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