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![Nuno Sá](/assets/img/avatar_default.png)
Just cosmetics. No functional change intended... Signed-off-by: Nuno Sá <nuno.sa@analog.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20220715122903.332535-16-nuno.sa@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
1025 lines
24 KiB
C
1025 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* The industrial I/O core in kernel channel mapping
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*
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* Copyright (c) 2011 Jonathan Cameron
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*/
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/iio-opaque.h>
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#include "iio_core.h"
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#include <linux/iio/machine.h>
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#include <linux/iio/driver.h>
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#include <linux/iio/consumer.h>
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struct iio_map_internal {
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struct iio_dev *indio_dev;
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struct iio_map *map;
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struct list_head l;
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};
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static LIST_HEAD(iio_map_list);
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static DEFINE_MUTEX(iio_map_list_lock);
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static int iio_map_array_unregister_locked(struct iio_dev *indio_dev)
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{
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int ret = -ENODEV;
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struct iio_map_internal *mapi, *next;
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list_for_each_entry_safe(mapi, next, &iio_map_list, l) {
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if (indio_dev == mapi->indio_dev) {
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list_del(&mapi->l);
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kfree(mapi);
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ret = 0;
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}
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}
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return ret;
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}
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int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps)
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{
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int i = 0, ret = 0;
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struct iio_map_internal *mapi;
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if (!maps)
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return 0;
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mutex_lock(&iio_map_list_lock);
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while (maps[i].consumer_dev_name) {
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mapi = kzalloc(sizeof(*mapi), GFP_KERNEL);
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if (!mapi) {
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ret = -ENOMEM;
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goto error_ret;
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}
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mapi->map = &maps[i];
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mapi->indio_dev = indio_dev;
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list_add_tail(&mapi->l, &iio_map_list);
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i++;
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}
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error_ret:
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if (ret)
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iio_map_array_unregister_locked(indio_dev);
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mutex_unlock(&iio_map_list_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iio_map_array_register);
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/*
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* Remove all map entries associated with the given iio device
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*/
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int iio_map_array_unregister(struct iio_dev *indio_dev)
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{
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int ret;
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mutex_lock(&iio_map_list_lock);
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ret = iio_map_array_unregister_locked(indio_dev);
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mutex_unlock(&iio_map_list_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iio_map_array_unregister);
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static void iio_map_array_unregister_cb(void *indio_dev)
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{
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iio_map_array_unregister(indio_dev);
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}
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int devm_iio_map_array_register(struct device *dev, struct iio_dev *indio_dev, struct iio_map *maps)
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{
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int ret;
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ret = iio_map_array_register(indio_dev, maps);
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if (ret)
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return ret;
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return devm_add_action_or_reset(dev, iio_map_array_unregister_cb, indio_dev);
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}
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EXPORT_SYMBOL_GPL(devm_iio_map_array_register);
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static const struct iio_chan_spec
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*iio_chan_spec_from_name(const struct iio_dev *indio_dev, const char *name)
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{
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int i;
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const struct iio_chan_spec *chan = NULL;
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for (i = 0; i < indio_dev->num_channels; i++)
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if (indio_dev->channels[i].datasheet_name &&
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strcmp(name, indio_dev->channels[i].datasheet_name) == 0) {
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chan = &indio_dev->channels[i];
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break;
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}
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return chan;
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}
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/**
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* __fwnode_iio_simple_xlate - translate iiospec to the IIO channel index
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* @indio_dev: pointer to the iio_dev structure
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* @iiospec: IIO specifier as found in the device tree
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*
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* This is simple translation function, suitable for the most 1:1 mapped
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* channels in IIO chips. This function performs only one sanity check:
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* whether IIO index is less than num_channels (that is specified in the
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* iio_dev).
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*/
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static int __fwnode_iio_simple_xlate(struct iio_dev *indio_dev,
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const struct fwnode_reference_args *iiospec)
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{
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if (!iiospec->nargs)
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return 0;
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if (iiospec->args[0] >= indio_dev->num_channels) {
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dev_err(&indio_dev->dev, "invalid channel index %llu\n",
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iiospec->args[0]);
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return -EINVAL;
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}
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return iiospec->args[0];
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}
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static int __fwnode_iio_channel_get(struct iio_channel *channel,
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struct fwnode_handle *fwnode, int index)
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{
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struct fwnode_reference_args iiospec;
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struct device *idev;
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struct iio_dev *indio_dev;
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int err;
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err = fwnode_property_get_reference_args(fwnode, "io-channels",
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"#io-channel-cells", 0,
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index, &iiospec);
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if (err)
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return err;
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idev = bus_find_device_by_fwnode(&iio_bus_type, iiospec.fwnode);
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if (!idev) {
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fwnode_handle_put(iiospec.fwnode);
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return -EPROBE_DEFER;
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}
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indio_dev = dev_to_iio_dev(idev);
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channel->indio_dev = indio_dev;
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if (indio_dev->info->fwnode_xlate)
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index = indio_dev->info->fwnode_xlate(indio_dev, &iiospec);
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else
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index = __fwnode_iio_simple_xlate(indio_dev, &iiospec);
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fwnode_handle_put(iiospec.fwnode);
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if (index < 0)
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goto err_put;
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channel->channel = &indio_dev->channels[index];
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return 0;
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err_put:
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iio_device_put(indio_dev);
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return index;
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}
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static struct iio_channel *fwnode_iio_channel_get(struct fwnode_handle *fwnode,
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int index)
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{
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struct iio_channel *channel;
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int err;
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if (index < 0)
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return ERR_PTR(-EINVAL);
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channel = kzalloc(sizeof(*channel), GFP_KERNEL);
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if (!channel)
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return ERR_PTR(-ENOMEM);
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err = __fwnode_iio_channel_get(channel, fwnode, index);
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if (err)
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goto err_free_channel;
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return channel;
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err_free_channel:
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kfree(channel);
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return ERR_PTR(err);
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}
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static struct iio_channel *
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__fwnode_iio_channel_get_by_name(struct fwnode_handle *fwnode, const char *name)
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{
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struct iio_channel *chan;
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int index = 0;
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/*
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* For named iio channels, first look up the name in the
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* "io-channel-names" property. If it cannot be found, the
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* index will be an error code, and fwnode_iio_channel_get()
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* will fail.
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*/
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if (name)
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index = fwnode_property_match_string(fwnode, "io-channel-names",
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name);
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chan = fwnode_iio_channel_get(fwnode, index);
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if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER)
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return chan;
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if (name) {
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if (index >= 0) {
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pr_err("ERROR: could not get IIO channel %pfw:%s(%i)\n",
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fwnode, name, index);
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/*
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* In this case, we found 'name' in 'io-channel-names'
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* but somehow we still fail so that we should not proceed
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* with any other lookup. Hence, explicitly return -EINVAL
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* (maybe not the better error code) so that the caller
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* won't do a system lookup.
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*/
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return ERR_PTR(-EINVAL);
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}
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/*
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* If index < 0, then fwnode_property_get_reference_args() fails
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* with -EINVAL or -ENOENT (ACPI case) which is expected. We
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* should not proceed if we get any other error.
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*/
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if (PTR_ERR(chan) != -EINVAL && PTR_ERR(chan) != -ENOENT)
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return chan;
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} else if (PTR_ERR(chan) != -ENOENT) {
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/*
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* if !name, then we should only proceed the lookup if
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* fwnode_property_get_reference_args() returns -ENOENT.
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*/
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return chan;
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}
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/* so we continue the lookup */
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return ERR_PTR(-ENODEV);
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}
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struct iio_channel *fwnode_iio_channel_get_by_name(struct fwnode_handle *fwnode,
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const char *name)
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{
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struct fwnode_handle *parent;
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struct iio_channel *chan;
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/* Walk up the tree of devices looking for a matching iio channel */
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chan = __fwnode_iio_channel_get_by_name(fwnode, name);
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if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV)
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return chan;
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/*
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* No matching IIO channel found on this node.
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* If the parent node has a "io-channel-ranges" property,
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* then we can try one of its channels.
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*/
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fwnode_for_each_parent_node(fwnode, parent) {
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if (!fwnode_property_present(parent, "io-channel-ranges")) {
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fwnode_handle_put(parent);
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return ERR_PTR(-ENODEV);
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}
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chan = __fwnode_iio_channel_get_by_name(fwnode, name);
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if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV) {
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fwnode_handle_put(parent);
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return chan;
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}
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}
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return ERR_PTR(-ENODEV);
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}
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EXPORT_SYMBOL_GPL(fwnode_iio_channel_get_by_name);
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static struct iio_channel *fwnode_iio_channel_get_all(struct device *dev)
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{
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struct fwnode_handle *fwnode = dev_fwnode(dev);
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struct iio_channel *chans;
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int i, mapind, nummaps = 0;
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int ret;
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do {
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ret = fwnode_property_get_reference_args(fwnode, "io-channels",
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"#io-channel-cells", 0,
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nummaps, NULL);
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if (ret < 0)
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break;
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} while (++nummaps);
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if (nummaps == 0)
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return ERR_PTR(-ENODEV);
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/* NULL terminated array to save passing size */
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chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL);
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if (!chans)
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return ERR_PTR(-ENOMEM);
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/* Search for FW matches */
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for (mapind = 0; mapind < nummaps; mapind++) {
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ret = __fwnode_iio_channel_get(&chans[mapind], fwnode, mapind);
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if (ret)
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goto error_free_chans;
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}
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return chans;
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error_free_chans:
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for (i = 0; i < mapind; i++)
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iio_device_put(chans[i].indio_dev);
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kfree(chans);
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return ERR_PTR(ret);
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}
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static struct iio_channel *iio_channel_get_sys(const char *name,
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const char *channel_name)
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{
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struct iio_map_internal *c_i = NULL, *c = NULL;
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struct iio_channel *channel;
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int err;
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if (!(name || channel_name))
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return ERR_PTR(-ENODEV);
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/* first find matching entry the channel map */
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mutex_lock(&iio_map_list_lock);
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list_for_each_entry(c_i, &iio_map_list, l) {
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if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) ||
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(channel_name &&
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strcmp(channel_name, c_i->map->consumer_channel) != 0))
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continue;
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c = c_i;
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iio_device_get(c->indio_dev);
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break;
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}
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mutex_unlock(&iio_map_list_lock);
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if (!c)
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return ERR_PTR(-ENODEV);
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channel = kzalloc(sizeof(*channel), GFP_KERNEL);
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if (!channel) {
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err = -ENOMEM;
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goto error_no_mem;
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}
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channel->indio_dev = c->indio_dev;
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if (c->map->adc_channel_label) {
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channel->channel =
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iio_chan_spec_from_name(channel->indio_dev,
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c->map->adc_channel_label);
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if (!channel->channel) {
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err = -EINVAL;
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goto error_no_chan;
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}
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}
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return channel;
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error_no_chan:
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kfree(channel);
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error_no_mem:
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iio_device_put(c->indio_dev);
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return ERR_PTR(err);
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}
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struct iio_channel *iio_channel_get(struct device *dev,
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const char *channel_name)
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{
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const char *name = dev ? dev_name(dev) : NULL;
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struct iio_channel *channel;
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if (dev) {
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channel = fwnode_iio_channel_get_by_name(dev_fwnode(dev),
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channel_name);
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if (!IS_ERR(channel) || PTR_ERR(channel) != -ENODEV)
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return channel;
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}
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return iio_channel_get_sys(name, channel_name);
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}
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EXPORT_SYMBOL_GPL(iio_channel_get);
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void iio_channel_release(struct iio_channel *channel)
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{
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if (!channel)
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return;
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iio_device_put(channel->indio_dev);
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kfree(channel);
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}
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EXPORT_SYMBOL_GPL(iio_channel_release);
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static void devm_iio_channel_free(void *iio_channel)
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{
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iio_channel_release(iio_channel);
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}
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struct iio_channel *devm_iio_channel_get(struct device *dev,
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const char *channel_name)
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{
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struct iio_channel *channel;
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int ret;
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channel = iio_channel_get(dev, channel_name);
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if (IS_ERR(channel))
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return channel;
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ret = devm_add_action_or_reset(dev, devm_iio_channel_free, channel);
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if (ret)
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return ERR_PTR(ret);
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return channel;
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}
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EXPORT_SYMBOL_GPL(devm_iio_channel_get);
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struct iio_channel *devm_fwnode_iio_channel_get_by_name(struct device *dev,
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struct fwnode_handle *fwnode,
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const char *channel_name)
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{
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struct iio_channel *channel;
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int ret;
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channel = fwnode_iio_channel_get_by_name(fwnode, channel_name);
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if (IS_ERR(channel))
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return channel;
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|
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ret = devm_add_action_or_reset(dev, devm_iio_channel_free, channel);
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if (ret)
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return ERR_PTR(ret);
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return channel;
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}
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EXPORT_SYMBOL_GPL(devm_fwnode_iio_channel_get_by_name);
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|
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struct iio_channel *iio_channel_get_all(struct device *dev)
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{
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const char *name;
|
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struct iio_channel *chans;
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struct iio_map_internal *c = NULL;
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int nummaps = 0;
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int mapind = 0;
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int i, ret;
|
|
|
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if (!dev)
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return ERR_PTR(-EINVAL);
|
|
|
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chans = fwnode_iio_channel_get_all(dev);
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/*
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|
* We only want to carry on if the error is -ENODEV. Anything else
|
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* should be reported up the stack.
|
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*/
|
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if (!IS_ERR(chans) || PTR_ERR(chans) != -ENODEV)
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return chans;
|
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|
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name = dev_name(dev);
|
|
|
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mutex_lock(&iio_map_list_lock);
|
|
/* first count the matching maps */
|
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list_for_each_entry(c, &iio_map_list, l)
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if (name && strcmp(name, c->map->consumer_dev_name) != 0)
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continue;
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else
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nummaps++;
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|
|
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if (nummaps == 0) {
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ret = -ENODEV;
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goto error_ret;
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}
|
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|
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/* NULL terminated array to save passing size */
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chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL);
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if (!chans) {
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ret = -ENOMEM;
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goto error_ret;
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}
|
|
|
|
/* for each map fill in the chans element */
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|
list_for_each_entry(c, &iio_map_list, l) {
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if (name && strcmp(name, c->map->consumer_dev_name) != 0)
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continue;
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chans[mapind].indio_dev = c->indio_dev;
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chans[mapind].data = c->map->consumer_data;
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chans[mapind].channel =
|
|
iio_chan_spec_from_name(chans[mapind].indio_dev,
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c->map->adc_channel_label);
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if (!chans[mapind].channel) {
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ret = -EINVAL;
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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(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)
|
|
{
|
|
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 (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)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
|
|
err_unlock:
|
|
mutex_unlock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
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);
|
|
int ret;
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW);
|
|
err_unlock:
|
|
mutex_unlock(&iio_dev_opaque->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;
|
|
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;
|
|
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)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_convert_raw_to_processed_unlocked(chan, raw, processed,
|
|
scale);
|
|
err_unlock:
|
|
mutex_unlock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
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);
|
|
int ret;
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read(chan, val, val2, attribute);
|
|
err_unlock:
|
|
mutex_unlock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
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;
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
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);
|
|
if (ret < 0)
|
|
goto err_unlock;
|
|
*val *= scale;
|
|
} 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,
|
|
scale);
|
|
}
|
|
|
|
err_unlock:
|
|
mutex_unlock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
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)
|
|
{
|
|
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_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);
|
|
int ret;
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_read_avail(chan, vals, type, length, attribute);
|
|
err_unlock:
|
|
mutex_unlock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
|
|
int ret;
|
|
int type;
|
|
|
|
mutex_lock(&iio_dev_opaque->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(&iio_dev_opaque->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)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
|
|
int ret = 0;
|
|
/* Need to verify underlying driver has not gone away */
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
*type = chan->channel->type;
|
|
err_unlock:
|
|
mutex_unlock(&iio_dev_opaque->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_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);
|
|
int ret;
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
if (!chan->indio_dev->info) {
|
|
ret = -ENODEV;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = iio_channel_write(chan, val, val2, attribute);
|
|
err_unlock:
|
|
mutex_unlock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
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);
|