[linux-2.6-block.git] / drivers / iio / adc / lp8788_adc.c

/*
 * TI LP8788 MFD - ADC driver
 *
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/driver.h>
#include <linux/iio/machine.h>
#include <linux/mfd/lp8788.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

/* register address */
#define LP8788_ADC_CONF			0x60
#define LP8788_ADC_RAW			0x61
#define LP8788_ADC_DONE			0x63

#define ADC_CONV_START			1

struct lp8788_adc {
	struct lp8788 *lp;
	struct iio_map *map;
	struct mutex lock;
};

static const int lp8788_scale[LPADC_MAX] = {
	[LPADC_VBATT_5P5] = 1343101,
	[LPADC_VIN_CHG]   = 3052503,
	[LPADC_IBATT]     = 610500,
	[LPADC_IC_TEMP]   = 61050,
	[LPADC_VBATT_6P0] = 1465201,
	[LPADC_VBATT_5P0] = 1221001,
	[LPADC_ADC1]      = 610500,
	[LPADC_ADC2]      = 610500,
	[LPADC_VDD]       = 1025641,
	[LPADC_VCOIN]     = 757020,
	[LPADC_ADC3]      = 610500,
	[LPADC_ADC4]      = 610500,
};

static int lp8788_get_adc_result(struct lp8788_adc *adc, enum lp8788_adc_id id,
				int *val)
{
	unsigned int msb;
	unsigned int lsb;
	unsigned int result;
	u8 data;
	u8 rawdata[2];
	int size = ARRAY_SIZE(rawdata);
	int retry = 5;
	int ret;

	data = (id << 1) | ADC_CONV_START;
	ret = lp8788_write_byte(adc->lp, LP8788_ADC_CONF, data);
	if (ret)
		goto err_io;

	/* retry until adc conversion is done */
	data = 0;
	while (retry--) {
		usleep_range(100, 200);

		ret = lp8788_read_byte(adc->lp, LP8788_ADC_DONE, &data);
		if (ret)
			goto err_io;

		/* conversion done */
		if (data)
			break;
	}

	ret = lp8788_read_multi_bytes(adc->lp, LP8788_ADC_RAW, rawdata, size);
	if (ret)
		goto err_io;

	msb = (rawdata[0] << 4) & 0x00000ff0;
	lsb = (rawdata[1] >> 4) & 0x0000000f;
	result = msb | lsb;
	*val = result;

	return 0;

err_io:
	return ret;
}

static int lp8788_adc_read_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *chan,
			int *val, int *val2, long mask)
{
	struct lp8788_adc *adc = iio_priv(indio_dev);
	enum lp8788_adc_id id = chan->channel;
	int ret;

	mutex_lock(&adc->lock);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = lp8788_get_adc_result(adc, id, val) ? -EIO : IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_SCALE:
		*val = lp8788_scale[id] / 1000000;
		*val2 = lp8788_scale[id] % 1000000;
		ret = IIO_VAL_INT_PLUS_MICRO;
		break;
	default:
		ret = -EINVAL;
		break;
	}

	mutex_unlock(&adc->lock);

	return ret;
}

static const struct iio_info lp8788_adc_info = {
	.read_raw = &lp8788_adc_read_raw,
	.driver_module = THIS_MODULE,
};

#define LP8788_CHAN(_id, _type) {				\
		.type = _type,					\
		.indexed = 1,					\
		.channel = LPADC_##_id,				\
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
			BIT(IIO_CHAN_INFO_SCALE),		\
		.datasheet_name = #_id,				\
}

static const struct iio_chan_spec lp8788_adc_channels[] = {
	[LPADC_VBATT_5P5] = LP8788_CHAN(VBATT_5P5, IIO_VOLTAGE),
	[LPADC_VIN_CHG]   = LP8788_CHAN(VIN_CHG, IIO_VOLTAGE),
	[LPADC_IBATT]     = LP8788_CHAN(IBATT, IIO_CURRENT),
	[LPADC_IC_TEMP]   = LP8788_CHAN(IC_TEMP, IIO_TEMP),
	[LPADC_VBATT_6P0] = LP8788_CHAN(VBATT_6P0, IIO_VOLTAGE),
	[LPADC_VBATT_5P0] = LP8788_CHAN(VBATT_5P0, IIO_VOLTAGE),
	[LPADC_ADC1]      = LP8788_CHAN(ADC1, IIO_VOLTAGE),
	[LPADC_ADC2]      = LP8788_CHAN(ADC2, IIO_VOLTAGE),
	[LPADC_VDD]       = LP8788_CHAN(VDD, IIO_VOLTAGE),
	[LPADC_VCOIN]     = LP8788_CHAN(VCOIN, IIO_VOLTAGE),
	[LPADC_ADC3]      = LP8788_CHAN(ADC3, IIO_VOLTAGE),
	[LPADC_ADC4]      = LP8788_CHAN(ADC4, IIO_VOLTAGE),
};

/* default maps used by iio consumer (lp8788-charger driver) */
static struct iio_map lp8788_default_iio_maps[] = {
	{
		.consumer_dev_name = "lp8788-charger",
		.consumer_channel = "lp8788_vbatt_5p0",
		.adc_channel_label = "VBATT_5P0",
	},
	{
		.consumer_dev_name = "lp8788-charger",
		.consumer_channel = "lp8788_adc1",
		.adc_channel_label = "ADC1",
	},
	{ }
};

static int lp8788_iio_map_register(struct iio_dev *indio_dev,
				struct lp8788_platform_data *pdata,
				struct lp8788_adc *adc)
{
	struct iio_map *map;
	int ret;

	map = (!pdata || !pdata->adc_pdata) ?
		lp8788_default_iio_maps : pdata->adc_pdata;

	ret = iio_map_array_register(indio_dev, map);
	if (ret) {
		dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
		return ret;
	}

	adc->map = map;
	return 0;
}

static int lp8788_adc_probe(struct platform_device *pdev)
{
	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
	struct iio_dev *indio_dev;
	struct lp8788_adc *adc;
	int ret;

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

	adc = iio_priv(indio_dev);
	adc->lp = lp;
	platform_set_drvdata(pdev, indio_dev);

	indio_dev->dev.of_node = pdev->dev.of_node;
	ret = lp8788_iio_map_register(indio_dev, lp->pdata, adc);
	if (ret)
		return ret;

	mutex_init(&adc->lock);

	indio_dev->dev.parent = &pdev->dev;
	indio_dev->name = pdev->name;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &lp8788_adc_info;
	indio_dev->channels = lp8788_adc_channels;
	indio_dev->num_channels = ARRAY_SIZE(lp8788_adc_channels);

	ret = iio_device_register(indio_dev);
	if (ret) {
		dev_err(&pdev->dev, "iio dev register err: %d\n", ret);
		goto err_iio_device;
	}

	return 0;

err_iio_device:
	iio_map_array_unregister(indio_dev);
	return ret;
}

static int lp8788_adc_remove(struct platform_device *pdev)
{
	struct iio_dev *indio_dev = platform_get_drvdata(pdev);

	iio_device_unregister(indio_dev);
	iio_map_array_unregister(indio_dev);

	return 0;
}

static struct platform_driver lp8788_adc_driver = {
	.probe = lp8788_adc_probe,
	.remove = lp8788_adc_remove,
	.driver = {
		.name = LP8788_DEV_ADC,
	},
};
module_platform_driver(lp8788_adc_driver);

MODULE_DESCRIPTION("Texas Instruments LP8788 ADC Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lp8788-adc");
Commit	Line	Data
f0347c36 KM	1	/*
	2	* TI LP8788 MFD - ADC driver
	3	*
	4	* Copyright 2012 Texas Instruments
	5	*
	6	* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
	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 version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/delay.h>
	14	#include <linux/iio/iio.h>
	15	#include <linux/iio/driver.h>
	16	#include <linux/iio/machine.h>
	17	#include <linux/mfd/lp8788.h>
	18	#include <linux/module.h>
	19	#include <linux/mutex.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/slab.h>
	22
	23	/* register address */
	24	#define LP8788_ADC_CONF 0x60
	25	#define LP8788_ADC_RAW 0x61
	26	#define LP8788_ADC_DONE 0x63
	27
	28	#define ADC_CONV_START 1
	29
	30	struct lp8788_adc {
	31	struct lp8788 *lp;
	32	struct iio_map *map;
	33	struct mutex lock;
	34	};
	35
	36	static const int lp8788_scale[LPADC_MAX] = {
	37	[LPADC_VBATT_5P5] = 1343101,
	38	[LPADC_VIN_CHG] = 3052503,
	39	[LPADC_IBATT] = 610500,
	40	[LPADC_IC_TEMP] = 61050,
	41	[LPADC_VBATT_6P0] = 1465201,
	42	[LPADC_VBATT_5P0] = 1221001,
	43	[LPADC_ADC1] = 610500,
	44	[LPADC_ADC2] = 610500,
	45	[LPADC_VDD] = 1025641,
	46	[LPADC_VCOIN] = 757020,
	47	[LPADC_ADC3] = 610500,
	48	[LPADC_ADC4] = 610500,
	49	};
	50
	51	static int lp8788_get_adc_result(struct lp8788_adc *adc, enum lp8788_adc_id id,
	52	int *val)
	53	{
	54	unsigned int msb;
	55	unsigned int lsb;
	56	unsigned int result;
	57	u8 data;
	58	u8 rawdata[2];
	59	int size = ARRAY_SIZE(rawdata);
	60	int retry = 5;
	61	int ret;
	62
	63	data = (id << 1) \| ADC_CONV_START;
	64	ret = lp8788_write_byte(adc->lp, LP8788_ADC_CONF, data);
65	if (ret)
66	goto err_io;
67
68	/* retry until adc conversion is done */
69	data = 0;
70	while (retry--) {
71	usleep_range(100, 200);
72
73	ret = lp8788_read_byte(adc->lp, LP8788_ADC_DONE, &data);
74	if (ret)
75	goto err_io;
76
77	/* conversion done */
78	if (data)
79	break;
80	}
81
82	ret = lp8788_read_multi_bytes(adc->lp, LP8788_ADC_RAW, rawdata, size);
83	if (ret)
84	goto err_io;
85
86	msb = (rawdata[0] << 4) & 0x00000ff0;
87	lsb = (rawdata[1] >> 4) & 0x0000000f;
88	result = msb \| lsb;
89	*val = result;
90
91	return 0;
92
93	err_io:
94	return ret;
95	}
96
97	static int lp8788_adc_read_raw(struct iio_dev *indio_dev,
98	struct iio_chan_spec const *chan,
99	int val, int val2, long mask)
100	{
101	struct lp8788_adc *adc = iio_priv(indio_dev);
102	enum lp8788_adc_id id = chan->channel;
103	int ret;
104
105	mutex_lock(&adc->lock);
106
107	switch (mask) {
108	case IIO_CHAN_INFO_RAW:
109	ret = lp8788_get_adc_result(adc, id, val) ? -EIO : IIO_VAL_INT;
110	break;
111	case IIO_CHAN_INFO_SCALE:
112	*val = lp8788_scale[id] / 1000000;
113	*val2 = lp8788_scale[id] % 1000000;
114	ret = IIO_VAL_INT_PLUS_MICRO;
115	break;
116	default:
117	ret = -EINVAL;
118	break;
119	}
120
121	mutex_unlock(&adc->lock);
122
123	return ret;
124	}
125
126	static const struct iio_info lp8788_adc_info = {
127	.read_raw = &lp8788_adc_read_raw,
128	.driver_module = THIS_MODULE,
129	};
130
131	#define LP8788_CHAN(_id, _type) { \
132	.type = _type, \
133	.indexed = 1, \
134	.channel = LPADC_##_id, \
fb45a1b3 JC	135	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \| \
fb45a1b3 JC	136	BIT(IIO_CHAN_INFO_SCALE), \
f0347c36 KM	137	.datasheet_name = #_id, \
	138	}
	139
	140	static const struct iio_chan_spec lp8788_adc_channels[] = {
	141	[LPADC_VBATT_5P5] = LP8788_CHAN(VBATT_5P5, IIO_VOLTAGE),
	142	[LPADC_VIN_CHG] = LP8788_CHAN(VIN_CHG, IIO_VOLTAGE),
	143	[LPADC_IBATT] = LP8788_CHAN(IBATT, IIO_CURRENT),
	144	[LPADC_IC_TEMP] = LP8788_CHAN(IC_TEMP, IIO_TEMP),
	145	[LPADC_VBATT_6P0] = LP8788_CHAN(VBATT_6P0, IIO_VOLTAGE),
	146	[LPADC_VBATT_5P0] = LP8788_CHAN(VBATT_5P0, IIO_VOLTAGE),
	147	[LPADC_ADC1] = LP8788_CHAN(ADC1, IIO_VOLTAGE),
	148	[LPADC_ADC2] = LP8788_CHAN(ADC2, IIO_VOLTAGE),
	149	[LPADC_VDD] = LP8788_CHAN(VDD, IIO_VOLTAGE),
	150	[LPADC_VCOIN] = LP8788_CHAN(VCOIN, IIO_VOLTAGE),
	151	[LPADC_ADC3] = LP8788_CHAN(ADC3, IIO_VOLTAGE),
	152	[LPADC_ADC4] = LP8788_CHAN(ADC4, IIO_VOLTAGE),
	153	};
	154
	155	/* default maps used by iio consumer (lp8788-charger driver) */
	156	static struct iio_map lp8788_default_iio_maps[] = {
	157	{
	158	.consumer_dev_name = "lp8788-charger",
	159	.consumer_channel = "lp8788_vbatt_5p0",
	160	.adc_channel_label = "VBATT_5P0",
	161	},
	162	{
	163	.consumer_dev_name = "lp8788-charger",
	164	.consumer_channel = "lp8788_adc1",
	165	.adc_channel_label = "ADC1",
	166	},
	167	{ }
	168	};
	169
	170	static int lp8788_iio_map_register(struct iio_dev *indio_dev,
	171	struct lp8788_platform_data *pdata,
	172	struct lp8788_adc *adc)
	173	{
	174	struct iio_map *map;
	175	int ret;
	176
	177	map = (!pdata \|\| !pdata->adc_pdata) ?
	178	lp8788_default_iio_maps : pdata->adc_pdata;
	179
	180	ret = iio_map_array_register(indio_dev, map);
	181	if (ret) {
5306f416	182	dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
f0347c36 KM	183	return ret;
	184	}
	185
	186	adc->map = map;
	187	return 0;
	188	}
	189
fc52692c	190	static int lp8788_adc_probe(struct platform_device *pdev)
f0347c36 KM	191	{
	192	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
	193	struct iio_dev *indio_dev;
	194	struct lp8788_adc *adc;
	195	int ret;
	196
8483aa5e	197	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
f0347c36 KM	198	if (!indio_dev)
	199	return -ENOMEM;
	200
	201	adc = iio_priv(indio_dev);
	202	adc->lp = lp;
	203	platform_set_drvdata(pdev, indio_dev);
	204
c3a69e6c	205	indio_dev->dev.of_node = pdev->dev.of_node;
f0347c36 KM	206	ret = lp8788_iio_map_register(indio_dev, lp->pdata, adc);
f0347c36 KM	207	if (ret)
8483aa5e	208	return ret;
f0347c36 KM	209
	210	mutex_init(&adc->lock);
	211
dc116999	212	indio_dev->dev.parent = &pdev->dev;
f0347c36 KM	213	indio_dev->name = pdev->name;
	214	indio_dev->modes = INDIO_DIRECT_MODE;
	215	indio_dev->info = &lp8788_adc_info;
	216	indio_dev->channels = lp8788_adc_channels;
	217	indio_dev->num_channels = ARRAY_SIZE(lp8788_adc_channels);
	218
	219	ret = iio_device_register(indio_dev);
	220	if (ret) {
dc116999	221	dev_err(&pdev->dev, "iio dev register err: %d\n", ret);
f0347c36 KM	222	goto err_iio_device;
	223	}
	224
	225	return 0;
	226
	227	err_iio_device:
6cb2afd7	228	iio_map_array_unregister(indio_dev);
f0347c36 KM	229	return ret;
	230	}
	231
fc52692c	232	static int lp8788_adc_remove(struct platform_device *pdev)
f0347c36 KM	233	{
f0347c36 KM	234	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
f0347c36 KM	235
f0347c36 KM	236	iio_device_unregister(indio_dev);
6cb2afd7	237	iio_map_array_unregister(indio_dev);
f0347c36 KM	238
	239	return 0;
	240	}
	241
	242	static struct platform_driver lp8788_adc_driver = {
	243	.probe = lp8788_adc_probe,
fc52692c	244	.remove = lp8788_adc_remove,
f0347c36 KM	245	.driver = {
f0347c36 KM	246	.name = LP8788_DEV_ADC,
f0347c36 KM	247	},
	248	};
	249	module_platform_driver(lp8788_adc_driver);
	250
	251	MODULE_DESCRIPTION("Texas Instruments LP8788 ADC Driver");
	252	MODULE_AUTHOR("Milo Kim");
	253	MODULE_LICENSE("GPL");
	254	MODULE_ALIAS("platform:lp8788-adc");