[net-next-2.6.git] / drivers / misc / apds9802als.c

/*
 * apds9802als.c - apds9802  ALS Driver
 *
 * Copyright (C) 2009 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.
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 */

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

#define ALS_MIN_RANGE_VAL 1
#define ALS_MAX_RANGE_VAL 2
#define POWER_STA_ENABLE 1
#define POWER_STA_DISABLE 0

#define DRIVER_NAME "apds9802als"

struct als_data {
	struct 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, 0x81);
	if (val < 0)
		return val;
	if (val & 1)
		return sprintf(buf, "4095\n");
	else
		return sprintf(buf, "65535\n");
}

static int als_wait_for_data_ready(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	int ret;
	int retry = 10;

	do {
		msleep(30);
		ret = i2c_smbus_read_byte_data(client, 0x86);
	} while (!(ret & 0x80) && retry--);

	if (!retry) {
		dev_warn(dev, "timeout waiting for data ready\n");
		return -ETIMEDOUT;
	}

	return 0;
}

static ssize_t als_lux0_input_data_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct als_data *data = i2c_get_clientdata(client);
	int ret_val;
	int temp;

	/* Protect against parallel reads */
	pm_runtime_get_sync(dev);
	mutex_lock(&data->mutex);

	/* clear EOC interrupt status */
	i2c_smbus_write_byte(client, 0x40);
	/* start measurement */
	temp = i2c_smbus_read_byte_data(client, 0x81);
	i2c_smbus_write_byte_data(client, 0x81, temp | 0x08);

	ret_val = als_wait_for_data_ready(dev);
	if (ret_val < 0)
		goto failed;

	temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */
	if (temp < 0) {
		ret_val = temp;
		goto failed;
	}
	ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */
	if (ret_val < 0)
		goto failed;

	mutex_unlock(&data->mutex);
	pm_runtime_put_sync(dev);

	temp = (ret_val << 8) | temp;
	return sprintf(buf, "%d\n", temp);
failed:
	mutex_unlock(&data->mutex);
	pm_runtime_put_sync(dev);
	return ret_val;
}

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);
	struct als_data *data = i2c_get_clientdata(client);
	int ret_val;
	unsigned long val;

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

	if (val < 4096)
		val = 1;
	else if (val < 65536)
		val = 2;
	else
		return -ERANGE;

	pm_runtime_get_sync(dev);

	/* Make sure nobody else reads/modifies/writes 0x81 while we
	   are active */
	mutex_lock(&data->mutex);

	ret_val = i2c_smbus_read_byte_data(client, 0x81);
	if (ret_val < 0)
		goto fail;

	/* Reset the bits before setting them */
	ret_val = ret_val & 0xFA;

	if (val == 1) /* Setting detection range up to 4k LUX */
		ret_val = (ret_val | 0x01);
	else /* Setting detection range up to 64k LUX*/
		ret_val = (ret_val | 0x00);

	ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);

	if (ret_val >= 0) {
		/* All OK */
		mutex_unlock(&data->mutex);
		pm_runtime_put_sync(dev);
		return count;
	}
fail:
	mutex_unlock(&data->mutex);
	pm_runtime_put_sync(dev);
	return ret_val;
}

static int als_set_power_state(struct i2c_client *client, bool on_off)
{
	int ret_val;
	struct als_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->mutex);
	ret_val = i2c_smbus_read_byte_data(client, 0x80);
	if (ret_val < 0)
		goto fail;
	if (on_off)
		ret_val = ret_val | 0x01;
	else
		ret_val = ret_val & 0xFE;
	ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val);
fail:
	mutex_unlock(&data->mutex);
	return 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_lux0_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 = "apds9802als",
	.attrs = mid_att_als
};

static int als_set_default_config(struct i2c_client *client)
{
	int ret_val;
	/* Write the command and then switch on */
	ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01);
	if (ret_val < 0) {
		dev_err(&client->dev, "failed default switch on write\n");
		return ret_val;
	}
	/* detection range: 1~64K Lux, maunal measurement */
	ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08);
	if (ret_val < 0)
		dev_err(&client->dev, "failed default LUX on write\n");

	/*  We always get 0 for the 1st measurement after system power on,
	 *  so make sure it is finished before user asks for data.
	 */
	als_wait_for_data_ready(&client->dev);

	return ret_val;
}

static int apds9802als_probe(struct i2c_client *client,
			     const struct i2c_device_id *id)
{
	int res;
	struct als_data *data;

	data = kzalloc(sizeof(struct als_data), GFP_KERNEL);
	if (data == NULL) {
		dev_err(&client->dev, "Memory allocation failed\n");
		return -ENOMEM;
	}
	i2c_set_clientdata(client, data);
	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
	if (res) {
		dev_err(&client->dev, "device create file failed\n");
		goto als_error1;
	}
	dev_info(&client->dev, "ALS chip found\n");
	als_set_default_config(client);
	mutex_init(&data->mutex);

	pm_runtime_enable(&client->dev);
	pm_runtime_get(&client->dev);
	pm_runtime_put(&client->dev);

	return res;
als_error1:
	i2c_set_clientdata(client, NULL);
	kfree(data);
	return res;
}

static int apds9802als_remove(struct i2c_client *client)
{
	struct als_data *data = i2c_get_clientdata(client);

	als_set_power_state(client, false);
	sysfs_remove_group(&client->dev.kobj, &m_als_gr);
	kfree(data);
	return 0;
}

#ifdef CONFIG_PM
static int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg)
{
	als_set_power_state(client, false);
	return 0;
}

static int apds9802als_resume(struct i2c_client *client)
{
	als_set_default_config(client);

	pm_runtime_get(&client->dev);
	pm_runtime_put(&client->dev);
	return 0;
}

static int apds9802als_runtime_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	als_set_power_state(client, false);
	return 0;
}

static int apds9802als_runtime_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	als_set_power_state(client, true);
	return 0;
}

static const struct dev_pm_ops apds9802als_pm_ops = {
	.runtime_suspend = apds9802als_runtime_suspend,
	.runtime_resume = apds9802als_runtime_resume,
};

#define APDS9802ALS_PM_OPS (&apds9802als_pm_ops)

#else	/* CONFIG_PM */
#define apds9802als_suspend NULL
#define apds9802als_resume NULL
#define APDS9802ALS_PM_OPS NULL
#endif	/* CONFIG_PM */

static struct i2c_device_id apds9802als_id[] = {
	{ DRIVER_NAME, 0 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, apds9802als_id);

static struct i2c_driver apds9802als_driver = {
	.driver = {
		.name = DRIVER_NAME,
		.pm = APDS9802ALS_PM_OPS,
	},
	.probe = apds9802als_probe,
	.remove = apds9802als_remove,
	.suspend = apds9802als_suspend,
	.resume = apds9802als_resume,
	.id_table = apds9802als_id,
};

static int __init sensor_apds9802als_init(void)
{
	return i2c_add_driver(&apds9802als_driver);
}

static void  __exit sensor_apds9802als_exit(void)
{
	i2c_del_driver(&apds9802als_driver);
}
module_init(sensor_apds9802als_init);
module_exit(sensor_apds9802als_exit);

MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
MODULE_DESCRIPTION("Avago apds9802als ALS Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
22d96aa5	1	/*
	2	* apds9802als.c - apds9802 ALS Driver
	3	*
	4	* Copyright (C) 2009 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	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/init.h>
	26	#include <linux/slab.h>
	27	#include <linux/i2c.h>
	28	#include <linux/err.h>
	29	#include <linux/delay.h>
	30	#include <linux/mutex.h>
	31	#include <linux/sysfs.h>
f0cfec11	32	#include <linux/pm_runtime.h>
22d96aa5	33
	34	#define ALS_MIN_RANGE_VAL 1
	35	#define ALS_MAX_RANGE_VAL 2
	36	#define POWER_STA_ENABLE 1
	37	#define POWER_STA_DISABLE 0
22d96aa5	38
	39	#define DRIVER_NAME "apds9802als"
	40
	41	struct als_data {
22d96aa5	42	struct mutex mutex;
	43	};
	44
	45	static ssize_t als_sensing_range_show(struct device *dev,
	46	struct device_attribute attr, char buf)
	47	{
	48	struct i2c_client *client = to_i2c_client(dev);
	49	int val;
	50
	51	val = i2c_smbus_read_byte_data(client, 0x81);
	52	if (val < 0)
	53	return val;
	54	if (val & 1)
	55	return sprintf(buf, "4095\n");
	56	else
	57	return sprintf(buf, "65535\n");
	58	}
	59
f0cfec11 HL	60	static int als_wait_for_data_ready(struct device *dev)
	61	{
	62	struct i2c_client *client = to_i2c_client(dev);
	63	int ret;
	64	int retry = 10;
	65
	66	do {
	67	msleep(30);
	68	ret = i2c_smbus_read_byte_data(client, 0x86);
	69	} while (!(ret & 0x80) && retry--);
	70
	71	if (!retry) {
	72	dev_warn(dev, "timeout waiting for data ready\n");
	73	return -ETIMEDOUT;
	74	}
	75
	76	return 0;
	77	}
	78
22d96aa5	79	static ssize_t als_lux0_input_data_show(struct device *dev,
	80	struct device_attribute attr, char buf)
	81	{
	82	struct i2c_client *client = to_i2c_client(dev);
	83	struct als_data *data = i2c_get_clientdata(client);
f0cfec11	84	int ret_val;
22d96aa5	85	int temp;
	86
	87	/* Protect against parallel reads */
f0cfec11	88	pm_runtime_get_sync(dev);
22d96aa5	89	mutex_lock(&data->mutex);
f0cfec11 HL	90
	91	/* clear EOC interrupt status */
	92	i2c_smbus_write_byte(client, 0x40);
	93	/* start measurement */
	94	temp = i2c_smbus_read_byte_data(client, 0x81);
	95	i2c_smbus_write_byte_data(client, 0x81, temp \| 0x08);
	96
	97	ret_val = als_wait_for_data_ready(dev);
	98	if (ret_val < 0)
	99	goto failed;
	100
	101	temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */
22d96aa5	102	if (temp < 0) {
	103	ret_val = temp;
	104	goto failed;
	105	}
f0cfec11	106	ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */
22d96aa5	107	if (ret_val < 0)
22d96aa5	108	goto failed;
f0cfec11	109
22d96aa5	110	mutex_unlock(&data->mutex);
f0cfec11 HL	111	pm_runtime_put_sync(dev);
	112
	113	temp = (ret_val << 8) \| temp;
	114	return sprintf(buf, "%d\n", temp);
22d96aa5	115	failed:
22d96aa5	116	mutex_unlock(&data->mutex);
f0cfec11	117	pm_runtime_put_sync(dev);
22d96aa5	118	return ret_val;
	119	}
	120
	121	static ssize_t als_sensing_range_store(struct device *dev,
	122	struct device_attribute attr, const char buf, size_t count)
	123	{
	124	struct i2c_client *client = to_i2c_client(dev);
	125	struct als_data *data = i2c_get_clientdata(client);
1093736b	126	int ret_val;
22d96aa5	127	unsigned long val;
	128
	129	if (strict_strtoul(buf, 10, &val))
	130	return -EINVAL;
	131
	132	if (val < 4096)
	133	val = 1;
	134	else if (val < 65536)
	135	val = 2;
	136	else
	137	return -ERANGE;
	138
f0cfec11 HL	139	pm_runtime_get_sync(dev);
f0cfec11 HL	140
22d96aa5	141	/* Make sure nobody else reads/modifies/writes 0x81 while we
22d96aa5	142	are active */
22d96aa5	143	mutex_lock(&data->mutex);
	144
	145	ret_val = i2c_smbus_read_byte_data(client, 0x81);
	146	if (ret_val < 0)
	147	goto fail;
	148
	149	/* Reset the bits before setting them */
	150	ret_val = ret_val & 0xFA;
	151
f0cfec11 HL	152	if (val == 1) /* Setting detection range up to 4k LUX */
	153	ret_val = (ret_val \| 0x01);
	154	else /* Setting detection range up to 64k LUX*/
	155	ret_val = (ret_val \| 0x00);
22d96aa5	156
22d96aa5	157	ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);
f0cfec11	158
22d96aa5	159	if (ret_val >= 0) {
	160	/* All OK */
	161	mutex_unlock(&data->mutex);
f0cfec11	162	pm_runtime_put_sync(dev);
22d96aa5	163	return count;
	164	}
	165	fail:
	166	mutex_unlock(&data->mutex);
f0cfec11	167	pm_runtime_put_sync(dev);
22d96aa5	168	return ret_val;
	169	}
	170
22d96aa5	171	static int als_set_power_state(struct i2c_client *client, bool on_off)
	172	{
	173	int ret_val;
	174	struct als_data *data = i2c_get_clientdata(client);
	175
	176	mutex_lock(&data->mutex);
	177	ret_val = i2c_smbus_read_byte_data(client, 0x80);
	178	if (ret_val < 0)
	179	goto fail;
	180	if (on_off)
	181	ret_val = ret_val \| 0x01;
	182	else
	183	ret_val = ret_val & 0xFE;
	184	ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val);
	185	fail:
	186	mutex_unlock(&data->mutex);
	187	return ret_val;
	188	}
	189
22d96aa5	190	static DEVICE_ATTR(lux0_sensor_range, S_IRUGO \| S_IWUSR,
	191	als_sensing_range_show, als_sensing_range_store);
	192	static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux0_input_data_show, NULL);
22d96aa5	193
	194	static struct attribute *mid_att_als[] = {
	195	&dev_attr_lux0_sensor_range.attr,
	196	&dev_attr_lux0_input.attr,
22d96aa5	197	NULL
	198	};
	199
	200	static struct attribute_group m_als_gr = {
	201	.name = "apds9802als",
	202	.attrs = mid_att_als
	203	};
	204
	205	static int als_set_default_config(struct i2c_client *client)
	206	{
	207	int ret_val;
	208	/* Write the command and then switch on */
	209	ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01);
	210	if (ret_val < 0) {
	211	dev_err(&client->dev, "failed default switch on write\n");
	212	return ret_val;
	213	}
f0cfec11 HL	214	/* detection range: 1~64K Lux, maunal measurement */
f0cfec11 HL	215	ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08);
22d96aa5	216	if (ret_val < 0)
22d96aa5	217	dev_err(&client->dev, "failed default LUX on write\n");
f0cfec11 HL	218
	219	/* We always get 0 for the 1st measurement after system power on,
	220	* so make sure it is finished before user asks for data.
	221	*/
	222	als_wait_for_data_ready(&client->dev);
	223
22d96aa5	224	return ret_val;
	225	}
	226
f0cfec11 HL	227	static int apds9802als_probe(struct i2c_client *client,
f0cfec11 HL	228	const struct i2c_device_id *id)
22d96aa5	229	{
	230	int res;
	231	struct als_data *data;
	232
	233	data = kzalloc(sizeof(struct als_data), GFP_KERNEL);
	234	if (data == NULL) {
	235	dev_err(&client->dev, "Memory allocation failed\n");
	236	return -ENOMEM;
	237	}
	238	i2c_set_clientdata(client, data);
	239	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
	240	if (res) {
	241	dev_err(&client->dev, "device create file failed\n");
	242	goto als_error1;
	243	}
f0cfec11	244	dev_info(&client->dev, "ALS chip found\n");
22d96aa5	245	als_set_default_config(client);
22d96aa5	246	mutex_init(&data->mutex);
f0cfec11 HL	247
	248	pm_runtime_enable(&client->dev);
	249	pm_runtime_get(&client->dev);
	250	pm_runtime_put(&client->dev);
	251
22d96aa5	252	return res;
	253	als_error1:
	254	i2c_set_clientdata(client, NULL);
	255	kfree(data);
	256	return res;
	257	}
	258
	259	static int apds9802als_remove(struct i2c_client *client)
	260	{
	261	struct als_data *data = i2c_get_clientdata(client);
f0cfec11 HL	262
f0cfec11 HL	263	als_set_power_state(client, false);
22d96aa5	264	sysfs_remove_group(&client->dev.kobj, &m_als_gr);
	265	kfree(data);
	266	return 0;
	267	}
	268
f0cfec11	269	#ifdef CONFIG_PM
22d96aa5	270	static int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg)
	271	{
	272	als_set_power_state(client, false);
	273	return 0;
	274	}
	275
	276	static int apds9802als_resume(struct i2c_client *client)
	277	{
f0cfec11	278	als_set_default_config(client);
22d96aa5	279
f0cfec11 HL	280	pm_runtime_get(&client->dev);
f0cfec11 HL	281	pm_runtime_put(&client->dev);
22d96aa5	282	return 0;
	283	}
	284
f0cfec11 HL	285	static int apds9802als_runtime_suspend(struct device *dev)
	286	{
	287	struct i2c_client *client = to_i2c_client(dev);
	288
	289	als_set_power_state(client, false);
	290	return 0;
	291	}
	292
	293	static int apds9802als_runtime_resume(struct device *dev)
	294	{
	295	struct i2c_client *client = to_i2c_client(dev);
	296
	297	als_set_power_state(client, true);
	298	return 0;
	299	}
	300
	301	static const struct dev_pm_ops apds9802als_pm_ops = {
	302	.runtime_suspend = apds9802als_runtime_suspend,
	303	.runtime_resume = apds9802als_runtime_resume,
	304	};
	305
	306	#define APDS9802ALS_PM_OPS (&apds9802als_pm_ops)
	307
	308	#else /* CONFIG_PM */
	309	#define apds9802als_suspend NULL
	310	#define apds9802als_resume NULL
	311	#define APDS9802ALS_PM_OPS NULL
	312	#endif /* CONFIG_PM */
	313
22d96aa5	314	static struct i2c_device_id apds9802als_id[] = {
	315	{ DRIVER_NAME, 0 },
	316	{ }
	317	};
	318
	319	MODULE_DEVICE_TABLE(i2c, apds9802als_id);
	320
	321	static struct i2c_driver apds9802als_driver = {
	322	.driver = {
f0cfec11 HL	323	.name = DRIVER_NAME,
f0cfec11 HL	324	.pm = APDS9802ALS_PM_OPS,
22d96aa5	325	},
	326	.probe = apds9802als_probe,
	327	.remove = apds9802als_remove,
	328	.suspend = apds9802als_suspend,
	329	.resume = apds9802als_resume,
	330	.id_table = apds9802als_id,
	331	};
	332
	333	static int __init sensor_apds9802als_init(void)
	334	{
	335	return i2c_add_driver(&apds9802als_driver);
	336	}
	337
	338	static void __exit sensor_apds9802als_exit(void)
	339	{
	340	i2c_del_driver(&apds9802als_driver);
	341	}
	342	module_init(sensor_apds9802als_init);
	343	module_exit(sensor_apds9802als_exit);
	344
	345	MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
	346	MODULE_DESCRIPTION("Avago apds9802als ALS Driver");
	347	MODULE_LICENSE("GPL v2");