dabusb.c
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上传日期:2013-04-10
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- /*****************************************************************************/
- /*
- * 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"
- /*
- * Version Information
- */
- #define DRIVER_VERSION "v1.54"
- #define DRIVER_AUTHOR "Deti Fliegl, deti@fliegl.de"
- #define DRIVER_DESC "DAB-USB Interface Driver for Linux (c)1999"
- /* --------------------------------------------------------------------- */
- #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 (struct urb *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 (struct urb *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, 0, sizeof (buff_t));
- 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 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;
- struct urb *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");
- up(&s->mutex);
- 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 =
- {
- owner: THIS_MODULE,
- llseek: no_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,
- const struct usb_device_id *id)
- {
- 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);
- /* 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_device_id dabusb_ids [] = {
- { USB_DEVICE(0x0547, 0x2131) },
- { USB_DEVICE(0x0547, 0x9999) },
- { } /* Terminating entry */
- };
- MODULE_DEVICE_TABLE (usb, dabusb_ids);
- static struct usb_driver dabusb_driver =
- {
- name: "dabusb",
- probe: dabusb_probe,
- disconnect: dabusb_disconnect,
- fops: &dabusb_fops,
- minor: DABUSB_MINOR,
- id_table: dabusb_ids,
- };
- /* --------------------------------------------------------------------- */
- 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");
- info(DRIVER_VERSION ":" DRIVER_DESC);
- return 0;
- }
- static void __exit dabusb_cleanup (void)
- {
- dbg("dabusb_cleanup");
- usb_deregister (&dabusb_driver);
- }
- /* --------------------------------------------------------------------- */
- MODULE_AUTHOR( DRIVER_AUTHOR );
- MODULE_DESCRIPTION( DRIVER_DESC );
- MODULE_LICENSE("GPL");
- MODULE_PARM (buffers, "i");
- MODULE_PARM_DESC (buffers, "Number of buffers (default=256)");
- module_init (dabusb_init);
- module_exit (dabusb_cleanup);
- /* --------------------------------------------------------------------- */