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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * IIO driver for the light sensor ISL29028.
0004  * ISL29028 is Concurrent Ambient Light and Proximity Sensor
0005  *
0006  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
0007  * Copyright (c) 2016-2017 Brian Masney <masneyb@onstation.org>
0008  *
0009  * Datasheets:
0010  *  - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29028.pdf
0011  *  - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29030.pdf
0012  */
0013 
0014 #include <linux/module.h>
0015 #include <linux/i2c.h>
0016 #include <linux/err.h>
0017 #include <linux/mutex.h>
0018 #include <linux/delay.h>
0019 #include <linux/slab.h>
0020 #include <linux/regmap.h>
0021 #include <linux/iio/iio.h>
0022 #include <linux/iio/sysfs.h>
0023 #include <linux/pm_runtime.h>
0024 
0025 #define ISL29028_CONV_TIME_MS           100
0026 
0027 #define ISL29028_REG_CONFIGURE          0x01
0028 
0029 #define ISL29028_CONF_ALS_IR_MODE_ALS       0
0030 #define ISL29028_CONF_ALS_IR_MODE_IR        BIT(0)
0031 #define ISL29028_CONF_ALS_IR_MODE_MASK      BIT(0)
0032 
0033 #define ISL29028_CONF_ALS_RANGE_LOW_LUX     0
0034 #define ISL29028_CONF_ALS_RANGE_HIGH_LUX    BIT(1)
0035 #define ISL29028_CONF_ALS_RANGE_MASK        BIT(1)
0036 
0037 #define ISL29028_CONF_ALS_DIS           0
0038 #define ISL29028_CONF_ALS_EN            BIT(2)
0039 #define ISL29028_CONF_ALS_EN_MASK       BIT(2)
0040 
0041 #define ISL29028_CONF_PROX_SLP_SH       4
0042 #define ISL29028_CONF_PROX_SLP_MASK     (7 << ISL29028_CONF_PROX_SLP_SH)
0043 
0044 #define ISL29028_CONF_PROX_EN           BIT(7)
0045 #define ISL29028_CONF_PROX_EN_MASK      BIT(7)
0046 
0047 #define ISL29028_REG_INTERRUPT          0x02
0048 
0049 #define ISL29028_REG_PROX_DATA          0x08
0050 #define ISL29028_REG_ALSIR_L            0x09
0051 #define ISL29028_REG_ALSIR_U            0x0A
0052 
0053 #define ISL29028_REG_TEST1_MODE         0x0E
0054 #define ISL29028_REG_TEST2_MODE         0x0F
0055 
0056 #define ISL29028_NUM_REGS           (ISL29028_REG_TEST2_MODE + 1)
0057 
0058 #define ISL29028_POWER_OFF_DELAY_MS     2000
0059 
0060 struct isl29028_prox_data {
0061     int sampling_int;
0062     int sampling_fract;
0063     int sleep_time;
0064 };
0065 
0066 static const struct isl29028_prox_data isl29028_prox_data[] = {
0067     {   1, 250000, 800 },
0068     {   2, 500000, 400 },
0069     {   5,      0, 200 },
0070     {  10,      0, 100 },
0071     {  13, 300000,  75 },
0072     {  20,      0,  50 },
0073     {  80,      0,  13 }, /*
0074                    * Note: Data sheet lists 12.5 ms sleep time.
0075                    * Round up a half millisecond for msleep().
0076                    */
0077     { 100,  0,   0 }
0078 };
0079 
0080 enum isl29028_als_ir_mode {
0081     ISL29028_MODE_NONE = 0,
0082     ISL29028_MODE_ALS,
0083     ISL29028_MODE_IR,
0084 };
0085 
0086 struct isl29028_chip {
0087     struct mutex            lock;
0088     struct regmap           *regmap;
0089     int             prox_sampling_int;
0090     int             prox_sampling_frac;
0091     bool                enable_prox;
0092     int             lux_scale;
0093     enum isl29028_als_ir_mode   als_ir_mode;
0094 };
0095 
0096 static int isl29028_find_prox_sleep_index(int sampling_int, int sampling_fract)
0097 {
0098     int i;
0099 
0100     for (i = 0; i < ARRAY_SIZE(isl29028_prox_data); ++i) {
0101         if (isl29028_prox_data[i].sampling_int == sampling_int &&
0102             isl29028_prox_data[i].sampling_fract == sampling_fract)
0103             return i;
0104     }
0105 
0106     return -EINVAL;
0107 }
0108 
0109 static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
0110                     int sampling_int, int sampling_fract)
0111 {
0112     struct device *dev = regmap_get_device(chip->regmap);
0113     int sleep_index, ret;
0114 
0115     sleep_index = isl29028_find_prox_sleep_index(sampling_int,
0116                              sampling_fract);
0117     if (sleep_index < 0)
0118         return sleep_index;
0119 
0120     ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
0121                  ISL29028_CONF_PROX_SLP_MASK,
0122                  sleep_index << ISL29028_CONF_PROX_SLP_SH);
0123 
0124     if (ret < 0) {
0125         dev_err(dev, "%s(): Error %d setting the proximity sampling\n",
0126             __func__, ret);
0127         return ret;
0128     }
0129 
0130     chip->prox_sampling_int = sampling_int;
0131     chip->prox_sampling_frac = sampling_fract;
0132 
0133     return ret;
0134 }
0135 
0136 static int isl29028_enable_proximity(struct isl29028_chip *chip)
0137 {
0138     int prox_index, ret;
0139 
0140     ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling_int,
0141                        chip->prox_sampling_frac);
0142     if (ret < 0)
0143         return ret;
0144 
0145     ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
0146                  ISL29028_CONF_PROX_EN_MASK,
0147                  ISL29028_CONF_PROX_EN);
0148     if (ret < 0)
0149         return ret;
0150 
0151     /* Wait for conversion to be complete for first sample */
0152     prox_index = isl29028_find_prox_sleep_index(chip->prox_sampling_int,
0153                             chip->prox_sampling_frac);
0154     if (prox_index < 0)
0155         return prox_index;
0156 
0157     msleep(isl29028_prox_data[prox_index].sleep_time);
0158 
0159     return 0;
0160 }
0161 
0162 static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
0163 {
0164     struct device *dev = regmap_get_device(chip->regmap);
0165     int val = (lux_scale == 2000) ? ISL29028_CONF_ALS_RANGE_HIGH_LUX :
0166                     ISL29028_CONF_ALS_RANGE_LOW_LUX;
0167     int ret;
0168 
0169     ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
0170                  ISL29028_CONF_ALS_RANGE_MASK, val);
0171     if (ret < 0) {
0172         dev_err(dev, "%s(): Error %d setting the ALS scale\n", __func__,
0173             ret);
0174         return ret;
0175     }
0176 
0177     chip->lux_scale = lux_scale;
0178 
0179     return ret;
0180 }
0181 
0182 static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
0183                     enum isl29028_als_ir_mode mode)
0184 {
0185     int ret;
0186 
0187     if (chip->als_ir_mode == mode)
0188         return 0;
0189 
0190     ret = isl29028_set_als_scale(chip, chip->lux_scale);
0191     if (ret < 0)
0192         return ret;
0193 
0194     switch (mode) {
0195     case ISL29028_MODE_ALS:
0196         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
0197                      ISL29028_CONF_ALS_IR_MODE_MASK,
0198                      ISL29028_CONF_ALS_IR_MODE_ALS);
0199         if (ret < 0)
0200             return ret;
0201 
0202         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
0203                      ISL29028_CONF_ALS_RANGE_MASK,
0204                      ISL29028_CONF_ALS_RANGE_HIGH_LUX);
0205         break;
0206     case ISL29028_MODE_IR:
0207         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
0208                      ISL29028_CONF_ALS_IR_MODE_MASK,
0209                      ISL29028_CONF_ALS_IR_MODE_IR);
0210         break;
0211     case ISL29028_MODE_NONE:
0212         return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
0213                       ISL29028_CONF_ALS_EN_MASK,
0214                       ISL29028_CONF_ALS_DIS);
0215     }
0216 
0217     if (ret < 0)
0218         return ret;
0219 
0220     /* Enable the ALS/IR */
0221     ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
0222                  ISL29028_CONF_ALS_EN_MASK,
0223                  ISL29028_CONF_ALS_EN);
0224     if (ret < 0)
0225         return ret;
0226 
0227     /* Need to wait for conversion time if ALS/IR mode enabled */
0228     msleep(ISL29028_CONV_TIME_MS);
0229 
0230     chip->als_ir_mode = mode;
0231 
0232     return 0;
0233 }
0234 
0235 static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
0236 {
0237     struct device *dev = regmap_get_device(chip->regmap);
0238     unsigned int lsb;
0239     unsigned int msb;
0240     int ret;
0241 
0242     ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
0243     if (ret < 0) {
0244         dev_err(dev,
0245             "%s(): Error %d reading register ALSIR_L\n",
0246             __func__, ret);
0247         return ret;
0248     }
0249 
0250     ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
0251     if (ret < 0) {
0252         dev_err(dev,
0253             "%s(): Error %d reading register ALSIR_U\n",
0254             __func__, ret);
0255         return ret;
0256     }
0257 
0258     *als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
0259 
0260     return 0;
0261 }
0262 
0263 static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
0264 {
0265     struct device *dev = regmap_get_device(chip->regmap);
0266     unsigned int data;
0267     int ret;
0268 
0269     if (!chip->enable_prox) {
0270         ret = isl29028_enable_proximity(chip);
0271         if (ret < 0)
0272             return ret;
0273 
0274         chip->enable_prox = true;
0275     }
0276 
0277     ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
0278     if (ret < 0) {
0279         dev_err(dev, "%s(): Error %d reading register PROX_DATA\n",
0280             __func__, ret);
0281         return ret;
0282     }
0283 
0284     *prox = data;
0285 
0286     return 0;
0287 }
0288 
0289 static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
0290 {
0291     struct device *dev = regmap_get_device(chip->regmap);
0292     int ret;
0293     int als_ir_data;
0294 
0295     ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_ALS);
0296     if (ret < 0) {
0297         dev_err(dev, "%s(): Error %d enabling ALS mode\n", __func__,
0298             ret);
0299         return ret;
0300     }
0301 
0302     ret = isl29028_read_als_ir(chip, &als_ir_data);
0303     if (ret < 0)
0304         return ret;
0305 
0306     /*
0307      * convert als data count to lux.
0308      * if lux_scale = 125,  lux = count * 0.031
0309      * if lux_scale = 2000, lux = count * 0.49
0310      */
0311     if (chip->lux_scale == 125)
0312         als_ir_data = (als_ir_data * 31) / 1000;
0313     else
0314         als_ir_data = (als_ir_data * 49) / 100;
0315 
0316     *als_data = als_ir_data;
0317 
0318     return 0;
0319 }
0320 
0321 static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
0322 {
0323     struct device *dev = regmap_get_device(chip->regmap);
0324     int ret;
0325 
0326     ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_IR);
0327     if (ret < 0) {
0328         dev_err(dev, "%s(): Error %d enabling IR mode\n", __func__,
0329             ret);
0330         return ret;
0331     }
0332 
0333     return isl29028_read_als_ir(chip, ir_data);
0334 }
0335 
0336 static int isl29028_set_pm_runtime_busy(struct isl29028_chip *chip, bool on)
0337 {
0338     struct device *dev = regmap_get_device(chip->regmap);
0339     int ret;
0340 
0341     if (on) {
0342         ret = pm_runtime_resume_and_get(dev);
0343     } else {
0344         pm_runtime_mark_last_busy(dev);
0345         ret = pm_runtime_put_autosuspend(dev);
0346     }
0347 
0348     return ret;
0349 }
0350 
0351 /* Channel IO */
0352 static int isl29028_write_raw(struct iio_dev *indio_dev,
0353                   struct iio_chan_spec const *chan,
0354                   int val, int val2, long mask)
0355 {
0356     struct isl29028_chip *chip = iio_priv(indio_dev);
0357     struct device *dev = regmap_get_device(chip->regmap);
0358     int ret;
0359 
0360     ret = isl29028_set_pm_runtime_busy(chip, true);
0361     if (ret < 0)
0362         return ret;
0363 
0364     mutex_lock(&chip->lock);
0365 
0366     ret = -EINVAL;
0367     switch (chan->type) {
0368     case IIO_PROXIMITY:
0369         if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
0370             dev_err(dev,
0371                 "%s(): proximity: Mask value 0x%08lx is not supported\n",
0372                 __func__, mask);
0373             break;
0374         }
0375 
0376         if (val < 1 || val > 100) {
0377             dev_err(dev,
0378                 "%s(): proximity: Sampling frequency %d is not in the range [1:100]\n",
0379                 __func__, val);
0380             break;
0381         }
0382 
0383         ret = isl29028_set_proxim_sampling(chip, val, val2);
0384         break;
0385     case IIO_LIGHT:
0386         if (mask != IIO_CHAN_INFO_SCALE) {
0387             dev_err(dev,
0388                 "%s(): light: Mask value 0x%08lx is not supported\n",
0389                 __func__, mask);
0390             break;
0391         }
0392 
0393         if (val != 125 && val != 2000) {
0394             dev_err(dev,
0395                 "%s(): light: Lux scale %d is not in the set {125, 2000}\n",
0396                 __func__, val);
0397             break;
0398         }
0399 
0400         ret = isl29028_set_als_scale(chip, val);
0401         break;
0402     default:
0403         dev_err(dev, "%s(): Unsupported channel type %x\n",
0404             __func__, chan->type);
0405         break;
0406     }
0407 
0408     mutex_unlock(&chip->lock);
0409 
0410     if (ret < 0)
0411         return ret;
0412 
0413     ret = isl29028_set_pm_runtime_busy(chip, false);
0414     if (ret < 0)
0415         return ret;
0416 
0417     return ret;
0418 }
0419 
0420 static int isl29028_read_raw(struct iio_dev *indio_dev,
0421                  struct iio_chan_spec const *chan,
0422                  int *val, int *val2, long mask)
0423 {
0424     struct isl29028_chip *chip = iio_priv(indio_dev);
0425     struct device *dev = regmap_get_device(chip->regmap);
0426     int ret, pm_ret;
0427 
0428     ret = isl29028_set_pm_runtime_busy(chip, true);
0429     if (ret < 0)
0430         return ret;
0431 
0432     mutex_lock(&chip->lock);
0433 
0434     ret = -EINVAL;
0435     switch (mask) {
0436     case IIO_CHAN_INFO_RAW:
0437     case IIO_CHAN_INFO_PROCESSED:
0438         switch (chan->type) {
0439         case IIO_LIGHT:
0440             ret = isl29028_als_get(chip, val);
0441             break;
0442         case IIO_INTENSITY:
0443             ret = isl29028_ir_get(chip, val);
0444             break;
0445         case IIO_PROXIMITY:
0446             ret = isl29028_read_proxim(chip, val);
0447             break;
0448         default:
0449             break;
0450         }
0451 
0452         if (ret < 0)
0453             break;
0454 
0455         ret = IIO_VAL_INT;
0456         break;
0457     case IIO_CHAN_INFO_SAMP_FREQ:
0458         if (chan->type != IIO_PROXIMITY)
0459             break;
0460 
0461         *val = chip->prox_sampling_int;
0462         *val2 = chip->prox_sampling_frac;
0463         ret = IIO_VAL_INT;
0464         break;
0465     case IIO_CHAN_INFO_SCALE:
0466         if (chan->type != IIO_LIGHT)
0467             break;
0468         *val = chip->lux_scale;
0469         ret = IIO_VAL_INT;
0470         break;
0471     default:
0472         dev_err(dev, "%s(): mask value 0x%08lx is not supported\n",
0473             __func__, mask);
0474         break;
0475     }
0476 
0477     mutex_unlock(&chip->lock);
0478 
0479     if (ret < 0)
0480         return ret;
0481 
0482     /**
0483      * Preserve the ret variable if the call to
0484      * isl29028_set_pm_runtime_busy() is successful so the reading
0485      * (if applicable) is returned to user space.
0486      */
0487     pm_ret = isl29028_set_pm_runtime_busy(chip, false);
0488     if (pm_ret < 0)
0489         return pm_ret;
0490 
0491     return ret;
0492 }
0493 
0494 static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
0495                 "1.25 2.5 5 10 13.3 20 80 100");
0496 static IIO_CONST_ATTR(in_illuminance_scale_available, "125 2000");
0497 
0498 #define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
0499 static struct attribute *isl29028_attributes[] = {
0500     ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
0501     ISL29028_CONST_ATTR(in_illuminance_scale_available),
0502     NULL,
0503 };
0504 
0505 static const struct attribute_group isl29108_group = {
0506     .attrs = isl29028_attributes,
0507 };
0508 
0509 static const struct iio_chan_spec isl29028_channels[] = {
0510     {
0511         .type = IIO_LIGHT,
0512         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
0513         BIT(IIO_CHAN_INFO_SCALE),
0514     }, {
0515         .type = IIO_INTENSITY,
0516         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
0517     }, {
0518         .type = IIO_PROXIMITY,
0519         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
0520         BIT(IIO_CHAN_INFO_SAMP_FREQ),
0521     }
0522 };
0523 
0524 static const struct iio_info isl29028_info = {
0525     .attrs = &isl29108_group,
0526     .read_raw = isl29028_read_raw,
0527     .write_raw = isl29028_write_raw,
0528 };
0529 
0530 static int isl29028_clear_configure_reg(struct isl29028_chip *chip)
0531 {
0532     struct device *dev = regmap_get_device(chip->regmap);
0533     int ret;
0534 
0535     ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
0536     if (ret < 0)
0537         dev_err(dev, "%s(): Error %d clearing the CONFIGURE register\n",
0538             __func__, ret);
0539 
0540     chip->als_ir_mode = ISL29028_MODE_NONE;
0541     chip->enable_prox = false;
0542 
0543     return ret;
0544 }
0545 
0546 static bool isl29028_is_volatile_reg(struct device *dev, unsigned int reg)
0547 {
0548     switch (reg) {
0549     case ISL29028_REG_INTERRUPT:
0550     case ISL29028_REG_PROX_DATA:
0551     case ISL29028_REG_ALSIR_L:
0552     case ISL29028_REG_ALSIR_U:
0553         return true;
0554     default:
0555         return false;
0556     }
0557 }
0558 
0559 static const struct regmap_config isl29028_regmap_config = {
0560     .reg_bits = 8,
0561     .val_bits = 8,
0562     .volatile_reg = isl29028_is_volatile_reg,
0563     .max_register = ISL29028_NUM_REGS - 1,
0564     .num_reg_defaults_raw = ISL29028_NUM_REGS,
0565     .cache_type = REGCACHE_RBTREE,
0566 };
0567 
0568 static int isl29028_probe(struct i2c_client *client,
0569               const struct i2c_device_id *id)
0570 {
0571     struct isl29028_chip *chip;
0572     struct iio_dev *indio_dev;
0573     int ret;
0574 
0575     indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
0576     if (!indio_dev)
0577         return -ENOMEM;
0578 
0579     chip = iio_priv(indio_dev);
0580 
0581     i2c_set_clientdata(client, indio_dev);
0582     mutex_init(&chip->lock);
0583 
0584     chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
0585     if (IS_ERR(chip->regmap)) {
0586         ret = PTR_ERR(chip->regmap);
0587         dev_err(&client->dev, "%s: Error %d initializing regmap\n",
0588             __func__, ret);
0589         return ret;
0590     }
0591 
0592     chip->enable_prox  = false;
0593     chip->prox_sampling_int = 20;
0594     chip->prox_sampling_frac = 0;
0595     chip->lux_scale = 2000;
0596 
0597     ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
0598     if (ret < 0) {
0599         dev_err(&client->dev,
0600             "%s(): Error %d writing to TEST1_MODE register\n",
0601             __func__, ret);
0602         return ret;
0603     }
0604 
0605     ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
0606     if (ret < 0) {
0607         dev_err(&client->dev,
0608             "%s(): Error %d writing to TEST2_MODE register\n",
0609             __func__, ret);
0610         return ret;
0611     }
0612 
0613     ret = isl29028_clear_configure_reg(chip);
0614     if (ret < 0)
0615         return ret;
0616 
0617     indio_dev->info = &isl29028_info;
0618     indio_dev->channels = isl29028_channels;
0619     indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
0620     indio_dev->name = id->name;
0621     indio_dev->modes = INDIO_DIRECT_MODE;
0622 
0623     pm_runtime_enable(&client->dev);
0624     pm_runtime_set_autosuspend_delay(&client->dev,
0625                      ISL29028_POWER_OFF_DELAY_MS);
0626     pm_runtime_use_autosuspend(&client->dev);
0627 
0628     ret = iio_device_register(indio_dev);
0629     if (ret < 0) {
0630         dev_err(&client->dev,
0631             "%s(): iio registration failed with error %d\n",
0632             __func__, ret);
0633         return ret;
0634     }
0635 
0636     return 0;
0637 }
0638 
0639 static int isl29028_remove(struct i2c_client *client)
0640 {
0641     struct iio_dev *indio_dev = i2c_get_clientdata(client);
0642     struct isl29028_chip *chip = iio_priv(indio_dev);
0643 
0644     iio_device_unregister(indio_dev);
0645 
0646     pm_runtime_disable(&client->dev);
0647     pm_runtime_set_suspended(&client->dev);
0648 
0649     isl29028_clear_configure_reg(chip);
0650 
0651     return 0;
0652 }
0653 
0654 static int isl29028_suspend(struct device *dev)
0655 {
0656     struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
0657     struct isl29028_chip *chip = iio_priv(indio_dev);
0658     int ret;
0659 
0660     mutex_lock(&chip->lock);
0661 
0662     ret = isl29028_clear_configure_reg(chip);
0663 
0664     mutex_unlock(&chip->lock);
0665 
0666     return ret;
0667 }
0668 
0669 static int isl29028_resume(struct device *dev)
0670 {
0671     /**
0672      * The specific component (ALS/IR or proximity) will enable itself as
0673      * needed the next time that the user requests a reading. This is done
0674      * above in isl29028_set_als_ir_mode() and isl29028_enable_proximity().
0675      */
0676     return 0;
0677 }
0678 
0679 static DEFINE_RUNTIME_DEV_PM_OPS(isl29028_pm_ops, isl29028_suspend,
0680                  isl29028_resume, NULL);
0681 
0682 static const struct i2c_device_id isl29028_id[] = {
0683     {"isl29028", 0},
0684     {"isl29030", 0},
0685     {}
0686 };
0687 MODULE_DEVICE_TABLE(i2c, isl29028_id);
0688 
0689 static const struct of_device_id isl29028_of_match[] = {
0690     { .compatible = "isl,isl29028", }, /* for backward compat., don't use */
0691     { .compatible = "isil,isl29028", },
0692     { .compatible = "isil,isl29030", },
0693     { },
0694 };
0695 MODULE_DEVICE_TABLE(of, isl29028_of_match);
0696 
0697 static struct i2c_driver isl29028_driver = {
0698     .driver  = {
0699         .name = "isl29028",
0700         .pm = pm_ptr(&isl29028_pm_ops),
0701         .of_match_table = isl29028_of_match,
0702     },
0703     .probe   = isl29028_probe,
0704     .remove  = isl29028_remove,
0705     .id_table = isl29028_id,
0706 };
0707 
0708 module_i2c_driver(isl29028_driver);
0709 
0710 MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
0711 MODULE_LICENSE("GPL v2");
0712 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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