/*
* 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/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)) {
DBG("%s: No more nibble data (%d bytes)\n",
port->name, i/2);
goto end_of_data;
}
/* 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;
}
if (i == len) {
/* Read the last nibble without checking data avail. */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
end_of_data:
/* Go to reverse idle phase. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
}
else
port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
}
return i/2;
}
/* 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 = kzalloc(sizeof(struct pp_cam_entry), GFP_KERNEL);
if (cam == NULL) {
LOG("failed to allocate camera structure\n");
return -ENOMEM;
}
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,
};
static 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)
{
int err;
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;
}
err=cpia_pp_init();
if (err)
return err;
return 1;
}
__setup("cpia_pp=", cpia_pp_setup);
#endif /* !MODULE */
