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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003 * Simple driver for Texas Instruments LM3630A Backlight driver chip
0004 * Copyright (C) 2012 Texas Instruments
0005 */
0006 #include <linux/module.h>
0007 #include <linux/slab.h>
0008 #include <linux/i2c.h>
0009 #include <linux/backlight.h>
0010 #include <linux/err.h>
0011 #include <linux/delay.h>
0012 #include <linux/uaccess.h>
0013 #include <linux/interrupt.h>
0014 #include <linux/regmap.h>
0015 #include <linux/gpio/consumer.h>
0016 #include <linux/pwm.h>
0017 #include <linux/platform_data/lm3630a_bl.h>
0018 
0019 #define REG_CTRL    0x00
0020 #define REG_BOOST   0x02
0021 #define REG_CONFIG  0x01
0022 #define REG_BRT_A   0x03
0023 #define REG_BRT_B   0x04
0024 #define REG_I_A     0x05
0025 #define REG_I_B     0x06
0026 #define REG_INT_STATUS  0x09
0027 #define REG_INT_EN  0x0A
0028 #define REG_FAULT   0x0B
0029 #define REG_PWM_OUTLOW  0x12
0030 #define REG_PWM_OUTHIGH 0x13
0031 #define REG_FILTER_STRENGTH 0x50
0032 #define REG_MAX     0x50
0033 
0034 #define INT_DEBOUNCE_MSEC   10
0035 
0036 #define LM3630A_BANK_0      0
0037 #define LM3630A_BANK_1      1
0038 
0039 #define LM3630A_NUM_SINKS   2
0040 #define LM3630A_SINK_0      0
0041 #define LM3630A_SINK_1      1
0042 
0043 struct lm3630a_chip {
0044     struct device *dev;
0045     struct delayed_work work;
0046 
0047     int irq;
0048     struct workqueue_struct *irqthread;
0049     struct lm3630a_platform_data *pdata;
0050     struct backlight_device *bleda;
0051     struct backlight_device *bledb;
0052     struct gpio_desc *enable_gpio;
0053     struct regmap *regmap;
0054     struct pwm_device *pwmd;
0055     struct pwm_state pwmd_state;
0056 };
0057 
0058 /* i2c access */
0059 static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)
0060 {
0061     int rval;
0062     unsigned int reg_val;
0063 
0064     rval = regmap_read(pchip->regmap, reg, &reg_val);
0065     if (rval < 0)
0066         return rval;
0067     return reg_val & 0xFF;
0068 }
0069 
0070 static int lm3630a_write(struct lm3630a_chip *pchip,
0071              unsigned int reg, unsigned int data)
0072 {
0073     return regmap_write(pchip->regmap, reg, data);
0074 }
0075 
0076 static int lm3630a_update(struct lm3630a_chip *pchip,
0077               unsigned int reg, unsigned int mask,
0078               unsigned int data)
0079 {
0080     return regmap_update_bits(pchip->regmap, reg, mask, data);
0081 }
0082 
0083 /* initialize chip */
0084 static int lm3630a_chip_init(struct lm3630a_chip *pchip)
0085 {
0086     int rval;
0087     struct lm3630a_platform_data *pdata = pchip->pdata;
0088 
0089     usleep_range(1000, 2000);
0090     /* set Filter Strength Register */
0091     rval = lm3630a_write(pchip, REG_FILTER_STRENGTH, 0x03);
0092     /* set Cofig. register */
0093     rval |= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
0094     /* set boost control */
0095     rval |= lm3630a_write(pchip, REG_BOOST, 0x38);
0096     /* set current A */
0097     rval |= lm3630a_update(pchip, REG_I_A, 0x1F, 0x1F);
0098     /* set current B */
0099     rval |= lm3630a_write(pchip, REG_I_B, 0x1F);
0100     /* set control */
0101     rval |= lm3630a_update(pchip, REG_CTRL, 0x14, pdata->leda_ctrl);
0102     rval |= lm3630a_update(pchip, REG_CTRL, 0x0B, pdata->ledb_ctrl);
0103     usleep_range(1000, 2000);
0104     /* set brightness A and B */
0105     rval |= lm3630a_write(pchip, REG_BRT_A, pdata->leda_init_brt);
0106     rval |= lm3630a_write(pchip, REG_BRT_B, pdata->ledb_init_brt);
0107 
0108     if (rval < 0)
0109         dev_err(pchip->dev, "i2c failed to access register\n");
0110     return rval;
0111 }
0112 
0113 /* interrupt handling */
0114 static void lm3630a_delayed_func(struct work_struct *work)
0115 {
0116     int rval;
0117     struct lm3630a_chip *pchip;
0118 
0119     pchip = container_of(work, struct lm3630a_chip, work.work);
0120 
0121     rval = lm3630a_read(pchip, REG_INT_STATUS);
0122     if (rval < 0) {
0123         dev_err(pchip->dev,
0124             "i2c failed to access REG_INT_STATUS Register\n");
0125         return;
0126     }
0127 
0128     dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", rval);
0129 }
0130 
0131 static irqreturn_t lm3630a_isr_func(int irq, void *chip)
0132 {
0133     int rval;
0134     struct lm3630a_chip *pchip = chip;
0135     unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
0136 
0137     queue_delayed_work(pchip->irqthread, &pchip->work, delay);
0138 
0139     rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
0140     if (rval < 0) {
0141         dev_err(pchip->dev, "i2c failed to access register\n");
0142         return IRQ_NONE;
0143     }
0144     return IRQ_HANDLED;
0145 }
0146 
0147 static int lm3630a_intr_config(struct lm3630a_chip *pchip)
0148 {
0149     int rval;
0150 
0151     rval = lm3630a_write(pchip, REG_INT_EN, 0x87);
0152     if (rval < 0)
0153         return rval;
0154 
0155     INIT_DELAYED_WORK(&pchip->work, lm3630a_delayed_func);
0156     pchip->irqthread = create_singlethread_workqueue("lm3630a-irqthd");
0157     if (!pchip->irqthread) {
0158         dev_err(pchip->dev, "create irq thread fail\n");
0159         return -ENOMEM;
0160     }
0161     if (request_threaded_irq
0162         (pchip->irq, NULL, lm3630a_isr_func,
0163          IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630a_irq", pchip)) {
0164         dev_err(pchip->dev, "request threaded irq fail\n");
0165         destroy_workqueue(pchip->irqthread);
0166         return -ENOMEM;
0167     }
0168     return rval;
0169 }
0170 
0171 static int lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
0172 {
0173     int err;
0174 
0175     pchip->pwmd_state.period = pchip->pdata->pwm_period;
0176 
0177     err = pwm_set_relative_duty_cycle(&pchip->pwmd_state, br, br_max);
0178     if (err)
0179         return err;
0180 
0181     pchip->pwmd_state.enabled = pchip->pwmd_state.duty_cycle ? true : false;
0182 
0183     return pwm_apply_state(pchip->pwmd, &pchip->pwmd_state);
0184 }
0185 
0186 /* update and get brightness */
0187 static int lm3630a_bank_a_update_status(struct backlight_device *bl)
0188 {
0189     int ret;
0190     struct lm3630a_chip *pchip = bl_get_data(bl);
0191     enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
0192 
0193     /* pwm control */
0194     if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0)
0195         return lm3630a_pwm_ctrl(pchip, bl->props.brightness,
0196                     bl->props.max_brightness);
0197 
0198     /* disable sleep */
0199     ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
0200     if (ret < 0)
0201         goto out_i2c_err;
0202     usleep_range(1000, 2000);
0203     /* minimum brightness is 0x04 */
0204     ret = lm3630a_write(pchip, REG_BRT_A, bl->props.brightness);
0205     if (bl->props.brightness < 0x4)
0206         ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDA_ENABLE, 0);
0207     else
0208         ret |= lm3630a_update(pchip, REG_CTRL,
0209                       LM3630A_LEDA_ENABLE, LM3630A_LEDA_ENABLE);
0210     if (ret < 0)
0211         goto out_i2c_err;
0212     return 0;
0213 
0214 out_i2c_err:
0215     dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
0216     return ret;
0217 }
0218 
0219 static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
0220 {
0221     int brightness, rval;
0222     struct lm3630a_chip *pchip = bl_get_data(bl);
0223     enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
0224 
0225     if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
0226         rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
0227         if (rval < 0)
0228             goto out_i2c_err;
0229         brightness = (rval & 0x01) << 8;
0230         rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
0231         if (rval < 0)
0232             goto out_i2c_err;
0233         brightness |= rval;
0234         goto out;
0235     }
0236 
0237     /* disable sleep */
0238     rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
0239     if (rval < 0)
0240         goto out_i2c_err;
0241     usleep_range(1000, 2000);
0242     rval = lm3630a_read(pchip, REG_BRT_A);
0243     if (rval < 0)
0244         goto out_i2c_err;
0245     brightness = rval;
0246 
0247 out:
0248     bl->props.brightness = brightness;
0249     return bl->props.brightness;
0250 out_i2c_err:
0251     dev_err(pchip->dev, "i2c failed to access register\n");
0252     return 0;
0253 }
0254 
0255 static const struct backlight_ops lm3630a_bank_a_ops = {
0256     .options = BL_CORE_SUSPENDRESUME,
0257     .update_status = lm3630a_bank_a_update_status,
0258     .get_brightness = lm3630a_bank_a_get_brightness,
0259 };
0260 
0261 /* update and get brightness */
0262 static int lm3630a_bank_b_update_status(struct backlight_device *bl)
0263 {
0264     int ret;
0265     struct lm3630a_chip *pchip = bl_get_data(bl);
0266     enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
0267 
0268     /* pwm control */
0269     if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0)
0270         return lm3630a_pwm_ctrl(pchip, bl->props.brightness,
0271                     bl->props.max_brightness);
0272 
0273     /* disable sleep */
0274     ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
0275     if (ret < 0)
0276         goto out_i2c_err;
0277     usleep_range(1000, 2000);
0278     /* minimum brightness is 0x04 */
0279     ret = lm3630a_write(pchip, REG_BRT_B, bl->props.brightness);
0280     if (bl->props.brightness < 0x4)
0281         ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
0282     else
0283         ret |= lm3630a_update(pchip, REG_CTRL,
0284                       LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
0285     if (ret < 0)
0286         goto out_i2c_err;
0287     return 0;
0288 
0289 out_i2c_err:
0290     dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
0291     return ret;
0292 }
0293 
0294 static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
0295 {
0296     int brightness, rval;
0297     struct lm3630a_chip *pchip = bl_get_data(bl);
0298     enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
0299 
0300     if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
0301         rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
0302         if (rval < 0)
0303             goto out_i2c_err;
0304         brightness = (rval & 0x01) << 8;
0305         rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
0306         if (rval < 0)
0307             goto out_i2c_err;
0308         brightness |= rval;
0309         goto out;
0310     }
0311 
0312     /* disable sleep */
0313     rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
0314     if (rval < 0)
0315         goto out_i2c_err;
0316     usleep_range(1000, 2000);
0317     rval = lm3630a_read(pchip, REG_BRT_B);
0318     if (rval < 0)
0319         goto out_i2c_err;
0320     brightness = rval;
0321 
0322 out:
0323     bl->props.brightness = brightness;
0324     return bl->props.brightness;
0325 out_i2c_err:
0326     dev_err(pchip->dev, "i2c failed to access register\n");
0327     return 0;
0328 }
0329 
0330 static const struct backlight_ops lm3630a_bank_b_ops = {
0331     .options = BL_CORE_SUSPENDRESUME,
0332     .update_status = lm3630a_bank_b_update_status,
0333     .get_brightness = lm3630a_bank_b_get_brightness,
0334 };
0335 
0336 static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
0337 {
0338     struct lm3630a_platform_data *pdata = pchip->pdata;
0339     struct backlight_properties props;
0340     const char *label;
0341 
0342     props.type = BACKLIGHT_RAW;
0343     if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
0344         props.brightness = pdata->leda_init_brt;
0345         props.max_brightness = pdata->leda_max_brt;
0346         label = pdata->leda_label ? pdata->leda_label : "lm3630a_leda";
0347         pchip->bleda =
0348             devm_backlight_device_register(pchip->dev, label,
0349                            pchip->dev, pchip,
0350                            &lm3630a_bank_a_ops, &props);
0351         if (IS_ERR(pchip->bleda))
0352             return PTR_ERR(pchip->bleda);
0353     }
0354 
0355     if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
0356         (pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
0357         props.brightness = pdata->ledb_init_brt;
0358         props.max_brightness = pdata->ledb_max_brt;
0359         label = pdata->ledb_label ? pdata->ledb_label : "lm3630a_ledb";
0360         pchip->bledb =
0361             devm_backlight_device_register(pchip->dev, label,
0362                            pchip->dev, pchip,
0363                            &lm3630a_bank_b_ops, &props);
0364         if (IS_ERR(pchip->bledb))
0365             return PTR_ERR(pchip->bledb);
0366     }
0367     return 0;
0368 }
0369 
0370 static const struct regmap_config lm3630a_regmap = {
0371     .reg_bits = 8,
0372     .val_bits = 8,
0373     .max_register = REG_MAX,
0374 };
0375 
0376 static int lm3630a_parse_led_sources(struct fwnode_handle *node,
0377                      int default_led_sources)
0378 {
0379     u32 sources[LM3630A_NUM_SINKS];
0380     int ret, num_sources, i;
0381 
0382     num_sources = fwnode_property_count_u32(node, "led-sources");
0383     if (num_sources < 0)
0384         return default_led_sources;
0385     else if (num_sources > ARRAY_SIZE(sources))
0386         return -EINVAL;
0387 
0388     ret = fwnode_property_read_u32_array(node, "led-sources", sources,
0389                          num_sources);
0390     if (ret)
0391         return ret;
0392 
0393     for (i = 0; i < num_sources; i++) {
0394         if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
0395             return -EINVAL;
0396 
0397         ret |= BIT(sources[i]);
0398     }
0399 
0400     return ret;
0401 }
0402 
0403 static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
0404                   struct fwnode_handle *node, int *seen_led_sources)
0405 {
0406     int led_sources, ret;
0407     const char *label;
0408     u32 bank, val;
0409     bool linear;
0410 
0411     ret = fwnode_property_read_u32(node, "reg", &bank);
0412     if (ret)
0413         return ret;
0414 
0415     if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
0416         return -EINVAL;
0417 
0418     led_sources = lm3630a_parse_led_sources(node, BIT(bank));
0419     if (led_sources < 0)
0420         return led_sources;
0421 
0422     if (*seen_led_sources & led_sources)
0423         return -EINVAL;
0424 
0425     *seen_led_sources |= led_sources;
0426 
0427     linear = fwnode_property_read_bool(node,
0428                        "ti,linear-mapping-mode");
0429     if (bank) {
0430         if (led_sources & BIT(LM3630A_SINK_0) ||
0431             !(led_sources & BIT(LM3630A_SINK_1)))
0432             return -EINVAL;
0433 
0434         pdata->ledb_ctrl = linear ?
0435             LM3630A_LEDB_ENABLE_LINEAR :
0436             LM3630A_LEDB_ENABLE;
0437     } else {
0438         if (!(led_sources & BIT(LM3630A_SINK_0)))
0439             return -EINVAL;
0440 
0441         pdata->leda_ctrl = linear ?
0442             LM3630A_LEDA_ENABLE_LINEAR :
0443             LM3630A_LEDA_ENABLE;
0444 
0445         if (led_sources & BIT(LM3630A_SINK_1))
0446             pdata->ledb_ctrl = LM3630A_LEDB_ON_A;
0447     }
0448 
0449     ret = fwnode_property_read_string(node, "label", &label);
0450     if (!ret) {
0451         if (bank)
0452             pdata->ledb_label = label;
0453         else
0454             pdata->leda_label = label;
0455     }
0456 
0457     ret = fwnode_property_read_u32(node, "default-brightness",
0458                        &val);
0459     if (!ret) {
0460         if (bank)
0461             pdata->ledb_init_brt = val;
0462         else
0463             pdata->leda_init_brt = val;
0464     }
0465 
0466     ret = fwnode_property_read_u32(node, "max-brightness", &val);
0467     if (!ret) {
0468         if (bank)
0469             pdata->ledb_max_brt = val;
0470         else
0471             pdata->leda_max_brt = val;
0472     }
0473 
0474     return 0;
0475 }
0476 
0477 static int lm3630a_parse_node(struct lm3630a_chip *pchip,
0478                   struct lm3630a_platform_data *pdata)
0479 {
0480     int ret = -ENODEV, seen_led_sources = 0;
0481     struct fwnode_handle *node;
0482 
0483     device_for_each_child_node(pchip->dev, node) {
0484         ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
0485         if (ret) {
0486             fwnode_handle_put(node);
0487             return ret;
0488         }
0489     }
0490 
0491     return ret;
0492 }
0493 
0494 static int lm3630a_probe(struct i2c_client *client,
0495              const struct i2c_device_id *id)
0496 {
0497     struct lm3630a_platform_data *pdata = dev_get_platdata(&client->dev);
0498     struct lm3630a_chip *pchip;
0499     int rval;
0500 
0501     if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
0502         dev_err(&client->dev, "fail : i2c functionality check\n");
0503         return -EOPNOTSUPP;
0504     }
0505 
0506     pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630a_chip),
0507                  GFP_KERNEL);
0508     if (!pchip)
0509         return -ENOMEM;
0510     pchip->dev = &client->dev;
0511 
0512     pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
0513     if (IS_ERR(pchip->regmap)) {
0514         rval = PTR_ERR(pchip->regmap);
0515         dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
0516         return rval;
0517     }
0518 
0519     i2c_set_clientdata(client, pchip);
0520     if (pdata == NULL) {
0521         pdata = devm_kzalloc(pchip->dev,
0522                      sizeof(struct lm3630a_platform_data),
0523                      GFP_KERNEL);
0524         if (pdata == NULL)
0525             return -ENOMEM;
0526 
0527         /* default values */
0528         pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
0529         pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
0530         pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
0531         pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
0532 
0533         rval = lm3630a_parse_node(pchip, pdata);
0534         if (rval) {
0535             dev_err(&client->dev, "fail : parse node\n");
0536             return rval;
0537         }
0538     }
0539     pchip->pdata = pdata;
0540 
0541     pchip->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
0542                         GPIOD_OUT_HIGH);
0543     if (IS_ERR(pchip->enable_gpio)) {
0544         rval = PTR_ERR(pchip->enable_gpio);
0545         return rval;
0546     }
0547 
0548     /* chip initialize */
0549     rval = lm3630a_chip_init(pchip);
0550     if (rval < 0) {
0551         dev_err(&client->dev, "fail : init chip\n");
0552         return rval;
0553     }
0554     /* backlight register */
0555     rval = lm3630a_backlight_register(pchip);
0556     if (rval < 0) {
0557         dev_err(&client->dev, "fail : backlight register.\n");
0558         return rval;
0559     }
0560     /* pwm */
0561     if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
0562         pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
0563         if (IS_ERR(pchip->pwmd)) {
0564             dev_err(&client->dev, "fail : get pwm device\n");
0565             return PTR_ERR(pchip->pwmd);
0566         }
0567 
0568         pwm_init_state(pchip->pwmd, &pchip->pwmd_state);
0569     }
0570 
0571     /* interrupt enable  : irq 0 is not allowed */
0572     pchip->irq = client->irq;
0573     if (pchip->irq) {
0574         rval = lm3630a_intr_config(pchip);
0575         if (rval < 0)
0576             return rval;
0577     }
0578     dev_info(&client->dev, "LM3630A backlight register OK.\n");
0579     return 0;
0580 }
0581 
0582 static int lm3630a_remove(struct i2c_client *client)
0583 {
0584     int rval;
0585     struct lm3630a_chip *pchip = i2c_get_clientdata(client);
0586 
0587     rval = lm3630a_write(pchip, REG_BRT_A, 0);
0588     if (rval < 0)
0589         dev_err(pchip->dev, "i2c failed to access register\n");
0590 
0591     rval = lm3630a_write(pchip, REG_BRT_B, 0);
0592     if (rval < 0)
0593         dev_err(pchip->dev, "i2c failed to access register\n");
0594 
0595     if (pchip->irq) {
0596         free_irq(pchip->irq, pchip);
0597         destroy_workqueue(pchip->irqthread);
0598     }
0599     return 0;
0600 }
0601 
0602 static const struct i2c_device_id lm3630a_id[] = {
0603     {LM3630A_NAME, 0},
0604     {}
0605 };
0606 
0607 MODULE_DEVICE_TABLE(i2c, lm3630a_id);
0608 
0609 static const struct of_device_id lm3630a_match_table[] = {
0610     { .compatible = "ti,lm3630a", },
0611     { },
0612 };
0613 
0614 MODULE_DEVICE_TABLE(of, lm3630a_match_table);
0615 
0616 static struct i2c_driver lm3630a_i2c_driver = {
0617     .driver = {
0618            .name = LM3630A_NAME,
0619            .of_match_table = lm3630a_match_table,
0620            },
0621     .probe = lm3630a_probe,
0622     .remove = lm3630a_remove,
0623     .id_table = lm3630a_id,
0624 };
0625 
0626 module_i2c_driver(lm3630a_i2c_driver);
0627 
0628 MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
0629 MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
0630 MODULE_AUTHOR("LDD MLP <ldd-mlp@list.ti.com>");
0631 MODULE_LICENSE("GPL v2");
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