diff options
| -rw-r--r-- | drivers/media/dvb/dvb-usb/usb-urb.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-usb/usb-urb.c b/drivers/media/dvb/dvb-usb/usb-urb.c new file mode 100644 index 00000000000..f2f3bb6044a --- /dev/null +++ b/drivers/media/dvb/dvb-usb/usb-urb.c @@ -0,0 +1,242 @@ +/* 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; +} |