diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/media/video/c-qcam.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/media/video/c-qcam.c')
-rw-r--r-- | drivers/media/video/c-qcam.c | 855 |
1 files changed, 855 insertions, 0 deletions
diff --git a/drivers/media/video/c-qcam.c b/drivers/media/video/c-qcam.c new file mode 100644 index 000000000000..75442ec49f35 --- /dev/null +++ b/drivers/media/video/c-qcam.c @@ -0,0 +1,855 @@ +/* + * 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); |