patch-2.1.79 linux/drivers/char/c-qcam.c

• Lines: 776
• Date: Mon Jan 12 14:46:16 1998
• Orig file: v2.1.78/linux/drivers/char/c-qcam.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.78/linux/drivers/char/c-qcam.c linux/drivers/char/c-qcam.c
@@ -0,0 +1,775 @@
+/*
+ *	Video4Linux: Colour QuickCam driver
+ *
+ *	Philip Blundell <philb@gnu.org>, December 30 1997
+ *
+ *	Largely untested (seems to work at 24bpp with a bidirectional port,
+ *	though). 
+ */
+
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/malloc.h>
+#include <linux/mm.h>
+#include <linux/parport.h>
+#include <linux/sched.h>
+#include <linux/version.h>
+#include <linux/videodev.h>
+#include <asm/uaccess.h>
+
+#include "c-qcam.h"
+
+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 inline 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;
+		current->state=TASK_INTERRUPTIBLE;
+		current->timeout = jiffies+HZ/10;
+		schedule();
+	}
+
+	/* 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 inline 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;
+		current->state=TASK_INTERRUPTIBLE;
+		current->timeout = jiffies+HZ/10;
+		schedule();
+	}
+
+	/* 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 inline 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;
+
+	parport_write_control(qcam->pport, 0xc);
+
+	/* look for a heartbeat */
+	ostat = stat = parport_read_status(qcam->pport);
+	for (i=0; i<250; i++) 
+	{
+		udelay(1000);
+		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);
+	udelay(1000);
+	parport_write_control(qcam->pport, 0xc);
+	udelay(1000);          
+}
+
+/* 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.  */
+	qcam_set(q, 17, q->height);
+
+	/* Set the width.  */
+	qcam_set(q, 19, q->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;
+			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);
+			buf[bytes++] = (lo1 | ((hi1 & 1)<<7));
+			buf[bytes++] = ((hi1 & 0x1e)<<3) | ((hi2 & 0x1e)>>1);
+			buf[bytes++] = (lo2 | ((hi2 & 1)<<7));
+		}
+	}
+	else
+	{
+		/* It's a unidirectional port */
+		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; cqcam gets this wrong */
+			buf[bytes++] = (hi | lo) ^ 0x88;
+		}
+	}
+	return bytes;
+}
+
+/* Convert the data the camera gives us into the desired output format. 
+   At the moment this is a no-op because read_bytes() does all the 
+   required stuff, for 24bpp at least.  */
+static size_t qcam_munge_buffer(struct qcam_device *q, char *inbuf, size_t inlen, char *outbuf, size_t outlen)
+{
+	size_t outptr = 0;
+	switch (q->bpp)
+	{
+	case 24:
+		while (inlen && (outptr <= (outlen-3)))
+		{
+			unsigned char r, g, b;
+			r = inbuf[0];
+			g = inbuf[1];
+			b = inbuf[2];
+			put_user(r, outbuf+(outptr++));
+			put_user(g, outbuf+(outptr++));
+			put_user(b, outbuf+(outptr++));
+			inlen -= 3;
+			inbuf += 3;
+		}
+		break;
+	default:
+		printk("c-qcam: can't convert this format (%d).\n", q->bpp);
+		return 0;
+	}
+	return outptr;
+}
+
+static long qc_capture(struct qcam_device *q, char *buf, unsigned long len)
+{
+	unsigned int tbpp = 0, tdecimation = 0, lines, pixelsperline, bitsperxfer;
+	unsigned int is_bi_dir = q->bidirectional;
+	size_t wantlen, outptr = 0;
+	char *tmpbuf = kmalloc(768, GFP_KERNEL);
+	if (tmpbuf == NULL)
+	{
+		printk(KERN_ERR "cqcam: couldn't allocate a buffer.\n");
+		return -ENOMEM;
+	}
+
+	/* Wait for camera to become ready */
+	for (;;)
+	{
+		int i = qcam_get(q, 41);
+		if (i == -1) {
+			qc_setup(q);
+			kfree(tmpbuf);
+			return -EIO;
+		}
+		if (i & 0x80)
+			schedule();
+		else
+			break;
+	}
+
+	switch (q->bpp) 
+	{
+	case 24: tbpp = QC_24BPP; break;
+	case 32: tbpp = QC_32BPP; break;
+	case 16: tbpp = QC_16BPP; break;
+	default: printk("qcam: Bad bpp.\n");
+	}
+	switch (q->transfer_scale) {
+	case 1: tdecimation = QC_1_1; break;
+	case 2: tdecimation = QC_2_1; break;
+	case 4: tdecimation = QC_4_1; break;
+	default: printk("qcam: Bad decimation.\n");
+	}
+	
+	qcam_set(q, 7, (tbpp | tdecimation) + ((is_bi_dir)?1:0) + 1);
+	
+	lines = q->height / q->transfer_scale;
+	pixelsperline = q->width / q->transfer_scale;
+	bitsperxfer = (is_bi_dir) ? 24 : 8;
+
+	if (is_bi_dir)
+	{
+		/* Turn the port around */
+		parport_frob_control(q->pport, 0x20, 0x20);
+		udelay(3000);
+		qcam_set_ack(q, 0);
+		if (qcam_await_ready1(q, 1)) {
+			kfree(tmpbuf);
+			qc_setup(q);
+			return -EIO;
+		}
+		qcam_set_ack(q, 1);
+		if (qcam_await_ready1(q, 0)) {
+			kfree(tmpbuf);
+			qc_setup(q);
+			return -EIO;
+		}
+	}
+
+	wantlen = lines * pixelsperline * q->bpp / 8;
+
+	while (wantlen)
+	{
+		size_t t, s, o;
+		s = (wantlen > 768)?768:wantlen;
+		t = qcam_read_bytes(q, tmpbuf, s);
+		if (outptr < len)
+		{
+			o = qcam_munge_buffer(q, tmpbuf, t, buf + outptr, 
+					      len - outptr);
+			outptr += o;
+		}
+		wantlen -= t;
+		if (t < s) 
+			break;
+		if (need_resched)
+			schedule();
+	}
+
+	len = outptr;
+
+	if (wantlen)
+	{
+		printk("qcam: short read.\n");
+		if (is_bi_dir)
+			parport_frob_control(q->pport, 0x20, 0);
+		qc_setup(q);
+		kfree(tmpbuf);
+		return len;
+	}
+
+	if (is_bi_dir)
+	{
+		int l;
+		do {
+			l = qcam_read_bytes(q, tmpbuf, 3);
+			if (need_resched)
+				schedule();
+		} while (l && (tmpbuf[0] == 0x7e || tmpbuf[1] == 0x7e || tmpbuf[2] == 0x7e));
+		if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
+			printk("qcam: bad EOF\n");
+		qcam_set_ack(q, 0);
+		if (qcam_await_ready1(q, 1))
+		{
+			printk("qcam: no ack after EOF\n");
+			parport_frob_control(q->pport, 0x20, 0);
+			qc_setup(q);
+			kfree(tmpbuf);
+			return len;
+		}
+		parport_frob_control(q->pport, 0x20, 0);
+		udelay(3000);
+		qcam_set_ack(q, 1);
+		if (qcam_await_ready1(q, 0))
+		{
+			printk("qcam: no ack to port turnaround\n");
+			qc_setup(q);
+			kfree(tmpbuf);
+			return len;
+		}
+	}
+	else
+	{
+		int l;
+		do {
+			l = qcam_read_bytes(q, tmpbuf, 1);
+			if (need_resched)
+				schedule();
+		} while (l && tmpbuf[0] == 0x7e);
+		l = qcam_read_bytes(q, tmpbuf+1, 2);
+		if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
+			printk("qcam: bad EOF\n");
+	}
+
+	kfree(tmpbuf);
+
+	qcam_write_data(q, 0);
+
+	return len;
+}
+
+/*
+ *	Video4linux interfacing
+ */
+
+static int qcam_open(struct video_device *dev, int flags)
+{
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static void qcam_close(struct video_device *dev)
+{
+	MOD_DEC_USE_COUNT;
+}
+
+static int qcam_init_done(struct video_device *dev)
+{
+	return 0;
+}
+
+static long qcam_write(struct video_device *v, const char *buf, unsigned long count, int noblock)
+{
+	return -EINVAL;
+}
+
+static int qcam_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+	struct qcam_device *qcam=(struct qcam_device *)dev;
+	
+	switch(cmd)
+	{
+		case VIDIOCGCAP:
+		{
+			struct video_capability b;
+			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;
+			if(copy_to_user(arg, &b,sizeof(b)))
+				return -EFAULT;
+			return 0;
+		}
+		case VIDIOCGCHAN:
+		{
+			struct video_channel v;
+			if(copy_from_user(&v, arg, sizeof(v)))
+				return -EFAULT;
+			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");
+			if(copy_to_user(arg, &v, sizeof(v)))
+				return -EFAULT;
+			return 0;
+		}
+		case VIDIOCSCHAN:
+		{
+			int v;
+			if(copy_from_user(&v, arg,sizeof(v)))
+				return -EFAULT;
+			if(v!=0)
+				return -EINVAL;
+			return 0;
+		}
+		case VIDIOCGTUNER:
+		{
+			struct video_tuner v;
+			if(copy_from_user(&v, arg, sizeof(v))!=0)
+				return -EFAULT;
+			if(v.tuner)
+				return -EINVAL;
+			strcpy(v.name, "Format");
+			v.rangelow=0;
+			v.rangehigh=0;
+			v.flags= 0;
+			v.mode = VIDEO_MODE_AUTO;
+			if(copy_to_user(arg,&v,sizeof(v))!=0)
+				return -EFAULT;
+			return 0;
+		}
+		case VIDIOCSTUNER:
+		{
+			struct video_tuner v;
+			if(copy_from_user(&v, arg, sizeof(v))!=0)
+				return -EFAULT;
+			if(v.tuner)
+				return -EINVAL;
+			if(v.mode!=VIDEO_MODE_AUTO)
+				return -EINVAL;
+			return 0;
+		}
+		case VIDIOCGPICT:
+		{
+			struct video_picture p;
+			p.colour=0x8000;
+			p.hue=0x8000;
+			p.brightness=qcam->brightness<<8;
+			p.contrast=qcam->contrast<<8;
+			p.whiteness=qcam->whitebal<<8;
+			p.depth=qcam->bpp;
+			p.palette=VIDEO_PALETTE_RGB24;
+			if(copy_to_user(arg, &p, sizeof(p)))
+				return -EFAULT;
+			return 0;
+		}
+		case VIDIOCSPICT:
+		{
+			struct video_picture p;
+			if(copy_from_user(&p, arg, sizeof(p)))
+				return -EFAULT;
+
+			if (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;
+			qcam->bpp = p.depth;
+			
+			parport_claim_or_block(qcam->pdev);
+			qc_setup(qcam); 
+			parport_release(qcam->pdev);
+			return 0;
+		}
+		case VIDIOCSWIN:
+		{
+			struct video_window vw;
+			if(copy_from_user(&vw, arg,sizeof(vw)))
+				return -EFAULT;
+			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 = 320;
+			qcam->height = 240;
+			qcam->transfer_scale = 4;
+			
+			if(vw.width>=160 && vw.height>=120)
+			{
+				qcam->transfer_scale = 2;
+			}
+			if(vw.width>=320 && vw.height>=240)
+			{
+				qcam->width = 320;
+				qcam->height = 240;
+				qcam->transfer_scale = 1;
+			}
+			/* Ok we figured out what to use from our wide choice */
+			parport_claim_or_block(qcam->pdev);
+			qc_setup(qcam);
+			parport_release(qcam->pdev);
+			return 0;
+		}
+		case VIDIOCGWIN:
+		{
+			struct video_window vw;
+			vw.x=0;
+			vw.y=0;
+			vw.width=qcam->width/qcam->transfer_scale;
+			vw.height=qcam->height/qcam->transfer_scale;
+			vw.chromakey=0;
+			vw.flags=0;
+			if(copy_to_user(arg, &vw, sizeof(vw)))
+				return -EFAULT;
+			return 0;
+		}
+		case VIDIOCCAPTURE:
+			return -EINVAL;
+		case VIDIOCGFBUF:
+			return -EINVAL;
+		case VIDIOCSFBUF:
+			return -EINVAL;
+		case VIDIOCKEY:
+			return 0;
+		case VIDIOCGFREQ:
+			return -EINVAL;
+		case VIDIOCSFREQ:
+			return -EINVAL;
+		case VIDIOCGAUDIO:
+			return -EINVAL;
+		case VIDIOCSAUDIO:
+			return -EINVAL;
+		default:
+			return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+static long qcam_read(struct video_device *v, char *buf, unsigned long count,  int noblock)
+{
+	struct qcam_device *qcam=(struct qcam_device *)v;
+	int len;
+	parport_claim_or_block(qcam->pdev);
+	/* Probably should have a semaphore against multiple users */
+	len = qc_capture(qcam, buf,count); 
+	parport_release(qcam->pdev);
+	return len;
+}
+
+/* video device template */
+static struct video_device qcam_template=
+{
+	"Colour Quickcam",
+	VID_TYPE_CAPTURE,
+	VID_HARDWARE_QCAM_C,
+	qcam_open,
+	qcam_close,
+	qcam_read,
+	qcam_write,
+	qcam_ioctl,
+	NULL,
+	qcam_init_done,
+	NULL,
+	0,
+	0
+};
+
+/* 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);
+
+	q->pport = port;
+	q->pdev = parport_register_device(port, "c-qcam", NULL, NULL,
+					  NULL, 0, NULL);
+
+	q->bidirectional = (q->pport->modes & PARPORT_MODE_PCPS2)?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));
+
+	q->width = 320;
+	q->height = 240;
+	q->bpp = 32;
+	q->transfer_scale = 1;
+	q->contrast = 192;
+	q->brightness = 240;
+	q->whitebal = 128;
+	q->top = 1;
+	q->left = 14;
+	return q;
+}
+
+#define MAX_CAMS 4
+static struct qcam_device *qcams[MAX_CAMS];
+static unsigned int num_cams = 0;
+
+int init_cqcam(struct parport *port)
+{
+	struct qcam_device *qcam;
+
+	if (num_cams == MAX_CAMS)
+	{
+		printk(KERN_ERR "Too many Quickcams (max %d)\n", MAX_CAMS);
+		return -ENOSPC;
+	}
+
+	qcam = qcam_init(port);
+	if (qcam==NULL)
+		return -ENODEV;
+		
+	parport_claim_or_block(qcam->pdev);
+
+	qc_reset(qcam);
+	
+	if (qc_detect(qcam)==0)
+	{
+		parport_release(qcam->pdev);
+		parport_unregister_device(qcam->pdev);
+		kfree(qcam);
+		return -ENODEV;
+	}
+
+	qc_setup(qcam);
+
+	parport_release(qcam->pdev);
+	
+	printk(KERN_INFO "Connectix Colour Quickcam on %s\n", 
+	       qcam->pport->name);
+	
+	if (video_register_device(&qcam->vdev)==-1)
+	{
+		parport_unregister_device(qcam->pdev);
+		kfree(qcam);
+		return -ENODEV;
+	}
+
+	qcams[num_cams++] = qcam;
+
+	return 0;
+}
+
+void close_cqcam(struct qcam_device *qcam)
+{
+	video_unregister_device(&qcam->vdev);
+	parport_unregister_device(qcam->pdev);
+	kfree(qcam);
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	struct parport *port;
+
+	for (port = parport_enumerate(); port; port=port->next)
+		init_cqcam(port);
+
+	return (num_cams)?0:-ENODEV;
+}
+
+void cleanup_module(void)
+{
+	unsigned int i;
+	for (i = 0; i < num_cams; i++)
+		close_cqcam(qcams[i]);
+}
+#else
+__initfunc(int init_colour_qcams(struct video_init *unused))
+{
+	struct parport *port;
+
+	for (port = parport_enumerate(); port; port=port->next)
+		init_cqcam(port);
+}
+#endif