[deliverable/linux.git] / drivers / iio / buffer / industrialio-buffer-cb.c

/* The industrial I/O callback buffer
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/iio/buffer.h>
#include <linux/iio/consumer.h>

struct iio_cb_buffer {
	struct iio_buffer buffer;
	int (*cb)(const void *data, void *private);
	void *private;
	struct iio_channel *channels;
	struct iio_dev *indio_dev;
};

static struct iio_cb_buffer *buffer_to_cb_buffer(struct iio_buffer *buffer)
{
	return container_of(buffer, struct iio_cb_buffer, buffer);
}

static int iio_buffer_cb_store_to(struct iio_buffer *buffer, const void *data)
{
	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
	return cb_buff->cb(data, cb_buff->private);
}

static void iio_buffer_cb_release(struct iio_buffer *buffer)
{
	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
	kfree(cb_buff->buffer.scan_mask);
	kfree(cb_buff);
}

static const struct iio_buffer_access_funcs iio_cb_access = {
	.store_to = &iio_buffer_cb_store_to,
	.release = &iio_buffer_cb_release,

	.modes = INDIO_BUFFER_SOFTWARE | INDIO_BUFFER_TRIGGERED,
};

struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
					     int (*cb)(const void *data,
						       void *private),
					     void *private)
{
	int ret;
	struct iio_cb_buffer *cb_buff;
	struct iio_channel *chan;

	cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
	if (cb_buff == NULL)
		return ERR_PTR(-ENOMEM);

	iio_buffer_init(&cb_buff->buffer);

	cb_buff->private = private;
	cb_buff->cb = cb;
	cb_buff->buffer.access = &iio_cb_access;
	INIT_LIST_HEAD(&cb_buff->buffer.demux_list);

	cb_buff->channels = iio_channel_get_all(dev);
	if (IS_ERR(cb_buff->channels)) {
		ret = PTR_ERR(cb_buff->channels);
		goto error_free_cb_buff;
	}

	cb_buff->indio_dev = cb_buff->channels[0].indio_dev;
	cb_buff->buffer.scan_mask
		= kcalloc(BITS_TO_LONGS(cb_buff->indio_dev->masklength),
			  sizeof(long), GFP_KERNEL);
	if (cb_buff->buffer.scan_mask == NULL) {
		ret = -ENOMEM;
		goto error_release_channels;
	}
	chan = &cb_buff->channels[0];
	while (chan->indio_dev) {
		if (chan->indio_dev != cb_buff->indio_dev) {
			ret = -EINVAL;
			goto error_free_scan_mask;
		}
		set_bit(chan->channel->scan_index,
			cb_buff->buffer.scan_mask);
		chan++;
	}

	return cb_buff;

error_free_scan_mask:
	kfree(cb_buff->buffer.scan_mask);
error_release_channels:
	iio_channel_release_all(cb_buff->channels);
error_free_cb_buff:
	kfree(cb_buff);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);

int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
{
	return iio_update_buffers(cb_buff->indio_dev, &cb_buff->buffer,
				  NULL);
}
EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);

void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
{
	iio_update_buffers(cb_buff->indio_dev, NULL, &cb_buff->buffer);
}
EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);

void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
{
	iio_channel_release_all(cb_buff->channels);
	iio_buffer_put(&cb_buff->buffer);
}
EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);

struct iio_channel
*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer)
{
	return cb_buffer->channels;
}
EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);

struct iio_dev
*iio_channel_cb_get_iio_dev(const struct iio_cb_buffer *cb_buffer)
{
	return cb_buffer->indio_dev;
}
EXPORT_SYMBOL_GPL(iio_channel_cb_get_iio_dev);

MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
MODULE_DESCRIPTION("Industrial I/O callback buffer");
MODULE_LICENSE("GPL");
Commit	Line	Data
050ee2f1 LPC	1	/* The industrial I/O callback buffer
	2	*
	3	* This program is free software; you can redistribute it and/or modify it
	4	* under the terms of the GNU General Public License version 2 as published by
	5	* the Free Software Foundation.
	6	*/
	7
92d1079b	8	#include <linux/kernel.h>
050ee2f1	9	#include <linux/module.h>
92d1079b JC	10	#include <linux/slab.h>
	11	#include <linux/err.h>
	12	#include <linux/export.h>
	13	#include <linux/iio/buffer.h>
	14	#include <linux/iio/consumer.h>
	15
	16	struct iio_cb_buffer {
	17	struct iio_buffer buffer;
5d65d920	18	int (cb)(const void data, void *private);
92d1079b JC	19	void *private;
92d1079b JC	20	struct iio_channel *channels;
adca058b	21	struct iio_dev *indio_dev;
92d1079b JC	22	};
92d1079b JC	23
9e69c935	24	static struct iio_cb_buffer buffer_to_cb_buffer(struct iio_buffer buffer)
92d1079b	25	{
9e69c935 LPC	26	return container_of(buffer, struct iio_cb_buffer, buffer);
9e69c935 LPC	27	}
92d1079b	28
9e69c935 LPC	29	static int iio_buffer_cb_store_to(struct iio_buffer buffer, const void data)
	30	{
	31	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
92d1079b JC	32	return cb_buff->cb(data, cb_buff->private);
	33	}
	34
9e69c935 LPC	35	static void iio_buffer_cb_release(struct iio_buffer *buffer)
	36	{
	37	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
	38	kfree(cb_buff->buffer.scan_mask);
	39	kfree(cb_buff);
	40	}
	41
c7a22c36	42	static const struct iio_buffer_access_funcs iio_cb_access = {
92d1079b	43	.store_to = &iio_buffer_cb_store_to,
9e69c935	44	.release = &iio_buffer_cb_release,
225d59ad LPC	45
225d59ad LPC	46	.modes = INDIO_BUFFER_SOFTWARE \| INDIO_BUFFER_TRIGGERED,
92d1079b JC	47	};
92d1079b JC	48
ca7d98db	49	struct iio_cb_buffer iio_channel_get_all_cb(struct device dev,
5d65d920	50	int (cb)(const void data,
92d1079b JC	51	void *private),
	52	void *private)
	53	{
	54	int ret;
	55	struct iio_cb_buffer *cb_buff;
92d1079b JC	56	struct iio_channel *chan;
	57
	58	cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
92825ff9 HK	59	if (cb_buff == NULL)
92825ff9 HK	60	return ERR_PTR(-ENOMEM);
92d1079b	61
bda2f8fc LPC	62	iio_buffer_init(&cb_buff->buffer);
bda2f8fc LPC	63
92d1079b JC	64	cb_buff->private = private;
	65	cb_buff->cb = cb;
	66	cb_buff->buffer.access = &iio_cb_access;
	67	INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
	68
ca7d98db	69	cb_buff->channels = iio_channel_get_all(dev);
92d1079b JC	70	if (IS_ERR(cb_buff->channels)) {
	71	ret = PTR_ERR(cb_buff->channels);
	72	goto error_free_cb_buff;
	73	}
	74
adca058b	75	cb_buff->indio_dev = cb_buff->channels[0].indio_dev;
92d1079b	76	cb_buff->buffer.scan_mask
adca058b MR	77	= kcalloc(BITS_TO_LONGS(cb_buff->indio_dev->masklength),
adca058b MR	78	sizeof(long), GFP_KERNEL);
92d1079b JC	79	if (cb_buff->buffer.scan_mask == NULL) {
	80	ret = -ENOMEM;
	81	goto error_release_channels;
	82	}
	83	chan = &cb_buff->channels[0];
	84	while (chan->indio_dev) {
adca058b	85	if (chan->indio_dev != cb_buff->indio_dev) {
92d1079b	86	ret = -EINVAL;
702df9f1	87	goto error_free_scan_mask;
92d1079b JC	88	}
	89	set_bit(chan->channel->scan_index,
	90	cb_buff->buffer.scan_mask);
	91	chan++;
	92	}
	93
	94	return cb_buff;
	95
702df9f1 JC	96	error_free_scan_mask:
702df9f1 JC	97	kfree(cb_buff->buffer.scan_mask);
92d1079b JC	98	error_release_channels:
	99	iio_channel_release_all(cb_buff->channels);
	100	error_free_cb_buff:
	101	kfree(cb_buff);
92d1079b JC	102	return ERR_PTR(ret);
	103	}
	104	EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
	105
	106	int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
	107	{
adca058b	108	return iio_update_buffers(cb_buff->indio_dev, &cb_buff->buffer,
92d1079b JC	109	NULL);
	110	}
	111	EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
	112
	113	void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
	114	{
adca058b	115	iio_update_buffers(cb_buff->indio_dev, NULL, &cb_buff->buffer);
92d1079b JC	116	}
	117	EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
	118
	119	void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
	120	{
	121	iio_channel_release_all(cb_buff->channels);
9e69c935	122	iio_buffer_put(&cb_buff->buffer);
92d1079b JC	123	}
	124	EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
	125
	126	struct iio_channel
	127	iio_channel_cb_get_channels(const struct iio_cb_buffer cb_buffer)
	128	{
	129	return cb_buffer->channels;
	130	}
	131	EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);
050ee2f1	132
adca058b MR	133	struct iio_dev
	134	iio_channel_cb_get_iio_dev(const struct iio_cb_buffer cb_buffer)
	135	{
	136	return cb_buffer->indio_dev;
	137	}
	138	EXPORT_SYMBOL_GPL(iio_channel_cb_get_iio_dev);
	139
050ee2f1 LPC	140	MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
	141	MODULE_DESCRIPTION("Industrial I/O callback buffer");
	142	MODULE_LICENSE("GPL");