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* kxsd9.c simple support for the Kionix KXSD9 3D
* accelerometer.
*
* Copyright (c) 2008-2009 Jonathan Cameron <jic23@cam.ac.uk>
*
* 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.
*
* The i2c interface is very similar, so shouldn't be a problem once
* I have a suitable wire made up.
*
* TODO: Support the motion detector
* Uses register address incrementing so could have a
* heavily optimized ring buffer access function.
*/
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/sysfs.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include "../iio.h"
#include "../sysfs.h"
#include "../adc/adc.h"
#include "accel.h"
#define KXSD9_REG_X 0x00
#define KXSD9_REG_Y 0x02
#define KXSD9_REG_Z 0x04
#define KXSD9_REG_AUX 0x06
#define KXSD9_REG_RESET 0x0a
#define KXSD9_REG_CTRL_C 0x0c
#define KXSD9_FS_8 0x00
#define KXSD9_FS_6 0x01
#define KXSD9_FS_4 0x02
#define KXSD9_FS_2 0x03
#define KXSD9_FS_MASK 0x03
#define KXSD9_REG_CTRL_B 0x0d
#define KXSD9_REG_CTRL_A 0x0e
#define KXSD9_READ(a) (0x80 | (a))
#define KXSD9_WRITE(a) (a)
#define IIO_DEV_ATTR_ACCEL_SET_RANGE(_mode, _show, _store) \
IIO_DEVICE_ATTR(accel_range, _mode, _show, _store, 0)
#define KXSD9_STATE_RX_SIZE 2
#define KXSD9_STATE_TX_SIZE 4
/**
* struct kxsd9_state - device related storage
* @buf_lock: protect the rx and tx buffers.
* @indio_dev: associated industrial IO device
* @us: spi device
* @rx: single rx buffer storage
* @tx: single tx buffer storage
**/
struct kxsd9_state {
struct mutex buf_lock;
struct iio_dev *indio_dev;
struct spi_device *us;
u8 *rx;
u8 *tx;
};
/* This may want to move to mili g to allow for non integer ranges */
static ssize_t kxsd9_read_accel_range(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
ssize_t len = 0;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct kxsd9_state *st = indio_dev->dev_data;
struct spi_transfer xfer = {
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.tx_buf = st->tx,
.rx_buf = st->rx,
};
struct spi_message msg;
mutex_lock(&st->buf_lock);
st->tx[0] = KXSD9_READ(KXSD9_REG_CTRL_C);
st->tx[1] = 0;
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->us, &msg);
if (ret)
goto error_ret;
switch (st->rx[1] & KXSD9_FS_MASK) {
case KXSD9_FS_8:
len += sprintf(buf, "8\n");
break;
case KXSD9_FS_6:
len += sprintf(buf, "6\n");
break;
case KXSD9_FS_4:
len += sprintf(buf, "4\n");
break;
case KXSD9_FS_2:
len += sprintf(buf, "2\n");
break;
}
error_ret:
mutex_unlock(&st->buf_lock);
return ret ? ret : len;
}
static ssize_t kxsd9_write_accel_range(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
long readin;
struct spi_message msg;
int ret;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct kxsd9_state *st = indio_dev->dev_data;
u8 val;
struct spi_transfer xfers[] = {
{
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.tx_buf = st->tx,
.rx_buf = st->rx,
}, {
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.tx_buf = st->tx,
},
};
ret = strict_strtol(buf, 10, &readin);
if (ret)
return ret;
switch (readin) {
case 8:
val = KXSD9_FS_8;
break;
case 6:
val = KXSD9_FS_6;
break;
case 4:
val = KXSD9_FS_4;
break;
case 2:
val = KXSD9_FS_2;
break;
default:
return -EINVAL;
}
mutex_lock(&st->buf_lock);
st->tx[0] = KXSD9_READ(KXSD9_REG_CTRL_C);
st->tx[1] = 0;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
ret = spi_sync(st->us, &msg);
if (ret)
goto error_ret;
st->tx[0] = KXSD9_WRITE(KXSD9_REG_CTRL_C);
st->tx[1] = (st->rx[1] & ~KXSD9_FS_MASK) | val;
spi_message_init(&msg);
spi_message_add_tail(&xfers[1], &msg);
ret = spi_sync(st->us, &msg);
error_ret:
mutex_unlock(&st->buf_lock);
return ret ? ret : len;
}
static ssize_t kxsd9_read_accel(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct spi_message msg;
int ret;
ssize_t len = 0;
u16 val;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct kxsd9_state *st = indio_dev->dev_data;
struct spi_transfer xfers[] = {
{
.bits_per_word = 8,
.len = 1,
.cs_change = 0,
.delay_usecs = 200,
.tx_buf = st->tx,
}, {
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.rx_buf = st->rx,
},
};
mutex_lock(&st->buf_lock);
st->tx[0] = KXSD9_READ(this_attr->address);
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
ret = spi_sync(st->us, &msg);
if (ret)
goto error_ret;
val = (((u16)(st->rx[0])) << 8) | (st->rx[1] & 0xF0);
len = sprintf(buf, "%d\n", val);
error_ret:
mutex_unlock(&st->buf_lock);
return ret ? ret : len;
}
static IIO_DEV_ATTR_ACCEL_X(kxsd9_read_accel, KXSD9_REG_X);
static IIO_DEV_ATTR_ACCEL_Y(kxsd9_read_accel, KXSD9_REG_Y);
static IIO_DEV_ATTR_ACCEL_Z(kxsd9_read_accel, KXSD9_REG_Z);
static IIO_DEV_ATTR_ADC(0, kxsd9_read_accel, KXSD9_REG_AUX);
static IIO_DEV_ATTR_ACCEL_SET_RANGE(S_IRUGO | S_IWUSR,
kxsd9_read_accel_range,
kxsd9_write_accel_range);
static struct attribute *kxsd9_attributes[] = {
&iio_dev_attr_accel_x.dev_attr.attr,
&iio_dev_attr_accel_y.dev_attr.attr,
&iio_dev_attr_accel_z.dev_attr.attr,
&iio_dev_attr_adc_0.dev_attr.attr,
&iio_dev_attr_accel_range.dev_attr.attr,
NULL,
};
static const struct attribute_group kxsd9_attribute_group = {
.attrs = kxsd9_attributes,
};
static int __devinit kxsd9_power_up(struct spi_device *spi)
{
int ret;
struct spi_transfer xfers[2] = {
{
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
}, {
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
},
};
struct spi_message msg;
u8 *tx2;
u8 *tx = kmalloc(2, GFP_KERNEL);
if (tx == NULL) {
ret = -ENOMEM;
goto error_ret;
}
tx2 = kmalloc(2, GFP_KERNEL);
if (tx2 == NULL) {
ret = -ENOMEM;
goto error_free_tx;
}
tx[0] = 0x0d;
tx[1] = 0x40;
tx2[0] = 0x0c;
tx2[1] = 0x9b;
xfers[0].tx_buf = tx;
xfers[1].tx_buf = tx2;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
ret = spi_sync(spi, &msg);
kfree(tx2);
error_free_tx:
kfree(tx);
error_ret:
return ret;
};
static int __devinit kxsd9_probe(struct spi_device *spi)
{
struct kxsd9_state *st;
int ret = 0;
st = kzalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL) {
ret = -ENOMEM;
goto error_ret;
}
spi_set_drvdata(spi, st);
st->rx = kmalloc(sizeof(*st->rx)*KXSD9_STATE_RX_SIZE,
GFP_KERNEL);
if (st->rx == NULL) {
ret = -ENOMEM;
goto error_free_st;
}
st->tx = kmalloc(sizeof(*st->tx)*KXSD9_STATE_TX_SIZE,
GFP_KERNEL);
if (st->tx == NULL) {
ret = -ENOMEM;
goto error_free_rx;
}
st->us = spi;
mutex_init(&st->buf_lock);
st->indio_dev = iio_allocate_device();
if (st->indio_dev == NULL) {
ret = -ENOMEM;
goto error_free_tx;
}
st->indio_dev->dev.parent = &spi->dev;
/* for now */
st->indio_dev->num_interrupt_lines = 0;
st->indio_dev->event_attrs = NULL;
st->indio_dev->attrs = &kxsd9_attribute_group;
st->indio_dev->dev_data = (void *)(st);
st->indio_dev->driver_module = THIS_MODULE;
st->indio_dev->modes = INDIO_DIRECT_MODE;
ret = iio_device_register(st->indio_dev);
if (ret)
goto error_free_dev;
spi->mode = SPI_MODE_0;
spi_setup(spi);
kxsd9_power_up(spi);
return 0;
error_free_dev:
iio_free_device(st->indio_dev);
error_free_tx:
kfree(st->tx);
error_free_rx:
kfree(st->rx);
error_free_st:
kfree(st);
error_ret:
return ret;
}
static int __devexit kxsd9_remove(struct spi_device *spi)
{
struct kxsd9_state *st = spi_get_drvdata(spi);
iio_device_unregister(st->indio_dev);
kfree(st->tx);
kfree(st->rx);
kfree(st);
return 0;
}
static struct spi_driver kxsd9_driver = {
.driver = {
.name = "kxsd9",
.owner = THIS_MODULE,
},
.probe = kxsd9_probe,
.remove = __devexit_p(kxsd9_remove),
};
static __init int kxsd9_spi_init(void)
{
return spi_register_driver(&kxsd9_driver);
}
module_init(kxsd9_spi_init);
static __exit void kxsd9_spi_exit(void)
{
spi_unregister_driver(&kxsd9_driver);
}
module_exit(kxsd9_spi_exit);
MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
MODULE_DESCRIPTION("Kionix KXSD9 SPI driver");
MODULE_LICENSE("GPL v2");
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