kernel-ark/drivers/media/video/dabusb.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

875 lines
20 KiB
C

/*****************************************************************************/
/*
* 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/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 <linux/mutex.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"
/* --------------------------------------------------------------------- */
#ifdef CONFIG_USB_DYNAMIC_MINORS
#define NRDABUSB 256
#else
#define NRDABUSB 4
#endif
/*-------------------------------------------------------------------*/
static dabusb_t dabusb[NRDABUSB];
static int buffers = 256;
static struct usb_driver dabusb_driver;
/*-------------------------------------------------------------------*/
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_move_tail (tmp, dst);
err: spin_unlock_irqrestore (&s->lock, flags);
return ret;
}
/*-------------------------------------------------------------------*/
#ifdef DEBUG
static void dump_urb (struct urb *urb)
{
dbg("urb :%p", urb);
dbg("dev :%p", urb->dev);
dbg("pipe :%08X", urb->pipe);
dbg("status :%d", urb->status);
dbg("transfer_flags :%08X", urb->transfer_flags);
dbg("transfer_buffer :%p", urb->transfer_buffer);
dbg("transfer_buffer_length:%d", urb->transfer_buffer_length);
dbg("actual_length :%d", urb->actual_length);
dbg("setup_packet :%p", urb->setup_packet);
dbg("start_frame :%d", urb->start_frame);
dbg("number_of_packets :%d", urb->number_of_packets);
dbg("interval :%d", urb->interval);
dbg("error_count :%d", urb->error_count);
dbg("context :%p", urb->context);
dbg("complete :%p", urb->complete);
}
#endif
/*-------------------------------------------------------------------*/
static int dabusb_cancel_queue (pdabusb_t s, struct list_head *q)
{
unsigned long flags;
pbuff_t b;
dbg("dabusb_cancel_queue");
spin_lock_irqsave (&s->lock, flags);
list_for_each_entry(b, q, 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
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) kzalloc (sizeof (buff_t), GFP_KERNEL);
if (!b) {
err("kzalloc(sizeof(buff_t))==NULL");
goto err;
}
b->s = s;
b->purb = usb_alloc_urb(packets, GFP_KERNEL);
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 = URB_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, GFP_KERNEL);
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 __user *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: //mutex_unlock(&s->mutex);
return ret;
}
static int dabusb_open (struct inode *inode, struct file *file)
{
int devnum = iminor(inode);
pdabusb_t s;
if (devnum < DABUSB_MINOR || devnum >= (DABUSB_MINOR + NRDABUSB))
return -EIO;
s = &dabusb[devnum - DABUSB_MINOR];
dbg("dabusb_open");
mutex_lock(&s->mutex);
while (!s->usbdev || s->opened) {
mutex_unlock(&s->mutex);
if (file->f_flags & O_NONBLOCK) {
return -EBUSY;
}
msleep_interruptible(500);
if (signal_pending (current)) {
return -EAGAIN;
}
mutex_lock(&s->mutex);
}
if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
mutex_unlock(&s->mutex);
err("set_interface failed");
return -EINVAL;
}
s->opened = 1;
mutex_unlock(&s->mutex);
file->f_pos = 0;
file->private_data = s;
return nonseekable_open(inode, file);
}
static int dabusb_release (struct inode *inode, struct file *file)
{
pdabusb_t s = (pdabusb_t) file->private_data;
dbg("dabusb_release");
mutex_lock(&s->mutex);
dabusb_stop (s);
dabusb_free_buffers (s);
mutex_unlock(&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;
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;
mutex_lock(&s->mutex);
if (!s->usbdev) {
mutex_unlock(&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 __user *) arg, sizeof (bulk_transfer_t))) {
ret = -EFAULT;
kfree (pbulk);
break;
}
ret=dabusb_bulk (s, pbulk);
if(ret==0)
if (copy_to_user((void __user *)arg, pbulk,
sizeof(bulk_transfer_t)))
ret = -EFAULT;
kfree (pbulk);
break;
case IOCTL_DAB_OVERRUNS:
ret = put_user (s->overruns, (unsigned int __user *) arg);
break;
case IOCTL_DAB_VERSION:
ret = put_user (version, (unsigned int __user *) arg);
break;
default:
ret = -ENOIOCTLCMD;
break;
}
mutex_unlock(&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 struct usb_class_driver dabusb_class = {
.name = "dabusb%d",
.fops = &dabusb_fops,
.minor_base = DABUSB_MINOR,
};
/* --------------------------------------------------------------------- */
static int dabusb_probe (struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *usbdev = interface_to_usbdev(intf);
int retval;
pdabusb_t s;
dbg("dabusb: probe: vendor id 0x%x, device id 0x%x ifnum:%d",
le16_to_cpu(usbdev->descriptor.idVendor),
le16_to_cpu(usbdev->descriptor.idProduct),
intf->altsetting->desc.bInterfaceNumber);
/* We don't handle multiple configurations */
if (usbdev->descriptor.bNumConfigurations != 1)
return -ENODEV;
if (intf->altsetting->desc.bInterfaceNumber != _DABUSB_IF &&
le16_to_cpu(usbdev->descriptor.idProduct) == 0x9999)
return -ENODEV;
s = &dabusb[intf->minor];
mutex_lock(&s->mutex);
s->remove_pending = 0;
s->usbdev = usbdev;
s->devnum = intf->minor;
if (usb_reset_configuration (usbdev) < 0) {
err("reset_configuration failed");
goto reject;
}
if (le16_to_cpu(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", intf->altsetting->desc.bInterfaceNumber);
usb_set_intfdata (intf, s);
mutex_unlock(&s->mutex);
retval = usb_register_dev(intf, &dabusb_class);
if (retval) {
usb_set_intfdata (intf, NULL);
return -ENOMEM;
}
return 0;
reject:
mutex_unlock(&s->mutex);
s->usbdev = NULL;
return -ENODEV;
}
static void dabusb_disconnect (struct usb_interface *intf)
{
wait_queue_t __wait;
pdabusb_t s = usb_get_intfdata (intf);
dbg("dabusb_disconnect");
init_waitqueue_entry(&__wait, current);
usb_set_intfdata (intf, NULL);
if (s) {
usb_deregister_dev (intf, &dabusb_class);
s->remove_pending = 1;
wake_up (&s->wait);
add_wait_queue(&s->remove_ok, &__wait);
set_current_state(TASK_UNINTERRUPTIBLE);
if (s->state == _started)
schedule();
current->state = TASK_RUNNING;
remove_wait_queue(&s->remove_ok, &__wait);
s->usbdev = NULL;
s->overruns = 0;
}
}
static struct usb_device_id dabusb_ids [] = {
// { USB_DEVICE(0x0547, 0x2131) }, /* An2131 chip, no boot ROM */
{ 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,
.id_table = dabusb_ids,
};
/* --------------------------------------------------------------------- */
static int __init dabusb_init (void)
{
int retval;
unsigned u;
/* initialize struct */
for (u = 0; u < NRDABUSB; u++) {
pdabusb_t s = &dabusb[u];
memset (s, 0, sizeof (dabusb_t));
mutex_init (&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 */
retval = usb_register(&dabusb_driver);
if (retval)
goto out;
dbg("dabusb_init: driver registered");
info(DRIVER_VERSION ":" DRIVER_DESC);
out:
return retval;
}
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_param(buffers, int, 0);
MODULE_PARM_DESC (buffers, "Number of buffers (default=256)");
module_init (dabusb_init);
module_exit (dabusb_cleanup);
/* --------------------------------------------------------------------- */