c-qcam.c

h内核

	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 <[e-mail]>");
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);