From ddd86436f4e3643c04b797f858dab95d5f2e4de9 Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 15:00:15 +0000
Subject: fish

---
 drivers/media/usb/dvb-usb-v2/usb_urb.c | 362 +++++++++++++++++++++++++++++++++
 1 file changed, 362 insertions(+)
 create mode 100644 drivers/media/usb/dvb-usb-v2/usb_urb.c

(limited to 'drivers/media/usb/dvb-usb-v2/usb_urb.c')

diff --git a/drivers/media/usb/dvb-usb-v2/usb_urb.c b/drivers/media/usb/dvb-usb-v2/usb_urb.c
new file mode 100644
index 0000000..ca8f3c2
--- /dev/null
+++ b/drivers/media/usb/dvb-usb-v2/usb_urb.c
@@ -0,0 +1,362 @@
+/* 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 */
+
+int usb_urb_reconfig(struct usb_data_stream *stream,
+		struct usb_data_stream_properties *props);
+
+static void usb_urb_complete(struct urb *urb)
+{
+	struct usb_data_stream *stream = urb->context;
+	int ptype = usb_pipetype(urb->pipe);
+	int i;
+	u8 *b;
+
+	dev_dbg_ratelimited(&stream->udev->dev,
+			"%s: %s urb completed status=%d length=%d/%d pack_num=%d errors=%d\n",
+			__func__, 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 */
+		dev_dbg_ratelimited(&stream->udev->dev,
+				"%s: urb completition failed=%d\n",
+				__func__, 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)
+				dev_dbg(&stream->udev->dev,
+						"%s: iso frame descriptor has an error=%d\n",
+						__func__,
+						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;
+		}
+		break;
+	case PIPE_BULK:
+		if (urb->actual_length > 0)
+			stream->complete(stream, b, urb->actual_length);
+		break;
+	default:
+		dev_err(&stream->udev->dev,
+				"%s: unknown endpoint type in completition handler\n",
+				KBUILD_MODNAME);
+		return;
+	}
+	usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+int usb_urb_killv2(struct usb_data_stream *stream)
+{
+	int i;
+	for (i = 0; i < stream->urbs_submitted; i++) {
+		dev_dbg(&stream->udev->dev, "%s: kill urb=%d\n", __func__, i);
+		/* stop the URB */
+		usb_kill_urb(stream->urb_list[i]);
+	}
+	stream->urbs_submitted = 0;
+	return 0;
+}
+
+int usb_urb_submitv2(struct usb_data_stream *stream,
+		struct usb_data_stream_properties *props)
+{
+	int i, ret;
+
+	if (props) {
+		ret = usb_urb_reconfig(stream, props);
+		if (ret < 0)
+			return ret;
+	}
+
+	for (i = 0; i < stream->urbs_initialized; i++) {
+		dev_dbg(&stream->udev->dev, "%s: submit urb=%d\n", __func__, i);
+		ret = usb_submit_urb(stream->urb_list[i], GFP_ATOMIC);
+		if (ret) {
+			dev_err(&stream->udev->dev,
+					"%s: could not submit urb no. %d - get them all back\n",
+					KBUILD_MODNAME, i);
+			usb_urb_killv2(stream);
+			return ret;
+		}
+		stream->urbs_submitted++;
+	}
+	return 0;
+}
+
+static int usb_urb_free_urbs(struct usb_data_stream *stream)
+{
+	int i;
+
+	usb_urb_killv2(stream);
+
+	for (i = stream->urbs_initialized - 1; i >= 0; i--) {
+		if (stream->urb_list[i]) {
+			dev_dbg(&stream->udev->dev, "%s: free urb=%d\n",
+					__func__, i);
+			/* free the URBs */
+			usb_free_urb(stream->urb_list[i]);
+		}
+	}
+	stream->urbs_initialized = 0;
+
+	return 0;
+}
+
+static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)
+{
+	int i, j;
+
+	/* allocate the URBs */
+	for (i = 0; i < stream->props.count; i++) {
+		dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);
+		stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
+		if (!stream->urb_list[i]) {
+			dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);
+			for (j = 0; j < i; j++)
+				usb_free_urb(stream->urb_list[j]);
+			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 = URB_NO_TRANSFER_DMA_MAP;
+		stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
+		stream->urbs_initialized++;
+	}
+	return 0;
+}
+
+static int usb_urb_alloc_isoc_urbs(struct usb_data_stream *stream)
+{
+	int i, j;
+
+	/* allocate the URBs */
+	for (i = 0; i < stream->props.count; i++) {
+		struct urb *urb;
+		int frame_offset = 0;
+		dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);
+		stream->urb_list[i] = usb_alloc_urb(
+				stream->props.u.isoc.framesperurb, GFP_ATOMIC);
+		if (!stream->urb_list[i]) {
+			dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);
+			for (j = 0; j < i; j++)
+				usb_free_urb(stream->urb_list[j]);
+			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->props.u.isoc.framesize *
+				stream->props.u.isoc.framesperurb;
+		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;
+}
+
+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--;
+			dev_dbg(&stream->udev->dev, "%s: free buf=%d\n",
+				__func__, stream->buf_num);
+			usb_free_coherent(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_alloc_stream_buffers(struct usb_data_stream *stream, int num,
+				    unsigned long size)
+{
+	stream->buf_num = 0;
+	stream->buf_size = size;
+
+	dev_dbg(&stream->udev->dev,
+			"%s: all in all I will use %lu bytes for streaming\n",
+			__func__,  num * size);
+
+	for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
+		stream->buf_list[stream->buf_num] = usb_alloc_coherent(
+				stream->udev, size, GFP_ATOMIC,
+				&stream->dma_addr[stream->buf_num]);
+		if (!stream->buf_list[stream->buf_num]) {
+			dev_dbg(&stream->udev->dev, "%s: alloc buf=%d failed\n",
+					__func__, stream->buf_num);
+			usb_free_stream_buffers(stream);
+			return -ENOMEM;
+		}
+
+		dev_dbg(&stream->udev->dev, "%s: alloc buf=%d %p (dma %llu)\n",
+				__func__, stream->buf_num,
+				stream->buf_list[stream->buf_num],
+				(long long)stream->dma_addr[stream->buf_num]);
+		memset(stream->buf_list[stream->buf_num], 0, size);
+		stream->state |= USB_STATE_URB_BUF;
+	}
+
+	return 0;
+}
+
+int usb_urb_reconfig(struct usb_data_stream *stream,
+		struct usb_data_stream_properties *props)
+{
+	int buf_size;
+
+	if (!props)
+		return 0;
+
+	/* check allocated buffers are large enough for the request */
+	if (props->type == USB_BULK) {
+		buf_size = stream->props.u.bulk.buffersize;
+	} else if (props->type == USB_ISOC) {
+		buf_size = props->u.isoc.framesize * props->u.isoc.framesperurb;
+	} else {
+		dev_err(&stream->udev->dev, "%s: invalid endpoint type=%d\n",
+				KBUILD_MODNAME, props->type);
+		return -EINVAL;
+	}
+
+	if (stream->buf_num < props->count || stream->buf_size < buf_size) {
+		dev_err(&stream->udev->dev,
+				"%s: cannot reconfigure as allocated buffers are too small\n",
+				KBUILD_MODNAME);
+		return -EINVAL;
+	}
+
+	/* check if all fields are same */
+	if (stream->props.type == props->type &&
+			stream->props.count == props->count &&
+			stream->props.endpoint == props->endpoint) {
+		if (props->type == USB_BULK &&
+				props->u.bulk.buffersize ==
+				stream->props.u.bulk.buffersize)
+			return 0;
+		else if (props->type == USB_ISOC &&
+				props->u.isoc.framesperurb ==
+				stream->props.u.isoc.framesperurb &&
+				props->u.isoc.framesize ==
+				stream->props.u.isoc.framesize &&
+				props->u.isoc.interval ==
+				stream->props.u.isoc.interval)
+			return 0;
+	}
+
+	dev_dbg(&stream->udev->dev, "%s: re-alloc urbs\n", __func__);
+
+	usb_urb_free_urbs(stream);
+	memcpy(&stream->props, props, sizeof(*props));
+	if (props->type == USB_BULK)
+		return usb_urb_alloc_bulk_urbs(stream);
+	else if (props->type == USB_ISOC)
+		return usb_urb_alloc_isoc_urbs(stream);
+
+	return 0;
+}
+
+int usb_urb_initv2(struct usb_data_stream *stream,
+		const struct usb_data_stream_properties *props)
+{
+	int ret;
+
+	if (!stream || !props)
+		return -EINVAL;
+
+	memcpy(&stream->props, props, sizeof(*props));
+
+	if (!stream->complete) {
+		dev_err(&stream->udev->dev,
+				"%s: there is no data callback - this doesn't make sense\n",
+				KBUILD_MODNAME);
+		return -EINVAL;
+	}
+
+	switch (stream->props.type) {
+	case USB_BULK:
+		ret = usb_alloc_stream_buffers(stream, stream->props.count,
+				stream->props.u.bulk.buffersize);
+		if (ret < 0)
+			return ret;
+
+		return usb_urb_alloc_bulk_urbs(stream);
+	case USB_ISOC:
+		ret = usb_alloc_stream_buffers(stream, stream->props.count,
+				stream->props.u.isoc.framesize *
+				stream->props.u.isoc.framesperurb);
+		if (ret < 0)
+			return ret;
+
+		return usb_urb_alloc_isoc_urbs(stream);
+	default:
+		dev_err(&stream->udev->dev,
+				"%s: unknown urb-type for data transfer\n",
+				KBUILD_MODNAME);
+		return -EINVAL;
+	}
+}
+
+int usb_urb_exitv2(struct usb_data_stream *stream)
+{
+	usb_urb_free_urbs(stream);
+	usb_free_stream_buffers(stream);
+
+	return 0;
+}
-- 
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