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