[PATCH] dvb: Add generalized dvb-usb driver

Add generalized dvb-usb driver which supports a wide variety of devices.

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 211 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 000000000000..83d476fb410a
--- /dev/null
+++ b/drivers/media/dvb/dvb-usb/dvb-usb-urb.c
@@ -0,0 +1,211 @@
+/* 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;
+
+	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,
+			2*HZ);
+
+	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,
+				2*HZ);
+
+		if (ret)
+			err("recv bulk message failed: %d",ret);
+		else
+			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);
+
+static void dvb_usb_bulk_urb_complete(struct urb *urb, struct pt_regs *ptregs)
+{
+	struct dvb_usb_device *d = urb->context;
+
+	deb_ts("bulk urb completed. feedcount: %d, status: %d, length: %d\n",d->feedcount,urb->status,
+			urb->actual_length);
+
+	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 && urb->actual_length > 0) {
+		if (d->state & DVB_USB_STATE_DVB)
+			dvb_dmx_swfilter(&d->demux, (u8*) urb->transfer_buffer,urb->actual_length);
+	} else
+		deb_ts("URB dropped because of feedcount.\n");
+
+	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_info("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_info("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\n",i);
+			dvb_usb_urb_kill(d);
+			return ret;
+		}
+		d->urbs_submitted++;
+	}
+	return 0;
+}
+
+static int dvb_usb_bulk_urb_init(struct dvb_usb_device *d)
+{
+	int i,bufsize = d->props.urb.count * d->props.urb.u.bulk.buffersize;
+
+	deb_info("allocate %d bytes as buffersize for all URBs\n",bufsize);
+	/* allocate the actual buffer for the URBs */
+	if ((d->buffer =  usb_buffer_alloc(d->udev, bufsize, SLAB_ATOMIC, &d->dma_handle)) == NULL) {
+		deb_info("not enough memory for urb-buffer allocation.\n");
+		return -ENOMEM;
+	}
+	deb_info("allocation successful\n");
+	memset(d->buffer,0,bufsize);
+
+	d->state |= DVB_USB_STATE_URB_BUF;
+
+	/* allocate the URBs */
+	for (i = 0; i < d->props.urb.count; i++) {
+		if (!(d->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC))) {
+			return -ENOMEM;
+		}
+
+		usb_fill_bulk_urb( d->urb_list[i], d->udev,
+				usb_rcvbulkpipe(d->udev,d->props.urb.endpoint),
+				&d->buffer[i*d->props.urb.u.bulk.buffersize],
+				d->props.urb.u.bulk.buffersize,
+				dvb_usb_bulk_urb_complete, d);
+
+		d->urb_list[i]->transfer_flags = 0;
+		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:
+			err("isochronous transfer not yet implemented in dvb-usb.");
+			return -EINVAL;
+		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_info("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;
+	}
+
+	if (d->state & DVB_USB_STATE_URB_BUF)
+		usb_buffer_free(d->udev, d->props.urb.u.bulk.buffersize * d->props.urb.count,
+				d->buffer, d->dma_handle);
+
+	d->state &= ~DVB_USB_STATE_URB_BUF;
+	return 0;
+}