patch-2.2.18 linux/drivers/usb/dabusb.c

Next file: linux/drivers/usb/dabusb.h
Previous file: linux/drivers/usb/dabfirmware.h
Back to the patch index
Back to the overall index

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/usb/dabusb.c linux/drivers/usb/dabusb.c
@@ -0,0 +1,847 @@
+/*****************************************************************************/
+
+/*
+ *      dabusb.c  --  dab usb driver.
+ *
+ *      Copyright (C) 1999  Deti Fliegl (deti@fliegl.de)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with this program; if not, write to the Free Software
+ *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *
+ *  $Id: dabusb.c,v 1.54 2000/07/24 21:39:39 deti Exp $
+ *
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/miscdevice.h>
+#include <linux/list.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/atomic.h>
+#include <linux/delay.h>
+#include <linux/usb.h>
+#include <linux/smp_lock.h>
+
+#include "dabusb.h"
+#include "dabfirmware.h"
+
+/* --------------------------------------------------------------------- */
+
+#define NRDABUSB 4
+
+/*-------------------------------------------------------------------*/
+
+static dabusb_t dabusb[NRDABUSB];
+static int buffers = 256;
+
+/*-------------------------------------------------------------------*/
+
+static int dabusb_add_buf_tail (pdabusb_t s, struct list_head *dst, struct list_head *src)
+{
+	unsigned long flags;
+	struct list_head *tmp;
+	int ret = 0;
+
+	spin_lock_irqsave (&s->lock, flags);
+
+	if (list_empty (src)) {
+		// no elements in source buffer
+		ret = -1;
+		goto err;
+	}
+	tmp = src->next;
+	list_del (tmp);
+	list_add_tail (tmp, dst);
+
+  err:	spin_unlock_irqrestore (&s->lock, flags);
+	return ret;
+}
+/*-------------------------------------------------------------------*/
+#ifdef DEBUG 
+static void dump_urb (purb_t purb)
+{
+	dbg("urb                   :%p", purb);
+	dbg("next                  :%p", purb->next);
+	dbg("dev                   :%p", purb->dev);
+	dbg("pipe                  :%08X", purb->pipe);
+	dbg("status                :%d", purb->status);
+	dbg("transfer_flags        :%08X", purb->transfer_flags);
+	dbg("transfer_buffer       :%p", purb->transfer_buffer);
+	dbg("transfer_buffer_length:%d", purb->transfer_buffer_length);
+	dbg("actual_length         :%d", purb->actual_length);
+	dbg("setup_packet          :%p", purb->setup_packet);
+	dbg("start_frame           :%d", purb->start_frame);
+	dbg("number_of_packets     :%d", purb->number_of_packets);
+	dbg("interval              :%d", purb->interval);
+	dbg("error_count           :%d", purb->error_count);
+	dbg("context               :%p", purb->context);
+	dbg("complete              :%p", purb->complete);
+}
+#endif
+/*-------------------------------------------------------------------*/
+static int dabusb_cancel_queue (pdabusb_t s, struct list_head *q)
+{
+	unsigned long flags;
+	struct list_head *p;
+	pbuff_t b;
+
+	dbg("dabusb_cancel_queue");
+
+	spin_lock_irqsave (&s->lock, flags);
+
+	for (p = q->next; p != q; p = p->next) {
+		b = list_entry (p, buff_t, buff_list);
+
+#ifdef DEBUG
+		dump_urb(b->purb);
+#endif
+		usb_unlink_urb (b->purb);
+	}
+	spin_unlock_irqrestore (&s->lock, flags);
+	return 0;
+}
+/*-------------------------------------------------------------------*/
+static int dabusb_free_queue (struct list_head *q)
+{
+	struct list_head *tmp;
+	struct list_head *p;
+	pbuff_t b;
+
+	dbg("dabusb_free_queue");
+	for (p = q->next; p != q;) {
+		b = list_entry (p, buff_t, buff_list);
+
+#ifdef DEBUG 
+		dump_urb(b->purb);
+#endif
+		if (b->purb->transfer_buffer)
+			kfree (b->purb->transfer_buffer);
+		usb_free_urb(b->purb);
+		tmp = p->next;
+		list_del (p);
+		kfree (b);
+		p = tmp;
+	}
+
+	return 0;
+}
+/*-------------------------------------------------------------------*/
+static int dabusb_free_buffers (pdabusb_t s)
+{
+	unsigned long flags;
+	dbg("dabusb_free_buffers");
+
+	spin_lock_irqsave(&s->lock, flags);
+
+	dabusb_free_queue (&s->free_buff_list);
+	dabusb_free_queue (&s->rec_buff_list);
+
+	spin_unlock_irqrestore(&s->lock, flags);
+
+	s->got_mem = 0;
+	return 0;
+}
+/*-------------------------------------------------------------------*/
+static void dabusb_iso_complete (purb_t purb)
+{
+	pbuff_t b = purb->context;
+	pdabusb_t s = b->s;
+	int i;
+	int len;
+	int dst = 0;
+	void *buf = purb->transfer_buffer;
+
+	dbg("dabusb_iso_complete");
+
+	// process if URB was not killed
+	if (purb->status != -ENOENT) {
+		unsigned int pipe = usb_rcvisocpipe (purb->dev, _DABUSB_ISOPIPE);
+		int pipesize = usb_maxpacket (purb->dev, pipe, usb_pipeout (pipe));
+		for (i = 0; i < purb->number_of_packets; i++)
+			if (!purb->iso_frame_desc[i].status) {
+				len = purb->iso_frame_desc[i].actual_length;
+				if (len <= pipesize) {
+					memcpy (buf + dst, buf + purb->iso_frame_desc[i].offset, len);
+					dst += len;
+				}
+				else
+					err("dabusb_iso_complete: invalid len %d", len);
+			}
+			else
+				warn("dabusb_iso_complete: corrupted packet status: %d", purb->iso_frame_desc[i].status);
+		if (dst != purb->actual_length)
+			err("dst!=purb->actual_length:%d!=%d", dst, purb->actual_length);
+	}
+
+	if (atomic_dec_and_test (&s->pending_io) && !s->remove_pending && s->state != _stopped) {
+		s->overruns++;
+		err("overrun (%d)", s->overruns);
+	}
+	wake_up (&s->wait);
+}
+/*-------------------------------------------------------------------*/
+static int dabusb_alloc_buffers (pdabusb_t s)
+{
+	int buffers = 0;
+	pbuff_t b;
+	unsigned int pipe = usb_rcvisocpipe (s->usbdev, _DABUSB_ISOPIPE);
+	int pipesize = usb_maxpacket (s->usbdev, pipe, usb_pipeout (pipe));
+	int packets = _ISOPIPESIZE / pipesize;
+	int transfer_buffer_length = packets * pipesize;
+	int i;
+
+	dbg("dabusb_alloc_buffers pipesize:%d packets:%d transfer_buffer_len:%d",
+		 pipesize, packets, transfer_buffer_length);
+
+	while (buffers < (s->total_buffer_size << 10)) {
+		b = (pbuff_t) kmalloc (sizeof (buff_t), GFP_KERNEL);
+		if (!b) {
+			err("kmalloc(sizeof(buff_t))==NULL");
+			goto err;
+		}
+		memset (b, sizeof (buff_t), 0);
+		b->s = s;
+		b->purb = usb_alloc_urb(packets);
+		if (!b->purb) {
+			err("usb_alloc_urb == NULL");
+			kfree (b);
+			goto err;
+		}
+
+		b->purb->transfer_buffer = kmalloc (transfer_buffer_length, GFP_KERNEL);
+		if (!b->purb->transfer_buffer) {
+			kfree (b->purb);
+			kfree (b);
+			err("kmalloc(%d)==NULL", transfer_buffer_length);
+			goto err;
+		}
+
+		b->purb->transfer_buffer_length = transfer_buffer_length;
+		b->purb->number_of_packets = packets;
+		b->purb->complete = dabusb_iso_complete;
+		b->purb->context = b;
+		b->purb->dev = s->usbdev;
+		b->purb->pipe = pipe;
+		b->purb->transfer_flags = USB_ISO_ASAP;
+
+		for (i = 0; i < packets; i++) {
+			b->purb->iso_frame_desc[i].offset = i * pipesize;
+			b->purb->iso_frame_desc[i].length = pipesize;
+		}
+
+		buffers += transfer_buffer_length;
+		list_add_tail (&b->buff_list, &s->free_buff_list);
+	}
+	s->got_mem = buffers;
+
+	return 0;
+
+	err:
+	dabusb_free_buffers (s);
+	return -ENOMEM;
+}
+/*-------------------------------------------------------------------*/
+static int dabusb_bulk (pdabusb_t s, pbulk_transfer_t pb)
+{
+	int ret;
+	unsigned int pipe;
+	int actual_length;
+
+	dbg("dabusb_bulk");
+
+	if (!pb->pipe)
+		pipe = usb_rcvbulkpipe (s->usbdev, 2);
+	else
+		pipe = usb_sndbulkpipe (s->usbdev, 2);
+
+	ret=usb_bulk_msg(s->usbdev, pipe, pb->data, pb->size, &actual_length, 100);
+	if(ret<0) {
+		err("dabusb: usb_bulk_msg failed(%d)",ret);
+
+		if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
+			err("set_interface failed");
+			return -EINVAL;
+		}
+
+	}
+	
+	if( ret == -EPIPE ) {
+		warn("CLEAR_FEATURE request to remove STALL condition.");
+		if(usb_clear_halt(s->usbdev, usb_pipeendpoint(pipe)))
+			err("request failed");
+	}
+
+	pb->size = actual_length;
+	return ret;
+}
+/* --------------------------------------------------------------------- */
+static int dabusb_writemem (pdabusb_t s, int pos, unsigned char *data, int len)
+{
+	int ret;
+	unsigned char *transfer_buffer =  kmalloc (len, GFP_KERNEL);
+
+	if (!transfer_buffer) {
+		err("dabusb_writemem: kmalloc(%d) failed.", len);
+		return -ENOMEM;
+	}
+
+	memcpy (transfer_buffer, data, len);
+
+	ret=usb_control_msg(s->usbdev, usb_sndctrlpipe( s->usbdev, 0 ), 0xa0, 0x40, pos, 0, transfer_buffer, len, 300);
+
+	kfree (transfer_buffer);
+	return ret;
+}
+/* --------------------------------------------------------------------- */
+static int dabusb_8051_reset (pdabusb_t s, unsigned char reset_bit)
+{
+	dbg("dabusb_8051_reset: %d",reset_bit);
+	return dabusb_writemem (s, CPUCS_REG, &reset_bit, 1);
+}
+/* --------------------------------------------------------------------- */
+static int dabusb_loadmem (pdabusb_t s, const char *fname)
+{
+	int ret;
+	PINTEL_HEX_RECORD ptr = firmware;
+
+	dbg("Enter dabusb_loadmem (internal)");
+	
+	ret = dabusb_8051_reset (s, 1);
+	while (ptr->Type == 0) {
+
+		dbg("dabusb_writemem: %04X %p %d)", ptr->Address, ptr->Data, ptr->Length);
+
+		ret = dabusb_writemem (s, ptr->Address, ptr->Data, ptr->Length);
+		if (ret < 0) {
+			err("dabusb_writemem failed (%d %04X %p %d)", ret, ptr->Address, ptr->Data, ptr->Length);
+			break;
+		}
+		ptr++;
+	}
+	ret = dabusb_8051_reset (s, 0);
+
+	dbg("dabusb_loadmem: exit");
+
+	return ret;
+}
+/* --------------------------------------------------------------------- */
+static int dabusb_fpga_clear (pdabusb_t s, pbulk_transfer_t b)
+{
+	b->size = 4;
+	b->data[0] = 0x2a;
+	b->data[1] = 0;
+	b->data[2] = 0;
+	b->data[3] = 0;
+
+	dbg("dabusb_fpga_clear");
+
+	return dabusb_bulk (s, b);
+}
+/* --------------------------------------------------------------------- */
+static int dabusb_fpga_init (pdabusb_t s, pbulk_transfer_t b)
+{
+	b->size = 4;
+	b->data[0] = 0x2c;
+	b->data[1] = 0;
+	b->data[2] = 0;
+	b->data[3] = 0;
+
+	dbg("dabusb_fpga_init");
+
+	return dabusb_bulk (s, b);
+}
+/* --------------------------------------------------------------------- */
+static int dabusb_fpga_download (pdabusb_t s, const char *fname)
+{
+	pbulk_transfer_t b = kmalloc (sizeof (bulk_transfer_t), GFP_KERNEL);
+	unsigned int blen, n;
+	int ret;
+	unsigned char *buf = bitstream;
+
+	dbg("Enter dabusb_fpga_download (internal)");
+
+	if (!b) {
+		err("kmalloc(sizeof(bulk_transfer_t))==NULL");
+		return -ENOMEM;
+	}
+
+	b->pipe = 1;
+	ret = dabusb_fpga_clear (s, b);
+	mdelay (10);
+	blen = buf[73] + (buf[72] << 8);
+
+	dbg("Bitstream len: %i", blen);
+
+	b->data[0] = 0x2b;
+	b->data[1] = 0;
+	b->data[2] = 0;
+	b->data[3] = 60;
+
+	for (n = 0; n <= blen + 60; n += 60) {
+		// some cclks for startup
+		b->size = 64;
+		memcpy (b->data + 4, buf + 74 + n, 60);
+		ret = dabusb_bulk (s, b);
+		if (ret < 0) {
+			err("dabusb_bulk failed.");
+			break;
+		}
+		mdelay (1);
+	}
+
+	ret = dabusb_fpga_init (s, b);
+	kfree (b);
+
+	dbg("exit dabusb_fpga_download");
+
+	return ret;
+}
+
+static loff_t dabusb_llseek (struct file *file, loff_t offset, int origin)
+{
+	return -ESPIPE;
+}
+
+static int dabusb_stop (pdabusb_t s)
+{
+	dbg("dabusb_stop");
+
+	s->state = _stopped;
+	dabusb_cancel_queue (s, &s->rec_buff_list);
+
+	dbg("pending_io: %d", s->pending_io.counter);
+
+	s->pending_io.counter = 0;
+	return 0;
+}
+
+static int dabusb_startrek (pdabusb_t s)
+{
+	if (!s->got_mem && s->state != _started) {
+
+		dbg("dabusb_startrek");
+
+		if (dabusb_alloc_buffers (s) < 0)
+			return -ENOMEM;
+		dabusb_stop (s);
+		s->state = _started;
+		s->readptr = 0;
+	}
+
+	if (!list_empty (&s->free_buff_list)) {
+		pbuff_t end;
+		int ret;
+		
+	while (!dabusb_add_buf_tail (s, &s->rec_buff_list, &s->free_buff_list)) {
+
+			dbg("submitting: end:%p s->rec_buff_list:%p", s->rec_buff_list.prev, &s->rec_buff_list);
+
+			end = list_entry (s->rec_buff_list.prev, buff_t, buff_list);
+
+			ret = usb_submit_urb (end->purb);
+			if (ret) {
+				err("usb_submit_urb returned:%d", ret);
+				if (dabusb_add_buf_tail (s, &s->free_buff_list, &s->rec_buff_list))
+					err("startrek: dabusb_add_buf_tail failed");
+				break;
+			}
+			else
+				atomic_inc (&s->pending_io);
+		}
+		dbg("pending_io: %d",s->pending_io.counter);
+	}
+
+	return 0;
+}
+
+static ssize_t dabusb_read (struct file *file, char *buf, size_t count, loff_t * ppos)
+{
+	pdabusb_t s = (pdabusb_t) file->private_data;
+	unsigned long flags;
+	unsigned ret = 0;
+	int rem;
+	int cnt;
+	pbuff_t b;
+	purb_t purb = NULL;
+
+	dbg("dabusb_read");
+
+	if (*ppos)
+		return -ESPIPE;
+
+	if (s->remove_pending)
+		return -EIO;
+
+
+	if (!s->usbdev)
+		return -EIO;
+
+	while (count > 0) {
+		dabusb_startrek (s);
+
+		spin_lock_irqsave (&s->lock, flags);
+
+		if (list_empty (&s->rec_buff_list)) {
+
+			spin_unlock_irqrestore(&s->lock, flags);
+
+			err("error: rec_buf_list is empty");
+			goto err;
+		}
+		
+		b = list_entry (s->rec_buff_list.next, buff_t, buff_list);
+		purb = b->purb;
+
+		spin_unlock_irqrestore(&s->lock, flags);
+
+		if (purb->status == -EINPROGRESS) {
+			if (file->f_flags & O_NONBLOCK)		// return nonblocking
+			 {
+				if (!ret)
+					ret = -EAGAIN;
+				goto err;
+			}
+
+			interruptible_sleep_on (&s->wait);
+
+			if (signal_pending (current)) {
+				if (!ret)
+					ret = -ERESTARTSYS;
+				goto err;
+			}
+
+			spin_lock_irqsave (&s->lock, flags);
+
+			if (list_empty (&s->rec_buff_list)) {
+				spin_unlock_irqrestore(&s->lock, flags);
+				err("error: still no buffer available.");
+				goto err;
+			}
+			spin_unlock_irqrestore(&s->lock, flags);
+			s->readptr = 0;
+		}
+		if (s->remove_pending) {
+			ret = -EIO;
+			goto err;
+		}
+
+		rem = purb->actual_length - s->readptr;		// set remaining bytes to copy
+
+		if (count >= rem)
+			cnt = rem;
+		else
+			cnt = count;
+
+		dbg("copy_to_user:%p %p %d",buf, purb->transfer_buffer + s->readptr, cnt);
+
+		if (copy_to_user (buf, purb->transfer_buffer + s->readptr, cnt)) {
+			err("read: copy_to_user failed");
+			if (!ret)
+				ret = -EFAULT;
+			goto err;
+		}
+
+		s->readptr += cnt;
+		count -= cnt;
+		buf += cnt;
+		ret += cnt;
+
+		if (s->readptr == purb->actual_length) {
+			// finished, take next buffer
+			if (dabusb_add_buf_tail (s, &s->free_buff_list, &s->rec_buff_list))
+				err("read: dabusb_add_buf_tail failed");
+			s->readptr = 0;
+		}
+	}
+      err:			//up(&s->mutex);
+	return ret;
+}
+
+static int dabusb_open (struct inode *inode, struct file *file)
+{
+	int devnum = MINOR (inode->i_rdev);
+	pdabusb_t s;
+
+	if (devnum < DABUSB_MINOR || devnum >= (DABUSB_MINOR + NRDABUSB))
+		return -EIO;
+
+	s = &dabusb[devnum - DABUSB_MINOR];
+
+	dbg("dabusb_open");
+	down (&s->mutex);
+
+	while (!s->usbdev || s->opened) {
+		up (&s->mutex);
+
+		if (file->f_flags & O_NONBLOCK) {
+			return -EBUSY;
+		}
+		schedule_timeout (HZ / 2);
+
+		if (signal_pending (current)) {
+			return -EAGAIN;
+		}
+		down (&s->mutex);
+	}
+	if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
+		err("set_interface failed");
+		return -EINVAL;
+	}
+	s->opened = 1;
+	up (&s->mutex);
+
+	file->f_pos = 0;
+	file->private_data = s;
+
+	return 0;
+}
+
+static int dabusb_release (struct inode *inode, struct file *file)
+{
+	pdabusb_t s = (pdabusb_t) file->private_data;
+
+	dbg("dabusb_release");
+
+	lock_kernel();
+	down (&s->mutex);
+	dabusb_stop (s);
+	dabusb_free_buffers (s);
+	up (&s->mutex);
+
+	if (!s->remove_pending) {
+		if (usb_set_interface (s->usbdev, _DABUSB_IF, 0) < 0)
+			err("set_interface failed");
+	}
+	else
+		wake_up (&s->remove_ok);
+
+	s->opened = 0;
+	unlock_kernel();
+	return 0;
+}
+
+static int dabusb_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	pdabusb_t s = (pdabusb_t) file->private_data;
+	pbulk_transfer_t pbulk;
+	int ret = 0;
+	int version = DABUSB_VERSION;
+
+	dbg("dabusb_ioctl");
+
+	if (s->remove_pending)
+		return -EIO;
+
+	down (&s->mutex);
+
+	if (!s->usbdev) {
+		up (&s->mutex);
+		return -EIO;
+	}
+
+	switch (cmd) {
+
+	case IOCTL_DAB_BULK:
+		pbulk = (pbulk_transfer_t) kmalloc (sizeof (bulk_transfer_t), GFP_KERNEL);
+
+		if (!pbulk) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		if (copy_from_user (pbulk, (void *) arg, sizeof (bulk_transfer_t))) {
+			ret = -EFAULT;
+			kfree (pbulk);
+			break;
+		}
+
+		ret=dabusb_bulk (s, pbulk);
+		if(ret==0)
+			ret = copy_to_user ((void *) arg, pbulk, sizeof (bulk_transfer_t));
+		kfree (pbulk);
+		break;
+
+	case IOCTL_DAB_OVERRUNS:
+		ret = put_user (s->overruns, (unsigned int *) arg);
+		break;
+
+	case IOCTL_DAB_VERSION:
+		ret = put_user (version, (unsigned int *) arg);
+		break;
+
+	default:
+		ret = -ENOIOCTLCMD;
+		break;
+	}
+	up (&s->mutex);
+	return ret;
+}
+
+static struct file_operations dabusb_fops =
+{
+	llseek:		dabusb_llseek,
+	read:		dabusb_read,
+	ioctl:		dabusb_ioctl,
+	open:		dabusb_open,
+	release:	dabusb_release,
+};
+
+static int dabusb_find_struct (void)
+{
+	int u;
+
+	for (u = 0; u < NRDABUSB; u++) {
+		pdabusb_t s = &dabusb[u];
+		if (!s->usbdev)
+			return u;
+	}
+	return -1;
+}
+
+/* --------------------------------------------------------------------- */
+static void *dabusb_probe (struct usb_device *usbdev, unsigned int ifnum)
+{
+	int devnum;
+	pdabusb_t s;
+
+	dbg("dabusb: probe: vendor id 0x%x, device id 0x%x ifnum:%d",
+	  usbdev->descriptor.idVendor, usbdev->descriptor.idProduct, ifnum);
+
+	/* the 1234:5678 is just a self assigned test ID */
+	if ((usbdev->descriptor.idVendor != 0x0547 || usbdev->descriptor.idProduct != 0x2131) &&
+	    (usbdev->descriptor.idVendor != 0x0547 || usbdev->descriptor.idProduct != 0x9999))
+		return NULL;
+
+	/* We don't handle multiple configurations */
+	if (usbdev->descriptor.bNumConfigurations != 1)
+		return NULL;
+
+	if (ifnum != _DABUSB_IF && usbdev->descriptor.idProduct == 0x9999)
+		return NULL;
+
+	devnum = dabusb_find_struct ();
+	if (devnum == -1)
+		return NULL;
+
+	s = &dabusb[devnum];
+
+	down (&s->mutex);
+	s->remove_pending = 0;
+	s->usbdev = usbdev;
+
+	if (usb_set_configuration (usbdev, usbdev->config[0].bConfigurationValue) < 0) {
+		err("set_configuration failed");
+		goto reject;
+	}
+	if (usbdev->descriptor.idProduct == 0x2131) {
+		dabusb_loadmem (s, NULL);
+		goto reject;
+	}
+	else {
+		dabusb_fpga_download (s, NULL);
+
+		if (usb_set_interface (s->usbdev, _DABUSB_IF, 0) < 0) {
+			err("set_interface failed");
+			goto reject;
+		}
+	}
+	dbg("bound to interface: %d", ifnum);
+	up (&s->mutex);
+	MOD_INC_USE_COUNT;
+	return s;
+
+      reject:
+	up (&s->mutex);
+	s->usbdev = NULL;
+	return NULL;
+}
+
+static void dabusb_disconnect (struct usb_device *usbdev, void *ptr)
+{
+	pdabusb_t s = (pdabusb_t) ptr;
+
+	dbg("dabusb_disconnect");
+
+	s->remove_pending = 1;
+	wake_up (&s->wait);
+	if (s->state == _started)
+		sleep_on (&s->remove_ok);
+	s->usbdev = NULL;
+	s->overruns = 0;
+	MOD_DEC_USE_COUNT;
+}
+
+static struct usb_driver dabusb_driver =
+{
+	"dabusb",
+	dabusb_probe,
+	dabusb_disconnect,
+	{NULL, NULL},
+	&dabusb_fops,
+	DABUSB_MINOR
+};
+
+/* --------------------------------------------------------------------- */
+
+static int __init dabusb_init (void)
+{
+	unsigned u;
+
+	/* initialize struct */
+	for (u = 0; u < NRDABUSB; u++) {
+		pdabusb_t s = &dabusb[u];
+		memset (s, 0, sizeof (dabusb_t));
+		init_MUTEX (&s->mutex);
+		s->usbdev = NULL;
+		s->total_buffer_size = buffers;
+		init_waitqueue_head (&s->wait);
+		init_waitqueue_head (&s->remove_ok);
+		spin_lock_init (&s->lock);
+		INIT_LIST_HEAD (&s->free_buff_list);
+		INIT_LIST_HEAD (&s->rec_buff_list);
+	}
+
+	/* register misc device */
+	if (usb_register(&dabusb_driver))
+		return -1;
+
+	dbg("dabusb_init: driver registered");
+	return 0;
+}
+
+static void __exit dabusb_cleanup (void)
+{
+	dbg("dabusb_cleanup");
+
+	usb_deregister (&dabusb_driver);
+}
+
+/* --------------------------------------------------------------------- */
+
+MODULE_AUTHOR ("Deti Fliegl, deti@fliegl.de");
+MODULE_DESCRIPTION ("DAB-USB Interface Driver for Linux (c)1999");
+MODULE_PARM (buffers, "i");
+MODULE_PARM_DESC (buffers, "Number of buffers (default=256)");
+
+module_init (dabusb_init);
+module_exit (dabusb_cleanup);
+
+/* --------------------------------------------------------------------- */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)