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3183bac16f
When the IIO consumer tries to get specific IIO channel, few error cases can be happened. (a) Memory allocation failure (b) No matched ADC channel error (c) Invalid input arguments This patch enables cleaning up error handling in case of (a) and (b). In error handling code, (a): the reference count of the IIO device should be decreased. (b): the allocated memory should be freed with restoring the reference count. Therefore iio_deivce_put() is called in both cases. This can be handled in the last error statement. Additionally, integer variable is used for stating each error case explicitly. Then, the error returns as ERR_PTR() with this value. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
407 lines
9.0 KiB
C
407 lines
9.0 KiB
C
/* 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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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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/slab.h>
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#include <linux/mutex.h>
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#include <linux/iio/iio.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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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 == NULL)
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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 != NULL) {
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mapi = kzalloc(sizeof(*mapi), GFP_KERNEL);
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if (mapi == NULL) {
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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(&mapi->l, &iio_map_list);
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i++;
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}
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error_ret:
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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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/* Assumes the exact same array (e.g. memory locations)
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* used at unregistration as used at registration rather than
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* more complex checking of contents.
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*/
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int iio_map_array_unregister(struct iio_dev *indio_dev,
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struct iio_map *maps)
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{
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int i = 0, ret = 0;
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bool found_it;
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struct iio_map_internal *mapi;
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if (maps == NULL)
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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 != NULL) {
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found_it = false;
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list_for_each_entry(mapi, &iio_map_list, l)
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if (&maps[i] == mapi->map) {
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list_del(&mapi->l);
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kfree(mapi);
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found_it = true;
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break;
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}
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if (found_it == false) {
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ret = -ENODEV;
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goto error_ret;
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}
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i++;
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}
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error_ret:
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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 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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struct iio_channel *iio_channel_get(const char *name, 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 == NULL && channel_name == NULL)
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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 == NULL)
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return ERR_PTR(-ENODEV);
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channel = kzalloc(sizeof(*channel), GFP_KERNEL);
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if (channel == NULL) {
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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 == NULL) {
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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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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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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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struct iio_channel *iio_channel_get_all(const char *name)
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{
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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 (name == NULL)
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return ERR_PTR(-EINVAL);
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mutex_lock(&iio_map_list_lock);
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/* 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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if (nummaps == 0) {
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ret = -ENODEV;
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goto error_ret;
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}
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/* NULL terminated array to save passing size */
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chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL);
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if (chans == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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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].channel =
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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 == NULL) {
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ret = -EINVAL;
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goto error_free_chans;
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}
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iio_device_get(chans[mapind].indio_dev);
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mapind++;
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}
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if (mapind == 0) {
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ret = -ENODEV;
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goto error_free_chans;
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}
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mutex_unlock(&iio_map_list_lock);
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return chans;
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error_free_chans:
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for (i = 0; i < nummaps; i++)
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iio_device_put(chans[i].indio_dev);
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kfree(chans);
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error_ret:
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mutex_unlock(&iio_map_list_lock);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(iio_channel_get_all);
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void iio_channel_release_all(struct iio_channel *channels)
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{
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struct iio_channel *chan = &channels[0];
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while (chan->indio_dev) {
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iio_device_put(chan->indio_dev);
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chan++;
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}
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kfree(channels);
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}
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EXPORT_SYMBOL_GPL(iio_channel_release_all);
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static int iio_channel_read(struct iio_channel *chan, int *val, int *val2,
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enum iio_chan_info_enum info)
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{
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int unused;
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if (val2 == NULL)
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val2 = &unused;
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return chan->indio_dev->info->read_raw(chan->indio_dev, chan->channel,
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val, val2, info);
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}
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int iio_read_channel_raw(struct iio_channel *chan, int *val)
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{
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int ret;
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mutex_lock(&chan->indio_dev->info_exist_lock);
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if (chan->indio_dev->info == NULL) {
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ret = -ENODEV;
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goto err_unlock;
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}
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ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
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err_unlock:
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mutex_unlock(&chan->indio_dev->info_exist_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iio_read_channel_raw);
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static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,
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int raw, int *processed, unsigned int scale)
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{
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int scale_type, scale_val, scale_val2, offset;
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s64 raw64 = raw;
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int ret;
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ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_SCALE);
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if (ret == 0)
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raw64 += offset;
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scale_type = iio_channel_read(chan, &scale_val, &scale_val2,
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IIO_CHAN_INFO_SCALE);
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if (scale_type < 0)
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return scale_type;
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switch (scale_type) {
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case IIO_VAL_INT:
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*processed = raw64 * scale_val;
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break;
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case IIO_VAL_INT_PLUS_MICRO:
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if (scale_val2 < 0)
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*processed = -raw64 * scale_val;
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else
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*processed = raw64 * scale_val;
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*processed += div_s64(raw64 * (s64)scale_val2 * scale,
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1000000LL);
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break;
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case IIO_VAL_INT_PLUS_NANO:
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if (scale_val2 < 0)
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*processed = -raw64 * scale_val;
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else
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*processed = raw64 * scale_val;
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*processed += div_s64(raw64 * (s64)scale_val2 * scale,
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1000000000LL);
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break;
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case IIO_VAL_FRACTIONAL:
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*processed = div_s64(raw64 * (s64)scale_val * scale,
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scale_val2);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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int iio_convert_raw_to_processed(struct iio_channel *chan, int raw,
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int *processed, unsigned int scale)
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{
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int ret;
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mutex_lock(&chan->indio_dev->info_exist_lock);
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if (chan->indio_dev->info == NULL) {
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ret = -ENODEV;
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goto err_unlock;
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}
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ret = iio_convert_raw_to_processed_unlocked(chan, raw, processed,
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scale);
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err_unlock:
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mutex_unlock(&chan->indio_dev->info_exist_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed);
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int iio_read_channel_processed(struct iio_channel *chan, int *val)
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{
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int ret;
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mutex_lock(&chan->indio_dev->info_exist_lock);
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if (chan->indio_dev->info == NULL) {
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ret = -ENODEV;
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goto err_unlock;
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}
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if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) {
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ret = iio_channel_read(chan, val, NULL,
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IIO_CHAN_INFO_PROCESSED);
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} else {
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ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
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if (ret < 0)
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goto err_unlock;
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ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1);
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}
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err_unlock:
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mutex_unlock(&chan->indio_dev->info_exist_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iio_read_channel_processed);
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int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2)
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{
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int ret;
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mutex_lock(&chan->indio_dev->info_exist_lock);
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if (chan->indio_dev->info == NULL) {
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ret = -ENODEV;
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goto err_unlock;
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}
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ret = iio_channel_read(chan, val, val2, IIO_CHAN_INFO_SCALE);
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err_unlock:
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mutex_unlock(&chan->indio_dev->info_exist_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iio_read_channel_scale);
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int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type)
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{
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int ret = 0;
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/* Need to verify underlying driver has not gone away */
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mutex_lock(&chan->indio_dev->info_exist_lock);
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if (chan->indio_dev->info == NULL) {
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ret = -ENODEV;
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goto err_unlock;
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}
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*type = chan->channel->type;
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err_unlock:
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mutex_unlock(&chan->indio_dev->info_exist_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iio_get_channel_type);
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