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linux/drivers/usb/image/mdc800.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

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/*
* copyright (C) 1999/2000 by Henning Zabel <henning@uni-paderborn.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.
*/
/*
* USB-Kernel Driver for the Mustek MDC800 Digital Camera
* (c) 1999/2000 Henning Zabel <henning@uni-paderborn.de>
*
*
* The driver brings the USB functions of the MDC800 to Linux.
* To use the Camera you must support the USB Protocol of the camera
* to the Kernel Node.
* The Driver uses a misc device Node. Create it with :
* mknod /dev/mustek c 180 32
*
* The driver supports only one camera.
*
* Fix: mdc800 used sleep_on and slept with io_lock held.
* Converted sleep_on to waitqueues with schedule_timeout and made io_lock
* a semaphore from a spinlock.
* by Oliver Neukum <oliver@neukum.name>
* (02/12/2001)
*
* Identify version on module load.
* (08/04/2001) gb
*
* version 0.7.5
* Fixed potential SMP races with Spinlocks.
* Thanks to Oliver Neukum <oliver@neukum.name> who
* noticed the race conditions.
* (30/10/2000)
*
* Fixed: Setting urb->dev before submitting urb.
* by Greg KH <greg@kroah.com>
* (13/10/2000)
*
* version 0.7.3
* bugfix : The mdc800->state field gets set to READY after the
* the diconnect function sets it to NOT_CONNECTED. This makes the
* driver running like the camera is connected and causes some
* hang ups.
*
* version 0.7.1
* MOD_INC and MOD_DEC are changed in usb_probe to prevent load/unload
* problems when compiled as Module.
* (04/04/2000)
*
* The mdc800 driver gets assigned the USB Minor 32-47. The Registration
* was updated to use these values.
* (26/03/2000)
*
* The Init und Exit Module Function are updated.
* (01/03/2000)
*
* version 0.7.0
* Rewrite of the driver : The driver now uses URB's. The old stuff
* has been removed.
*
* version 0.6.0
* Rewrite of this driver: The Emulation of the rs232 protocoll
* has been removed from the driver. A special executeCommand function
* for this driver is included to gphoto.
* The driver supports two kind of communication to bulk endpoints.
* Either with the dev->bus->ops->bulk... or with callback function.
* (09/11/1999)
*
* version 0.5.0:
* first Version that gets a version number. Most of the needed
* functions work.
* (20/10/1999)
*/
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/smp_lock.h>
#include <linux/wait.h>
#include <linux/mutex.h>
#include <linux/usb.h>
#include <linux/fs.h>
/*
* Version Information
*/
#define DRIVER_VERSION "v0.7.5 (30/10/2000)"
#define DRIVER_AUTHOR "Henning Zabel <henning@uni-paderborn.de>"
#define DRIVER_DESC "USB Driver for Mustek MDC800 Digital Camera"
/* Vendor and Product Information */
#define MDC800_VENDOR_ID 0x055f
#define MDC800_PRODUCT_ID 0xa800
/* Timeouts (msec) */
#define TO_DOWNLOAD_GET_READY 1500
#define TO_DOWNLOAD_GET_BUSY 1500
#define TO_WRITE_GET_READY 1000
#define TO_DEFAULT_COMMAND 5000
#define TO_READ_FROM_IRQ TO_DEFAULT_COMMAND
#define TO_GET_READY TO_DEFAULT_COMMAND
/* Minor Number of the device (create with mknod /dev/mustek c 180 32) */
#define MDC800_DEVICE_MINOR_BASE 32
/**************************************************************************
Data and structs
***************************************************************************/
typedef enum {
NOT_CONNECTED, READY, WORKING, DOWNLOAD
} mdc800_state;
/* Data for the driver */
struct mdc800_data
{
struct usb_device * dev; // Device Data
mdc800_state state;
unsigned int endpoint [4];
struct urb * irq_urb;
wait_queue_head_t irq_wait;
int irq_woken;
char* irq_urb_buffer;
int camera_busy; // is camera busy ?
int camera_request_ready; // Status to synchronize with irq
char camera_response [8]; // last Bytes send after busy
struct urb * write_urb;
char* write_urb_buffer;
wait_queue_head_t write_wait;
int written;
struct urb * download_urb;
char* download_urb_buffer;
wait_queue_head_t download_wait;
int downloaded;
int download_left; // Bytes left to download ?
/* Device Data */
char out [64]; // Answer Buffer
int out_ptr; // Index to the first not readen byte
int out_count; // Bytes in the buffer
int open; // Camera device open ?
struct mutex io_lock; // IO -lock
char in [8]; // Command Input Buffer
int in_count;
int pic_index; // Cache for the Imagesize (-1 for nothing cached )
int pic_len;
int minor;
};
/* Specification of the Endpoints */
static struct usb_endpoint_descriptor mdc800_ed [4] =
{
{
.bLength = 0,
.bDescriptorType = 0,
.bEndpointAddress = 0x01,
.bmAttributes = 0x02,
.wMaxPacketSize = __constant_cpu_to_le16(8),
.bInterval = 0,
.bRefresh = 0,
.bSynchAddress = 0,
},
{
.bLength = 0,
.bDescriptorType = 0,
.bEndpointAddress = 0x82,
.bmAttributes = 0x03,
.wMaxPacketSize = __constant_cpu_to_le16(8),
.bInterval = 0,
.bRefresh = 0,
.bSynchAddress = 0,
},
{
.bLength = 0,
.bDescriptorType = 0,
.bEndpointAddress = 0x03,
.bmAttributes = 0x02,
.wMaxPacketSize = __constant_cpu_to_le16(64),
.bInterval = 0,
.bRefresh = 0,
.bSynchAddress = 0,
},
{
.bLength = 0,
.bDescriptorType = 0,
.bEndpointAddress = 0x84,
.bmAttributes = 0x02,
.wMaxPacketSize = __constant_cpu_to_le16(64),
.bInterval = 0,
.bRefresh = 0,
.bSynchAddress = 0,
},
};
/* The Variable used by the driver */
static struct mdc800_data* mdc800;
/***************************************************************************
The USB Part of the driver
****************************************************************************/
static int mdc800_endpoint_equals (struct usb_endpoint_descriptor *a,struct usb_endpoint_descriptor *b)
{
return (
( a->bEndpointAddress == b->bEndpointAddress )
&& ( a->bmAttributes == b->bmAttributes )
&& ( a->wMaxPacketSize == b->wMaxPacketSize )
);
}
/*
* Checks whether the camera responds busy
*/
static int mdc800_isBusy (char* ch)
{
int i=0;
while (i<8)
{
if (ch [i] != (char)0x99)
return 0;
i++;
}
return 1;
}
/*
* Checks whether the Camera is ready
*/
static int mdc800_isReady (char *ch)
{
int i=0;
while (i<8)
{
if (ch [i] != (char)0xbb)
return 0;
i++;
}
return 1;
}
/*
* USB IRQ Handler for InputLine
*/
static void mdc800_usb_irq (struct urb *urb)
{
int data_received=0, wake_up;
unsigned char* b=urb->transfer_buffer;
struct mdc800_data* mdc800=urb->context;
if (urb->status >= 0)
{
//dbg ("%i %i %i %i %i %i %i %i \n",b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7]);
if (mdc800_isBusy (b))
{
if (!mdc800->camera_busy)
{
mdc800->camera_busy=1;
dbg ("gets busy");
}
}
else
{
if (mdc800->camera_busy && mdc800_isReady (b))
{
mdc800->camera_busy=0;
dbg ("gets ready");
}
}
if (!(mdc800_isBusy (b) || mdc800_isReady (b)))
{
/* Store Data in camera_answer field */
dbg ("%i %i %i %i %i %i %i %i ",b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7]);
memcpy (mdc800->camera_response,b,8);
data_received=1;
}
}
wake_up= ( mdc800->camera_request_ready > 0 )
&&
(
((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy))
||
((mdc800->camera_request_ready == 2) && data_received)
||
((mdc800->camera_request_ready == 3) && (mdc800->camera_busy))
||
(urb->status < 0)
);
if (wake_up)
{
mdc800->camera_request_ready=0;
mdc800->irq_woken=1;
wake_up (&mdc800->irq_wait);
}
}
/*
* Waits a while until the irq responds that camera is ready
*
* mode : 0: Wait for camera gets ready
* 1: Wait for receiving data
* 2: Wait for camera gets busy
*
* msec: Time to wait
*/
static int mdc800_usb_waitForIRQ (int mode, int msec)
{
mdc800->camera_request_ready=1+mode;
wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken, msec*HZ/1000);
mdc800->irq_woken = 0;
if (mdc800->camera_request_ready>0)
{
mdc800->camera_request_ready=0;
err ("timeout waiting for camera.");
return -1;
}
if (mdc800->state == NOT_CONNECTED)
{
warn ("Camera gets disconnected during waiting for irq.");
mdc800->camera_request_ready=0;
return -2;
}
return 0;
}
/*
* The write_urb callback function
*/
static void mdc800_usb_write_notify (struct urb *urb)
{
struct mdc800_data* mdc800=urb->context;
if (urb->status != 0)
{
err ("writing command fails (status=%i)", urb->status);
}
else
{
mdc800->state=READY;
}
mdc800->written = 1;
wake_up (&mdc800->write_wait);
}
/*
* The download_urb callback function
*/
static void mdc800_usb_download_notify (struct urb *urb)
{
struct mdc800_data* mdc800=urb->context;
if (urb->status == 0)
{
/* Fill output buffer with these data */
memcpy (mdc800->out, urb->transfer_buffer, 64);
mdc800->out_count=64;
mdc800->out_ptr=0;
mdc800->download_left-=64;
if (mdc800->download_left == 0)
{
mdc800->state=READY;
}
}
else
{
err ("request bytes fails (status:%i)", urb->status);
}
mdc800->downloaded = 1;
wake_up (&mdc800->download_wait);
}
/***************************************************************************
Probing for the Camera
***************************************************************************/
static struct usb_driver mdc800_usb_driver;
static const struct file_operations mdc800_device_ops;
static struct usb_class_driver mdc800_class = {
.name = "mdc800%d",
.fops = &mdc800_device_ops,
.minor_base = MDC800_DEVICE_MINOR_BASE,
};
/*
* Callback to search the Mustek MDC800 on the USB Bus
*/
static int mdc800_usb_probe (struct usb_interface *intf,
const struct usb_device_id *id)
{
int i,j;
struct usb_host_interface *intf_desc;
struct usb_device *dev = interface_to_usbdev (intf);
int irq_interval=0;
int retval;
dbg ("(mdc800_usb_probe) called.");
if (mdc800->dev != NULL)
{
warn ("only one Mustek MDC800 is supported.");
return -ENODEV;
}
if (dev->descriptor.bNumConfigurations != 1)
{
err ("probe fails -> wrong Number of Configuration");
return -ENODEV;
}
intf_desc = intf->cur_altsetting;
if (
( intf_desc->desc.bInterfaceClass != 0xff )
|| ( intf_desc->desc.bInterfaceSubClass != 0 )
|| ( intf_desc->desc.bInterfaceProtocol != 0 )
|| ( intf_desc->desc.bNumEndpoints != 4)
)
{
err ("probe fails -> wrong Interface");
return -ENODEV;
}
/* Check the Endpoints */
for (i=0; i<4; i++)
{
mdc800->endpoint[i]=-1;
for (j=0; j<4; j++)
{
if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i]))
{
mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ;
if (i==1)
{
irq_interval=intf_desc->endpoint [j].desc.bInterval;
}
continue;
}
}
if (mdc800->endpoint[i] == -1)
{
err ("probe fails -> Wrong Endpoints.");
return -ENODEV;
}
}
info ("Found Mustek MDC800 on USB.");
mutex_lock(&mdc800->io_lock);
retval = usb_register_dev(intf, &mdc800_class);
if (retval) {
err ("Not able to get a minor for this device.");
return -ENODEV;
}
mdc800->dev=dev;
mdc800->open=0;
/* Setup URB Structs */
usb_fill_int_urb (
mdc800->irq_urb,
mdc800->dev,
usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]),
mdc800->irq_urb_buffer,
8,
mdc800_usb_irq,
mdc800,
irq_interval
);
usb_fill_bulk_urb (
mdc800->write_urb,
mdc800->dev,
usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]),
mdc800->write_urb_buffer,
8,
mdc800_usb_write_notify,
mdc800
);
usb_fill_bulk_urb (
mdc800->download_urb,
mdc800->dev,
usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]),
mdc800->download_urb_buffer,
64,
mdc800_usb_download_notify,
mdc800
);
mdc800->state=READY;
mutex_unlock(&mdc800->io_lock);
usb_set_intfdata(intf, mdc800);
return 0;
}
/*
* Disconnect USB device (maybe the MDC800)
*/
static void mdc800_usb_disconnect (struct usb_interface *intf)
{
struct mdc800_data* mdc800 = usb_get_intfdata(intf);
dbg ("(mdc800_usb_disconnect) called");
if (mdc800) {
if (mdc800->state == NOT_CONNECTED)
return;
usb_deregister_dev(intf, &mdc800_class);
mdc800->state=NOT_CONNECTED;
usb_kill_urb(mdc800->irq_urb);
usb_kill_urb(mdc800->write_urb);
usb_kill_urb(mdc800->download_urb);
mdc800->dev = NULL;
usb_set_intfdata(intf, NULL);
}
info ("Mustek MDC800 disconnected from USB.");
}
/***************************************************************************
The Misc device Part (file_operations)
****************************************************************************/
/*
* This Function calc the Answersize for a command.
*/
static int mdc800_getAnswerSize (char command)
{
switch ((unsigned char) command)
{
case 0x2a:
case 0x49:
case 0x51:
case 0x0d:
case 0x20:
case 0x07:
case 0x01:
case 0x25:
case 0x00:
return 8;
case 0x05:
case 0x3e:
return mdc800->pic_len;
case 0x09:
return 4096;
default:
return 0;
}
}
/*
* Init the device: (1) alloc mem (2) Increase MOD Count ..
*/
static int mdc800_device_open (struct inode* inode, struct file *file)
{
int retval=0;
int errn=0;
mutex_lock(&mdc800->io_lock);
if (mdc800->state == NOT_CONNECTED)
{
errn=-EBUSY;
goto error_out;
}
if (mdc800->open)
{
errn=-EBUSY;
goto error_out;
}
mdc800->in_count=0;
mdc800->out_count=0;
mdc800->out_ptr=0;
mdc800->pic_index=0;
mdc800->pic_len=-1;
mdc800->download_left=0;
mdc800->camera_busy=0;
mdc800->camera_request_ready=0;
retval=0;
mdc800->irq_urb->dev = mdc800->dev;
if (usb_submit_urb (mdc800->irq_urb, GFP_KERNEL))
{
err ("request USB irq fails (submit_retval=%i urb_status=%i).",retval, mdc800->irq_urb->status);
errn = -EIO;
goto error_out;
}
mdc800->open=1;
dbg ("Mustek MDC800 device opened.");
error_out:
mutex_unlock(&mdc800->io_lock);
return errn;
}
/*
* Close the Camera and release Memory
*/
static int mdc800_device_release (struct inode* inode, struct file *file)
{
int retval=0;
dbg ("Mustek MDC800 device closed.");
mutex_lock(&mdc800->io_lock);
if (mdc800->open && (mdc800->state != NOT_CONNECTED))
{
usb_kill_urb(mdc800->irq_urb);
usb_kill_urb(mdc800->write_urb);
usb_kill_urb(mdc800->download_urb);
mdc800->open=0;
}
else
{
retval=-EIO;
}
mutex_unlock(&mdc800->io_lock);
return retval;
}
/*
* The Device read callback Function
*/
static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
{
size_t left=len, sts=len; /* single transfer size */
char __user *ptr = buf;
mutex_lock(&mdc800->io_lock);
if (mdc800->state == NOT_CONNECTED)
{
mutex_unlock(&mdc800->io_lock);
return -EBUSY;
}
if (mdc800->state == WORKING)
{
warn ("Illegal State \"working\" reached during read ?!");
mutex_unlock(&mdc800->io_lock);
return -EBUSY;
}
if (!mdc800->open)
{
mutex_unlock(&mdc800->io_lock);
return -EBUSY;
}
while (left)
{
if (signal_pending (current))
{
mutex_unlock(&mdc800->io_lock);
return -EINTR;
}
sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;
if (sts <= 0)
{
/* Too less Data in buffer */
if (mdc800->state == DOWNLOAD)
{
mdc800->out_count=0;
mdc800->out_ptr=0;
/* Download -> Request new bytes */
mdc800->download_urb->dev = mdc800->dev;
if (usb_submit_urb (mdc800->download_urb, GFP_KERNEL))
{
err ("Can't submit download urb (status=%i)",mdc800->download_urb->status);
mutex_unlock(&mdc800->io_lock);
return len-left;
}
wait_event_timeout(mdc800->download_wait, mdc800->downloaded,
TO_DOWNLOAD_GET_READY*HZ/1000);
mdc800->downloaded = 0;
if (mdc800->download_urb->status != 0)
{
err ("request download-bytes fails (status=%i)",mdc800->download_urb->status);
mutex_unlock(&mdc800->io_lock);
return len-left;
}
}
else
{
/* No more bytes -> that's an error*/
mutex_unlock(&mdc800->io_lock);
return -EIO;
}
}
else
{
/* Copy Bytes */
if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
sts)) {
mutex_unlock(&mdc800->io_lock);
return -EFAULT;
}
ptr+=sts;
left-=sts;
mdc800->out_ptr+=sts;
}
}
mutex_unlock(&mdc800->io_lock);
return len-left;
}
/*
* The Device write callback Function
* If a 8Byte Command is received, it will be send to the camera.
* After this the driver initiates the request for the answer or
* just waits until the camera becomes ready.
*/
static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
{
size_t i=0;
mutex_lock(&mdc800->io_lock);
if (mdc800->state != READY)
{
mutex_unlock(&mdc800->io_lock);
return -EBUSY;
}
if (!mdc800->open )
{
mutex_unlock(&mdc800->io_lock);
return -EBUSY;
}
while (i<len)
{
unsigned char c;
if (signal_pending (current))
{
mutex_unlock(&mdc800->io_lock);
return -EINTR;
}
if(get_user(c, buf+i))
{
mutex_unlock(&mdc800->io_lock);
return -EFAULT;
}
/* check for command start */
if (c == 0x55)
{
mdc800->in_count=0;
mdc800->out_count=0;
mdc800->out_ptr=0;
mdc800->download_left=0;
}
/* save command byte */
if (mdc800->in_count < 8)
{
mdc800->in[mdc800->in_count] = c;
mdc800->in_count++;
}
else
{
mutex_unlock(&mdc800->io_lock);
return -EIO;
}
/* Command Buffer full ? -> send it to camera */
if (mdc800->in_count == 8)
{
int answersize;
if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
{
err ("Camera didn't get ready.\n");
mutex_unlock(&mdc800->io_lock);
return -EIO;
}
answersize=mdc800_getAnswerSize (mdc800->in[1]);
mdc800->state=WORKING;
memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
mdc800->write_urb->dev = mdc800->dev;
if (usb_submit_urb (mdc800->write_urb, GFP_KERNEL))
{
err ("submitting write urb fails (status=%i)", mdc800->write_urb->status);
mutex_unlock(&mdc800->io_lock);
return -EIO;
}
wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000);
mdc800->written = 0;
if (mdc800->state == WORKING)
{
usb_kill_urb(mdc800->write_urb);
mutex_unlock(&mdc800->io_lock);
return -EIO;
}
switch ((unsigned char) mdc800->in[1])
{
case 0x05: /* Download Image */
case 0x3e: /* Take shot in Fine Mode (WCam Mode) */
if (mdc800->pic_len < 0)
{
err ("call 0x07 before 0x05,0x3e");
mdc800->state=READY;
mutex_unlock(&mdc800->io_lock);
return -EIO;
}
mdc800->pic_len=-1;
case 0x09: /* Download Thumbnail */
mdc800->download_left=answersize+64;
mdc800->state=DOWNLOAD;
mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY);
break;
default:
if (answersize)
{
if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ))
{
err ("requesting answer from irq fails");
mutex_unlock(&mdc800->io_lock);
return -EIO;
}
/* Write dummy data, (this is ugly but part of the USB Protocol */
/* if you use endpoint 1 as bulk and not as irq) */
memcpy (mdc800->out, mdc800->camera_response,8);
/* This is the interpreted answer */
memcpy (&mdc800->out[8], mdc800->camera_response,8);
mdc800->out_ptr=0;
mdc800->out_count=16;
/* Cache the Imagesize, if command was getImageSize */
if (mdc800->in [1] == (char) 0x07)
{
mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2];
dbg ("cached imagesize = %i",mdc800->pic_len);
}
}
else
{
if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
{
err ("Command Timeout.");
mutex_unlock(&mdc800->io_lock);
return -EIO;
}
}
mdc800->state=READY;
break;
}
}
i++;
}
mutex_unlock(&mdc800->io_lock);
return i;
}
/***************************************************************************
Init and Cleanup this driver (Structs and types)
****************************************************************************/
/* File Operations of this drivers */
static const struct file_operations mdc800_device_ops =
{
.owner = THIS_MODULE,
.read = mdc800_device_read,
.write = mdc800_device_write,
.open = mdc800_device_open,
.release = mdc800_device_release,
};
static struct usb_device_id mdc800_table [] = {
{ USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, mdc800_table);
/*
* USB Driver Struct for this device
*/
static struct usb_driver mdc800_usb_driver =
{
.name = "mdc800",
.probe = mdc800_usb_probe,
.disconnect = mdc800_usb_disconnect,
.id_table = mdc800_table
};
/************************************************************************
Init and Cleanup this driver (Main Functions)
*************************************************************************/
static int __init usb_mdc800_init (void)
{
int retval = -ENODEV;
/* Allocate Memory */
mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL);
if (!mdc800)
goto cleanup_on_fail;
mdc800->dev = NULL;
mdc800->state=NOT_CONNECTED;
mutex_init (&mdc800->io_lock);
init_waitqueue_head (&mdc800->irq_wait);
init_waitqueue_head (&mdc800->write_wait);
init_waitqueue_head (&mdc800->download_wait);
mdc800->irq_woken = 0;
mdc800->downloaded = 0;
mdc800->written = 0;
mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
if (!mdc800->irq_urb_buffer)
goto cleanup_on_fail;
mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
if (!mdc800->write_urb_buffer)
goto cleanup_on_fail;
mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
if (!mdc800->download_urb_buffer)
goto cleanup_on_fail;
mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
if (!mdc800->irq_urb)
goto cleanup_on_fail;
mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
if (!mdc800->download_urb)
goto cleanup_on_fail;
mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
if (!mdc800->write_urb)
goto cleanup_on_fail;
/* Register the driver */
retval = usb_register(&mdc800_usb_driver);
if (retval)
goto cleanup_on_fail;
info (DRIVER_VERSION ":" DRIVER_DESC);
return 0;
/* Clean driver up, when something fails */
cleanup_on_fail:
if (mdc800 != NULL)
{
err ("can't alloc memory!");
kfree(mdc800->download_urb_buffer);
kfree(mdc800->write_urb_buffer);
kfree(mdc800->irq_urb_buffer);
usb_free_urb(mdc800->write_urb);
usb_free_urb(mdc800->download_urb);
usb_free_urb(mdc800->irq_urb);
kfree (mdc800);
}
mdc800 = NULL;
return retval;
}
static void __exit usb_mdc800_cleanup (void)
{
usb_deregister (&mdc800_usb_driver);
usb_free_urb (mdc800->irq_urb);
usb_free_urb (mdc800->download_urb);
usb_free_urb (mdc800->write_urb);
kfree (mdc800->irq_urb_buffer);
kfree (mdc800->write_urb_buffer);
kfree (mdc800->download_urb_buffer);
kfree (mdc800);
mdc800 = NULL;
}
module_init (usb_mdc800_init);
module_exit (usb_mdc800_cleanup);
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
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