| /* 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: %u)\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; |
| } |