mdc800.c
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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 Protocoll 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 <520047054719-0001@t-online.de>
- * (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@lrz.uni-muenchen.de> 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/version.h>
- #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/usb.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];
- purb_t 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
- purb_t write_urb;
- char* write_urb_buffer;
- wait_queue_head_t write_wait;
- int written;
- purb_t 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 semaphore 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;
- };
- /* Specification of the Endpoints */
- static struct usb_endpoint_descriptor mdc800_ed [4] =
- {
- { 0,0, 0x01, 0x02, 8, 0,0,0 },
- { 0,0, 0x82, 0x03, 8, 0,0,0 },
- { 0,0, 0x03, 0x02, 64, 0,0,0 },
- { 0,0, 0x84, 0x02, 64, 0,0,0 }
- };
- /* The Variable used by the driver */
- static struct mdc800_data* mdc800=0;
- /***************************************************************************
- 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 wether 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 wether 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_interruptible (&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)
- {
- DECLARE_WAITQUEUE(wait, current);
- mdc800->camera_request_ready=1+mode;
- add_wait_queue(&mdc800->irq_wait, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
- if (!mdc800->irq_woken)
- {
- schedule_timeout (msec*HZ/1000);
- }
- remove_wait_queue(&mdc800->irq_wait, &wait);
- set_current_state(TASK_RUNNING);
- 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_interruptible (&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_interruptible (&mdc800->download_wait);
- }
- /***************************************************************************
- Probing for the Camera
- ***************************************************************************/
- static struct usb_driver mdc800_usb_driver;
- /*
- * Callback to search the Mustek MDC800 on the USB Bus
- */
- static void* mdc800_usb_probe (struct usb_device *dev ,unsigned int ifnum,
- const struct usb_device_id *id)
- {
- int i,j;
- struct usb_interface_descriptor *intf_desc;
- int irq_interval=0;
- dbg ("(mdc800_usb_probe) called.");
- if (mdc800->dev != 0)
- {
- warn ("only one Mustek MDC800 is supported.");
- return 0;
- }
- if (dev->descriptor.bNumConfigurations != 1)
- {
- err ("probe fails -> wrong Number of Configuration");
- return 0;
- }
- intf_desc=&dev->actconfig->interface[ifnum].altsetting[0];
- if (
- ( intf_desc->bInterfaceClass != 0xff )
- || ( intf_desc->bInterfaceSubClass != 0 )
- || ( intf_desc->bInterfaceProtocol != 0 )
- || ( intf_desc->bNumEndpoints != 4)
- )
- {
- err ("probe fails -> wrong Interface");
- return 0;
- }
- /* 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],&mdc800_ed [i]))
- {
- mdc800->endpoint[i]=intf_desc->endpoint [j].bEndpointAddress ;
- if (i==1)
- {
- irq_interval=intf_desc->endpoint [j].bInterval;
- }
- continue;
- }
- }
- if (mdc800->endpoint[i] == -1)
- {
- err ("probe fails -> Wrong Endpoints.");
- return 0;
- }
- }
- usb_driver_claim_interface (&mdc800_usb_driver, &dev->actconfig->interface[ifnum], mdc800);
- if (usb_set_interface (dev, ifnum, 0) < 0)
- {
- err ("MDC800 Configuration fails.");
- return 0;
- }
- info ("Found Mustek MDC800 on USB.");
- down (&mdc800->io_lock);
- mdc800->dev=dev;
- mdc800->open=0;
- /* Setup URB Structs */
- 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
- );
- 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
- );
- 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;
- up (&mdc800->io_lock);
-
- return mdc800;
- }
- /*
- * Disconnect USB device (maybe the MDC800)
- */
- static void mdc800_usb_disconnect (struct usb_device *dev,void* ptr)
- {
- struct mdc800_data* mdc800=(struct mdc800_data*) ptr;
- dbg ("(mdc800_usb_disconnect) called");
- if (mdc800->state == NOT_CONNECTED)
- return;
-
- mdc800->state=NOT_CONNECTED;
- usb_unlink_urb (mdc800->irq_urb);
- usb_unlink_urb (mdc800->write_urb);
- usb_unlink_urb (mdc800->download_urb);
- usb_driver_release_interface (&mdc800_usb_driver, &dev->actconfig->interface[1]);
- mdc800->dev=0;
- 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;
- down (&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))
- {
- 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:
- up (&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.");
- down (&mdc800->io_lock);
- if (mdc800->open && (mdc800->state != NOT_CONNECTED))
- {
- usb_unlink_urb (mdc800->irq_urb);
- usb_unlink_urb (mdc800->write_urb);
- usb_unlink_urb (mdc800->download_urb);
- mdc800->open=0;
- }
- else
- {
- retval=-EIO;
- }
- up(&mdc800->io_lock);
- return retval;
- }
- /*
- * The Device read callback Function
- */
- static ssize_t mdc800_device_read (struct file *file, char *buf, size_t len, loff_t *pos)
- {
- int left=len, sts=len; /* single transfer size */
- char* ptr=buf;
- DECLARE_WAITQUEUE(wait, current);
- down (&mdc800->io_lock);
- if (mdc800->state == NOT_CONNECTED)
- {
- up (&mdc800->io_lock);
- return -EBUSY;
- }
- if (mdc800->state == WORKING)
- {
- warn ("Illegal State "working" reached during read ?!");
- up (&mdc800->io_lock);
- return -EBUSY;
- }
- if (!mdc800->open)
- {
- up (&mdc800->io_lock);
- return -EBUSY;
- }
- while (left)
- {
- if (signal_pending (current))
- {
- up (&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))
- {
- err ("Can't submit download urb (status=%i)",mdc800->download_urb->status);
- up (&mdc800->io_lock);
- return len-left;
- }
- add_wait_queue(&mdc800->download_wait, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
- if (!mdc800->downloaded)
- {
- schedule_timeout (TO_DOWNLOAD_GET_READY*HZ/1000);
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&mdc800->download_wait, &wait);
- mdc800->downloaded = 0;
- if (mdc800->download_urb->status != 0)
- {
- err ("request download-bytes fails (status=%i)",mdc800->download_urb->status);
- up (&mdc800->io_lock);
- return len-left;
- }
- }
- else
- {
- /* No more bytes -> that's an error*/
- up (&mdc800->io_lock);
- return -EIO;
- }
- }
- else
- {
- /* memcpy Bytes */
- memcpy (ptr, &mdc800->out [mdc800->out_ptr], sts);
- ptr+=sts;
- left-=sts;
- mdc800->out_ptr+=sts;
- }
- }
- up (&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 *buf, size_t len, loff_t *pos)
- {
- int i=0;
- DECLARE_WAITQUEUE(wait, current);
- down (&mdc800->io_lock);
- if (mdc800->state != READY)
- {
- up (&mdc800->io_lock);
- return -EBUSY;
- }
- if (!mdc800->open )
- {
- up (&mdc800->io_lock);
- return -EBUSY;
- }
- while (i<len)
- {
- if (signal_pending (current))
- {
- up (&mdc800->io_lock);
- return -EINTR;
- }
- /* check for command start */
- if (buf [i] == (char) 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]=buf[i];
- mdc800->in_count++;
- }
- else
- {
- err ("Command is to long !n");
- up (&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");
- up (&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))
- {
- err ("submitting write urb fails (status=%i)", mdc800->write_urb->status);
- up (&mdc800->io_lock);
- return -EIO;
- }
- add_wait_queue(&mdc800->write_wait, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
- if (!mdc800->written)
- {
- schedule_timeout (TO_WRITE_GET_READY*HZ/1000);
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&mdc800->write_wait, &wait);
- mdc800->written = 0;
- if (mdc800->state == WORKING)
- {
- usb_unlink_urb (mdc800->write_urb);
- up (&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;
- up (&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");
- up (&mdc800->io_lock);
- return -EIO;
- }
- /* Write dummy data, (this is ugly but part of the USB Protokoll */
- /* 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.");
- up (&mdc800->io_lock);
- return -EIO;
- }
- }
- mdc800->state=READY;
- break;
- }
- }
- i++;
- }
- up (&mdc800->io_lock);
- return i;
- }
- /***************************************************************************
- Init and Cleanup this driver (Structs and types)
- ****************************************************************************/
- /* File Operations of this drivers */
- static 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,
- fops: &mdc800_device_ops,
- minor: MDC800_DEVICE_MINOR_BASE,
- id_table: mdc800_table
- };
- /************************************************************************
- Init and Cleanup this driver (Main Functions)
- *************************************************************************/
- #define try(A) if ((A) == 0) goto cleanup_on_fail;
- #define try_free_mem(A) if (A != 0) { kfree (A); A=0; }
- #define try_free_urb(A) if (A != 0) { usb_free_urb (A); A=0; }
- int __init usb_mdc800_init (void)
- {
- /* Allocate Memory */
- try (mdc800=kmalloc (sizeof (struct mdc800_data), GFP_KERNEL));
- memset(mdc800, 0, sizeof(struct mdc800_data));
- mdc800->dev=0;
- mdc800->open=0;
- mdc800->state=NOT_CONNECTED;
- init_MUTEX (&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;
- try (mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL));
- try (mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL));
- try (mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL));
- try (mdc800->irq_urb=usb_alloc_urb (0));
- try (mdc800->download_urb=usb_alloc_urb (0));
- try (mdc800->write_urb=usb_alloc_urb (0));
- /* Register the driver */
- if (usb_register (&mdc800_usb_driver) < 0)
- goto cleanup_on_fail;
- info (DRIVER_VERSION ":" DRIVER_DESC);
- return 0;
- /* Clean driver up, when something fails */
- cleanup_on_fail:
- if (mdc800 != 0)
- {
- err ("can't alloc memory!");
- try_free_mem (mdc800->download_urb_buffer);
- try_free_mem (mdc800->write_urb_buffer);
- try_free_mem (mdc800->irq_urb_buffer);
- try_free_urb (mdc800->write_urb);
- try_free_urb (mdc800->download_urb);
- try_free_urb (mdc800->irq_urb);
- kfree (mdc800);
- }
- mdc800=0;
- return -1;
- }
- 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=0;
- }
- module_init (usb_mdc800_init);
- module_exit (usb_mdc800_cleanup);
- MODULE_AUTHOR( DRIVER_AUTHOR );
- MODULE_DESCRIPTION( DRIVER_DESC );
- MODULE_LICENSE("GPL");