Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 886 insertions, 0 deletions

diff --git a/drivers/media/video/cpia_pp.c b/drivers/media/video/cpia_pp.c
new file mode 100644
index 000000000000..ddf184f95d80
--- /dev/null
+++ b/drivers/media/video/cpia_pp.c
@@ -0,0 +1,886 @@
+/*
+ * cpia_pp CPiA Parallel Port driver
+ *
+ * Supports CPiA based parallel port Video Camera's.
+ *
+ * (C) Copyright 1999 Bas Huisman <bhuism@cs.utwente.nl>
+ * (C) Copyright 1999-2000 Scott J. Bertin <sbertin@securenym.net>,
+ * (C) Copyright 1999-2000 Peter Pregler <Peter_Pregler@email.com>
+ *
+ * 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.
+ */
+
+/* define _CPIA_DEBUG_ for verbose debug output (see cpia.h) */
+/* #define _CPIA_DEBUG_  1 */  
+
+#include <linux/config.h>
+
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <linux/kernel.h>
+#include <linux/parport.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/workqueue.h>
+#include <linux/smp_lock.h>
+#include <linux/sched.h>
+
+#include <linux/kmod.h>
+
+/* #define _CPIA_DEBUG_		define for verbose debug output */
+#include "cpia.h"
+
+static int cpia_pp_open(void *privdata);
+static int cpia_pp_registerCallback(void *privdata, void (*cb) (void *cbdata),
+                                    void *cbdata);
+static int cpia_pp_transferCmd(void *privdata, u8 *command, u8 *data);
+static int cpia_pp_streamStart(void *privdata);
+static int cpia_pp_streamStop(void *privdata);
+static int cpia_pp_streamRead(void *privdata, u8 *buffer, int noblock);
+static int cpia_pp_close(void *privdata);
+
+
+#define ABOUT "Parallel port driver for Vision CPiA based cameras"
+
+#define PACKET_LENGTH  8
+
+/* Magic numbers for defining port-device mappings */
+#define PPCPIA_PARPORT_UNSPEC -4
+#define PPCPIA_PARPORT_AUTO -3
+#define PPCPIA_PARPORT_OFF -2
+#define PPCPIA_PARPORT_NONE -1
+
+#ifdef MODULE
+static int parport_nr[PARPORT_MAX] = {[0 ... PARPORT_MAX - 1] = PPCPIA_PARPORT_UNSPEC};
+static char *parport[PARPORT_MAX] = {NULL,};
+
+MODULE_AUTHOR("B. Huisman <bhuism@cs.utwente.nl> & Peter Pregler <Peter_Pregler@email.com>");
+MODULE_DESCRIPTION("Parallel port driver for Vision CPiA based cameras");
+MODULE_LICENSE("GPL");
+
+module_param_array(parport, charp, NULL, 0);
+MODULE_PARM_DESC(parport, "'auto' or a list of parallel port numbers. Just like lp.");
+#else
+static int parport_nr[PARPORT_MAX] __initdata =
+	{[0 ... PARPORT_MAX - 1] = PPCPIA_PARPORT_UNSPEC};
+static int parport_ptr = 0;
+#endif
+
+struct pp_cam_entry {
+	struct pardevice *pdev;
+	struct parport *port;
+	struct work_struct cb_task;
+	int open_count;
+	wait_queue_head_t wq_stream;
+	/* image state flags */
+	int image_ready;	/* we got an interrupt */
+	int image_complete;	/* we have seen 4 EOI */
+
+	int streaming; /* we are in streaming mode */
+	int stream_irq;
+};
+
+static struct cpia_camera_ops cpia_pp_ops = 
+{
+	cpia_pp_open,
+	cpia_pp_registerCallback,
+	cpia_pp_transferCmd,
+	cpia_pp_streamStart,
+	cpia_pp_streamStop,
+	cpia_pp_streamRead,
+	cpia_pp_close,
+	1,
+	THIS_MODULE
+};
+
+static LIST_HEAD(cam_list);
+static spinlock_t cam_list_lock_pp;
+
+/* FIXME */
+static void cpia_parport_enable_irq( struct parport *port ) {
+	parport_enable_irq(port);
+	mdelay(10);
+	return;
+}
+
+static void cpia_parport_disable_irq( struct parport *port ) {
+	parport_disable_irq(port);
+	mdelay(10);
+	return;
+}
+
+/* Special CPiA PPC modes: These are invoked by using the 1284 Extensibility
+ * Link Flag during negotiation */  
+#define UPLOAD_FLAG  0x08
+#define NIBBLE_TRANSFER 0x01
+#define ECP_TRANSFER 0x03
+
+#define PARPORT_CHUNK_SIZE	PAGE_SIZE
+
+
+/****************************************************************************
+ *
+ *  CPiA-specific  low-level parport functions for nibble uploads
+ *
+ ***************************************************************************/
+/*  CPiA nonstandard "Nibble" mode (no nDataAvail signal after each byte). */
+/* The standard kernel parport_ieee1284_read_nibble() fails with the CPiA... */
+
+static size_t cpia_read_nibble (struct parport *port, 
+			 void *buffer, size_t len, 
+			 int flags)
+{
+	/* adapted verbatim, with one change, from 
+	   parport_ieee1284_read_nibble() in drivers/parport/ieee1284-ops.c */
+
+	unsigned char *buf = buffer;
+	int i;
+	unsigned char byte = 0;
+	
+	len *= 2; /* in nibbles */
+	for (i=0; i < len; i++) {
+		unsigned char nibble;
+
+		/* The CPiA firmware suppresses the use of nDataAvail (nFault LO)
+		 * after every second nibble to signal that more
+		 * data is available.  (the total number of Bytes that
+		 * should be sent is known; if too few are received, an error
+		 * will be recorded after a timeout).  
+		 * This is incompatible with parport_ieee1284_read_nibble(),
+		 * which expects to find nFault LO after every second nibble.
+		 */
+
+		/* Solution: modify cpia_read_nibble to only check for 
+		 * nDataAvail before the first nibble is sent.
+		 */
+
+		/* Does the error line indicate end of data? */
+		if (((i /*& 1*/) == 0) &&
+		    (parport_read_status(port) & PARPORT_STATUS_ERROR)) {
+			port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DNA;
+				DBG("%s: No more nibble data (%d bytes)\n",
+				port->name, i/2);
+
+			/* Go to reverse idle phase. */
+			parport_frob_control (port,
+					      PARPORT_CONTROL_AUTOFD,
+					      PARPORT_CONTROL_AUTOFD);
+			port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
+			break;
+		}
+
+		/* Event 7: Set nAutoFd low. */
+		parport_frob_control (port,
+				      PARPORT_CONTROL_AUTOFD,
+				      PARPORT_CONTROL_AUTOFD);
+
+		/* Event 9: nAck goes low. */
+		port->ieee1284.phase = IEEE1284_PH_REV_DATA;
+		if (parport_wait_peripheral (port,
+					     PARPORT_STATUS_ACK, 0)) {
+			/* Timeout -- no more data? */
+				 DBG("%s: Nibble timeout at event 9 (%d bytes)\n",
+				 port->name, i/2);
+			parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
+			break;
+		}
+
+
+		/* Read a nibble. */
+		nibble = parport_read_status (port) >> 3;
+		nibble &= ~8;
+		if ((nibble & 0x10) == 0)
+			nibble |= 8;
+		nibble &= 0xf;
+
+		/* Event 10: Set nAutoFd high. */
+		parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
+
+		/* Event 11: nAck goes high. */
+		if (parport_wait_peripheral (port,
+					     PARPORT_STATUS_ACK,
+					     PARPORT_STATUS_ACK)) {
+			/* Timeout -- no more data? */
+			DBG("%s: Nibble timeout at event 11\n",
+				 port->name);
+			break;
+		}
+
+		if (i & 1) {
+			/* Second nibble */
+			byte |= nibble << 4;
+			*buf++ = byte;
+		} else 
+			byte = nibble;
+	}
+
+	i /= 2; /* i is now in bytes */
+
+	if (i == len) {
+		/* Read the last nibble without checking data avail. */
+		port = port->physport;
+		if (parport_read_status (port) & PARPORT_STATUS_ERROR)
+			port->ieee1284.phase = IEEE1284_PH_HBUSY_DNA;
+		else
+			port->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
+	}
+
+	return i;
+}
+
+/* CPiA nonstandard "Nibble Stream" mode (2 nibbles per cycle, instead of 1)
+ * (See CPiA Data sheet p. 31) 
+ * 
+ * "Nibble Stream" mode used by CPiA for uploads to non-ECP ports is a 
+ * nonstandard variant of nibble mode which allows the same (mediocre) 
+ * data flow of 8 bits per cycle as software-enabled ECP by TRISTATE-capable 
+ * parallel ports, but works also for  non-TRISTATE-capable ports.
+ * (Standard nibble mode only send 4 bits per cycle)
+ *
+ */
+
+static size_t cpia_read_nibble_stream(struct parport *port, 
+			       void *buffer, size_t len, 
+			       int flags)
+{
+	int i;
+	unsigned char *buf = buffer;
+	int endseen = 0;
+
+	for (i=0; i < len; i++) {
+		unsigned char nibble[2], byte = 0;
+		int j;
+
+		/* Image Data is complete when 4 consecutive EOI bytes (0xff) are seen */ 
+		if (endseen > 3 )
+			break;
+
+		/* Event 7: Set nAutoFd low. */
+		parport_frob_control (port,
+				      PARPORT_CONTROL_AUTOFD,
+				      PARPORT_CONTROL_AUTOFD);
+		
+		/* Event 9: nAck goes low. */
+		port->ieee1284.phase = IEEE1284_PH_REV_DATA;
+		if (parport_wait_peripheral (port,
+					     PARPORT_STATUS_ACK, 0)) {
+			/* Timeout -- no more data? */
+				 DBG("%s: Nibble timeout at event 9 (%d bytes)\n",
+				 port->name, i/2);
+			parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
+			break;
+		}
+
+		/* Read lower nibble */
+		nibble[0] = parport_read_status (port) >>3;
+		
+		/* Event 10: Set nAutoFd high. */
+		parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
+
+		/* Event 11: nAck goes high. */
+		if (parport_wait_peripheral (port,
+					     PARPORT_STATUS_ACK,
+					     PARPORT_STATUS_ACK)) {
+			/* Timeout -- no more data? */
+			DBG("%s: Nibble timeout at event 11\n",
+				 port->name);
+			break;
+		}
+		
+		/* Read upper nibble */
+		nibble[1] = parport_read_status (port) >>3;
+		
+		/* reassemble the byte */
+		for (j = 0; j < 2 ; j++ ) {
+			nibble[j] &= ~8;
+			if ((nibble[j] & 0x10) == 0)
+				nibble[j] |= 8;
+			nibble[j] &= 0xf;
+		}
+		byte = (nibble[0] |(nibble[1] << 4));
+		*buf++ = byte;
+
+		if(byte == EOI)
+		  endseen++;
+		else
+		  endseen = 0;
+	}
+	return i;
+}
+
+/****************************************************************************
+ *
+ *  EndTransferMode
+ *
+ ***************************************************************************/
+static void EndTransferMode(struct pp_cam_entry *cam)
+{
+	parport_negotiate(cam->port, IEEE1284_MODE_COMPAT);
+}
+
+/****************************************************************************
+ *
+ *  ForwardSetup
+ *
+ ***************************************************************************/
+static int ForwardSetup(struct pp_cam_entry *cam)
+{
+	int retry;
+	
+	/* The CPiA uses ECP protocol for Downloads from the Host to the camera. 
+	 * This will be software-emulated if ECP hardware is not present
+	 */
+
+	/* the usual camera maximum response time is 10ms, but after receiving
+	 * some commands, it needs up to 40ms. (Data Sheet p. 32)*/
+
+	for(retry = 0; retry < 4; ++retry) {
+		if(!parport_negotiate(cam->port, IEEE1284_MODE_ECP)) {
+			break;
+		}
+		mdelay(10);
+	}
+	if(retry == 4) {
+		DBG("Unable to negotiate IEEE1284 ECP Download mode\n");
+		return -1;
+	}
+	return 0;
+}
+/****************************************************************************
+ *
+ *  ReverseSetup
+ *
+ ***************************************************************************/
+static int ReverseSetup(struct pp_cam_entry *cam, int extensibility)
+{
+	int retry;
+	int upload_mode, mode = IEEE1284_MODE_ECP;
+	int transfer_mode = ECP_TRANSFER;
+
+	if (!(cam->port->modes & PARPORT_MODE_ECP) &&
+	     !(cam->port->modes & PARPORT_MODE_TRISTATE)) {
+		mode = IEEE1284_MODE_NIBBLE;
+		transfer_mode = NIBBLE_TRANSFER;
+	}
+
+	upload_mode = mode;
+	if(extensibility) mode = UPLOAD_FLAG|transfer_mode|IEEE1284_EXT_LINK;
+
+	/* the usual camera maximum response time is 10ms, but after 
+	 * receiving some commands, it needs up to 40ms. */
+		
+	for(retry = 0; retry < 4; ++retry) {
+		if(!parport_negotiate(cam->port, mode)) {
+			break;
+		}
+		mdelay(10);
+	}
+	if(retry == 4) {
+		if(extensibility)
+			DBG("Unable to negotiate upload extensibility mode\n");
+		else
+			DBG("Unable to negotiate upload mode\n");
+		return -1;
+	}
+	if(extensibility) cam->port->ieee1284.mode = upload_mode;
+	return 0;
+}
+
+/****************************************************************************
+ *
+ *  WritePacket
+ *
+ ***************************************************************************/
+static int WritePacket(struct pp_cam_entry *cam, const u8 *packet, size_t size)
+{
+	int retval=0;
+	int size_written;
+
+	if (packet == NULL) {
+		return -EINVAL;
+	}
+	if (ForwardSetup(cam)) {
+		DBG("Write failed in setup\n");
+		return -EIO;
+	}
+	size_written = parport_write(cam->port, packet, size);
+	if(size_written != size) {
+		DBG("Write failed, wrote %d/%d\n", size_written, size);
+		retval = -EIO;
+	}
+	EndTransferMode(cam);
+	return retval;
+}
+
+/****************************************************************************
+ *
+ *  ReadPacket
+ *
+ ***************************************************************************/
+static int ReadPacket(struct pp_cam_entry *cam, u8 *packet, size_t size)
+{
+	int retval=0;
+
+	if (packet == NULL) {
+		return -EINVAL;
+	}
+	if (ReverseSetup(cam, 0)) {
+		return -EIO;
+	}
+
+	/* support for CPiA variant nibble reads */
+	if(cam->port->ieee1284.mode == IEEE1284_MODE_NIBBLE) {
+		if(cpia_read_nibble(cam->port, packet, size, 0) != size) 
+			retval = -EIO;			
+	} else {
+		if(parport_read(cam->port, packet, size) != size) 
+			retval = -EIO;
+	}
+	EndTransferMode(cam);
+	return retval;
+}
+
+/****************************************************************************
+ *
+ *  cpia_pp_streamStart
+ *
+ ***************************************************************************/
+static int cpia_pp_streamStart(void *privdata)
+{
+	struct pp_cam_entry *cam = privdata;
+	DBG("\n");
+	cam->streaming=1;
+	cam->image_ready=0;
+	//if (ReverseSetup(cam,1)) return -EIO;
+	if(cam->stream_irq) cpia_parport_enable_irq(cam->port);
+	return 0;
+}
+
+/****************************************************************************
+ *
+ *  cpia_pp_streamStop
+ *
+ ***************************************************************************/
+static int cpia_pp_streamStop(void *privdata)
+{
+	struct pp_cam_entry *cam = privdata;
+
+	DBG("\n");
+	cam->streaming=0;
+	cpia_parport_disable_irq(cam->port);
+	//EndTransferMode(cam);
+
+	return 0;
+}
+
+/****************************************************************************
+ *
+ *  cpia_pp_streamRead
+ *
+ ***************************************************************************/
+static int cpia_pp_read(struct parport *port, u8 *buffer, int len)
+{
+	int bytes_read;
+
+	/* support for CPiA variant "nibble stream" reads */
+	if(port->ieee1284.mode == IEEE1284_MODE_NIBBLE)
+		bytes_read = cpia_read_nibble_stream(port,buffer,len,0);
+	else {
+		int new_bytes;
+		for(bytes_read=0; bytes_read<len; bytes_read += new_bytes) {
+			new_bytes = parport_read(port, buffer+bytes_read,
+						 len-bytes_read);
+			if(new_bytes < 0) break;
+		}
+	}
+	return bytes_read;
+}
+
+static int cpia_pp_streamRead(void *privdata, u8 *buffer, int noblock)
+{
+	struct pp_cam_entry *cam = privdata;
+	int read_bytes = 0;
+	int i, endseen, block_size, new_bytes;
+
+	if(cam == NULL) {
+		DBG("Internal driver error: cam is NULL\n");
+		return -EINVAL;
+	}
+	if(buffer == NULL) {
+		DBG("Internal driver error: buffer is NULL\n");
+		return -EINVAL;
+	}
+	//if(cam->streaming) DBG("%d / %d\n", cam->image_ready, noblock);
+	if( cam->stream_irq ) {
+		DBG("%d\n", cam->image_ready);
+		cam->image_ready--;
+	}
+	cam->image_complete=0;
+	if (0/*cam->streaming*/) {
+		if(!cam->image_ready) {
+			if(noblock) return -EWOULDBLOCK;
+			interruptible_sleep_on(&cam->wq_stream);
+			if( signal_pending(current) ) return -EINTR;
+			DBG("%d\n", cam->image_ready);
+		}
+	} else {
+		if (ReverseSetup(cam, 1)) {
+			DBG("unable to ReverseSetup\n");
+			return -EIO;
+		}
+	}
+	endseen = 0;
+	block_size = PARPORT_CHUNK_SIZE;
+	while( !cam->image_complete ) {
+		cond_resched();
+		
+		new_bytes = cpia_pp_read(cam->port, buffer, block_size );
+		if( new_bytes <= 0 ) {
+			break;
+		}
+		i=-1;
+		while(++i<new_bytes && endseen<4) {
+	        	if(*buffer==EOI) {
+	                	endseen++;
+	                } else {
+	                	endseen=0;
+	                }
+			buffer++;
+		}
+		read_bytes += i;
+		if( endseen==4 ) {
+			cam->image_complete=1;
+			break;
+		}
+		if( CPIA_MAX_IMAGE_SIZE-read_bytes <= PARPORT_CHUNK_SIZE ) {
+			block_size=CPIA_MAX_IMAGE_SIZE-read_bytes;
+		}
+	}
+	EndTransferMode(cam);
+	return cam->image_complete ? read_bytes : -EIO;
+}
+/****************************************************************************
+ *
+ *  cpia_pp_transferCmd
+ *
+ ***************************************************************************/
+static int cpia_pp_transferCmd(void *privdata, u8 *command, u8 *data)
+{
+	int err;
+	int retval=0;
+	int databytes;
+	struct pp_cam_entry *cam = privdata;
+
+	if(cam == NULL) {
+		DBG("Internal driver error: cam is NULL\n");
+		return -EINVAL;
+	}
+	if(command == NULL) {
+		DBG("Internal driver error: command is NULL\n");
+		return -EINVAL;
+	}
+	databytes = (((int)command[7])<<8) | command[6];
+	if ((err = WritePacket(cam, command, PACKET_LENGTH)) < 0) {
+		DBG("Error writing command\n");
+		return err;
+	}
+	if(command[0] == DATA_IN) {
+		u8 buffer[8];
+		if(data == NULL) {
+			DBG("Internal driver error: data is NULL\n");
+			return -EINVAL;
+		}
+		if((err = ReadPacket(cam, buffer, 8)) < 0) {
+			DBG("Error reading command result\n");
+                       return err;
+		}
+		memcpy(data, buffer, databytes);
+	} else if(command[0] == DATA_OUT) {
+		if(databytes > 0) {
+			if(data == NULL) {
+				DBG("Internal driver error: data is NULL\n");
+				retval = -EINVAL;
+			} else {
+				if((err=WritePacket(cam, data, databytes)) < 0){
+					DBG("Error writing command data\n");
+					return err;
+				}
+			}
+		}
+	} else {
+		DBG("Unexpected first byte of command: %x\n", command[0]);
+		retval = -EINVAL;
+	}
+	return retval;
+}
+
+/****************************************************************************
+ *
+ *  cpia_pp_open
+ *
+ ***************************************************************************/
+static int cpia_pp_open(void *privdata)
+{
+	struct pp_cam_entry *cam = (struct pp_cam_entry *)privdata;
+	
+	if (cam == NULL)
+		return -EINVAL;
+	
+	if(cam->open_count == 0) {
+		if (parport_claim(cam->pdev)) {
+			DBG("failed to claim the port\n");
+			return -EBUSY;
+		}
+		parport_negotiate(cam->port, IEEE1284_MODE_COMPAT);
+		parport_data_forward(cam->port);
+		parport_write_control(cam->port, PARPORT_CONTROL_SELECT);
+		udelay(50);
+		parport_write_control(cam->port,
+		                      PARPORT_CONTROL_SELECT
+		                      | PARPORT_CONTROL_INIT);
+	}
+	
+	++cam->open_count;
+	
+	return 0;
+}
+
+/****************************************************************************
+ *
+ *  cpia_pp_registerCallback
+ *
+ ***************************************************************************/
+static int cpia_pp_registerCallback(void *privdata, void (*cb)(void *cbdata), void *cbdata)
+{
+	struct pp_cam_entry *cam = privdata;
+	int retval = 0;
+	
+	if(cam->port->irq != PARPORT_IRQ_NONE) {
+		INIT_WORK(&cam->cb_task, cb, cbdata);
+	} else {
+		retval = -1;
+	}
+	return retval;
+}
+
+/****************************************************************************
+ *
+ *  cpia_pp_close
+ *
+ ***************************************************************************/
+static int cpia_pp_close(void *privdata)
+{
+	struct pp_cam_entry *cam = privdata;
+	if (--cam->open_count == 0) {
+		parport_release(cam->pdev);
+	}
+	return 0;
+}
+
+/****************************************************************************
+ *
+ *  cpia_pp_register
+ *
+ ***************************************************************************/
+static int cpia_pp_register(struct parport *port)
+{
+	struct pardevice *pdev = NULL;
+	struct pp_cam_entry *cam;
+	struct cam_data *cpia;
+
+	if (!(port->modes & PARPORT_MODE_PCSPP)) {
+		LOG("port is not supported by CPiA driver\n");
+		return -ENXIO;
+	}
+
+	cam = kmalloc(sizeof(struct pp_cam_entry), GFP_KERNEL);
+	if (cam == NULL) {
+		LOG("failed to allocate camera structure\n");
+		return -ENOMEM;
+	}
+	memset(cam,0,sizeof(struct pp_cam_entry));
+	
+	pdev = parport_register_device(port, "cpia_pp", NULL, NULL,
+	                               NULL, 0, cam);
+
+	if (!pdev) {
+		LOG("failed to parport_register_device\n");
+		kfree(cam);
+		return -ENXIO;
+	}
+
+	cam->pdev = pdev;
+	cam->port = port;
+	init_waitqueue_head(&cam->wq_stream);
+
+	cam->streaming = 0;
+	cam->stream_irq = 0;
+
+	if((cpia = cpia_register_camera(&cpia_pp_ops, cam)) == NULL) {
+		LOG("failed to cpia_register_camera\n");
+		parport_unregister_device(pdev);
+		kfree(cam);
+		return -ENXIO;
+	}
+	spin_lock( &cam_list_lock_pp );
+	list_add( &cpia->cam_data_list, &cam_list );
+	spin_unlock( &cam_list_lock_pp );
+
+	return 0;
+}
+
+static void cpia_pp_detach (struct parport *port)
+{
+	struct list_head *tmp;
+	struct cam_data *cpia = NULL;
+	struct pp_cam_entry *cam;
+
+	spin_lock( &cam_list_lock_pp );
+	list_for_each (tmp, &cam_list) {
+		cpia = list_entry(tmp, struct cam_data, cam_data_list);
+		cam = (struct pp_cam_entry *) cpia->lowlevel_data;
+		if (cam && cam->port->number == port->number) {
+			list_del(&cpia->cam_data_list);
+			break;
+		}
+		cpia = NULL;
+	}
+	spin_unlock( &cam_list_lock_pp );			
+
+	if (!cpia) {
+		DBG("cpia_pp_detach failed to find cam_data in cam_list\n");
+		return;
+	}
+	
+	cam = (struct pp_cam_entry *) cpia->lowlevel_data;	
+	cpia_unregister_camera(cpia);
+	if(cam->open_count > 0) 
+		cpia_pp_close(cam);
+	parport_unregister_device(cam->pdev);
+	cpia->lowlevel_data = NULL;	
+	kfree(cam);
+}
+
+static void cpia_pp_attach (struct parport *port)
+{
+	unsigned int i;
+
+	switch (parport_nr[0])
+	{
+	case PPCPIA_PARPORT_UNSPEC:
+	case PPCPIA_PARPORT_AUTO:
+		if (port->probe_info[0].class != PARPORT_CLASS_MEDIA ||
+		    port->probe_info[0].cmdset == NULL ||
+		    strncmp(port->probe_info[0].cmdset, "CPIA_1", 6) != 0)
+			return;
+
+		cpia_pp_register(port);
+
+		break;
+
+	default:
+		for (i = 0; i < PARPORT_MAX; ++i) {
+			if (port->number == parport_nr[i]) {
+				cpia_pp_register(port);
+				break;
+			}
+		}
+		break;
+	}
+}
+
+static struct parport_driver cpia_pp_driver = {
+	.name = "cpia_pp",
+	.attach = cpia_pp_attach,
+	.detach = cpia_pp_detach,
+};
+
+int cpia_pp_init(void)
+{
+	printk(KERN_INFO "%s v%d.%d.%d\n",ABOUT, 
+	       CPIA_PP_MAJ_VER,CPIA_PP_MIN_VER,CPIA_PP_PATCH_VER);
+
+	if(parport_nr[0] == PPCPIA_PARPORT_OFF) {
+		printk("  disabled\n");
+		return 0;
+	}
+	
+	spin_lock_init( &cam_list_lock_pp );
+
+	if (parport_register_driver (&cpia_pp_driver)) {
+		LOG ("unable to register with parport\n");
+		return -EIO;
+	}
+	return 0;
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	if (parport[0]) {
+		/* The user gave some parameters.  Let's see what they were. */
+		if (!strncmp(parport[0], "auto", 4)) {
+			parport_nr[0] = PPCPIA_PARPORT_AUTO;
+		} else {
+			int n;
+			for (n = 0; n < PARPORT_MAX && parport[n]; n++) {
+				if (!strncmp(parport[n], "none", 4)) {
+					parport_nr[n] = PPCPIA_PARPORT_NONE;
+				} else {
+					char *ep;
+					unsigned long r = simple_strtoul(parport[n], &ep, 0);
+					if (ep != parport[n]) {
+						parport_nr[n] = r;
+					} else {
+						LOG("bad port specifier `%s'\n", parport[n]);
+						return -ENODEV;
+					}
+				}
+			}
+		}
+	}
+	return cpia_pp_init();
+}
+
+void cleanup_module(void)
+{
+	parport_unregister_driver (&cpia_pp_driver);
+	return;
+}
+
+#else /* !MODULE */
+
+static int __init cpia_pp_setup(char *str)
+{
+	if (!strncmp(str, "parport", 7)) {
+		int n = simple_strtoul(str + 7, NULL, 10);
+		if (parport_ptr < PARPORT_MAX) {
+			parport_nr[parport_ptr++] = n;
+		} else {
+			LOG("too many ports, %s ignored.\n", str);
+		}
+	} else if (!strcmp(str, "auto")) {
+		parport_nr[0] = PPCPIA_PARPORT_AUTO;
+	} else if (!strcmp(str, "none")) {
+		parport_nr[parport_ptr++] = PPCPIA_PARPORT_NONE;
+	}
+
+	return 0;
+}
+
+__setup("cpia_pp=", cpia_pp_setup);
+
+#endif /* !MODULE */