587 lines
14 KiB
C
587 lines
14 KiB
C
/*
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* AD7606 SPI ADC driver
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*
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* Copyright 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/regulator/consumer.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "../ring_generic.h"
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#include "ad7606.h"
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int ad7606_reset(struct ad7606_state *st)
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{
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if (st->have_reset) {
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gpio_set_value(st->pdata->gpio_reset, 1);
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ndelay(100); /* t_reset >= 100ns */
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gpio_set_value(st->pdata->gpio_reset, 0);
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return 0;
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}
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return -ENODEV;
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}
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static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned ch)
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{
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struct ad7606_state *st = iio_priv(indio_dev);
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int ret;
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st->done = false;
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gpio_set_value(st->pdata->gpio_convst, 1);
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ret = wait_event_interruptible(st->wq_data_avail, st->done);
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if (ret)
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goto error_ret;
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if (st->have_frstdata) {
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ret = st->bops->read_block(st->dev, 1, st->data);
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if (ret)
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goto error_ret;
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if (!gpio_get_value(st->pdata->gpio_frstdata)) {
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/* This should never happen */
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ad7606_reset(st);
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ret = -EIO;
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goto error_ret;
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}
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ret = st->bops->read_block(st->dev,
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st->chip_info->num_channels - 1, &st->data[1]);
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if (ret)
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goto error_ret;
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} else {
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ret = st->bops->read_block(st->dev,
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st->chip_info->num_channels, st->data);
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if (ret)
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goto error_ret;
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}
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ret = st->data[ch];
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error_ret:
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gpio_set_value(st->pdata->gpio_convst, 0);
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return ret;
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}
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static int ad7606_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val,
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int *val2,
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long m)
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{
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int ret;
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struct ad7606_state *st = iio_priv(indio_dev);
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unsigned int scale_uv;
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switch (m) {
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case 0:
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mutex_lock(&indio_dev->mlock);
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if (iio_ring_enabled(indio_dev))
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ret = ad7606_scan_from_ring(indio_dev, chan->address);
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else
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ret = ad7606_scan_direct(indio_dev, chan->address);
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mutex_unlock(&indio_dev->mlock);
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if (ret < 0)
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return ret;
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*val = (short) ret;
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return IIO_VAL_INT;
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case (1 << IIO_CHAN_INFO_SCALE_SHARED):
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scale_uv = (st->range * 1000 * 2)
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>> st->chip_info->channels[0].scan_type.realbits;
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*val = scale_uv / 1000;
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*val2 = (scale_uv % 1000) * 1000;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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static ssize_t ad7606_show_range(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad7606_state *st = iio_priv(indio_dev);
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return sprintf(buf, "%u\n", st->range);
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}
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static ssize_t ad7606_store_range(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad7606_state *st = iio_priv(indio_dev);
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unsigned long lval;
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if (strict_strtoul(buf, 10, &lval))
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return -EINVAL;
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if (!(lval == 5000 || lval == 10000)) {
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dev_err(dev, "range is not supported\n");
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return -EINVAL;
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}
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mutex_lock(&indio_dev->mlock);
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gpio_set_value(st->pdata->gpio_range, lval == 10000);
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st->range = lval;
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mutex_unlock(&indio_dev->mlock);
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return count;
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}
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static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, \
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ad7606_show_range, ad7606_store_range, 0);
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static IIO_CONST_ATTR(range_available, "5000 10000");
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static ssize_t ad7606_show_oversampling_ratio(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad7606_state *st = iio_priv(indio_dev);
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return sprintf(buf, "%u\n", st->oversampling);
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}
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static int ad7606_oversampling_get_index(unsigned val)
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{
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unsigned char supported[] = {0, 2, 4, 8, 16, 32, 64};
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int i;
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for (i = 0; i < ARRAY_SIZE(supported); i++)
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if (val == supported[i])
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return i;
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return -EINVAL;
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}
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static ssize_t ad7606_store_oversampling_ratio(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad7606_state *st = iio_priv(indio_dev);
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unsigned long lval;
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int ret;
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if (strict_strtoul(buf, 10, &lval))
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return -EINVAL;
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ret = ad7606_oversampling_get_index(lval);
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if (ret < 0) {
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dev_err(dev, "oversampling %lu is not supported\n", lval);
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return ret;
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}
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mutex_lock(&indio_dev->mlock);
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gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1);
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gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1);
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gpio_set_value(st->pdata->gpio_os1, (ret >> 2) & 1);
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st->oversampling = lval;
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mutex_unlock(&indio_dev->mlock);
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return count;
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}
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static IIO_DEVICE_ATTR(oversampling_ratio, S_IRUGO | S_IWUSR,
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ad7606_show_oversampling_ratio,
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ad7606_store_oversampling_ratio, 0);
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static IIO_CONST_ATTR(oversampling_ratio_available, "0 2 4 8 16 32 64");
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static struct attribute *ad7606_attributes[] = {
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&iio_dev_attr_range.dev_attr.attr,
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&iio_const_attr_range_available.dev_attr.attr,
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&iio_dev_attr_oversampling_ratio.dev_attr.attr,
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&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
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NULL,
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};
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static mode_t ad7606_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad7606_state *st = iio_priv(indio_dev);
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mode_t mode = attr->mode;
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if (!st->have_os &&
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(attr == &iio_dev_attr_oversampling_ratio.dev_attr.attr ||
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attr ==
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&iio_const_attr_oversampling_ratio_available.dev_attr.attr))
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mode = 0;
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else if (!st->have_range &&
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(attr == &iio_dev_attr_range.dev_attr.attr ||
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attr == &iio_const_attr_range_available.dev_attr.attr))
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mode = 0;
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return mode;
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}
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static const struct attribute_group ad7606_attribute_group = {
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.attrs = ad7606_attributes,
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.is_visible = ad7606_attr_is_visible,
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};
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static struct iio_chan_spec ad7606_8_channels[] = {
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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0, 0, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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1, 1, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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2, 2, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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3, 3, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 4, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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4, 4, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 5, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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5, 5, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 6, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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6, 6, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 7, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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7, 7, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN_SOFT_TIMESTAMP(8),
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};
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static struct iio_chan_spec ad7606_6_channels[] = {
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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0, 0, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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1, 1, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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2, 2, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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3, 3, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 4, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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4, 4, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 5, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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5, 5, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN_SOFT_TIMESTAMP(6),
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};
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static struct iio_chan_spec ad7606_4_channels[] = {
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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0, 0, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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1, 1, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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2, 2, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
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(1 << IIO_CHAN_INFO_SCALE_SHARED),
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3, 3, IIO_ST('s', 16, 16, 0), 0),
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
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/*
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* More devices added in future
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*/
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[ID_AD7606_8] = {
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.name = "ad7606",
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.int_vref_mv = 2500,
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.channels = ad7606_8_channels,
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.num_channels = 8,
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},
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[ID_AD7606_6] = {
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.name = "ad7606-6",
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.int_vref_mv = 2500,
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.channels = ad7606_6_channels,
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.num_channels = 6,
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},
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[ID_AD7606_4] = {
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.name = "ad7606-4",
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.int_vref_mv = 2500,
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.channels = ad7606_4_channels,
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.num_channels = 4,
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},
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};
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static int ad7606_request_gpios(struct ad7606_state *st)
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{
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struct gpio gpio_array[3] = {
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[0] = {
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.gpio = st->pdata->gpio_os0,
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.flags = GPIOF_DIR_OUT | ((st->oversampling & 1) ?
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GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
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.label = "AD7606_OS0",
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},
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[1] = {
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.gpio = st->pdata->gpio_os1,
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.flags = GPIOF_DIR_OUT | ((st->oversampling & 2) ?
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GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
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.label = "AD7606_OS1",
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},
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[2] = {
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.gpio = st->pdata->gpio_os2,
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.flags = GPIOF_DIR_OUT | ((st->oversampling & 4) ?
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GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
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.label = "AD7606_OS2",
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},
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};
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int ret;
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ret = gpio_request_one(st->pdata->gpio_convst, GPIOF_OUT_INIT_LOW,
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"AD7606_CONVST");
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if (ret) {
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dev_err(st->dev, "failed to request GPIO CONVST\n");
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return ret;
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}
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ret = gpio_request_array(gpio_array, ARRAY_SIZE(gpio_array));
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if (!ret) {
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st->have_os = true;
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}
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ret = gpio_request_one(st->pdata->gpio_reset, GPIOF_OUT_INIT_LOW,
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"AD7606_RESET");
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if (!ret)
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st->have_reset = true;
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ret = gpio_request_one(st->pdata->gpio_range, GPIOF_DIR_OUT |
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((st->range == 10000) ? GPIOF_INIT_HIGH :
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GPIOF_INIT_LOW), "AD7606_RANGE");
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if (!ret)
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st->have_range = true;
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ret = gpio_request_one(st->pdata->gpio_stby, GPIOF_OUT_INIT_HIGH,
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"AD7606_STBY");
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if (!ret)
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st->have_stby = true;
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if (gpio_is_valid(st->pdata->gpio_frstdata)) {
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ret = gpio_request_one(st->pdata->gpio_frstdata, GPIOF_IN,
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"AD7606_FRSTDATA");
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if (!ret)
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st->have_frstdata = true;
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}
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return 0;
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}
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static void ad7606_free_gpios(struct ad7606_state *st)
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{
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if (st->have_range)
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gpio_free(st->pdata->gpio_range);
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if (st->have_stby)
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gpio_free(st->pdata->gpio_stby);
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if (st->have_os) {
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gpio_free(st->pdata->gpio_os0);
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gpio_free(st->pdata->gpio_os1);
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gpio_free(st->pdata->gpio_os2);
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}
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if (st->have_reset)
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gpio_free(st->pdata->gpio_reset);
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if (st->have_frstdata)
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gpio_free(st->pdata->gpio_frstdata);
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gpio_free(st->pdata->gpio_convst);
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}
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/**
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* Interrupt handler
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*/
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static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
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{
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struct iio_dev *indio_dev = dev_id;
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struct ad7606_state *st = iio_priv(indio_dev);
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if (iio_ring_enabled(indio_dev)) {
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if (!work_pending(&st->poll_work))
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schedule_work(&st->poll_work);
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} else {
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st->done = true;
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wake_up_interruptible(&st->wq_data_avail);
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}
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return IRQ_HANDLED;
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};
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static const struct iio_info ad7606_info = {
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.driver_module = THIS_MODULE,
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.read_raw = &ad7606_read_raw,
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.attrs = &ad7606_attribute_group,
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};
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struct iio_dev *ad7606_probe(struct device *dev, int irq,
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void __iomem *base_address,
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unsigned id,
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const struct ad7606_bus_ops *bops)
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{
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struct ad7606_platform_data *pdata = dev->platform_data;
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struct ad7606_state *st;
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int ret, regdone = 0;
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struct iio_dev *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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goto error_ret;
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}
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st = iio_priv(indio_dev);
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st->dev = dev;
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st->id = id;
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st->irq = irq;
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st->bops = bops;
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st->base_address = base_address;
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st->range = pdata->default_range == 10000 ? 10000 : 5000;
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ret = ad7606_oversampling_get_index(pdata->default_os);
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if (ret < 0) {
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dev_warn(dev, "oversampling %d is not supported\n",
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pdata->default_os);
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st->oversampling = 0;
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} else {
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st->oversampling = pdata->default_os;
|
|
}
|
|
|
|
st->reg = regulator_get(dev, "vcc");
|
|
if (!IS_ERR(st->reg)) {
|
|
ret = regulator_enable(st->reg);
|
|
if (ret)
|
|
goto error_put_reg;
|
|
}
|
|
|
|
st->pdata = pdata;
|
|
st->chip_info = &ad7606_chip_info_tbl[id];
|
|
|
|
indio_dev->dev.parent = dev;
|
|
indio_dev->info = &ad7606_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->name = st->chip_info->name;
|
|
indio_dev->channels = st->chip_info->channels;
|
|
indio_dev->num_channels = st->chip_info->num_channels;
|
|
|
|
init_waitqueue_head(&st->wq_data_avail);
|
|
|
|
ret = ad7606_request_gpios(st);
|
|
if (ret)
|
|
goto error_disable_reg;
|
|
|
|
ret = ad7606_reset(st);
|
|
if (ret)
|
|
dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
|
|
|
|
ret = request_irq(st->irq, ad7606_interrupt,
|
|
IRQF_TRIGGER_FALLING, st->chip_info->name, indio_dev);
|
|
if (ret)
|
|
goto error_free_gpios;
|
|
|
|
ret = ad7606_register_ring_funcs_and_init(indio_dev);
|
|
if (ret)
|
|
goto error_free_irq;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto error_free_irq;
|
|
regdone = 1;
|
|
|
|
ret = iio_ring_buffer_register(indio_dev,
|
|
indio_dev->channels,
|
|
indio_dev->num_channels);
|
|
if (ret)
|
|
goto error_cleanup_ring;
|
|
|
|
return indio_dev;
|
|
|
|
error_cleanup_ring:
|
|
ad7606_ring_cleanup(indio_dev);
|
|
|
|
error_free_irq:
|
|
free_irq(st->irq, indio_dev);
|
|
|
|
error_free_gpios:
|
|
ad7606_free_gpios(st);
|
|
|
|
error_disable_reg:
|
|
if (!IS_ERR(st->reg))
|
|
regulator_disable(st->reg);
|
|
error_put_reg:
|
|
if (!IS_ERR(st->reg))
|
|
regulator_put(st->reg);
|
|
if (regdone)
|
|
iio_device_unregister(indio_dev);
|
|
else
|
|
iio_free_device(indio_dev);
|
|
error_ret:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
int ad7606_remove(struct iio_dev *indio_dev)
|
|
{
|
|
struct ad7606_state *st = iio_priv(indio_dev);
|
|
|
|
iio_ring_buffer_unregister(indio_dev);
|
|
ad7606_ring_cleanup(indio_dev);
|
|
|
|
free_irq(st->irq, indio_dev);
|
|
if (!IS_ERR(st->reg)) {
|
|
regulator_disable(st->reg);
|
|
regulator_put(st->reg);
|
|
}
|
|
|
|
ad7606_free_gpios(st);
|
|
iio_device_unregister(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ad7606_suspend(struct iio_dev *indio_dev)
|
|
{
|
|
struct ad7606_state *st = iio_priv(indio_dev);
|
|
|
|
if (st->have_stby) {
|
|
if (st->have_range)
|
|
gpio_set_value(st->pdata->gpio_range, 1);
|
|
gpio_set_value(st->pdata->gpio_stby, 0);
|
|
}
|
|
}
|
|
|
|
void ad7606_resume(struct iio_dev *indio_dev)
|
|
{
|
|
struct ad7606_state *st = iio_priv(indio_dev);
|
|
|
|
if (st->have_stby) {
|
|
if (st->have_range)
|
|
gpio_set_value(st->pdata->gpio_range,
|
|
st->range == 10000);
|
|
|
|
gpio_set_value(st->pdata->gpio_stby, 1);
|
|
ad7606_reset(st);
|
|
}
|
|
}
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
|
|
MODULE_LICENSE("GPL v2");
|