[linux-block.git] / drivers / misc / isl29003.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  isl29003.c - Linux kernel module for
 * 	Intersil ISL29003 ambient light sensor
 *
 *  See file:Documentation/misc-devices/isl29003.rst
 *
 *  Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 *
 *  Based on code written by
 *  	Rodolfo Giometti <giometti@linux.it>
 *  	Eurotech S.p.A. <info@eurotech.it>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/delay.h>

#define ISL29003_DRV_NAME	"isl29003"
#define DRIVER_VERSION		"1.0"

#define ISL29003_REG_COMMAND		0x00
#define ISL29003_ADC_ENABLED		(1 << 7)
#define ISL29003_ADC_PD			(1 << 6)
#define ISL29003_TIMING_INT		(1 << 5)
#define ISL29003_MODE_SHIFT		(2)
#define ISL29003_MODE_MASK		(0x3 << ISL29003_MODE_SHIFT)
#define ISL29003_RES_SHIFT		(0)
#define ISL29003_RES_MASK		(0x3 << ISL29003_RES_SHIFT)

#define ISL29003_REG_CONTROL		0x01
#define ISL29003_INT_FLG		(1 << 5)
#define ISL29003_RANGE_SHIFT		(2)
#define ISL29003_RANGE_MASK		(0x3 << ISL29003_RANGE_SHIFT)
#define ISL29003_INT_PERSISTS_SHIFT	(0)
#define ISL29003_INT_PERSISTS_MASK	(0xf << ISL29003_INT_PERSISTS_SHIFT)

#define ISL29003_REG_IRQ_THRESH_HI	0x02
#define ISL29003_REG_IRQ_THRESH_LO	0x03
#define ISL29003_REG_LSB_SENSOR		0x04
#define ISL29003_REG_MSB_SENSOR		0x05
#define ISL29003_REG_LSB_TIMER		0x06
#define ISL29003_REG_MSB_TIMER		0x07

#define ISL29003_NUM_CACHABLE_REGS	4

struct isl29003_data {
	struct i2c_client *client;
	struct mutex lock;
	u8 reg_cache[ISL29003_NUM_CACHABLE_REGS];
	u8 power_state_before_suspend;
};

static int gain_range[] = {
	1000, 4000, 16000, 64000
};

/*
 * register access helpers
 */

static int __isl29003_read_reg(struct i2c_client *client,
			       u32 reg, u8 mask, u8 shift)
{
	struct isl29003_data *data = i2c_get_clientdata(client);

	return (data->reg_cache[reg] & mask) >> shift;
}

static int __isl29003_write_reg(struct i2c_client *client,
				u32 reg, u8 mask, u8 shift, u8 val)
{
	struct isl29003_data *data = i2c_get_clientdata(client);
	int ret = 0;
	u8 tmp;

	if (reg >= ISL29003_NUM_CACHABLE_REGS)
		return -EINVAL;

	mutex_lock(&data->lock);

	tmp = data->reg_cache[reg];
	tmp &= ~mask;
	tmp |= val << shift;

	ret = i2c_smbus_write_byte_data(client, reg, tmp);
	if (!ret)
		data->reg_cache[reg] = tmp;

	mutex_unlock(&data->lock);
	return ret;
}

/*
 * internally used functions
 */

/* range */
static int isl29003_get_range(struct i2c_client *client)
{
	return __isl29003_read_reg(client, ISL29003_REG_CONTROL,
		ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT);
}

static int isl29003_set_range(struct i2c_client *client, int range)
{
	return __isl29003_write_reg(client, ISL29003_REG_CONTROL,
		ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT, range);
}

/* resolution */
static int isl29003_get_resolution(struct i2c_client *client)
{
	return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
		ISL29003_RES_MASK, ISL29003_RES_SHIFT);
}

static int isl29003_set_resolution(struct i2c_client *client, int res)
{
	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
		ISL29003_RES_MASK, ISL29003_RES_SHIFT, res);
}

/* mode */
static int isl29003_get_mode(struct i2c_client *client)
{
	return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
		ISL29003_MODE_MASK, ISL29003_MODE_SHIFT);
}

static int isl29003_set_mode(struct i2c_client *client, int mode)
{
	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
		ISL29003_MODE_MASK, ISL29003_MODE_SHIFT, mode);
}

/* power_state */
static int isl29003_set_power_state(struct i2c_client *client, int state)
{
	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
				ISL29003_ADC_ENABLED | ISL29003_ADC_PD, 0,
				state ? ISL29003_ADC_ENABLED : ISL29003_ADC_PD);
}

static int isl29003_get_power_state(struct i2c_client *client)
{
	struct isl29003_data *data = i2c_get_clientdata(client);
	u8 cmdreg = data->reg_cache[ISL29003_REG_COMMAND];

	return ~cmdreg & ISL29003_ADC_PD;
}

static int isl29003_get_adc_value(struct i2c_client *client)
{
	struct isl29003_data *data = i2c_get_clientdata(client);
	int lsb, msb, range, bitdepth;

	mutex_lock(&data->lock);
	lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR);

	if (lsb < 0) {
		mutex_unlock(&data->lock);
		return lsb;
	}

	msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR);
	mutex_unlock(&data->lock);

	if (msb < 0)
		return msb;

	range = isl29003_get_range(client);
	bitdepth = (4 - isl29003_get_resolution(client)) * 4;
	return (((msb << 8) | lsb) * gain_range[range]) >> bitdepth;
}

/*
 * sysfs layer
 */

/* range */
static ssize_t isl29003_show_range(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);

	return sprintf(buf, "%i\n", isl29003_get_range(client));
}

static ssize_t isl29003_store_range(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned long val;
	int ret;

	ret = kstrtoul(buf, 10, &val);
	if (ret)
		return ret;

	if (val > 3)
		return -EINVAL;

	ret = isl29003_set_range(client, val);
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR(range, S_IWUSR | S_IRUGO,
		   isl29003_show_range, isl29003_store_range);


/* resolution */
static ssize_t isl29003_show_resolution(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);

	return sprintf(buf, "%d\n", isl29003_get_resolution(client));
}

static ssize_t isl29003_store_resolution(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned long val;
	int ret;

	ret = kstrtoul(buf, 10, &val);
	if (ret)
		return ret;

	if (val > 3)
		return -EINVAL;

	ret = isl29003_set_resolution(client, val);
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR(resolution, S_IWUSR | S_IRUGO,
		   isl29003_show_resolution, isl29003_store_resolution);

/* mode */
static ssize_t isl29003_show_mode(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);

	return sprintf(buf, "%d\n", isl29003_get_mode(client));
}

static ssize_t isl29003_store_mode(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned long val;
	int ret;

	ret = kstrtoul(buf, 10, &val);
	if (ret)
		return ret;

	if (val > 2)
		return -EINVAL;

	ret = isl29003_set_mode(client, val);
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
		   isl29003_show_mode, isl29003_store_mode);


/* power state */
static ssize_t isl29003_show_power_state(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);

	return sprintf(buf, "%d\n", isl29003_get_power_state(client));
}

static ssize_t isl29003_store_power_state(struct device *dev,
					  struct device_attribute *attr,
					  const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned long val;
	int ret;

	ret = kstrtoul(buf, 10, &val);
	if (ret)
		return ret;

	if (val > 1)
		return -EINVAL;

	ret = isl29003_set_power_state(client, val);
	return ret ? ret : count;
}

static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO,
		   isl29003_show_power_state, isl29003_store_power_state);


/* lux */
static ssize_t isl29003_show_lux(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);

	/* No LUX data if not operational */
	if (!isl29003_get_power_state(client))
		return -EBUSY;

	return sprintf(buf, "%d\n", isl29003_get_adc_value(client));
}

static DEVICE_ATTR(lux, S_IRUGO, isl29003_show_lux, NULL);

static struct attribute *isl29003_attributes[] = {
	&dev_attr_range.attr,
	&dev_attr_resolution.attr,
	&dev_attr_mode.attr,
	&dev_attr_power_state.attr,
	&dev_attr_lux.attr,
	NULL
};

static const struct attribute_group isl29003_attr_group = {
	.attrs = isl29003_attributes,
};

static int isl29003_init_client(struct i2c_client *client)
{
	struct isl29003_data *data = i2c_get_clientdata(client);
	int i;

	/* read all the registers once to fill the cache.
	 * if one of the reads fails, we consider the init failed */
	for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) {
		int v = i2c_smbus_read_byte_data(client, i);

		if (v < 0)
			return -ENODEV;

		data->reg_cache[i] = v;
	}

	/* set defaults */
	isl29003_set_range(client, 0);
	isl29003_set_resolution(client, 0);
	isl29003_set_mode(client, 0);
	isl29003_set_power_state(client, 0);

	return 0;
}

/*
 * I2C layer
 */

static int isl29003_probe(struct i2c_client *client,
				    const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct isl29003_data *data;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
		return -EIO;

	data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	i2c_set_clientdata(client, data);
	mutex_init(&data->lock);

	/* initialize the ISL29003 chip */
	err = isl29003_init_client(client);
	if (err)
		goto exit_kfree;

	/* register sysfs hooks */
	err = sysfs_create_group(&client->dev.kobj, &isl29003_attr_group);
	if (err)
		goto exit_kfree;

	dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION);
	return 0;

exit_kfree:
	kfree(data);
	return err;
}

static int isl29003_remove(struct i2c_client *client)
{
	sysfs_remove_group(&client->dev.kobj, &isl29003_attr_group);
	isl29003_set_power_state(client, 0);
	kfree(i2c_get_clientdata(client));
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int isl29003_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct isl29003_data *data = i2c_get_clientdata(client);

	data->power_state_before_suspend = isl29003_get_power_state(client);
	return isl29003_set_power_state(client, 0);
}

static int isl29003_resume(struct device *dev)
{
	int i;
	struct i2c_client *client = to_i2c_client(dev);
	struct isl29003_data *data = i2c_get_clientdata(client);

	/* restore registers from cache */
	for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
		if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
			return -EIO;

	return isl29003_set_power_state(client,
		data->power_state_before_suspend);
}

static SIMPLE_DEV_PM_OPS(isl29003_pm_ops, isl29003_suspend, isl29003_resume);
#define ISL29003_PM_OPS (&isl29003_pm_ops)

#else
#define ISL29003_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */

static const struct i2c_device_id isl29003_id[] = {
	{ "isl29003", 0 },
	{}
};
MODULE_DEVICE_TABLE(i2c, isl29003_id);

static struct i2c_driver isl29003_driver = {
	.driver = {
		.name	= ISL29003_DRV_NAME,
		.pm	= ISL29003_PM_OPS,
	},
	.probe	= isl29003_probe,
	.remove	= isl29003_remove,
	.id_table = isl29003_id,
};

module_i2c_driver(isl29003_driver);

MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("ISL29003 ambient light sensor driver");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRIVER_VERSION);
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
3cdbbeeb DM	2	/*
	3	* isl29003.c - Linux kernel module for
	4	* Intersil ISL29003 ambient light sensor
	5	*
9b5db89e	6	* See file:Documentation/misc-devices/isl29003.rst
3cdbbeeb DM	7	*
	8	* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
	9	*
	10	* Based on code written by
	11	* Rodolfo Giometti <giometti@linux.it>
	12	* Eurotech S.p.A. <info@eurotech.it>
3cdbbeeb DM	13	*/
	14
	15	#include <linux/module.h>
3cdbbeeb DM	16	#include <linux/slab.h>
	17	#include <linux/i2c.h>
	18	#include <linux/mutex.h>
	19	#include <linux/delay.h>
	20
	21	#define ISL29003_DRV_NAME "isl29003"
	22	#define DRIVER_VERSION "1.0"
	23
	24	#define ISL29003_REG_COMMAND 0x00
	25	#define ISL29003_ADC_ENABLED (1 << 7)
	26	#define ISL29003_ADC_PD (1 << 6)
	27	#define ISL29003_TIMING_INT (1 << 5)
	28	#define ISL29003_MODE_SHIFT (2)
	29	#define ISL29003_MODE_MASK (0x3 << ISL29003_MODE_SHIFT)
	30	#define ISL29003_RES_SHIFT (0)
	31	#define ISL29003_RES_MASK (0x3 << ISL29003_RES_SHIFT)
	32
	33	#define ISL29003_REG_CONTROL 0x01
	34	#define ISL29003_INT_FLG (1 << 5)
	35	#define ISL29003_RANGE_SHIFT (2)
	36	#define ISL29003_RANGE_MASK (0x3 << ISL29003_RANGE_SHIFT)
	37	#define ISL29003_INT_PERSISTS_SHIFT (0)
	38	#define ISL29003_INT_PERSISTS_MASK (0xf << ISL29003_INT_PERSISTS_SHIFT)
	39
	40	#define ISL29003_REG_IRQ_THRESH_HI 0x02
	41	#define ISL29003_REG_IRQ_THRESH_LO 0x03
	42	#define ISL29003_REG_LSB_SENSOR 0x04
	43	#define ISL29003_REG_MSB_SENSOR 0x05
	44	#define ISL29003_REG_LSB_TIMER 0x06
	45	#define ISL29003_REG_MSB_TIMER 0x07
	46
	47	#define ISL29003_NUM_CACHABLE_REGS 4
	48
	49	struct isl29003_data {
	50	struct i2c_client *client;
	51	struct mutex lock;
	52	u8 reg_cache[ISL29003_NUM_CACHABLE_REGS];
74614f8d	53	u8 power_state_before_suspend;
3cdbbeeb DM	54	};
	55
	56	static int gain_range[] = {
	57	1000, 4000, 16000, 64000
	58	};
	59
	60	/*
	61	* register access helpers
	62	*/
	63
	64	static int __isl29003_read_reg(struct i2c_client *client,
	65	u32 reg, u8 mask, u8 shift)
	66	{
	67	struct isl29003_data *data = i2c_get_clientdata(client);
05eec0c9	68
3cdbbeeb DM	69	return (data->reg_cache[reg] & mask) >> shift;
	70	}
	71
	72	static int __isl29003_write_reg(struct i2c_client *client,
	73	u32 reg, u8 mask, u8 shift, u8 val)
	74	{
	75	struct isl29003_data *data = i2c_get_clientdata(client);
	76	int ret = 0;
	77	u8 tmp;
	78
	79	if (reg >= ISL29003_NUM_CACHABLE_REGS)
	80	return -EINVAL;
	81
	82	mutex_lock(&data->lock);
	83
	84	tmp = data->reg_cache[reg];
	85	tmp &= ~mask;
	86	tmp \|= val << shift;
	87
	88	ret = i2c_smbus_write_byte_data(client, reg, tmp);
	89	if (!ret)
	90	data->reg_cache[reg] = tmp;
	91
	92	mutex_unlock(&data->lock);
	93	return ret;
	94	}
	95
	96	/*
	97	* internally used functions
	98	*/
	99
	100	/* range */
	101	static int isl29003_get_range(struct i2c_client *client)
	102	{
	103	return __isl29003_read_reg(client, ISL29003_REG_CONTROL,
	104	ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT);
	105	}
	106
	107	static int isl29003_set_range(struct i2c_client *client, int range)
	108	{
	109	return __isl29003_write_reg(client, ISL29003_REG_CONTROL,
	110	ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT, range);
	111	}
	112
	113	/* resolution */
	114	static int isl29003_get_resolution(struct i2c_client *client)
	115	{
	116	return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
	117	ISL29003_RES_MASK, ISL29003_RES_SHIFT);
	118	}
	119
	120	static int isl29003_set_resolution(struct i2c_client *client, int res)
	121	{
	122	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
	123	ISL29003_RES_MASK, ISL29003_RES_SHIFT, res);
	124	}
	125
	126	/* mode */
	127	static int isl29003_get_mode(struct i2c_client *client)
	128	{
	129	return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
a73a0712	130	ISL29003_MODE_MASK, ISL29003_MODE_SHIFT);
3cdbbeeb DM	131	}
	132
	133	static int isl29003_set_mode(struct i2c_client *client, int mode)
	134	{
	135	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
a73a0712	136	ISL29003_MODE_MASK, ISL29003_MODE_SHIFT, mode);
3cdbbeeb DM	137	}
	138
	139	/* power_state */
	140	static int isl29003_set_power_state(struct i2c_client *client, int state)
	141	{
	142	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
	143	ISL29003_ADC_ENABLED \| ISL29003_ADC_PD, 0,
	144	state ? ISL29003_ADC_ENABLED : ISL29003_ADC_PD);
	145	}
	146
	147	static int isl29003_get_power_state(struct i2c_client *client)
	148	{
	149	struct isl29003_data *data = i2c_get_clientdata(client);
	150	u8 cmdreg = data->reg_cache[ISL29003_REG_COMMAND];
05eec0c9	151
3cdbbeeb DM	152	return ~cmdreg & ISL29003_ADC_PD;
	153	}
	154
	155	static int isl29003_get_adc_value(struct i2c_client *client)
	156	{
	157	struct isl29003_data *data = i2c_get_clientdata(client);
	158	int lsb, msb, range, bitdepth;
	159
	160	mutex_lock(&data->lock);
	161	lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR);
	162
	163	if (lsb < 0) {
	164	mutex_unlock(&data->lock);
	165	return lsb;
	166	}
	167
	168	msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR);
	169	mutex_unlock(&data->lock);
	170
	171	if (msb < 0)
	172	return msb;
	173
	174	range = isl29003_get_range(client);
	175	bitdepth = (4 - isl29003_get_resolution(client)) * 4;
	176	return (((msb << 8) \| lsb) * gain_range[range]) >> bitdepth;
	177	}
	178
	179	/*
	180	* sysfs layer
	181	*/
	182
	183	/* range */
	184	static ssize_t isl29003_show_range(struct device *dev,
	185	struct device_attribute attr, char buf)
	186	{
	187	struct i2c_client *client = to_i2c_client(dev);
05eec0c9	188
3cdbbeeb DM	189	return sprintf(buf, "%i\n", isl29003_get_range(client));
	190	}
	191
	192	static ssize_t isl29003_store_range(struct device *dev,
	193	struct device_attribute *attr,
	194	const char *buf, size_t count)
	195	{
	196	struct i2c_client *client = to_i2c_client(dev);
	197	unsigned long val;
	198	int ret;
	199
f7b41276 JH	200	ret = kstrtoul(buf, 10, &val);
	201	if (ret)
	202	return ret;
	203
	204	if (val > 3)
3cdbbeeb DM	205	return -EINVAL;
	206
	207	ret = isl29003_set_range(client, val);
	208	if (ret < 0)
	209	return ret;
	210
	211	return count;
	212	}
	213
	214	static DEVICE_ATTR(range, S_IWUSR \| S_IRUGO,
	215	isl29003_show_range, isl29003_store_range);
	216
	217
	218	/* resolution */
	219	static ssize_t isl29003_show_resolution(struct device *dev,
	220	struct device_attribute *attr,
	221	char *buf)
	222	{
	223	struct i2c_client *client = to_i2c_client(dev);
05eec0c9	224
3cdbbeeb DM	225	return sprintf(buf, "%d\n", isl29003_get_resolution(client));
	226	}
	227
	228	static ssize_t isl29003_store_resolution(struct device *dev,
	229	struct device_attribute *attr,
	230	const char *buf, size_t count)
	231	{
	232	struct i2c_client *client = to_i2c_client(dev);
	233	unsigned long val;
	234	int ret;
	235
f7b41276 JH	236	ret = kstrtoul(buf, 10, &val);
	237	if (ret)
	238	return ret;
	239
	240	if (val > 3)
3cdbbeeb DM	241	return -EINVAL;
	242
	243	ret = isl29003_set_resolution(client, val);
	244	if (ret < 0)
	245	return ret;
	246
	247	return count;
	248	}
	249
	250	static DEVICE_ATTR(resolution, S_IWUSR \| S_IRUGO,
	251	isl29003_show_resolution, isl29003_store_resolution);
	252
	253	/* mode */
	254	static ssize_t isl29003_show_mode(struct device *dev,
	255	struct device_attribute attr, char buf)
	256	{
	257	struct i2c_client *client = to_i2c_client(dev);
05eec0c9	258
3cdbbeeb DM	259	return sprintf(buf, "%d\n", isl29003_get_mode(client));
	260	}
	261
	262	static ssize_t isl29003_store_mode(struct device *dev,
	263	struct device_attribute attr, const char buf, size_t count)
	264	{
	265	struct i2c_client *client = to_i2c_client(dev);
	266	unsigned long val;
	267	int ret;
	268
f7b41276 JH	269	ret = kstrtoul(buf, 10, &val);
	270	if (ret)
	271	return ret;
	272
	273	if (val > 2)
3cdbbeeb DM	274	return -EINVAL;
	275
	276	ret = isl29003_set_mode(client, val);
	277	if (ret < 0)
	278	return ret;
	279
	280	return count;
	281	}
	282
	283	static DEVICE_ATTR(mode, S_IWUSR \| S_IRUGO,
	284	isl29003_show_mode, isl29003_store_mode);
	285
	286
	287	/* power state */
	288	static ssize_t isl29003_show_power_state(struct device *dev,
	289	struct device_attribute *attr,
	290	char *buf)
	291	{
	292	struct i2c_client *client = to_i2c_client(dev);
05eec0c9	293
3cdbbeeb DM	294	return sprintf(buf, "%d\n", isl29003_get_power_state(client));
	295	}
	296
	297	static ssize_t isl29003_store_power_state(struct device *dev,
	298	struct device_attribute *attr,
	299	const char *buf, size_t count)
	300	{
	301	struct i2c_client *client = to_i2c_client(dev);
	302	unsigned long val;
	303	int ret;
	304
f7b41276 JH	305	ret = kstrtoul(buf, 10, &val);
	306	if (ret)
	307	return ret;
	308
	309	if (val > 1)
3cdbbeeb DM	310	return -EINVAL;
	311
	312	ret = isl29003_set_power_state(client, val);
	313	return ret ? ret : count;
	314	}
	315
	316	static DEVICE_ATTR(power_state, S_IWUSR \| S_IRUGO,
	317	isl29003_show_power_state, isl29003_store_power_state);
	318
	319
	320	/* lux */
	321	static ssize_t isl29003_show_lux(struct device *dev,
	322	struct device_attribute attr, char buf)
	323	{
	324	struct i2c_client *client = to_i2c_client(dev);
	325
	326	/* No LUX data if not operational */
	327	if (!isl29003_get_power_state(client))
	328	return -EBUSY;
	329
	330	return sprintf(buf, "%d\n", isl29003_get_adc_value(client));
	331	}
	332
	333	static DEVICE_ATTR(lux, S_IRUGO, isl29003_show_lux, NULL);
	334
	335	static struct attribute *isl29003_attributes[] = {
	336	&dev_attr_range.attr,
	337	&dev_attr_resolution.attr,
	338	&dev_attr_mode.attr,
	339	&dev_attr_power_state.attr,
	340	&dev_attr_lux.attr,
	341	NULL
	342	};
	343
	344	static const struct attribute_group isl29003_attr_group = {
	345	.attrs = isl29003_attributes,
	346	};
	347
	348	static int isl29003_init_client(struct i2c_client *client)
	349	{
	350	struct isl29003_data *data = i2c_get_clientdata(client);
	351	int i;
	352
	353	/* read all the registers once to fill the cache.
	354	* if one of the reads fails, we consider the init failed */
	355	for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) {
	356	int v = i2c_smbus_read_byte_data(client, i);
05eec0c9	357
3cdbbeeb DM	358	if (v < 0)
	359	return -ENODEV;
	360
	361	data->reg_cache[i] = v;
	362	}
	363
	364	/* set defaults */
	365	isl29003_set_range(client, 0);
	366	isl29003_set_resolution(client, 0);
	367	isl29003_set_mode(client, 0);
	368	isl29003_set_power_state(client, 0);
	369
	370	return 0;
	371	}
	372
	373	/*
	374	* I2C layer
	375	*/
	376
80c8ae28	377	static int isl29003_probe(struct i2c_client *client,
3cdbbeeb DM	378	const struct i2c_device_id *id)
3cdbbeeb DM	379	{
1a0911a0	380	struct i2c_adapter *adapter = client->adapter;
3cdbbeeb DM	381	struct isl29003_data *data;
	382	int err = 0;
	383
	384	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
	385	return -EIO;
	386
	387	data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL);
	388	if (!data)
	389	return -ENOMEM;
	390
	391	data->client = client;
	392	i2c_set_clientdata(client, data);
	393	mutex_init(&data->lock);
	394
	395	/* initialize the ISL29003 chip */
	396	err = isl29003_init_client(client);
	397	if (err)
	398	goto exit_kfree;
	399
	400	/* register sysfs hooks */
	401	err = sysfs_create_group(&client->dev.kobj, &isl29003_attr_group);
	402	if (err)
	403	goto exit_kfree;
	404
	405	dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION);
	406	return 0;
	407
	408	exit_kfree:
	409	kfree(data);
	410	return err;
	411	}
	412
486a5c28	413	static int isl29003_remove(struct i2c_client *client)
3cdbbeeb DM	414	{
	415	sysfs_remove_group(&client->dev.kobj, &isl29003_attr_group);
	416	isl29003_set_power_state(client, 0);
	417	kfree(i2c_get_clientdata(client));
	418	return 0;
	419	}
	420
873bf4f4 LPC	421	#ifdef CONFIG_PM_SLEEP
873bf4f4 LPC	422	static int isl29003_suspend(struct device *dev)
3cdbbeeb	423	{
873bf4f4	424	struct i2c_client *client = to_i2c_client(dev);
74614f8d DM	425	struct isl29003_data *data = i2c_get_clientdata(client);
	426
	427	data->power_state_before_suspend = isl29003_get_power_state(client);
3cdbbeeb DM	428	return isl29003_set_power_state(client, 0);
	429	}
	430
873bf4f4	431	static int isl29003_resume(struct device *dev)
3cdbbeeb DM	432	{
3cdbbeeb DM	433	int i;
873bf4f4	434	struct i2c_client *client = to_i2c_client(dev);
3cdbbeeb DM	435	struct isl29003_data *data = i2c_get_clientdata(client);
	436
	437	/* restore registers from cache */
	438	for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
74614f8d	439	if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
3cdbbeeb DM	440	return -EIO;
3cdbbeeb DM	441
74614f8d DM	442	return isl29003_set_power_state(client,
74614f8d DM	443	data->power_state_before_suspend);
3cdbbeeb DM	444	}
3cdbbeeb DM	445
873bf4f4 LPC	446	static SIMPLE_DEV_PM_OPS(isl29003_pm_ops, isl29003_suspend, isl29003_resume);
	447	#define ISL29003_PM_OPS (&isl29003_pm_ops)
	448
3cdbbeeb	449	#else
873bf4f4 LPC	450	#define ISL29003_PM_OPS NULL
873bf4f4 LPC	451	#endif /* CONFIG_PM_SLEEP */
3cdbbeeb DM	452
	453	static const struct i2c_device_id isl29003_id[] = {
	454	{ "isl29003", 0 },
	455	{}
	456	};
	457	MODULE_DEVICE_TABLE(i2c, isl29003_id);
	458
	459	static struct i2c_driver isl29003_driver = {
	460	.driver = {
	461	.name = ISL29003_DRV_NAME,
873bf4f4	462	.pm = ISL29003_PM_OPS,
3cdbbeeb	463	},
3cdbbeeb	464	.probe = isl29003_probe,
2d6bed9c	465	.remove = isl29003_remove,
3cdbbeeb DM	466	.id_table = isl29003_id,
	467	};
	468
a64fe2ed	469	module_i2c_driver(isl29003_driver);
3cdbbeeb DM	470
	471	MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
	472	MODULE_DESCRIPTION("ISL29003 ambient light sensor driver");
	473	MODULE_LICENSE("GPL v2");
	474	MODULE_VERSION(DRIVER_VERSION);