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353 lines
9.0 KiB
353 lines
9.0 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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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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