[deliverable/linux.git] / drivers / iio / buffer_cb.c

#include <linux/kernel.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;
};

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,
};

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_dev *indio_dev;
	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;
	}

	indio_dev = cb_buff->channels[0].indio_dev;
	cb_buff->buffer.scan_mask
		= kcalloc(BITS_TO_LONGS(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 != 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->channels[0].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->channels[0].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);
Commit	Line	Data
92d1079b JC	1	#include <linux/kernel.h>
	2	#include <linux/slab.h>
	3	#include <linux/err.h>
	4	#include <linux/export.h>
	5	#include <linux/iio/buffer.h>
	6	#include <linux/iio/consumer.h>
	7
	8	struct iio_cb_buffer {
	9	struct iio_buffer buffer;
5d65d920	10	int (cb)(const void data, void *private);
92d1079b JC	11	void *private;
	12	struct iio_channel *channels;
	13	};
	14
9e69c935	15	static struct iio_cb_buffer buffer_to_cb_buffer(struct iio_buffer buffer)
92d1079b	16	{
9e69c935 LPC	17	return container_of(buffer, struct iio_cb_buffer, buffer);
9e69c935 LPC	18	}
92d1079b	19
9e69c935 LPC	20	static int iio_buffer_cb_store_to(struct iio_buffer buffer, const void data)
	21	{
	22	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
92d1079b JC	23	return cb_buff->cb(data, cb_buff->private);
	24	}
	25
9e69c935 LPC	26	static void iio_buffer_cb_release(struct iio_buffer *buffer)
	27	{
	28	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
	29	kfree(cb_buff->buffer.scan_mask);
	30	kfree(cb_buff);
	31	}
	32
c7a22c36	33	static const struct iio_buffer_access_funcs iio_cb_access = {
92d1079b	34	.store_to = &iio_buffer_cb_store_to,
9e69c935	35	.release = &iio_buffer_cb_release,
92d1079b JC	36	};
92d1079b JC	37
ca7d98db	38	struct iio_cb_buffer iio_channel_get_all_cb(struct device dev,
5d65d920	39	int (cb)(const void data,
92d1079b JC	40	void *private),
	41	void *private)
	42	{
	43	int ret;
	44	struct iio_cb_buffer *cb_buff;
	45	struct iio_dev *indio_dev;
	46	struct iio_channel *chan;
	47
	48	cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
92825ff9 HK	49	if (cb_buff == NULL)
92825ff9 HK	50	return ERR_PTR(-ENOMEM);
92d1079b	51
bda2f8fc LPC	52	iio_buffer_init(&cb_buff->buffer);
bda2f8fc LPC	53
92d1079b JC	54	cb_buff->private = private;
	55	cb_buff->cb = cb;
	56	cb_buff->buffer.access = &iio_cb_access;
	57	INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
	58
ca7d98db	59	cb_buff->channels = iio_channel_get_all(dev);
92d1079b JC	60	if (IS_ERR(cb_buff->channels)) {
	61	ret = PTR_ERR(cb_buff->channels);
	62	goto error_free_cb_buff;
	63	}
	64
	65	indio_dev = cb_buff->channels[0].indio_dev;
	66	cb_buff->buffer.scan_mask
	67	= kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
	68	GFP_KERNEL);
	69	if (cb_buff->buffer.scan_mask == NULL) {
	70	ret = -ENOMEM;
	71	goto error_release_channels;
	72	}
	73	chan = &cb_buff->channels[0];
	74	while (chan->indio_dev) {
	75	if (chan->indio_dev != indio_dev) {
	76	ret = -EINVAL;
702df9f1	77	goto error_free_scan_mask;
92d1079b JC	78	}
	79	set_bit(chan->channel->scan_index,
	80	cb_buff->buffer.scan_mask);
	81	chan++;
	82	}
	83
	84	return cb_buff;
	85
702df9f1 JC	86	error_free_scan_mask:
702df9f1 JC	87	kfree(cb_buff->buffer.scan_mask);
92d1079b JC	88	error_release_channels:
	89	iio_channel_release_all(cb_buff->channels);
	90	error_free_cb_buff:
	91	kfree(cb_buff);
92d1079b JC	92	return ERR_PTR(ret);
	93	}
	94	EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
	95
	96	int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
	97	{
	98	return iio_update_buffers(cb_buff->channels[0].indio_dev,
	99	&cb_buff->buffer,
	100	NULL);
	101	}
	102	EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
	103
	104	void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
	105	{
	106	iio_update_buffers(cb_buff->channels[0].indio_dev,
	107	NULL,
	108	&cb_buff->buffer);
	109	}
	110	EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
	111
	112	void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
	113	{
	114	iio_channel_release_all(cb_buff->channels);
9e69c935	115	iio_buffer_put(&cb_buff->buffer);
92d1079b JC	116	}
	117	EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
	118
	119	struct iio_channel
	120	iio_channel_cb_get_channels(const struct iio_cb_buffer cb_buffer)
	121	{
	122	return cb_buffer->channels;
	123	}
	124	EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);