[linux-2.6-block.git] / drivers / iio / light / jsa1212.c

/*
 * JSA1212 Ambient Light & Proximity Sensor Driver
 *
 * Copyright (c) 2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 *
 * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
 *
 * TODO: Interrupt support, thresholds, range support.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

/* JSA1212 reg address */
#define JSA1212_CONF_REG		0x01
#define JSA1212_INT_REG			0x02
#define JSA1212_PXS_LT_REG		0x03
#define JSA1212_PXS_HT_REG		0x04
#define JSA1212_ALS_TH1_REG		0x05
#define JSA1212_ALS_TH2_REG		0x06
#define JSA1212_ALS_TH3_REG		0x07
#define JSA1212_PXS_DATA_REG		0x08
#define JSA1212_ALS_DT1_REG		0x09
#define JSA1212_ALS_DT2_REG		0x0A
#define JSA1212_ALS_RNG_REG		0x0B
#define JSA1212_MAX_REG			0x0C

/* JSA1212 reg masks */
#define JSA1212_CONF_MASK		0xFF
#define JSA1212_INT_MASK		0xFF
#define JSA1212_PXS_LT_MASK		0xFF
#define JSA1212_PXS_HT_MASK		0xFF
#define JSA1212_ALS_TH1_MASK		0xFF
#define JSA1212_ALS_TH2_LT_MASK		0x0F
#define JSA1212_ALS_TH2_HT_MASK		0xF0
#define JSA1212_ALS_TH3_MASK		0xFF
#define JSA1212_PXS_DATA_MASK		0xFF
#define JSA1212_ALS_DATA_MASK		0x0FFF
#define JSA1212_ALS_DT1_MASK		0xFF
#define JSA1212_ALS_DT2_MASK		0x0F
#define JSA1212_ALS_RNG_MASK		0x07

/* JSA1212 CONF REG bits */
#define JSA1212_CONF_PXS_MASK		0x80
#define JSA1212_CONF_PXS_ENABLE		0x80
#define JSA1212_CONF_PXS_DISABLE	0x00
#define JSA1212_CONF_ALS_MASK		0x04
#define JSA1212_CONF_ALS_ENABLE		0x04
#define JSA1212_CONF_ALS_DISABLE	0x00
#define JSA1212_CONF_IRDR_MASK		0x08
/* Proxmity sensing IRDR current sink settings */
#define JSA1212_CONF_IRDR_200MA		0x08
#define JSA1212_CONF_IRDR_100MA		0x00
#define JSA1212_CONF_PXS_SLP_MASK	0x70
#define JSA1212_CONF_PXS_SLP_0MS	0x70
#define JSA1212_CONF_PXS_SLP_12MS	0x60
#define JSA1212_CONF_PXS_SLP_50MS	0x50
#define JSA1212_CONF_PXS_SLP_75MS	0x40
#define JSA1212_CONF_PXS_SLP_100MS	0x30
#define JSA1212_CONF_PXS_SLP_200MS	0x20
#define JSA1212_CONF_PXS_SLP_400MS	0x10
#define JSA1212_CONF_PXS_SLP_800MS	0x00

/* JSA1212 INT REG bits */
#define JSA1212_INT_CTRL_MASK		0x01
#define JSA1212_INT_CTRL_EITHER		0x00
#define JSA1212_INT_CTRL_BOTH		0x01
#define JSA1212_INT_ALS_PRST_MASK	0x06
#define JSA1212_INT_ALS_PRST_1CONV	0x00
#define JSA1212_INT_ALS_PRST_4CONV	0x02
#define JSA1212_INT_ALS_PRST_8CONV	0x04
#define JSA1212_INT_ALS_PRST_16CONV	0x06
#define JSA1212_INT_ALS_FLAG_MASK	0x08
#define JSA1212_INT_ALS_FLAG_CLR	0x00
#define JSA1212_INT_PXS_PRST_MASK	0x60
#define JSA1212_INT_PXS_PRST_1CONV	0x00
#define JSA1212_INT_PXS_PRST_4CONV	0x20
#define JSA1212_INT_PXS_PRST_8CONV	0x40
#define JSA1212_INT_PXS_PRST_16CONV	0x60
#define JSA1212_INT_PXS_FLAG_MASK	0x80
#define JSA1212_INT_PXS_FLAG_CLR	0x00

/* JSA1212 ALS RNG REG bits */
#define JSA1212_ALS_RNG_0_2048		0x00
#define JSA1212_ALS_RNG_0_1024		0x01
#define JSA1212_ALS_RNG_0_512		0x02
#define JSA1212_ALS_RNG_0_256		0x03
#define JSA1212_ALS_RNG_0_128		0x04

/* JSA1212 INT threshold range */
#define JSA1212_ALS_TH_MIN	0x0000
#define JSA1212_ALS_TH_MAX	0x0FFF
#define JSA1212_PXS_TH_MIN	0x00
#define JSA1212_PXS_TH_MAX	0xFF

#define JSA1212_ALS_DELAY_MS	200
#define JSA1212_PXS_DELAY_MS	100

#define JSA1212_DRIVER_NAME	"jsa1212"
#define JSA1212_REGMAP_NAME	"jsa1212_regmap"

enum jsa1212_op_mode {
	JSA1212_OPMODE_ALS_EN,
	JSA1212_OPMODE_PXS_EN,
};

struct jsa1212_data {
	struct i2c_client *client;
	struct mutex lock;
	u8 als_rng_idx;
	bool als_en; /* ALS enable status */
	bool pxs_en; /* proximity enable status */
	struct regmap *regmap;
};

/* ALS range idx to val mapping */
static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
						128, 128, 128};

/* Enables or disables ALS function based on status */
static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
{
	int ret;

	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
				JSA1212_CONF_ALS_MASK,
				status);
	if (ret < 0)
		return ret;

	data->als_en = !!status;

	return 0;
}

/* Enables or disables PXS function based on status */
static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
{
	int ret;

	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
				JSA1212_CONF_PXS_MASK,
				status);
	if (ret < 0)
		return ret;

	data->pxs_en = !!status;

	return 0;
}

static int jsa1212_read_als_data(struct jsa1212_data *data,
				unsigned int *val)
{
	int ret;
	__le16 als_data;

	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
	if (ret < 0)
		return ret;

	/* Delay for data output */
	msleep(JSA1212_ALS_DELAY_MS);

	/* Read 12 bit data */
	ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, &als_data, 2);
	if (ret < 0) {
		dev_err(&data->client->dev, "als data read err\n");
		goto als_data_read_err;
	}

	*val = le16_to_cpu(als_data);

als_data_read_err:
	return jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
}

static int jsa1212_read_pxs_data(struct jsa1212_data *data,
				unsigned int *val)
{
	int ret;
	unsigned int pxs_data;

	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
	if (ret < 0)
		return ret;

	/* Delay for data output */
	msleep(JSA1212_PXS_DELAY_MS);

	/* Read out all data */
	ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
	if (ret < 0) {
		dev_err(&data->client->dev, "pxs data read err\n");
		goto pxs_data_read_err;
	}

	*val = pxs_data & JSA1212_PXS_DATA_MASK;

pxs_data_read_err:
	return jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
}

static int jsa1212_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan,
				int *val, int *val2, long mask)
{
	int ret;
	struct jsa1212_data *data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		mutex_lock(&data->lock);
		switch (chan->type) {
		case IIO_LIGHT:
			ret = jsa1212_read_als_data(data, val);
			break;
		case IIO_PROXIMITY:
			ret = jsa1212_read_pxs_data(data, val);
			break;
		default:
			ret = -EINVAL;
			break;
		}
		mutex_unlock(&data->lock);
		return ret < 0 ? ret : IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_LIGHT:
			*val = jsa1212_als_range_val[data->als_rng_idx];
			*val2 = BIT(12); /* Max 12 bit value */
			return IIO_VAL_FRACTIONAL;
		default:
			break;
		}
		break;
	default:
		break;
	}

	return -EINVAL;
}

static const struct iio_chan_spec jsa1212_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
	},
	{
		.type = IIO_PROXIMITY,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	}
};

static const struct iio_info jsa1212_info = {
	.read_raw		= &jsa1212_read_raw,
};

static int jsa1212_chip_init(struct jsa1212_data *data)
{
	int ret;

	ret = regmap_write(data->regmap, JSA1212_CONF_REG,
				(JSA1212_CONF_PXS_SLP_50MS |
				JSA1212_CONF_IRDR_200MA));
	if (ret < 0)
		return ret;

	ret = regmap_write(data->regmap, JSA1212_INT_REG,
				JSA1212_INT_ALS_PRST_4CONV);
	if (ret < 0)
		return ret;

	data->als_rng_idx = JSA1212_ALS_RNG_0_2048;

	return 0;
}

static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case JSA1212_PXS_DATA_REG:
	case JSA1212_ALS_DT1_REG:
	case JSA1212_ALS_DT2_REG:
	case JSA1212_INT_REG:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config jsa1212_regmap_config = {
	.name =  JSA1212_REGMAP_NAME,
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = JSA1212_MAX_REG,
	.cache_type = REGCACHE_RBTREE,
	.volatile_reg = jsa1212_is_volatile_reg,
};

static int jsa1212_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct jsa1212_data *data;
	struct iio_dev *indio_dev;
	struct regmap *regmap;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;

	regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(&client->dev, "Regmap initialization failed.\n");
		return PTR_ERR(regmap);
	}

	data = iio_priv(indio_dev);

	i2c_set_clientdata(client, indio_dev);
	data->client = client;
	data->regmap = regmap;

	mutex_init(&data->lock);

	ret = jsa1212_chip_init(data);
	if (ret < 0)
		return ret;

	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = jsa1212_channels;
	indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
	indio_dev->name = JSA1212_DRIVER_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->info = &jsa1212_info;

	ret = iio_device_register(indio_dev);
	if (ret < 0)
		dev_err(&client->dev, "%s: register device failed\n", __func__);

	return ret;
}

 /* power off the device */
static int jsa1212_power_off(struct jsa1212_data *data)
{
	int ret;

	mutex_lock(&data->lock);

	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
				JSA1212_CONF_ALS_MASK |
				JSA1212_CONF_PXS_MASK,
				JSA1212_CONF_ALS_DISABLE |
				JSA1212_CONF_PXS_DISABLE);

	if (ret < 0)
		dev_err(&data->client->dev, "power off cmd failed\n");

	mutex_unlock(&data->lock);

	return ret;
}

static int jsa1212_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct jsa1212_data *data = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);

	return jsa1212_power_off(data);
}

#ifdef CONFIG_PM_SLEEP
static int jsa1212_suspend(struct device *dev)
{
	struct jsa1212_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	return jsa1212_power_off(data);
}

static int jsa1212_resume(struct device *dev)
{
	int ret = 0;
	struct jsa1212_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	mutex_lock(&data->lock);

	if (data->als_en) {
		ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
		if (ret < 0) {
			dev_err(dev, "als resume failed\n");
			goto unlock_and_ret;
		}
	}

	if (data->pxs_en) {
		ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
		if (ret < 0)
			dev_err(dev, "pxs resume failed\n");
	}

unlock_and_ret:
	mutex_unlock(&data->lock);
	return ret;
}

static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);

#define JSA1212_PM_OPS (&jsa1212_pm_ops)
#else
#define JSA1212_PM_OPS NULL
#endif

static const struct acpi_device_id jsa1212_acpi_match[] = {
	{"JSA1212", 0},
	{ },
};
MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);

static const struct i2c_device_id jsa1212_id[] = {
	{ JSA1212_DRIVER_NAME, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, jsa1212_id);

static struct i2c_driver jsa1212_driver = {
	.driver = {
		.name	= JSA1212_DRIVER_NAME,
		.pm	= JSA1212_PM_OPS,
		.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
	},
	.probe		= jsa1212_probe,
	.remove		= jsa1212_remove,
	.id_table	= jsa1212_id,
};
module_i2c_driver(jsa1212_driver);

MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
995863cc KS	1	/*
	2	* JSA1212 Ambient Light & Proximity Sensor Driver
	3	*
	4	* Copyright (c) 2014, Intel Corporation.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
	16	*
	17	* TODO: Interrupt support, thresholds, range support.
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/slab.h>
	22	#include <linux/module.h>
	23	#include <linux/delay.h>
	24	#include <linux/i2c.h>
	25	#include <linux/mutex.h>
	26	#include <linux/acpi.h>
	27	#include <linux/regmap.h>
	28	#include <linux/iio/iio.h>
	29	#include <linux/iio/sysfs.h>
	30
	31	/* JSA1212 reg address */
	32	#define JSA1212_CONF_REG 0x01
	33	#define JSA1212_INT_REG 0x02
	34	#define JSA1212_PXS_LT_REG 0x03
	35	#define JSA1212_PXS_HT_REG 0x04
	36	#define JSA1212_ALS_TH1_REG 0x05
	37	#define JSA1212_ALS_TH2_REG 0x06
	38	#define JSA1212_ALS_TH3_REG 0x07
	39	#define JSA1212_PXS_DATA_REG 0x08
	40	#define JSA1212_ALS_DT1_REG 0x09
	41	#define JSA1212_ALS_DT2_REG 0x0A
	42	#define JSA1212_ALS_RNG_REG 0x0B
	43	#define JSA1212_MAX_REG 0x0C
	44
	45	/* JSA1212 reg masks */
	46	#define JSA1212_CONF_MASK 0xFF
	47	#define JSA1212_INT_MASK 0xFF
	48	#define JSA1212_PXS_LT_MASK 0xFF
	49	#define JSA1212_PXS_HT_MASK 0xFF
	50	#define JSA1212_ALS_TH1_MASK 0xFF
	51	#define JSA1212_ALS_TH2_LT_MASK 0x0F
	52	#define JSA1212_ALS_TH2_HT_MASK 0xF0
	53	#define JSA1212_ALS_TH3_MASK 0xFF
	54	#define JSA1212_PXS_DATA_MASK 0xFF
	55	#define JSA1212_ALS_DATA_MASK 0x0FFF
	56	#define JSA1212_ALS_DT1_MASK 0xFF
	57	#define JSA1212_ALS_DT2_MASK 0x0F
	58	#define JSA1212_ALS_RNG_MASK 0x07
	59
	60	/* JSA1212 CONF REG bits */
	61	#define JSA1212_CONF_PXS_MASK 0x80
	62	#define JSA1212_CONF_PXS_ENABLE 0x80
	63	#define JSA1212_CONF_PXS_DISABLE 0x00
	64	#define JSA1212_CONF_ALS_MASK 0x04
65	#define JSA1212_CONF_ALS_ENABLE 0x04
66	#define JSA1212_CONF_ALS_DISABLE 0x00
67	#define JSA1212_CONF_IRDR_MASK 0x08
68	/* Proxmity sensing IRDR current sink settings */
69	#define JSA1212_CONF_IRDR_200MA 0x08
70	#define JSA1212_CONF_IRDR_100MA 0x00
71	#define JSA1212_CONF_PXS_SLP_MASK 0x70
72	#define JSA1212_CONF_PXS_SLP_0MS 0x70
73	#define JSA1212_CONF_PXS_SLP_12MS 0x60
74	#define JSA1212_CONF_PXS_SLP_50MS 0x50
75	#define JSA1212_CONF_PXS_SLP_75MS 0x40
76	#define JSA1212_CONF_PXS_SLP_100MS 0x30
77	#define JSA1212_CONF_PXS_SLP_200MS 0x20
78	#define JSA1212_CONF_PXS_SLP_400MS 0x10
79	#define JSA1212_CONF_PXS_SLP_800MS 0x00
80
81	/* JSA1212 INT REG bits */
82	#define JSA1212_INT_CTRL_MASK 0x01
83	#define JSA1212_INT_CTRL_EITHER 0x00
84	#define JSA1212_INT_CTRL_BOTH 0x01
85	#define JSA1212_INT_ALS_PRST_MASK 0x06
86	#define JSA1212_INT_ALS_PRST_1CONV 0x00
87	#define JSA1212_INT_ALS_PRST_4CONV 0x02
88	#define JSA1212_INT_ALS_PRST_8CONV 0x04
89	#define JSA1212_INT_ALS_PRST_16CONV 0x06
90	#define JSA1212_INT_ALS_FLAG_MASK 0x08
91	#define JSA1212_INT_ALS_FLAG_CLR 0x00
92	#define JSA1212_INT_PXS_PRST_MASK 0x60
93	#define JSA1212_INT_PXS_PRST_1CONV 0x00
94	#define JSA1212_INT_PXS_PRST_4CONV 0x20
95	#define JSA1212_INT_PXS_PRST_8CONV 0x40
96	#define JSA1212_INT_PXS_PRST_16CONV 0x60
97	#define JSA1212_INT_PXS_FLAG_MASK 0x80
98	#define JSA1212_INT_PXS_FLAG_CLR 0x00
99
100	/* JSA1212 ALS RNG REG bits */
101	#define JSA1212_ALS_RNG_0_2048 0x00
102	#define JSA1212_ALS_RNG_0_1024 0x01
103	#define JSA1212_ALS_RNG_0_512 0x02
104	#define JSA1212_ALS_RNG_0_256 0x03
105	#define JSA1212_ALS_RNG_0_128 0x04
106
107	/* JSA1212 INT threshold range */
108	#define JSA1212_ALS_TH_MIN 0x0000
109	#define JSA1212_ALS_TH_MAX 0x0FFF
110	#define JSA1212_PXS_TH_MIN 0x00
111	#define JSA1212_PXS_TH_MAX 0xFF
112
113	#define JSA1212_ALS_DELAY_MS 200
114	#define JSA1212_PXS_DELAY_MS 100
115
116	#define JSA1212_DRIVER_NAME "jsa1212"
117	#define JSA1212_REGMAP_NAME "jsa1212_regmap"
118
119	enum jsa1212_op_mode {
120	JSA1212_OPMODE_ALS_EN,
121	JSA1212_OPMODE_PXS_EN,
122	};
123
124	struct jsa1212_data {
125	struct i2c_client *client;
126	struct mutex lock;
127	u8 als_rng_idx;
128	bool als_en; /* ALS enable status */
129	bool pxs_en; /* proximity enable status */
130	struct regmap *regmap;
131	};
132
133	/* ALS range idx to val mapping */
134	static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
135	128, 128, 128};
136
137	/* Enables or disables ALS function based on status */
138	static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
139	{
140	int ret;
141
142	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
143	JSA1212_CONF_ALS_MASK,
144	status);
145	if (ret < 0)
146	return ret;
147
148	data->als_en = !!status;
149
150	return 0;
151	}
152
153	/* Enables or disables PXS function based on status */
154	static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
155	{
156	int ret;
157
158	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
159	JSA1212_CONF_PXS_MASK,
160	status);
161	if (ret < 0)
162	return ret;
163
164	data->pxs_en = !!status;
165
166	return 0;
167	}
168
169	static int jsa1212_read_als_data(struct jsa1212_data *data,
170	unsigned int *val)
171	{
172	int ret;
173	__le16 als_data;
174
175	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
176	if (ret < 0)
177	return ret;
178
179	/* Delay for data output */
180	msleep(JSA1212_ALS_DELAY_MS);
181
182	/* Read 12 bit data */
183	ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, &als_data, 2);
184	if (ret < 0) {
185	dev_err(&data->client->dev, "als data read err\n");
186	goto als_data_read_err;
187	}
188
189	*val = le16_to_cpu(als_data);
190
191	als_data_read_err:
192	return jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
193	}
194
195	static int jsa1212_read_pxs_data(struct jsa1212_data *data,
196	unsigned int *val)
197	{
198	int ret;
199	unsigned int pxs_data;
200
201	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
202	if (ret < 0)
203	return ret;
204
205	/* Delay for data output */
206	msleep(JSA1212_PXS_DELAY_MS);
207
208	/* Read out all data */
209	ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
210	if (ret < 0) {
211	dev_err(&data->client->dev, "pxs data read err\n");
212	goto pxs_data_read_err;
213	}
214
215	*val = pxs_data & JSA1212_PXS_DATA_MASK;
216
217	pxs_data_read_err:
218	return jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
219	}
220
221	static int jsa1212_read_raw(struct iio_dev *indio_dev,
222	struct iio_chan_spec const *chan,
223	int val, int val2, long mask)
224	{
225	int ret;
226	struct jsa1212_data *data = iio_priv(indio_dev);
227
228	switch (mask) {
229	case IIO_CHAN_INFO_RAW:
230	mutex_lock(&data->lock);
231	switch (chan->type) {
232	case IIO_LIGHT:
233	ret = jsa1212_read_als_data(data, val);
234	break;
235	case IIO_PROXIMITY:
236	ret = jsa1212_read_pxs_data(data, val);
237	break;
238	default:
239	ret = -EINVAL;
240	break;
241	}
242	mutex_unlock(&data->lock);
243	return ret < 0 ? ret : IIO_VAL_INT;
244	case IIO_CHAN_INFO_SCALE:
245	switch (chan->type) {
246	case IIO_LIGHT:
247	*val = jsa1212_als_range_val[data->als_rng_idx];
248	val2 = BIT(12); / Max 12 bit value */
249	return IIO_VAL_FRACTIONAL;
250	default:
251	break;
252	}
253	break;
254	default:
255	break;
256	}
257
258	return -EINVAL;
259	}
260
261	static const struct iio_chan_spec jsa1212_channels[] = {
262	{
263	.type = IIO_LIGHT,
264	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
265	BIT(IIO_CHAN_INFO_SCALE),
266	},
267	{
268	.type = IIO_PROXIMITY,
269	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
270	}
271	};
272
273	static const struct iio_info jsa1212_info = {
995863cc KS	274	.read_raw = &jsa1212_read_raw,
	275	};
	276
	277	static int jsa1212_chip_init(struct jsa1212_data *data)
	278	{
	279	int ret;
	280
	281	ret = regmap_write(data->regmap, JSA1212_CONF_REG,
	282	(JSA1212_CONF_PXS_SLP_50MS \|
	283	JSA1212_CONF_IRDR_200MA));
	284	if (ret < 0)
	285	return ret;
	286
	287	ret = regmap_write(data->regmap, JSA1212_INT_REG,
	288	JSA1212_INT_ALS_PRST_4CONV);
	289	if (ret < 0)
	290	return ret;
	291
	292	data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
	293
	294	return 0;
	295	}
	296
	297	static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
	298	{
	299	switch (reg) {
	300	case JSA1212_PXS_DATA_REG:
	301	case JSA1212_ALS_DT1_REG:
	302	case JSA1212_ALS_DT2_REG:
	303	case JSA1212_INT_REG:
	304	return true;
	305	default:
	306	return false;
	307	}
	308	}
	309
9820d883	310	static const struct regmap_config jsa1212_regmap_config = {
995863cc KS	311	.name = JSA1212_REGMAP_NAME,
	312	.reg_bits = 8,
	313	.val_bits = 8,
	314	.max_register = JSA1212_MAX_REG,
	315	.cache_type = REGCACHE_RBTREE,
	316	.volatile_reg = jsa1212_is_volatile_reg,
	317	};
	318
	319	static int jsa1212_probe(struct i2c_client *client,
	320	const struct i2c_device_id *id)
	321	{
	322	struct jsa1212_data *data;
	323	struct iio_dev *indio_dev;
	324	struct regmap *regmap;
	325	int ret;
	326
995863cc KS	327	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	328	if (!indio_dev)
	329	return -ENOMEM;
	330
	331	regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
	332	if (IS_ERR(regmap)) {
	333	dev_err(&client->dev, "Regmap initialization failed.\n");
	334	return PTR_ERR(regmap);
	335	}
	336
	337	data = iio_priv(indio_dev);
	338
	339	i2c_set_clientdata(client, indio_dev);
	340	data->client = client;
	341	data->regmap = regmap;
	342
	343	mutex_init(&data->lock);
	344
	345	ret = jsa1212_chip_init(data);
	346	if (ret < 0)
	347	return ret;
	348
	349	indio_dev->dev.parent = &client->dev;
	350	indio_dev->channels = jsa1212_channels;
	351	indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
	352	indio_dev->name = JSA1212_DRIVER_NAME;
	353	indio_dev->modes = INDIO_DIRECT_MODE;
	354
	355	indio_dev->info = &jsa1212_info;
	356
	357	ret = iio_device_register(indio_dev);
	358	if (ret < 0)
	359	dev_err(&client->dev, "%s: register device failed\n", __func__);
	360
	361	return ret;
	362	}
	363
	364	/* power off the device */
	365	static int jsa1212_power_off(struct jsa1212_data *data)
	366	{
	367	int ret;
	368
	369	mutex_lock(&data->lock);
	370
	371	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
	372	JSA1212_CONF_ALS_MASK \|
	373	JSA1212_CONF_PXS_MASK,
	374	JSA1212_CONF_ALS_DISABLE \|
	375	JSA1212_CONF_PXS_DISABLE);
	376
	377	if (ret < 0)
	378	dev_err(&data->client->dev, "power off cmd failed\n");
	379
	380	mutex_unlock(&data->lock);
	381
	382	return ret;
	383	}
	384
	385	static int jsa1212_remove(struct i2c_client *client)
	386	{
	387	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	388	struct jsa1212_data *data = iio_priv(indio_dev);
	389
	390	iio_device_unregister(indio_dev);
391
392	return jsa1212_power_off(data);
393	}
394
395	#ifdef CONFIG_PM_SLEEP
396	static int jsa1212_suspend(struct device *dev)
397	{
398	struct jsa1212_data *data;
399
400	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
401
402	return jsa1212_power_off(data);
403	}
404
405	static int jsa1212_resume(struct device *dev)
406	{
407	int ret = 0;
408	struct jsa1212_data *data;
409
410	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
411
412	mutex_lock(&data->lock);
413
414	if (data->als_en) {
415	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
416	if (ret < 0) {
417	dev_err(dev, "als resume failed\n");
418	goto unlock_and_ret;
419	}
420	}
421
422	if (data->pxs_en) {
423	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
424	if (ret < 0)
425	dev_err(dev, "pxs resume failed\n");
426	}
427
428	unlock_and_ret:
429	mutex_unlock(&data->lock);
430	return ret;
431	}
432
433	static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
434
435	#define JSA1212_PM_OPS (&jsa1212_pm_ops)
436	#else
437	#define JSA1212_PM_OPS NULL
438	#endif
439
440	static const struct acpi_device_id jsa1212_acpi_match[] = {
441	{"JSA1212", 0},
442	{ },
443	};
444	MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
445
446	static const struct i2c_device_id jsa1212_id[] = {
447	{ JSA1212_DRIVER_NAME, 0 },
448	{ }
449	};
450	MODULE_DEVICE_TABLE(i2c, jsa1212_id);
451
452	static struct i2c_driver jsa1212_driver = {
453	.driver = {
454	.name = JSA1212_DRIVER_NAME,
455	.pm = JSA1212_PM_OPS,
995863cc KS	456	.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
	457	},
	458	.probe = jsa1212_probe,
	459	.remove = jsa1212_remove,
	460	.id_table = jsa1212_id,
	461	};
	462	module_i2c_driver(jsa1212_driver);
	463
	464	MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
	465	MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
	466	MODULE_LICENSE("GPL v2");