2018-08-20 10:01:14 +00:00
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// SPDX-License-Identifier: GPL-2.0
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2017-05-14 19:51:10 +00:00
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/*
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* IIO multiplexer driver
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*
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* Copyright (C) 2017 Axentia Technologies AB
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*
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* Author: Peter Rosin <peda@axentia.se>
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*/
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#include <linux/err.h>
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#include <linux/iio/consumer.h>
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#include <linux/iio/iio.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/mux/consumer.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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struct mux_ext_info_cache {
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char *data;
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ssize_t size;
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};
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struct mux_child {
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struct mux_ext_info_cache *ext_info_cache;
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};
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struct mux {
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int cached_state;
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struct mux_control *control;
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struct iio_channel *parent;
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struct iio_dev *indio_dev;
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struct iio_chan_spec *chan;
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struct iio_chan_spec_ext_info *ext_info;
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struct mux_child *child;
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};
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static int iio_mux_select(struct mux *mux, int idx)
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{
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struct mux_child *child = &mux->child[idx];
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struct iio_chan_spec const *chan = &mux->chan[idx];
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int ret;
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int i;
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ret = mux_control_select(mux->control, chan->channel);
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if (ret < 0) {
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mux->cached_state = -1;
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return ret;
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}
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if (mux->cached_state == chan->channel)
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return 0;
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if (chan->ext_info) {
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for (i = 0; chan->ext_info[i].name; ++i) {
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const char *attr = chan->ext_info[i].name;
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struct mux_ext_info_cache *cache;
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cache = &child->ext_info_cache[i];
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if (cache->size < 0)
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continue;
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ret = iio_write_channel_ext_info(mux->parent, attr,
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cache->data,
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cache->size);
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if (ret < 0) {
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mux_control_deselect(mux->control);
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mux->cached_state = -1;
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return ret;
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}
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}
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}
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mux->cached_state = chan->channel;
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return 0;
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}
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static void iio_mux_deselect(struct mux *mux)
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{
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mux_control_deselect(mux->control);
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}
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static int mux_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, long mask)
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{
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struct mux *mux = iio_priv(indio_dev);
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int idx = chan - mux->chan;
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int ret;
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ret = iio_mux_select(mux, idx);
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if (ret < 0)
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return ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = iio_read_channel_raw(mux->parent, val);
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break;
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case IIO_CHAN_INFO_SCALE:
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ret = iio_read_channel_scale(mux->parent, val, val2);
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break;
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default:
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ret = -EINVAL;
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}
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iio_mux_deselect(mux);
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return ret;
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}
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static int mux_read_avail(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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const int **vals, int *type, int *length,
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long mask)
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{
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struct mux *mux = iio_priv(indio_dev);
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int idx = chan - mux->chan;
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int ret;
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ret = iio_mux_select(mux, idx);
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if (ret < 0)
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return ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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*type = IIO_VAL_INT;
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ret = iio_read_avail_channel_raw(mux->parent, vals, length);
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break;
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default:
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ret = -EINVAL;
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}
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iio_mux_deselect(mux);
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return ret;
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}
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static int mux_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct mux *mux = iio_priv(indio_dev);
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int idx = chan - mux->chan;
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int ret;
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ret = iio_mux_select(mux, idx);
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if (ret < 0)
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return ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = iio_write_channel_raw(mux->parent, val);
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break;
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default:
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ret = -EINVAL;
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}
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iio_mux_deselect(mux);
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return ret;
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}
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static const struct iio_info mux_info = {
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.read_raw = mux_read_raw,
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.read_avail = mux_read_avail,
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.write_raw = mux_write_raw,
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};
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static ssize_t mux_read_ext_info(struct iio_dev *indio_dev, uintptr_t private,
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struct iio_chan_spec const *chan, char *buf)
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{
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struct mux *mux = iio_priv(indio_dev);
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int idx = chan - mux->chan;
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ssize_t ret;
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ret = iio_mux_select(mux, idx);
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if (ret < 0)
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return ret;
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ret = iio_read_channel_ext_info(mux->parent,
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mux->ext_info[private].name,
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buf);
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iio_mux_deselect(mux);
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return ret;
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}
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static ssize_t mux_write_ext_info(struct iio_dev *indio_dev, uintptr_t private,
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struct iio_chan_spec const *chan,
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const char *buf, size_t len)
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{
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struct device *dev = indio_dev->dev.parent;
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struct mux *mux = iio_priv(indio_dev);
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int idx = chan - mux->chan;
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char *new;
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ssize_t ret;
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if (len >= PAGE_SIZE)
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return -EINVAL;
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ret = iio_mux_select(mux, idx);
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if (ret < 0)
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return ret;
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new = devm_kmemdup(dev, buf, len + 1, GFP_KERNEL);
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if (!new) {
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iio_mux_deselect(mux);
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return -ENOMEM;
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}
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new[len] = 0;
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ret = iio_write_channel_ext_info(mux->parent,
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mux->ext_info[private].name,
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buf, len);
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if (ret < 0) {
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iio_mux_deselect(mux);
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devm_kfree(dev, new);
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return ret;
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}
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devm_kfree(dev, mux->child[idx].ext_info_cache[private].data);
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mux->child[idx].ext_info_cache[private].data = new;
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mux->child[idx].ext_info_cache[private].size = len;
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iio_mux_deselect(mux);
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return ret;
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}
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static int mux_configure_channel(struct device *dev, struct mux *mux,
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u32 state, const char *label, int idx)
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{
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struct mux_child *child = &mux->child[idx];
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struct iio_chan_spec *chan = &mux->chan[idx];
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struct iio_chan_spec const *pchan = mux->parent->channel;
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char *page = NULL;
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int num_ext_info;
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int i;
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int ret;
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chan->indexed = 1;
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chan->output = pchan->output;
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chan->datasheet_name = label;
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chan->ext_info = mux->ext_info;
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ret = iio_get_channel_type(mux->parent, &chan->type);
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if (ret < 0) {
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dev_err(dev, "failed to get parent channel type\n");
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return ret;
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}
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if (iio_channel_has_info(pchan, IIO_CHAN_INFO_RAW))
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chan->info_mask_separate |= BIT(IIO_CHAN_INFO_RAW);
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if (iio_channel_has_info(pchan, IIO_CHAN_INFO_SCALE))
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chan->info_mask_separate |= BIT(IIO_CHAN_INFO_SCALE);
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if (iio_channel_has_available(pchan, IIO_CHAN_INFO_RAW))
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chan->info_mask_separate_available |= BIT(IIO_CHAN_INFO_RAW);
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if (state >= mux_control_states(mux->control)) {
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dev_err(dev, "too many channels\n");
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return -EINVAL;
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}
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chan->channel = state;
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num_ext_info = iio_get_channel_ext_info_count(mux->parent);
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if (num_ext_info) {
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page = devm_kzalloc(dev, PAGE_SIZE, GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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}
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treewide: devm_kzalloc() -> devm_kcalloc()
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:
devm_kzalloc(handle, a * b, gfp)
with:
devm_kcalloc(handle, a * b, gfp)
as well as handling cases of:
devm_kzalloc(handle, a * b * c, gfp)
with:
devm_kzalloc(handle, array3_size(a, b, c), gfp)
as it's slightly less ugly than:
devm_kcalloc(handle, array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
devm_kzalloc(handle, 4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@
(
devm_kzalloc(HANDLE,
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
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devm_kzalloc(HANDLE,
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@
(
devm_kzalloc(HANDLE,
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(char) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(u8) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(__u8) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(char) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
devm_kzalloc(HANDLE,
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@
(
devm_kzalloc(HANDLE,
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
devm_kzalloc(HANDLE,
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
|
devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- (E1) * E2
+ E1, E2
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- (E1) * (E2)
+ E1, E2
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 21:07:58 +00:00
|
|
|
child->ext_info_cache = devm_kcalloc(dev,
|
|
|
|
num_ext_info,
|
|
|
|
sizeof(*child->ext_info_cache),
|
|
|
|
GFP_KERNEL);
|
2017-07-07 04:53:11 +00:00
|
|
|
if (!child->ext_info_cache)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2017-05-14 19:51:10 +00:00
|
|
|
for (i = 0; i < num_ext_info; ++i) {
|
|
|
|
child->ext_info_cache[i].size = -1;
|
|
|
|
|
|
|
|
if (!pchan->ext_info[i].write)
|
|
|
|
continue;
|
|
|
|
if (!pchan->ext_info[i].read)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
ret = iio_read_channel_ext_info(mux->parent,
|
|
|
|
mux->ext_info[i].name,
|
|
|
|
page);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(dev, "failed to get ext_info '%s'\n",
|
|
|
|
pchan->ext_info[i].name);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
if (ret >= PAGE_SIZE) {
|
|
|
|
dev_err(dev, "too large ext_info '%s'\n",
|
|
|
|
pchan->ext_info[i].name);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
child->ext_info_cache[i].data = devm_kmemdup(dev, page, ret + 1,
|
|
|
|
GFP_KERNEL);
|
2017-07-07 04:53:11 +00:00
|
|
|
if (!child->ext_info_cache[i].data)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2017-05-14 19:51:10 +00:00
|
|
|
child->ext_info_cache[i].data[ret] = 0;
|
|
|
|
child->ext_info_cache[i].size = ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (page)
|
|
|
|
devm_kfree(dev, page);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Same as of_property_for_each_string(), but also keeps track of the
|
|
|
|
* index of each string.
|
|
|
|
*/
|
|
|
|
#define of_property_for_each_string_index(np, propname, prop, s, i) \
|
|
|
|
for (prop = of_find_property(np, propname, NULL), \
|
|
|
|
s = of_prop_next_string(prop, NULL), \
|
|
|
|
i = 0; \
|
|
|
|
s; \
|
|
|
|
s = of_prop_next_string(prop, s), \
|
|
|
|
i++)
|
|
|
|
|
|
|
|
static int mux_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct device *dev = &pdev->dev;
|
|
|
|
struct device_node *np = pdev->dev.of_node;
|
|
|
|
struct iio_dev *indio_dev;
|
|
|
|
struct iio_channel *parent;
|
|
|
|
struct mux *mux;
|
|
|
|
struct property *prop;
|
|
|
|
const char *label;
|
|
|
|
u32 state;
|
|
|
|
int sizeof_ext_info;
|
|
|
|
int children;
|
|
|
|
int sizeof_priv;
|
|
|
|
int i;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (!np)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
parent = devm_iio_channel_get(dev, "parent");
|
2020-08-29 06:47:26 +00:00
|
|
|
if (IS_ERR(parent))
|
|
|
|
return dev_err_probe(dev, PTR_ERR(parent),
|
|
|
|
"failed to get parent channel\n");
|
2017-05-14 19:51:10 +00:00
|
|
|
|
|
|
|
sizeof_ext_info = iio_get_channel_ext_info_count(parent);
|
|
|
|
if (sizeof_ext_info) {
|
|
|
|
sizeof_ext_info += 1; /* one extra entry for the sentinel */
|
|
|
|
sizeof_ext_info *= sizeof(*mux->ext_info);
|
|
|
|
}
|
|
|
|
|
|
|
|
children = 0;
|
|
|
|
of_property_for_each_string(np, "channels", prop, label) {
|
|
|
|
if (*label)
|
|
|
|
children++;
|
|
|
|
}
|
|
|
|
if (children <= 0) {
|
|
|
|
dev_err(dev, "not even a single child\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
sizeof_priv = sizeof(*mux);
|
|
|
|
sizeof_priv += sizeof(*mux->child) * children;
|
|
|
|
sizeof_priv += sizeof(*mux->chan) * children;
|
|
|
|
sizeof_priv += sizeof_ext_info;
|
|
|
|
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof_priv);
|
|
|
|
if (!indio_dev)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
mux = iio_priv(indio_dev);
|
|
|
|
mux->child = (struct mux_child *)(mux + 1);
|
|
|
|
mux->chan = (struct iio_chan_spec *)(mux->child + children);
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, indio_dev);
|
|
|
|
|
|
|
|
mux->parent = parent;
|
|
|
|
mux->cached_state = -1;
|
|
|
|
|
|
|
|
indio_dev->name = dev_name(dev);
|
|
|
|
indio_dev->info = &mux_info;
|
|
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
indio_dev->channels = mux->chan;
|
|
|
|
indio_dev->num_channels = children;
|
|
|
|
if (sizeof_ext_info) {
|
|
|
|
mux->ext_info = devm_kmemdup(dev,
|
|
|
|
parent->channel->ext_info,
|
|
|
|
sizeof_ext_info, GFP_KERNEL);
|
|
|
|
if (!mux->ext_info)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
for (i = 0; mux->ext_info[i].name; ++i) {
|
|
|
|
if (parent->channel->ext_info[i].read)
|
|
|
|
mux->ext_info[i].read = mux_read_ext_info;
|
|
|
|
if (parent->channel->ext_info[i].write)
|
|
|
|
mux->ext_info[i].write = mux_write_ext_info;
|
|
|
|
mux->ext_info[i].private = i;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
mux->control = devm_mux_control_get(dev, NULL);
|
|
|
|
if (IS_ERR(mux->control)) {
|
|
|
|
if (PTR_ERR(mux->control) != -EPROBE_DEFER)
|
|
|
|
dev_err(dev, "failed to get control-mux\n");
|
|
|
|
return PTR_ERR(mux->control);
|
|
|
|
}
|
|
|
|
|
|
|
|
i = 0;
|
|
|
|
of_property_for_each_string_index(np, "channels", prop, label, state) {
|
|
|
|
if (!*label)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
ret = mux_configure_channel(dev, mux, state, label, i++);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = devm_iio_device_register(dev, indio_dev);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(dev, "failed to register iio device\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct of_device_id mux_match[] = {
|
|
|
|
{ .compatible = "io-channel-mux" },
|
|
|
|
{ /* sentinel */ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, mux_match);
|
|
|
|
|
|
|
|
static struct platform_driver mux_driver = {
|
|
|
|
.probe = mux_probe,
|
|
|
|
.driver = {
|
|
|
|
.name = "iio-mux",
|
|
|
|
.of_match_table = mux_match,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
module_platform_driver(mux_driver);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("IIO multiplexer driver");
|
|
|
|
MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
|
|
|
|
MODULE_LICENSE("GPL v2");
|