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Commit 6870ab57 authored by Patrick Boettcher's avatar Patrick Boettcher Committed by Mauro Carvalho Chehab
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V4L/DVB (4645): Added new file for multiple input rewrite 



Forgot to add usb-urb.c which is new after adding support for multiple inputs

Signed-off-by: default avatarPatrick Boettcher <pb@linuxtv.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent c19da7ef

drivers/media/dvb/dvb-usb/usb-urb.c

0 → 100644
+242 −0
Original line number Diff line number Diff line 
/* 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 */

static void usb_urb_complete(struct urb *urb, struct pt_regs *ptregs)

{

	struct usb_data_stream *stream = urb->context;

	int ptype = usb_pipetype(urb->pipe);

	int i;

	u8 *b;



	deb_uxfer("'%s' urb completed. status: %d, length: %d/%d, pack_num: %d, errors: %d\n",

		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 */

			deb_ts("urb completition error %d.\n", 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)

					deb_ts("iso frame descriptor has an error: %d\n",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;

			}

			debug_dump(b,20,deb_uxfer);

			break;

		case PIPE_BULK:

			if (urb->actual_length > 0)

				stream->complete(stream, b, urb->actual_length);

			break;

		default:

			err("unkown endpoint type in completition handler.");

			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++) {

		deb_ts("killing URB no. %d.\n",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)

{

	int i,ret;

	for (i = 0; i < stream->urbs_initialized; i++) {

		deb_ts("submitting URB no. %d\n",i);

		if ((ret = usb_submit_urb(stream->urb_list[i],GFP_ATOMIC))) {

			err("could not submit URB no. %d - get them all back",i);

			usb_urb_kill(stream);

			return ret;

		}

		stream->urbs_submitted++;

	}

	return 0;

}



static int usb_free_stream_buffers(struct usb_data_stream *stream)

{

	if (stream->state & USB_STATE_URB_BUF) {

		while (stream->buf_num) {

			stream->buf_num--;

			deb_mem("freeing buffer %d\n",stream->buf_num);

			usb_buffer_free(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;

}



static int usb_allocate_stream_buffers(struct usb_data_stream *stream, int num, unsigned long size)

{

	stream->buf_num = 0;

	stream->buf_size = size;



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



	for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {

		deb_mem("allocating buffer %d\n",stream->buf_num);

		if (( stream->buf_list[stream->buf_num] =

					usb_buffer_alloc(stream->udev, size, SLAB_ATOMIC,

					&stream->dma_addr[stream->buf_num]) ) == NULL) {

			deb_mem("not enough memory for urb-buffer allocation.\n");

			usb_free_stream_buffers(stream);

			return -ENOMEM;

		}

		deb_mem("buffer %d: %p (dma: %ld)\n",

			stream->buf_num, stream->buf_list[stream->buf_num], stream->dma_addr[stream->buf_num]);

		memset(stream->buf_list[stream->buf_num],0,size);

		stream->state |= USB_STATE_URB_BUF;

	}

	deb_mem("allocation successful\n");



	return 0;

}



static int usb_bulk_urb_init(struct usb_data_stream *stream)

{

	int i;



	if ((i = usb_allocate_stream_buffers(stream,stream->props.count,

					stream->props.u.bulk.buffersize)) < 0)

		return i;



	/* allocate the URBs */

	for (i = 0; i < stream->props.count; i++) {

		if ((stream->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC)) == NULL)

			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 = 0;

		stream->urbs_initialized++;

	}

	return 0;

}



static int usb_isoc_urb_init(struct usb_data_stream *stream)

{

	int i,j;



	if ((i = usb_allocate_stream_buffers(stream,stream->props.count,

					stream->props.u.isoc.framesize*stream->props.u.isoc.framesperurb)) < 0)

		return i;



	/* allocate the URBs */

	for (i = 0; i < stream->props.count; i++) {

		struct urb *urb;

		int frame_offset = 0;

		if ((stream->urb_list[i] =

					usb_alloc_urb(stream->props.u.isoc.framesperurb,GFP_ATOMIC)) == NULL)

			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->buf_size;

		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_urb_init(struct usb_data_stream *stream, struct usb_data_stream_properties *props)

{

	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) {

		err("there is no data callback - this doesn't make sense.");

		return -EINVAL;

	}



	switch (stream->props.type) {

		case USB_BULK:

			return usb_bulk_urb_init(stream);

		case USB_ISOC:

			return usb_isoc_urb_init(stream);

		default:

			err("unkown URB-type for data transfer.");

			return -EINVAL;

	}

}



int usb_urb_exit(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) {

			deb_mem("freeing URB no. %d.\n",i);

			/* free the URBs */

			usb_free_urb(stream->urb_list[i]);

		}

	}

	stream->urbs_initialized = 0;



	usb_free_stream_buffers(stream);

	return 0;

}