/* * 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 <linux/mutex.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 mutex 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; mutex_lock(&qcam->lock); parport_claim_or_block(qcam->pdev); qc_setup(qcam); parport_release(qcam->pdev); mutex_unlock(&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 */ mutex_lock(&qcam->lock); parport_claim_or_block(qcam->pdev); qc_setup(qcam); parport_release(qcam->pdev); mutex_unlock(&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; mutex_lock(&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); mutex_unlock(&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, .compat_ioctl = v4l_compat_ioctl32, .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)); mutex_init(&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);