[GitHub/mt8127/android_kernel_alcatel_ttab.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)(u8 *data, void *private);
	void *private;
	struct iio_channel *channels;
};

static int iio_buffer_cb_store_to(struct iio_buffer *buffer, u8 *data)
{
	struct iio_cb_buffer *cb_buff = container_of(buffer,
						     struct iio_cb_buffer,
						     buffer);

	return cb_buff->cb(data, cb_buff->private);
}

static struct iio_buffer_access_funcs iio_cb_access = {
	.store_to = &iio_buffer_cb_store_to,
};

struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
					     int (*cb)(u8 *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) {
		ret = -ENOMEM;
		goto error_ret;
	}

	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);
error_ret:
	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)
{
	kfree(cb_buff->buffer.scan_mask);
	iio_channel_release_all(cb_buff->channels);
	kfree(cb_buff);
}
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;
	10	int (cb)(u8 data, void *private);
	11	void *private;
	12	struct iio_channel *channels;
	13	};
	14
	15	static int iio_buffer_cb_store_to(struct iio_buffer buffer, u8 data)
	16	{
	17	struct iio_cb_buffer *cb_buff = container_of(buffer,
	18	struct iio_cb_buffer,
	19	buffer);
	20
	21	return cb_buff->cb(data, cb_buff->private);
	22	}
	23
	24	static struct iio_buffer_access_funcs iio_cb_access = {
	25	.store_to = &iio_buffer_cb_store_to,
	26	};
	27
ca7d98db	28	struct iio_cb_buffer iio_channel_get_all_cb(struct device dev,
92d1079b JC	29	int (cb)(u8 data,
	30	void *private),
	31	void *private)
	32	{
	33	int ret;
	34	struct iio_cb_buffer *cb_buff;
	35	struct iio_dev *indio_dev;
	36	struct iio_channel *chan;
	37
	38	cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
	39	if (cb_buff == NULL) {
	40	ret = -ENOMEM;
	41	goto error_ret;
	42	}
	43
	44	cb_buff->private = private;
	45	cb_buff->cb = cb;
	46	cb_buff->buffer.access = &iio_cb_access;
	47	INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
	48
ca7d98db	49	cb_buff->channels = iio_channel_get_all(dev);
92d1079b JC	50	if (IS_ERR(cb_buff->channels)) {
	51	ret = PTR_ERR(cb_buff->channels);
	52	goto error_free_cb_buff;
	53	}
	54
	55	indio_dev = cb_buff->channels[0].indio_dev;
	56	cb_buff->buffer.scan_mask
	57	= kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
	58	GFP_KERNEL);
	59	if (cb_buff->buffer.scan_mask == NULL) {
	60	ret = -ENOMEM;
	61	goto error_release_channels;
	62	}
	63	chan = &cb_buff->channels[0];
	64	while (chan->indio_dev) {
	65	if (chan->indio_dev != indio_dev) {
	66	ret = -EINVAL;
702df9f1	67	goto error_free_scan_mask;
92d1079b JC	68	}
	69	set_bit(chan->channel->scan_index,
	70	cb_buff->buffer.scan_mask);
	71	chan++;
	72	}
	73
	74	return cb_buff;
	75
702df9f1 JC	76	error_free_scan_mask:
702df9f1 JC	77	kfree(cb_buff->buffer.scan_mask);
92d1079b JC	78	error_release_channels:
	79	iio_channel_release_all(cb_buff->channels);
	80	error_free_cb_buff:
	81	kfree(cb_buff);
	82	error_ret:
	83	return ERR_PTR(ret);
	84	}
	85	EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
	86
	87	int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
	88	{
	89	return iio_update_buffers(cb_buff->channels[0].indio_dev,
	90	&cb_buff->buffer,
	91	NULL);
	92	}
	93	EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
	94
	95	void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
	96	{
	97	iio_update_buffers(cb_buff->channels[0].indio_dev,
	98	NULL,
	99	&cb_buff->buffer);
	100	}
	101	EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
	102
	103	void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
	104	{
702df9f1	105	kfree(cb_buff->buffer.scan_mask);
92d1079b JC	106	iio_channel_release_all(cb_buff->channels);
	107	kfree(cb_buff);
	108	}
	109	EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
	110
	111	struct iio_channel
	112	iio_channel_cb_get_channels(const struct iio_cb_buffer cb_buffer)
	113	{
	114	return cb_buffer->channels;
	115	}
	116	EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);