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255 lines
6.9 KiB
255 lines
6.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* usb-urb.c is part of the DVB USB library. |
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* |
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* Copyright (C) 2004-6 Patrick Boettcher ([email protected]) |
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* see dvb-usb-init.c for copyright information. |
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* |
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* This file keeps functions for initializing and handling the |
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* BULK and ISOC USB data transfers in a generic way. |
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* Can be used for DVB-only and also, that's the plan, for |
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* Hybrid USB devices (analog and DVB). |
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*/ |
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#include "dvb-usb-common.h" |
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/* URB stuff for streaming */ |
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static void usb_urb_complete(struct urb *urb) |
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{ |
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struct usb_data_stream *stream = urb->context; |
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int ptype = usb_pipetype(urb->pipe); |
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int i; |
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u8 *b; |
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deb_uxfer("'%s' urb completed. status: %d, length: %d/%d, pack_num: %d, errors: %d\n", |
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ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk", |
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urb->status,urb->actual_length,urb->transfer_buffer_length, |
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urb->number_of_packets,urb->error_count); |
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switch (urb->status) { |
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case 0: /* success */ |
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case -ETIMEDOUT: /* NAK */ |
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break; |
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case -ECONNRESET: /* kill */ |
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case -ENOENT: |
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case -ESHUTDOWN: |
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return; |
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default: /* error */ |
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deb_ts("urb completion error %d.\n", urb->status); |
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break; |
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} |
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b = (u8 *) urb->transfer_buffer; |
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switch (ptype) { |
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case PIPE_ISOCHRONOUS: |
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for (i = 0; i < urb->number_of_packets; i++) { |
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if (urb->iso_frame_desc[i].status != 0) |
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deb_ts("iso frame descriptor has an error: %d\n",urb->iso_frame_desc[i].status); |
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else if (urb->iso_frame_desc[i].actual_length > 0) |
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stream->complete(stream, b + urb->iso_frame_desc[i].offset, urb->iso_frame_desc[i].actual_length); |
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urb->iso_frame_desc[i].status = 0; |
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urb->iso_frame_desc[i].actual_length = 0; |
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} |
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debug_dump(b,20,deb_uxfer); |
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break; |
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case PIPE_BULK: |
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if (urb->actual_length > 0) |
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stream->complete(stream, b, urb->actual_length); |
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break; |
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default: |
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err("unknown endpoint type in completion handler."); |
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return; |
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} |
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usb_submit_urb(urb,GFP_ATOMIC); |
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} |
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int usb_urb_kill(struct usb_data_stream *stream) |
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{ |
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int i; |
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for (i = 0; i < stream->urbs_submitted; i++) { |
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deb_ts("killing URB no. %d.\n",i); |
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/* stop the URB */ |
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usb_kill_urb(stream->urb_list[i]); |
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} |
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stream->urbs_submitted = 0; |
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return 0; |
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} |
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int usb_urb_submit(struct usb_data_stream *stream) |
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{ |
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int i,ret; |
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for (i = 0; i < stream->urbs_initialized; i++) { |
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deb_ts("submitting URB no. %d\n",i); |
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if ((ret = usb_submit_urb(stream->urb_list[i],GFP_ATOMIC))) { |
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err("could not submit URB no. %d - get them all back",i); |
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usb_urb_kill(stream); |
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return ret; |
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} |
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stream->urbs_submitted++; |
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} |
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return 0; |
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} |
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static int usb_free_stream_buffers(struct usb_data_stream *stream) |
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{ |
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if (stream->state & USB_STATE_URB_BUF) { |
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while (stream->buf_num) { |
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stream->buf_num--; |
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deb_mem("freeing buffer %d\n",stream->buf_num); |
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usb_free_coherent(stream->udev, stream->buf_size, |
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stream->buf_list[stream->buf_num], |
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stream->dma_addr[stream->buf_num]); |
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} |
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} |
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stream->state &= ~USB_STATE_URB_BUF; |
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return 0; |
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} |
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static int usb_allocate_stream_buffers(struct usb_data_stream *stream, int num, unsigned long size) |
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{ |
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stream->buf_num = 0; |
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stream->buf_size = size; |
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deb_mem("all in all I will use %lu bytes for streaming\n",num*size); |
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for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) { |
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deb_mem("allocating buffer %d\n",stream->buf_num); |
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if (( stream->buf_list[stream->buf_num] = |
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usb_alloc_coherent(stream->udev, size, GFP_KERNEL, |
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&stream->dma_addr[stream->buf_num]) ) == NULL) { |
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deb_mem("not enough memory for urb-buffer allocation.\n"); |
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usb_free_stream_buffers(stream); |
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return -ENOMEM; |
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} |
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deb_mem("buffer %d: %p (dma: %Lu)\n", |
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stream->buf_num, |
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stream->buf_list[stream->buf_num], (long long)stream->dma_addr[stream->buf_num]); |
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memset(stream->buf_list[stream->buf_num],0,size); |
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stream->state |= USB_STATE_URB_BUF; |
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} |
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deb_mem("allocation successful\n"); |
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return 0; |
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} |
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static int usb_bulk_urb_init(struct usb_data_stream *stream) |
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{ |
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int i, j; |
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if ((i = usb_allocate_stream_buffers(stream,stream->props.count, |
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stream->props.u.bulk.buffersize)) < 0) |
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return i; |
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/* allocate the URBs */ |
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for (i = 0; i < stream->props.count; i++) { |
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stream->urb_list[i] = usb_alloc_urb(0, GFP_KERNEL); |
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if (!stream->urb_list[i]) { |
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deb_mem("not enough memory for urb_alloc_urb!.\n"); |
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for (j = 0; j < i; j++) |
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usb_free_urb(stream->urb_list[j]); |
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return -ENOMEM; |
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} |
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usb_fill_bulk_urb( stream->urb_list[i], stream->udev, |
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usb_rcvbulkpipe(stream->udev,stream->props.endpoint), |
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stream->buf_list[i], |
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stream->props.u.bulk.buffersize, |
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usb_urb_complete, stream); |
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stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
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stream->urb_list[i]->transfer_dma = stream->dma_addr[i]; |
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stream->urbs_initialized++; |
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} |
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return 0; |
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} |
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static int usb_isoc_urb_init(struct usb_data_stream *stream) |
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{ |
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int i,j; |
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if ((i = usb_allocate_stream_buffers(stream,stream->props.count, |
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stream->props.u.isoc.framesize*stream->props.u.isoc.framesperurb)) < 0) |
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return i; |
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/* allocate the URBs */ |
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for (i = 0; i < stream->props.count; i++) { |
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struct urb *urb; |
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int frame_offset = 0; |
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stream->urb_list[i] = usb_alloc_urb(stream->props.u.isoc.framesperurb, GFP_KERNEL); |
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if (!stream->urb_list[i]) { |
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deb_mem("not enough memory for urb_alloc_urb!\n"); |
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for (j = 0; j < i; j++) |
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usb_free_urb(stream->urb_list[j]); |
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return -ENOMEM; |
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} |
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urb = stream->urb_list[i]; |
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urb->dev = stream->udev; |
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urb->context = stream; |
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urb->complete = usb_urb_complete; |
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urb->pipe = usb_rcvisocpipe(stream->udev,stream->props.endpoint); |
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urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
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urb->interval = stream->props.u.isoc.interval; |
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urb->number_of_packets = stream->props.u.isoc.framesperurb; |
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urb->transfer_buffer_length = stream->buf_size; |
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urb->transfer_buffer = stream->buf_list[i]; |
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urb->transfer_dma = stream->dma_addr[i]; |
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for (j = 0; j < stream->props.u.isoc.framesperurb; j++) { |
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urb->iso_frame_desc[j].offset = frame_offset; |
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urb->iso_frame_desc[j].length = stream->props.u.isoc.framesize; |
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frame_offset += stream->props.u.isoc.framesize; |
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} |
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stream->urbs_initialized++; |
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} |
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return 0; |
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} |
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int usb_urb_init(struct usb_data_stream *stream, struct usb_data_stream_properties *props) |
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{ |
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if (stream == NULL || props == NULL) |
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return -EINVAL; |
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memcpy(&stream->props, props, sizeof(*props)); |
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usb_clear_halt(stream->udev,usb_rcvbulkpipe(stream->udev,stream->props.endpoint)); |
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if (stream->complete == NULL) { |
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err("there is no data callback - this doesn't make sense."); |
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return -EINVAL; |
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} |
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switch (stream->props.type) { |
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case USB_BULK: |
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return usb_bulk_urb_init(stream); |
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case USB_ISOC: |
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return usb_isoc_urb_init(stream); |
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default: |
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err("unknown URB-type for data transfer."); |
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return -EINVAL; |
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} |
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} |
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int usb_urb_exit(struct usb_data_stream *stream) |
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{ |
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int i; |
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usb_urb_kill(stream); |
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for (i = 0; i < stream->urbs_initialized; i++) { |
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if (stream->urb_list[i] != NULL) { |
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deb_mem("freeing URB no. %d.\n",i); |
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/* free the URBs */ |
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usb_free_urb(stream->urb_list[i]); |
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} |
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} |
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stream->urbs_initialized = 0; |
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usb_free_stream_buffers(stream); |
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return 0; |
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}
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