--- /dev/null
+/* 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;
+}
projects / linux-2.6 / commitdiff