354 lines
9 KiB
C
354 lines
9 KiB
C
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// 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 (patrick.boettcher@posteo.de)
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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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int usb_urb_reconfig(struct usb_data_stream *stream,
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struct usb_data_stream_properties *props);
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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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dev_dbg_ratelimited(&stream->udev->dev,
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"%s: %s urb completed status=%d length=%d/%d pack_num=%d errors=%d\n",
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__func__, ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",
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urb->status, urb->actual_length,
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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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dev_dbg_ratelimited(&stream->udev->dev,
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"%s: urb completion failed=%d\n",
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__func__, 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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dev_dbg(&stream->udev->dev,
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"%s: iso frame descriptor has an error=%d\n",
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__func__,
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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,
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b + urb->iso_frame_desc[i].offset,
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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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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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dev_err(&stream->udev->dev,
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"%s: unknown endpoint type in completion handler\n",
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KBUILD_MODNAME);
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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_killv2(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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dev_dbg(&stream->udev->dev, "%s: kill urb=%d\n", __func__, 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_submitv2(struct usb_data_stream *stream,
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struct usb_data_stream_properties *props)
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{
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int i, ret;
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if (props) {
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ret = usb_urb_reconfig(stream, props);
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if (ret < 0)
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return ret;
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}
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for (i = 0; i < stream->urbs_initialized; i++) {
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dev_dbg(&stream->udev->dev, "%s: submit urb=%d\n", __func__, i);
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ret = usb_submit_urb(stream->urb_list[i], GFP_ATOMIC);
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if (ret) {
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dev_err(&stream->udev->dev,
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"%s: could not submit urb no. %d - get them all back\n",
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KBUILD_MODNAME, i);
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usb_urb_killv2(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_urb_free_urbs(struct usb_data_stream *stream)
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{
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int i;
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usb_urb_killv2(stream);
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for (i = stream->urbs_initialized - 1; i >= 0; i--) {
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if (stream->urb_list[i]) {
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dev_dbg(&stream->udev->dev, "%s: free urb=%d\n",
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__func__, 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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return 0;
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}
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static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)
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{
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int i, j;
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/* allocate the URBs */
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for (i = 0; i < stream->props.count; i++) {
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dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);
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stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
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if (!stream->urb_list[i]) {
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dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);
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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],
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stream->udev,
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usb_rcvbulkpipe(stream->udev,
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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->urbs_initialized++;
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}
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return 0;
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}
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static int usb_urb_alloc_isoc_urbs(struct usb_data_stream *stream)
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{
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int i, j;
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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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dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);
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stream->urb_list[i] = usb_alloc_urb(
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stream->props.u.isoc.framesperurb, GFP_ATOMIC);
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if (!stream->urb_list[i]) {
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dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);
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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,
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stream->props.endpoint);
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urb->transfer_flags = URB_ISO_ASAP;
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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->props.u.isoc.framesize *
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stream->props.u.isoc.framesperurb;
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urb->transfer_buffer = stream->buf_list[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 =
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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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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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kfree(stream->buf_list[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_alloc_stream_buffers(struct usb_data_stream *stream, int num,
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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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dev_dbg(&stream->udev->dev,
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"%s: all in all I will use %lu bytes for streaming\n",
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__func__, num * size);
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for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
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stream->buf_list[stream->buf_num] = kzalloc(size, GFP_ATOMIC);
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if (!stream->buf_list[stream->buf_num]) {
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dev_dbg(&stream->udev->dev, "%s: alloc buf=%d failed\n",
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__func__, stream->buf_num);
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usb_free_stream_buffers(stream);
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return -ENOMEM;
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}
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dev_dbg(&stream->udev->dev, "%s: alloc buf=%d %p (dma %llu)\n",
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__func__, stream->buf_num,
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stream->buf_list[stream->buf_num],
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(long long)stream->dma_addr[stream->buf_num]);
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stream->state |= USB_STATE_URB_BUF;
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}
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return 0;
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}
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int usb_urb_reconfig(struct usb_data_stream *stream,
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struct usb_data_stream_properties *props)
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{
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int buf_size;
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if (!props)
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return 0;
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/* check allocated buffers are large enough for the request */
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if (props->type == USB_BULK) {
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buf_size = stream->props.u.bulk.buffersize;
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} else if (props->type == USB_ISOC) {
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buf_size = props->u.isoc.framesize * props->u.isoc.framesperurb;
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} else {
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dev_err(&stream->udev->dev, "%s: invalid endpoint type=%d\n",
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KBUILD_MODNAME, props->type);
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return -EINVAL;
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}
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if (stream->buf_num < props->count || stream->buf_size < buf_size) {
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dev_err(&stream->udev->dev,
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"%s: cannot reconfigure as allocated buffers are too small\n",
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KBUILD_MODNAME);
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return -EINVAL;
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}
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/* check if all fields are same */
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if (stream->props.type == props->type &&
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stream->props.count == props->count &&
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stream->props.endpoint == props->endpoint) {
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if (props->type == USB_BULK &&
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props->u.bulk.buffersize ==
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stream->props.u.bulk.buffersize)
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return 0;
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else if (props->type == USB_ISOC &&
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props->u.isoc.framesperurb ==
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stream->props.u.isoc.framesperurb &&
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props->u.isoc.framesize ==
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stream->props.u.isoc.framesize &&
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props->u.isoc.interval ==
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stream->props.u.isoc.interval)
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return 0;
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}
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dev_dbg(&stream->udev->dev, "%s: re-alloc urbs\n", __func__);
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usb_urb_free_urbs(stream);
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memcpy(&stream->props, props, sizeof(*props));
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if (props->type == USB_BULK)
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return usb_urb_alloc_bulk_urbs(stream);
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else if (props->type == USB_ISOC)
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return usb_urb_alloc_isoc_urbs(stream);
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return 0;
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}
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int usb_urb_initv2(struct usb_data_stream *stream,
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const struct usb_data_stream_properties *props)
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{
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int ret;
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if (!stream || !props)
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return -EINVAL;
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memcpy(&stream->props, props, sizeof(*props));
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if (!stream->complete) {
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dev_err(&stream->udev->dev,
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"%s: there is no data callback - this doesn't make sense\n",
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KBUILD_MODNAME);
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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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ret = usb_alloc_stream_buffers(stream, stream->props.count,
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stream->props.u.bulk.buffersize);
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if (ret < 0)
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return ret;
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return usb_urb_alloc_bulk_urbs(stream);
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case USB_ISOC:
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ret = usb_alloc_stream_buffers(stream, stream->props.count,
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stream->props.u.isoc.framesize *
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stream->props.u.isoc.framesperurb);
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if (ret < 0)
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return ret;
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return usb_urb_alloc_isoc_urbs(stream);
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default:
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dev_err(&stream->udev->dev,
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"%s: unknown urb-type for data transfer\n",
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KBUILD_MODNAME);
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return -EINVAL;
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}
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}
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int usb_urb_exitv2(struct usb_data_stream *stream)
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{
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usb_urb_free_urbs(stream);
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usb_free_stream_buffers(stream);
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return 0;
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}
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