![Kees Cook](/assets/img/avatar_default.png)
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 , ...) | 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 , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * COUNT + COUNT , ...) | 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) , ...) | - 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>
466 lines
10 KiB
C
466 lines
10 KiB
C
/*
|
|
* IIO multiplexer driver
|
|
*
|
|
* Copyright (C) 2017 Axentia Technologies AB
|
|
*
|
|
* Author: Peter Rosin <peda@axentia.se>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/iio/consumer.h>
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/mux/consumer.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
struct mux_ext_info_cache {
|
|
char *data;
|
|
ssize_t size;
|
|
};
|
|
|
|
struct mux_child {
|
|
struct mux_ext_info_cache *ext_info_cache;
|
|
};
|
|
|
|
struct mux {
|
|
int cached_state;
|
|
struct mux_control *control;
|
|
struct iio_channel *parent;
|
|
struct iio_dev *indio_dev;
|
|
struct iio_chan_spec *chan;
|
|
struct iio_chan_spec_ext_info *ext_info;
|
|
struct mux_child *child;
|
|
};
|
|
|
|
static int iio_mux_select(struct mux *mux, int idx)
|
|
{
|
|
struct mux_child *child = &mux->child[idx];
|
|
struct iio_chan_spec const *chan = &mux->chan[idx];
|
|
int ret;
|
|
int i;
|
|
|
|
ret = mux_control_select(mux->control, chan->channel);
|
|
if (ret < 0) {
|
|
mux->cached_state = -1;
|
|
return ret;
|
|
}
|
|
|
|
if (mux->cached_state == chan->channel)
|
|
return 0;
|
|
|
|
if (chan->ext_info) {
|
|
for (i = 0; chan->ext_info[i].name; ++i) {
|
|
const char *attr = chan->ext_info[i].name;
|
|
struct mux_ext_info_cache *cache;
|
|
|
|
cache = &child->ext_info_cache[i];
|
|
|
|
if (cache->size < 0)
|
|
continue;
|
|
|
|
ret = iio_write_channel_ext_info(mux->parent, attr,
|
|
cache->data,
|
|
cache->size);
|
|
|
|
if (ret < 0) {
|
|
mux_control_deselect(mux->control);
|
|
mux->cached_state = -1;
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
mux->cached_state = chan->channel;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void iio_mux_deselect(struct mux *mux)
|
|
{
|
|
mux_control_deselect(mux->control);
|
|
}
|
|
|
|
static int mux_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct mux *mux = iio_priv(indio_dev);
|
|
int idx = chan - mux->chan;
|
|
int ret;
|
|
|
|
ret = iio_mux_select(mux, idx);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = iio_read_channel_raw(mux->parent, val);
|
|
break;
|
|
|
|
case IIO_CHAN_INFO_SCALE:
|
|
ret = iio_read_channel_scale(mux->parent, val, val2);
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
iio_mux_deselect(mux);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mux_read_avail(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
const int **vals, int *type, int *length,
|
|
long mask)
|
|
{
|
|
struct mux *mux = iio_priv(indio_dev);
|
|
int idx = chan - mux->chan;
|
|
int ret;
|
|
|
|
ret = iio_mux_select(mux, idx);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
*type = IIO_VAL_INT;
|
|
ret = iio_read_avail_channel_raw(mux->parent, vals, length);
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
iio_mux_deselect(mux);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mux_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct mux *mux = iio_priv(indio_dev);
|
|
int idx = chan - mux->chan;
|
|
int ret;
|
|
|
|
ret = iio_mux_select(mux, idx);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = iio_write_channel_raw(mux->parent, val);
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
iio_mux_deselect(mux);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct iio_info mux_info = {
|
|
.read_raw = mux_read_raw,
|
|
.read_avail = mux_read_avail,
|
|
.write_raw = mux_write_raw,
|
|
};
|
|
|
|
static ssize_t mux_read_ext_info(struct iio_dev *indio_dev, uintptr_t private,
|
|
struct iio_chan_spec const *chan, char *buf)
|
|
{
|
|
struct mux *mux = iio_priv(indio_dev);
|
|
int idx = chan - mux->chan;
|
|
ssize_t ret;
|
|
|
|
ret = iio_mux_select(mux, idx);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = iio_read_channel_ext_info(mux->parent,
|
|
mux->ext_info[private].name,
|
|
buf);
|
|
|
|
iio_mux_deselect(mux);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t mux_write_ext_info(struct iio_dev *indio_dev, uintptr_t private,
|
|
struct iio_chan_spec const *chan,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct device *dev = indio_dev->dev.parent;
|
|
struct mux *mux = iio_priv(indio_dev);
|
|
int idx = chan - mux->chan;
|
|
char *new;
|
|
ssize_t ret;
|
|
|
|
if (len >= PAGE_SIZE)
|
|
return -EINVAL;
|
|
|
|
ret = iio_mux_select(mux, idx);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
new = devm_kmemdup(dev, buf, len + 1, GFP_KERNEL);
|
|
if (!new) {
|
|
iio_mux_deselect(mux);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
new[len] = 0;
|
|
|
|
ret = iio_write_channel_ext_info(mux->parent,
|
|
mux->ext_info[private].name,
|
|
buf, len);
|
|
if (ret < 0) {
|
|
iio_mux_deselect(mux);
|
|
devm_kfree(dev, new);
|
|
return ret;
|
|
}
|
|
|
|
devm_kfree(dev, mux->child[idx].ext_info_cache[private].data);
|
|
mux->child[idx].ext_info_cache[private].data = new;
|
|
mux->child[idx].ext_info_cache[private].size = len;
|
|
|
|
iio_mux_deselect(mux);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mux_configure_channel(struct device *dev, struct mux *mux,
|
|
u32 state, const char *label, int idx)
|
|
{
|
|
struct mux_child *child = &mux->child[idx];
|
|
struct iio_chan_spec *chan = &mux->chan[idx];
|
|
struct iio_chan_spec const *pchan = mux->parent->channel;
|
|
char *page = NULL;
|
|
int num_ext_info;
|
|
int i;
|
|
int ret;
|
|
|
|
chan->indexed = 1;
|
|
chan->output = pchan->output;
|
|
chan->datasheet_name = label;
|
|
chan->ext_info = mux->ext_info;
|
|
|
|
ret = iio_get_channel_type(mux->parent, &chan->type);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to get parent channel type\n");
|
|
return ret;
|
|
}
|
|
|
|
if (iio_channel_has_info(pchan, IIO_CHAN_INFO_RAW))
|
|
chan->info_mask_separate |= BIT(IIO_CHAN_INFO_RAW);
|
|
if (iio_channel_has_info(pchan, IIO_CHAN_INFO_SCALE))
|
|
chan->info_mask_separate |= BIT(IIO_CHAN_INFO_SCALE);
|
|
|
|
if (iio_channel_has_available(pchan, IIO_CHAN_INFO_RAW))
|
|
chan->info_mask_separate_available |= BIT(IIO_CHAN_INFO_RAW);
|
|
|
|
if (state >= mux_control_states(mux->control)) {
|
|
dev_err(dev, "too many channels\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
chan->channel = state;
|
|
|
|
num_ext_info = iio_get_channel_ext_info_count(mux->parent);
|
|
if (num_ext_info) {
|
|
page = devm_kzalloc(dev, PAGE_SIZE, GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
}
|
|
child->ext_info_cache = devm_kcalloc(dev,
|
|
num_ext_info,
|
|
sizeof(*child->ext_info_cache),
|
|
GFP_KERNEL);
|
|
if (!child->ext_info_cache)
|
|
return -ENOMEM;
|
|
|
|
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);
|
|
if (!child->ext_info_cache[i].data)
|
|
return -ENOMEM;
|
|
|
|
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");
|
|
if (IS_ERR(parent)) {
|
|
if (PTR_ERR(parent) != -EPROBE_DEFER)
|
|
dev_err(dev, "failed to get parent channel\n");
|
|
return PTR_ERR(parent);
|
|
}
|
|
|
|
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->dev.parent = 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");
|