mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-18 02:17:01 +07:00
c773f70015
Avoid this smatch error:
drivers/iio/inkern.c:751 iio_read_avail_channel_raw() error: double unlock 'mutex:&chan->indio_dev->info_exist_lock'
Fixes: 00c5f80c2f
("iio: inkern: add helpers to query available values from channels")
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
870 lines
19 KiB
C
870 lines
19 KiB
C
/* The industrial I/O core in kernel channel mapping
|
|
*
|
|
* Copyright (c) 2011 Jonathan Cameron
|
|
*
|
|
* 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/export.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include "iio_core.h"
|
|
#include <linux/iio/machine.h>
|
|
#include <linux/iio/driver.h>
|
|
#include <linux/iio/consumer.h>
|
|
|
|
struct iio_map_internal {
|
|
struct iio_dev *indio_dev;
|
|
struct iio_map *map;
|
|
struct list_head l;
|
|
};
|
|
|
|
static LIST_HEAD(iio_map_list);
|
|
static DEFINE_MUTEX(iio_map_list_lock);
|
|
|
|
int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps)
|
|
{
|
|
int i = 0, ret = 0;
|
|
struct iio_map_internal *mapi;
|
|
|
|
if (maps == NULL)
|
|
return 0;
|
|
|
|
mutex_lock(&iio_map_list_lock);
|
|
while (maps[i].consumer_dev_name != NULL) {
|
|
mapi = kzalloc(sizeof(*mapi), GFP_KERNEL);
|
|
if (mapi == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
mapi->map = &maps[i];
|
|
mapi->indio_dev = indio_dev;
|
|
list_add(&mapi->l, &iio_map_list);
|
|
i++;
|
|
}
|
|
error_ret:
|
|
mutex_unlock(&iio_map_list_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_map_array_register);
|
|
|
|
|
|
/*
|
|
* Remove all map entries associated with the given iio device
|
|
*/
|
|
int iio_map_array_unregister(struct iio_dev *indio_dev)
|
|
{
|
|
int ret = -ENODEV;
|
|
struct iio_map_internal *mapi, *next;
|
|
|
|
mutex_lock(&iio_map_list_lock);
|
|
list_for_each_entry_safe(mapi, next, &iio_map_list, l) {
|
|
if (indio_dev == mapi->indio_dev) {
|
|
list_del(&mapi->l);
|
|
kfree(mapi);
|
|
ret = 0;
|
|
}
|
|
}
|
|
mutex_unlock(&iio_map_list_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_map_array_unregister);
|
|
|
|
static const struct iio_chan_spec
|
|
*iio_chan_spec_from_name(const struct iio_dev *indio_dev, const char *name)
|
|
{
|
|
int i;
|
|
const struct iio_chan_spec *chan = NULL;
|
|
|
|
for (i = 0; i < indio_dev->num_channels; i++)
|
|
if (indio_dev->channels[i].datasheet_name &&
|
|
strcmp(name, indio_dev->channels[i].datasheet_name) == 0) {
|
|
chan = &indio_dev->channels[i];
|
|
break;
|
|
}
|
|
return chan;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
|
|
static int iio_dev_node_match(struct device *dev, void *data)
|
|
{
|
|
return dev->of_node == data && dev->type == &iio_device_type;
|
|
}
|
|
|
|
/**
|
|
* __of_iio_simple_xlate - translate iiospec to the IIO channel index
|
|
* @indio_dev: pointer to the iio_dev structure
|
|
* @iiospec: IIO specifier as found in the device tree
|
|
*
|
|
* This is simple translation function, suitable for the most 1:1 mapped
|
|
* channels in IIO chips. This function performs only one sanity check:
|
|
* whether IIO index is less than num_channels (that is specified in the
|
|
* iio_dev).
|
|
*/
|
|
static int __of_iio_simple_xlate(struct iio_dev *indio_dev,
|
|
const struct of_phandle_args *iiospec)
|
|
{
|
|
if (!iiospec->args_count)
|
|
return 0;
|
|
|
|
if (iiospec->args[0] >= indio_dev->num_channels) {
|
|
dev_err(&indio_dev->dev, "invalid channel index %u\n",
|
|
iiospec->args[0]);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return iiospec->args[0];
|
|
}
|
|
|
|
static int __of_iio_channel_get(struct iio_channel *channel,
|
|
struct device_node *np, int index)
|
|
{
|
|
struct device *idev;
|
|
struct iio_dev *indio_dev;
|
|
int err;
|
|
struct of_phandle_args iiospec;
|
|
|
|
err = of_parse_phandle_with_args(np, "io-channels",
|
|
"#io-channel-cells",
|
|
index, &iiospec);
|
|
if (err)
|
|
return err;
|
|
|
|
idev = bus_find_device(&iio_bus_type, NULL, iiospec.np,
|
|
iio_dev_node_match);
|
|
of_node_put(iiospec.np);
|
|
if (idev == NULL)
|
|
return -EPROBE_DEFER;
|
|
|
|
indio_dev = dev_to_iio_dev(idev);
|
|
channel->indio_dev = indio_dev;
|
|
if (indio_dev->info->of_xlate)
|
|
index = indio_dev->info->of_xlate(indio_dev, &iiospec);
|
|
else
|
|
index = __of_iio_simple_xlate(indio_dev, &iiospec);
|
|
if (index < 0)
|
|
goto err_put;
|
|
channel->channel = &indio_dev->channels[index];
|
|
|
|
return 0;
|
|
|
|
err_put:
|
|
iio_device_put(indio_dev);
|
|
return index;
|
|
}
|
|
|
|
static struct iio_channel *of_iio_channel_get(struct device_node *np, int index)
|
|
{
|
|
struct iio_channel *channel;
|
|
int err;
|
|
|
|
if (index < 0)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
channel = kzalloc(sizeof(*channel), GFP_KERNEL);
|
|
if (channel == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
err = __of_iio_channel_get(channel, np, index);
|
|
if (err)
|
|
goto err_free_channel;
|
|
|
|
return channel;
|
|
|
|
err_free_channel:
|
|
kfree(channel);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct iio_channel *of_iio_channel_get_by_name(struct device_node *np,
|
|
const char *name)
|
|
{
|
|
struct iio_channel *chan = NULL;
|
|
|
|
/* Walk up the tree of devices looking for a matching iio channel */
|
|
while (np) {
|
|
int index = 0;
|
|
|
|
/*
|
|
* For named iio channels, first look up the name in the
|
|
* "io-channel-names" property. If it cannot be found, the
|
|
* index will be an error code, and of_iio_channel_get()
|
|
* will fail.
|
|
*/
|
|
if (name)
|
|
index = of_property_match_string(np, "io-channel-names",
|
|
name);
|
|
chan = of_iio_channel_get(np, index);
|
|
if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER)
|
|
break;
|
|
else if (name && index >= 0) {
|
|
pr_err("ERROR: could not get IIO channel %s:%s(%i)\n",
|
|
np->full_name, name ? name : "", index);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* No matching IIO channel found on this node.
|
|
* If the parent node has a "io-channel-ranges" property,
|
|
* then we can try one of its channels.
|
|
*/
|
|
np = np->parent;
|
|
if (np && !of_get_property(np, "io-channel-ranges", NULL))
|
|
return NULL;
|
|
}
|
|
|
|
return chan;
|
|
}
|
|
|
|
static struct iio_channel *of_iio_channel_get_all(struct device *dev)
|
|
{
|
|
struct iio_channel *chans;
|
|
int i, mapind, nummaps = 0;
|
|
int ret;
|
|
|
|
do {
|
|
ret = of_parse_phandle_with_args(dev->of_node,
|
|
"io-channels",
|
|
"#io-channel-cells",
|
|
nummaps, NULL);
|
|
if (ret < 0)
|
|
break;
|
|
} while (++nummaps);
|
|
|
|
if (nummaps == 0) /* no error, return NULL to search map table */
|
|
return NULL;
|
|
|
|
/* NULL terminated array to save passing size */
|
|
chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL);
|
|
if (chans == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* Search for OF matches */
|
|
for (mapind = 0; mapind < nummaps; mapind++) {
|
|
ret = __of_iio_channel_get(&chans[mapind], dev->of_node,
|
|
mapind);
|
|
if (ret)
|
|
goto error_free_chans;
|
|
}
|
|
return chans;
|
|
|
|
error_free_chans:
|
|
for (i = 0; i < mapind; i++)
|
|
iio_device_put(chans[i].indio_dev);
|
|
kfree(chans);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
#else /* CONFIG_OF */
|
|
|
|
static inline struct iio_channel *
|
|
of_iio_channel_get_by_name(struct device_node *np, const char *name)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct iio_channel *of_iio_channel_get_all(struct device *dev)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* CONFIG_OF */
|
|
|
|
static struct iio_channel *iio_channel_get_sys(const char *name,
|
|
const char *channel_name)
|
|
{
|
|
struct iio_map_internal *c_i = NULL, *c = NULL;
|
|
struct iio_channel *channel;
|
|
int err;
|
|
|
|
if (name == NULL && channel_name == NULL)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
/* first find matching entry the channel map */
|
|
mutex_lock(&iio_map_list_lock);
|
|
list_for_each_entry(c_i, &iio_map_list, l) {
|
|
if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) ||
|
|
(channel_name &&
|
|
strcmp(channel_name, c_i->map->consumer_channel) != 0))
|
|
continue;
|
|
c = c_i;
|
|
iio_device_get(c->indio_dev);
|
|
break;
|
|
}
|
|
mutex_unlock(&iio_map_list_lock);
|
|
if (c == NULL)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
channel = kzalloc(sizeof(*channel), GFP_KERNEL);
|
|
if (channel == NULL) {
|
|
err = -ENOMEM;
|
|
goto error_no_mem;
|
|
}
|
|
|
|
channel->indio_dev = c->indio_dev;
|
|
|
|
if (c->map->adc_channel_label) {
|
|
channel->channel =
|
|
iio_chan_spec_from_name(channel->indio_dev,
|
|
c->map->adc_channel_label);
|
|
|
|
if (channel->channel == NULL) {
|
|
err = -EINVAL;
|
|
goto error_no_chan;
|
|
}
|
|
}
|
|
|
|
return channel;
|
|
|
|
error_no_chan:
|
|
kfree(channel);
|
|
error_no_mem:
|
|
iio_device_put(c->indio_dev);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
struct iio_channel *iio_channel_get(struct device *dev,
|
|
const char *channel_name)
|
|
{
|
|
const char *name = dev ? dev_name(dev) : NULL;
|
|
struct iio_channel *channel;
|
|
|
|
if (dev) {
|
|
channel = of_iio_channel_get_by_name(dev->of_node,
|
|
channel_name);
|
|
if (channel != NULL)
|
|
return channel;
|
|
}
|
|
|
|
return iio_channel_get_sys(name, channel_name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_get);
|
|
|
|
void iio_channel_release(struct iio_channel *channel)
|
|
{
|
|
if (!channel)
|
|
return;
|
|
iio_device_put(channel->indio_dev);
|
|
kfree(channel);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_release);
|
|
|
|
static void devm_iio_channel_free(struct device *dev, void *res)
|
|
{
|
|
struct iio_channel *channel = *(struct iio_channel **)res;
|
|
|
|
iio_channel_release(channel);
|
|
}
|
|
|
|
static int devm_iio_channel_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct iio_channel **r = res;
|
|
|
|
if (!r || !*r) {
|
|
WARN_ON(!r || !*r);
|
|
return 0;
|
|
}
|
|
|
|
return *r == data;
|
|
}
|
|
|
|
struct iio_channel *devm_iio_channel_get(struct device *dev,
|
|
const char *channel_name)
|
|
{
|
|
struct iio_channel **ptr, *channel;
|
|
|
|
ptr = devres_alloc(devm_iio_channel_free, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
channel = iio_channel_get(dev, channel_name);
|
|
if (IS_ERR(channel)) {
|
|
devres_free(ptr);
|
|
return channel;
|
|
}
|
|
|
|
*ptr = channel;
|
|
devres_add(dev, ptr);
|
|
|
|
return channel;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_channel_get);
|
|
|
|
void devm_iio_channel_release(struct device *dev, struct iio_channel *channel)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_iio_channel_free,
|
|
devm_iio_channel_match, channel));
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_channel_release);
|
|
|
|
struct iio_channel *iio_channel_get_all(struct device *dev)
|
|
{
|
|
const char *name;
|
|
struct iio_channel *chans;
|
|
struct iio_map_internal *c = NULL;
|
|
int nummaps = 0;
|
|
int mapind = 0;
|
|
int i, ret;
|
|
|
|
if (dev == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
chans = of_iio_channel_get_all(dev);
|
|
if (chans)
|
|
return chans;
|
|
|
|
name = dev_name(dev);
|
|
|
|
mutex_lock(&iio_map_list_lock);
|
|
/* first count the matching maps */
|
|
list_for_each_entry(c, &iio_map_list, l)
|
|
if (name && strcmp(name, c->map->consumer_dev_name) != 0)
|
|
continue;
|
|
else
|
|
nummaps++;
|
|
|
|
if (nummaps == 0) {
|
|
ret = -ENODEV;
|
|
goto error_ret;
|
|
}
|
|
|
|
/* NULL terminated array to save passing size */
|
|
chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL);
|
|
if (chans == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
|
|
/* for each map fill in the chans element */
|
|
list_for_each_entry(c, &iio_map_list, l) {
|
|
if (name && strcmp(name, c->map->consumer_dev_name) != 0)
|
|
continue;
|
|
chans[mapind].indio_dev = c->indio_dev;
|
|
chans[mapind].data = c->map->consumer_data;
|
|
chans[mapind].channel =
|
|
iio_chan_spec_from_name(chans[mapind].indio_dev,
|
|
c->map->adc_channel_label);
|
|
if (chans[mapind].channel == NULL) {
|
|
ret = -EINVAL;
|
|
goto error_free_chans;
|
|
}
|
|
iio_device_get(chans[mapind].indio_dev);
|
|
mapind++;
|
|
}
|
|
if (mapind == 0) {
|
|
ret = -ENODEV;
|
|
goto error_free_chans;
|
|
}
|
|
mutex_unlock(&iio_map_list_lock);
|
|
|
|
return chans;
|
|
|
|
error_free_chans:
|
|
for (i = 0; i < nummaps; i++)
|
|
iio_device_put(chans[i].indio_dev);
|
|
kfree(chans);
|
|
error_ret:
|
|
mutex_unlock(&iio_map_list_lock);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_get_all);
|
|
|
|
void iio_channel_release_all(struct iio_channel *channels)
|
|
{
|
|
struct iio_channel *chan = &channels[0];
|
|
|
|
while (chan->indio_dev) {
|
|
iio_device_put(chan->indio_dev);
|
|
chan++;
|
|
}
|
|
kfree(channels);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_release_all);
|
|
|
|
static void devm_iio_channel_free_all(struct device *dev, void *res)
|
|
{
|
|
struct iio_channel *channels = *(struct iio_channel **)res;
|
|
|
|
iio_channel_release_all(channels);
|
|
}
|
|
|
|
struct iio_channel *devm_iio_channel_get_all(struct device *dev)
|
|
{
|
|
struct iio_channel **ptr, *channels;
|
|
|
|
ptr = devres_alloc(devm_iio_channel_free_all, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
channels = iio_channel_get_all(dev);
|
|
if (IS_ERR(channels)) {
|
|
devres_free(ptr);
|
|
return channels;
|
|
}
|
|
|
|
*ptr = channels;
|
|
devres_add(dev, ptr);
|
|
|
|
return channels;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_channel_get_all);
|
|
|
|
void devm_iio_channel_release_all(struct device *dev,
|
|
struct iio_channel *channels)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_iio_channel_free_all,
|
|
devm_iio_channel_match, channels));
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_channel_release_all);
|
|
|
|
static int iio_channel_read(struct iio_channel *chan, int *val, int *val2,
|
|
enum iio_chan_info_enum info)
|
|
{
|
|
int unused;
|
|
int vals[INDIO_MAX_RAW_ELEMENTS];
|
|
int ret;
|
|
int val_len = 2;
|
|
|
|
if (val2 == NULL)
|
|
val2 = &unused;
|
|
|
|
if (!iio_channel_has_info(chan->channel, info))
|
|
return -EINVAL;
|
|
|
|
if (chan->indio_dev->info->read_raw_multi) {
|
|
ret = chan->indio_dev->info->read_raw_multi(chan->indio_dev,
|
|
chan->channel, INDIO_MAX_RAW_ELEMENTS,
|
|
vals, &val_len, info);
|
|
*val = vals[0];
|
|
*val2 = vals[1];
|
|
} else
|
|
ret = chan->indio_dev->info->read_raw(chan->indio_dev,
|
|
chan->channel, val, val2, info);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int iio_read_channel_raw(struct iio_channel *chan, int *val)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (chan->indio_dev->info == NULL) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_read_channel_raw);
|
|
|
|
int iio_read_channel_average_raw(struct iio_channel *chan, int *val)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (chan->indio_dev->info == NULL) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW);
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_read_channel_average_raw);
|
|
|
|
static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,
|
|
int raw, int *processed, unsigned int scale)
|
|
{
|
|
int scale_type, scale_val, scale_val2, offset;
|
|
s64 raw64 = raw;
|
|
int ret;
|
|
|
|
ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_OFFSET);
|
|
if (ret >= 0)
|
|
raw64 += offset;
|
|
|
|
scale_type = iio_channel_read(chan, &scale_val, &scale_val2,
|
|
IIO_CHAN_INFO_SCALE);
|
|
if (scale_type < 0) {
|
|
/*
|
|
* Just pass raw values as processed if no scaling is
|
|
* available.
|
|
*/
|
|
*processed = raw;
|
|
return 0;
|
|
}
|
|
|
|
switch (scale_type) {
|
|
case IIO_VAL_INT:
|
|
*processed = raw64 * scale_val;
|
|
break;
|
|
case IIO_VAL_INT_PLUS_MICRO:
|
|
if (scale_val2 < 0)
|
|
*processed = -raw64 * scale_val;
|
|
else
|
|
*processed = raw64 * scale_val;
|
|
*processed += div_s64(raw64 * (s64)scale_val2 * scale,
|
|
1000000LL);
|
|
break;
|
|
case IIO_VAL_INT_PLUS_NANO:
|
|
if (scale_val2 < 0)
|
|
*processed = -raw64 * scale_val;
|
|
else
|
|
*processed = raw64 * scale_val;
|
|
*processed += div_s64(raw64 * (s64)scale_val2 * scale,
|
|
1000000000LL);
|
|
break;
|
|
case IIO_VAL_FRACTIONAL:
|
|
*processed = div_s64(raw64 * (s64)scale_val * scale,
|
|
scale_val2);
|
|
break;
|
|
case IIO_VAL_FRACTIONAL_LOG2:
|
|
*processed = (raw64 * (s64)scale_val * scale) >> scale_val2;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int iio_convert_raw_to_processed(struct iio_channel *chan, int raw,
|
|
int *processed, unsigned int scale)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (chan->indio_dev->info == NULL) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_convert_raw_to_processed_unlocked(chan, raw, processed,
|
|
scale);
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed);
|
|
|
|
static int iio_read_channel_attribute(struct iio_channel *chan,
|
|
int *val, int *val2,
|
|
enum iio_chan_info_enum attribute)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (chan->indio_dev->info == NULL) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read(chan, val, val2, attribute);
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int iio_read_channel_offset(struct iio_channel *chan, int *val, int *val2)
|
|
{
|
|
return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_OFFSET);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_read_channel_offset);
|
|
|
|
int iio_read_channel_processed(struct iio_channel *chan, int *val)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (chan->indio_dev->info == NULL) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) {
|
|
ret = iio_channel_read(chan, val, NULL,
|
|
IIO_CHAN_INFO_PROCESSED);
|
|
} else {
|
|
ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
|
|
if (ret < 0)
|
|
goto err_unlock;
|
|
ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1);
|
|
}
|
|
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_read_channel_processed);
|
|
|
|
int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2)
|
|
{
|
|
return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_SCALE);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_read_channel_scale);
|
|
|
|
static int iio_channel_read_avail(struct iio_channel *chan,
|
|
const int **vals, int *type, int *length,
|
|
enum iio_chan_info_enum info)
|
|
{
|
|
if (!iio_channel_has_available(chan->channel, info))
|
|
return -EINVAL;
|
|
|
|
return chan->indio_dev->info->read_avail(chan->indio_dev, chan->channel,
|
|
vals, type, length, info);
|
|
}
|
|
|
|
int iio_read_avail_channel_raw(struct iio_channel *chan,
|
|
const int **vals, int *length)
|
|
{
|
|
int ret;
|
|
int type;
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read_avail(chan,
|
|
vals, &type, length, IIO_CHAN_INFO_RAW);
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
if (ret >= 0 && type != IIO_VAL_INT)
|
|
/* raw values are assumed to be IIO_VAL_INT */
|
|
ret = -EINVAL;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_read_avail_channel_raw);
|
|
|
|
static int iio_channel_read_max(struct iio_channel *chan,
|
|
int *val, int *val2, int *type,
|
|
enum iio_chan_info_enum info)
|
|
{
|
|
int unused;
|
|
const int *vals;
|
|
int length;
|
|
int ret;
|
|
|
|
if (!val2)
|
|
val2 = &unused;
|
|
|
|
ret = iio_channel_read_avail(chan, &vals, type, &length, info);
|
|
switch (ret) {
|
|
case IIO_AVAIL_RANGE:
|
|
switch (*type) {
|
|
case IIO_VAL_INT:
|
|
*val = vals[2];
|
|
break;
|
|
default:
|
|
*val = vals[4];
|
|
*val2 = vals[5];
|
|
}
|
|
return 0;
|
|
|
|
case IIO_AVAIL_LIST:
|
|
if (length <= 0)
|
|
return -EINVAL;
|
|
switch (*type) {
|
|
case IIO_VAL_INT:
|
|
*val = vals[--length];
|
|
while (length) {
|
|
if (vals[--length] > *val)
|
|
*val = vals[length];
|
|
}
|
|
break;
|
|
default:
|
|
/* FIXME: learn about max for other iio values */
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
|
|
default:
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
int iio_read_max_channel_raw(struct iio_channel *chan, int *val)
|
|
{
|
|
int ret;
|
|
int type;
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read_max(chan, val, NULL, &type, IIO_CHAN_INFO_RAW);
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_read_max_channel_raw);
|
|
|
|
int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type)
|
|
{
|
|
int ret = 0;
|
|
/* Need to verify underlying driver has not gone away */
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (chan->indio_dev->info == NULL) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
*type = chan->channel->type;
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_get_channel_type);
|
|
|
|
static int iio_channel_write(struct iio_channel *chan, int val, int val2,
|
|
enum iio_chan_info_enum info)
|
|
{
|
|
return chan->indio_dev->info->write_raw(chan->indio_dev,
|
|
chan->channel, val, val2, info);
|
|
}
|
|
|
|
int iio_write_channel_raw(struct iio_channel *chan, int val)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&chan->indio_dev->info_exist_lock);
|
|
if (chan->indio_dev->info == NULL) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_write(chan, val, 0, IIO_CHAN_INFO_RAW);
|
|
err_unlock:
|
|
mutex_unlock(&chan->indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_write_channel_raw);
|