/*
* 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/version.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/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_PARM(parport, "1-" __MODULE_STRING(PARPORT_MAX) "s");
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 tq_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 ECP_TRANSFER 0x03
#define PARPORT_CHUNK_SIZE PAGE_SIZE
/****************************************************************************
*
* 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;
/* After some commands the camera needs extra time before
* it will respond again, so we try up to 3 times */
for(retry=0; retry<3; ++retry) {
if(!parport_negotiate(cam->port, IEEE1284_MODE_ECP)) {
break;
}
}
if(retry == 3) {
DBG("Unable to negotiate ECP mode\n");
return -1;
}
return 0;
}
/****************************************************************************
*
* ReverseSetup
*
***************************************************************************/
static int ReverseSetup(struct pp_cam_entry *cam, int extensibility)
{
int retry;
int mode = IEEE1284_MODE_ECP;
if(extensibility) mode = UPLOAD_FLAG|ECP_TRANSFER|IEEE1284_EXT_LINK;
/* After some commands the camera needs extra time before
* it will respond again, so we try up to 3 times */
for(retry=0; retry<3; ++retry) {
if(!parport_negotiate(cam->port, mode)) {
break;
}
}
if(retry == 3) {
if(extensibility)
DBG("Unable to negotiate extensibility mode\n");
else
DBG("Unable to negotiate ECP mode\n");
return -1;
}
if(extensibility) cam->port->ieee1284.mode = IEEE1284_MODE_ECP;
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;
}
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, 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 ) {
if(current->need_resched) schedule();
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) {
cam->cb_task.routine = cb;
cam->cb_task.data = 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_ECP) &&
!(port->modes & PARPORT_MODE_TRISTATE)) {
LOG("port is not ECP capable\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 = {
"cpia_pp",
cpia_pp_attach,
cpia_pp_detach,
NULL
};
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;
}
}
}
}
}
#if defined(CONFIG_KMOD) && defined(CONFIG_PNP_PARPORT_MODULE)
if(parport_enumerate() && !parport_enumerate()->probe_info.model) {
request_module("parport_probe");
}
#endif
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 */
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