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OpenCloudOS-Kernel/drivers/media/video/c-qcam.c

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/*
* Video4Linux Colour QuickCam driver
* Copyright 1997-2000 Philip Blundell <philb@gnu.org>
*
* Module parameters:
*
* parport=auto -- probe all parports (default)
* parport=0 -- parport0 becomes qcam1
* parport=2,0,1 -- parports 2,0,1 are tried in that order
*
* probe=0 -- do no probing, assume camera is present
* probe=1 -- use IEEE-1284 autoprobe data only (default)
* probe=2 -- probe aggressively for cameras
*
* force_rgb=1 -- force data format to RGB (default is BGR)
*
* The parport parameter controls which parports will be scanned.
* Scanning all parports causes some printers to print a garbage page.
* -- March 14, 1999 Billy Donahue <billy@escape.com>
*
* Fixed data format to BGR, added force_rgb parameter. Added missing
* parport_unregister_driver() on module removal.
* -- May 28, 2000 Claudio Matsuoka <claudio@conectiva.com>
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/parport.h>
#include <linux/sched.h>
#include <linux/videodev.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
struct qcam_device {
struct video_device vdev;
struct pardevice *pdev;
struct parport *pport;
int width, height;
int ccd_width, ccd_height;
int mode;
int contrast, brightness, whitebal;
int top, left;
unsigned int bidirectional;
struct semaphore lock;
};
/* cameras maximum */
#define MAX_CAMS 4
/* The three possible QuickCam modes */
#define QC_MILLIONS 0x18
#define QC_BILLIONS 0x10
#define QC_THOUSANDS 0x08 /* with VIDEC compression (not supported) */
/* The three possible decimations */
#define QC_DECIMATION_1 0
#define QC_DECIMATION_2 2
#define QC_DECIMATION_4 4
#define BANNER "Colour QuickCam for Video4Linux v0.05"
static int parport[MAX_CAMS] = { [1 ... MAX_CAMS-1] = -1 };
static int probe = 2;
static int force_rgb = 0;
static int video_nr = -1;
static inline void qcam_set_ack(struct qcam_device *qcam, unsigned int i)
{
/* note: the QC specs refer to the PCAck pin by voltage, not
software level. PC ports have builtin inverters. */
parport_frob_control(qcam->pport, 8, i?8:0);
}
static inline unsigned int qcam_ready1(struct qcam_device *qcam)
{
return (parport_read_status(qcam->pport) & 0x8)?1:0;
}
static inline unsigned int qcam_ready2(struct qcam_device *qcam)
{
return (parport_read_data(qcam->pport) & 0x1)?1:0;
}
static unsigned int qcam_await_ready1(struct qcam_device *qcam,
int value)
{
unsigned long oldjiffies = jiffies;
unsigned int i;
for (oldjiffies = jiffies; (jiffies - oldjiffies) < (HZ/25); )
if (qcam_ready1(qcam) == value)
return 0;
/* If the camera didn't respond within 1/25 second, poll slowly
for a while. */
for (i = 0; i < 50; i++)
{
if (qcam_ready1(qcam) == value)
return 0;
msleep_interruptible(100);
}
/* Probably somebody pulled the plug out. Not much we can do. */
printk(KERN_ERR "c-qcam: ready1 timeout (%d) %x %x\n", value,
parport_read_status(qcam->pport),
parport_read_control(qcam->pport));
return 1;
}
static unsigned int qcam_await_ready2(struct qcam_device *qcam, int value)
{
unsigned long oldjiffies = jiffies;
unsigned int i;
for (oldjiffies = jiffies; (jiffies - oldjiffies) < (HZ/25); )
if (qcam_ready2(qcam) == value)
return 0;
/* If the camera didn't respond within 1/25 second, poll slowly
for a while. */
for (i = 0; i < 50; i++)
{
if (qcam_ready2(qcam) == value)
return 0;
msleep_interruptible(100);
}
/* Probably somebody pulled the plug out. Not much we can do. */
printk(KERN_ERR "c-qcam: ready2 timeout (%d) %x %x %x\n", value,
parport_read_status(qcam->pport),
parport_read_control(qcam->pport),
parport_read_data(qcam->pport));
return 1;
}
static int qcam_read_data(struct qcam_device *qcam)
{
unsigned int idata;
qcam_set_ack(qcam, 0);
if (qcam_await_ready1(qcam, 1)) return -1;
idata = parport_read_status(qcam->pport) & 0xf0;
qcam_set_ack(qcam, 1);
if (qcam_await_ready1(qcam, 0)) return -1;
idata |= (parport_read_status(qcam->pport) >> 4);
return idata;
}
static int qcam_write_data(struct qcam_device *qcam, unsigned int data)
{
unsigned int idata;
parport_write_data(qcam->pport, data);
idata = qcam_read_data(qcam);
if (data != idata)
{
printk(KERN_WARNING "cqcam: sent %x but received %x\n", data,
idata);
return 1;
}
return 0;
}
static inline int qcam_set(struct qcam_device *qcam, unsigned int cmd, unsigned int data)
{
if (qcam_write_data(qcam, cmd))
return -1;
if (qcam_write_data(qcam, data))
return -1;
return 0;
}
static inline int qcam_get(struct qcam_device *qcam, unsigned int cmd)
{
if (qcam_write_data(qcam, cmd))
return -1;
return qcam_read_data(qcam);
}
static int qc_detect(struct qcam_device *qcam)
{
unsigned int stat, ostat, i, count = 0;
/* The probe routine below is not very reliable. The IEEE-1284
probe takes precedence. */
/* XXX Currently parport provides no way to distinguish between
"the IEEE probe was not done" and "the probe was done, but
no device was found". Fix this one day. */
if (qcam->pport->probe_info[0].class == PARPORT_CLASS_MEDIA
&& qcam->pport->probe_info[0].model
&& !strcmp(qcam->pdev->port->probe_info[0].model,
"Color QuickCam 2.0")) {
printk(KERN_DEBUG "QuickCam: Found by IEEE1284 probe.\n");
return 1;
}
if (probe < 2)
return 0;
parport_write_control(qcam->pport, 0xc);
/* look for a heartbeat */
ostat = stat = parport_read_status(qcam->pport);
for (i=0; i<250; i++)
{
mdelay(1);
stat = parport_read_status(qcam->pport);
if (ostat != stat)
{
if (++count >= 3) return 1;
ostat = stat;
}
}
/* Reset the camera and try again */
parport_write_control(qcam->pport, 0xc);
parport_write_control(qcam->pport, 0x8);
mdelay(1);
parport_write_control(qcam->pport, 0xc);
mdelay(1);
count = 0;
ostat = stat = parport_read_status(qcam->pport);
for (i=0; i<250; i++)
{
mdelay(1);
stat = parport_read_status(qcam->pport);
if (ostat != stat)
{
if (++count >= 3) return 1;
ostat = stat;
}
}
/* no (or flatline) camera, give up */
return 0;
}
static void qc_reset(struct qcam_device *qcam)
{
parport_write_control(qcam->pport, 0xc);
parport_write_control(qcam->pport, 0x8);
mdelay(1);
parport_write_control(qcam->pport, 0xc);
mdelay(1);
}
/* Reset the QuickCam and program for brightness, contrast,
* white-balance, and resolution. */
static void qc_setup(struct qcam_device *q)
{
qc_reset(q);
/* Set the brightness. */
qcam_set(q, 11, q->brightness);
/* Set the height and width. These refer to the actual
CCD area *before* applying the selected decimation. */
qcam_set(q, 17, q->ccd_height);
qcam_set(q, 19, q->ccd_width / 2);
/* Set top and left. */
qcam_set(q, 0xd, q->top);
qcam_set(q, 0xf, q->left);
/* Set contrast and white balance. */
qcam_set(q, 0x19, q->contrast);
qcam_set(q, 0x1f, q->whitebal);
/* Set the speed. */
qcam_set(q, 45, 2);
}
/* Read some bytes from the camera and put them in the buffer.
nbytes should be a multiple of 3, because bidirectional mode gives
us three bytes at a time. */
static unsigned int qcam_read_bytes(struct qcam_device *q, unsigned char *buf, unsigned int nbytes)
{
unsigned int bytes = 0;
qcam_set_ack(q, 0);
if (q->bidirectional)
{
/* It's a bidirectional port */
while (bytes < nbytes)
{
unsigned int lo1, hi1, lo2, hi2;
unsigned char r, g, b;
if (qcam_await_ready2(q, 1)) return bytes;
lo1 = parport_read_data(q->pport) >> 1;
hi1 = ((parport_read_status(q->pport) >> 3) & 0x1f) ^ 0x10;
qcam_set_ack(q, 1);
if (qcam_await_ready2(q, 0)) return bytes;
lo2 = parport_read_data(q->pport) >> 1;
hi2 = ((parport_read_status(q->pport) >> 3) & 0x1f) ^ 0x10;
qcam_set_ack(q, 0);
r = (lo1 | ((hi1 & 1)<<7));
g = ((hi1 & 0x1e)<<3) | ((hi2 & 0x1e)>>1);
b = (lo2 | ((hi2 & 1)<<7));
if (force_rgb) {
buf[bytes++] = r;
buf[bytes++] = g;
buf[bytes++] = b;
} else {
buf[bytes++] = b;
buf[bytes++] = g;
buf[bytes++] = r;
}
}
}
else
{
/* It's a unidirectional port */
int i = 0, n = bytes;
unsigned char rgb[3];
while (bytes < nbytes)
{
unsigned int hi, lo;
if (qcam_await_ready1(q, 1)) return bytes;
hi = (parport_read_status(q->pport) & 0xf0);
qcam_set_ack(q, 1);
if (qcam_await_ready1(q, 0)) return bytes;
lo = (parport_read_status(q->pport) & 0xf0);
qcam_set_ack(q, 0);
/* flip some bits */
rgb[(i = bytes++ % 3)] = (hi | (lo >> 4)) ^ 0x88;
if (i >= 2) {
get_fragment:
if (force_rgb) {
buf[n++] = rgb[0];
buf[n++] = rgb[1];
buf[n++] = rgb[2];
} else {
buf[n++] = rgb[2];
buf[n++] = rgb[1];
buf[n++] = rgb[0];
}
}
}
if (i) {
i = 0;
goto get_fragment;
}
}
return bytes;
}
#define BUFSZ 150
static long qc_capture(struct qcam_device *q, char __user *buf, unsigned long len)
{
unsigned lines, pixelsperline, bitsperxfer;
unsigned int is_bi_dir = q->bidirectional;
size_t wantlen, outptr = 0;
char tmpbuf[BUFSZ];
if (!access_ok(VERIFY_WRITE, buf, len))
return -EFAULT;
/* Wait for camera to become ready */
for (;;)
{
int i = qcam_get(q, 41);
if (i == -1) {
qc_setup(q);
return -EIO;
}
if ((i & 0x80) == 0)
break;
else
schedule();
}
if (qcam_set(q, 7, (q->mode | (is_bi_dir?1:0)) + 1))
return -EIO;
lines = q->height;
pixelsperline = q->width;
bitsperxfer = (is_bi_dir) ? 24 : 8;
if (is_bi_dir)
{
/* Turn the port around */
parport_data_reverse(q->pport);
mdelay(3);
qcam_set_ack(q, 0);
if (qcam_await_ready1(q, 1)) {
qc_setup(q);
return -EIO;
}
qcam_set_ack(q, 1);
if (qcam_await_ready1(q, 0)) {
qc_setup(q);
return -EIO;
}
}
wantlen = lines * pixelsperline * 24 / 8;
while (wantlen)
{
size_t t, s;
s = (wantlen > BUFSZ)?BUFSZ:wantlen;
t = qcam_read_bytes(q, tmpbuf, s);
if (outptr < len)
{
size_t sz = len - outptr;
if (sz > t) sz = t;
if (__copy_to_user(buf+outptr, tmpbuf, sz))
break;
outptr += sz;
}
wantlen -= t;
if (t < s)
break;
cond_resched();
}
len = outptr;
if (wantlen)
{
printk("qcam: short read.\n");
if (is_bi_dir)
parport_data_forward(q->pport);
qc_setup(q);
return len;
}
if (is_bi_dir)
{
int l;
do {
l = qcam_read_bytes(q, tmpbuf, 3);
cond_resched();
} while (l && (tmpbuf[0] == 0x7e || tmpbuf[1] == 0x7e || tmpbuf[2] == 0x7e));
if (force_rgb) {
if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
printk("qcam: bad EOF\n");
} else {
if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
printk("qcam: bad EOF\n");
}
qcam_set_ack(q, 0);
if (qcam_await_ready1(q, 1))
{
printk("qcam: no ack after EOF\n");
parport_data_forward(q->pport);
qc_setup(q);
return len;
}
parport_data_forward(q->pport);
mdelay(3);
qcam_set_ack(q, 1);
if (qcam_await_ready1(q, 0))
{
printk("qcam: no ack to port turnaround\n");
qc_setup(q);
return len;
}
}
else
{
int l;
do {
l = qcam_read_bytes(q, tmpbuf, 1);
cond_resched();
} while (l && tmpbuf[0] == 0x7e);
l = qcam_read_bytes(q, tmpbuf+1, 2);
if (force_rgb) {
if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
printk("qcam: bad EOF\n");
} else {
if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
printk("qcam: bad EOF\n");
}
}
qcam_write_data(q, 0);
return len;
}
/*
* Video4linux interfacing
*/
static int qcam_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *dev = video_devdata(file);
struct qcam_device *qcam=(struct qcam_device *)dev;
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability *b = arg;
strcpy(b->name, "Quickcam");
b->type = VID_TYPE_CAPTURE|VID_TYPE_SCALES;
b->channels = 1;
b->audios = 0;
b->maxwidth = 320;
b->maxheight = 240;
b->minwidth = 80;
b->minheight = 60;
return 0;
}
case VIDIOCGCHAN:
{
struct video_channel *v = arg;
if(v->channel!=0)
return -EINVAL;
v->flags=0;
v->tuners=0;
/* Good question.. its composite or SVHS so.. */
v->type = VIDEO_TYPE_CAMERA;
strcpy(v->name, "Camera");
return 0;
}
case VIDIOCSCHAN:
{
struct video_channel *v = arg;
if(v->channel!=0)
return -EINVAL;
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner *v = arg;
if(v->tuner)
return -EINVAL;
memset(v,0,sizeof(*v));
strcpy(v->name, "Format");
v->mode = VIDEO_MODE_AUTO;
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner *v = arg;
if(v->tuner)
return -EINVAL;
if(v->mode!=VIDEO_MODE_AUTO)
return -EINVAL;
return 0;
}
case VIDIOCGPICT:
{
struct video_picture *p = arg;
p->colour=0x8000;
p->hue=0x8000;
p->brightness=qcam->brightness<<8;
p->contrast=qcam->contrast<<8;
p->whiteness=qcam->whitebal<<8;
p->depth=24;
p->palette=VIDEO_PALETTE_RGB24;
return 0;
}
case VIDIOCSPICT:
{
struct video_picture *p = arg;
/*
* Sanity check args
*/
if (p->depth != 24 || p->palette != VIDEO_PALETTE_RGB24)
return -EINVAL;
/*
* Now load the camera.
*/
qcam->brightness = p->brightness>>8;
qcam->contrast = p->contrast>>8;
qcam->whitebal = p->whiteness>>8;
down(&qcam->lock);
parport_claim_or_block(qcam->pdev);
qc_setup(qcam);
parport_release(qcam->pdev);
up(&qcam->lock);
return 0;
}
case VIDIOCSWIN:
{
struct video_window *vw = arg;
if(vw->flags)
return -EINVAL;
if(vw->clipcount)
return -EINVAL;
if(vw->height<60||vw->height>240)
return -EINVAL;
if(vw->width<80||vw->width>320)
return -EINVAL;
qcam->width = 80;
qcam->height = 60;
qcam->mode = QC_DECIMATION_4;
if(vw->width>=160 && vw->height>=120)
{
qcam->width = 160;
qcam->height = 120;
qcam->mode = QC_DECIMATION_2;
}
if(vw->width>=320 && vw->height>=240)
{
qcam->width = 320;
qcam->height = 240;
qcam->mode = QC_DECIMATION_1;
}
qcam->mode |= QC_MILLIONS;
#if 0
if(vw->width>=640 && vw->height>=480)
{
qcam->width = 640;
qcam->height = 480;
qcam->mode = QC_BILLIONS | QC_DECIMATION_1;
}
#endif
/* Ok we figured out what to use from our
wide choice */
down(&qcam->lock);
parport_claim_or_block(qcam->pdev);
qc_setup(qcam);
parport_release(qcam->pdev);
up(&qcam->lock);
return 0;
}
case VIDIOCGWIN:
{
struct video_window *vw = arg;
memset(vw, 0, sizeof(*vw));
vw->width=qcam->width;
vw->height=qcam->height;
return 0;
}
case VIDIOCKEY:
return 0;
case VIDIOCCAPTURE:
case VIDIOCGFBUF:
case VIDIOCSFBUF:
case VIDIOCGFREQ:
case VIDIOCSFREQ:
case VIDIOCGAUDIO:
case VIDIOCSAUDIO:
return -EINVAL;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int qcam_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, qcam_do_ioctl);
}
static ssize_t qcam_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct video_device *v = video_devdata(file);
struct qcam_device *qcam=(struct qcam_device *)v;
int len;
down(&qcam->lock);
parport_claim_or_block(qcam->pdev);
/* Probably should have a semaphore against multiple users */
len = qc_capture(qcam, buf,count);
parport_release(qcam->pdev);
up(&qcam->lock);
return len;
}
/* video device template */
static struct file_operations qcam_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = qcam_ioctl,
.read = qcam_read,
.llseek = no_llseek,
};
static struct video_device qcam_template=
{
.owner = THIS_MODULE,
.name = "Colour QuickCam",
.type = VID_TYPE_CAPTURE,
.hardware = VID_HARDWARE_QCAM_C,
.fops = &qcam_fops,
};
/* Initialize the QuickCam driver control structure. */
static struct qcam_device *qcam_init(struct parport *port)
{
struct qcam_device *q;
q = kmalloc(sizeof(struct qcam_device), GFP_KERNEL);
if(q==NULL)
return NULL;
q->pport = port;
q->pdev = parport_register_device(port, "c-qcam", NULL, NULL,
NULL, 0, NULL);
q->bidirectional = (q->pport->modes & PARPORT_MODE_TRISTATE)?1:0;
if (q->pdev == NULL)
{
printk(KERN_ERR "c-qcam: couldn't register for %s.\n",
port->name);
kfree(q);
return NULL;
}
memcpy(&q->vdev, &qcam_template, sizeof(qcam_template));
init_MUTEX(&q->lock);
q->width = q->ccd_width = 320;
q->height = q->ccd_height = 240;
q->mode = QC_MILLIONS | QC_DECIMATION_1;
q->contrast = 192;
q->brightness = 240;
q->whitebal = 128;
q->top = 1;
q->left = 14;
return q;
}
static struct qcam_device *qcams[MAX_CAMS];
static unsigned int num_cams = 0;
static int init_cqcam(struct parport *port)
{
struct qcam_device *qcam;
if (parport[0] != -1)
{
/* The user gave specific instructions */
int i, found = 0;
for (i = 0; i < MAX_CAMS && parport[i] != -1; i++)
{
if (parport[0] == port->number)
found = 1;
}
if (!found)
return -ENODEV;
}
if (num_cams == MAX_CAMS)
return -ENOSPC;
qcam = qcam_init(port);
if (qcam==NULL)
return -ENODEV;
parport_claim_or_block(qcam->pdev);
qc_reset(qcam);
if (probe && qc_detect(qcam)==0)
{
parport_release(qcam->pdev);
parport_unregister_device(qcam->pdev);
kfree(qcam);
return -ENODEV;
}
qc_setup(qcam);
parport_release(qcam->pdev);
if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr)==-1)
{
printk(KERN_ERR "Unable to register Colour QuickCam on %s\n",
qcam->pport->name);
parport_unregister_device(qcam->pdev);
kfree(qcam);
return -ENODEV;
}
printk(KERN_INFO "video%d: Colour QuickCam found on %s\n",
qcam->vdev.minor, qcam->pport->name);
qcams[num_cams++] = qcam;
return 0;
}
static void close_cqcam(struct qcam_device *qcam)
{
video_unregister_device(&qcam->vdev);
parport_unregister_device(qcam->pdev);
kfree(qcam);
}
static void cq_attach(struct parport *port)
{
init_cqcam(port);
}
static void cq_detach(struct parport *port)
{
/* Write this some day. */
}
static struct parport_driver cqcam_driver = {
.name = "cqcam",
.attach = cq_attach,
.detach = cq_detach,
};
static int __init cqcam_init (void)
{
printk(BANNER "\n");
return parport_register_driver(&cqcam_driver);
}
static void __exit cqcam_cleanup (void)
{
unsigned int i;
for (i = 0; i < num_cams; i++)
close_cqcam(qcams[i]);
parport_unregister_driver(&cqcam_driver);
}
MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
MODULE_DESCRIPTION(BANNER);
MODULE_LICENSE("GPL");
/* FIXME: parport=auto would never have worked, surely? --RR */
MODULE_PARM_DESC(parport ,"parport=<auto|n[,n]...> for port detection method\n\
probe=<0|1|2> for camera detection method\n\
force_rgb=<0|1> for RGB data format (default BGR)");
module_param_array(parport, int, NULL, 0);
module_param(probe, int, 0);
module_param(force_rgb, bool, 0);
module_param(video_nr, int, 0);
module_init(cqcam_init);
module_exit(cqcam_cleanup);
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