[deliverable/linux.git] / drivers / staging / iio / gyro / adis16080_core.c

/*
 * ADIS16080/100 Yaw Rate Gyroscope with SPI driver
 *
 * Copyright 2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/module.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#define ADIS16080_DIN_GYRO   (0 << 10) /* Gyroscope output */
#define ADIS16080_DIN_TEMP   (1 << 10) /* Temperature output */
#define ADIS16080_DIN_AIN1   (2 << 10)
#define ADIS16080_DIN_AIN2   (3 << 10)

/*
 * 1: Write contents on DIN to control register.
 * 0: No changes to control register.
 */

#define ADIS16080_DIN_WRITE  (1 << 15)

/**
 * struct adis16080_state - device instance specific data
 * @us:			actual spi_device to write data
 * @buf:		transmit or receive buffer
 * @buf_lock:		mutex to protect tx and rx
 **/
struct adis16080_state {
	struct spi_device		*us;
	struct mutex			buf_lock;

	u8 buf[2] ____cacheline_aligned;
};

static int adis16080_spi_write(struct iio_dev *indio_dev,
		u16 val)
{
	int ret;
	struct adis16080_state *st = iio_priv(indio_dev);

	mutex_lock(&st->buf_lock);
	st->buf[0] = val >> 8;
	st->buf[1] = val;

	ret = spi_write(st->us, st->buf, 2);
	mutex_unlock(&st->buf_lock);

	return ret;
}

static int adis16080_spi_read(struct iio_dev *indio_dev,
			      u16 *val)
{
	int ret;
	struct adis16080_state *st = iio_priv(indio_dev);

	mutex_lock(&st->buf_lock);

	ret = spi_read(st->us, st->buf, 2);

	if (ret == 0)
		*val = ((st->buf[0] & 0xF) << 8) | st->buf[1];
	mutex_unlock(&st->buf_lock);

	return ret;
}

static int adis16080_read_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int *val,
			     int *val2,
			     long mask)
{
	int ret = -EINVAL;
	u16 ut;
	/* Take the iio_dev status lock */

	mutex_lock(&indio_dev->mlock);
	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = adis16080_spi_write(indio_dev,
					  chan->address |
					  ADIS16080_DIN_WRITE);
		if (ret < 0)
			break;
		ret = adis16080_spi_read(indio_dev, &ut);
		if (ret < 0)
			break;
		*val = ut;
		ret = IIO_VAL_INT;
		break;
	}
	mutex_unlock(&indio_dev->mlock);

	return ret;
}

static const struct iio_chan_spec adis16080_channels[] = {
	{
		.type = IIO_ANGL_VEL,
		.modified = 1,
		.channel2 = IIO_MOD_Z,
		.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
		.address = ADIS16080_DIN_GYRO,
	}, {
		.type = IIO_VOLTAGE,
		.indexed = 1,
		.channel = 0,
		.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
		.address = ADIS16080_DIN_AIN1,
	}, {
		.type = IIO_VOLTAGE,
		.indexed = 1,
		.channel = 1,
		.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
		.address = ADIS16080_DIN_AIN2,
	}, {
		.type = IIO_TEMP,
		.indexed = 1,
		.channel = 0,
		.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
		.address = ADIS16080_DIN_TEMP,
	}
};

static const struct iio_info adis16080_info = {
	.read_raw = &adis16080_read_raw,
	.driver_module = THIS_MODULE,
};

static int __devinit adis16080_probe(struct spi_device *spi)
{
	int ret;
	struct adis16080_state *st;
	struct iio_dev *indio_dev;

	/* setup the industrialio driver allocated elements */
	indio_dev = iio_allocate_device(sizeof(*st));
	if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_ret;
	}
	st = iio_priv(indio_dev);
	/* this is only used for removal purposes */
	spi_set_drvdata(spi, indio_dev);

	/* Allocate the comms buffers */
	st->us = spi;
	mutex_init(&st->buf_lock);

	indio_dev->name = spi->dev.driver->name;
	indio_dev->channels = adis16080_channels;
	indio_dev->num_channels = ARRAY_SIZE(adis16080_channels);
	indio_dev->dev.parent = &spi->dev;
	indio_dev->info = &adis16080_info;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = iio_device_register(indio_dev);
	if (ret)
		goto error_free_dev;
	return 0;

error_free_dev:
	iio_free_device(indio_dev);
error_ret:
	return ret;
}

/* fixme, confirm ordering in this function */
static int adis16080_remove(struct spi_device *spi)
{
	iio_device_unregister(spi_get_drvdata(spi));
	iio_free_device(spi_get_drvdata(spi));

	return 0;
}

static struct spi_driver adis16080_driver = {
	.driver = {
		.name = "adis16080",
		.owner = THIS_MODULE,
	},
	.probe = adis16080_probe,
	.remove = __devexit_p(adis16080_remove),
};
module_spi_driver(adis16080_driver);

MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ADIS16080/100 Yaw Rate Gyroscope Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:adis16080");
Commit	Line	Data
1b2f99e1 BS	1	/*
	2	* ADIS16080/100 Yaw Rate Gyroscope with SPI driver
	3	*
	4	* Copyright 2010 Analog Devices Inc.
	5	*
	6	* Licensed under the GPL-2 or later.
	7	*/
1b2f99e1 BS	8	#include <linux/delay.h>
	9	#include <linux/mutex.h>
	10	#include <linux/device.h>
	11	#include <linux/kernel.h>
	12	#include <linux/spi/spi.h>
	13	#include <linux/slab.h>
	14	#include <linux/sysfs.h>
99c97852	15	#include <linux/module.h>
1b2f99e1	16
06458e27 JC	17	#include <linux/iio/iio.h>
06458e27 JC	18	#include <linux/iio/sysfs.h>
1b2f99e1	19
35d2b6f9 JC	20	#define ADIS16080_DIN_GYRO (0 << 10) /* Gyroscope output */
	21	#define ADIS16080_DIN_TEMP (1 << 10) /* Temperature output */
	22	#define ADIS16080_DIN_AIN1 (2 << 10)
	23	#define ADIS16080_DIN_AIN2 (3 << 10)
	24
	25	/*
	26	* 1: Write contents on DIN to control register.
	27	* 0: No changes to control register.
	28	*/
	29
	30	#define ADIS16080_DIN_WRITE (1 << 15)
	31
	32	/**
	33	* struct adis16080_state - device instance specific data
	34	* @us: actual spi_device to write data
25985edc	35	* @buf: transmit or receive buffer
35d2b6f9 JC	36	* @buf_lock: mutex to protect tx and rx
	37	**/
	38	struct adis16080_state {
	39	struct spi_device *us;
35d2b6f9 JC	40	struct mutex buf_lock;
	41
	42	u8 buf[2] ____cacheline_aligned;
	43	};
1b2f99e1	44
584c81fb	45	static int adis16080_spi_write(struct iio_dev *indio_dev,
1b2f99e1 BS	46	u16 val)
	47	{
	48	int ret;
1dd9290a	49	struct adis16080_state *st = iio_priv(indio_dev);
1b2f99e1 BS	50
1b2f99e1 BS	51	mutex_lock(&st->buf_lock);
35d2b6f9 JC	52	st->buf[0] = val >> 8;
35d2b6f9 JC	53	st->buf[1] = val;
1b2f99e1	54
35d2b6f9	55	ret = spi_write(st->us, st->buf, 2);
1b2f99e1 BS	56	mutex_unlock(&st->buf_lock);
	57
	58	return ret;
	59	}
	60
584c81fb JC	61	static int adis16080_spi_read(struct iio_dev *indio_dev,
584c81fb JC	62	u16 *val)
1b2f99e1 BS	63	{
1b2f99e1 BS	64	int ret;
1dd9290a	65	struct adis16080_state *st = iio_priv(indio_dev);
1b2f99e1 BS	66
	67	mutex_lock(&st->buf_lock);
	68
35d2b6f9	69	ret = spi_read(st->us, st->buf, 2);
1b2f99e1 BS	70
1b2f99e1 BS	71	if (ret == 0)
35d2b6f9	72	*val = ((st->buf[0] & 0xF) << 8) \| st->buf[1];
1b2f99e1 BS	73	mutex_unlock(&st->buf_lock);
	74
	75	return ret;
	76	}
	77
584c81fb JC	78	static int adis16080_read_raw(struct iio_dev *indio_dev,
	79	struct iio_chan_spec const *chan,
	80	int *val,
	81	int *val2,
	82	long mask)
1b2f99e1	83	{
584c81fb JC	84	int ret = -EINVAL;
584c81fb JC	85	u16 ut;
1b2f99e1	86	/* Take the iio_dev status lock */
584c81fb	87
1b2f99e1	88	mutex_lock(&indio_dev->mlock);
584c81fb	89	switch (mask) {
fbaff213	90	case IIO_CHAN_INFO_RAW:
584c81fb JC	91	ret = adis16080_spi_write(indio_dev,
	92	chan->address \|
	93	ADIS16080_DIN_WRITE);
	94	if (ret < 0)
	95	break;
	96	ret = adis16080_spi_read(indio_dev, &ut);
	97	if (ret < 0)
	98	break;
	99	*val = ut;
	100	ret = IIO_VAL_INT;
	101	break;
	102	}
1b2f99e1 BS	103	mutex_unlock(&indio_dev->mlock);
1b2f99e1 BS	104
584c81fb	105	return ret;
1b2f99e1	106	}
1b2f99e1	107
584c81fb JC	108	static const struct iio_chan_spec adis16080_channels[] = {
584c81fb JC	109	{
41ea040c	110	.type = IIO_ANGL_VEL,
584c81fb JC	111	.modified = 1,
584c81fb JC	112	.channel2 = IIO_MOD_Z,
fbaff213	113	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
584c81fb JC	114	.address = ADIS16080_DIN_GYRO,
584c81fb JC	115	}, {
6835cb6b	116	.type = IIO_VOLTAGE,
584c81fb JC	117	.indexed = 1,
584c81fb JC	118	.channel = 0,
fbaff213	119	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
584c81fb JC	120	.address = ADIS16080_DIN_AIN1,
584c81fb JC	121	}, {
6835cb6b	122	.type = IIO_VOLTAGE,
584c81fb JC	123	.indexed = 1,
584c81fb JC	124	.channel = 1,
fbaff213	125	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
584c81fb JC	126	.address = ADIS16080_DIN_AIN2,
	127	}, {
	128	.type = IIO_TEMP,
	129	.indexed = 1,
	130	.channel = 0,
fbaff213	131	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
584c81fb JC	132	.address = ADIS16080_DIN_TEMP,
584c81fb JC	133	}
1b2f99e1 BS	134	};
1b2f99e1 BS	135
6fe8135f	136	static const struct iio_info adis16080_info = {
584c81fb	137	.read_raw = &adis16080_read_raw,
6fe8135f JC	138	.driver_module = THIS_MODULE,
	139	};
	140
1b2f99e1 BS	141	static int __devinit adis16080_probe(struct spi_device *spi)
1b2f99e1 BS	142	{
26d25ae3	143	int ret;
1dd9290a JC	144	struct adis16080_state *st;
	145	struct iio_dev *indio_dev;
	146
	147	/* setup the industrialio driver allocated elements */
	148	indio_dev = iio_allocate_device(sizeof(*st));
	149	if (indio_dev == NULL) {
	150	ret = -ENOMEM;
1b2f99e1 BS	151	goto error_ret;
1b2f99e1 BS	152	}
1dd9290a	153	st = iio_priv(indio_dev);
1b2f99e1	154	/* this is only used for removal purposes */
1dd9290a	155	spi_set_drvdata(spi, indio_dev);
1b2f99e1 BS	156
1b2f99e1 BS	157	/* Allocate the comms buffers */
1b2f99e1 BS	158	st->us = spi;
1b2f99e1 BS	159	mutex_init(&st->buf_lock);
1b2f99e1	160
1dd9290a	161	indio_dev->name = spi->dev.driver->name;
584c81fb JC	162	indio_dev->channels = adis16080_channels;
584c81fb JC	163	indio_dev->num_channels = ARRAY_SIZE(adis16080_channels);
1dd9290a JC	164	indio_dev->dev.parent = &spi->dev;
	165	indio_dev->info = &adis16080_info;
	166	indio_dev->modes = INDIO_DIRECT_MODE;
1b2f99e1	167
1dd9290a	168	ret = iio_device_register(indio_dev);
1b2f99e1	169	if (ret)
8d016b43	170	goto error_free_dev;
1b2f99e1 BS	171	return 0;
1b2f99e1 BS	172
1b2f99e1	173	error_free_dev:
26d25ae3	174	iio_free_device(indio_dev);
1b2f99e1 BS	175	error_ret:
	176	return ret;
	177	}
	178
	179	/* fixme, confirm ordering in this function */
	180	static int adis16080_remove(struct spi_device *spi)
	181	{
1dd9290a	182	iio_device_unregister(spi_get_drvdata(spi));
d2fffd6c	183	iio_free_device(spi_get_drvdata(spi));
1b2f99e1 BS	184
	185	return 0;
	186	}
	187
	188	static struct spi_driver adis16080_driver = {
	189	.driver = {
	190	.name = "adis16080",
	191	.owner = THIS_MODULE,
	192	},
	193	.probe = adis16080_probe,
	194	.remove = __devexit_p(adis16080_remove),
	195	};
ae6ae6fe	196	module_spi_driver(adis16080_driver);
1b2f99e1 BS	197
1b2f99e1 BS	198	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
8d016b43	199	MODULE_DESCRIPTION("Analog Devices ADIS16080/100 Yaw Rate Gyroscope Driver");
1b2f99e1	200	MODULE_LICENSE("GPL v2");
55e4390c	201	MODULE_ALIAS("spi:adis16080");