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linux/drivers/media/video/videodev.c
Jonathan Corbet 83427ac5d6 V4L/DVB (4743): Fix oops in VIDIOC_G_PARM 
The call to v4l2_std_construct() in the VIDIOC_G_PARM handler treats
vfd->current_norm as if it were an index - but it's not.  The result is
an oops if the driver has no vidioc_g_parm() method defined.  Here's the
fix.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2006-10-14 00:44:20 -03:00

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/*
* Video capture interface for Linux version 2
*
* A generic video device interface for the LINUX operating system
* using a set of device structures/vectors for low level operations.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alan Cox, <alan@redhat.com> (version 1)
* Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
*
* Fixes: 20000516 Claudio Matsuoka <claudio@conectiva.com>
* - Added procfs support
*/
#define dbgarg(cmd, fmt, arg...) \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) { \
printk (KERN_DEBUG "%s: ", vfd->name); \
v4l_printk_ioctl(cmd); \
printk (KERN_DEBUG "%s: " fmt, vfd->name, ## arg); \
}
#define dbgarg2(fmt, arg...) \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) \
printk (KERN_DEBUG "%s: " fmt, vfd->name, ## arg);
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#define __OLD_VIDIOC_ /* To allow fixing old calls*/
#include <linux/videodev2.h>
#ifdef CONFIG_VIDEO_V4L1
#include <linux/videodev.h>
#endif
#include <media/v4l2-common.h>
#define VIDEO_NUM_DEVICES 256
#define VIDEO_NAME "video4linux"
/*
* sysfs stuff
*/
static ssize_t show_name(struct class_device *cd, char *buf)
{
struct video_device *vfd = container_of(cd, struct video_device,
class_dev);
return sprintf(buf,"%.*s\n",(int)sizeof(vfd->name),vfd->name);
}
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
struct video_device *video_device_alloc(void)
{
struct video_device *vfd;
vfd = kzalloc(sizeof(*vfd),GFP_KERNEL);
return vfd;
}
void video_device_release(struct video_device *vfd)
{
kfree(vfd);
}
static void video_release(struct class_device *cd)
{
struct video_device *vfd = container_of(cd, struct video_device,
class_dev);
#if 1
/* needed until all drivers are fixed */
if (!vfd->release)
return;
#endif
vfd->release(vfd);
}
static struct class video_class = {
.name = VIDEO_NAME,
.release = video_release,
};
/*
* Active devices
*/
static struct video_device *video_device[VIDEO_NUM_DEVICES];
static DEFINE_MUTEX(videodev_lock);
struct video_device* video_devdata(struct file *file)
{
return video_device[iminor(file->f_dentry->d_inode)];
}
/*
* Open a video device - FIXME: Obsoleted
*/
static int video_open(struct inode *inode, struct file *file)
{
unsigned int minor = iminor(inode);
int err = 0;
struct video_device *vfl;
const struct file_operations *old_fops;
if(minor>=VIDEO_NUM_DEVICES)
return -ENODEV;
mutex_lock(&videodev_lock);
vfl=video_device[minor];
if(vfl==NULL) {
mutex_unlock(&videodev_lock);
request_module("char-major-%d-%d", VIDEO_MAJOR, minor);
mutex_lock(&videodev_lock);
vfl=video_device[minor];
if (vfl==NULL) {
mutex_unlock(&videodev_lock);
return -ENODEV;
}
}
old_fops = file->f_op;
file->f_op = fops_get(vfl->fops);
if(file->f_op->open)
err = file->f_op->open(inode,file);
if (err) {
fops_put(file->f_op);
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
mutex_unlock(&videodev_lock);
return err;
}
/*
* helper function -- handles userspace copying for ioctl arguments
*/
#ifdef __OLD_VIDIOC_
static unsigned int
video_fix_command(unsigned int cmd)
{
switch (cmd) {
case VIDIOC_OVERLAY_OLD:
cmd = VIDIOC_OVERLAY;
break;
case VIDIOC_S_PARM_OLD:
cmd = VIDIOC_S_PARM;
break;
case VIDIOC_S_CTRL_OLD:
cmd = VIDIOC_S_CTRL;
break;
case VIDIOC_G_AUDIO_OLD:
cmd = VIDIOC_G_AUDIO;
break;
case VIDIOC_G_AUDOUT_OLD:
cmd = VIDIOC_G_AUDOUT;
break;
case VIDIOC_CROPCAP_OLD:
cmd = VIDIOC_CROPCAP;
break;
}
return cmd;
}
#endif
/*
* Obsolete usercopy function - Should be removed soon
*/
int
video_usercopy(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg,
int (*func)(struct inode *inode, struct file *file,
unsigned int cmd, void *arg))
{
char sbuf[128];
void *mbuf = NULL;
void *parg = NULL;
int err = -EINVAL;
int is_ext_ctrl;
size_t ctrls_size = 0;
void __user *user_ptr = NULL;
#ifdef __OLD_VIDIOC_
cmd = video_fix_command(cmd);
#endif
is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
cmd == VIDIOC_TRY_EXT_CTRLS);
/* Copy arguments into temp kernel buffer */
switch (_IOC_DIR(cmd)) {
case _IOC_NONE:
parg = NULL;
break;
case _IOC_READ:
case _IOC_WRITE:
case (_IOC_WRITE | _IOC_READ):
if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
parg = sbuf;
} else {
/* too big to allocate from stack */
mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
if (NULL == mbuf)
return -ENOMEM;
parg = mbuf;
}
err = -EFAULT;
if (_IOC_DIR(cmd) & _IOC_WRITE)
if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
goto out;
break;
}
if (is_ext_ctrl) {
struct v4l2_ext_controls *p = parg;
/* In case of an error, tell the caller that it wasn't
a specific control that caused it. */
p->error_idx = p->count;
user_ptr = (void __user *)p->controls;
if (p->count) {
ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
/* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
mbuf = kmalloc(ctrls_size, GFP_KERNEL);
err = -ENOMEM;
if (NULL == mbuf)
goto out_ext_ctrl;
err = -EFAULT;
if (copy_from_user(mbuf, user_ptr, ctrls_size))
goto out_ext_ctrl;
p->controls = mbuf;
}
}
/* call driver */
err = func(inode, file, cmd, parg);
if (err == -ENOIOCTLCMD)
err = -EINVAL;
if (is_ext_ctrl) {
struct v4l2_ext_controls *p = parg;
p->controls = (void *)user_ptr;
if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
err = -EFAULT;
goto out_ext_ctrl;
}
if (err < 0)
goto out;
out_ext_ctrl:
/* Copy results into user buffer */
switch (_IOC_DIR(cmd))
{
case _IOC_READ:
case (_IOC_WRITE | _IOC_READ):
if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
err = -EFAULT;
break;
}
out:
kfree(mbuf);
return err;
}
/*
* open/release helper functions -- handle exclusive opens
* Should be removed soon
*/
int video_exclusive_open(struct inode *inode, struct file *file)
{
struct video_device *vfl = video_devdata(file);
int retval = 0;
mutex_lock(&vfl->lock);
if (vfl->users) {
retval = -EBUSY;
} else {
vfl->users++;
}
mutex_unlock(&vfl->lock);
return retval;
}
int video_exclusive_release(struct inode *inode, struct file *file)
{
struct video_device *vfl = video_devdata(file);
vfl->users--;
return 0;
}
static char *v4l2_memory_names[] = {
[V4L2_MEMORY_MMAP] = "mmap",
[V4L2_MEMORY_USERPTR] = "userptr",
[V4L2_MEMORY_OVERLAY] = "overlay",
};
/* FIXME: Those stuff are replicated also on v4l2-common.c */
static char *v4l2_type_names_FIXME[] = {
[V4L2_BUF_TYPE_VIDEO_CAPTURE] = "video-cap",
[V4L2_BUF_TYPE_VIDEO_OVERLAY] = "video-over",
[V4L2_BUF_TYPE_VIDEO_OUTPUT] = "video-out",
[V4L2_BUF_TYPE_VBI_CAPTURE] = "vbi-cap",
[V4L2_BUF_TYPE_VBI_OUTPUT] = "vbi-out",
[V4L2_BUF_TYPE_SLICED_VBI_OUTPUT] = "sliced-vbi-out",
[V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-capture",
[V4L2_BUF_TYPE_PRIVATE] = "private",
};
static char *v4l2_field_names_FIXME[] = {
[V4L2_FIELD_ANY] = "any",
[V4L2_FIELD_NONE] = "none",
[V4L2_FIELD_TOP] = "top",
[V4L2_FIELD_BOTTOM] = "bottom",
[V4L2_FIELD_INTERLACED] = "interlaced",
[V4L2_FIELD_SEQ_TB] = "seq-tb",
[V4L2_FIELD_SEQ_BT] = "seq-bt",
[V4L2_FIELD_ALTERNATE] = "alternate",
};
#define prt_names(a,arr) (((a)>=0)&&((a)<ARRAY_SIZE(arr)))?arr[a]:"unknown"
static void dbgbuf(unsigned int cmd, struct video_device *vfd,
struct v4l2_buffer *p)
{
struct v4l2_timecode *tc=&p->timecode;
dbgarg (cmd, "%02ld:%02d:%02d.%08ld index=%d, type=%s, "
"bytesused=%d, flags=0x%08d, "
"field=%0d, sequence=%d, memory=%s, offset/userptr=0x%08lx\n",
(p->timestamp.tv_sec/3600),
(int)(p->timestamp.tv_sec/60)%60,
(int)(p->timestamp.tv_sec%60),
p->timestamp.tv_usec,
p->index,
prt_names(p->type,v4l2_type_names_FIXME),
p->bytesused,p->flags,
p->field,p->sequence,
prt_names(p->memory,v4l2_memory_names),
p->m.userptr);
dbgarg2 ("timecode= %02d:%02d:%02d type=%d, "
"flags=0x%08d, frames=%d, userbits=0x%08x\n",
tc->hours,tc->minutes,tc->seconds,
tc->type, tc->flags, tc->frames, *(__u32 *) tc->userbits);
}
static inline void dbgrect(struct video_device *vfd, char *s,
struct v4l2_rect *r)
{
dbgarg2 ("%sRect start at %dx%d, size= %dx%d\n", s, r->left, r->top,
r->width, r->height);
};
static inline void v4l_print_pix_fmt (struct video_device *vfd,
struct v4l2_pix_format *fmt)
{
dbgarg2 ("width=%d, height=%d, format=0x%08x, field=%s, "
"bytesperline=%d sizeimage=%d, colorspace=%d\n",
fmt->width,fmt->height,fmt->pixelformat,
prt_names(fmt->field,v4l2_field_names_FIXME),
fmt->bytesperline,fmt->sizeimage,fmt->colorspace);
};
static int check_fmt (struct video_device *vfd, enum v4l2_buf_type type)
{
switch (type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (vfd->vidioc_try_fmt_cap)
return (0);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (vfd->vidioc_try_fmt_overlay)
return (0);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
if (vfd->vidioc_try_fmt_vbi)
return (0);
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
if (vfd->vidioc_try_fmt_vbi_output)
return (0);
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
if (vfd->vidioc_try_fmt_vbi_capture)
return (0);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (vfd->vidioc_try_fmt_video_output)
return (0);
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
if (vfd->vidioc_try_fmt_vbi_output)
return (0);
break;
case V4L2_BUF_TYPE_PRIVATE:
if (vfd->vidioc_try_fmt_type_private)
return (0);
break;
}
return (-EINVAL);
}
static int __video_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *vfd = video_devdata(file);
void *fh = file->private_data;
int ret = -EINVAL;
if ( (vfd->debug & V4L2_DEBUG_IOCTL) &&
!(vfd->debug | V4L2_DEBUG_IOCTL_ARG)) {
v4l_print_ioctl(vfd->name, cmd);
}
switch(cmd) {
/* --- capabilities ------------------------------------------ */
case VIDIOC_QUERYCAP:
{
struct v4l2_capability *cap = (struct v4l2_capability*)arg;
memset(cap, 0, sizeof(*cap));
if (!vfd->vidioc_querycap)
break;
ret=vfd->vidioc_querycap(file, fh, cap);
if (!ret)
dbgarg (cmd, "driver=%s, card=%s, bus=%s, "
"version=0x%08x, "
"capabilities=0x%08x\n",
cap->driver,cap->card,cap->bus_info,
cap->version,
cap->capabilities);
break;
}
/* --- priority ------------------------------------------ */
case VIDIOC_G_PRIORITY:
{
enum v4l2_priority *p=arg;
if (!vfd->vidioc_g_priority)
break;
ret=vfd->vidioc_g_priority(file, fh, p);
if (!ret)
dbgarg(cmd, "priority is %d\n", *p);
break;
}
case VIDIOC_S_PRIORITY:
{
enum v4l2_priority *p=arg;
if (!vfd->vidioc_s_priority)
break;
dbgarg(cmd, "setting priority to %d\n", *p);
ret=vfd->vidioc_s_priority(file, fh, *p);
break;
}
/* --- capture ioctls ---------------------------------------- */
case VIDIOC_ENUM_FMT:
{
struct v4l2_fmtdesc *f = arg;
enum v4l2_buf_type type;
unsigned int index;
index = f->index;
type = f->type;
memset(f,0,sizeof(*f));
f->index = index;
f->type = type;
switch (type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (vfd->vidioc_enum_fmt_cap)
ret=vfd->vidioc_enum_fmt_cap(file, fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (vfd->vidioc_enum_fmt_overlay)
ret=vfd->vidioc_enum_fmt_overlay(file, fh, f);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
if (vfd->vidioc_enum_fmt_vbi)
ret=vfd->vidioc_enum_fmt_vbi(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
if (vfd->vidioc_enum_fmt_vbi_output)
ret=vfd->vidioc_enum_fmt_vbi_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
if (vfd->vidioc_enum_fmt_vbi_capture)
ret=vfd->vidioc_enum_fmt_vbi_capture(file,
fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (vfd->vidioc_enum_fmt_video_output)
ret=vfd->vidioc_enum_fmt_video_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
if (vfd->vidioc_enum_fmt_vbi_output)
ret=vfd->vidioc_enum_fmt_vbi_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_PRIVATE:
if (vfd->vidioc_enum_fmt_type_private)
ret=vfd->vidioc_enum_fmt_type_private(file,
fh, f);
break;
}
if (!ret)
dbgarg (cmd, "index=%d, type=%d, flags=%d, "
"description=%s,"
" pixelformat=0x%8x\n",
f->index, f->type, f->flags,
f->description,
f->pixelformat);
break;
}
case VIDIOC_G_FMT:
{
struct v4l2_format *f = (struct v4l2_format *)arg;
enum v4l2_buf_type type=f->type;
memset(&f->fmt.pix,0,sizeof(f->fmt.pix));
f->type=type;
/* FIXME: Should be one dump per type */
dbgarg (cmd, "type=%s\n", prt_names(type,
v4l2_type_names_FIXME));
switch (type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (vfd->vidioc_g_fmt_cap)
ret=vfd->vidioc_g_fmt_cap(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd,&f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (vfd->vidioc_g_fmt_overlay)
ret=vfd->vidioc_g_fmt_overlay(file, fh, f);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
if (vfd->vidioc_g_fmt_vbi)
ret=vfd->vidioc_g_fmt_vbi(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
if (vfd->vidioc_g_fmt_vbi_output)
ret=vfd->vidioc_g_fmt_vbi_output(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
if (vfd->vidioc_g_fmt_vbi_capture)
ret=vfd->vidioc_g_fmt_vbi_capture(file, fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (vfd->vidioc_g_fmt_video_output)
ret=vfd->vidioc_g_fmt_video_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
if (vfd->vidioc_g_fmt_vbi_output)
ret=vfd->vidioc_g_fmt_vbi_output(file, fh, f);
break;
case V4L2_BUF_TYPE_PRIVATE:
if (vfd->vidioc_g_fmt_type_private)
ret=vfd->vidioc_g_fmt_type_private(file,
fh, f);
break;
}
break;
}
case VIDIOC_S_FMT:
{
struct v4l2_format *f = (struct v4l2_format *)arg;
/* FIXME: Should be one dump per type */
dbgarg (cmd, "type=%s\n", prt_names(f->type,
v4l2_type_names_FIXME));
switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
v4l_print_pix_fmt(vfd,&f->fmt.pix);
if (vfd->vidioc_s_fmt_cap)
ret=vfd->vidioc_s_fmt_cap(file, fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (vfd->vidioc_s_fmt_overlay)
ret=vfd->vidioc_s_fmt_overlay(file, fh, f);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
if (vfd->vidioc_s_fmt_vbi)
ret=vfd->vidioc_s_fmt_vbi(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
if (vfd->vidioc_s_fmt_vbi_output)
ret=vfd->vidioc_s_fmt_vbi_output(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
if (vfd->vidioc_s_fmt_vbi_capture)
ret=vfd->vidioc_s_fmt_vbi_capture(file, fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (vfd->vidioc_s_fmt_video_output)
ret=vfd->vidioc_s_fmt_video_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
if (vfd->vidioc_s_fmt_vbi_output)
ret=vfd->vidioc_s_fmt_vbi_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_PRIVATE:
if (vfd->vidioc_s_fmt_type_private)
ret=vfd->vidioc_s_fmt_type_private(file,
fh, f);
break;
}
break;
}
case VIDIOC_TRY_FMT:
{
struct v4l2_format *f = (struct v4l2_format *)arg;
/* FIXME: Should be one dump per type */
dbgarg (cmd, "type=%s\n", prt_names(f->type,
v4l2_type_names_FIXME));
switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (vfd->vidioc_try_fmt_cap)
ret=vfd->vidioc_try_fmt_cap(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd,&f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (vfd->vidioc_try_fmt_overlay)
ret=vfd->vidioc_try_fmt_overlay(file, fh, f);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
if (vfd->vidioc_try_fmt_vbi)
ret=vfd->vidioc_try_fmt_vbi(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
if (vfd->vidioc_try_fmt_vbi_output)
ret=vfd->vidioc_try_fmt_vbi_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
if (vfd->vidioc_try_fmt_vbi_capture)
ret=vfd->vidioc_try_fmt_vbi_capture(file,
fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (vfd->vidioc_try_fmt_video_output)
ret=vfd->vidioc_try_fmt_video_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
if (vfd->vidioc_try_fmt_vbi_output)
ret=vfd->vidioc_try_fmt_vbi_output(file,
fh, f);
break;
case V4L2_BUF_TYPE_PRIVATE:
if (vfd->vidioc_try_fmt_type_private)
ret=vfd->vidioc_try_fmt_type_private(file,
fh, f);
break;
}
break;
}
/* FIXME: Those buf reqs could be handled here,
with some changes on videobuf to allow its header to be included at
videodev2.h or being merged at videodev2.
*/
case VIDIOC_REQBUFS:
{
struct v4l2_requestbuffers *p=arg;
if (!vfd->vidioc_reqbufs)
break;
ret = check_fmt (vfd, p->type);
if (ret)
break;
ret=vfd->vidioc_reqbufs(file, fh, p);
dbgarg (cmd, "count=%d, type=%s, memory=%s\n",
p->count,
prt_names(p->type,v4l2_type_names_FIXME),
prt_names(p->memory,v4l2_memory_names));
break;
}
case VIDIOC_QUERYBUF:
{
struct v4l2_buffer *p=arg;
if (!vfd->vidioc_querybuf)
break;
ret = check_fmt (vfd, p->type);
if (ret)
break;
ret=vfd->vidioc_querybuf(file, fh, p);
if (!ret)
dbgbuf(cmd,vfd,p);
break;
}
case VIDIOC_QBUF:
{
struct v4l2_buffer *p=arg;
if (!vfd->vidioc_qbuf)
break;
ret = check_fmt (vfd, p->type);
if (ret)
break;
ret=vfd->vidioc_qbuf(file, fh, p);
if (!ret)
dbgbuf(cmd,vfd,p);
break;
}
case VIDIOC_DQBUF:
{
struct v4l2_buffer *p=arg;
if (!vfd->vidioc_dqbuf)
break;
ret = check_fmt (vfd, p->type);
if (ret)
break;
ret=vfd->vidioc_dqbuf(file, fh, p);
if (!ret)
dbgbuf(cmd,vfd,p);
break;
}
case VIDIOC_OVERLAY:
{
int *i = arg;
if (!vfd->vidioc_overlay)
break;
dbgarg (cmd, "value=%d\n",*i);
ret=vfd->vidioc_overlay(file, fh, *i);
break;
}
#ifdef CONFIG_VIDEO_V4L1_COMPAT
/* --- streaming capture ------------------------------------- */
case VIDIOCGMBUF:
{
struct video_mbuf *p=arg;
memset(p,0,sizeof(p));
if (!vfd->vidiocgmbuf)
break;
ret=vfd->vidiocgmbuf(file, fh, p);
if (!ret)
dbgarg (cmd, "size=%d, frames=%d, offsets=0x%08lx\n",
p->size, p->frames,
(unsigned long)p->offsets);
break;
}
#endif
case VIDIOC_G_FBUF:
{
struct v4l2_framebuffer *p=arg;
if (!vfd->vidioc_g_fbuf)
break;
ret=vfd->vidioc_g_fbuf(file, fh, arg);
if (!ret) {
dbgarg (cmd, "capability=%d, flags=%d, base=0x%08lx\n",
p->capability,p->flags,
(unsigned long)p->base);
v4l_print_pix_fmt (vfd, &p->fmt);
}
break;
}
case VIDIOC_S_FBUF:
{
struct v4l2_framebuffer *p=arg;
if (!vfd->vidioc_s_fbuf)
break;
dbgarg (cmd, "capability=%d, flags=%d, base=0x%08lx\n",
p->capability,p->flags,(unsigned long)p->base);
v4l_print_pix_fmt (vfd, &p->fmt);
ret=vfd->vidioc_s_fbuf(file, fh, arg);
break;
}
case VIDIOC_STREAMON:
{
enum v4l2_buf_type i = *(int *)arg;
if (!vfd->vidioc_streamon)
break;
dbgarg (cmd, "type=%s\n", prt_names(i,v4l2_type_names_FIXME));
ret=vfd->vidioc_streamon(file, fh,i);
break;
}
case VIDIOC_STREAMOFF:
{
enum v4l2_buf_type i = *(int *)arg;
if (!vfd->vidioc_streamoff)
break;
dbgarg (cmd, "type=%s\n", prt_names(i,v4l2_type_names_FIXME));
ret=vfd->vidioc_streamoff(file, fh, i);
break;
}
/* ---------- tv norms ---------- */
case VIDIOC_ENUMSTD:
{
struct v4l2_standard *p = arg;
unsigned int index = p->index;
if (!vfd->tvnormsize) {
printk (KERN_WARNING "%s: no TV norms defined!\n",
vfd->name);
break;
}
if (index<0 || index >= vfd->tvnormsize) {
ret=-EINVAL;
break;
}
v4l2_video_std_construct(p, vfd->tvnorms[p->index].id,
vfd->tvnorms[p->index].name);
p->index = index;
dbgarg (cmd, "index=%d, id=%Ld, name=%s, fps=%d/%d, "
"framelines=%d\n", p->index,
(unsigned long long)p->id, p->name,
p->frameperiod.numerator,
p->frameperiod.denominator,
p->framelines);
ret=0;
break;
}
case VIDIOC_G_STD:
{
v4l2_std_id *id = arg;
*id = vfd->current_norm;
dbgarg (cmd, "value=%Lu\n", (long long unsigned) *id);
ret=0;
break;
}
case VIDIOC_S_STD:
{
v4l2_std_id *id = arg;
unsigned int i;
if (!vfd->tvnormsize) {
printk (KERN_WARNING "%s: no TV norms defined!\n",
vfd->name);
break;
}
dbgarg (cmd, "value=%Lu\n", (long long unsigned) *id);
/* First search for exact match */
for (i = 0; i < vfd->tvnormsize; i++)
if (*id == vfd->tvnorms[i].id)
break;
/* Then for a generic video std that contains desired std */
if (i == vfd->tvnormsize)
for (i = 0; i < vfd->tvnormsize; i++)
if (*id & vfd->tvnorms[i].id)
break;
if (i == vfd->tvnormsize) {
break;
}
/* Calls the specific handler */
if (vfd->vidioc_s_std)
ret=vfd->vidioc_s_std(file, fh, i);
else
ret=-EINVAL;
/* Updates standard information */
if (!ret)
vfd->current_norm=*id;
break;
}
case VIDIOC_QUERYSTD:
{
v4l2_std_id *p=arg;
if (!vfd->vidioc_querystd)
break;
ret=vfd->vidioc_querystd(file, fh, arg);
if (!ret)
dbgarg (cmd, "detected std=%Lu\n",
(unsigned long long)*p);
break;
}
/* ------ input switching ---------- */
/* FIXME: Inputs can be handled inside videodev2 */
case VIDIOC_ENUMINPUT:
{
struct v4l2_input *p=arg;
int i=p->index;
if (!vfd->vidioc_enum_input)
break;
memset(p, 0, sizeof(*p));
p->index=i;
ret=vfd->vidioc_enum_input(file, fh, p);
if (!ret)
dbgarg (cmd, "index=%d, name=%s, type=%d, "
"audioset=%d, "
"tuner=%d, std=%Ld, status=%d\n",
p->index,p->name,p->type,p->audioset,
p->tuner,
(unsigned long long)p->std,
p->status);
break;
}
case VIDIOC_G_INPUT:
{
unsigned int *i = arg;
if (!vfd->vidioc_g_input)
break;
ret=vfd->vidioc_g_input(file, fh, i);
if (!ret)
dbgarg (cmd, "value=%d\n",*i);
break;
}
case VIDIOC_S_INPUT:
{
unsigned int *i = arg;
if (!vfd->vidioc_s_input)
break;
dbgarg (cmd, "value=%d\n",*i);
ret=vfd->vidioc_s_input(file, fh, *i);
break;
}
/* ------ output switching ---------- */
case VIDIOC_G_OUTPUT:
{
unsigned int *i = arg;
if (!vfd->vidioc_g_output)
break;
ret=vfd->vidioc_g_output(file, fh, i);
if (!ret)
dbgarg (cmd, "value=%d\n",*i);
break;
}
case VIDIOC_S_OUTPUT:
{
unsigned int *i = arg;
if (!vfd->vidioc_s_output)
break;
dbgarg (cmd, "value=%d\n",*i);
ret=vfd->vidioc_s_output(file, fh, *i);
break;
}
/* --- controls ---------------------------------------------- */
case VIDIOC_QUERYCTRL:
{
struct v4l2_queryctrl *p=arg;
if (!vfd->vidioc_queryctrl)
break;
ret=vfd->vidioc_queryctrl(file, fh, p);
if (!ret)
dbgarg (cmd, "id=%d, type=%d, name=%s, "
"min/max=%d/%d,"
" step=%d, default=%d, flags=0x%08x\n",
p->id,p->type,p->name,p->minimum,
p->maximum,p->step,p->default_value,
p->flags);
break;
}
case VIDIOC_G_CTRL:
{
struct v4l2_control *p = arg;
if (!vfd->vidioc_g_ctrl)
break;
dbgarg(cmd, "Enum for index=%d\n", p->id);
ret=vfd->vidioc_g_ctrl(file, fh, p);
if (!ret)
dbgarg2 ( "id=%d, value=%d\n", p->id, p->value);
break;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *p = arg;
if (!vfd->vidioc_s_ctrl)
break;
dbgarg (cmd, "id=%d, value=%d\n", p->id, p->value);
ret=vfd->vidioc_s_ctrl(file, fh, p);
break;
}
case VIDIOC_G_EXT_CTRLS:
{
struct v4l2_ext_controls *p = arg;
if (vfd->vidioc_g_ext_ctrls) {
dbgarg(cmd, "count=%d\n", p->count);
ret=vfd->vidioc_g_ext_ctrls(file, fh, p);
}
break;
}
case VIDIOC_S_EXT_CTRLS:
{
struct v4l2_ext_controls *p = arg;
if (vfd->vidioc_s_ext_ctrls) {
dbgarg(cmd, "count=%d\n", p->count);
ret=vfd->vidioc_s_ext_ctrls(file, fh, p);
}
break;
}
case VIDIOC_TRY_EXT_CTRLS:
{
struct v4l2_ext_controls *p = arg;
if (vfd->vidioc_try_ext_ctrls) {
dbgarg(cmd, "count=%d\n", p->count);
ret=vfd->vidioc_try_ext_ctrls(file, fh, p);
}
break;
}
case VIDIOC_QUERYMENU:
{
struct v4l2_querymenu *p=arg;
if (!vfd->vidioc_querymenu)
break;
ret=vfd->vidioc_querymenu(file, fh, p);
if (!ret)
dbgarg (cmd, "id=%d, index=%d, name=%s\n",
p->id,p->index,p->name);
break;
}
/* --- audio ---------------------------------------------- */
case VIDIOC_ENUMAUDIO:
{
struct v4l2_audio *p=arg;
if (!vfd->vidioc_enumaudio)
break;
dbgarg(cmd, "Enum for index=%d\n", p->index);
ret=vfd->vidioc_enumaudio(file, fh, p);
if (!ret)
dbgarg2("index=%d, name=%s, capability=%d, "
"mode=%d\n",p->index,p->name,
p->capability, p->mode);
break;
}
case VIDIOC_G_AUDIO:
{
struct v4l2_audio *p=arg;
if (!vfd->vidioc_g_audio)
break;
dbgarg(cmd, "Get for index=%d\n", p->index);
ret=vfd->vidioc_g_audio(file, fh, p);
if (!ret)
dbgarg2("index=%d, name=%s, capability=%d, "
"mode=%d\n",p->index,
p->name,p->capability, p->mode);
break;
}
case VIDIOC_S_AUDIO:
{
struct v4l2_audio *p=arg;
if (!vfd->vidioc_s_audio)
break;
dbgarg(cmd, "index=%d, name=%s, capability=%d, "
"mode=%d\n", p->index, p->name,
p->capability, p->mode);
ret=vfd->vidioc_s_audio(file, fh, p);
break;
}
case VIDIOC_ENUMAUDOUT:
{
struct v4l2_audioout *p=arg;
if (!vfd->vidioc_enumaudout)
break;
dbgarg(cmd, "Enum for index=%d\n", p->index);
ret=vfd->vidioc_enumaudout(file, fh, p);
if (!ret)
dbgarg2("index=%d, name=%s, capability=%d, "
"mode=%d\n", p->index, p->name,
p->capability,p->mode);
break;
}
case VIDIOC_G_AUDOUT:
{
struct v4l2_audioout *p=arg;
if (!vfd->vidioc_g_audout)
break;
dbgarg(cmd, "Enum for index=%d\n", p->index);
ret=vfd->vidioc_g_audout(file, fh, p);
if (!ret)
dbgarg2("index=%d, name=%s, capability=%d, "
"mode=%d\n", p->index, p->name,
p->capability,p->mode);
break;
}
case VIDIOC_S_AUDOUT:
{
struct v4l2_audioout *p=arg;
if (!vfd->vidioc_s_audout)
break;
dbgarg(cmd, "index=%d, name=%s, capability=%d, "
"mode=%d\n", p->index, p->name,
p->capability,p->mode);
ret=vfd->vidioc_s_audout(file, fh, p);
break;
}
case VIDIOC_G_MODULATOR:
{
struct v4l2_modulator *p=arg;
if (!vfd->vidioc_g_modulator)
break;
ret=vfd->vidioc_g_modulator(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, "
"capability=%d, rangelow=%d,"
" rangehigh=%d, txsubchans=%d\n",
p->index, p->name,p->capability,
p->rangelow, p->rangehigh,
p->txsubchans);
break;
}
case VIDIOC_S_MODULATOR:
{
struct v4l2_modulator *p=arg;
if (!vfd->vidioc_s_modulator)
break;
dbgarg(cmd, "index=%d, name=%s, capability=%d, "
"rangelow=%d, rangehigh=%d, txsubchans=%d\n",
p->index, p->name,p->capability,p->rangelow,
p->rangehigh,p->txsubchans);
ret=vfd->vidioc_s_modulator(file, fh, p);
break;
}
case VIDIOC_G_CROP:
{
struct v4l2_crop *p=arg;
if (!vfd->vidioc_g_crop)
break;
ret=vfd->vidioc_g_crop(file, fh, p);
if (!ret) {
dbgarg(cmd, "type=%d\n", p->type);
dbgrect(vfd, "", &p->c);
}
break;
}
case VIDIOC_S_CROP:
{
struct v4l2_crop *p=arg;
if (!vfd->vidioc_s_crop)
break;
dbgarg(cmd, "type=%d\n", p->type);
dbgrect(vfd, "", &p->c);
ret=vfd->vidioc_s_crop(file, fh, p);
break;
}
case VIDIOC_CROPCAP:
{
struct v4l2_cropcap *p=arg;
/*FIXME: Should also show v4l2_fract pixelaspect */
if (!vfd->vidioc_cropcap)
break;
dbgarg(cmd, "type=%d\n", p->type);
dbgrect(vfd, "bounds ", &p->bounds);
dbgrect(vfd, "defrect ", &p->defrect);
ret=vfd->vidioc_cropcap(file, fh, p);
break;
}
case VIDIOC_G_MPEGCOMP:
{
struct v4l2_mpeg_compression *p=arg;
/*FIXME: Several fields not shown */
if (!vfd->vidioc_g_mpegcomp)
break;
ret=vfd->vidioc_g_mpegcomp(file, fh, p);
if (!ret)
dbgarg (cmd, "ts_pid_pmt=%d, ts_pid_audio=%d,"
" ts_pid_video=%d, ts_pid_pcr=%d, "
"ps_size=%d, au_sample_rate=%d, "
"au_pesid=%c, vi_frame_rate=%d, "
"vi_frames_per_gop=%d, "
"vi_bframes_count=%d, vi_pesid=%c\n",
p->ts_pid_pmt,p->ts_pid_audio,
p->ts_pid_video,p->ts_pid_pcr,
p->ps_size, p->au_sample_rate,
p->au_pesid, p->vi_frame_rate,
p->vi_frames_per_gop,
p->vi_bframes_count, p->vi_pesid);
break;
}
case VIDIOC_S_MPEGCOMP:
{
struct v4l2_mpeg_compression *p=arg;
/*FIXME: Several fields not shown */
if (!vfd->vidioc_s_mpegcomp)
break;
dbgarg (cmd, "ts_pid_pmt=%d, ts_pid_audio=%d, "
"ts_pid_video=%d, ts_pid_pcr=%d, ps_size=%d, "
"au_sample_rate=%d, au_pesid=%c, "
"vi_frame_rate=%d, vi_frames_per_gop=%d, "
"vi_bframes_count=%d, vi_pesid=%c\n",
p->ts_pid_pmt,p->ts_pid_audio, p->ts_pid_video,
p->ts_pid_pcr, p->ps_size, p->au_sample_rate,
p->au_pesid, p->vi_frame_rate,
p->vi_frames_per_gop, p->vi_bframes_count,
p->vi_pesid);
ret=vfd->vidioc_s_mpegcomp(file, fh, p);
break;
}
case VIDIOC_G_JPEGCOMP:
{
struct v4l2_jpegcompression *p=arg;
if (!vfd->vidioc_g_jpegcomp)
break;
ret=vfd->vidioc_g_jpegcomp(file, fh, p);
if (!ret)
dbgarg (cmd, "quality=%d, APPn=%d, "
"APP_len=%d, COM_len=%d, "
"jpeg_markers=%d\n",
p->quality,p->APPn,p->APP_len,
p->COM_len,p->jpeg_markers);
break;
}
case VIDIOC_S_JPEGCOMP:
{
struct v4l2_jpegcompression *p=arg;
if (!vfd->vidioc_g_jpegcomp)
break;
dbgarg (cmd, "quality=%d, APPn=%d, APP_len=%d, "
"COM_len=%d, jpeg_markers=%d\n",
p->quality,p->APPn,p->APP_len,
p->COM_len,p->jpeg_markers);
ret=vfd->vidioc_s_jpegcomp(file, fh, p);
break;
}
case VIDIOC_G_PARM:
{
struct v4l2_streamparm *p=arg;
if (vfd->vidioc_g_parm) {
ret=vfd->vidioc_g_parm(file, fh, p);
} else {
struct v4l2_standard s;
int i;
if (!vfd->tvnormsize) {
printk (KERN_WARNING "%s: no TV norms defined!\n",
vfd->name);
break;
}
if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
for (i = 0; i < vfd->tvnormsize; i++)
if (vfd->tvnorms[i].id == vfd->current_norm)
break;
if (i >= vfd->tvnormsize)
return -EINVAL;
v4l2_video_std_construct(&s, vfd->current_norm,
vfd->tvnorms[i].name);
memset(p,0,sizeof(*p));
p->parm.capture.timeperframe = s.frameperiod;
ret=0;
}
dbgarg (cmd, "type=%d\n", p->type);
break;
}
case VIDIOC_S_PARM:
{
struct v4l2_streamparm *p=arg;
if (!vfd->vidioc_s_parm)
break;
dbgarg (cmd, "type=%d\n", p->type);
ret=vfd->vidioc_s_parm(file, fh, p);
break;
}
case VIDIOC_G_TUNER:
{
struct v4l2_tuner *p=arg;
if (!vfd->vidioc_g_tuner)
break;
ret=vfd->vidioc_g_tuner(file, fh, p);
if (!ret)
dbgarg (cmd, "index=%d, name=%s, type=%d, "
"capability=%d, rangelow=%d, "
"rangehigh=%d, signal=%d, afc=%d, "
"rxsubchans=%d, audmode=%d\n",
p->index, p->name, p->type,
p->capability, p->rangelow,
p->rangehigh, p->rxsubchans,
p->audmode, p->signal, p->afc);
break;
}
case VIDIOC_S_TUNER:
{
struct v4l2_tuner *p=arg;
if (!vfd->vidioc_s_tuner)
break;
dbgarg (cmd, "index=%d, name=%s, type=%d, "
"capability=%d, rangelow=%d, rangehigh=%d, "
"signal=%d, afc=%d, rxsubchans=%d, "
"audmode=%d\n",p->index, p->name, p->type,
p->capability, p->rangelow,p->rangehigh,
p->rxsubchans, p->audmode, p->signal,
p->afc);
ret=vfd->vidioc_s_tuner(file, fh, p);
break;
}
case VIDIOC_G_FREQUENCY:
{
struct v4l2_frequency *p=arg;
if (!vfd->vidioc_g_frequency)
break;
ret=vfd->vidioc_g_frequency(file, fh, p);
if (!ret)
dbgarg (cmd, "tuner=%d, type=%d, frequency=%d\n",
p->tuner,p->type,p->frequency);
break;
}
case VIDIOC_S_FREQUENCY:
{
struct v4l2_frequency *p=arg;
if (!vfd->vidioc_s_frequency)
break;
dbgarg (cmd, "tuner=%d, type=%d, frequency=%d\n",
p->tuner,p->type,p->frequency);
ret=vfd->vidioc_s_frequency(file, fh, p);
break;
}
case VIDIOC_G_SLICED_VBI_CAP:
{
struct v4l2_sliced_vbi_cap *p=arg;
if (!vfd->vidioc_g_sliced_vbi_cap)
break;
ret=vfd->vidioc_g_sliced_vbi_cap(file, fh, p);
if (!ret)
dbgarg (cmd, "service_set=%d\n", p->service_set);
break;
}
case VIDIOC_LOG_STATUS:
{
if (!vfd->vidioc_log_status)
break;
ret=vfd->vidioc_log_status(file, fh);
break;
}
/* --- Others --------------------------------------------- */
default:
ret=v4l_compat_translate_ioctl(inode,file,cmd,arg,__video_do_ioctl);
}
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
if (ret<0) {
printk ("%s: err:\n", vfd->name);
v4l_print_ioctl(vfd->name, cmd);
}
}
return ret;
}
int video_ioctl2 (struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
char sbuf[128];
void *mbuf = NULL;
void *parg = NULL;
int err = -EINVAL;
int is_ext_ctrl;
size_t ctrls_size = 0;
void __user *user_ptr = NULL;
#ifdef __OLD_VIDIOC_
cmd = video_fix_command(cmd);
#endif
is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS ||
cmd == VIDIOC_TRY_EXT_CTRLS);
/* Copy arguments into temp kernel buffer */
switch (_IOC_DIR(cmd)) {
case _IOC_NONE:
parg = NULL;
break;
case _IOC_READ:
case _IOC_WRITE:
case (_IOC_WRITE | _IOC_READ):
if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
parg = sbuf;
} else {
/* too big to allocate from stack */
mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
if (NULL == mbuf)
return -ENOMEM;
parg = mbuf;
}
err = -EFAULT;
if (_IOC_DIR(cmd) & _IOC_WRITE)
if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
goto out;
break;
}
if (is_ext_ctrl) {
struct v4l2_ext_controls *p = parg;
/* In case of an error, tell the caller that it wasn't
a specific control that caused it. */
p->error_idx = p->count;
user_ptr = (void __user *)p->controls;
if (p->count) {
ctrls_size = sizeof(struct v4l2_ext_control) * p->count;
/* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */
mbuf = kmalloc(ctrls_size, GFP_KERNEL);
err = -ENOMEM;
if (NULL == mbuf)
goto out_ext_ctrl;
err = -EFAULT;
if (copy_from_user(mbuf, user_ptr, ctrls_size))
goto out_ext_ctrl;
p->controls = mbuf;
}
}
/* Handles IOCTL */
err = __video_do_ioctl(inode, file, cmd, parg);
if (err == -ENOIOCTLCMD)
err = -EINVAL;
if (is_ext_ctrl) {
struct v4l2_ext_controls *p = parg;
p->controls = (void *)user_ptr;
if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size))
err = -EFAULT;
goto out_ext_ctrl;
}
if (err < 0)
goto out;
out_ext_ctrl:
/* Copy results into user buffer */
switch (_IOC_DIR(cmd))
{
case _IOC_READ:
case (_IOC_WRITE | _IOC_READ):
if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
err = -EFAULT;
break;
}
out:
kfree(mbuf);
return err;
}
static struct file_operations video_fops;
/**
* video_register_device - register video4linux devices
* @vfd: video device structure we want to register
* @type: type of device to register
* @nr: which device number (0 == /dev/video0, 1 == /dev/video1, ...
* -1 == first free)
*
* The registration code assigns minor numbers based on the type
* requested. -ENFILE is returned in all the device slots for this
* category are full. If not then the minor field is set and the
* driver initialize function is called (if non %NULL).
*
* Zero is returned on success.
*
* Valid types are
*
* %VFL_TYPE_GRABBER - A frame grabber
*
* %VFL_TYPE_VTX - A teletext device
*
* %VFL_TYPE_VBI - Vertical blank data (undecoded)
*
* %VFL_TYPE_RADIO - A radio card
*/
int video_register_device(struct video_device *vfd, int type, int nr)
{
int i=0;
int base;
int end;
int ret;
char *name_base;
switch(type)
{
case VFL_TYPE_GRABBER:
base=MINOR_VFL_TYPE_GRABBER_MIN;
end=MINOR_VFL_TYPE_GRABBER_MAX+1;
name_base = "video";
break;
case VFL_TYPE_VTX:
base=MINOR_VFL_TYPE_VTX_MIN;
end=MINOR_VFL_TYPE_VTX_MAX+1;
name_base = "vtx";
break;
case VFL_TYPE_VBI:
base=MINOR_VFL_TYPE_VBI_MIN;
end=MINOR_VFL_TYPE_VBI_MAX+1;
name_base = "vbi";
break;
case VFL_TYPE_RADIO:
base=MINOR_VFL_TYPE_RADIO_MIN;
end=MINOR_VFL_TYPE_RADIO_MAX+1;
name_base = "radio";
break;
default:
printk(KERN_ERR "%s called with unknown type: %d\n",
__FUNCTION__, type);
return -1;
}
/* pick a minor number */
mutex_lock(&videodev_lock);
if (nr >= 0 && nr < end-base) {
/* use the one the driver asked for */
i = base+nr;
if (NULL != video_device[i]) {
mutex_unlock(&videodev_lock);
return -ENFILE;
}
} else {
/* use first free */
for(i=base;i<end;i++)
if (NULL == video_device[i])
break;
if (i == end) {
mutex_unlock(&videodev_lock);
return -ENFILE;
}
}
video_device[i]=vfd;
vfd->minor=i;
mutex_unlock(&videodev_lock);
mutex_init(&vfd->lock);
/* sysfs class */
memset(&vfd->class_dev, 0x00, sizeof(vfd->class_dev));
if (vfd->dev)
vfd->class_dev.dev = vfd->dev;
vfd->class_dev.class = &video_class;
vfd->class_dev.devt = MKDEV(VIDEO_MAJOR, vfd->minor);
sprintf(vfd->class_dev.class_id, "%s%d", name_base, i - base);
ret = class_device_register(&vfd->class_dev);
if (ret < 0) {
printk(KERN_ERR "%s: class_device_register failed\n",
__FUNCTION__);
goto fail_minor;
}
ret = class_device_create_file(&vfd->class_dev, &class_device_attr_name);
if (ret < 0) {
printk(KERN_ERR "%s: class_device_create_file 'name' failed\n",
__FUNCTION__);
goto fail_classdev;
}
#if 1
/* needed until all drivers are fixed */
if (!vfd->release)
printk(KERN_WARNING "videodev: \"%s\" has no release callback. "
"Please fix your driver for proper sysfs support, see "
"http://lwn.net/Articles/36850/\n", vfd->name);
#endif
return 0;
fail_classdev:
class_device_unregister(&vfd->class_dev);
fail_minor:
mutex_lock(&videodev_lock);
video_device[vfd->minor] = NULL;
vfd->minor = -1;
mutex_unlock(&videodev_lock);
return ret;
}
/**
* video_unregister_device - unregister a video4linux device
* @vfd: the device to unregister
*
* This unregisters the passed device and deassigns the minor
* number. Future open calls will be met with errors.
*/
void video_unregister_device(struct video_device *vfd)
{
mutex_lock(&videodev_lock);
if(video_device[vfd->minor]!=vfd)
panic("videodev: bad unregister");
video_device[vfd->minor]=NULL;
class_device_unregister(&vfd->class_dev);
mutex_unlock(&videodev_lock);
}
/*
* Video fs operations
*/
static struct file_operations video_fops=
{
.owner = THIS_MODULE,
.llseek = no_llseek,
.open = video_open,
};
/*
* Initialise video for linux
*/
static int __init videodev_init(void)
{
int ret;
printk(KERN_INFO "Linux video capture interface: v2.00\n");
if (register_chrdev(VIDEO_MAJOR, VIDEO_NAME, &video_fops)) {
printk(KERN_WARNING "video_dev: unable to get major %d\n", VIDEO_MAJOR);
return -EIO;
}
ret = class_register(&video_class);
if (ret < 0) {
unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
printk(KERN_WARNING "video_dev: class_register failed\n");
return -EIO;
}
return 0;
}
static void __exit videodev_exit(void)
{
class_unregister(&video_class);
unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
}
module_init(videodev_init)
module_exit(videodev_exit)
EXPORT_SYMBOL(video_register_device);
EXPORT_SYMBOL(video_unregister_device);
EXPORT_SYMBOL(video_devdata);
EXPORT_SYMBOL(video_usercopy);
EXPORT_SYMBOL(video_exclusive_open);
EXPORT_SYMBOL(video_exclusive_release);
EXPORT_SYMBOL(video_ioctl2);
EXPORT_SYMBOL(video_device_alloc);
EXPORT_SYMBOL(video_device_release);
MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2");
MODULE_LICENSE("GPL");
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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