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 0;
 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 (%pe)\n", ERR_PTR(ret));
 214         return ret;
 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                 return brightness;
 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         return rval;
 244
 245 out_i2c_err:
 246         dev_err(pchip->dev, "i2c failed to access register\n");
 247         return 0;
 248 }
 249
 250 static const struct backlight_ops lm3630a_bank_a_ops = {
 251         .options = BL_CORE_SUSPENDRESUME,
 252         .update_status = lm3630a_bank_a_update_status,
 253         .get_brightness = lm3630a_bank_a_get_brightness,
 254 };
 255
 256 /* update and get brightness */
 257 static int lm3630a_bank_b_update_status(struct backlight_device *bl)
 258 {
 259         int ret;
 260         struct lm3630a_chip *pchip = bl_get_data(bl);
 261         enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
 262
 263         /* pwm control */
 264         if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
 265                 lm3630a_pwm_ctrl(pchip, bl->props.brightness,
 266                                  bl->props.max_brightness);
 267                 return 0;
 268         }
 269
 270         /* disable sleep */
 271         ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
 272         if (ret < 0)
 273                 goto out_i2c_err;
 274         usleep_range(1000, 2000);
 275         /* minimum brightness is 0x04 */
 276         ret = lm3630a_write(pchip, REG_BRT_B, bl->props.brightness);
 277         if (bl->props.brightness < 0x4)
 278                 ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
 279         else
 280                 ret |= lm3630a_update(pchip, REG_CTRL,
 281                                       LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
 282         if (ret < 0)
 283                 goto out_i2c_err;
 284         return 0;
 285
 286 out_i2c_err:
 287         dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
 288         return ret;
 289 }
 290
 291 static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
 292 {
 293         int brightness, rval;
 294         struct lm3630a_chip *pchip = bl_get_data(bl);
 295         enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
 296
 297         if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
 298                 rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
 299                 if (rval < 0)
 300                         goto out_i2c_err;
 301                 brightness = (rval & 0x01) << 8;
 302                 rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
 303                 if (rval < 0)
 304                         goto out_i2c_err;
 305                 brightness |= rval;
 306                 return brightness;
 307         }
 308
 309         /* disable sleep */
 310         rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
 311         if (rval < 0)
 312                 goto out_i2c_err;
 313         usleep_range(1000, 2000);
 314         rval = lm3630a_read(pchip, REG_BRT_B);
 315         if (rval < 0)
 316                 goto out_i2c_err;
 317         return rval;
 318
 319 out_i2c_err:
 320         dev_err(pchip->dev, "i2c failed to access register\n");
 321         return 0;
 322 }
 323
 324 static const struct backlight_ops lm3630a_bank_b_ops = {
 325         .options = BL_CORE_SUSPENDRESUME,
 326         .update_status = lm3630a_bank_b_update_status,
 327         .get_brightness = lm3630a_bank_b_get_brightness,
 328 };
 329
 330 static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
 331 {
 332         struct lm3630a_platform_data *pdata = pchip->pdata;
 333         struct backlight_properties props;
 334         const char *label;
 335
 336         memset(&props, 0, sizeof(struct backlight_properties));
 337         props.type = BACKLIGHT_RAW;
 338         if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
 339                 props.brightness = pdata->leda_init_brt;
 340                 props.max_brightness = pdata->leda_max_brt;
 341                 label = pdata->leda_label ? pdata->leda_label : "lm3630a_leda";
 342                 pchip->bleda =
 343                     devm_backlight_device_register(pchip->dev, label,
 344                                                    pchip->dev, pchip,
 345                                                    &lm3630a_bank_a_ops, &props);
 346                 if (IS_ERR(pchip->bleda))
 347                         return PTR_ERR(pchip->bleda);
 348         }
 349
 350         if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
 351             (pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
 352                 props.brightness = pdata->ledb_init_brt;
 353                 props.max_brightness = pdata->ledb_max_brt;
 354                 label = pdata->ledb_label ? pdata->ledb_label : "lm3630a_ledb";
 355                 pchip->bledb =
 356                     devm_backlight_device_register(pchip->dev, label,
 357                                                    pchip->dev, pchip,
 358                                                    &lm3630a_bank_b_ops, &props);
 359                 if (IS_ERR(pchip->bledb))
 360                         return PTR_ERR(pchip->bledb);
 361         }
 362         return 0;
 363 }
 364
 365 static const struct regmap_config lm3630a_regmap = {
 366         .reg_bits = 8,
 367         .val_bits = 8,
 368         .max_register = REG_MAX,
 369 };
 370
 371 static int lm3630a_parse_led_sources(struct fwnode_handle *node,
 372                                      int default_led_sources)
 373 {
 374         u32 sources[LM3630A_NUM_SINKS];
 375         int ret, num_sources, i;
 376
 377         num_sources = fwnode_property_count_u32(node, "led-sources");
 378         if (num_sources < 0)
 379                 return default_led_sources;
 380         else if (num_sources > ARRAY_SIZE(sources))
 381                 return -EINVAL;
 382
 383         ret = fwnode_property_read_u32_array(node, "led-sources", sources,
 384                                              num_sources);
 385         if (ret)
 386                 return ret;
 387
 388         for (i = 0; i < num_sources; i++) {
 389                 if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
 390                         return -EINVAL;
 391
 392                 ret |= BIT(sources[i]);
 393         }
 394
 395         return ret;
 396 }
 397
 398 static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
 399                               struct fwnode_handle *node, int *seen_led_sources)
 400 {
 401         int led_sources, ret;
 402         const char *label;
 403         u32 bank, val;
 404         bool linear;
 405
 406         ret = fwnode_property_read_u32(node, "reg", &bank);
 407         if (ret)
 408                 return ret;
 409
 410         if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
 411                 return -EINVAL;
 412
 413         led_sources = lm3630a_parse_led_sources(node, BIT(bank));
 414         if (led_sources < 0)
 415                 return led_sources;
 416
 417         if (*seen_led_sources & led_sources)
 418                 return -EINVAL;
 419
 420         *seen_led_sources |= led_sources;
 421
 422         linear = fwnode_property_read_bool(node,
 423                                            "ti,linear-mapping-mode");
 424         if (bank) {
 425                 if (led_sources & BIT(LM3630A_SINK_0) ||
 426                     !(led_sources & BIT(LM3630A_SINK_1)))
 427                         return -EINVAL;
 428
 429                 pdata->ledb_ctrl = linear ?
 430                         LM3630A_LEDB_ENABLE_LINEAR :
 431                         LM3630A_LEDB_ENABLE;
 432         } else {
 433                 if (!(led_sources & BIT(LM3630A_SINK_0)))
 434                         return -EINVAL;
 435
 436                 pdata->leda_ctrl = linear ?
 437                         LM3630A_LEDA_ENABLE_LINEAR :
 438                         LM3630A_LEDA_ENABLE;
 439
 440                 if (led_sources & BIT(LM3630A_SINK_1))
 441                         pdata->ledb_ctrl = LM3630A_LEDB_ON_A;
 442         }
 443
 444         ret = fwnode_property_read_string(node, "label", &label);
 445         if (!ret) {
 446                 if (bank)
 447                         pdata->ledb_label = label;
 448                 else
 449                         pdata->leda_label = label;
 450         }
 451
 452         ret = fwnode_property_read_u32(node, "default-brightness",
 453                                        &val);
 454         if (!ret) {
 455                 if (bank)
 456                         pdata->ledb_init_brt = val;
 457                 else
 458                         pdata->leda_init_brt = val;
 459         }
 460
 461         ret = fwnode_property_read_u32(node, "max-brightness", &val);
 462         if (!ret) {
 463                 if (bank)
 464                         pdata->ledb_max_brt = val;
 465                 else
 466                         pdata->leda_max_brt = val;
 467         }
 468
 469         return 0;
 470 }
 471
 472 static int lm3630a_parse_node(struct lm3630a_chip *pchip,
 473                               struct lm3630a_platform_data *pdata)
 474 {
 475         int ret = -ENODEV, seen_led_sources = 0;
 476         struct fwnode_handle *node;
 477
 478         device_for_each_child_node(pchip->dev, node) {
 479                 ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
 480                 if (ret) {
 481                         fwnode_handle_put(node);
 482                         return ret;
 483                 }
 484         }
 485
 486         return ret;
 487 }
 488
 489 static int lm3630a_probe(struct i2c_client *client,
 490                          const struct i2c_device_id *id)
 491 {
 492         struct lm3630a_platform_data *pdata = dev_get_platdata(&client->dev);
 493         struct lm3630a_chip *pchip;
 494         int rval;
 495
 496         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 497                 dev_err(&client->dev, "fail : i2c functionality check\n");
 498                 return -EOPNOTSUPP;
 499         }
 500
 501         pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630a_chip),
 502                              GFP_KERNEL);
 503         if (!pchip)
 504                 return -ENOMEM;
 505         pchip->dev = &client->dev;
 506
 507         pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
 508         if (IS_ERR(pchip->regmap)) {
 509                 rval = PTR_ERR(pchip->regmap);
 510                 dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
 511                 return rval;
 512         }
 513
 514         i2c_set_clientdata(client, pchip);
 515         if (pdata == NULL) {
 516                 pdata = devm_kzalloc(pchip->dev,
 517                                      sizeof(struct lm3630a_platform_data),
 518                                      GFP_KERNEL);
 519                 if (pdata == NULL)
 520                         return -ENOMEM;
 521
 522                 /* default values */
 523                 pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
 524                 pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
 525                 pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
 526                 pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
 527
 528                 rval = lm3630a_parse_node(pchip, pdata);
 529                 if (rval) {
 530                         dev_err(&client->dev, "fail : parse node\n");
 531                         return rval;
 532                 }
 533         }
 534         pchip->pdata = pdata;
 535
 536         pchip->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
 537                                                 GPIOD_OUT_HIGH);
 538         if (IS_ERR(pchip->enable_gpio)) {
 539                 rval = PTR_ERR(pchip->enable_gpio);
 540                 return rval;
 541         }
 542
 543         /* chip initialize */
 544         rval = lm3630a_chip_init(pchip);
 545         if (rval < 0) {
 546                 dev_err(&client->dev, "fail : init chip\n");
 547                 return rval;
 548         }
 549         /* backlight register */
 550         rval = lm3630a_backlight_register(pchip);
 551         if (rval < 0) {
 552                 dev_err(&client->dev, "fail : backlight register.\n");
 553                 return rval;
 554         }
 555         /* pwm */
 556         if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
 557                 pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
 558                 if (IS_ERR(pchip->pwmd)) {
 559                         dev_err(&client->dev, "fail : get pwm device\n");
 560                         return PTR_ERR(pchip->pwmd);
 561                 }
 562
 563                 /*
 564                  * FIXME: pwm_apply_args() should be removed when switching to
 565                  * the atomic PWM API.
 566                  */
 567                 pwm_apply_args(pchip->pwmd);
 568         }
 569
 570         /* interrupt enable  : irq 0 is not allowed */
 571         pchip->irq = client->irq;
 572         if (pchip->irq) {
 573                 rval = lm3630a_intr_config(pchip);
 574                 if (rval < 0)
 575                         return rval;
 576         }
 577         dev_info(&client->dev, "LM3630A backlight register OK.\n");
 578         return 0;
 579 }
 580
 581 static int lm3630a_remove(struct i2c_client *client)
 582 {
 583         int rval;
 584         struct lm3630a_chip *pchip = i2c_get_clientdata(client);
 585
 586         rval = lm3630a_write(pchip, REG_BRT_A, 0);
 587         if (rval < 0)
 588                 dev_err(pchip->dev, "i2c failed to access register\n");
 589
 590         rval = lm3630a_write(pchip, REG_BRT_B, 0);
 591         if (rval < 0)
 592                 dev_err(pchip->dev, "i2c failed to access register\n");
 593
 594         if (pchip->irq) {
 595                 free_irq(pchip->irq, pchip);
 596                 flush_workqueue(pchip->irqthread);
 597                 destroy_workqueue(pchip->irqthread);
 598         }
 599         return 0;
 600 }
 601
 602 static const struct i2c_device_id lm3630a_id[] = {
 603         {LM3630A_NAME, 0},
 604         {}
 605 };
 606
 607 MODULE_DEVICE_TABLE(i2c, lm3630a_id);
 608
 609 static const struct of_device_id lm3630a_match_table[] = {
 610         { .compatible = "ti,lm3630a", },
 611         { },
 612 };
 613
 614 MODULE_DEVICE_TABLE(of, lm3630a_match_table);
 615
 616 static struct i2c_driver lm3630a_i2c_driver = {
 617         .driver = {
 618                    .name = LM3630A_NAME,
 619                    .of_match_table = lm3630a_match_table,
 620                    },
 621         .probe = lm3630a_probe,
 622         .remove = lm3630a_remove,
 623         .id_table = lm3630a_id,
 624 };
 625
 626 module_i2c_driver(lm3630a_i2c_driver);
 627
 628 MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
 629 MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
 630 MODULE_AUTHOR("LDD MLP <ldd-mlp@list.ti.com>");
 631 MODULE_LICENSE("GPL v2");