[deliverable/linux.git] / drivers / staging / iio / light / isl29018.c

/*
 * A iio driver for the light sensor ISL 29018.
 *
 * IIO driver for monitoring ambient light intensity in luxi, proximity
 * sensing and infrared sensing.
 *
 * Copyright (c) 2010, NVIDIA Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA	02110-1301, USA.
 */

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

#define CONVERSION_TIME_MS		100

#define ISL29018_REG_ADD_COMMAND1	0x00
#define COMMMAND1_OPMODE_SHIFT		5
#define COMMMAND1_OPMODE_MASK		(7 << COMMMAND1_OPMODE_SHIFT)
#define COMMMAND1_OPMODE_POWER_DOWN	0
#define COMMMAND1_OPMODE_ALS_ONCE	1
#define COMMMAND1_OPMODE_IR_ONCE	2
#define COMMMAND1_OPMODE_PROX_ONCE	3

#define ISL29018_REG_ADD_COMMANDII	0x01
#define COMMANDII_RESOLUTION_SHIFT	2
#define COMMANDII_RESOLUTION_MASK	(0x3 << COMMANDII_RESOLUTION_SHIFT)

#define COMMANDII_RANGE_SHIFT		0
#define COMMANDII_RANGE_MASK		(0x3 << COMMANDII_RANGE_SHIFT)

#define COMMANDII_SCHEME_SHIFT		7
#define COMMANDII_SCHEME_MASK		(0x1 << COMMANDII_SCHEME_SHIFT)

#define ISL29018_REG_ADD_DATA_LSB	0x02
#define ISL29018_REG_ADD_DATA_MSB	0x03

#define ISL29018_REG_TEST		0x08
#define ISL29018_TEST_SHIFT		0
#define ISL29018_TEST_MASK		(0xFF << ISL29018_TEST_SHIFT)

struct isl29018_chip {
	struct device		*dev;
	struct regmap		*regmap;
	struct mutex		lock;
	unsigned int		lux_scale;
	unsigned int		range;
	unsigned int		adc_bit;
	int			prox_scheme;
};

static int isl29018_set_range(struct isl29018_chip *chip, unsigned long range,
		unsigned int *new_range)
{
	static const unsigned long supp_ranges[] = {1000, 4000, 16000, 64000};
	int i;

	for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) {
		if (range <= supp_ranges[i]) {
			*new_range = (unsigned int)supp_ranges[i];
			break;
		}
	}

	if (i >= ARRAY_SIZE(supp_ranges))
		return -EINVAL;

	return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
			COMMANDII_RANGE_MASK, i << COMMANDII_RANGE_SHIFT);
}

static int isl29018_set_resolution(struct isl29018_chip *chip,
			unsigned long adcbit, unsigned int *conf_adc_bit)
{
	static const unsigned long supp_adcbit[] = {16, 12, 8, 4};
	int i;

	for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) {
		if (adcbit >= supp_adcbit[i]) {
			*conf_adc_bit = (unsigned int)supp_adcbit[i];
			break;
		}
	}

	if (i >= ARRAY_SIZE(supp_adcbit))
		return -EINVAL;

	return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
			COMMANDII_RESOLUTION_MASK,
			i << COMMANDII_RESOLUTION_SHIFT);
}

static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
{
	int status;
	unsigned int lsb;
	unsigned int msb;

	/* Set mode */
	status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1,
			mode << COMMMAND1_OPMODE_SHIFT);
	if (status) {
		dev_err(chip->dev,
			"Error in setting operating mode err %d\n", status);
		return status;
	}
	msleep(CONVERSION_TIME_MS);
	status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb);
	if (status < 0) {
		dev_err(chip->dev,
			"Error in reading LSB DATA with err %d\n", status);
		return status;
	}

	status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb);
	if (status < 0) {
		dev_err(chip->dev,
			"Error in reading MSB DATA with error %d\n", status);
		return status;
	}
	dev_vdbg(chip->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);

	return (msb << 8) | lsb;
}

static int isl29018_read_lux(struct isl29018_chip *chip, int *lux)
{
	int lux_data;

	lux_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_ALS_ONCE);

	if (lux_data < 0)
		return lux_data;

	*lux = (lux_data * chip->range * chip->lux_scale) >> chip->adc_bit;

	return 0;
}

static int isl29018_read_ir(struct isl29018_chip *chip, int *ir)
{
	int ir_data;

	ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);

	if (ir_data < 0)
		return ir_data;

	*ir = ir_data;

	return 0;
}

static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme,
		int *near_ir)
{
	int status;
	int prox_data = -1;
	int ir_data = -1;

	/* Do proximity sensing with required scheme */
	status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
			COMMANDII_SCHEME_MASK,
			scheme << COMMANDII_SCHEME_SHIFT);
	if (status) {
		dev_err(chip->dev, "Error in setting operating mode\n");
		return status;
	}

	prox_data = isl29018_read_sensor_input(chip,
					COMMMAND1_OPMODE_PROX_ONCE);
	if (prox_data < 0)
		return prox_data;

	if (scheme == 1) {
		*near_ir = prox_data;
		return 0;
	}

	ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);

	if (ir_data < 0)
		return ir_data;

	if (prox_data >= ir_data)
		*near_ir = prox_data - ir_data;
	else
		*near_ir = 0;

	return 0;
}

/* Sysfs interface */
/* range */
static ssize_t show_range(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);

	return sprintf(buf, "%u\n", chip->range);
}

static ssize_t store_range(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);
	int status;
	unsigned long lval;
	unsigned int new_range;

	if (strict_strtoul(buf, 10, &lval))
		return -EINVAL;

	if (!(lval == 1000UL || lval == 4000UL ||
			lval == 16000UL || lval == 64000UL)) {
		dev_err(dev, "The range is not supported\n");
		return -EINVAL;
	}

	mutex_lock(&chip->lock);
	status = isl29018_set_range(chip, lval, &new_range);
	if (status < 0) {
		mutex_unlock(&chip->lock);
		dev_err(dev,
			"Error in setting max range with err %d\n", status);
		return status;
	}
	chip->range = new_range;
	mutex_unlock(&chip->lock);

	return count;
}

/* resolution */
static ssize_t show_resolution(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);

	return sprintf(buf, "%u\n", chip->adc_bit);
}

static ssize_t store_resolution(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);
	int status;
	unsigned long lval;
	unsigned int new_adc_bit;

	if (strict_strtoul(buf, 10, &lval))
		return -EINVAL;
	if (!(lval == 4 || lval == 8 || lval == 12 || lval == 16)) {
		dev_err(dev, "The resolution is not supported\n");
		return -EINVAL;
	}

	mutex_lock(&chip->lock);
	status = isl29018_set_resolution(chip, lval, &new_adc_bit);
	if (status < 0) {
		mutex_unlock(&chip->lock);
		dev_err(dev, "Error in setting resolution\n");
		return status;
	}
	chip->adc_bit = new_adc_bit;
	mutex_unlock(&chip->lock);

	return count;
}

/* proximity scheme */
static ssize_t show_prox_infrared_supression(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);

	/* return the "proximity scheme" i.e. if the chip does on chip
	infrared supression (1 means perform on chip supression) */
	return sprintf(buf, "%d\n", chip->prox_scheme);
}

static ssize_t store_prox_infrared_supression(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);
	unsigned long lval;

	if (strict_strtoul(buf, 10, &lval))
		return -EINVAL;
	if (!(lval == 0UL || lval == 1UL)) {
		dev_err(dev, "The mode is not supported\n");
		return -EINVAL;
	}

	/* get the  "proximity scheme" i.e. if the chip does on chip
	infrared supression (1 means perform on chip supression) */
	mutex_lock(&chip->lock);
	chip->prox_scheme = (int)lval;
	mutex_unlock(&chip->lock);

	return count;
}

/* Channel IO */
static int isl29018_write_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int val,
			      int val2,
			      long mask)
{
	struct isl29018_chip *chip = iio_priv(indio_dev);
	int ret = -EINVAL;

	mutex_lock(&chip->lock);
	if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) {
		chip->lux_scale = val;
		ret = 0;
	}
	mutex_unlock(&chip->lock);

	return 0;
}

static int isl29018_read_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int *val,
			     int *val2,
			     long mask)
{
	int ret = -EINVAL;
	struct isl29018_chip *chip = iio_priv(indio_dev);

	mutex_lock(&chip->lock);
	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	case IIO_CHAN_INFO_PROCESSED:
		switch (chan->type) {
		case IIO_LIGHT:
			ret = isl29018_read_lux(chip, val);
			break;
		case IIO_INTENSITY:
			ret = isl29018_read_ir(chip, val);
			break;
		case IIO_PROXIMITY:
			ret = isl29018_read_proximity_ir(chip,
					chip->prox_scheme, val);
			break;
		default:
			break;
		}
		if (!ret)
			ret = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_CALIBSCALE:
		if (chan->type == IIO_LIGHT) {
			*val = chip->lux_scale;
			ret = IIO_VAL_INT;
		}
		break;
	default:
		break;
	}
	mutex_unlock(&chip->lock);
	return ret;
}

static const struct iio_chan_spec isl29018_channels[] = {
	{
		.type = IIO_LIGHT,
		.indexed = 1,
		.channel = 0,
		.info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT |
		IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
	}, {
		.type = IIO_INTENSITY,
		.modified = 1,
		.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
		.channel2 = IIO_MOD_LIGHT_IR,
	}, {
		/* Unindexed in current ABI.  But perhaps it should be. */
		.type = IIO_PROXIMITY,
		.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
	}
};

static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, show_range, store_range, 0);
static IIO_CONST_ATTR(range_available, "1000 4000 16000 64000");
static IIO_CONST_ATTR(adc_resolution_available, "4 8 12 16");
static IIO_DEVICE_ATTR(adc_resolution, S_IRUGO | S_IWUSR,
					show_resolution, store_resolution, 0);
static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_supression,
					S_IRUGO | S_IWUSR,
					show_prox_infrared_supression,
					store_prox_infrared_supression, 0);

#define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
#define ISL29018_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
static struct attribute *isl29018_attributes[] = {
	ISL29018_DEV_ATTR(range),
	ISL29018_CONST_ATTR(range_available),
	ISL29018_DEV_ATTR(adc_resolution),
	ISL29018_CONST_ATTR(adc_resolution_available),
	ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_supression),
	NULL
};

static const struct attribute_group isl29108_group = {
	.attrs = isl29018_attributes,
};

static int isl29018_chip_init(struct isl29018_chip *chip)
{
	int status;
	int new_adc_bit;
	unsigned int new_range;

	/* Code added per Intersil Application Note 1534:
	 *     When VDD sinks to approximately 1.8V or below, some of
	 * the part's registers may change their state. When VDD
	 * recovers to 2.25V (or greater), the part may thus be in an
	 * unknown mode of operation. The user can return the part to
	 * a known mode of operation either by (a) setting VDD = 0V for
	 * 1 second or more and then powering back up with a slew rate
	 * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
	 * conversions, clear the test registers, and then rewrite all
	 * registers to the desired values.
	 * ...
	 * FOR ISL29011, ISL29018, ISL29021, ISL29023
	 * 1. Write 0x00 to register 0x08 (TEST)
	 * 2. Write 0x00 to register 0x00 (CMD1)
	 * 3. Rewrite all registers to the desired values
	 *
	 * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
	 * the same thing EXCEPT the data sheet asks for a 1ms delay after
	 * writing the CMD1 register.
	 */
	status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
	if (status < 0) {
		dev_err(chip->dev, "Failed to clear isl29018 TEST reg."
					"(%d)\n", status);
		return status;
	}

	/* See Intersil AN1534 comments above.
	 * "Operating Mode" (COMMAND1) register is reprogrammed when
	 * data is read from the device.
	 */
	status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0);
	if (status < 0) {
		dev_err(chip->dev, "Failed to clear isl29018 CMD1 reg."
					"(%d)\n", status);
		return status;
	}

	msleep(1);	/* per data sheet, page 10 */

	/* set defaults */
	status = isl29018_set_range(chip, chip->range, &new_range);
	if (status < 0) {
		dev_err(chip->dev, "Init of isl29018 fails\n");
		return status;
	}

	status = isl29018_set_resolution(chip, chip->adc_bit,
						&new_adc_bit);

	return 0;
}

static const struct iio_info isl29108_info = {
	.attrs = &isl29108_group,
	.driver_module = THIS_MODULE,
	.read_raw = &isl29018_read_raw,
	.write_raw = &isl29018_write_raw,
};

static bool is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case ISL29018_REG_ADD_DATA_LSB:
	case ISL29018_REG_ADD_DATA_MSB:
	case ISL29018_REG_ADD_COMMAND1:
	case ISL29018_REG_TEST:
		return true;
	default:
		return false;
	}
}

/*
 * isl29018_regmap_config: regmap configuration.
 * Use RBTREE mechanism for caching.
 */
static const struct regmap_config isl29018_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = is_volatile_reg,
	.max_register = ISL29018_REG_TEST,
	.num_reg_defaults_raw = ISL29018_REG_TEST + 1,
	.cache_type = REGCACHE_RBTREE,
};

static int __devinit isl29018_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct isl29018_chip *chip;
	struct iio_dev *indio_dev;
	int err;

	indio_dev = iio_allocate_device(sizeof(*chip));
	if (indio_dev == NULL) {
		dev_err(&client->dev, "iio allocation fails\n");
		err = -ENOMEM;
		goto exit;
	}
	chip = iio_priv(indio_dev);

	i2c_set_clientdata(client, indio_dev);
	chip->dev = &client->dev;

	mutex_init(&chip->lock);

	chip->lux_scale = 1;
	chip->range = 1000;
	chip->adc_bit = 16;

	chip->regmap = devm_regmap_init_i2c(client, &isl29018_regmap_config);
	if (IS_ERR(chip->regmap)) {
		err = PTR_ERR(chip->regmap);
		dev_err(chip->dev, "regmap initialization failed: %d\n", err);
		goto exit;
	}

	err = isl29018_chip_init(chip);
	if (err)
		goto exit_iio_free;

	indio_dev->info = &isl29108_info;
	indio_dev->channels = isl29018_channels;
	indio_dev->num_channels = ARRAY_SIZE(isl29018_channels);
	indio_dev->name = id->name;
	indio_dev->dev.parent = &client->dev;
	indio_dev->modes = INDIO_DIRECT_MODE;
	err = iio_device_register(indio_dev);
	if (err) {
		dev_err(&client->dev, "iio registration fails\n");
		goto exit_iio_free;
	}

	return 0;
exit_iio_free:
	iio_free_device(indio_dev);
exit:
	return err;
}

static int __devexit isl29018_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	dev_dbg(&client->dev, "%s()\n", __func__);
	iio_device_unregister(indio_dev);
	iio_free_device(indio_dev);

	return 0;
}

static const struct i2c_device_id isl29018_id[] = {
	{"isl29018", 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, isl29018_id);

static const struct of_device_id isl29018_of_match[] = {
	{ .compatible = "isil,isl29018", },
	{ },
};
MODULE_DEVICE_TABLE(of, isl29018_of_match);

static struct i2c_driver isl29018_driver = {
	.class	= I2C_CLASS_HWMON,
	.driver	 = {
			.name = "isl29018",
			.owner = THIS_MODULE,
			.of_match_table = isl29018_of_match,
		    },
	.probe	 = isl29018_probe,
	.remove	 = __devexit_p(isl29018_remove),
	.id_table = isl29018_id,
};
module_i2c_driver(isl29018_driver);

MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
94042874 RK	1	/*
	2	* A iio driver for the light sensor ISL 29018.
	3	*
	4	* IIO driver for monitoring ambient light intensity in luxi, proximity
	5	* sensing and infrared sensing.
	6	*
	7	* Copyright (c) 2010, NVIDIA Corporation.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but WITHOUT
	15	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	16	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	17	* more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/i2c.h>
	26	#include <linux/err.h>
	27	#include <linux/mutex.h>
	28	#include <linux/delay.h>
057340e3	29	#include <linux/regmap.h>
94042874	30	#include <linux/slab.h>
06458e27 JC	31	#include <linux/iio/iio.h>
06458e27 JC	32	#include <linux/iio/sysfs.h>
057340e3	33
94042874 RK	34	#define CONVERSION_TIME_MS 100
	35
	36	#define ISL29018_REG_ADD_COMMAND1 0x00
	37	#define COMMMAND1_OPMODE_SHIFT 5
	38	#define COMMMAND1_OPMODE_MASK (7 << COMMMAND1_OPMODE_SHIFT)
	39	#define COMMMAND1_OPMODE_POWER_DOWN 0
	40	#define COMMMAND1_OPMODE_ALS_ONCE 1
	41	#define COMMMAND1_OPMODE_IR_ONCE 2
	42	#define COMMMAND1_OPMODE_PROX_ONCE 3
	43
	44	#define ISL29018_REG_ADD_COMMANDII 0x01
	45	#define COMMANDII_RESOLUTION_SHIFT 2
	46	#define COMMANDII_RESOLUTION_MASK (0x3 << COMMANDII_RESOLUTION_SHIFT)
	47
	48	#define COMMANDII_RANGE_SHIFT 0
	49	#define COMMANDII_RANGE_MASK (0x3 << COMMANDII_RANGE_SHIFT)
	50
	51	#define COMMANDII_SCHEME_SHIFT 7
	52	#define COMMANDII_SCHEME_MASK (0x1 << COMMANDII_SCHEME_SHIFT)
	53
	54	#define ISL29018_REG_ADD_DATA_LSB 0x02
	55	#define ISL29018_REG_ADD_DATA_MSB 0x03
94042874	56
176f9f29 GG	57	#define ISL29018_REG_TEST 0x08
	58	#define ISL29018_TEST_SHIFT 0
	59	#define ISL29018_TEST_MASK (0xFF << ISL29018_TEST_SHIFT)
	60
94042874	61	struct isl29018_chip {
057340e3 LD	62	struct device *dev;
057340e3 LD	63	struct regmap *regmap;
94042874	64	struct mutex lock;
6d1ad0f8	65	unsigned int lux_scale;
94042874 RK	66	unsigned int range;
	67	unsigned int adc_bit;
	68	int prox_scheme;
94042874 RK	69	};
94042874 RK	70
057340e3	71	static int isl29018_set_range(struct isl29018_chip *chip, unsigned long range,
94042874 RK	72	unsigned int *new_range)
	73	{
	74	static const unsigned long supp_ranges[] = {1000, 4000, 16000, 64000};
	75	int i;
	76
	77	for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) {
	78	if (range <= supp_ranges[i]) {
	79	*new_range = (unsigned int)supp_ranges[i];
	80	break;
	81	}
	82	}
	83
	84	if (i >= ARRAY_SIZE(supp_ranges))
	85	return -EINVAL;
	86
057340e3 LD	87	return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
057340e3 LD	88	COMMANDII_RANGE_MASK, i << COMMANDII_RANGE_SHIFT);
94042874 RK	89	}
94042874 RK	90
057340e3	91	static int isl29018_set_resolution(struct isl29018_chip *chip,
94042874 RK	92	unsigned long adcbit, unsigned int *conf_adc_bit)
	93	{
	94	static const unsigned long supp_adcbit[] = {16, 12, 8, 4};
	95	int i;
	96
	97	for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) {
	98	if (adcbit >= supp_adcbit[i]) {
	99	*conf_adc_bit = (unsigned int)supp_adcbit[i];
	100	break;
	101	}
	102	}
	103
	104	if (i >= ARRAY_SIZE(supp_adcbit))
	105	return -EINVAL;
	106
057340e3 LD	107	return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
	108	COMMANDII_RESOLUTION_MASK,
	109	i << COMMANDII_RESOLUTION_SHIFT);
94042874 RK	110	}
94042874 RK	111
057340e3	112	static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
94042874 RK	113	{
94042874 RK	114	int status;
057340e3 LD	115	unsigned int lsb;
057340e3 LD	116	unsigned int msb;
94042874 RK	117
94042874 RK	118	/* Set mode */
057340e3 LD	119	status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1,
057340e3 LD	120	mode << COMMMAND1_OPMODE_SHIFT);
94042874	121	if (status) {
057340e3 LD	122	dev_err(chip->dev,
057340e3 LD	123	"Error in setting operating mode err %d\n", status);
94042874 RK	124	return status;
	125	}
	126	msleep(CONVERSION_TIME_MS);
057340e3 LD	127	status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb);
	128	if (status < 0) {
	129	dev_err(chip->dev,
	130	"Error in reading LSB DATA with err %d\n", status);
	131	return status;
94042874 RK	132	}
94042874 RK	133
057340e3 LD	134	status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb);
	135	if (status < 0) {
	136	dev_err(chip->dev,
	137	"Error in reading MSB DATA with error %d\n", status);
	138	return status;
94042874	139	}
057340e3	140	dev_vdbg(chip->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);
94042874 RK	141
	142	return (msb << 8) \| lsb;
	143	}
	144
057340e3	145	static int isl29018_read_lux(struct isl29018_chip chip, int lux)
94042874 RK	146	{
94042874 RK	147	int lux_data;
94042874	148
057340e3	149	lux_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_ALS_ONCE);
94042874 RK	150
	151	if (lux_data < 0)
	152	return lux_data;
	153
6d1ad0f8	154	lux = (lux_data chip->range * chip->lux_scale) >> chip->adc_bit;
94042874 RK	155
	156	return 0;
	157	}
	158
057340e3	159	static int isl29018_read_ir(struct isl29018_chip chip, int ir)
94042874 RK	160	{
	161	int ir_data;
	162
057340e3	163	ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);
94042874 RK	164
	165	if (ir_data < 0)
	166	return ir_data;
	167
	168	*ir = ir_data;
	169
	170	return 0;
	171	}
	172
057340e3	173	static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme,
94042874 RK	174	int *near_ir)
	175	{
	176	int status;
	177	int prox_data = -1;
	178	int ir_data = -1;
	179
	180	/* Do proximity sensing with required scheme */
057340e3 LD	181	status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
	182	COMMANDII_SCHEME_MASK,
	183	scheme << COMMANDII_SCHEME_SHIFT);
94042874	184	if (status) {
057340e3	185	dev_err(chip->dev, "Error in setting operating mode\n");
94042874 RK	186	return status;
	187	}
	188
057340e3	189	prox_data = isl29018_read_sensor_input(chip,
94042874 RK	190	COMMMAND1_OPMODE_PROX_ONCE);
	191	if (prox_data < 0)
	192	return prox_data;
	193
	194	if (scheme == 1) {
	195	*near_ir = prox_data;
	196	return 0;
	197	}
	198
057340e3	199	ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);
94042874 RK	200
	201	if (ir_data < 0)
	202	return ir_data;
	203
	204	if (prox_data >= ir_data)
	205	*near_ir = prox_data - ir_data;
	206	else
	207	*near_ir = 0;
	208
	209	return 0;
	210	}
	211
94042874 RK	212	/* Sysfs interface */
	213	/* range */
	214	static ssize_t show_range(struct device *dev,
	215	struct device_attribute attr, char buf)
	216	{
	217	struct iio_dev *indio_dev = dev_get_drvdata(dev);
927afbec	218	struct isl29018_chip *chip = iio_priv(indio_dev);
94042874 RK	219
	220	return sprintf(buf, "%u\n", chip->range);
	221	}
	222
	223	static ssize_t store_range(struct device *dev,
	224	struct device_attribute attr, const char buf, size_t count)
	225	{
	226	struct iio_dev *indio_dev = dev_get_drvdata(dev);
927afbec	227	struct isl29018_chip *chip = iio_priv(indio_dev);
94042874 RK	228	int status;
	229	unsigned long lval;
	230	unsigned int new_range;
	231
	232	if (strict_strtoul(buf, 10, &lval))
	233	return -EINVAL;
	234
	235	if (!(lval == 1000UL \|\| lval == 4000UL \|\|
	236	lval == 16000UL \|\| lval == 64000UL)) {
	237	dev_err(dev, "The range is not supported\n");
	238	return -EINVAL;
	239	}
	240
	241	mutex_lock(&chip->lock);
057340e3	242	status = isl29018_set_range(chip, lval, &new_range);
94042874 RK	243	if (status < 0) {
94042874 RK	244	mutex_unlock(&chip->lock);
057340e3 LD	245	dev_err(dev,
057340e3 LD	246	"Error in setting max range with err %d\n", status);
94042874 RK	247	return status;
	248	}
	249	chip->range = new_range;
	250	mutex_unlock(&chip->lock);
	251
	252	return count;
	253	}
	254
	255	/* resolution */
	256	static ssize_t show_resolution(struct device *dev,
	257	struct device_attribute attr, char buf)
	258	{
	259	struct iio_dev *indio_dev = dev_get_drvdata(dev);
927afbec	260	struct isl29018_chip *chip = iio_priv(indio_dev);
94042874 RK	261
	262	return sprintf(buf, "%u\n", chip->adc_bit);
	263	}
	264
	265	static ssize_t store_resolution(struct device *dev,
	266	struct device_attribute attr, const char buf, size_t count)
	267	{
	268	struct iio_dev *indio_dev = dev_get_drvdata(dev);
927afbec	269	struct isl29018_chip *chip = iio_priv(indio_dev);
94042874 RK	270	int status;
	271	unsigned long lval;
	272	unsigned int new_adc_bit;
	273
	274	if (strict_strtoul(buf, 10, &lval))
	275	return -EINVAL;
	276	if (!(lval == 4 \|\| lval == 8 \|\| lval == 12 \|\| lval == 16)) {
	277	dev_err(dev, "The resolution is not supported\n");
	278	return -EINVAL;
	279	}
	280
	281	mutex_lock(&chip->lock);
057340e3	282	status = isl29018_set_resolution(chip, lval, &new_adc_bit);
94042874 RK	283	if (status < 0) {
	284	mutex_unlock(&chip->lock);
	285	dev_err(dev, "Error in setting resolution\n");
	286	return status;
	287	}
	288	chip->adc_bit = new_adc_bit;
	289	mutex_unlock(&chip->lock);
	290
	291	return count;
	292	}
	293
	294	/* proximity scheme */
	295	static ssize_t show_prox_infrared_supression(struct device *dev,
	296	struct device_attribute attr, char buf)
	297	{
	298	struct iio_dev *indio_dev = dev_get_drvdata(dev);
927afbec	299	struct isl29018_chip *chip = iio_priv(indio_dev);
94042874 RK	300
	301	/* return the "proximity scheme" i.e. if the chip does on chip
	302	infrared supression (1 means perform on chip supression) */
	303	return sprintf(buf, "%d\n", chip->prox_scheme);
	304	}
	305
	306	static ssize_t store_prox_infrared_supression(struct device *dev,
	307	struct device_attribute attr, const char buf, size_t count)
	308	{
	309	struct iio_dev *indio_dev = dev_get_drvdata(dev);
927afbec	310	struct isl29018_chip *chip = iio_priv(indio_dev);
94042874 RK	311	unsigned long lval;
	312
	313	if (strict_strtoul(buf, 10, &lval))
	314	return -EINVAL;
	315	if (!(lval == 0UL \|\| lval == 1UL)) {
	316	dev_err(dev, "The mode is not supported\n");
	317	return -EINVAL;
	318	}
	319
	320	/* get the "proximity scheme" i.e. if the chip does on chip
	321	infrared supression (1 means perform on chip supression) */
	322	mutex_lock(&chip->lock);
	323	chip->prox_scheme = (int)lval;
	324	mutex_unlock(&chip->lock);
	325
	326	return count;
	327	}
	328
01e57c57 BF	329	/* Channel IO */
	330	static int isl29018_write_raw(struct iio_dev *indio_dev,
	331	struct iio_chan_spec const *chan,
	332	int val,
	333	int val2,
	334	long mask)
94042874	335	{
01e57c57 BF	336	struct isl29018_chip *chip = iio_priv(indio_dev);
01e57c57 BF	337	int ret = -EINVAL;
94042874	338
01e57c57	339	mutex_lock(&chip->lock);
c8a9f805	340	if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) {
01e57c57 BF	341	chip->lux_scale = val;
	342	ret = 0;
	343	}
	344	mutex_unlock(&chip->lock);
	345
	346	return 0;
94042874 RK	347	}
94042874 RK	348
01e57c57 BF	349	static int isl29018_read_raw(struct iio_dev *indio_dev,
	350	struct iio_chan_spec const *chan,
	351	int *val,
	352	int *val2,
	353	long mask)
94042874	354	{
01e57c57 BF	355	int ret = -EINVAL;
01e57c57 BF	356	struct isl29018_chip *chip = iio_priv(indio_dev);
01e57c57 BF	357
	358	mutex_lock(&chip->lock);
	359	switch (mask) {
90354d00 JC	360	case IIO_CHAN_INFO_RAW:
90354d00 JC	361	case IIO_CHAN_INFO_PROCESSED:
01e57c57 BF	362	switch (chan->type) {
01e57c57 BF	363	case IIO_LIGHT:
057340e3	364	ret = isl29018_read_lux(chip, val);
01e57c57 BF	365	break;
01e57c57 BF	366	case IIO_INTENSITY:
057340e3	367	ret = isl29018_read_ir(chip, val);
01e57c57 BF	368	break;
01e57c57 BF	369	case IIO_PROXIMITY:
057340e3	370	ret = isl29018_read_proximity_ir(chip,
01e57c57 BF	371	chip->prox_scheme, val);
	372	break;
	373	default:
	374	break;
	375	}
	376	if (!ret)
	377	ret = IIO_VAL_INT;
	378	break;
c8a9f805	379	case IIO_CHAN_INFO_CALIBSCALE:
01e57c57 BF	380	if (chan->type == IIO_LIGHT) {
	381	*val = chip->lux_scale;
	382	ret = IIO_VAL_INT;
	383	}
	384	break;
	385	default:
	386	break;
	387	}
	388	mutex_unlock(&chip->lock);
	389	return ret;
94042874 RK	390	}
94042874 RK	391
01e57c57 BF	392	static const struct iio_chan_spec isl29018_channels[] = {
	393	{
	394	.type = IIO_LIGHT,
	395	.indexed = 1,
	396	.channel = 0,
90354d00 JC	397	.info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT \|
90354d00 JC	398	IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
01e57c57 BF	399	}, {
	400	.type = IIO_INTENSITY,
	401	.modified = 1,
90354d00	402	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
01e57c57 BF	403	.channel2 = IIO_MOD_LIGHT_IR,
	404	}, {
	405	/* Unindexed in current ABI. But perhaps it should be. */
	406	.type = IIO_PROXIMITY,
90354d00	407	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
01e57c57 BF	408	}
	409	};
	410
94042874 RK	411	static IIO_DEVICE_ATTR(range, S_IRUGO \| S_IWUSR, show_range, store_range, 0);
	412	static IIO_CONST_ATTR(range_available, "1000 4000 16000 64000");
	413	static IIO_CONST_ATTR(adc_resolution_available, "4 8 12 16");
	414	static IIO_DEVICE_ATTR(adc_resolution, S_IRUGO \| S_IWUSR,
	415	show_resolution, store_resolution, 0);
	416	static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_supression,
	417	S_IRUGO \| S_IWUSR,
	418	show_prox_infrared_supression,
	419	store_prox_infrared_supression, 0);
94042874 RK	420
	421	#define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
	422	#define ISL29018_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
	423	static struct attribute *isl29018_attributes[] = {
94042874 RK	424	ISL29018_DEV_ATTR(range),
	425	ISL29018_CONST_ATTR(range_available),
	426	ISL29018_DEV_ATTR(adc_resolution),
	427	ISL29018_CONST_ATTR(adc_resolution_available),
	428	ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_supression),
94042874 RK	429	NULL
	430	};
	431
	432	static const struct attribute_group isl29108_group = {
	433	.attrs = isl29018_attributes,
	434	};
	435
057340e3	436	static int isl29018_chip_init(struct isl29018_chip *chip)
94042874	437	{
94042874 RK	438	int status;
	439	int new_adc_bit;
	440	unsigned int new_range;
	441
176f9f29 GG	442	/* Code added per Intersil Application Note 1534:
	443	* When VDD sinks to approximately 1.8V or below, some of
	444	* the part's registers may change their state. When VDD
	445	* recovers to 2.25V (or greater), the part may thus be in an
	446	* unknown mode of operation. The user can return the part to
	447	* a known mode of operation either by (a) setting VDD = 0V for
	448	* 1 second or more and then powering back up with a slew rate
	449	* of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
	450	* conversions, clear the test registers, and then rewrite all
	451	* registers to the desired values.
	452	* ...
	453	* FOR ISL29011, ISL29018, ISL29021, ISL29023
	454	* 1. Write 0x00 to register 0x08 (TEST)
	455	* 2. Write 0x00 to register 0x00 (CMD1)
	456	* 3. Rewrite all registers to the desired values
	457	*
	458	* ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
	459	* the same thing EXCEPT the data sheet asks for a 1ms delay after
	460	* writing the CMD1 register.
	461	*/
057340e3	462	status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
176f9f29	463	if (status < 0) {
057340e3	464	dev_err(chip->dev, "Failed to clear isl29018 TEST reg."
176f9f29 GG	465	"(%d)\n", status);
	466	return status;
	467	}
	468
	469	/* See Intersil AN1534 comments above.
	470	* "Operating Mode" (COMMAND1) register is reprogrammed when
	471	* data is read from the device.
	472	*/
057340e3	473	status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0);
176f9f29	474	if (status < 0) {
057340e3	475	dev_err(chip->dev, "Failed to clear isl29018 CMD1 reg."
176f9f29 GG	476	"(%d)\n", status);
	477	return status;
	478	}
	479
	480	msleep(1); /* per data sheet, page 10 */
	481
94042874	482	/* set defaults */
057340e3	483	status = isl29018_set_range(chip, chip->range, &new_range);
94042874	484	if (status < 0) {
057340e3	485	dev_err(chip->dev, "Init of isl29018 fails\n");
94042874 RK	486	return status;
	487	}
	488
057340e3	489	status = isl29018_set_resolution(chip, chip->adc_bit,
94042874 RK	490	&new_adc_bit);
	491
	492	return 0;
	493	}
	494
6fe8135f JC	495	static const struct iio_info isl29108_info = {
	496	.attrs = &isl29108_group,
	497	.driver_module = THIS_MODULE,
01e57c57 BF	498	.read_raw = &isl29018_read_raw,
01e57c57 BF	499	.write_raw = &isl29018_write_raw,
6fe8135f JC	500	};
6fe8135f JC	501
057340e3 LD	502	static bool is_volatile_reg(struct device *dev, unsigned int reg)
	503	{
	504	switch (reg) {
	505	case ISL29018_REG_ADD_DATA_LSB:
	506	case ISL29018_REG_ADD_DATA_MSB:
	507	case ISL29018_REG_ADD_COMMAND1:
	508	case ISL29018_REG_TEST:
	509	return true;
	510	default:
	511	return false;
	512	}
	513	}
	514
	515	/*
	516	* isl29018_regmap_config: regmap configuration.
	517	* Use RBTREE mechanism for caching.
	518	*/
	519	static const struct regmap_config isl29018_regmap_config = {
	520	.reg_bits = 8,
	521	.val_bits = 8,
	522	.volatile_reg = is_volatile_reg,
	523	.max_register = ISL29018_REG_TEST,
	524	.num_reg_defaults_raw = ISL29018_REG_TEST + 1,
	525	.cache_type = REGCACHE_RBTREE,
	526	};
	527
94042874 RK	528	static int __devinit isl29018_probe(struct i2c_client *client,
	529	const struct i2c_device_id *id)
	530	{
	531	struct isl29018_chip *chip;
927afbec	532	struct iio_dev *indio_dev;
94042874 RK	533	int err;
94042874 RK	534
927afbec JC	535	indio_dev = iio_allocate_device(sizeof(*chip));
	536	if (indio_dev == NULL) {
	537	dev_err(&client->dev, "iio allocation fails\n");
94042874 RK	538	err = -ENOMEM;
	539	goto exit;
	540	}
927afbec	541	chip = iio_priv(indio_dev);
94042874	542
927afbec	543	i2c_set_clientdata(client, indio_dev);
057340e3	544	chip->dev = &client->dev;
94042874 RK	545
	546	mutex_init(&chip->lock);
	547
6d1ad0f8	548	chip->lux_scale = 1;
94042874 RK	549	chip->range = 1000;
	550	chip->adc_bit = 16;
	551
057340e3 LD	552	chip->regmap = devm_regmap_init_i2c(client, &isl29018_regmap_config);
	553	if (IS_ERR(chip->regmap)) {
	554	err = PTR_ERR(chip->regmap);
	555	dev_err(chip->dev, "regmap initialization failed: %d\n", err);
	556	goto exit;
	557	}
	558
	559	err = isl29018_chip_init(chip);
94042874	560	if (err)
927afbec	561	goto exit_iio_free;
94042874	562
927afbec	563	indio_dev->info = &isl29108_info;
01e57c57 BF	564	indio_dev->channels = isl29018_channels;
01e57c57 BF	565	indio_dev->num_channels = ARRAY_SIZE(isl29018_channels);
927afbec JC	566	indio_dev->name = id->name;
	567	indio_dev->dev.parent = &client->dev;
	568	indio_dev->modes = INDIO_DIRECT_MODE;
	569	err = iio_device_register(indio_dev);
94042874 RK	570	if (err) {
	571	dev_err(&client->dev, "iio registration fails\n");
	572	goto exit_iio_free;
	573	}
	574
	575	return 0;
	576	exit_iio_free:
927afbec	577	iio_free_device(indio_dev);
94042874 RK	578	exit:
	579	return err;
	580	}
	581
	582	static int __devexit isl29018_remove(struct i2c_client *client)
	583	{
927afbec	584	struct iio_dev *indio_dev = i2c_get_clientdata(client);
94042874 RK	585
94042874 RK	586	dev_dbg(&client->dev, "%s()\n", __func__);
927afbec	587	iio_device_unregister(indio_dev);
d2fffd6c	588	iio_free_device(indio_dev);
94042874 RK	589
	590	return 0;
	591	}
	592
	593	static const struct i2c_device_id isl29018_id[] = {
	594	{"isl29018", 0},
	595	{}
	596	};
	597
	598	MODULE_DEVICE_TABLE(i2c, isl29018_id);
	599
4ee19524	600	static const struct of_device_id isl29018_of_match[] = {
610202dd	601	{ .compatible = "isil,isl29018", },
4ee19524 OJ	602	{ },
	603	};
	604	MODULE_DEVICE_TABLE(of, isl29018_of_match);
	605
94042874 RK	606	static struct i2c_driver isl29018_driver = {
	607	.class = I2C_CLASS_HWMON,
	608	.driver = {
	609	.name = "isl29018",
	610	.owner = THIS_MODULE,
4ee19524	611	.of_match_table = isl29018_of_match,
94042874 RK	612	},
	613	.probe = isl29018_probe,
	614	.remove = __devexit_p(isl29018_remove),
	615	.id_table = isl29018_id,
	616	};
6e5af184	617	module_i2c_driver(isl29018_driver);
94042874 RK	618
	619	MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
	620	MODULE_LICENSE("GPL");