[deliverable/linux.git] / drivers / staging / iio / light / isl29028.c

/*
 * IIO driver for the light sensor ISL29028.
 * ISL29028 is Concurrent Ambient Light and Proximity Sensor
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#define ISL29028_CONV_TIME_MS		100

#define ISL29028_REG_CONFIGURE		0x01

#define ISL29028_CONF_ALS_IR_MODE_ALS	0
#define ISL29028_CONF_ALS_IR_MODE_IR	BIT(0)
#define ISL29028_CONF_ALS_IR_MODE_MASK	BIT(0)

#define ISL29028_CONF_ALS_RANGE_LOW_LUX	0
#define ISL29028_CONF_ALS_RANGE_HIGH_LUX	BIT(1)
#define ISL29028_CONF_ALS_RANGE_MASK	BIT(1)

#define ISL29028_CONF_ALS_DIS		0
#define ISL29028_CONF_ALS_EN		BIT(2)
#define ISL29028_CONF_ALS_EN_MASK	BIT(2)

#define ISL29028_CONF_PROX_SLP_SH	4
#define ISL29028_CONF_PROX_SLP_MASK	(7 << ISL29028_CONF_PROX_SLP_SH)

#define ISL29028_CONF_PROX_EN		BIT(7)
#define ISL29028_CONF_PROX_EN_MASK	BIT(7)

#define ISL29028_REG_INTERRUPT		0x02

#define ISL29028_REG_PROX_DATA		0x08
#define ISL29028_REG_ALSIR_L		0x09
#define ISL29028_REG_ALSIR_U		0x0A

#define ISL29028_REG_TEST1_MODE		0x0E
#define ISL29028_REG_TEST2_MODE		0x0F

#define ISL29028_NUM_REGS		(ISL29028_REG_TEST2_MODE + 1)

enum isl29028_als_ir_mode {
	ISL29028_MODE_NONE = 0,
	ISL29028_MODE_ALS,
	ISL29028_MODE_IR,
};

struct isl29028_chip {
	struct mutex		lock;
	struct regmap		*regmap;

	unsigned int		prox_sampling;
	bool			enable_prox;

	int			lux_scale;
	enum isl29028_als_ir_mode	als_ir_mode;
};

static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
					unsigned int sampling)
{
	static unsigned int prox_period[] = {800, 400, 200, 100, 75, 50, 12, 0};
	int sel;
	unsigned int period = DIV_ROUND_UP(1000, sampling);

	for (sel = 0; sel < ARRAY_SIZE(prox_period); ++sel) {
		if (period >= prox_period[sel])
			break;
	}
	return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
				  ISL29028_CONF_PROX_SLP_MASK,
				  sel << ISL29028_CONF_PROX_SLP_SH);
}

static int isl29028_enable_proximity(struct isl29028_chip *chip, bool enable)
{
	int ret;
	int val = 0;

	if (enable)
		val = ISL29028_CONF_PROX_EN;
	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
				 ISL29028_CONF_PROX_EN_MASK, val);
	if (ret < 0)
		return ret;

	/* Wait for conversion to be complete for first sample */
	mdelay(DIV_ROUND_UP(1000, chip->prox_sampling));
	return 0;
}

static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
{
	int val = (lux_scale == 2000) ? ISL29028_CONF_ALS_RANGE_HIGH_LUX :
					ISL29028_CONF_ALS_RANGE_LOW_LUX;

	return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
		ISL29028_CONF_ALS_RANGE_MASK, val);
}

static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
				    enum isl29028_als_ir_mode mode)
{
	int ret = 0;

	switch (mode) {
	case ISL29028_MODE_ALS:
		ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
					 ISL29028_CONF_ALS_IR_MODE_MASK,
					 ISL29028_CONF_ALS_IR_MODE_ALS);
		if (ret < 0)
			return ret;

		ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
					 ISL29028_CONF_ALS_RANGE_MASK,
					 ISL29028_CONF_ALS_RANGE_HIGH_LUX);
		break;

	case ISL29028_MODE_IR:
		ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
					 ISL29028_CONF_ALS_IR_MODE_MASK,
					 ISL29028_CONF_ALS_IR_MODE_IR);
		break;

	case ISL29028_MODE_NONE:
		return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
			ISL29028_CONF_ALS_EN_MASK, ISL29028_CONF_ALS_DIS);
	}

	if (ret < 0)
		return ret;

	/* Enable the ALS/IR */
	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
				 ISL29028_CONF_ALS_EN_MASK,
				 ISL29028_CONF_ALS_EN);
	if (ret < 0)
		return ret;

	/* Need to wait for conversion time if ALS/IR mode enabled */
	mdelay(ISL29028_CONV_TIME_MS);
	return 0;
}

static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
{
	struct device *dev = regmap_get_device(chip->regmap);
	unsigned int lsb;
	unsigned int msb;
	int ret;

	ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
	if (ret < 0) {
		dev_err(dev,
			"Error in reading register ALSIR_L err %d\n", ret);
		return ret;
	}

	ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
	if (ret < 0) {
		dev_err(dev,
			"Error in reading register ALSIR_U err %d\n", ret);
		return ret;
	}

	*als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
	return 0;
}

static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
{
	struct device *dev = regmap_get_device(chip->regmap);
	unsigned int data;
	int ret;

	ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
	if (ret < 0) {
		dev_err(dev, "Error in reading register %d, error %d\n",
			ISL29028_REG_PROX_DATA, ret);
		return ret;
	}
	*prox = data;
	return 0;
}

static int isl29028_proxim_get(struct isl29028_chip *chip, int *prox_data)
{
	int ret;

	if (!chip->enable_prox) {
		ret = isl29028_enable_proximity(chip, true);
		if (ret < 0)
			return ret;
		chip->enable_prox = true;
	}
	return isl29028_read_proxim(chip, prox_data);
}

static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
{
	struct device *dev = regmap_get_device(chip->regmap);
	int ret;
	int als_ir_data;

	if (chip->als_ir_mode != ISL29028_MODE_ALS) {
		ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_ALS);
		if (ret < 0) {
			dev_err(dev,
				"Error in enabling ALS mode err %d\n", ret);
			return ret;
		}
		chip->als_ir_mode = ISL29028_MODE_ALS;
	}

	ret = isl29028_read_als_ir(chip, &als_ir_data);
	if (ret < 0)
		return ret;

	/*
	 * convert als data count to lux.
	 * if lux_scale = 125,  lux = count * 0.031
	 * if lux_scale = 2000, lux = count * 0.49
	 */
	if (chip->lux_scale == 125)
		als_ir_data = (als_ir_data * 31) / 1000;
	else
		als_ir_data = (als_ir_data * 49) / 100;

	*als_data = als_ir_data;
	return 0;
}

static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
{
	struct device *dev = regmap_get_device(chip->regmap);
	int ret;

	if (chip->als_ir_mode != ISL29028_MODE_IR) {
		ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_IR);
		if (ret < 0) {
			dev_err(dev,
				"Error in enabling IR mode err %d\n", ret);
			return ret;
		}
		chip->als_ir_mode = ISL29028_MODE_IR;
	}
	return isl29028_read_als_ir(chip, ir_data);
}

/* Channel IO */
static int isl29028_write_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int val, int val2, long mask)
{
	struct isl29028_chip *chip = iio_priv(indio_dev);
	struct device *dev = regmap_get_device(chip->regmap);
	int ret = -EINVAL;

	mutex_lock(&chip->lock);
	switch (chan->type) {
	case IIO_PROXIMITY:
		if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
			dev_err(dev,
				"proximity: mask value 0x%08lx not supported\n",
				mask);
			break;
		}
		if (val < 1 || val > 100) {
			dev_err(dev,
				"Samp_freq %d is not in range[1:100]\n", val);
			break;
		}
		ret = isl29028_set_proxim_sampling(chip, val);
		if (ret < 0) {
			dev_err(dev,
				"Setting proximity samp_freq fail, err %d\n",
				ret);
			break;
		}
		chip->prox_sampling = val;
		break;

	case IIO_LIGHT:
		if (mask != IIO_CHAN_INFO_SCALE) {
			dev_err(dev,
				"light: mask value 0x%08lx not supported\n",
				mask);
			break;
		}
		if ((val != 125) && (val != 2000)) {
			dev_err(dev,
				"lux scale %d is invalid [125, 2000]\n", val);
			break;
		}
		ret = isl29028_set_als_scale(chip, val);
		if (ret < 0) {
			dev_err(dev,
				"Setting lux scale fail with error %d\n", ret);
			break;
		}
		chip->lux_scale = val;
		break;

	default:
		dev_err(dev, "Unsupported channel type\n");
		break;
	}
	mutex_unlock(&chip->lock);
	return ret;
}

static int isl29028_read_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int *val, int *val2, long mask)
{
	struct isl29028_chip *chip = iio_priv(indio_dev);
	struct device *dev = regmap_get_device(chip->regmap);
	int ret = -EINVAL;

	mutex_lock(&chip->lock);
	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	case IIO_CHAN_INFO_PROCESSED:
		switch (chan->type) {
		case IIO_LIGHT:
			ret = isl29028_als_get(chip, val);
			break;
		case IIO_INTENSITY:
			ret = isl29028_ir_get(chip, val);
			break;
		case IIO_PROXIMITY:
			ret = isl29028_proxim_get(chip, val);
			break;
		default:
			break;
		}
		if (ret < 0)
			break;
		ret = IIO_VAL_INT;
		break;

	case IIO_CHAN_INFO_SAMP_FREQ:
		if (chan->type != IIO_PROXIMITY)
			break;
		*val = chip->prox_sampling;
		ret = IIO_VAL_INT;
		break;

	case IIO_CHAN_INFO_SCALE:
		if (chan->type != IIO_LIGHT)
			break;
		*val = chip->lux_scale;
		ret = IIO_VAL_INT;
		break;

	default:
		dev_err(dev, "mask value 0x%08lx not supported\n", mask);
		break;
	}
	mutex_unlock(&chip->lock);
	return ret;
}

static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
				"1 3 5 10 13 20 83 100");
static IIO_CONST_ATTR(in_illuminance_scale_available, "125 2000");

#define ISL29028_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
#define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
static struct attribute *isl29028_attributes[] = {
	ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
	ISL29028_CONST_ATTR(in_illuminance_scale_available),
	NULL,
};

static const struct attribute_group isl29108_group = {
	.attrs = isl29028_attributes,
};

static const struct iio_chan_spec isl29028_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
		BIT(IIO_CHAN_INFO_SCALE),
	}, {
		.type = IIO_INTENSITY,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	}, {
		.type = IIO_PROXIMITY,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
		BIT(IIO_CHAN_INFO_SAMP_FREQ),
	}
};

static const struct iio_info isl29028_info = {
	.attrs = &isl29108_group,
	.driver_module = THIS_MODULE,
	.read_raw = isl29028_read_raw,
	.write_raw = isl29028_write_raw,
};

static int isl29028_chip_init(struct isl29028_chip *chip)
{
	struct device *dev = regmap_get_device(chip->regmap);
	int ret;

	chip->enable_prox  = false;
	chip->prox_sampling = 20;
	chip->lux_scale = 2000;
	chip->als_ir_mode = ISL29028_MODE_NONE;

	ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
	if (ret < 0) {
		dev_err(dev, "%s(): write to reg %d failed, err = %d\n",
			__func__, ISL29028_REG_TEST1_MODE, ret);
		return ret;
	}
	ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
	if (ret < 0) {
		dev_err(dev, "%s(): write to reg %d failed, err = %d\n",
			__func__, ISL29028_REG_TEST2_MODE, ret);
		return ret;
	}

	ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
	if (ret < 0) {
		dev_err(dev, "%s(): write to reg %d failed, err = %d\n",
			__func__, ISL29028_REG_CONFIGURE, ret);
		return ret;
	}

	ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling);
	if (ret < 0) {
		dev_err(dev, "setting the proximity, err = %d\n", ret);
		return ret;
	}

	ret = isl29028_set_als_scale(chip, chip->lux_scale);
	if (ret < 0)
		dev_err(dev, "setting als scale failed, err = %d\n", ret);
	return ret;
}

static bool isl29028_is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case ISL29028_REG_INTERRUPT:
	case ISL29028_REG_PROX_DATA:
	case ISL29028_REG_ALSIR_L:
	case ISL29028_REG_ALSIR_U:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config isl29028_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = isl29028_is_volatile_reg,
	.max_register = ISL29028_NUM_REGS - 1,
	.num_reg_defaults_raw = ISL29028_NUM_REGS,
	.cache_type = REGCACHE_RBTREE,
};

static int isl29028_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct isl29028_chip *chip;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
	if (!indio_dev) {
		dev_err(&client->dev, "iio allocation fails\n");
		return -ENOMEM;
	}

	chip = iio_priv(indio_dev);

	i2c_set_clientdata(client, indio_dev);
	mutex_init(&chip->lock);

	chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
	if (IS_ERR(chip->regmap)) {
		ret = PTR_ERR(chip->regmap);
		dev_err(&client->dev, "regmap initialization failed: %d\n",
			ret);
		return ret;
	}

	ret = isl29028_chip_init(chip);
	if (ret < 0) {
		dev_err(&client->dev, "chip initialization failed: %d\n", ret);
		return ret;
	}

	indio_dev->info = &isl29028_info;
	indio_dev->channels = isl29028_channels;
	indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
	indio_dev->name = id->name;
	indio_dev->dev.parent = &client->dev;
	indio_dev->modes = INDIO_DIRECT_MODE;
	ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
	if (ret < 0) {
		dev_err(&client->dev,
			"iio registration fails with error %d\n",
			ret);
		return ret;
	}
	return 0;
}

static const struct i2c_device_id isl29028_id[] = {
	{"isl29028", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, isl29028_id);

static const struct of_device_id isl29028_of_match[] = {
	{ .compatible = "isl,isl29028", }, /* for backward compat., don't use */
	{ .compatible = "isil,isl29028", },
	{ },
};
MODULE_DEVICE_TABLE(of, isl29028_of_match);

static struct i2c_driver isl29028_driver = {
	.driver  = {
		.name = "isl29028",
		.of_match_table = isl29028_of_match,
	},
	.probe	 = isl29028_probe,
	.id_table = isl29028_id,
};

module_i2c_driver(isl29028_driver);

MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
Commit	Line	Data
6d59ba2f LD	1	/*
	2	* IIO driver for the light sensor ISL29028.
	3	* ISL29028 is Concurrent Ambient Light and Proximity Sensor
	4	*
	5	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms and conditions of the GNU General Public License,
	9	* version 2, as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope it will be useful, but WITHOUT
	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	14	* more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/module.h>
	21	#include <linux/i2c.h>
	22	#include <linux/err.h>
	23	#include <linux/mutex.h>
	24	#include <linux/delay.h>
	25	#include <linux/slab.h>
	26	#include <linux/regmap.h>
06458e27 JC	27	#include <linux/iio/iio.h>
06458e27 JC	28	#include <linux/iio/sysfs.h>
6d59ba2f	29
3a37f1c2	30	#define ISL29028_CONV_TIME_MS 100
6d59ba2f LD	31
	32	#define ISL29028_REG_CONFIGURE 0x01
	33
3a37f1c2 PMS	34	#define ISL29028_CONF_ALS_IR_MODE_ALS 0
	35	#define ISL29028_CONF_ALS_IR_MODE_IR BIT(0)
	36	#define ISL29028_CONF_ALS_IR_MODE_MASK BIT(0)
6d59ba2f	37
3a37f1c2 PMS	38	#define ISL29028_CONF_ALS_RANGE_LOW_LUX 0
	39	#define ISL29028_CONF_ALS_RANGE_HIGH_LUX BIT(1)
	40	#define ISL29028_CONF_ALS_RANGE_MASK BIT(1)
6d59ba2f	41
3a37f1c2 PMS	42	#define ISL29028_CONF_ALS_DIS 0
	43	#define ISL29028_CONF_ALS_EN BIT(2)
	44	#define ISL29028_CONF_ALS_EN_MASK BIT(2)
6d59ba2f	45
3a37f1c2 PMS	46	#define ISL29028_CONF_PROX_SLP_SH 4
3a37f1c2 PMS	47	#define ISL29028_CONF_PROX_SLP_MASK (7 << ISL29028_CONF_PROX_SLP_SH)
6d59ba2f	48
3a37f1c2 PMS	49	#define ISL29028_CONF_PROX_EN BIT(7)
3a37f1c2 PMS	50	#define ISL29028_CONF_PROX_EN_MASK BIT(7)
6d59ba2f LD	51
	52	#define ISL29028_REG_INTERRUPT 0x02
	53
	54	#define ISL29028_REG_PROX_DATA 0x08
	55	#define ISL29028_REG_ALSIR_L 0x09
	56	#define ISL29028_REG_ALSIR_U 0x0A
	57
	58	#define ISL29028_REG_TEST1_MODE 0x0E
	59	#define ISL29028_REG_TEST2_MODE 0x0F
	60
	61	#define ISL29028_NUM_REGS (ISL29028_REG_TEST2_MODE + 1)
	62
bafaa6de PMS	63	enum isl29028_als_ir_mode {
	64	ISL29028_MODE_NONE = 0,
	65	ISL29028_MODE_ALS,
	66	ISL29028_MODE_IR,
6d59ba2f LD	67	};
	68
	69	struct isl29028_chip {
6d59ba2f LD	70	struct mutex lock;
	71	struct regmap *regmap;
	72
	73	unsigned int prox_sampling;
	74	bool enable_prox;
	75
	76	int lux_scale;
bafaa6de	77	enum isl29028_als_ir_mode als_ir_mode;
6d59ba2f LD	78	};
	79
	80	static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
ca52c88c	81	unsigned int sampling)
6d59ba2f LD	82	{
	83	static unsigned int prox_period[] = {800, 400, 200, 100, 75, 50, 12, 0};
	84	int sel;
	85	unsigned int period = DIV_ROUND_UP(1000, sampling);
	86
	87	for (sel = 0; sel < ARRAY_SIZE(prox_period); ++sel) {
	88	if (period >= prox_period[sel])
	89	break;
	90	}
	91	return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
3a37f1c2 PMS	92	ISL29028_CONF_PROX_SLP_MASK,
3a37f1c2 PMS	93	sel << ISL29028_CONF_PROX_SLP_SH);
6d59ba2f LD	94	}
	95
	96	static int isl29028_enable_proximity(struct isl29028_chip *chip, bool enable)
	97	{
	98	int ret;
	99	int val = 0;
	100
	101	if (enable)
3a37f1c2	102	val = ISL29028_CONF_PROX_EN;
6d59ba2f	103	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
3a37f1c2	104	ISL29028_CONF_PROX_EN_MASK, val);
6d59ba2f LD	105	if (ret < 0)
	106	return ret;
	107
	108	/* Wait for conversion to be complete for first sample */
	109	mdelay(DIV_ROUND_UP(1000, chip->prox_sampling));
	110	return 0;
	111	}
	112
	113	static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
	114	{
3a37f1c2 PMS	115	int val = (lux_scale == 2000) ? ISL29028_CONF_ALS_RANGE_HIGH_LUX :
3a37f1c2 PMS	116	ISL29028_CONF_ALS_RANGE_LOW_LUX;
6d59ba2f LD	117
6d59ba2f LD	118	return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
3a37f1c2	119	ISL29028_CONF_ALS_RANGE_MASK, val);
6d59ba2f LD	120	}
	121
	122	static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
bafaa6de	123	enum isl29028_als_ir_mode mode)
6d59ba2f LD	124	{
	125	int ret = 0;
	126
	127	switch (mode) {
bafaa6de	128	case ISL29028_MODE_ALS:
6d59ba2f	129	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
3a37f1c2 PMS	130	ISL29028_CONF_ALS_IR_MODE_MASK,
3a37f1c2 PMS	131	ISL29028_CONF_ALS_IR_MODE_ALS);
6d59ba2f LD	132	if (ret < 0)
	133	return ret;
	134
	135	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
3a37f1c2 PMS	136	ISL29028_CONF_ALS_RANGE_MASK,
3a37f1c2 PMS	137	ISL29028_CONF_ALS_RANGE_HIGH_LUX);
6d59ba2f LD	138	break;
6d59ba2f LD	139
bafaa6de	140	case ISL29028_MODE_IR:
6d59ba2f	141	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
3a37f1c2 PMS	142	ISL29028_CONF_ALS_IR_MODE_MASK,
3a37f1c2 PMS	143	ISL29028_CONF_ALS_IR_MODE_IR);
6d59ba2f LD	144	break;
6d59ba2f LD	145
bafaa6de	146	case ISL29028_MODE_NONE:
6d59ba2f	147	return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
3a37f1c2	148	ISL29028_CONF_ALS_EN_MASK, ISL29028_CONF_ALS_DIS);
6d59ba2f LD	149	}
	150
	151	if (ret < 0)
	152	return ret;
	153
	154	/* Enable the ALS/IR */
	155	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
3a37f1c2 PMS	156	ISL29028_CONF_ALS_EN_MASK,
3a37f1c2 PMS	157	ISL29028_CONF_ALS_EN);
6d59ba2f LD	158	if (ret < 0)
	159	return ret;
	160
	161	/* Need to wait for conversion time if ALS/IR mode enabled */
3a37f1c2	162	mdelay(ISL29028_CONV_TIME_MS);
6d59ba2f LD	163	return 0;
	164	}
	165
	166	static int isl29028_read_als_ir(struct isl29028_chip chip, int als_ir)
	167	{
722fc316	168	struct device *dev = regmap_get_device(chip->regmap);
6d59ba2f LD	169	unsigned int lsb;
	170	unsigned int msb;
	171	int ret;
	172
	173	ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
	174	if (ret < 0) {
722fc316	175	dev_err(dev,
6d59ba2f LD	176	"Error in reading register ALSIR_L err %d\n", ret);
	177	return ret;
	178	}
	179
	180	ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
	181	if (ret < 0) {
722fc316	182	dev_err(dev,
6d59ba2f LD	183	"Error in reading register ALSIR_U err %d\n", ret);
	184	return ret;
	185	}
	186
	187	*als_ir = ((msb & 0xF) << 8) \| (lsb & 0xFF);
	188	return 0;
	189	}
	190
	191	static int isl29028_read_proxim(struct isl29028_chip chip, int prox)
	192	{
722fc316	193	struct device *dev = regmap_get_device(chip->regmap);
6d59ba2f LD	194	unsigned int data;
	195	int ret;
	196
	197	ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
	198	if (ret < 0) {
722fc316	199	dev_err(dev, "Error in reading register %d, error %d\n",
ca52c88c	200	ISL29028_REG_PROX_DATA, ret);
6d59ba2f LD	201	return ret;
	202	}
	203	*prox = data;
	204	return 0;
	205	}
	206
	207	static int isl29028_proxim_get(struct isl29028_chip chip, int prox_data)
	208	{
	209	int ret;
	210
	211	if (!chip->enable_prox) {
	212	ret = isl29028_enable_proximity(chip, true);
	213	if (ret < 0)
	214	return ret;
	215	chip->enable_prox = true;
	216	}
	217	return isl29028_read_proxim(chip, prox_data);
	218	}
	219
	220	static int isl29028_als_get(struct isl29028_chip chip, int als_data)
	221	{
722fc316	222	struct device *dev = regmap_get_device(chip->regmap);
6d59ba2f LD	223	int ret;
	224	int als_ir_data;
	225
bafaa6de PMS	226	if (chip->als_ir_mode != ISL29028_MODE_ALS) {
bafaa6de PMS	227	ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_ALS);
6d59ba2f	228	if (ret < 0) {
722fc316	229	dev_err(dev,
6d59ba2f LD	230	"Error in enabling ALS mode err %d\n", ret);
	231	return ret;
	232	}
bafaa6de	233	chip->als_ir_mode = ISL29028_MODE_ALS;
6d59ba2f LD	234	}
	235
	236	ret = isl29028_read_als_ir(chip, &als_ir_data);
	237	if (ret < 0)
	238	return ret;
	239
	240	/*
	241	* convert als data count to lux.
	242	* if lux_scale = 125, lux = count * 0.031
	243	* if lux_scale = 2000, lux = count * 0.49
	244	*/
	245	if (chip->lux_scale == 125)
	246	als_ir_data = (als_ir_data * 31) / 1000;
	247	else
	248	als_ir_data = (als_ir_data * 49) / 100;
	249
	250	*als_data = als_ir_data;
	251	return 0;
	252	}
	253
	254	static int isl29028_ir_get(struct isl29028_chip chip, int ir_data)
	255	{
722fc316	256	struct device *dev = regmap_get_device(chip->regmap);
6d59ba2f LD	257	int ret;
6d59ba2f LD	258
bafaa6de PMS	259	if (chip->als_ir_mode != ISL29028_MODE_IR) {
bafaa6de PMS	260	ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_IR);
6d59ba2f	261	if (ret < 0) {
722fc316	262	dev_err(dev,
6d59ba2f LD	263	"Error in enabling IR mode err %d\n", ret);
	264	return ret;
	265	}
bafaa6de	266	chip->als_ir_mode = ISL29028_MODE_IR;
6d59ba2f LD	267	}
	268	return isl29028_read_als_ir(chip, ir_data);
	269	}
	270
	271	/* Channel IO */
	272	static int isl29028_write_raw(struct iio_dev *indio_dev,
ca52c88c ERR	273	struct iio_chan_spec const *chan,
ca52c88c ERR	274	int val, int val2, long mask)
6d59ba2f LD	275	{
6d59ba2f LD	276	struct isl29028_chip *chip = iio_priv(indio_dev);
722fc316	277	struct device *dev = regmap_get_device(chip->regmap);
6d59ba2f LD	278	int ret = -EINVAL;
	279
	280	mutex_lock(&chip->lock);
	281	switch (chan->type) {
	282	case IIO_PROXIMITY:
892cb6dc	283	if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
722fc316	284	dev_err(dev,
6d59ba2f LD	285	"proximity: mask value 0x%08lx not supported\n",
	286	mask);
	287	break;
	288	}
	289	if (val < 1 \|\| val > 100) {
722fc316	290	dev_err(dev,
6d59ba2f LD	291	"Samp_freq %d is not in range[1:100]\n", val);
	292	break;
	293	}
	294	ret = isl29028_set_proxim_sampling(chip, val);
	295	if (ret < 0) {
722fc316	296	dev_err(dev,
6d59ba2f LD	297	"Setting proximity samp_freq fail, err %d\n",
	298	ret);
	299	break;
	300	}
	301	chip->prox_sampling = val;
	302	break;
	303
	304	case IIO_LIGHT:
892cb6dc	305	if (mask != IIO_CHAN_INFO_SCALE) {
722fc316	306	dev_err(dev,
6d59ba2f LD	307	"light: mask value 0x%08lx not supported\n",
	308	mask);
	309	break;
	310	}
	311	if ((val != 125) && (val != 2000)) {
722fc316	312	dev_err(dev,
6d59ba2f LD	313	"lux scale %d is invalid [125, 2000]\n", val);
	314	break;
	315	}
	316	ret = isl29028_set_als_scale(chip, val);
	317	if (ret < 0) {
722fc316	318	dev_err(dev,
6d59ba2f LD	319	"Setting lux scale fail with error %d\n", ret);
	320	break;
	321	}
	322	chip->lux_scale = val;
	323	break;
	324
	325	default:
722fc316	326	dev_err(dev, "Unsupported channel type\n");
6d59ba2f LD	327	break;
	328	}
	329	mutex_unlock(&chip->lock);
	330	return ret;
	331	}
	332
	333	static int isl29028_read_raw(struct iio_dev *indio_dev,
ca52c88c ERR	334	struct iio_chan_spec const *chan,
ca52c88c ERR	335	int val, int val2, long mask)
6d59ba2f LD	336	{
6d59ba2f LD	337	struct isl29028_chip *chip = iio_priv(indio_dev);
722fc316	338	struct device *dev = regmap_get_device(chip->regmap);
6d59ba2f LD	339	int ret = -EINVAL;
	340
	341	mutex_lock(&chip->lock);
	342	switch (mask) {
a8c0ed75 JC	343	case IIO_CHAN_INFO_RAW:
a8c0ed75 JC	344	case IIO_CHAN_INFO_PROCESSED:
6d59ba2f LD	345	switch (chan->type) {
	346	case IIO_LIGHT:
	347	ret = isl29028_als_get(chip, val);
	348	break;
	349	case IIO_INTENSITY:
	350	ret = isl29028_ir_get(chip, val);
	351	break;
	352	case IIO_PROXIMITY:
	353	ret = isl29028_proxim_get(chip, val);
	354	break;
	355	default:
	356	break;
	357	}
	358	if (ret < 0)
	359	break;
	360	ret = IIO_VAL_INT;
	361	break;
	362
892cb6dc	363	case IIO_CHAN_INFO_SAMP_FREQ:
6d59ba2f LD	364	if (chan->type != IIO_PROXIMITY)
	365	break;
	366	*val = chip->prox_sampling;
	367	ret = IIO_VAL_INT;
	368	break;
	369
892cb6dc	370	case IIO_CHAN_INFO_SCALE:
6d59ba2f LD	371	if (chan->type != IIO_LIGHT)
	372	break;
	373	*val = chip->lux_scale;
	374	ret = IIO_VAL_INT;
	375	break;
	376
	377	default:
722fc316	378	dev_err(dev, "mask value 0x%08lx not supported\n", mask);
6d59ba2f LD	379	break;
	380	}
	381	mutex_unlock(&chip->lock);
	382	return ret;
	383	}
	384
	385	static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
b9b689c1 PMS	386	"1 3 5 10 13 20 83 100");
b9b689c1 PMS	387	static IIO_CONST_ATTR(in_illuminance_scale_available, "125 2000");
6d59ba2f LD	388
	389	#define ISL29028_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
	390	#define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
	391	static struct attribute *isl29028_attributes[] = {
	392	ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
	393	ISL29028_CONST_ATTR(in_illuminance_scale_available),
	394	NULL,
	395	};
	396
	397	static const struct attribute_group isl29108_group = {
	398	.attrs = isl29028_attributes,
	399	};
	400
	401	static const struct iio_chan_spec isl29028_channels[] = {
	402	{
	403	.type = IIO_LIGHT,
93a9fdff JC	404	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) \|
93a9fdff JC	405	BIT(IIO_CHAN_INFO_SCALE),
6d59ba2f LD	406	}, {
6d59ba2f LD	407	.type = IIO_INTENSITY,
93a9fdff	408	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
6d59ba2f LD	409	}, {
6d59ba2f LD	410	.type = IIO_PROXIMITY,
93a9fdff JC	411	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
93a9fdff JC	412	BIT(IIO_CHAN_INFO_SAMP_FREQ),
6d59ba2f LD	413	}
	414	};
	415
	416	static const struct iio_info isl29028_info = {
	417	.attrs = &isl29108_group,
	418	.driver_module = THIS_MODULE,
df271034 BG	419	.read_raw = isl29028_read_raw,
df271034 BG	420	.write_raw = isl29028_write_raw,
6d59ba2f LD	421	};
	422
	423	static int isl29028_chip_init(struct isl29028_chip *chip)
	424	{
722fc316	425	struct device *dev = regmap_get_device(chip->regmap);
6d59ba2f LD	426	int ret;
	427
	428	chip->enable_prox = false;
	429	chip->prox_sampling = 20;
	430	chip->lux_scale = 2000;
bafaa6de	431	chip->als_ir_mode = ISL29028_MODE_NONE;
6d59ba2f LD	432
	433	ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
	434	if (ret < 0) {
722fc316	435	dev_err(dev, "%s(): write to reg %d failed, err = %d\n",
6d59ba2f LD	436	__func__, ISL29028_REG_TEST1_MODE, ret);
	437	return ret;
	438	}
	439	ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
	440	if (ret < 0) {
722fc316	441	dev_err(dev, "%s(): write to reg %d failed, err = %d\n",
6d59ba2f LD	442	__func__, ISL29028_REG_TEST2_MODE, ret);
	443	return ret;
	444	}
	445
	446	ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
	447	if (ret < 0) {
722fc316	448	dev_err(dev, "%s(): write to reg %d failed, err = %d\n",
6d59ba2f LD	449	__func__, ISL29028_REG_CONFIGURE, ret);
	450	return ret;
	451	}
	452
	453	ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling);
	454	if (ret < 0) {
722fc316	455	dev_err(dev, "setting the proximity, err = %d\n", ret);
6d59ba2f LD	456	return ret;
	457	}
	458
	459	ret = isl29028_set_als_scale(chip, chip->lux_scale);
	460	if (ret < 0)
722fc316	461	dev_err(dev, "setting als scale failed, err = %d\n", ret);
6d59ba2f LD	462	return ret;
	463	}
	464
f6127704	465	static bool isl29028_is_volatile_reg(struct device *dev, unsigned int reg)
6d59ba2f LD	466	{
	467	switch (reg) {
	468	case ISL29028_REG_INTERRUPT:
	469	case ISL29028_REG_PROX_DATA:
	470	case ISL29028_REG_ALSIR_L:
	471	case ISL29028_REG_ALSIR_U:
	472	return true;
	473	default:
	474	return false;
	475	}
	476	}
	477
	478	static const struct regmap_config isl29028_regmap_config = {
	479	.reg_bits = 8,
	480	.val_bits = 8,
f6127704	481	.volatile_reg = isl29028_is_volatile_reg,
6d59ba2f LD	482	.max_register = ISL29028_NUM_REGS - 1,
	483	.num_reg_defaults_raw = ISL29028_NUM_REGS,
	484	.cache_type = REGCACHE_RBTREE,
	485	};
	486
4ae1c61f	487	static int isl29028_probe(struct i2c_client *client,
ca52c88c	488	const struct i2c_device_id *id)
6d59ba2f LD	489	{
	490	struct isl29028_chip *chip;
	491	struct iio_dev *indio_dev;
	492	int ret;
	493
80cab1da	494	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
6d59ba2f LD	495	if (!indio_dev) {
	496	dev_err(&client->dev, "iio allocation fails\n");
	497	return -ENOMEM;
	498	}
	499
	500	chip = iio_priv(indio_dev);
	501
	502	i2c_set_clientdata(client, indio_dev);
6d59ba2f LD	503	mutex_init(&chip->lock);
	504
	505	chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
	506	if (IS_ERR(chip->regmap)) {
	507	ret = PTR_ERR(chip->regmap);
722fc316 AS	508	dev_err(&client->dev, "regmap initialization failed: %d\n",
722fc316 AS	509	ret);
80cab1da	510	return ret;
6d59ba2f LD	511	}
	512
	513	ret = isl29028_chip_init(chip);
	514	if (ret < 0) {
722fc316	515	dev_err(&client->dev, "chip initialization failed: %d\n", ret);
80cab1da	516	return ret;
6d59ba2f LD	517	}
	518
	519	indio_dev->info = &isl29028_info;
	520	indio_dev->channels = isl29028_channels;
	521	indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
	522	indio_dev->name = id->name;
	523	indio_dev->dev.parent = &client->dev;
	524	indio_dev->modes = INDIO_DIRECT_MODE;
86727e30	525	ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
6d59ba2f	526	if (ret < 0) {
722fc316 AS	527	dev_err(&client->dev,
722fc316 AS	528	"iio registration fails with error %d\n",
6d59ba2f	529	ret);
80cab1da	530	return ret;
6d59ba2f LD	531	}
6d59ba2f LD	532	return 0;
6d59ba2f LD	533	}
6d59ba2f LD	534
6d59ba2f LD	535	static const struct i2c_device_id isl29028_id[] = {
	536	{"isl29028", 0},
	537	{}
	538	};
	539	MODULE_DEVICE_TABLE(i2c, isl29028_id);
	540
	541	static const struct of_device_id isl29028_of_match[] = {
37e5157d AE	542	{ .compatible = "isl,isl29028", }, /* for backward compat., don't use */
37e5157d AE	543	{ .compatible = "isil,isl29028", },
6d59ba2f LD	544	{ },
	545	};
	546	MODULE_DEVICE_TABLE(of, isl29028_of_match);
	547
	548	static struct i2c_driver isl29028_driver = {
6d59ba2f LD	549	.driver = {
6d59ba2f LD	550	.name = "isl29028",
6d59ba2f LD	551	.of_match_table = isl29028_of_match,
	552	},
	553	.probe = isl29028_probe,
6d59ba2f LD	554	.id_table = isl29028_id,
	555	};
	556
	557	module_i2c_driver(isl29028_driver);
	558
	559	MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
	560	MODULE_LICENSE("GPL v2");
	561	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");