// SPDX-License-Identifier: GPL-2.0-only
/* The industrial I/O core in kernel channel mapping
*
* Copyright (c) 2011 Jonathan Cameron
*/
#include <linux/cleanup.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/minmax.h>
#include <linux/mutex.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/iio/iio.h>
#include <linux/iio/iio-opaque.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);
static int iio_map_array_unregister_locked(struct iio_dev *indio_dev)
{
int ret = -ENODEV;
struct iio_map_internal *mapi, *next;
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;
}
}
return ret;
}
int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps)
{
struct iio_map_internal *mapi;
int i = 0;
int ret;
if (!maps)
return 0;
guard(mutex)(&iio_map_list_lock);
while (maps[i].consumer_dev_name) {
mapi = kzalloc(sizeof(*mapi), GFP_KERNEL);
if (!mapi) {
ret = -ENOMEM;
goto error_ret;
}
mapi->map = &maps[i];
mapi->indio_dev = indio_dev;
list_add_tail(&mapi->l, &iio_map_list);
i++;
}
return 0;
error_ret:
iio_map_array_unregister_locked(indio_dev);
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)
{
guard(mutex)(&iio_map_list_lock);
return iio_map_array_unregister_locked(indio_dev);
}
EXPORT_SYMBOL_GPL(iio_map_array_unregister);
static void iio_map_array_unregister_cb(void *indio_dev)
{
iio_map_array_unregister(indio_dev);
}
int devm_iio_map_array_register(struct device *dev, struct iio_dev *indio_dev, struct iio_map *maps)
{
int ret;
ret = iio_map_array_register(indio_dev, maps);
if (ret)
return ret;
return devm_add_action_or_reset(dev, iio_map_array_unregister_cb, indio_dev);
}
EXPORT_SYMBOL_GPL(devm_iio_map_array_register);
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;
}
/**
* __fwnode_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 __fwnode_iio_simple_xlate(struct iio_dev *indio_dev,
const struct fwnode_reference_args *iiospec)
{
if (!iiospec->nargs)
return 0;
if (iiospec->args[0] >= indio_dev->num_channels) {
dev_err(&indio_dev->dev, "invalid channel index %llu\n",
iiospec->args[0]);
return -EINVAL;
}
return iiospec->args[0];
}
static int __fwnode_iio_channel_get(struct iio_channel *channel,
struct fwnode_handle *fwnode, int index)
{
struct fwnode_reference_args iiospec;
struct device *idev;
struct iio_dev *indio_dev;
int err;
err = fwnode_property_get_reference_args(fwnode, "io-channels",
"#io-channel-cells", 0,
index, &iiospec);
if (err)
return err;
idev = bus_find_device_by_fwnode(&iio_bus_type, iiospec.fwnode);
if (!idev) {
fwnode_handle_put(iiospec.fwnode);
return -EPROBE_DEFER;
}
indio_dev = dev_to_iio_dev(idev);
channel->indio_dev = indio_dev;
if (indio_dev->info->fwnode_xlate)
index = indio_dev->info->fwnode_xlate(indio_dev, &iiospec);
else
index = __fwnode_iio_simple_xlate(indio_dev, &iiospec);
fwnode_handle_put(iiospec.fwnode);
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 *fwnode_iio_channel_get(struct fwnode_handle *fwnode,
int index)
{
int err;
if (index < 0)
return ERR_PTR(-EINVAL);
struct iio_channel *channel __free(kfree) =
kzalloc(sizeof(*channel), GFP_KERNEL);
if (!channel)
return ERR_PTR(-ENOMEM);
err = __fwnode_iio_channel_get(channel, fwnode, index);
if (err)
return ERR_PTR(err);
return_ptr(channel);
}
static struct iio_channel *
__fwnode_iio_channel_get_by_name(struct fwnode_handle *fwnode, const char *name)
{
struct iio_channel *chan;
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 fwnode_iio_channel_get()
* will fail.
*/
if (name)
index = fwnode_property_match_string(fwnode, "io-channel-names",
name);
chan = fwnode_iio_channel_get(fwnode, index);
if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER)
return chan;
if (name) {
if (index >= 0) {
pr_err("ERROR: could not get IIO channel %pfw:%s(%i)\n",
fwnode, name, index);
/*
* In this case, we found 'name' in 'io-channel-names'
* but somehow we still fail so that we should not proceed
* with any other lookup. Hence, explicitly return -EINVAL
* (maybe not the better error code) so that the caller
* won't do a system lookup.
*/
return ERR_PTR(-EINVAL);
}
/*
* If index < 0, then fwnode_property_get_reference_args() fails
* with -EINVAL or -ENOENT (ACPI case) which is expected. We
* should not proceed if we get any other error.
*/
if (PTR_ERR(chan) != -EINVAL && PTR_ERR(chan) != -ENOENT)
return chan;
} else if (PTR_ERR(chan) != -ENOENT) {
/*
* if !name, then we should only proceed the lookup if
* fwnode_property_get_reference_args() returns -ENOENT.
*/
return chan;
}
/* so we continue the lookup */
return ERR_PTR(-ENODEV);
}
struct iio_channel *fwnode_iio_channel_get_by_name(struct fwnode_handle *fwnode,
const char *name)
{
struct fwnode_handle *parent;
struct iio_channel *chan;
/* Walk up the tree of devices looking for a matching iio channel */
chan = __fwnode_iio_channel_get_by_name(fwnode, name);
if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV)
return chan;
/*
* 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.
*/
fwnode_for_each_parent_node(fwnode, parent) {
if (!fwnode_property_present(parent, "io-channel-ranges")) {
fwnode_handle_put(parent);
return ERR_PTR(-ENODEV);
}
chan = __fwnode_iio_channel_get_by_name(fwnode, name);
if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV) {
fwnode_handle_put(parent);
return chan;
}
}
return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL_GPL(fwnode_iio_channel_get_by_name);
static struct iio_channel *fwnode_iio_channel_get_all(struct device *dev)
{
struct fwnode_handle *fwnode = dev_fwnode(dev);
int i, mapind, nummaps = 0;
int ret;
do {
ret = fwnode_property_get_reference_args(fwnode, "io-channels",
"#io-channel-cells", 0,
nummaps, NULL);
if (ret < 0)
break;
} while (++nummaps);
if (nummaps == 0)
return ERR_PTR(-ENODEV);
/* NULL terminated array to save passing size */
struct iio_channel *chans __free(kfree) =
kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL);
if (!chans)
return ERR_PTR(-ENOMEM);
/* Search for FW matches */
for (mapind = 0; mapind < nummaps; mapind++) {
ret = __fwnode_iio_channel_get(&chans[mapind], fwnode, mapind);
if (ret)
goto error_free_chans;
}
return_ptr(chans);
error_free_chans:
for (i = 0; i < mapind; i++)
iio_device_put(chans[i].indio_dev);
return ERR_PTR(ret);
}
static struct iio_channel *iio_channel_get_sys(const char *name,
const char *channel_name)
{
struct iio_map_internal *c_i = NULL, *c = NULL;
int err;
if (!(name || channel_name))
return ERR_PTR(-ENODEV);
/* first find matching entry the channel map */
scoped_guard(mutex, &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;
}
}
if (!c)
return ERR_PTR(-ENODEV);
struct iio_channel *channel __free(kfree) =
kzalloc(sizeof(*channel), GFP_KERNEL);
if (!channel) {
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) {
err = -EINVAL;
goto error_no_mem;
}
}
return_ptr(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 = fwnode_iio_channel_get_by_name(dev_fwnode(dev),
channel_name);
if (!IS_ERR(channel) || PTR_ERR(channel) != -ENODEV)
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(void *iio_channel)
{
iio_channel_release(iio_channel);
}
struct iio_channel *devm_iio_channel_get(struct device *dev,
const char *channel_name)
{
struct iio_channel *channel;
int ret;
channel = iio_channel_get(dev, channel_name);
if (IS_ERR(channel))
return channel;
ret = devm_add_action_or_reset(dev, devm_iio_channel_free, channel);
if (ret)
return ERR_PTR(ret);
return channel;
}
EXPORT_SYMBOL_GPL(devm_iio_channel_get);
struct iio_channel *devm_fwnode_iio_channel_get_by_name(struct device *dev,
struct fwnode_handle *fwnode,
const char *channel_name)
{
struct iio_channel *channel;
int ret;
channel = fwnode_iio_channel_get_by_name(fwnode, channel_name);
if (IS_ERR(channel))
return channel;
ret = devm_add_action_or_reset(dev, devm_iio_channel_free, channel);
if (ret)
return ERR_PTR(ret);
return channel;
}
EXPORT_SYMBOL_GPL(devm_fwnode_iio_channel_get_by_name);
struct iio_channel *iio_channel_get_all(struct device *dev)
{
const char *name;
struct iio_map_internal *c = NULL;
struct iio_channel *fw_chans;
int nummaps = 0;
int mapind = 0;
int i, ret;
if (!dev)
return ERR_PTR(-EINVAL);
fw_chans = fwnode_iio_channel_get_all(dev);
/*
* We only want to carry on if the error is -ENODEV. Anything else
* should be reported up the stack.
*/
if (!IS_ERR(fw_chans) || PTR_ERR(fw_chans) != -ENODEV)
return fw_chans;
name = dev_name(dev);
guard(mutex)(&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)
return ERR_PTR(-ENODEV);
/* NULL terminated array to save passing size */
struct iio_channel *chans __free(kfree) =
kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL);
if (!chans)
return ERR_PTR(-ENOMEM);
/* 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) {
ret = -EINVAL;
goto error_free_chans;
}
iio_device_get(chans[mapind].indio_dev);
mapind++;
}
if (mapind == 0) {
ret = -ENODEV;
goto error_free_chans;
}
return_ptr(chans);
error_free_chans:
for (i = 0; i < nummaps; i++)
iio_device_put(chans[i].indio_dev);
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(void *iio_channels)
{
iio_channel_release_all(iio_channels);
}
struct iio_channel *devm_iio_channel_get_all(struct device *dev)
{
struct iio_channel *channels;
int ret;
channels = iio_channel_get_all(dev);
if (IS_ERR(channels))
return channels;
ret = devm_add_action_or_reset(dev, devm_iio_channel_free_all,
channels);
if (ret)
return ERR_PTR(ret);
return channels;
}
EXPORT_SYMBOL_GPL(devm_iio_channel_get_all);
static int iio_channel_read(struct iio_channel *chan, int *val, int *val2,
enum iio_chan_info_enum info)
{
const struct iio_info *iio_info = chan->indio_dev->info;
int unused;
int vals[INDIO_MAX_RAW_ELEMENTS];
int ret;
int val_len = 2;
if (!val2)
val2 = &unused;
if (!iio_channel_has_info(chan->channel, info))
return -EINVAL;
if (iio_info->read_raw_multi) {
ret = iio_info->read_raw_multi(chan->indio_dev,
chan->channel,
INDIO_MAX_RAW_ELEMENTS,
vals, &val_len, info);
*val = vals[0];
*val2 = vals[1];
} else if (iio_info->read_raw) {
ret = iio_info->read_raw(chan->indio_dev,
chan->channel, val, val2, info);
} else {
return -EINVAL;
}
return ret;
}
int iio_read_channel_raw(struct iio_channel *chan, int *val)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
return iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
}
EXPORT_SYMBOL_GPL(iio_read_channel_raw);
int iio_read_channel_average_raw(struct iio_channel *chan, int *val)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
return iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW);
}
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;
int offset_type, offset_val, offset_val2;
s64 raw64 = raw;
offset_type = iio_channel_read(chan, &offset_val, &offset_val2,
IIO_CHAN_INFO_OFFSET);
if (offset_type >= 0) {
switch (offset_type) {
case IIO_VAL_INT:
break;
case IIO_VAL_INT_PLUS_MICRO:
case IIO_VAL_INT_PLUS_NANO:
/*
* Both IIO_VAL_INT_PLUS_MICRO and IIO_VAL_INT_PLUS_NANO
* implicitely truncate the offset to it's integer form.
*/
break;
case IIO_VAL_FRACTIONAL:
offset_val /= offset_val2;
break;
case IIO_VAL_FRACTIONAL_LOG2:
offset_val >>= offset_val2;
break;
default:
return -EINVAL;
}
raw64 += offset_val;
}
scale_type = iio_channel_read(chan, &scale_val, &scale_val2,
IIO_CHAN_INFO_SCALE);
if (scale_type < 0) {
/*
* If no channel scaling is available apply consumer scale to
* raw value and return.
*/
*processed = raw * scale;
return 0;
}
switch (scale_type) {
case IIO_VAL_INT:
*processed = raw64 * scale_val * scale;
break;
case IIO_VAL_INT_PLUS_MICRO:
if (scale_val2 < 0)
*processed = -raw64 * scale_val * scale;
else
*processed = raw64 * scale_val * scale;
*processed += div_s64(raw64 * (s64)scale_val2 * scale,
1000000LL);
break;
case IIO_VAL_INT_PLUS_NANO:
if (scale_val2 < 0)
*processed = -raw64 * scale_val * scale;
else
*processed = raw64 * scale_val * scale;
*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)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
return iio_convert_raw_to_processed_unlocked(chan, raw, processed,
scale);
}
EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed);
int iio_read_channel_attribute(struct iio_channel *chan, int *val, int *val2,
enum iio_chan_info_enum attribute)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
return iio_channel_read(chan, val, val2, attribute);
}
EXPORT_SYMBOL_GPL(iio_read_channel_attribute);
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_scale(struct iio_channel *chan, int *val,
unsigned int scale)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
int ret;
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) {
ret = iio_channel_read(chan, val, NULL,
IIO_CHAN_INFO_PROCESSED);
if (ret < 0)
return ret;
*val *= scale;
return ret;
} else {
ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
if (ret < 0)
return ret;
return iio_convert_raw_to_processed_unlocked(chan, *val, val,
scale);
}
}
EXPORT_SYMBOL_GPL(iio_read_channel_processed_scale);
int iio_read_channel_processed(struct iio_channel *chan, int *val)
{
/* This is just a special case with scale factor 1 */
return iio_read_channel_processed_scale(chan, val, 1);
}
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)
{
const struct iio_info *iio_info = chan->indio_dev->info;
if (!iio_channel_has_available(chan->channel, info))
return -EINVAL;
if (iio_info->read_avail)
return iio_info->read_avail(chan->indio_dev, chan->channel,
vals, type, length, info);
return -EINVAL;
}
int iio_read_avail_channel_attribute(struct iio_channel *chan,
const int **vals, int *type, int *length,
enum iio_chan_info_enum attribute)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
return iio_channel_read_avail(chan, vals, type, length, attribute);
}
EXPORT_SYMBOL_GPL(iio_read_avail_channel_attribute);
int iio_read_avail_channel_raw(struct iio_channel *chan,
const int **vals, int *length)
{
int ret;
int type;
ret = iio_read_avail_channel_attribute(chan, vals, &type, length,
IIO_CHAN_INFO_RAW);
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)
{
const int *vals;
int length;
int ret;
ret = iio_channel_read_avail(chan, &vals, type, &length, info);
if (ret < 0)
return ret;
switch (ret) {
case IIO_AVAIL_RANGE:
switch (*type) {
case IIO_VAL_INT:
*val = vals[2];
break;
default:
*val = vals[4];
if (val2)
*val2 = vals[5];
}
return 0;
case IIO_AVAIL_LIST:
if (length <= 0)
return -EINVAL;
switch (*type) {
case IIO_VAL_INT:
*val = max_array(vals, length);
break;
default:
/* TODO: learn about max for other iio values */
return -EINVAL;
}
return 0;
default:
return -EINVAL;
}
}
int iio_read_max_channel_raw(struct iio_channel *chan, int *val)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
int type;
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
return iio_channel_read_max(chan, val, NULL, &type, IIO_CHAN_INFO_RAW);
}
EXPORT_SYMBOL_GPL(iio_read_max_channel_raw);
static int iio_channel_read_min(struct iio_channel *chan,
int *val, int *val2, int *type,
enum iio_chan_info_enum info)
{
const int *vals;
int length;
int ret;
ret = iio_channel_read_avail(chan, &vals, type, &length, info);
if (ret < 0)
return ret;
switch (ret) {
case IIO_AVAIL_RANGE:
switch (*type) {
case IIO_VAL_INT:
*val = vals[0];
break;
default:
*val = vals[0];
if (val2)
*val2 = vals[1];
}
return 0;
case IIO_AVAIL_LIST:
if (length <= 0)
return -EINVAL;
switch (*type) {
case IIO_VAL_INT:
*val = min_array(vals, length);
break;
default:
/* TODO: learn about min for other iio values */
return -EINVAL;
}
return 0;
default:
return -EINVAL;
}
}
int iio_read_min_channel_raw(struct iio_channel *chan, int *val)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
int type;
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
return iio_channel_read_min(chan, val, NULL, &type, IIO_CHAN_INFO_RAW);
}
EXPORT_SYMBOL_GPL(iio_read_min_channel_raw);
int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
*type = chan->channel->type;
return 0;
}
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)
{
const struct iio_info *iio_info = chan->indio_dev->info;
if (iio_info->write_raw)
return iio_info->write_raw(chan->indio_dev,
chan->channel, val, val2, info);
return -EINVAL;
}
int iio_write_channel_attribute(struct iio_channel *chan, int val, int val2,
enum iio_chan_info_enum attribute)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
guard(mutex)(&iio_dev_opaque->info_exist_lock);
if (!chan->indio_dev->info)
return -ENODEV;
return iio_channel_write(chan, val, val2, attribute);
}
EXPORT_SYMBOL_GPL(iio_write_channel_attribute);
int iio_write_channel_raw(struct iio_channel *chan, int val)
{
return iio_write_channel_attribute(chan, val, 0, IIO_CHAN_INFO_RAW);
}
EXPORT_SYMBOL_GPL(iio_write_channel_raw);
unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan)
{
const struct iio_chan_spec_ext_info *ext_info;
unsigned int i = 0;
if (!chan->channel->ext_info)
return i;
for (ext_info = chan->channel->ext_info; ext_info->name; ext_info++)
++i;
return i;
}
EXPORT_SYMBOL_GPL(iio_get_channel_ext_info_count);
static const struct iio_chan_spec_ext_info *
iio_lookup_ext_info(const struct iio_channel *chan, const char *attr)
{
const struct iio_chan_spec_ext_info *ext_info;
if (!chan->channel->ext_info)
return NULL;
for (ext_info = chan->channel->ext_info; ext_info->name; ++ext_info) {
if (!strcmp(attr, ext_info->name))
return ext_info;
}
return NULL;
}
ssize_t iio_read_channel_ext_info(struct iio_channel *chan,
const char *attr, char *buf)
{
const struct iio_chan_spec_ext_info *ext_info;
ext_info = iio_lookup_ext_info(chan, attr);
if (!ext_info)
return -EINVAL;
return ext_info->read(chan->indio_dev, ext_info->private,
chan->channel, buf);
}
EXPORT_SYMBOL_GPL(iio_read_channel_ext_info);
ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr,
const char *buf, size_t len)
{
const struct iio_chan_spec_ext_info *ext_info;
ext_info = iio_lookup_ext_info(chan, attr);
if (!ext_info)
return -EINVAL;
return ext_info->write(chan->indio_dev, ext_info->private,
chan->channel, buf, len);
}
EXPORT_SYMBOL_GPL(iio_write_channel_ext_info);
ssize_t iio_read_channel_label(struct iio_channel *chan, char *buf)
{
return do_iio_read_channel_label(chan->indio_dev, chan->channel, buf);
}
EXPORT_SYMBOL_GPL(iio_read_channel_label);
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