2010-10-28 03:44:06 +02:00
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/*
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* ADIS16130 Digital Output, High Precision Angular Rate Sensor driver
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*
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* Copyright 2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/list.h>
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2011-07-03 21:49:50 +02:00
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#include <linux/module.h>
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2010-10-28 03:44:06 +02:00
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#include "../iio.h"
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#include "../sysfs.h"
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2011-02-26 18:30:18 +01:00
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#define ADIS16130_CON 0x0
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#define ADIS16130_CON_RD (1 << 6)
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#define ADIS16130_IOP 0x1
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/* 1 = data-ready signal low when unread data on all channels; */
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#define ADIS16130_IOP_ALL_RDY (1 << 3)
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#define ADIS16130_IOP_SYNC (1 << 0) /* 1 = synchronization enabled */
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#define ADIS16130_RATEDATA 0x8 /* Gyroscope output, rate of rotation */
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#define ADIS16130_TEMPDATA 0xA /* Temperature output */
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#define ADIS16130_RATECS 0x28 /* Gyroscope channel setup */
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#define ADIS16130_RATECS_EN (1 << 3) /* 1 = channel enable; */
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#define ADIS16130_TEMPCS 0x2A /* Temperature channel setup */
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#define ADIS16130_TEMPCS_EN (1 << 3)
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#define ADIS16130_RATECONV 0x30
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#define ADIS16130_TEMPCONV 0x32
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#define ADIS16130_MODE 0x38
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#define ADIS16130_MODE_24BIT (1 << 1) /* 1 = 24-bit resolution; */
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/**
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* struct adis16130_state - device instance specific data
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* @us: actual spi_device to write data
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* @buf_lock: mutex to protect tx and rx
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* @buf: unified tx/rx buffer
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**/
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struct adis16130_state {
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struct spi_device *us;
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struct mutex buf_lock;
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u8 buf[4] ____cacheline_aligned;
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};
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2010-10-28 03:44:06 +02:00
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2011-08-12 18:47:59 +02:00
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static int adis16130_spi_read(struct iio_dev *indio_dev, u8 reg_addr, u32 *val)
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2010-10-28 03:44:06 +02:00
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{
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int ret;
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2011-06-27 14:07:45 +02:00
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struct adis16130_state *st = iio_priv(indio_dev);
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2011-08-12 17:55:28 +02:00
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struct spi_message msg;
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struct spi_transfer xfer = {
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.tx_buf = st->buf,
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.rx_buf = st->buf,
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2011-08-12 18:08:41 +02:00
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.len = 4,
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2011-08-12 17:55:28 +02:00
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};
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2010-10-28 03:44:06 +02:00
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mutex_lock(&st->buf_lock);
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2011-02-26 18:30:18 +01:00
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st->buf[0] = ADIS16130_CON_RD | reg_addr;
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2011-08-12 17:55:28 +02:00
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st->buf[1] = st->buf[2] = st->buf[3] = 0;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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ret = spi_sync(st->us, &msg);
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2011-08-12 18:08:41 +02:00
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ret = spi_read(st->us, st->buf, 4);
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2010-10-28 03:44:06 +02:00
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2011-08-12 18:08:41 +02:00
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if (ret == 0)
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*val = (st->buf[1] << 16) | (st->buf[2] << 8) | st->buf[3];
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2010-10-28 03:44:06 +02:00
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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2011-08-12 18:47:59 +02:00
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static int adis16130_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2,
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long mask)
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2010-10-28 03:44:06 +02:00
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{
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2011-08-12 18:47:59 +02:00
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int ret;
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u32 temp;
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2010-10-28 03:44:06 +02:00
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/* Take the iio_dev status lock */
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mutex_lock(&indio_dev->mlock);
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2011-08-12 18:47:59 +02:00
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ret = adis16130_spi_read(indio_dev, chan->address, &temp);
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2010-10-28 03:44:06 +02:00
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mutex_unlock(&indio_dev->mlock);
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2011-08-12 18:47:59 +02:00
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if (ret)
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2010-10-28 03:44:06 +02:00
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return ret;
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2011-08-12 18:47:59 +02:00
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*val = temp;
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return IIO_VAL_INT;
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2010-10-28 03:44:06 +02:00
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}
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2011-08-12 18:47:59 +02:00
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static const struct iio_chan_spec adis16130_channels[] = {
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{
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2011-10-05 16:27:59 +02:00
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.type = IIO_ANGL_VEL,
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2011-08-12 18:47:59 +02:00
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.modified = 1,
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.channel2 = IIO_MOD_Z,
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.address = ADIS16130_RATEDATA,
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}, {
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.type = IIO_TEMP,
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.indexed = 1,
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.channel = 0,
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.address = ADIS16130_TEMPDATA,
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}
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2010-10-28 03:44:06 +02:00
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};
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2011-05-18 15:42:37 +02:00
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static const struct iio_info adis16130_info = {
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2011-08-12 18:47:59 +02:00
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.read_raw = &adis16130_read_raw,
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2011-05-18 15:42:37 +02:00
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.driver_module = THIS_MODULE,
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};
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2010-10-28 03:44:06 +02:00
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static int __devinit adis16130_probe(struct spi_device *spi)
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{
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2011-02-11 15:20:02 +01:00
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int ret;
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2011-06-27 14:07:45 +02:00
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struct adis16130_state *st;
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struct iio_dev *indio_dev;
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/* setup the industrialio driver allocated elements */
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indio_dev = iio_allocate_device(sizeof(*st));
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if (indio_dev == NULL) {
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ret = -ENOMEM;
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2010-10-28 03:44:06 +02:00
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goto error_ret;
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}
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2011-06-27 14:07:45 +02:00
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st = iio_priv(indio_dev);
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2010-10-28 03:44:06 +02:00
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/* this is only used for removal purposes */
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2011-06-27 14:07:45 +02:00
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spi_set_drvdata(spi, indio_dev);
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2010-10-28 03:44:06 +02:00
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st->us = spi;
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mutex_init(&st->buf_lock);
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2011-06-27 14:07:45 +02:00
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indio_dev->name = spi->dev.driver->name;
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2011-08-12 18:47:59 +02:00
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indio_dev->channels = adis16130_channels;
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indio_dev->num_channels = ARRAY_SIZE(adis16130_channels);
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2011-06-27 14:07:45 +02:00
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indio_dev->dev.parent = &spi->dev;
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indio_dev->info = &adis16130_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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2010-10-28 03:44:06 +02:00
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2011-06-27 14:07:45 +02:00
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ret = iio_device_register(indio_dev);
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2010-10-28 03:44:06 +02:00
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if (ret)
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2011-02-11 15:20:02 +01:00
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goto error_free_dev;
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2010-10-28 03:44:06 +02:00
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return 0;
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error_free_dev:
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2011-06-27 14:07:45 +02:00
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iio_free_device(indio_dev);
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2010-10-28 03:44:06 +02:00
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error_ret:
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return ret;
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}
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/* fixme, confirm ordering in this function */
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static int adis16130_remove(struct spi_device *spi)
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{
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2011-06-27 14:07:45 +02:00
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iio_device_unregister(spi_get_drvdata(spi));
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2011-10-14 15:46:58 +02:00
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iio_free_device(spi_get_drvdata(spi));
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2010-10-28 03:44:06 +02:00
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return 0;
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}
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static struct spi_driver adis16130_driver = {
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.driver = {
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.name = "adis16130",
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.owner = THIS_MODULE,
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},
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.probe = adis16130_probe,
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.remove = __devexit_p(adis16130_remove),
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};
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static __init int adis16130_init(void)
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{
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return spi_register_driver(&adis16130_driver);
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}
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module_init(adis16130_init);
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static __exit void adis16130_exit(void)
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{
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spi_unregister_driver(&adis16130_driver);
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}
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module_exit(adis16130_exit);
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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2011-02-26 18:30:18 +01:00
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MODULE_DESCRIPTION("Analog Devices ADIS16130 High Precision Angular Rate");
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2010-10-28 03:44:06 +02:00
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MODULE_LICENSE("GPL v2");
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2011-11-16 08:53:31 +01:00
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MODULE_ALIAS("spi:adis16130");
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