[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/gpio.h>
#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 "../iio.h"
#include "../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 0:
		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_GYRO,
		.modified = 1,
		.channel2 = IIO_MOD_Z,
		.address = ADIS16080_DIN_GYRO,
	}, {
		.type = IIO_IN,
		.indexed = 1,
		.channel = 0,
		.address = ADIS16080_DIN_AIN1,
	}, {
		.type = IIO_IN,
		.indexed = 1,
		.channel = 1,
		.address = ADIS16080_DIN_AIN2,
	}, {
		.type = IIO_TEMP,
		.indexed = 1,
		.channel = 0,
		.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));

	return 0;
}

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

static __init int adis16080_init(void)
{
	return spi_register_driver(&adis16080_driver);
}
module_init(adis16080_init);

static __exit void adis16080_exit(void)
{
	spi_unregister_driver(&adis16080_driver);
}
module_exit(adis16080_exit);

MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ADIS16080/100 Yaw Rate Gyroscope Driver");
MODULE_LICENSE("GPL v2");
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/gpio.h>
	9	#include <linux/delay.h>
	10	#include <linux/mutex.h>
	11	#include <linux/device.h>
	12	#include <linux/kernel.h>
	13	#include <linux/spi/spi.h>
	14	#include <linux/slab.h>
	15	#include <linux/sysfs.h>
99c97852	16	#include <linux/module.h>
1b2f99e1 BS	17
	18	#include "../iio.h"
	19	#include "../sysfs.h"
1b2f99e1	20
35d2b6f9 JC	21	#define ADIS16080_DIN_GYRO (0 << 10) /* Gyroscope output */
	22	#define ADIS16080_DIN_TEMP (1 << 10) /* Temperature output */
	23	#define ADIS16080_DIN_AIN1 (2 << 10)
	24	#define ADIS16080_DIN_AIN2 (3 << 10)
	25
	26	/*
	27	* 1: Write contents on DIN to control register.
	28	* 0: No changes to control register.
	29	*/
	30
	31	#define ADIS16080_DIN_WRITE (1 << 15)
	32
	33	/**
	34	* struct adis16080_state - device instance specific data
	35	* @us: actual spi_device to write data
25985edc	36	* @buf: transmit or receive buffer
35d2b6f9 JC	37	* @buf_lock: mutex to protect tx and rx
	38	**/
	39	struct adis16080_state {
	40	struct spi_device *us;
35d2b6f9 JC	41	struct mutex buf_lock;
	42
	43	u8 buf[2] ____cacheline_aligned;
	44	};
1b2f99e1	45
584c81fb	46	static int adis16080_spi_write(struct iio_dev *indio_dev,
1b2f99e1 BS	47	u16 val)
	48	{
	49	int ret;
1dd9290a	50	struct adis16080_state *st = iio_priv(indio_dev);
1b2f99e1 BS	51
1b2f99e1 BS	52	mutex_lock(&st->buf_lock);
35d2b6f9 JC	53	st->buf[0] = val >> 8;
35d2b6f9 JC	54	st->buf[1] = val;
1b2f99e1	55
35d2b6f9	56	ret = spi_write(st->us, st->buf, 2);
1b2f99e1 BS	57	mutex_unlock(&st->buf_lock);
	58
	59	return ret;
	60	}
	61
584c81fb JC	62	static int adis16080_spi_read(struct iio_dev *indio_dev,
584c81fb JC	63	u16 *val)
1b2f99e1 BS	64	{
1b2f99e1 BS	65	int ret;
1dd9290a	66	struct adis16080_state *st = iio_priv(indio_dev);
1b2f99e1 BS	67
	68	mutex_lock(&st->buf_lock);
	69
35d2b6f9	70	ret = spi_read(st->us, st->buf, 2);
1b2f99e1 BS	71
1b2f99e1 BS	72	if (ret == 0)
35d2b6f9	73	*val = ((st->buf[0] & 0xF) << 8) \| st->buf[1];
1b2f99e1 BS	74	mutex_unlock(&st->buf_lock);
	75
	76	return ret;
	77	}
	78
584c81fb JC	79	static int adis16080_read_raw(struct iio_dev *indio_dev,
	80	struct iio_chan_spec const *chan,
	81	int *val,
	82	int *val2,
	83	long mask)
1b2f99e1	84	{
584c81fb JC	85	int ret = -EINVAL;
584c81fb JC	86	u16 ut;
1b2f99e1	87	/* Take the iio_dev status lock */
584c81fb	88
1b2f99e1	89	mutex_lock(&indio_dev->mlock);
584c81fb JC	90	switch (mask) {
	91	case 0:
	92	ret = adis16080_spi_write(indio_dev,
	93	chan->address \|
	94	ADIS16080_DIN_WRITE);
	95	if (ret < 0)
	96	break;
	97	ret = adis16080_spi_read(indio_dev, &ut);
	98	if (ret < 0)
	99	break;
	100	*val = ut;
	101	ret = IIO_VAL_INT;
	102	break;
	103	}
1b2f99e1 BS	104	mutex_unlock(&indio_dev->mlock);
1b2f99e1 BS	105
584c81fb	106	return ret;
1b2f99e1	107	}
1b2f99e1	108
584c81fb JC	109	static const struct iio_chan_spec adis16080_channels[] = {
	110	{
	111	.type = IIO_GYRO,
	112	.modified = 1,
	113	.channel2 = IIO_MOD_Z,
	114	.address = ADIS16080_DIN_GYRO,
	115	}, {
	116	.type = IIO_IN,
	117	.indexed = 1,
	118	.channel = 0,
	119	.address = ADIS16080_DIN_AIN1,
	120	}, {
	121	.type = IIO_IN,
	122	.indexed = 1,
	123	.channel = 1,
	124	.address = ADIS16080_DIN_AIN2,
	125	}, {
	126	.type = IIO_TEMP,
	127	.indexed = 1,
	128	.channel = 0,
	129	.address = ADIS16080_DIN_TEMP,
	130	}
1b2f99e1 BS	131	};
1b2f99e1 BS	132
6fe8135f	133	static const struct iio_info adis16080_info = {
584c81fb	134	.read_raw = &adis16080_read_raw,
6fe8135f JC	135	.driver_module = THIS_MODULE,
	136	};
	137
1b2f99e1 BS	138	static int __devinit adis16080_probe(struct spi_device *spi)
1b2f99e1 BS	139	{
26d25ae3	140	int ret;
1dd9290a JC	141	struct adis16080_state *st;
	142	struct iio_dev *indio_dev;
	143
	144	/* setup the industrialio driver allocated elements */
	145	indio_dev = iio_allocate_device(sizeof(*st));
	146	if (indio_dev == NULL) {
	147	ret = -ENOMEM;
1b2f99e1 BS	148	goto error_ret;
1b2f99e1 BS	149	}
1dd9290a	150	st = iio_priv(indio_dev);
1b2f99e1	151	/* this is only used for removal purposes */
1dd9290a	152	spi_set_drvdata(spi, indio_dev);
1b2f99e1 BS	153
1b2f99e1 BS	154	/* Allocate the comms buffers */
1b2f99e1 BS	155	st->us = spi;
1b2f99e1 BS	156	mutex_init(&st->buf_lock);
1b2f99e1	157
1dd9290a	158	indio_dev->name = spi->dev.driver->name;
584c81fb JC	159	indio_dev->channels = adis16080_channels;
584c81fb JC	160	indio_dev->num_channels = ARRAY_SIZE(adis16080_channels);
1dd9290a JC	161	indio_dev->dev.parent = &spi->dev;
	162	indio_dev->info = &adis16080_info;
	163	indio_dev->modes = INDIO_DIRECT_MODE;
1b2f99e1	164
1dd9290a	165	ret = iio_device_register(indio_dev);
1b2f99e1	166	if (ret)
8d016b43	167	goto error_free_dev;
1b2f99e1 BS	168	return 0;
1b2f99e1 BS	169
1b2f99e1	170	error_free_dev:
26d25ae3	171	iio_free_device(indio_dev);
1b2f99e1 BS	172	error_ret:
	173	return ret;
	174	}
	175
	176	/* fixme, confirm ordering in this function */
	177	static int adis16080_remove(struct spi_device *spi)
	178	{
1dd9290a	179	iio_device_unregister(spi_get_drvdata(spi));
1b2f99e1 BS	180
	181	return 0;
	182	}
	183
	184	static struct spi_driver adis16080_driver = {
	185	.driver = {
	186	.name = "adis16080",
	187	.owner = THIS_MODULE,
	188	},
	189	.probe = adis16080_probe,
	190	.remove = __devexit_p(adis16080_remove),
	191	};
	192
	193	static __init int adis16080_init(void)
	194	{
	195	return spi_register_driver(&adis16080_driver);
	196	}
	197	module_init(adis16080_init);
	198
	199	static __exit void adis16080_exit(void)
	200	{
	201	spi_unregister_driver(&adis16080_driver);
	202	}
	203	module_exit(adis16080_exit);
	204
	205	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
8d016b43	206	MODULE_DESCRIPTION("Analog Devices ADIS16080/100 Yaw Rate Gyroscope Driver");
1b2f99e1	207	MODULE_LICENSE("GPL v2");