[deliverable/linux.git] / drivers / media / dvb / dvb-usb / usb_urb.c

/* usb-urb.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
 * see dvb-usb-init.c for copyright information.
 *
 * This file keeps functions for initializing and handling the
 * BULK and ISOC USB data transfers in a generic way.
 * Can be used for DVB-only and also, that's the plan, for
 * Hybrid USB devices (analog and DVB).
 */
#include "dvb_usb_common.h"

/* URB stuff for streaming */

int usb_urb_reconfig(struct usb_data_stream *stream,
		struct usb_data_stream_properties *props);

static void usb_urb_complete(struct urb *urb)
{
	struct usb_data_stream *stream = urb->context;
	int ptype = usb_pipetype(urb->pipe);
	int i;
	u8 *b;

	pr_debug("%s: %s urb completed status=%d length=%d/%d" \
			" pack_num=%d errors=%d\n", __func__,
			ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",
			urb->status, urb->actual_length,
			urb->transfer_buffer_length,
			urb->number_of_packets, urb->error_count);

	switch (urb->status) {
	case 0:         /* success */
	case -ETIMEDOUT:    /* NAK */
		break;
	case -ECONNRESET:   /* kill */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	default:        /* error */
		pr_debug("%s: URB completition failed=%d\n", __func__,
				urb->status);
		break;
	}

	b = (u8 *) urb->transfer_buffer;
	switch (ptype) {
	case PIPE_ISOCHRONOUS:
		for (i = 0; i < urb->number_of_packets; i++) {
			if (urb->iso_frame_desc[i].status != 0)
				pr_debug("%s: iso frame descriptor has an " \
						"error=%d\n", __func__,
						urb->iso_frame_desc[i].status);
			else if (urb->iso_frame_desc[i].actual_length > 0)
				stream->complete(stream,
					b + urb->iso_frame_desc[i].offset,
					urb->iso_frame_desc[i].actual_length);

			urb->iso_frame_desc[i].status = 0;
			urb->iso_frame_desc[i].actual_length = 0;
		}
		break;
	case PIPE_BULK:
		if (urb->actual_length > 0)
			stream->complete(stream, b, urb->actual_length);
		break;
	default:
		pr_err("%s: unknown endpoint type in completition handler",
				KBUILD_MODNAME);
		return;
	}
	usb_submit_urb(urb, GFP_ATOMIC);
}

int usb_urb_kill(struct usb_data_stream *stream)
{
	int i;
	for (i = 0; i < stream->urbs_submitted; i++) {
		pr_debug("%s: kill URB=%d\n", __func__, i);
		/* stop the URB */
		usb_kill_urb(stream->urb_list[i]);
	}
	stream->urbs_submitted = 0;
	return 0;
}

int usb_urb_submit(struct usb_data_stream *stream,
		struct usb_data_stream_properties *props)
{
	int i, ret;

	if (props) {
		ret = usb_urb_reconfig(stream, props);
		if (ret < 0)
			return ret;
	}

	for (i = 0; i < stream->urbs_initialized; i++) {
		pr_debug("%s: submit URB=%d\n", __func__, i);
		ret = usb_submit_urb(stream->urb_list[i], GFP_ATOMIC);
		if (ret) {
			pr_err("%s: could not submit URB no. %d - get them " \
					"all back", KBUILD_MODNAME, i);
			usb_urb_kill(stream);
			return ret;
		}
		stream->urbs_submitted++;
	}
	return 0;
}

int usb_urb_free_urbs(struct usb_data_stream *stream)
{
	int i;

	usb_urb_kill(stream);

	for (i = 0; i < stream->urbs_initialized; i++) {
		if (stream->urb_list[i] != NULL) {
			pr_debug("%s: free URB=%d\n", __func__, i);
			/* free the URBs */
			usb_free_urb(stream->urb_list[i]);
		}
	}
	stream->urbs_initialized = 0;

	return 0;
}

static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)
{
	int i, j;

	/* allocate the URBs */
	for (i = 0; i < stream->props.count; i++) {
		pr_debug("%s: alloc URB=%d\n", __func__, i);
		stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
		if (!stream->urb_list[i]) {
			pr_debug("%s: failed\n", __func__);
			for (j = 0; j < i; j++)
				usb_free_urb(stream->urb_list[j]);
			return -ENOMEM;
		}
		usb_fill_bulk_urb(stream->urb_list[i],
				stream->udev,
				usb_rcvbulkpipe(stream->udev,
						stream->props.endpoint),
				stream->buf_list[i],
				stream->props.u.bulk.buffersize,
				usb_urb_complete, stream);

		stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
		stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
		stream->urbs_initialized++;
	}
	return 0;
}

static int usb_urb_alloc_isoc_urbs(struct usb_data_stream *stream)
{
	int i, j;

	/* allocate the URBs */
	for (i = 0; i < stream->props.count; i++) {
		struct urb *urb;
		int frame_offset = 0;
		pr_debug("%s: alloc URB=%d\n", __func__, i);
		stream->urb_list[i] = usb_alloc_urb(
				stream->props.u.isoc.framesperurb, GFP_ATOMIC);
		if (!stream->urb_list[i]) {
			pr_debug("%s: failed\n", __func__);
			for (j = 0; j < i; j++)
				usb_free_urb(stream->urb_list[j]);
			return -ENOMEM;
		}

		urb = stream->urb_list[i];

		urb->dev = stream->udev;
		urb->context = stream;
		urb->complete = usb_urb_complete;
		urb->pipe = usb_rcvisocpipe(stream->udev,
				stream->props.endpoint);
		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
		urb->interval = stream->props.u.isoc.interval;
		urb->number_of_packets = stream->props.u.isoc.framesperurb;
		urb->transfer_buffer_length = stream->props.u.isoc.framesize *
				stream->props.u.isoc.framesperurb;
		urb->transfer_buffer = stream->buf_list[i];
		urb->transfer_dma = stream->dma_addr[i];

		for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
			urb->iso_frame_desc[j].offset = frame_offset;
			urb->iso_frame_desc[j].length =
					stream->props.u.isoc.framesize;
			frame_offset += stream->props.u.isoc.framesize;
		}

		stream->urbs_initialized++;
	}
	return 0;
}

int usb_free_stream_buffers(struct usb_data_stream *stream)
{
	if (stream->state & USB_STATE_URB_BUF) {
		while (stream->buf_num) {
			stream->buf_num--;
			pr_debug("%s: free buf=%d\n", __func__,
				stream->buf_num);
			usb_free_coherent(stream->udev, stream->buf_size,
					  stream->buf_list[stream->buf_num],
					  stream->dma_addr[stream->buf_num]);
		}
	}

	stream->state &= ~USB_STATE_URB_BUF;

	return 0;
}

int usb_alloc_stream_buffers(struct usb_data_stream *stream, int num,
		unsigned long size)
{
	stream->buf_num = 0;
	stream->buf_size = size;

	pr_debug("%s: all in all I will use %lu bytes for streaming\n",
			__func__,  num * size);

	for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
		pr_debug("%s: alloc buf=%d\n", __func__, stream->buf_num);
		stream->buf_list[stream->buf_num] = usb_alloc_coherent(
				stream->udev, size, GFP_ATOMIC,
				&stream->dma_addr[stream->buf_num]);
		if (stream->buf_list[stream->buf_num] == NULL) {
			pr_debug("%s: failed\n", __func__);
			usb_free_stream_buffers(stream);
			return -ENOMEM;
		}

		pr_debug("%s: buf %d: %p (dma %llu)\n", __func__,
				stream->buf_num,
				stream->buf_list[stream->buf_num],
				(long long)stream->dma_addr[stream->buf_num]);
		memset(stream->buf_list[stream->buf_num], 0, size);
		stream->state |= USB_STATE_URB_BUF;
	}

	return 0;
}

int usb_urb_reconfig(struct usb_data_stream *stream,
		struct usb_data_stream_properties *props)
{
	int buf_size;

	if (props == NULL)
		return 0;

	/* check allocated buffers are large enough for the request */
	if (props->type == USB_BULK) {
		buf_size = stream->props.u.bulk.buffersize;
	} else if (props->type == USB_ISOC) {
		buf_size = props->u.isoc.framesize * props->u.isoc.framesperurb;
	} else {
		pr_err("%s: invalid endpoint type=%d", KBUILD_MODNAME,
				props->type);
		return -EINVAL;
	}

	if (stream->buf_num < props->count || stream->buf_size < buf_size) {
		pr_err("%s: cannot reconfigure as allocated buffers are too " \
				"small", KBUILD_MODNAME);
		return -EINVAL;
	}

	/* check if all fields are same */
	if (stream->props.type == props->type &&
			stream->props.count == props->count &&
			stream->props.endpoint == props->endpoint) {
		if (props->type == USB_BULK &&
				props->u.bulk.buffersize ==
				stream->props.u.bulk.buffersize)
			return 0;
		else if (props->type == USB_ISOC &&
				props->u.isoc.framesperurb ==
				stream->props.u.isoc.framesperurb &&
				props->u.isoc.framesize ==
				stream->props.u.isoc.framesize &&
				props->u.isoc.interval ==
				stream->props.u.isoc.interval)
			return 0;
	}

	pr_debug("%s: re-alloc URBs\n", __func__);

	usb_urb_free_urbs(stream);
	memcpy(&stream->props, props, sizeof(*props));
	if (props->type == USB_BULK)
		return usb_urb_alloc_bulk_urbs(stream);
	else if (props->type == USB_ISOC)
		return usb_urb_alloc_isoc_urbs(stream);

	return 0;
}

int usb_urb_init(struct usb_data_stream *stream,
		struct usb_data_stream_properties *props)
{
	int ret;

	if (stream == NULL || props == NULL)
		return -EINVAL;

	memcpy(&stream->props, props, sizeof(*props));

	usb_clear_halt(stream->udev, usb_rcvbulkpipe(stream->udev,
			stream->props.endpoint));

	if (stream->complete == NULL) {
		pr_err("%s: there is no data callback - this doesn't make " \
				"sense", KBUILD_MODNAME);
		return -EINVAL;
	}

	switch (stream->props.type) {
	case USB_BULK:
		ret = usb_alloc_stream_buffers(stream, stream->props.count,
				stream->props.u.bulk.buffersize);
		if (ret < 0)
			return ret;

		return usb_urb_alloc_bulk_urbs(stream);
	case USB_ISOC:
		ret = usb_alloc_stream_buffers(stream, stream->props.count,
				stream->props.u.isoc.framesize *
				stream->props.u.isoc.framesperurb);
		if (ret < 0)
			return ret;

		return usb_urb_alloc_isoc_urbs(stream);
	default:
		pr_err("%s: unknown URB-type for data transfer",
				KBUILD_MODNAME);
		return -EINVAL;
	}
}

int usb_urb_exit(struct usb_data_stream *stream)
{
	usb_urb_free_urbs(stream);
	usb_free_stream_buffers(stream);

	return 0;
}
Commit	Line	Data
c79b339f AP	1	/* usb-urb.c is part of the DVB USB library.
	2	*
	3	* Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
	4	* see dvb-usb-init.c for copyright information.
	5	*
	6	* This file keeps functions for initializing and handling the
	7	* BULK and ISOC USB data transfers in a generic way.
	8	* Can be used for DVB-only and also, that's the plan, for
	9	* Hybrid USB devices (analog and DVB).
	10	*/
	11	#include "dvb_usb_common.h"
	12
	13	/* URB stuff for streaming */
bce1c029 AP	14
	15	int usb_urb_reconfig(struct usb_data_stream *stream,
	16	struct usb_data_stream_properties *props);
	17
c79b339f AP	18	static void usb_urb_complete(struct urb *urb)
	19	{
	20	struct usb_data_stream *stream = urb->context;
	21	int ptype = usb_pipetype(urb->pipe);
	22	int i;
	23	u8 *b;
	24
23d8e63a AP	25	pr_debug("%s: %s urb completed status=%d length=%d/%d" \
	26	" pack_num=%d errors=%d\n", __func__,
	27	ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",
	28	urb->status, urb->actual_length,
	29	urb->transfer_buffer_length,
	30	urb->number_of_packets, urb->error_count);
c79b339f AP	31
c79b339f AP	32	switch (urb->status) {
4e60d951 AP	33	case 0: /* success */
	34	case -ETIMEDOUT: /* NAK */
	35	break;
	36	case -ECONNRESET: /* kill */
	37	case -ENOENT:
	38	case -ESHUTDOWN:
	39	return;
	40	default: /* error */
15072bba AP	41	pr_debug("%s: URB completition failed=%d\n", __func__,
15072bba AP	42	urb->status);
4e60d951	43	break;
c79b339f AP	44	}
	45
	46	b = (u8 *) urb->transfer_buffer;
	47	switch (ptype) {
4e60d951 AP	48	case PIPE_ISOCHRONOUS:
	49	for (i = 0; i < urb->number_of_packets; i++) {
	50	if (urb->iso_frame_desc[i].status != 0)
23d8e63a AP	51	pr_debug("%s: iso frame descriptor has an " \
23d8e63a AP	52	"error=%d\n", __func__,
15072bba	53	urb->iso_frame_desc[i].status);
4e60d951 AP	54	else if (urb->iso_frame_desc[i].actual_length > 0)
	55	stream->complete(stream,
	56	b + urb->iso_frame_desc[i].offset,
	57	urb->iso_frame_desc[i].actual_length);
	58
	59	urb->iso_frame_desc[i].status = 0;
	60	urb->iso_frame_desc[i].actual_length = 0;
	61	}
4e60d951 AP	62	break;
	63	case PIPE_BULK:
	64	if (urb->actual_length > 0)
	65	stream->complete(stream, b, urb->actual_length);
	66	break;
	67	default:
23d8e63a AP	68	pr_err("%s: unknown endpoint type in completition handler",
23d8e63a AP	69	KBUILD_MODNAME);
4e60d951	70	return;
c79b339f	71	}
4e60d951	72	usb_submit_urb(urb, GFP_ATOMIC);
c79b339f AP	73	}
	74
	75	int usb_urb_kill(struct usb_data_stream *stream)
	76	{
	77	int i;
	78	for (i = 0; i < stream->urbs_submitted; i++) {
15072bba	79	pr_debug("%s: kill URB=%d\n", __func__, i);
c79b339f AP	80	/* stop the URB */
	81	usb_kill_urb(stream->urb_list[i]);
	82	}
	83	stream->urbs_submitted = 0;
	84	return 0;
	85	}
	86
bce1c029 AP	87	int usb_urb_submit(struct usb_data_stream *stream,
bce1c029 AP	88	struct usb_data_stream_properties *props)
c79b339f	89	{
4e60d951	90	int i, ret;
bce1c029 AP	91
	92	if (props) {
	93	ret = usb_urb_reconfig(stream, props);
	94	if (ret < 0)
	95	return ret;
	96	}
	97
c79b339f	98	for (i = 0; i < stream->urbs_initialized; i++) {
15072bba	99	pr_debug("%s: submit URB=%d\n", __func__, i);
4e60d951 AP	100	ret = usb_submit_urb(stream->urb_list[i], GFP_ATOMIC);
4e60d951 AP	101	if (ret) {
23d8e63a AP	102	pr_err("%s: could not submit URB no. %d - get them " \
23d8e63a AP	103	"all back", KBUILD_MODNAME, i);
c79b339f AP	104	usb_urb_kill(stream);
	105	return ret;
	106	}
	107	stream->urbs_submitted++;
	108	}
	109	return 0;
	110	}
	111
bce1c029	112	int usb_urb_free_urbs(struct usb_data_stream *stream)
c79b339f	113	{
bce1c029	114	int i;
c79b339f	115
bce1c029	116	usb_urb_kill(stream);
c79b339f	117
bce1c029 AP	118	for (i = 0; i < stream->urbs_initialized; i++) {
bce1c029 AP	119	if (stream->urb_list[i] != NULL) {
bce1c029 AP	120	pr_debug("%s: free URB=%d\n", __func__, i);
	121	/* free the URBs */
	122	usb_free_urb(stream->urb_list[i]);
c79b339f	123	}
c79b339f	124	}
bce1c029	125	stream->urbs_initialized = 0;
c79b339f AP	126
	127	return 0;
	128	}
	129
bce1c029	130	static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)
c79b339f AP	131	{
	132	int i, j;
	133
c79b339f AP	134	/* allocate the URBs */
c79b339f AP	135	for (i = 0; i < stream->props.count; i++) {
bce1c029	136	pr_debug("%s: alloc URB=%d\n", __func__, i);
c79b339f AP	137	stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
c79b339f AP	138	if (!stream->urb_list[i]) {
15072bba	139	pr_debug("%s: failed\n", __func__);
c79b339f AP	140	for (j = 0; j < i; j++)
	141	usb_free_urb(stream->urb_list[j]);
	142	return -ENOMEM;
	143	}
bce1c029 AP	144	usb_fill_bulk_urb(stream->urb_list[i],
bce1c029 AP	145	stream->udev,
4e60d951	146	usb_rcvbulkpipe(stream->udev,
bce1c029	147	stream->props.endpoint),
c79b339f AP	148	stream->buf_list[i],
	149	stream->props.u.bulk.buffersize,
	150	usb_urb_complete, stream);
	151
	152	stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
	153	stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
	154	stream->urbs_initialized++;
	155	}
	156	return 0;
	157	}
	158
bce1c029	159	static int usb_urb_alloc_isoc_urbs(struct usb_data_stream *stream)
c79b339f	160	{
4e60d951	161	int i, j;
c79b339f	162
c79b339f AP	163	/* allocate the URBs */
	164	for (i = 0; i < stream->props.count; i++) {
	165	struct urb *urb;
	166	int frame_offset = 0;
bce1c029	167	pr_debug("%s: alloc URB=%d\n", __func__, i);
4e60d951 AP	168	stream->urb_list[i] = usb_alloc_urb(
4e60d951 AP	169	stream->props.u.isoc.framesperurb, GFP_ATOMIC);
c79b339f	170	if (!stream->urb_list[i]) {
15072bba	171	pr_debug("%s: failed\n", __func__);
c79b339f AP	172	for (j = 0; j < i; j++)
	173	usb_free_urb(stream->urb_list[j]);
	174	return -ENOMEM;
	175	}
	176
	177	urb = stream->urb_list[i];
	178
	179	urb->dev = stream->udev;
	180	urb->context = stream;
	181	urb->complete = usb_urb_complete;
4e60d951 AP	182	urb->pipe = usb_rcvisocpipe(stream->udev,
4e60d951 AP	183	stream->props.endpoint);
c79b339f AP	184	urb->transfer_flags = URB_ISO_ASAP \| URB_NO_TRANSFER_DMA_MAP;
	185	urb->interval = stream->props.u.isoc.interval;
	186	urb->number_of_packets = stream->props.u.isoc.framesperurb;
bce1c029 AP	187	urb->transfer_buffer_length = stream->props.u.isoc.framesize *
bce1c029 AP	188	stream->props.u.isoc.framesperurb;
c79b339f AP	189	urb->transfer_buffer = stream->buf_list[i];
	190	urb->transfer_dma = stream->dma_addr[i];
	191
	192	for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
	193	urb->iso_frame_desc[j].offset = frame_offset;
4e60d951 AP	194	urb->iso_frame_desc[j].length =
4e60d951 AP	195	stream->props.u.isoc.framesize;
c79b339f AP	196	frame_offset += stream->props.u.isoc.framesize;
	197	}
	198
	199	stream->urbs_initialized++;
	200	}
	201	return 0;
	202	}
	203
bce1c029 AP	204	int usb_free_stream_buffers(struct usb_data_stream *stream)
	205	{
	206	if (stream->state & USB_STATE_URB_BUF) {
	207	while (stream->buf_num) {
	208	stream->buf_num--;
15072bba AP	209	pr_debug("%s: free buf=%d\n", __func__,
15072bba AP	210	stream->buf_num);
bce1c029 AP	211	usb_free_coherent(stream->udev, stream->buf_size,
	212	stream->buf_list[stream->buf_num],
	213	stream->dma_addr[stream->buf_num]);
	214	}
	215	}
	216
	217	stream->state &= ~USB_STATE_URB_BUF;
	218
	219	return 0;
	220	}
	221
	222	int usb_alloc_stream_buffers(struct usb_data_stream *stream, int num,
	223	unsigned long size)
	224	{
	225	stream->buf_num = 0;
	226	stream->buf_size = size;
	227
15072bba AP	228	pr_debug("%s: all in all I will use %lu bytes for streaming\n",
15072bba AP	229	__func__, num * size);
bce1c029 AP	230
bce1c029 AP	231	for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
15072bba	232	pr_debug("%s: alloc buf=%d\n", __func__, stream->buf_num);
bce1c029 AP	233	stream->buf_list[stream->buf_num] = usb_alloc_coherent(
	234	stream->udev, size, GFP_ATOMIC,
	235	&stream->dma_addr[stream->buf_num]);
	236	if (stream->buf_list[stream->buf_num] == NULL) {
15072bba	237	pr_debug("%s: failed\n", __func__);
bce1c029 AP	238	usb_free_stream_buffers(stream);
	239	return -ENOMEM;
	240	}
15072bba AP	241
15072bba AP	242	pr_debug("%s: buf %d: %p (dma %llu)\n", __func__,
bce1c029 AP	243	stream->buf_num,
	244	stream->buf_list[stream->buf_num],
	245	(long long)stream->dma_addr[stream->buf_num]);
	246	memset(stream->buf_list[stream->buf_num], 0, size);
	247	stream->state \|= USB_STATE_URB_BUF;
	248	}
bce1c029 AP	249
	250	return 0;
	251	}
	252
	253	int usb_urb_reconfig(struct usb_data_stream *stream,
	254	struct usb_data_stream_properties *props)
	255	{
	256	int buf_size;
	257
	258	if (props == NULL)
	259	return 0;
	260
	261	/* check allocated buffers are large enough for the request */
15072bba	262	if (props->type == USB_BULK) {
bce1c029	263	buf_size = stream->props.u.bulk.buffersize;
15072bba	264	} else if (props->type == USB_ISOC) {
bce1c029	265	buf_size = props->u.isoc.framesize * props->u.isoc.framesperurb;
15072bba	266	} else {
23d8e63a AP	267	pr_err("%s: invalid endpoint type=%d", KBUILD_MODNAME,
23d8e63a AP	268	props->type);
bce1c029	269	return -EINVAL;
15072bba	270	}
bce1c029 AP	271
bce1c029 AP	272	if (stream->buf_num < props->count \|\| stream->buf_size < buf_size) {
23d8e63a AP	273	pr_err("%s: cannot reconfigure as allocated buffers are too " \
23d8e63a AP	274	"small", KBUILD_MODNAME);
bce1c029 AP	275	return -EINVAL;
	276	}
	277
	278	/* check if all fields are same */
	279	if (stream->props.type == props->type &&
	280	stream->props.count == props->count &&
	281	stream->props.endpoint == props->endpoint) {
	282	if (props->type == USB_BULK &&
	283	props->u.bulk.buffersize ==
	284	stream->props.u.bulk.buffersize)
	285	return 0;
	286	else if (props->type == USB_ISOC &&
	287	props->u.isoc.framesperurb ==
	288	stream->props.u.isoc.framesperurb &&
	289	props->u.isoc.framesize ==
	290	stream->props.u.isoc.framesize &&
	291	props->u.isoc.interval ==
	292	stream->props.u.isoc.interval)
	293	return 0;
	294	}
	295
	296	pr_debug("%s: re-alloc URBs\n", __func__);
	297
	298	usb_urb_free_urbs(stream);
	299	memcpy(&stream->props, props, sizeof(*props));
	300	if (props->type == USB_BULK)
	301	return usb_urb_alloc_bulk_urbs(stream);
	302	else if (props->type == USB_ISOC)
	303	return usb_urb_alloc_isoc_urbs(stream);
	304
	305	return 0;
	306	}
	307
4e60d951 AP	308	int usb_urb_init(struct usb_data_stream *stream,
4e60d951 AP	309	struct usb_data_stream_properties *props)
c79b339f	310	{
bce1c029 AP	311	int ret;
bce1c029 AP	312
c79b339f AP	313	if (stream == NULL \|\| props == NULL)
	314	return -EINVAL;
	315
	316	memcpy(&stream->props, props, sizeof(*props));
	317
4e60d951 AP	318	usb_clear_halt(stream->udev, usb_rcvbulkpipe(stream->udev,
4e60d951 AP	319	stream->props.endpoint));
c79b339f AP	320
c79b339f AP	321	if (stream->complete == NULL) {
23d8e63a AP	322	pr_err("%s: there is no data callback - this doesn't make " \
23d8e63a AP	323	"sense", KBUILD_MODNAME);
c79b339f AP	324	return -EINVAL;
	325	}
	326
	327	switch (stream->props.type) {
4e60d951	328	case USB_BULK:
bce1c029 AP	329	ret = usb_alloc_stream_buffers(stream, stream->props.count,
	330	stream->props.u.bulk.buffersize);
	331	if (ret < 0)
	332	return ret;
	333
	334	return usb_urb_alloc_bulk_urbs(stream);
4e60d951	335	case USB_ISOC:
bce1c029 AP	336	ret = usb_alloc_stream_buffers(stream, stream->props.count,
	337	stream->props.u.isoc.framesize *
	338	stream->props.u.isoc.framesperurb);
	339	if (ret < 0)
	340	return ret;
	341
	342	return usb_urb_alloc_isoc_urbs(stream);
4e60d951	343	default:
23d8e63a AP	344	pr_err("%s: unknown URB-type for data transfer",
23d8e63a AP	345	KBUILD_MODNAME);
4e60d951	346	return -EINVAL;
c79b339f AP	347	}
	348	}
	349
	350	int usb_urb_exit(struct usb_data_stream *stream)
	351	{
bce1c029	352	usb_urb_free_urbs(stream);
c79b339f	353	usb_free_stream_buffers(stream);
bce1c029	354
c79b339f AP	355	return 0;
c79b339f AP	356	}