- 根目录:
- drivers
- media
- video
- c-qcam.c
/*
* 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/mutex.h>
#include <linux/jiffies.h>
#include <linux/version.h>
#include <linux/videodev2.h>
#include <asm/uaccess.h>
#include <media/v4l2-device.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
struct qcam {
struct v4l2_device v4l2_dev;
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 v0.06"
static int parport[MAX_CAMS] = { [1 ... MAX_CAMS-1] = -1 };
static int probe = 2;
static int force_rgb;
static int video_nr = -1;
/* 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);
static struct qcam *qcams[MAX_CAMS];
static unsigned int num_cams;
static inline void qcam_set_ack(struct qcam *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 *qcam)
{
return (parport_read_status(qcam->pport) & 0x8) ? 1 : 0;
}
static inline unsigned int qcam_ready2(struct qcam *qcam)
{
return (parport_read_data(qcam->pport) & 0x1) ? 1 : 0;
}
static unsigned int qcam_await_ready1(struct qcam *qcam, int value)
{
struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
unsigned long oldjiffies = jiffies;
unsigned int i;
for (oldjiffies = jiffies;
time_before(jiffies, oldjiffies + msecs_to_jiffies(40));)
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. */
v4l2_err(v4l2_dev, "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 *qcam, int value)
{
struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
unsigned long oldjiffies = jiffies;
unsigned int i;
for (oldjiffies = jiffies;
time_before(jiffies, oldjiffies + msecs_to_jiffies(40));)
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. */
v4l2_err(v4l2_dev, "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 *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 *qcam, unsigned int data)
{
struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
unsigned int idata;
parport_write_data(qcam->pport, data);
idata = qcam_read_data(qcam);
if (data != idata) {
v4l2_warn(v4l2_dev, "sent %x but received %x\n", data,
idata);
return 1;
}
return 0;
}
static inline int qcam_set(struct qcam *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 *qcam, unsigned int cmd)
{
if (qcam_write_data(qcam, cmd))
return -1;
return qcam_read_data(qcam);
}
static int qc_detect(struct qcam *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 *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 *qcam)
{
qc_reset(qcam);
/* Set the brightness. */
qcam_set(qcam, 11, qcam->brightness);
/* Set the height and width. These refer to the actual
CCD area *before* applying the selected decimation. */
qcam_set(qcam, 17, qcam->ccd_height);
qcam_set(qcam, 19, qcam->ccd_width / 2);
/* Set top and left. */
qcam_set(qcam, 0xd, qcam->top);
qcam_set(qcam, 0xf, qcam->left);
/* Set contrast and white balance. */
qcam_set(qcam, 0x19, qcam->contrast);
qcam_set(qcam, 0x1f, qcam->whitebal);
/* Set the speed. */
qcam_set(qcam, 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 *qcam, unsigned char *buf, unsigned int nbytes)
{
unsigned int bytes = 0;
qcam_set_ack(qcam, 0);
if (qcam->bidirectional) {
/* It's a bidirectional port */
while (bytes < nbytes) {
unsigned int lo1, hi1, lo2, hi2;
unsigned char r, g, b;
if (qcam_await_ready2(qcam, 1))
return bytes;
lo1 = parport_read_data(qcam->pport) >> 1;
hi1 = ((parport_read_status(qcam->pport) >> 3) & 0x1f) ^ 0x10;
qcam_set_ack(qcam, 1);
if (qcam_await_ready2(qcam, 0))
return bytes;
lo2 = parport_read_data(qcam->pport) >> 1;
hi2 = ((parport_read_status(qcam->pport) >> 3) & 0x1f) ^ 0x10;
qcam_set_ack(qcam, 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(qcam, 1))
return bytes;
hi = (parport_read_status(qcam->pport) & 0xf0);
qcam_set_ack(qcam, 1);
if (qcam_await_ready1(qcam, 0))
return bytes;
lo = (parport_read_status(qcam->pport) & 0xf0);
qcam_set_ack(qcam, 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 *qcam, char __user *buf, unsigned long len)
{
struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
unsigned lines, pixelsperline, bitsperxfer;
unsigned int is_bi_dir = qcam->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(qcam, 41);
if (i == -1) {
qc_setup(qcam);
return -EIO;
}
if ((i & 0x80) == 0)
break;
schedule();
}
if (qcam_set(qcam, 7, (qcam->mode | (is_bi_dir ? 1 : 0)) + 1))
return -EIO;
lines = qcam->height;
pixelsperline = qcam->width;
bitsperxfer = (is_bi_dir) ? 24 : 8;
if (is_bi_dir) {
/* Turn the port around */
parport_data_reverse(qcam->pport);
mdelay(3);
qcam_set_ack(qcam, 0);
if (qcam_await_ready1(qcam, 1)) {
qc_setup(qcam);
return -EIO;
}
qcam_set_ack(qcam, 1);
if (qcam_await_ready1(qcam, 0)) {
qc_setup(qcam);
return -EIO;
}
}
wantlen = lines * pixelsperline * 24 / 8;
while (wantlen) {
size_t t, s;
s = (wantlen > BUFSZ) ? BUFSZ : wantlen;
t = qcam_read_bytes(qcam, 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) {
v4l2_err(v4l2_dev, "short read.\n");
if (is_bi_dir)
parport_data_forward(qcam->pport);
qc_setup(qcam);
return len;
}
if (is_bi_dir) {
int l;
do {
l = qcam_read_bytes(qcam, 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)
v4l2_err(v4l2_dev, "bad EOF\n");
} else {
if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
v4l2_err(v4l2_dev, "bad EOF\n");
}
qcam_set_ack(qcam, 0);
if (qcam_await_ready1(qcam, 1)) {
v4l2_err(v4l2_dev, "no ack after EOF\n");
parport_data_forward(qcam->pport);
qc_setup(qcam);
return len;
}
parport_data_forward(qcam->pport);
mdelay(3);
qcam_set_ack(qcam, 1);
if (qcam_await_ready1(qcam, 0)) {
v4l2_err(v4l2_dev, "no ack to port turnaround\n");
qc_setup(qcam);
return len;
}
} else {
int l;
do {
l = qcam_read_bytes(qcam, tmpbuf, 1);
cond_resched();
} while (l && tmpbuf[0] == 0x7e);
l = qcam_read_bytes(qcam, tmpbuf + 1, 2);
if (force_rgb) {
if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
v4l2_err(v4l2_dev, "bad EOF\n");
} else {
if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
v4l2_err(v4l2_dev, "bad EOF\n");
}
}
qcam_write_data(qcam, 0);
return len;
}
/*
* Video4linux interfacing
*/
static int qcam_querycap(struct file *file, void *priv,
struct v4l2_capability *vcap)
{
struct qcam *qcam = video_drvdata(file);
strlcpy(vcap->driver, qcam->v4l2_dev.name, sizeof(vcap->driver));
strlcpy(vcap->card, "Color Quickcam", sizeof(vcap->card));
strlcpy(vcap->bus_info, "parport", sizeof(vcap->bus_info));
vcap->version = KERNEL_VERSION(0, 0, 3);
vcap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
return 0;
}
static int qcam_enum_input(struct file *file, void *fh, struct v4l2_input *vin)
{
if (vin->index > 0)
return -EINVAL;
strlcpy(vin->name, "Camera", sizeof(vin->name));
vin->type = V4L2_INPUT_TYPE_CAMERA;
vin->audioset = 0;
vin->tuner = 0;
vin->std = 0;
vin->status = 0;
return 0;
}
static int qcam_g_input(struct file *file, void *fh, unsigned int *inp)
{
*inp = 0;
return 0;
}
static int qcam_s_input(struct file *file, void *fh, unsigned int inp)
{
return (inp > 0) ? -EINVAL : 0;
}
static int qcam_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
switch (qc->id) {
case V4L2_CID_BRIGHTNESS:
return v4l2_ctrl_query_fill(qc, 0, 255, 1, 240);
case V4L2_CID_CONTRAST:
return v4l2_ctrl_query_fill(qc, 0, 255, 1, 192);
case V4L2_CID_GAMMA:
return v4l2_ctrl_query_fill(qc, 0, 255, 1, 128);
}
return -EINVAL;
}
static int qcam_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct qcam *qcam = video_drvdata(file);
int ret = 0;
switch (ctrl->id) {
case V4L2_CID_BRIGHTNESS:
ctrl->value = qcam->brightness;
break;
case V4L2_CID_CONTRAST:
ctrl->value = qcam->contrast;
break;
case V4L2_CID_GAMMA:
ctrl->value = qcam->whitebal;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int qcam_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct qcam *qcam = video_drvdata(file);
int ret = 0;
mutex_lock(&qcam->lock);
switch (ctrl->id) {
case V4L2_CID_BRIGHTNESS:
qcam->brightness = ctrl->value;
break;
case V4L2_CID_CONTRAST:
qcam->contrast = ctrl->value;
break;
case V4L2_CID_GAMMA:
qcam->whitebal = ctrl->value;
break;
default:
ret = -EINVAL;
break;
}
if (ret == 0) {
parport_claim_or_block(qcam->pdev);
qc_setup(qcam);
parport_release(qcam->pdev);
}
mutex_unlock(&qcam->lock);
return ret;
}
static int qcam_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
{
struct qcam *qcam = video_drvdata(file);
struct v4l2_pix_format *pix = &fmt->fmt.pix;
pix->width = qcam->width;
pix->height = qcam->height;
pix->pixelformat = V4L2_PIX_FMT_RGB24;
pix->field = V4L2_FIELD_NONE;
pix->bytesperline = 3 * qcam->width;
pix->sizeimage = 3 * qcam->width * qcam->height;
/* Just a guess */
pix->colorspace = V4L2_COLORSPACE_SRGB;
return 0;
}
static int qcam_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
{
struct v4l2_pix_format *pix = &fmt->fmt.pix;
if (pix->height < 60 || pix->width < 80) {
pix->height = 60;
pix->width = 80;
} else if (pix->height < 120 || pix->width < 160) {
pix->height = 120;
pix->width = 160;
} else {
pix->height = 240;
pix->width = 320;
}
pix->pixelformat = V4L2_PIX_FMT_RGB24;
pix->field = V4L2_FIELD_NONE;
pix->bytesperline = 3 * pix->width;
pix->sizeimage = 3 * pix->width * pix->height;
/* Just a guess */
pix->colorspace = V4L2_COLORSPACE_SRGB;
return 0;
}
static int qcam_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
{
struct qcam *qcam = video_drvdata(file);
struct v4l2_pix_format *pix = &fmt->fmt.pix;
int ret = qcam_try_fmt_vid_cap(file, fh, fmt);
if (ret)
return ret;
switch (pix->height) {
case 60:
qcam->mode = QC_DECIMATION_4;
break;
case 120:
qcam->mode = QC_DECIMATION_2;
break;
default:
qcam->mode = QC_DECIMATION_1;
break;
}
mutex_lock(&qcam->lock);
qcam->mode |= QC_MILLIONS;
qcam->height = pix->height;
qcam->width = pix->width;
parport_claim_or_block(qcam->pdev);
qc_setup(qcam);
parport_release(qcam->pdev);
mutex_unlock(&qcam->lock);
return 0;
}
static int qcam_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *fmt)
{
static struct v4l2_fmtdesc formats[] = {
{ 0, 0, 0,
"RGB 8:8:8", V4L2_PIX_FMT_RGB24,
{ 0, 0, 0, 0 }
},
};
enum v4l2_buf_type type = fmt->type;
if (fmt->index > 0)
return -EINVAL;
*fmt = formats[fmt->index];
fmt->type = type;
return 0;
}
static ssize_t qcam_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct qcam *qcam = video_drvdata(file);
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;
}
static const struct v4l2_file_operations qcam_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.read = qcam_read,
};
static const struct v4l2_ioctl_ops qcam_ioctl_ops = {
.vidioc_querycap = qcam_querycap,
.vidioc_g_input = qcam_g_input,
.vidioc_s_input = qcam_s_input,
.vidioc_enum_input = qcam_enum_input,
.vidioc_queryctrl = qcam_queryctrl,
.vidioc_g_ctrl = qcam_g_ctrl,
.vidioc_s_ctrl = qcam_s_ctrl,
.vidioc_enum_fmt_vid_cap = qcam_enum_fmt_vid_cap,
.vidioc_g_fmt_vid_cap = qcam_g_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = qcam_s_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = qcam_try_fmt_vid_cap,
};
/* Initialize the QuickCam driver control structure. */
static struct qcam *qcam_init(struct parport *port)
{
struct qcam *qcam;
struct v4l2_device *v4l2_dev;
qcam = kzalloc(sizeof(*qcam), GFP_KERNEL);
if (qcam == NULL)
return NULL;
v4l2_dev = &qcam->v4l2_dev;
strlcpy(v4l2_dev->name, "c-qcam", sizeof(v4l2_dev->name));
if (v4l2_device_register(NULL, v4l2_dev) < 0) {
v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
return NULL;
}
qcam->pport = port;
qcam->pdev = parport_register_device(port, "c-qcam", NULL, NULL,
NULL, 0, NULL);
qcam->bidirectional = (qcam->pport->modes & PARPORT_MODE_TRISTATE) ? 1 : 0;
if (qcam->pdev == NULL) {
v4l2_err(v4l2_dev, "couldn't register for %s.\n", port->name);
kfree(qcam);
return NULL;
}
strlcpy(qcam->vdev.name, "Colour QuickCam", sizeof(qcam->vdev.name));
qcam->vdev.v4l2_dev = v4l2_dev;
qcam->vdev.fops = &qcam_fops;
qcam->vdev.ioctl_ops = &qcam_ioctl_ops;
qcam->vdev.release = video_device_release_empty;
video_set_drvdata(&qcam->vdev, qcam);
mutex_init(&qcam->lock);
qcam->width = qcam->ccd_width = 320;
qcam->height = qcam->ccd_height = 240;
qcam->mode = QC_MILLIONS | QC_DECIMATION_1;
qcam->contrast = 192;
qcam->brightness = 240;
qcam->whitebal = 128;
qcam->top = 1;
qcam->left = 14;
return qcam;
}
static int init_cqcam(struct parport *port)
{
struct qcam *qcam;
struct v4l2_device *v4l2_dev;
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;
v4l2_dev = &qcam->v4l2_dev;
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) < 0) {
v4l2_err(v4l2_dev, "Unable to register Colour QuickCam on %s\n",
qcam->pport->name);
parport_unregister_device(qcam->pdev);
kfree(qcam);
return -ENODEV;
}
v4l2_info(v4l2_dev, "%s: Colour QuickCam found on %s\n",
video_device_node_name(&qcam->vdev), qcam->pport->name);
qcams[num_cams++] = qcam;
return 0;
}
static void close_cqcam(struct qcam *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(KERN_INFO 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_init(cqcam_init);
module_exit(cqcam_cleanup);