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

/*
 *  isl29003.c - Linux kernel module for
 * 	Intersil ISL29003 ambient light sensor
 *
 *  See file:Documentation/misc-devices/isl29003
 *
 *  Copyright (c) 2009 Daniel Mack <[email protected]>
 *
 *  Based on code written by
 *  	Rodolfo Giometti <[email protected]>
 *  	Eurotech S.p.A. <[email protected]>
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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_RES_MASK, ISL29003_RES_SHIFT);
}

static int isl29003_set_mode(struct i2c_client *client, int mode)
{
	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
		ISL29003_RES_MASK, ISL29003_RES_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 = to_i2c_adapter(client->dev.parent);
	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 <[email protected]>");
MODULE_DESCRIPTION("ISL29003 ambient light sensor driver");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRIVER_VERSION);
Commit	Line	Data
3cdbbeeb DM	1	/*
	2	* isl29003.c - Linux kernel module for
	3	* Intersil ISL29003 ambient light sensor
	4	*
	5	* See file:Documentation/misc-devices/isl29003
	6	*
	7	* Copyright (c) 2009 Daniel Mack <[email protected]>
	8	*
	9	* Based on code written by
	10	* Rodolfo Giometti <[email protected]>
	11	* Eurotech S.p.A. <[email protected]>
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	26	*/
	27
	28	#include <linux/module.h>
3cdbbeeb DM	29	#include <linux/slab.h>
	30	#include <linux/i2c.h>
	31	#include <linux/mutex.h>
	32	#include <linux/delay.h>
	33
	34	#define ISL29003_DRV_NAME "isl29003"
	35	#define DRIVER_VERSION "1.0"
	36
	37	#define ISL29003_REG_COMMAND 0x00
	38	#define ISL29003_ADC_ENABLED (1 << 7)
	39	#define ISL29003_ADC_PD (1 << 6)
	40	#define ISL29003_TIMING_INT (1 << 5)
	41	#define ISL29003_MODE_SHIFT (2)
	42	#define ISL29003_MODE_MASK (0x3 << ISL29003_MODE_SHIFT)
	43	#define ISL29003_RES_SHIFT (0)
	44	#define ISL29003_RES_MASK (0x3 << ISL29003_RES_SHIFT)
	45
	46	#define ISL29003_REG_CONTROL 0x01
	47	#define ISL29003_INT_FLG (1 << 5)
	48	#define ISL29003_RANGE_SHIFT (2)
	49	#define ISL29003_RANGE_MASK (0x3 << ISL29003_RANGE_SHIFT)
	50	#define ISL29003_INT_PERSISTS_SHIFT (0)
	51	#define ISL29003_INT_PERSISTS_MASK (0xf << ISL29003_INT_PERSISTS_SHIFT)
	52
	53	#define ISL29003_REG_IRQ_THRESH_HI 0x02
	54	#define ISL29003_REG_IRQ_THRESH_LO 0x03
	55	#define ISL29003_REG_LSB_SENSOR 0x04
	56	#define ISL29003_REG_MSB_SENSOR 0x05
	57	#define ISL29003_REG_LSB_TIMER 0x06
	58	#define ISL29003_REG_MSB_TIMER 0x07
	59
	60	#define ISL29003_NUM_CACHABLE_REGS 4
	61
	62	struct isl29003_data {
	63	struct i2c_client *client;
	64	struct mutex lock;
	65	u8 reg_cache[ISL29003_NUM_CACHABLE_REGS];
74614f8d	66	u8 power_state_before_suspend;
3cdbbeeb DM	67	};
	68
	69	static int gain_range[] = {
	70	1000, 4000, 16000, 64000
	71	};
	72
	73	/*
	74	* register access helpers
	75	*/
	76
	77	static int __isl29003_read_reg(struct i2c_client *client,
	78	u32 reg, u8 mask, u8 shift)
	79	{
	80	struct isl29003_data *data = i2c_get_clientdata(client);
	81	return (data->reg_cache[reg] & mask) >> shift;
	82	}
	83
	84	static int __isl29003_write_reg(struct i2c_client *client,
	85	u32 reg, u8 mask, u8 shift, u8 val)
	86	{
	87	struct isl29003_data *data = i2c_get_clientdata(client);
	88	int ret = 0;
	89	u8 tmp;
	90
	91	if (reg >= ISL29003_NUM_CACHABLE_REGS)
	92	return -EINVAL;
	93
	94	mutex_lock(&data->lock);
	95
	96	tmp = data->reg_cache[reg];
	97	tmp &= ~mask;
	98	tmp \|= val << shift;
	99
	100	ret = i2c_smbus_write_byte_data(client, reg, tmp);
	101	if (!ret)
	102	data->reg_cache[reg] = tmp;
	103
	104	mutex_unlock(&data->lock);
	105	return ret;
	106	}
	107
	108	/*
	109	* internally used functions
	110	*/
	111
	112	/* range */
	113	static int isl29003_get_range(struct i2c_client *client)
	114	{
	115	return __isl29003_read_reg(client, ISL29003_REG_CONTROL,
	116	ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT);
	117	}
	118
	119	static int isl29003_set_range(struct i2c_client *client, int range)
	120	{
	121	return __isl29003_write_reg(client, ISL29003_REG_CONTROL,
	122	ISL29003_RANGE_MASK, ISL29003_RANGE_SHIFT, range);
	123	}
	124
	125	/* resolution */
	126	static int isl29003_get_resolution(struct i2c_client *client)
	127	{
	128	return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
	129	ISL29003_RES_MASK, ISL29003_RES_SHIFT);
	130	}
131
132	static int isl29003_set_resolution(struct i2c_client *client, int res)
133	{
134	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
135	ISL29003_RES_MASK, ISL29003_RES_SHIFT, res);
136	}
137
138	/* mode */
139	static int isl29003_get_mode(struct i2c_client *client)
140	{
141	return __isl29003_read_reg(client, ISL29003_REG_COMMAND,
142	ISL29003_RES_MASK, ISL29003_RES_SHIFT);
143	}
144
145	static int isl29003_set_mode(struct i2c_client *client, int mode)
146	{
147	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
148	ISL29003_RES_MASK, ISL29003_RES_SHIFT, mode);
149	}
150
151	/* power_state */
152	static int isl29003_set_power_state(struct i2c_client *client, int state)
153	{
154	return __isl29003_write_reg(client, ISL29003_REG_COMMAND,
155	ISL29003_ADC_ENABLED \| ISL29003_ADC_PD, 0,
156	state ? ISL29003_ADC_ENABLED : ISL29003_ADC_PD);
157	}
158
159	static int isl29003_get_power_state(struct i2c_client *client)
160	{
161	struct isl29003_data *data = i2c_get_clientdata(client);
162	u8 cmdreg = data->reg_cache[ISL29003_REG_COMMAND];
163	return ~cmdreg & ISL29003_ADC_PD;
164	}
165
166	static int isl29003_get_adc_value(struct i2c_client *client)
167	{
168	struct isl29003_data *data = i2c_get_clientdata(client);
169	int lsb, msb, range, bitdepth;
170
171	mutex_lock(&data->lock);
172	lsb = i2c_smbus_read_byte_data(client, ISL29003_REG_LSB_SENSOR);
173
174	if (lsb < 0) {
175	mutex_unlock(&data->lock);
176	return lsb;
177	}
178
179	msb = i2c_smbus_read_byte_data(client, ISL29003_REG_MSB_SENSOR);
180	mutex_unlock(&data->lock);
181
182	if (msb < 0)
183	return msb;
184
185	range = isl29003_get_range(client);
186	bitdepth = (4 - isl29003_get_resolution(client)) * 4;
187	return (((msb << 8) \| lsb) * gain_range[range]) >> bitdepth;
188	}
189
190	/*
191	* sysfs layer
192	*/
193
194	/* range */
195	static ssize_t isl29003_show_range(struct device *dev,
196	struct device_attribute attr, char buf)
197	{
198	struct i2c_client *client = to_i2c_client(dev);
199	return sprintf(buf, "%i\n", isl29003_get_range(client));
200	}
201
202	static ssize_t isl29003_store_range(struct device *dev,
203	struct device_attribute *attr,
204	const char *buf, size_t count)
205	{
206	struct i2c_client *client = to_i2c_client(dev);
207	unsigned long val;
208	int ret;
209
f7b41276 JH	210	ret = kstrtoul(buf, 10, &val);
	211	if (ret)
	212	return ret;
	213
	214	if (val > 3)
3cdbbeeb DM	215	return -EINVAL;
	216
	217	ret = isl29003_set_range(client, val);
	218	if (ret < 0)
	219	return ret;
	220
	221	return count;
	222	}
	223
	224	static DEVICE_ATTR(range, S_IWUSR \| S_IRUGO,
	225	isl29003_show_range, isl29003_store_range);
	226
	227
	228	/* resolution */
	229	static ssize_t isl29003_show_resolution(struct device *dev,
	230	struct device_attribute *attr,
	231	char *buf)
	232	{
	233	struct i2c_client *client = to_i2c_client(dev);
	234	return sprintf(buf, "%d\n", isl29003_get_resolution(client));
	235	}
	236
	237	static ssize_t isl29003_store_resolution(struct device *dev,
	238	struct device_attribute *attr,
	239	const char *buf, size_t count)
	240	{
	241	struct i2c_client *client = to_i2c_client(dev);
	242	unsigned long val;
	243	int ret;
	244
f7b41276 JH	245	ret = kstrtoul(buf, 10, &val);
	246	if (ret)
	247	return ret;
	248
	249	if (val > 3)
3cdbbeeb DM	250	return -EINVAL;
	251
	252	ret = isl29003_set_resolution(client, val);
	253	if (ret < 0)
	254	return ret;
	255
	256	return count;
	257	}
	258
	259	static DEVICE_ATTR(resolution, S_IWUSR \| S_IRUGO,
	260	isl29003_show_resolution, isl29003_store_resolution);
	261
	262	/* mode */
	263	static ssize_t isl29003_show_mode(struct device *dev,
	264	struct device_attribute attr, char buf)
	265	{
	266	struct i2c_client *client = to_i2c_client(dev);
	267	return sprintf(buf, "%d\n", isl29003_get_mode(client));
	268	}
	269
	270	static ssize_t isl29003_store_mode(struct device *dev,
	271	struct device_attribute attr, const char buf, size_t count)
	272	{
	273	struct i2c_client *client = to_i2c_client(dev);
	274	unsigned long val;
	275	int ret;
	276
f7b41276 JH	277	ret = kstrtoul(buf, 10, &val);
	278	if (ret)
	279	return ret;
	280
	281	if (val > 2)
3cdbbeeb DM	282	return -EINVAL;
	283
	284	ret = isl29003_set_mode(client, val);
	285	if (ret < 0)
	286	return ret;
	287
	288	return count;
	289	}
	290
	291	static DEVICE_ATTR(mode, S_IWUSR \| S_IRUGO,
	292	isl29003_show_mode, isl29003_store_mode);
	293
	294
	295	/* power state */
	296	static ssize_t isl29003_show_power_state(struct device *dev,
	297	struct device_attribute *attr,
	298	char *buf)
	299	{
	300	struct i2c_client *client = to_i2c_client(dev);
	301	return sprintf(buf, "%d\n", isl29003_get_power_state(client));
	302	}
	303
	304	static ssize_t isl29003_store_power_state(struct device *dev,
	305	struct device_attribute *attr,
	306	const char *buf, size_t count)
	307	{
	308	struct i2c_client *client = to_i2c_client(dev);
	309	unsigned long val;
	310	int ret;
	311
f7b41276 JH	312	ret = kstrtoul(buf, 10, &val);
	313	if (ret)
	314	return ret;
	315
	316	if (val > 1)
3cdbbeeb DM	317	return -EINVAL;
	318
	319	ret = isl29003_set_power_state(client, val);
	320	return ret ? ret : count;
	321	}
	322
	323	static DEVICE_ATTR(power_state, S_IWUSR \| S_IRUGO,
	324	isl29003_show_power_state, isl29003_store_power_state);
	325
	326
	327	/* lux */
	328	static ssize_t isl29003_show_lux(struct device *dev,
	329	struct device_attribute attr, char buf)
	330	{
	331	struct i2c_client *client = to_i2c_client(dev);
	332
	333	/* No LUX data if not operational */
	334	if (!isl29003_get_power_state(client))
	335	return -EBUSY;
	336
	337	return sprintf(buf, "%d\n", isl29003_get_adc_value(client));
	338	}
	339
	340	static DEVICE_ATTR(lux, S_IRUGO, isl29003_show_lux, NULL);
	341
	342	static struct attribute *isl29003_attributes[] = {
	343	&dev_attr_range.attr,
	344	&dev_attr_resolution.attr,
	345	&dev_attr_mode.attr,
	346	&dev_attr_power_state.attr,
	347	&dev_attr_lux.attr,
	348	NULL
	349	};
	350
	351	static const struct attribute_group isl29003_attr_group = {
	352	.attrs = isl29003_attributes,
	353	};
	354
	355	static int isl29003_init_client(struct i2c_client *client)
	356	{
	357	struct isl29003_data *data = i2c_get_clientdata(client);
	358	int i;
	359
	360	/* read all the registers once to fill the cache.
	361	* if one of the reads fails, we consider the init failed */
	362	for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) {
	363	int v = i2c_smbus_read_byte_data(client, i);
	364	if (v < 0)
	365	return -ENODEV;
	366
	367	data->reg_cache[i] = v;
	368	}
	369
	370	/* set defaults */
	371	isl29003_set_range(client, 0);
	372	isl29003_set_resolution(client, 0);
	373	isl29003_set_mode(client, 0);
	374	isl29003_set_power_state(client, 0);
	375
	376	return 0;
	377	}
	378
	379	/*
	380	* I2C layer
381	*/
382
80c8ae28	383	static int isl29003_probe(struct i2c_client *client,
3cdbbeeb DM	384	const struct i2c_device_id *id)
	385	{
	386	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	387	struct isl29003_data *data;
	388	int err = 0;
	389
	390	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
	391	return -EIO;
	392
	393	data = kzalloc(sizeof(struct isl29003_data), GFP_KERNEL);
	394	if (!data)
	395	return -ENOMEM;
	396
	397	data->client = client;
	398	i2c_set_clientdata(client, data);
	399	mutex_init(&data->lock);
	400
	401	/* initialize the ISL29003 chip */
	402	err = isl29003_init_client(client);
	403	if (err)
	404	goto exit_kfree;
	405
	406	/* register sysfs hooks */
	407	err = sysfs_create_group(&client->dev.kobj, &isl29003_attr_group);
	408	if (err)
	409	goto exit_kfree;
	410
	411	dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION);
	412	return 0;
	413
	414	exit_kfree:
	415	kfree(data);
	416	return err;
	417	}
	418
486a5c28	419	static int isl29003_remove(struct i2c_client *client)
3cdbbeeb DM	420	{
	421	sysfs_remove_group(&client->dev.kobj, &isl29003_attr_group);
	422	isl29003_set_power_state(client, 0);
	423	kfree(i2c_get_clientdata(client));
	424	return 0;
	425	}
	426
873bf4f4 LPC	427	#ifdef CONFIG_PM_SLEEP
873bf4f4 LPC	428	static int isl29003_suspend(struct device *dev)
3cdbbeeb	429	{
873bf4f4	430	struct i2c_client *client = to_i2c_client(dev);
74614f8d DM	431	struct isl29003_data *data = i2c_get_clientdata(client);
	432
	433	data->power_state_before_suspend = isl29003_get_power_state(client);
3cdbbeeb DM	434	return isl29003_set_power_state(client, 0);
	435	}
	436
873bf4f4	437	static int isl29003_resume(struct device *dev)
3cdbbeeb DM	438	{
3cdbbeeb DM	439	int i;
873bf4f4	440	struct i2c_client *client = to_i2c_client(dev);
3cdbbeeb DM	441	struct isl29003_data *data = i2c_get_clientdata(client);
	442
	443	/* restore registers from cache */
	444	for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
74614f8d	445	if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
3cdbbeeb DM	446	return -EIO;
3cdbbeeb DM	447
74614f8d DM	448	return isl29003_set_power_state(client,
74614f8d DM	449	data->power_state_before_suspend);
3cdbbeeb DM	450	}
3cdbbeeb DM	451
873bf4f4 LPC	452	static SIMPLE_DEV_PM_OPS(isl29003_pm_ops, isl29003_suspend, isl29003_resume);
	453	#define ISL29003_PM_OPS (&isl29003_pm_ops)
	454
3cdbbeeb	455	#else
873bf4f4 LPC	456	#define ISL29003_PM_OPS NULL
873bf4f4 LPC	457	#endif /* CONFIG_PM_SLEEP */
3cdbbeeb DM	458
	459	static const struct i2c_device_id isl29003_id[] = {
	460	{ "isl29003", 0 },
	461	{}
	462	};
	463	MODULE_DEVICE_TABLE(i2c, isl29003_id);
	464
	465	static struct i2c_driver isl29003_driver = {
	466	.driver = {
	467	.name = ISL29003_DRV_NAME,
873bf4f4	468	.pm = ISL29003_PM_OPS,
3cdbbeeb	469	},
3cdbbeeb	470	.probe = isl29003_probe,
2d6bed9c	471	.remove = isl29003_remove,
3cdbbeeb DM	472	.id_table = isl29003_id,
	473	};
	474
a64fe2ed	475	module_i2c_driver(isl29003_driver);
3cdbbeeb DM	476
	477	MODULE_AUTHOR("Daniel Mack <[email protected]>");
	478	MODULE_DESCRIPTION("ISL29003 ambient light sensor driver");
	479	MODULE_LICENSE("GPL v2");
	480	MODULE_VERSION(DRIVER_VERSION);