2018-01-10 18:13:03 +08:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2017 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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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/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/consumer.h>
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#include <linux/iio/hw-consumer.h>
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#include <linux/iio/buffer_impl.h>
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/**
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* struct iio_hw_consumer - IIO hw consumer block
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* @buffers: hardware buffers list head.
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* @channels: IIO provider channels.
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*/
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struct iio_hw_consumer {
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struct list_head buffers;
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struct iio_channel *channels;
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};
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struct hw_consumer_buffer {
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struct list_head head;
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struct iio_dev *indio_dev;
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struct iio_buffer buffer;
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long scan_mask[];
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};
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static struct hw_consumer_buffer *iio_buffer_to_hw_consumer_buffer(
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struct iio_buffer *buffer)
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{
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return container_of(buffer, struct hw_consumer_buffer, buffer);
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}
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static void iio_hw_buf_release(struct iio_buffer *buffer)
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{
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struct hw_consumer_buffer *hw_buf =
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iio_buffer_to_hw_consumer_buffer(buffer);
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kfree(hw_buf);
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}
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static const struct iio_buffer_access_funcs iio_hw_buf_access = {
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.release = &iio_hw_buf_release,
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.modes = INDIO_BUFFER_HARDWARE,
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};
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static struct hw_consumer_buffer *iio_hw_consumer_get_buffer(
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struct iio_hw_consumer *hwc, struct iio_dev *indio_dev)
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{
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size_t mask_size = BITS_TO_LONGS(indio_dev->masklength) * sizeof(long);
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struct hw_consumer_buffer *buf;
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list_for_each_entry(buf, &hwc->buffers, head) {
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if (buf->indio_dev == indio_dev)
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return buf;
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}
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buf = kzalloc(sizeof(*buf) + mask_size, GFP_KERNEL);
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if (!buf)
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return NULL;
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buf->buffer.access = &iio_hw_buf_access;
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buf->indio_dev = indio_dev;
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buf->buffer.scan_mask = buf->scan_mask;
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iio_buffer_init(&buf->buffer);
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list_add_tail(&buf->head, &hwc->buffers);
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return buf;
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}
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/**
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* iio_hw_consumer_alloc() - Allocate IIO hardware consumer
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* @dev: Pointer to consumer device.
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*
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* Returns a valid iio_hw_consumer on success or a ERR_PTR() on failure.
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*/
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struct iio_hw_consumer *iio_hw_consumer_alloc(struct device *dev)
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{
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struct hw_consumer_buffer *buf;
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struct iio_hw_consumer *hwc;
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struct iio_channel *chan;
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int ret;
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hwc = kzalloc(sizeof(*hwc), GFP_KERNEL);
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if (!hwc)
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return ERR_PTR(-ENOMEM);
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INIT_LIST_HEAD(&hwc->buffers);
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hwc->channels = iio_channel_get_all(dev);
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if (IS_ERR(hwc->channels)) {
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ret = PTR_ERR(hwc->channels);
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goto err_free_hwc;
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}
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chan = &hwc->channels[0];
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while (chan->indio_dev) {
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buf = iio_hw_consumer_get_buffer(hwc, chan->indio_dev);
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if (!buf) {
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ret = -ENOMEM;
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goto err_put_buffers;
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}
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set_bit(chan->channel->scan_index, buf->buffer.scan_mask);
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chan++;
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}
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return hwc;
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err_put_buffers:
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list_for_each_entry(buf, &hwc->buffers, head)
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iio_buffer_put(&buf->buffer);
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iio_channel_release_all(hwc->channels);
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err_free_hwc:
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kfree(hwc);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(iio_hw_consumer_alloc);
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/**
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* iio_hw_consumer_free() - Free IIO hardware consumer
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* @hwc: hw consumer to free.
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*/
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void iio_hw_consumer_free(struct iio_hw_consumer *hwc)
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{
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struct hw_consumer_buffer *buf, *n;
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iio_channel_release_all(hwc->channels);
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list_for_each_entry_safe(buf, n, &hwc->buffers, head)
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iio_buffer_put(&buf->buffer);
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kfree(hwc);
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}
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EXPORT_SYMBOL_GPL(iio_hw_consumer_free);
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2018-01-10 18:13:05 +08:00
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static void devm_iio_hw_consumer_release(struct device *dev, void *res)
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{
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iio_hw_consumer_free(*(struct iio_hw_consumer **)res);
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}
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/**
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* devm_iio_hw_consumer_alloc - Resource-managed iio_hw_consumer_alloc()
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* @dev: Pointer to consumer device.
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*
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* Managed iio_hw_consumer_alloc. iio_hw_consumer allocated with this function
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* is automatically freed on driver detach.
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*
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* returns pointer to allocated iio_hw_consumer on success, NULL on failure.
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*/
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struct iio_hw_consumer *devm_iio_hw_consumer_alloc(struct device *dev)
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{
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struct iio_hw_consumer **ptr, *iio_hwc;
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ptr = devres_alloc(devm_iio_hw_consumer_release, sizeof(*ptr),
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GFP_KERNEL);
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if (!ptr)
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return NULL;
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iio_hwc = iio_hw_consumer_alloc(dev);
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if (IS_ERR(iio_hwc)) {
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devres_free(ptr);
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} else {
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*ptr = iio_hwc;
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devres_add(dev, ptr);
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}
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return iio_hwc;
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}
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EXPORT_SYMBOL_GPL(devm_iio_hw_consumer_alloc);
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2018-01-10 18:13:03 +08:00
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/**
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* iio_hw_consumer_enable() - Enable IIO hardware consumer
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* @hwc: iio_hw_consumer to enable.
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*
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* Returns 0 on success.
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*/
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int iio_hw_consumer_enable(struct iio_hw_consumer *hwc)
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{
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struct hw_consumer_buffer *buf;
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int ret;
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list_for_each_entry(buf, &hwc->buffers, head) {
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ret = iio_update_buffers(buf->indio_dev, &buf->buffer, NULL);
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if (ret)
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goto err_disable_buffers;
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}
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return 0;
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err_disable_buffers:
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list_for_each_entry_continue_reverse(buf, &hwc->buffers, head)
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iio_update_buffers(buf->indio_dev, NULL, &buf->buffer);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iio_hw_consumer_enable);
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/**
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* iio_hw_consumer_disable() - Disable IIO hardware consumer
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* @hwc: iio_hw_consumer to disable.
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*/
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void iio_hw_consumer_disable(struct iio_hw_consumer *hwc)
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{
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struct hw_consumer_buffer *buf;
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list_for_each_entry(buf, &hwc->buffers, head)
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iio_update_buffers(buf->indio_dev, NULL, &buf->buffer);
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}
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EXPORT_SYMBOL_GPL(iio_hw_consumer_disable);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("Hardware consumer buffer the IIO framework");
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MODULE_LICENSE("GPL v2");
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