                 dev_err(&client->dev, "couldn't register sysfs group\n");
 663                 goto exit;
 664         }
 665
 666         for (i = 0; i < 3; i++) {
 667                 /* RED = 0, GREEN = 1, BLUE = 2 */
 668                 led[i] = &data->blinkm_leds[i];
 669                 led[i]->i2c_client = client;
 670                 led[i]->id = i;
 671                 led[i]->led_cdev.max_brightness = 255;
 672                 led[i]->led_cdev.flags = LED_CORE_SUSPENDRESUME;
 673                 atomic_set(&led[i]->active, 0);
 674                 switch (i) {
 675                 case RED:
 676                         snprintf(blinkm_led_name, sizeof(blinkm_led_name),
 677                                          "blinkm-%d-%d-red",
 678                                          client->adapter->nr,
 679                                          client->addr);
 680                         led[i]->led_cdev.name = blinkm_led_name;
 681                         led[i]->led_cdev.brightness_set = blinkm_led_red_set;
 682                         err = led_classdev_register(&client->dev,
 683                                                     &led[i]->led_cdev);
 684                         if (err < 0) {
 685                                 dev_err(&client->dev,
 686                                         "couldn't register LED %s\n",
 687                                         led[i]->led_cdev.name);
 688                                 goto failred;
 689                         }
 690                         break;
 691                 case GREEN:
 692                         snprintf(blinkm_led_name, sizeof(blinkm_led_name),
 693                                          "blinkm-%d-%d-green",
 694                                          client->adapter->nr,
 695                                          client->addr);
 696                         led[i]->led_cdev.name = blinkm_led_name;
 697                         led[i]->led_cdev.brightness_set = blinkm_led_green_set;
 698                         err = led_classdev_register(&client->dev,
 699                                                     &led[i]->led_cdev);
 700                         if (err < 0) {
 701                                 dev_err(&client->dev,
 702                                         "couldn't register LED %s\n",
 703                                         led[i]->led_cdev.name);
 704                                 goto failgreen;
 705                         }
 706                         break;
 707                 case BLUE:
 708                         snprintf(blinkm_led_name, sizeof(blinkm_led_name),
 709                                          "blinkm-%d-%d-blue",
 710                                          client->adapter->nr,
 711                                          client->addr);
 712                         led[i]->led_cdev.name = blinkm_led_name;
 713                         led[i]->led_cdev.brightness_set = blinkm_led_blue_set;
 714                         err = led_classdev_register(&client->dev,
 715                                                     &led[i]->led_cdev);
 716                         if (err < 0) {
 717                                 dev_err(&client->dev,
 718                                         "couldn't register LED %s\n",
 719                                         led[i]->led_cdev.name);
 720                                 goto failblue;
 721                         }
 722                         break;
 723                 }               /* end switch */
 724         }                       /* end for */
 725
 726         /* Initialize the blinkm */
 727         blinkm_init_hw(client);
 728
 729         return 0;
 730
 731 failblue:
 732         led_classdev_unregister(&led[GREEN]->led_cdev);
 733
 734 failgreen:
 735         led_classdev_unregister(&led[RED]->led_cdev);
 736
 737 failred:
 738         sysfs_remove_group(&client->dev.kobj, &blinkm_group);
 739 exit:
 740         return err;
 741 }
 742
 743 static int blinkm_remove(struct i2c_client *client)
 744 {
 745         struct blinkm_data *data = i2c_get_clientdata(client);
 746         int ret = 0;
 747         int i;
 748
 749         /* make sure no workqueue entries are pending */
 750         for (i = 0; i < 3; i++) {
 751                 flush_scheduled_work();
 752                 led_classdev_unregister(&data->blinkm_leds[i].led_cdev);
 753         }
 754
 755         /* reset rgb */
 756         data->next_red = 0x00;
 757         data->next_green = 0x00;
 758         data->next_blue = 0x00;
 759         ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
 760         if (ret < 0)
 761                 dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
 762
 763         /* reset hsb */
 764         data->next_hue = 0x00;
 765         data->next_saturation = 0x00;
 766         data->next_brightness = 0x00;
 767         ret = blinkm_transfer_hw(client, BLM_FADE_HSB);
 768         if (ret < 0)
 769                 dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
 770
 771         /* red fade to off */
 772         data->next_red = 0xff;
 773         ret = blinkm_transfer_hw(client, BLM_GO_RGB);
 774         if (ret < 0)
 775                 dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
 776
 777         /* off */
 778         data->next_red = 0x00;
 779         ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
 780         if (ret < 0)
 781                 dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
 782
 783         sysfs_remove_group(&client->dev.kobj, &blinkm_group);
 784         return 0;
 785 }
 786
 787 static const struct i2c_device_id blinkm_id[] = {
 788         {"blinkm", 0},
 789         {}
 790 };
 791
 792 MODULE_DEVICE_TABLE(i2c, blinkm_id);
 793
 794   /* This is the driver that will be inserted */
 795 static struct i2c_driver blinkm_driver = {
 796         .class = I2C_CLASS_HWMON,
 797         .driver = {
 798                    .name = "blinkm",
 799                    },
 800         .probe = blinkm_probe,
 801         .remove = blinkm_remove,
 802         .id_table = blinkm_id,
 803         .detect = blinkm_detect,
 804         .address_list = normal_i2c,
 805 };
 806
 807 module_i2c_driver(blinkm_driver);
 808
 809 MODULE_AUTHOR("Jan-Simon Moeller <dl9pf@gmx.de>");
 810 MODULE_DESCRIPTION("BlinkM RGB LED driver");
 811 MODULE_LICENSE("GPL");
 812