[linux-2.6-block.git] / drivers / misc / isl29020.c

/*
 * isl29020.c - Intersil  ALS Driver
 *
 * Copyright (C) 2008 Intel Corp
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * 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; version 2 of the License.
 *
 * 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.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/sysfs.h>
#include <linux/pm_runtime.h>

static DEFINE_MUTEX(mutex);

static ssize_t als_sensing_range_show(struct device *dev,
			struct device_attribute *attr,  char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	int  val;

	val = i2c_smbus_read_byte_data(client, 0x00);

	if (val < 0)
		return val;
	return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));

}

static ssize_t als_lux_input_data_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	int ret_val, val;
	unsigned long int lux;
	int temp;

	pm_runtime_get_sync(dev);
	msleep(100);

	mutex_lock(&mutex);
	temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
	if (temp < 0) {
		pm_runtime_put_sync(dev);
		mutex_unlock(&mutex);
		return temp;
	}

	ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
	mutex_unlock(&mutex);

	if (ret_val < 0) {
		pm_runtime_put_sync(dev);
		return ret_val;
	}

	ret_val |= temp << 8;
	val = i2c_smbus_read_byte_data(client, 0x00);
	pm_runtime_put_sync(dev);
	if (val < 0)
		return val;
	lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
	return sprintf(buf, "%ld\n", lux);
}

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

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

	if (val < 1 || val > 64000)
		return -EINVAL;

	/* Pick the smallest sensor range that will meet our requirements */
	if (val <= 1000)
		val = 1;
	else if (val <= 4000)
		val = 2;
	else if (val <= 16000)
		val = 3;
	else
		val = 4;

	ret_val = i2c_smbus_read_byte_data(client, 0x00);
	if (ret_val < 0)
		return ret_val;

	ret_val &= 0xFC; /*reset the bit before setting them */
	ret_val |= val - 1;
	ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);

	if (ret_val < 0)
		return ret_val;
	return count;
}

static void als_set_power_state(struct i2c_client *client, int enable)
{
	int ret_val;

	ret_val = i2c_smbus_read_byte_data(client, 0x00);
	if (ret_val < 0)
		return;

	if (enable)
		ret_val |= 0x80;
	else
		ret_val &= 0x7F;

	i2c_smbus_write_byte_data(client, 0x00, ret_val);
}

static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
	als_sensing_range_show, als_sensing_range_store);
static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);

static struct attribute *mid_att_als[] = {
	&dev_attr_lux0_sensor_range.attr,
	&dev_attr_lux0_input.attr,
	NULL
};

static struct attribute_group m_als_gr = {
	.name = "isl29020",
	.attrs = mid_att_als
};

static int als_set_default_config(struct i2c_client *client)
{
	int retval;

	retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
	if (retval < 0) {
		dev_err(&client->dev, "default write failed.");
		return retval;
	}
	return 0;
}

static int  isl29020_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	int res;

	res = als_set_default_config(client);
	if (res <  0)
		return res;

	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
	if (res) {
		dev_err(&client->dev, "isl29020: device create file failed\n");
		return res;
	}
	dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
	als_set_power_state(client, 0);
	pm_runtime_enable(&client->dev);
	return res;
}

static int isl29020_remove(struct i2c_client *client)
{
	sysfs_remove_group(&client->dev.kobj, &m_als_gr);
	return 0;
}

static struct i2c_device_id isl29020_id[] = {
	{ "isl29020", 0 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, isl29020_id);

#ifdef CONFIG_PM

static int isl29020_runtime_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	als_set_power_state(client, 0);
	return 0;
}

static int isl29020_runtime_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	als_set_power_state(client, 1);
	return 0;
}

static const struct dev_pm_ops isl29020_pm_ops = {
	.runtime_suspend = isl29020_runtime_suspend,
	.runtime_resume = isl29020_runtime_resume,
};

#define ISL29020_PM_OPS (&isl29020_pm_ops)
#else	/* CONFIG_PM */
#define ISL29020_PM_OPS NULL
#endif	/* CONFIG_PM */

static struct i2c_driver isl29020_driver = {
	.driver = {
		.name = "isl29020",
		.pm = ISL29020_PM_OPS,
	},
	.probe = isl29020_probe,
	.remove = isl29020_remove,
	.id_table = isl29020_id,
};

module_i2c_driver(isl29020_driver);

MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
2e85c4dd KT	1	/*
	2	* isl29020.c - Intersil ALS Driver
	3	*
	4	* Copyright (C) 2008 Intel Corp
	5	*
	6	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; version 2 of the License.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License along
	18	* with this program; if not, write to the Free Software Foundation, Inc.,
	19	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	20	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	21	*
	22	* Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
	23	*/
	24
	25	#include <linux/module.h>
2e85c4dd KT	26	#include <linux/slab.h>
	27	#include <linux/i2c.h>
	28	#include <linux/err.h>
	29	#include <linux/delay.h>
	30	#include <linux/sysfs.h>
	31	#include <linux/pm_runtime.h>
	32
	33	static DEFINE_MUTEX(mutex);
	34
	35	static ssize_t als_sensing_range_show(struct device *dev,
	36	struct device_attribute attr, char buf)
	37	{
	38	struct i2c_client *client = to_i2c_client(dev);
	39	int val;
	40
	41	val = i2c_smbus_read_byte_data(client, 0x00);
	42
	43	if (val < 0)
	44	return val;
	45	return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
	46
	47	}
	48
	49	static ssize_t als_lux_input_data_show(struct device *dev,
	50	struct device_attribute attr, char buf)
	51	{
	52	struct i2c_client *client = to_i2c_client(dev);
	53	int ret_val, val;
	54	unsigned long int lux;
	55	int temp;
	56
	57	pm_runtime_get_sync(dev);
	58	msleep(100);
	59
	60	mutex_lock(&mutex);
	61	temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
	62	if (temp < 0) {
	63	pm_runtime_put_sync(dev);
	64	mutex_unlock(&mutex);
	65	return temp;
	66	}
	67
	68	ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
	69	mutex_unlock(&mutex);
	70
	71	if (ret_val < 0) {
	72	pm_runtime_put_sync(dev);
	73	return ret_val;
	74	}
	75
	76	ret_val \|= temp << 8;
	77	val = i2c_smbus_read_byte_data(client, 0x00);
	78	pm_runtime_put_sync(dev);
	79	if (val < 0)
	80	return val;
	81	lux = ((((1 << (2 * (val & 3))))1000) ret_val) / 65536;
	82	return sprintf(buf, "%ld\n", lux);
	83	}
	84
	85	static ssize_t als_sensing_range_store(struct device *dev,
	86	struct device_attribute attr, const char buf, size_t count)
	87	{
	88	struct i2c_client *client = to_i2c_client(dev);
90482e45	89	int ret_val;
2e85c4dd KT	90	unsigned long val;
2e85c4dd KT	91
f7b41276 JH	92	ret_val = kstrtoul(buf, 10, &val);
	93	if (ret_val)
	94	return ret_val;
	95
2e85c4dd KT	96	if (val < 1 \|\| val > 64000)
	97	return -EINVAL;
	98
	99	/* Pick the smallest sensor range that will meet our requirements */
	100	if (val <= 1000)
	101	val = 1;
	102	else if (val <= 4000)
	103	val = 2;
	104	else if (val <= 16000)
	105	val = 3;
	106	else
	107	val = 4;
	108
	109	ret_val = i2c_smbus_read_byte_data(client, 0x00);
90482e45 DC	110	if (ret_val < 0)
90482e45 DC	111	return ret_val;
2e85c4dd KT	112
	113	ret_val &= 0xFC; /reset the bit before setting them /
	114	ret_val \|= val - 1;
	115	ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
	116
	117	if (ret_val < 0)
	118	return ret_val;
	119	return count;
	120	}
	121
	122	static void als_set_power_state(struct i2c_client *client, int enable)
	123	{
	124	int ret_val;
	125
	126	ret_val = i2c_smbus_read_byte_data(client, 0x00);
	127	if (ret_val < 0)
	128	return;
	129
	130	if (enable)
	131	ret_val \|= 0x80;
	132	else
	133	ret_val &= 0x7F;
	134
	135	i2c_smbus_write_byte_data(client, 0x00, ret_val);
	136	}
	137
	138	static DEVICE_ATTR(lux0_sensor_range, S_IRUGO \| S_IWUSR,
	139	als_sensing_range_show, als_sensing_range_store);
	140	static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
	141
	142	static struct attribute *mid_att_als[] = {
	143	&dev_attr_lux0_sensor_range.attr,
	144	&dev_attr_lux0_input.attr,
	145	NULL
	146	};
	147
	148	static struct attribute_group m_als_gr = {
	149	.name = "isl29020",
	150	.attrs = mid_att_als
	151	};
	152
	153	static int als_set_default_config(struct i2c_client *client)
	154	{
	155	int retval;
	156
	157	retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
	158	if (retval < 0) {
	159	dev_err(&client->dev, "default write failed.");
	160	return retval;
	161	}
2a5ac6f7	162	return 0;
2e85c4dd KT	163	}
	164
	165	static int isl29020_probe(struct i2c_client *client,
	166	const struct i2c_device_id *id)
	167	{
	168	int res;
	169
	170	res = als_set_default_config(client);
	171	if (res < 0)
	172	return res;
	173
	174	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
	175	if (res) {
	176	dev_err(&client->dev, "isl29020: device create file failed\n");
	177	return res;
	178	}
	179	dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
	180	als_set_power_state(client, 0);
	181	pm_runtime_enable(&client->dev);
	182	return res;
	183	}
	184
	185	static int isl29020_remove(struct i2c_client *client)
	186	{
2e85c4dd	187	sysfs_remove_group(&client->dev.kobj, &m_als_gr);
2e85c4dd KT	188	return 0;
	189	}
	190
	191	static struct i2c_device_id isl29020_id[] = {
	192	{ "isl29020", 0 },
	193	{ }
	194	};
	195
	196	MODULE_DEVICE_TABLE(i2c, isl29020_id);
	197
	198	#ifdef CONFIG_PM
	199
	200	static int isl29020_runtime_suspend(struct device *dev)
	201	{
	202	struct i2c_client *client = to_i2c_client(dev);
	203	als_set_power_state(client, 0);
	204	return 0;
	205	}
	206
	207	static int isl29020_runtime_resume(struct device *dev)
	208	{
	209	struct i2c_client *client = to_i2c_client(dev);
	210	als_set_power_state(client, 1);
	211	return 0;
	212	}
	213
	214	static const struct dev_pm_ops isl29020_pm_ops = {
	215	.runtime_suspend = isl29020_runtime_suspend,
	216	.runtime_resume = isl29020_runtime_resume,
	217	};
	218
	219	#define ISL29020_PM_OPS (&isl29020_pm_ops)
	220	#else /* CONFIG_PM */
	221	#define ISL29020_PM_OPS NULL
	222	#endif /* CONFIG_PM */
	223
	224	static struct i2c_driver isl29020_driver = {
	225	.driver = {
	226	.name = "isl29020",
	227	.pm = ISL29020_PM_OPS,
	228	},
	229	.probe = isl29020_probe,
	230	.remove = isl29020_remove,
	231	.id_table = isl29020_id,
	232	};
	233
a64fe2ed	234	module_i2c_driver(isl29020_driver);
2e85c4dd	235
b38eeaae	236	MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
2e85c4dd KT	237	MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
2e85c4dd KT	238	MODULE_LICENSE("GPL v2");