1 files changed, 325 insertions, 0 deletions

diff --git a/drivers/media/dvb/dvb-usb/dvb-usb-urb.c b/drivers/media/dvb/dvb-usb/dvb-usb-urb.c
new file mode 100644
index 0000000..f5799a4
--- /dev/null
+++ b/drivers/media/dvb/dvb-usb/dvb-usb-urb.c
@@ -0,0 +1,325 @@
+/* dvb-usb-urb.c is part of the DVB USB library.
+ *
+ * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de)
+ * see dvb-usb-init.c for copyright information.
+ *
+ * This file contains functions for initializing and handling the
+ * USB and URB stuff.
+ */
+#include "dvb-usb-common.h"
+
+int dvb_usb_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
+	u16 rlen, int delay_ms)
+{
+	int actlen,ret = -ENOMEM;
+
+	if (d->props.generic_bulk_ctrl_endpoint == 0) {
+		err("endpoint for generic control not specified.");
+		return -EINVAL;
+	}
+
+	if (wbuf == NULL || wlen == 0)
+		return -EINVAL;
+
+	if ((ret = down_interruptible(&d->usb_sem)))
+		return ret;
+
+	deb_xfer(">>> ");
+	debug_dump(wbuf,wlen,deb_xfer);
+
+	ret = usb_bulk_msg(d->udev,usb_sndbulkpipe(d->udev,
+			d->props.generic_bulk_ctrl_endpoint), wbuf,wlen,&actlen,
+			2000);
+
+	if (ret)
+		err("bulk message failed: %d (%d/%d)",ret,wlen,actlen);
+	else
+		ret = actlen != wlen ? -1 : 0;
+
+	/* an answer is expected, and no error before */
+	if (!ret && rbuf && rlen) {
+		if (delay_ms)
+			msleep(delay_ms);
+
+		ret = usb_bulk_msg(d->udev,usb_rcvbulkpipe(d->udev,
+				d->props.generic_bulk_ctrl_endpoint),rbuf,rlen,&actlen,
+				2000);
+
+		if (ret)
+			err("recv bulk message failed: %d",ret);
+		else {
+			deb_xfer("<<< ");
+			debug_dump(rbuf,actlen,deb_xfer);
+		}
+	}
+
+	up(&d->usb_sem);
+	return ret;
+}
+EXPORT_SYMBOL(dvb_usb_generic_rw);
+
+int dvb_usb_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
+{
+	return dvb_usb_generic_rw(d,buf,len,NULL,0,0);
+}
+EXPORT_SYMBOL(dvb_usb_generic_write);
+
+
+/* URB stuff for streaming */
+static void dvb_usb_urb_complete(struct urb *urb, struct pt_regs *ptregs)
+{
+	struct dvb_usb_device *d = urb->context;
+	int ptype = usb_pipetype(urb->pipe);
+	int i;
+	u8 *b;
+
+	deb_ts("'%s' urb completed. feedcount: %d, status: %d, length: %d/%d, pack_num: %d, errors: %d\n",
+			ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk", d->feedcount,
+			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.", urb->status);
+			break;
+	}
+
+	if (d->feedcount > 0) {
+		if (d->state & DVB_USB_STATE_DVB) {
+			switch (ptype) {
+				case PIPE_ISOCHRONOUS:
+					b = (u8 *) urb->transfer_buffer;
+					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) {
+								dvb_dmx_swfilter(&d->demux,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_ts);
+					break;
+				case PIPE_BULK:
+					if (urb->actual_length > 0)
+						dvb_dmx_swfilter(&d->demux, (u8 *) urb->transfer_buffer,urb->actual_length);
+					break;
+				default:
+					err("unkown endpoint type in completition handler.");
+					return;
+			}
+		}
+	}
+
+	usb_submit_urb(urb,GFP_ATOMIC);
+}
+
+int dvb_usb_urb_kill(struct dvb_usb_device *d)
+{
+	int i;
+	for (i = 0; i < d->urbs_submitted; i++) {
+		deb_ts("killing URB no. %d.\n",i);
+
+		/* stop the URB */
+		usb_kill_urb(d->urb_list[i]);
+	}
+	d->urbs_submitted = 0;
+	return 0;
+}
+
+int dvb_usb_urb_submit(struct dvb_usb_device *d)
+{
+	int i,ret;
+	for (i = 0; i < d->urbs_initialized; i++) {
+		deb_ts("submitting URB no. %d\n",i);
+		if ((ret = usb_submit_urb(d->urb_list[i],GFP_ATOMIC))) {
+			err("could not submit URB no. %d - get them all back",i);
+			dvb_usb_urb_kill(d);
+			return ret;
+		}
+		d->urbs_submitted++;
+	}
+	return 0;
+}
+
+static int dvb_usb_free_stream_buffers(struct dvb_usb_device *d)
+{
+	if (d->state & DVB_USB_STATE_URB_BUF) {
+		while (d->buf_num) {
+			d->buf_num--;
+			deb_mem("freeing buffer %d\n",d->buf_num);
+			usb_buffer_free(d->udev, d->buf_size,
+					d->buf_list[d->buf_num], d->dma_addr[d->buf_num]);
+		}
+		kfree(d->buf_list);
+		kfree(d->dma_addr);
+	}
+
+	d->state &= ~DVB_USB_STATE_URB_BUF;
+
+	return 0;
+}
+
+static int dvb_usb_allocate_stream_buffers(struct dvb_usb_device *d, int num, unsigned long size)
+{
+	d->buf_num = 0;
+	d->buf_size = size;
+
+	deb_mem("all in all I will use %lu bytes for streaming\n",num*size);
+
+	if ((d->buf_list = kmalloc(num*sizeof(u8 *), GFP_ATOMIC)) == NULL)
+		return -ENOMEM;
+
+	if ((d->dma_addr = kmalloc(num*sizeof(dma_addr_t), GFP_ATOMIC)) == NULL) {
+		kfree(d->buf_list);
+		return -ENOMEM;
+	}
+	memset(d->buf_list,0,num*sizeof(u8 *));
+	memset(d->dma_addr,0,num*sizeof(dma_addr_t));
+
+	d->state |= DVB_USB_STATE_URB_BUF;
+
+	for (d->buf_num = 0; d->buf_num < num; d->buf_num++) {
+		deb_mem("allocating buffer %d\n",d->buf_num);
+		if (( d->buf_list[d->buf_num] =
+					usb_buffer_alloc(d->udev, size, SLAB_ATOMIC,
+					&d->dma_addr[d->buf_num]) ) == NULL) {
+			deb_mem("not enough memory for urb-buffer allocation.\n");
+			dvb_usb_free_stream_buffers(d);
+			return -ENOMEM;
+		}
+		deb_mem("buffer %d: %p (dma: %d)\n",d->buf_num,d->buf_list[d->buf_num],d->dma_addr[d->buf_num]);
+		memset(d->buf_list[d->buf_num],0,size);
+	}
+	deb_mem("allocation successful\n");
+
+	return 0;
+}
+
+static int dvb_usb_bulk_urb_init(struct dvb_usb_device *d)
+{
+	int i;
+
+	if ((i = dvb_usb_allocate_stream_buffers(d,d->props.urb.count,
+					d->props.urb.u.bulk.buffersize)) < 0)
+		return i;
+
+	/* allocate the URBs */
+	for (i = 0; i < d->props.urb.count; i++) {
+		if ((d->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC)) == NULL)
+			return -ENOMEM;
+
+		usb_fill_bulk_urb( d->urb_list[i], d->udev,
+				usb_rcvbulkpipe(d->udev,d->props.urb.endpoint),
+				d->buf_list[i],
+				d->props.urb.u.bulk.buffersize,
+				dvb_usb_urb_complete, d);
+
+		d->urb_list[i]->transfer_flags = 0;
+		d->urbs_initialized++;
+	}
+	return 0;
+}
+
+static int dvb_usb_isoc_urb_init(struct dvb_usb_device *d)
+{
+	int i,j;
+
+	if ((i = dvb_usb_allocate_stream_buffers(d,d->props.urb.count,
+					d->props.urb.u.isoc.framesize*d->props.urb.u.isoc.framesperurb)) < 0)
+		return i;
+
+	/* allocate the URBs */
+	for (i = 0; i < d->props.urb.count; i++) {
+		struct urb *urb;
+		int frame_offset = 0;
+		if ((d->urb_list[i] =
+					usb_alloc_urb(d->props.urb.u.isoc.framesperurb,GFP_ATOMIC)) == NULL)
+			return -ENOMEM;
+
+		urb = d->urb_list[i];
+
+		urb->dev = d->udev;
+		urb->context = d;
+		urb->complete = dvb_usb_urb_complete;
+		urb->pipe = usb_rcvisocpipe(d->udev,d->props.urb.endpoint);
+		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
+		urb->interval = d->props.urb.u.isoc.interval;
+		urb->number_of_packets = d->props.urb.u.isoc.framesperurb;
+		urb->transfer_buffer_length = d->buf_size;
+		urb->transfer_buffer = d->buf_list[i];
+		urb->transfer_dma = d->dma_addr[i];
+
+		for (j = 0; j < d->props.urb.u.isoc.framesperurb; j++) {
+			urb->iso_frame_desc[j].offset = frame_offset;
+			urb->iso_frame_desc[j].length = d->props.urb.u.isoc.framesize;
+			frame_offset += d->props.urb.u.isoc.framesize;
+		}
+
+		d->urbs_initialized++;
+	}
+	return 0;
+
+}
+
+int dvb_usb_urb_init(struct dvb_usb_device *d)
+{
+	/*
+	 * when reloading the driver w/o replugging the device
+	 * sometimes a timeout occures, this helps
+	 */
+	if (d->props.generic_bulk_ctrl_endpoint != 0) {
+		usb_clear_halt(d->udev,usb_sndbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint));
+		usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint));
+	}
+	usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.urb.endpoint));
+
+	/* allocate the array for the data transfer URBs */
+	d->urb_list = kmalloc(d->props.urb.count * sizeof(struct urb *),GFP_KERNEL);
+	if (d->urb_list == NULL)
+		return -ENOMEM;
+	memset(d->urb_list,0,d->props.urb.count * sizeof(struct urb *));
+	d->state |= DVB_USB_STATE_URB_LIST;
+
+	switch (d->props.urb.type) {
+		case DVB_USB_BULK:
+			return dvb_usb_bulk_urb_init(d);
+		case DVB_USB_ISOC:
+			return dvb_usb_isoc_urb_init(d);
+		default:
+			err("unkown URB-type for data transfer.");
+			return -EINVAL;
+	}
+}
+
+int dvb_usb_urb_exit(struct dvb_usb_device *d)
+{
+	int i;
+
+	dvb_usb_urb_kill(d);
+
+	if (d->state & DVB_USB_STATE_URB_LIST) {
+		for (i = 0; i < d->urbs_initialized; i++) {
+			if (d->urb_list[i] != NULL) {
+				deb_mem("freeing URB no. %d.\n",i);
+				/* free the URBs */
+				usb_free_urb(d->urb_list[i]);
+			}
+		}
+		d->urbs_initialized = 0;
+		/* free the urb array */
+		kfree(d->urb_list);
+		d->state &= ~DVB_USB_STATE_URB_LIST;
+	}
+
+	dvb_usb_free_stream_buffers(d);
+	return 0;
+}