drivers/video/backlight/lm3630a_bl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3 * Simple driver for Texas Instruments LM3630A Backlight driver chip
   4 * Copyright (C) 2012 Texas Instruments
   5 */
   6 #include <linux/module.h>
   7 #include <linux/slab.h>
   8 #include <linux/i2c.h>
   9 #include <linux/backlight.h>
  10 #include <linux/err.h>
  11 #include <linux/delay.h>
  12 #include <linux/uaccess.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/regmap.h>
  15 #include <linux/gpio/consumer.h>
  16 #include <linux/pwm.h>
  17 #include <linux/platform_data/lm3630a_bl.h>
  18
  19 #define REG_CTRL        0x00
  20 #define REG_BOOST       0x02
  21 #define REG_CONFIG      0x01
  22 #define REG_BRT_A       0x03
  23 #define REG_BRT_B       0x04
  24 #define REG_I_A         0x05
  25 #define REG_I_B         0x06
  26 #define REG_INT_STATUS  0x09
  27 #define REG_INT_EN      0x0A
  28 #define REG_FAULT       0x0B
  29 #define REG_PWM_OUTLOW  0x12
  30 #define REG_PWM_OUTHIGH 0x13
  31 #define REG_FILTER_STRENGTH     0x50
  32 #define REG_MAX         0x50
  33
  34 #define INT_DEBOUNCE_MSEC       10
  35
  36 #define LM3630A_BANK_0          0
  37 #define LM3630A_BANK_1          1
  38
  39 #define LM3630A_NUM_SINKS       2
  40 #define LM3630A_SINK_0          0
  41 #define LM3630A_SINK_1          1
  42
  43 struct lm3630a_chip {
  44         struct device *dev;
  45         struct delayed_work work;
  46
  47         int irq;
  48         struct workqueue_struct *irqthread;
  49         struct lm3630a_platform_data *pdata;
  50         struct backlight_device *bleda;
  51         struct backlight_device *bledb;
  52         struct gpio_desc *enable_gpio;
  53         struct regmap *regmap;
  54         struct pwm_device *pwmd;
  55 };
  56
  57 /* i2c access */
  58 static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)
  59 {
  60         int rval;
  61         unsigned int reg_val;
  62
  63         rval = regmap_read(pchip->regmap, reg, &reg_val);
  64         if (rval < 0)
  65                 return rval;
  66         return reg_val & 0xFF;
  67 }
  68
  69 static int lm3630a_write(struct lm3630a_chip *pchip,
  70                          unsigned int reg, unsigned int data)
  71 {
  72         return regmap_write(pchip->regmap, reg, data);
  73 }
  74
  75 static int lm3630a_update(struct lm3630a_chip *pchip,
  76                           unsigned int reg, unsigned int mask,
  77                           unsigned int data)
  78 {
  79         return regmap_update_bits(pchip->regmap, reg, mask, data);
  80 }
  81
  82 /* initialize chip */
  83 static int lm3630a_chip_init(struct lm3630a_chip *pchip)
  84 {
  85         int rval;
  86         struct lm3630a_platform_data *pdata = pchip->pdata;
  87
  88         usleep_range(1000, 2000);
  89         /* set Filter Strength Register */
  90         rval = lm3630a_write(pchip, REG_FILTER_STRENGTH, 0x03);
  91         /* set Cofig. register */
  92         rval |= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
  93         /* set boost control */
  94         rval |= lm3630a_write(pchip, REG_BOOST, 0x38);
  95         /* set current A */
  96         rval |= lm3630a_update(pchip, REG_I_A, 0x1F, 0x1F);
  97         /* set current B */
  98         rval |= lm3630a_write(pchip, REG_I_B, 0x1F);
  99         /* set control */
 100         rval |= lm3630a_update(pchip, REG_CTRL, 0x14, pdata->leda_ctrl);
 101         rval |= lm3630a_update(pchip, REG_CTRL, 0x0B, pdata->ledb_ctrl);
 102         usleep_range(1000, 2000);
 103         /* set brightness A and B */
 104         rval |= lm3630a_write(pchip, REG_BRT_A, pdata->leda_init_brt);
 105         rval |= lm3630a_write(pchip, REG_BRT_B, pdata->ledb_init_brt);
 106
 107         if (rval < 0)
 108                 dev_err(pchip->dev, "i2c failed to access register\n");
 109         return rval;
 110 }
 111
 112 /* interrupt handling */
 113 static void lm3630a_delayed_func(struct work_struct *work)
 114 {
 115         int rval;
 116         struct lm3630a_chip *pchip;
 117
 118         pchip = container_of(work, struct lm3630a_chip, work.work);
 119
 120         rval = lm3630a_read(pchip, REG_INT_STATUS);
 121         if (rval < 0) {
 122                 dev_err(pchip->dev,
 123                         "i2c failed to access REG_INT_STATUS Register\n");
 124                 return;
 125         }
 126
 127         dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", rval);
 128 }
 129
 130 static irqreturn_t lm3630a_isr_func(int irq, void *chip)
 131 {
 132         int rval;
 133         struct lm3630a_chip *pchip = chip;
 134         unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
 135
 136         queue_delayed_work(pchip->irqthread, &pchip->work, delay);
 137
 138         rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
 139         if (rval < 0) {
 140                 dev_err(pchip->dev, "i2c failed to access register\n");
 141                 return IRQ_NONE;
 142         }
 143         return IRQ_HANDLED;
 144 }
 145
 146 static int lm3630a_intr_config(struct lm3630a_chip *pchip)
 147 {
 148         int rval;
 149
 150         rval = lm3630a_write(pchip, REG_INT_EN, 0x87);
 151         if (rval < 0)
 152                 return rval;
 153
 154         INIT_DELAYED_WORK(&pchip->work, lm3630a_delayed_func);
 155         pchip->irqthread = create_singlethread_workqueue("lm3630a-irqthd");
 156         if (!pchip->irqthread) {
 157                 dev_err(pchip->dev, "create irq thread fail\n");
 158                 return -ENOMEM;
 159         }
 160         if (request_threaded_irq
 161             (pchip->irq, NULL, lm3630a_isr_func,
 162              IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630a_irq", pchip)) {
 163                 dev_err(pchip->dev, "request threaded irq fail\n");
 164                 destroy_workqueue(pchip->irqthread);
 165                 return -ENOMEM;
 166         }
 167         return rval;
 168 }
 169
 170 static void lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
 171 {
 172         unsigned int period = pchip->pdata->pwm_period;
 173         unsigned int duty = br * period / br_max;
 174
 175         pwm_config(pchip->pwmd, duty, period);
 176         if (duty)
 177                 pwm_enable(pchip->pwmd);
 178         else
 179                 pwm_disable(pchip->pwmd);
 180 }
 181
 182 /* update and get brightness */
 183 static int lm3630a_bank_a_update_status(struct backlight_device *bl)
 184 {
 185         int ret;
 186         struct lm3630a_chip *pchip = bl_get_data(bl);
 187         enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
 188
 189         /* pwm control */
 190         if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
 191                 lm3630a_pwm_ctrl(pchip, bl->props.brightness,
 192                                  bl->props.max_brightness);
 193                 return bl->props.brightness;
 194         }
 195
 196         /* disable sleep */
 197         ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
 198         if (ret < 0)
 199                 goto out_i2c_err;
 200         usleep_range(1000, 2000);
 201         /* minimum brightness is 0x04 */
 202         ret = lm3630a_write(pchip, REG_BRT_A, bl->props.brightness);
 203         if (bl->props.brightness < 0x4)
 204                 ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDA_ENABLE, 0);
 205         else
 206                 ret |= lm3630a_update(pchip, REG_CTRL,
 207                                       LM3630A_LEDA_ENABLE, LM3630A_LEDA_ENABLE);
 208         if (ret < 0)
 209                 goto out_i2c_err;
 210         return 0;
 211
 212 out_i2c_err:
 213         dev_err(pchip->dev, "i2c failed to access\n");
 214         return bl->props.brightness;
 215 }
 216
 217 static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
 218 {
 219         int brightness, rval;
 220         struct lm3630a_chip *pchip = bl_get_data(bl);
 221         enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
 222
 223         if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
 224                 rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
 225                 if (rval < 0)
 226                         goto out_i2c_err;
 227                 brightness = (rval & 0x01) << 8;
 228                 rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
 229                 if (rval < 0)
 230                         goto out_i2c_err;
 231                 brightness |= rval;
 232                 goto out;
 233         }
 234
 235         /* disable sleep */
 236         rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
 237         if (rval < 0)
 238                 goto out_i2c_err;
 239         usleep_range(1000, 2000);
 240         rval = lm3630a_read(pchip, REG_BRT_A);
 241         if (rval < 0)
 242                 goto out_i2c_err;
 243         brightness = rval;
 244
 245 out:
 246         bl->props.brightness = brightness;
 247         return bl->props.brightness;
 248 out_i2c_err:
 249         dev_err(pchip->dev, "i2c failed to access register\n");
 250         return 0;
 251 }
 252
 253 static const struct backlight_ops lm3630a_bank_a_ops = {
 254         .options = BL_CORE_SUSPENDRESUME,
 255         .update_status = lm3630a_bank_a_update_status,
 256         .get_brightness = lm3630a_bank_a_get_brightness,
 257 };
 258
 259 /* update and get brightness */
 260 static int lm3630a_bank_b_update_status(struct backlight_device *bl)
 261 {
 262         int ret;
 263         struct lm3630a_chip *pchip = bl_get_data(bl);
 264         enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
 265
 266         /* pwm control */
 267         if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
 268                 lm3630a_pwm_ctrl(pchip, bl->props.brightness,
 269                                  bl->props.max_brightness);
 270                 return bl->props.brightness;
 271         }
 272
 273         /* disable sleep */
 274         ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
 275         if (ret < 0)
 276                 goto out_i2c_err;
 277         usleep_range(1000, 2000);
 278         /* minimum brightness is 0x04 */
 279         ret = lm3630a_write(pchip, REG_BRT_B, bl->props.brightness);
 280         if (bl->props.brightness < 0x4)
 281                 ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
 282         else
 283                 ret |= lm3630a_update(pchip, REG_CTRL,
 284                                       LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
 285         if (ret < 0)
 286                 goto out_i2c_err;
 287         return 0;
 288
 289 out_i2c_err:
 290         dev_err(pchip->dev, "i2c failed to access REG_CTRL\n");
 291         return bl->props.brightness;
 292 }
 293
 294 static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
 295 {
 296         int brightness, rval;
 297         struct lm3630a_chip *pchip = bl_get_data(bl);
 298         enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
 299
 300         if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
 301                 rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
 302                 if (rval < 0)
 303                         goto out_i2c_err;
 304                 brightness = (rval & 0x01) << 8;
 305                 rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
 306                 if (rval < 0)
 307                         goto out_i2c_err;
 308                 brightness |= rval;
 309                 goto out;
 310         }
 311
 312         /* disable sleep */
 313         rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
 314         if (rval < 0)
 315                 goto out_i2c_err;
 316         usleep_range(1000, 2000);
 317         rval = lm3630a_read(pchip, REG_BRT_B);
 318         if (rval < 0)
 319                 goto out_i2c_err;
 320         brightness = rval;
 321
 322 out:
 323         bl->props.brightness = brightness;
 324         return bl->props.brightness;
 325 out_i2c_err:
 326         dev_err(pchip->dev, "i2c failed to access register\n");
 327         return 0;
 328 }
 329
 330 static const struct backlight_ops lm3630a_bank_b_ops = {
 331         .options = BL_CORE_SUSPENDRESUME,
 332         .update_status = lm3630a_bank_b_update_status,
 333         .get_brightness = lm3630a_bank_b_get_brightness,
 334 };
 335
 336 static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
 337 {
 338         struct lm3630a_platform_data *pdata = pchip->pdata;
 339         struct backlight_properties props;
 340         const char *label;
 341
 342         props.type = BACKLIGHT_RAW;
 343         if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
 344                 props.brightness = pdata->leda_init_brt;
 345                 props.max_brightness = pdata->leda_max_brt;
 346                 label = pdata->leda_label ? pdata->leda_label : "lm3630a_leda";
 347                 pchip->bleda =
 348                     devm_backlight_device_register(pchip->dev, label,
 349                                                    pchip->dev, pchip,
 350                                                    &lm3630a_bank_a_ops, &props);
 351                 if (IS_ERR(pchip->bleda))
 352                         return PTR_ERR(pchip->bleda);
 353         }
 354
 355         if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
 356             (pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
 357                 props.brightness = pdata->ledb_init_brt;
 358                 props.max_brightness = pdata->ledb_max_brt;
 359                 label = pdata->ledb_label ? pdata->ledb_label : "lm3630a_ledb";
 360                 pchip->bledb =
 361                     devm_backlight_device_register(pchip->dev, label,
 362                                                    pchip->dev, pchip,
 363                                                    &lm3630a_bank_b_ops, &props);
 364                 if (IS_ERR(pchip->bledb))
 365                         return PTR_ERR(pchip->bledb);
 366         }
 367         return 0;
 368 }
 369
 370 static const struct regmap_config lm3630a_regmap = {
 371         .reg_bits = 8,
 372         .val_bits = 8,
 373         .max_register = REG_MAX,
 374 };
 375
 376 static int lm3630a_parse_led_sources(struct fwnode_handle *node,
 377                                      int default_led_sources)
 378 {
 379         u32 sources[LM3630A_NUM_SINKS];
 380         int ret, num_sources, i;
 381
 382         num_sources = fwnode_property_count_u32(node, "led-sources");
 383         if (num_sources < 0)
 384                 return default_led_sources;
 385         else if (num_sources > ARRAY_SIZE(sources))
 386                 return -EINVAL;
 387
 388         ret = fwnode_property_read_u32_array(node, "led-sources", sources,
 389                                              num_sources);
 390         if (ret)
 391                 return ret;
 392
 393         for (i = 0; i < num_sources; i++) {
 394                 if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
 395                         return -EINVAL;
 396
 397                 ret |= BIT(sources[i]);
 398         }
 399
 400         return ret;
 401 }
 402
 403 static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
 404                               struct fwnode_handle *node, int *seen_led_sources)
 405 {
 406         int led_sources, ret;
 407         const char *label;
 408         u32 bank, val;
 409         bool linear;
 410
 411         ret = fwnode_property_read_u32(node, "reg", &bank);
 412         if (ret)
 413                 return ret;
 414
 415         if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
 416                 return -EINVAL;
 417
 418         led_sources = lm3630a_parse_led_sources(node, BIT(bank));
 419         if (led_sources < 0)
 420                 return led_sources;
 421
 422         if (*seen_led_sources & led_sources)
 423                 return -EINVAL;
 424
 425         *seen_led_sources |= led_sources;
 426
 427         linear = fwnode_property_read_bool(node,
 428                                            "ti,linear-mapping-mode");
 429         if (bank) {
 430                 if (led_sources & BIT(LM3630A_SINK_0) ||
 431                     !(led_sources & BIT(LM3630A_SINK_1)))
 432                         return -EINVAL;
 433
 434                 pdata->ledb_ctrl = linear ?
 435                         LM3630A_LEDB_ENABLE_LINEAR :
 436                         LM3630A_LEDB_ENABLE;
 437         } else {
 438                 if (!(led_sources & BIT(LM3630A_SINK_0)))
 439                         return -EINVAL;
 440
 441                 pdata->leda_ctrl = linear ?
 442                         LM3630A_LEDA_ENABLE_LINEAR :
 443                         LM3630A_LEDA_ENABLE;
 444
 445                 if (led_sources & BIT(LM3630A_SINK_1))
 446                         pdata->ledb_ctrl = LM3630A_LEDB_ON_A;
 447         }
 448
 449         ret = fwnode_property_read_string(node, "label", &label);
 450         if (!ret) {
 451                 if (bank)
 452                         pdata->ledb_label = label;
 453                 else
 454                         pdata->leda_label = label;
 455         }
 456
 457         ret = fwnode_property_read_u32(node, "default-brightness",
 458                                        &val);
 459         if (!ret) {
 460                 if (bank)
 461                         pdata->ledb_init_brt = val;
 462                 else
 463                         pdata->leda_init_brt = val;
 464         }
 465
 466         ret = fwnode_property_read_u32(node, "max-brightness", &val);
 467         if (!ret) {
 468                 if (bank)
 469                         pdata->ledb_max_brt = val;
 470                 else
 471                         pdata->leda_max_brt = val;
 472         }
 473
 474         return 0;
 475 }
 476
 477 static int lm3630a_parse_node(struct lm3630a_chip *pchip,
 478                               struct lm3630a_platform_data *pdata)
 479 {
 480         int ret = -ENODEV, seen_led_sources = 0;
 481         struct fwnode_handle *node;
 482
 483         device_for_each_child_node(pchip->dev, node) {
 484                 ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
 485                 if (ret)
 486                         return ret;
 487         }
 488
 489         return ret;
 490 }
 491
 492 static int lm3630a_probe(struct i2c_client *client,
 493                          const struct i2c_device_id *id)
 494 {
 495         struct lm3630a_platform_data *pdata = dev_get_platdata(&client->dev);
 496         struct lm3630a_chip *pchip;
 497         int rval;
 498
 499         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 500                 dev_err(&client->dev, "fail : i2c functionality check\n");
 501                 return -EOPNOTSUPP;
 502         }
 503
 504         pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630a_chip),
 505                              GFP_KERNEL);
 506         if (!pchip)
 507                 return -ENOMEM;
 508         pchip->dev = &client->dev;
 509
 510         pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
 511         if (IS_ERR(pchip->regmap)) {
 512                 rval = PTR_ERR(pchip->regmap);
 513                 dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
 514                 return rval;
 515         }
 516
 517         i2c_set_clientdata(client, pchip);
 518         if (pdata == NULL) {
 519                 pdata = devm_kzalloc(pchip->dev,
 520                                      sizeof(struct lm3630a_platform_data),
 521                                      GFP_KERNEL);
 522                 if (pdata == NULL)
 523                         return -ENOMEM;
 524
 525                 /* default values */
 526                 pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
 527                 pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
 528                 pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
 529                 pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
 530
 531                 rval = lm3630a_parse_node(pchip, pdata);
 532                 if (rval) {
 533                         dev_err(&client->dev, "fail : parse node\n");
 534                         return rval;
 535                 }
 536         }
 537         pchip->pdata = pdata;
 538
 539         pchip->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
 540                                                 GPIOD_OUT_HIGH);
 541         if (IS_ERR(pchip->enable_gpio)) {
 542                 rval = PTR_ERR(pchip->enable_gpio);
 543                 return rval;
 544         }
 545
 546         /* chip initialize */
 547         rval = lm3630a_chip_init(pchip);
 548         if (rval < 0) {
 549                 dev_err(&client->dev, "fail : init chip\n");
 550                 return rval;
 551         }
 552         /* backlight register */
 553         rval = lm3630a_backlight_register(pchip);
 554         if (rval < 0) {
 555                 dev_err(&client->dev, "fail : backlight register.\n");
 556                 return rval;
 557         }
 558         /* pwm */
 559         if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
 560                 pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
 561                 if (IS_ERR(pchip->pwmd)) {
 562                         dev_err(&client->dev, "fail : get pwm device\n");
 563                         return PTR_ERR(pchip->pwmd);
 564                 }
 565
 566                 /*
 567                  * FIXME: pwm_apply_args() should be removed when switching to
 568                  * the atomic PWM API.
 569                  */
 570                 pwm_apply_args(pchip->pwmd);
 571         }
 572
 573         /* interrupt enable  : irq 0 is not allowed */
 574         pchip->irq = client->irq;
 575         if (pchip->irq) {
 576                 rval = lm3630a_intr_config(pchip);
 577                 if (rval < 0)
 578                         return rval;
 579         }
 580         dev_info(&client->dev, "LM3630A backlight register OK.\n");
 581         return 0;
 582 }
 583
 584 static int lm3630a_remove(struct i2c_client *client)
 585 {
 586         int rval;
 587         struct lm3630a_chip *pchip = i2c_get_clientdata(client);
 588
 589         rval = lm3630a_write(pchip, REG_BRT_A, 0);
 590         if (rval < 0)
 591                 dev_err(pchip->dev, "i2c failed to access register\n");
 592
 593         rval = lm3630a_write(pchip, REG_BRT_B, 0);
 594         if (rval < 0)
 595                 dev_err(pchip->dev, "i2c failed to access register\n");
 596
 597         if (pchip->irq) {
 598                 free_irq(pchip->irq, pchip);
 599                 flush_workqueue(pchip->irqthread);
 600                 destroy_workqueue(pchip->irqthread);
 601         }
 602         return 0;
 603 }
 604
 605 static const struct i2c_device_id lm3630a_id[] = {
 606         {LM3630A_NAME, 0},
 607         {}
 608 };
 609
 610 MODULE_DEVICE_TABLE(i2c, lm3630a_id);
 611
 612 static const struct of_device_id lm3630a_match_table[] = {
 613         { .compatible = "ti,lm3630a", },
 614         { },
 615 };
 616
 617 MODULE_DEVICE_TABLE(of, lm3630a_match_table);
 618
 619 static struct i2c_driver lm3630a_i2c_driver = {
 620         .driver = {
 621                    .name = LM3630A_NAME,
 622                    .of_match_table = lm3630a_match_table,
 623                    },
 624         .probe = lm3630a_probe,
 625         .remove = lm3630a_remove,
 626         .id_table = lm3630a_id,
 627 };
 628
 629 module_i2c_driver(lm3630a_i2c_driver);
 630
 631 MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
 632 MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
 633 MODULE_AUTHOR("LDD MLP <ldd-mlp@list.ti.com>");
 634 MODULE_LICENSE("GPL v2");