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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * isl29020.c - Intersil  ALS Driver
 *
 * Copyright (C) 2008 Intel Corp
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * 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 const 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 const 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
873e65bc	1	// SPDX-License-Identifier: GPL-2.0-only
2e85c4dd KT	2	/*
	3	* isl29020.c - Intersil ALS Driver
	4	*
	5	* Copyright (C) 2008 Intel Corp
	6	*
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
2e85c4dd KT	9	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	10	*
	11	* Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
	12	*/
	13
	14	#include <linux/module.h>
2e85c4dd KT	15	#include <linux/slab.h>
	16	#include <linux/i2c.h>
	17	#include <linux/err.h>
	18	#include <linux/delay.h>
	19	#include <linux/sysfs.h>
	20	#include <linux/pm_runtime.h>
	21
	22	static DEFINE_MUTEX(mutex);
	23
	24	static ssize_t als_sensing_range_show(struct device *dev,
	25	struct device_attribute attr, char buf)
	26	{
	27	struct i2c_client *client = to_i2c_client(dev);
	28	int val;
	29
	30	val = i2c_smbus_read_byte_data(client, 0x00);
	31
	32	if (val < 0)
	33	return val;
	34	return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
	35
	36	}
	37
	38	static ssize_t als_lux_input_data_show(struct device *dev,
	39	struct device_attribute attr, char buf)
	40	{
	41	struct i2c_client *client = to_i2c_client(dev);
	42	int ret_val, val;
	43	unsigned long int lux;
	44	int temp;
	45
	46	pm_runtime_get_sync(dev);
	47	msleep(100);
	48
	49	mutex_lock(&mutex);
	50	temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
	51	if (temp < 0) {
	52	pm_runtime_put_sync(dev);
	53	mutex_unlock(&mutex);
	54	return temp;
	55	}
	56
	57	ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
	58	mutex_unlock(&mutex);
	59
	60	if (ret_val < 0) {
	61	pm_runtime_put_sync(dev);
	62	return ret_val;
	63	}
	64
	65	ret_val \|= temp << 8;
	66	val = i2c_smbus_read_byte_data(client, 0x00);
	67	pm_runtime_put_sync(dev);
	68	if (val < 0)
	69	return val;
	70	lux = ((((1 << (2 * (val & 3))))1000) ret_val) / 65536;
	71	return sprintf(buf, "%ld\n", lux);
	72	}
	73
	74	static ssize_t als_sensing_range_store(struct device *dev,
	75	struct device_attribute attr, const char buf, size_t count)
	76	{
	77	struct i2c_client *client = to_i2c_client(dev);
90482e45	78	int ret_val;
2e85c4dd KT	79	unsigned long val;
2e85c4dd KT	80
f7b41276 JH	81	ret_val = kstrtoul(buf, 10, &val);
	82	if (ret_val)
	83	return ret_val;
	84
2e85c4dd KT	85	if (val < 1 \|\| val > 64000)
	86	return -EINVAL;
	87
	88	/* Pick the smallest sensor range that will meet our requirements */
	89	if (val <= 1000)
	90	val = 1;
	91	else if (val <= 4000)
	92	val = 2;
	93	else if (val <= 16000)
	94	val = 3;
	95	else
	96	val = 4;
	97
	98	ret_val = i2c_smbus_read_byte_data(client, 0x00);
90482e45 DC	99	if (ret_val < 0)
90482e45 DC	100	return ret_val;
2e85c4dd KT	101
	102	ret_val &= 0xFC; /reset the bit before setting them /
	103	ret_val \|= val - 1;
	104	ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
	105
	106	if (ret_val < 0)
	107	return ret_val;
	108	return count;
	109	}
	110
	111	static void als_set_power_state(struct i2c_client *client, int enable)
	112	{
	113	int ret_val;
	114
	115	ret_val = i2c_smbus_read_byte_data(client, 0x00);
	116	if (ret_val < 0)
	117	return;
	118
	119	if (enable)
	120	ret_val \|= 0x80;
	121	else
	122	ret_val &= 0x7F;
	123
	124	i2c_smbus_write_byte_data(client, 0x00, ret_val);
	125	}
	126
	127	static DEVICE_ATTR(lux0_sensor_range, S_IRUGO \| S_IWUSR,
	128	als_sensing_range_show, als_sensing_range_store);
	129	static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
	130
	131	static struct attribute *mid_att_als[] = {
	132	&dev_attr_lux0_sensor_range.attr,
	133	&dev_attr_lux0_input.attr,
	134	NULL
	135	};
	136
64e6d2c1	137	static const struct attribute_group m_als_gr = {
2e85c4dd KT	138	.name = "isl29020",
	139	.attrs = mid_att_als
	140	};
	141
	142	static int als_set_default_config(struct i2c_client *client)
	143	{
	144	int retval;
	145
	146	retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
	147	if (retval < 0) {
	148	dev_err(&client->dev, "default write failed.");
	149	return retval;
	150	}
2a5ac6f7	151	return 0;
2e85c4dd KT	152	}
	153
	154	static int isl29020_probe(struct i2c_client *client,
	155	const struct i2c_device_id *id)
	156	{
	157	int res;
	158
	159	res = als_set_default_config(client);
	160	if (res < 0)
	161	return res;
	162
	163	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
	164	if (res) {
	165	dev_err(&client->dev, "isl29020: device create file failed\n");
	166	return res;
	167	}
	168	dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
	169	als_set_power_state(client, 0);
	170	pm_runtime_enable(&client->dev);
	171	return res;
	172	}
	173
	174	static int isl29020_remove(struct i2c_client *client)
	175	{
2e85c4dd	176	sysfs_remove_group(&client->dev.kobj, &m_als_gr);
2e85c4dd KT	177	return 0;
	178	}
	179
07e4049a	180	static const struct i2c_device_id isl29020_id[] = {
2e85c4dd KT	181	{ "isl29020", 0 },
	182	{ }
	183	};
	184
	185	MODULE_DEVICE_TABLE(i2c, isl29020_id);
	186
	187	#ifdef CONFIG_PM
	188
	189	static int isl29020_runtime_suspend(struct device *dev)
	190	{
	191	struct i2c_client *client = to_i2c_client(dev);
	192	als_set_power_state(client, 0);
	193	return 0;
	194	}
	195
	196	static int isl29020_runtime_resume(struct device *dev)
	197	{
	198	struct i2c_client *client = to_i2c_client(dev);
	199	als_set_power_state(client, 1);
	200	return 0;
	201	}
	202
	203	static const struct dev_pm_ops isl29020_pm_ops = {
	204	.runtime_suspend = isl29020_runtime_suspend,
	205	.runtime_resume = isl29020_runtime_resume,
	206	};
	207
	208	#define ISL29020_PM_OPS (&isl29020_pm_ops)
	209	#else /* CONFIG_PM */
	210	#define ISL29020_PM_OPS NULL
	211	#endif /* CONFIG_PM */
	212
	213	static struct i2c_driver isl29020_driver = {
	214	.driver = {
	215	.name = "isl29020",
	216	.pm = ISL29020_PM_OPS,
	217	},
	218	.probe = isl29020_probe,
	219	.remove = isl29020_remove,
	220	.id_table = isl29020_id,
	221	};
	222
a64fe2ed	223	module_i2c_driver(isl29020_driver);
2e85c4dd	224
b38eeaae	225	MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
2e85c4dd KT	226	MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
2e85c4dd KT	227	MODULE_LICENSE("GPL v2");