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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [media/] [video/] [c-qcam.c] - Blame information for rev 1774

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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/version.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;
                current->state=TASK_INTERRUPTIBLE;
                schedule_timeout(HZ/10);
        }
 
        /* 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;
                current->state=TASK_INTERRUPTIBLE;
                schedule_timeout(HZ/10);
        }
 
        /* 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 *buf, unsigned long len)
{
        unsigned lines, pixelsperline, bitsperxfer;
        unsigned int is_bi_dir = q->bidirectional;
        size_t wantlen, outptr = 0;
        char tmpbuf[BUFSZ];
 
        if (verify_area(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;
                if (current->need_resched)
                        schedule();
        }
 
        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);
                        if (current->need_resched)
                                schedule();
                } 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);
                        if (current->need_resched)
                                schedule();
                } 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_open(struct video_device *dev, int flags)
{
        return 0;
}
 
static void qcam_close(struct video_device *dev)
{
}
 
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=24;
                        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;
 
                        /*
                         *      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;
 
                        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 = 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;
                        memset(&vw, 0, sizeof(vw));
                        vw.width=qcam->width;
                        vw.height=qcam->height;
                        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;
 
        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 video_device qcam_template=
{
        owner:          THIS_MODULE,
        name:           "Colour QuickCam",
        type:           VID_TYPE_CAPTURE,
        hardware:       VID_HARDWARE_QCAM_C,
        open:           qcam_open,
        close:          qcam_close,
        read:           qcam_read,
        write:          qcam_write,
        ioctl:          qcam_ioctl,
};
 
/* 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;
 
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;
}
 
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 = {
        "cqcam",
        cq_attach,
        cq_detach,
        NULL
};
 
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");
 
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_PARM(parport, "1-" __MODULE_STRING(MAX_CAMS) "i");
MODULE_PARM(probe, "i");
MODULE_PARM(force_rgb, "i");
MODULE_PARM(video_nr,"i");
 
module_init(cqcam_init);
module_exit(cqcam_cleanup);
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [media/] [video/] [c-qcam.c] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* Video4Linux Colour QuickCam driver`
3			`* Copyright 1997-2000 Philip Blundell <philb@gnu.org>`
4			`*`
5			`* Module parameters:`
6			`*`
7			`* parport=auto -- probe all parports (default)`
8			`* parport=0 -- parport0 becomes qcam1`
9			`* parport=2,0,1 -- parports 2,0,1 are tried in that order`
10			`*`
11			`* probe=0 -- do no probing, assume camera is present`
12			`* probe=1 -- use IEEE-1284 autoprobe data only (default)`
13			`* probe=2 -- probe aggressively for cameras`
14			`*`
15			`* force_rgb=1 -- force data format to RGB (default is BGR)`
16			`*`
17			`* The parport parameter controls which parports will be scanned.`
18			`* Scanning all parports causes some printers to print a garbage page.`
19			`* -- March 14, 1999 Billy Donahue <billy@escape.com>`
20			`*`
21			`* Fixed data format to BGR, added force_rgb parameter. Added missing`
22			`* parport_unregister_driver() on module removal.`
23			`* -- May 28, 2000 Claudio Matsuoka <claudio@conectiva.com>`
24			`*/`
25
26			`#include <linux/module.h>`
27			`#include <linux/delay.h>`
28			`#include <linux/errno.h>`
29			`#include <linux/fs.h>`
30			`#include <linux/init.h>`
31			`#include <linux/kernel.h>`
32			`#include <linux/slab.h>`
33			`#include <linux/mm.h>`
34			`#include <linux/parport.h>`
35			`#include <linux/sched.h>`
36			`#include <linux/version.h>`
37			`#include <linux/videodev.h>`
38			`#include <asm/semaphore.h>`
39			`#include <asm/uaccess.h>`
40