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linux/drivers/media/video/v4l2-ioctl.c

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/*
* Video capture interface for Linux version 2
*
* A generic framework to process V4L2 ioctl commands.
*
* 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@lxorguk.ukuu.org.uk> (version 1)
* Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#define __OLD_VIDIOC_ /* To allow fixing old calls */
#include <linux/videodev.h>
#include <linux/videodev2.h>
#ifdef CONFIG_VIDEO_V4L1
#include <linux/videodev.h>
#endif
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-chip-ident.h>
#define dbgarg(cmd, fmt, arg...) \
do { \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) { \
printk(KERN_DEBUG "%s: ", vfd->name); \
v4l_printk_ioctl(cmd); \
printk(" " fmt, ## arg); \
} \
} while (0)
#define dbgarg2(fmt, arg...) \
do { \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) \
printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);\
} while (0)
#define dbgarg3(fmt, arg...) \
do { \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) \
printk(KERN_CONT "%s: " fmt, vfd->name, ## arg);\
} while (0)
/* Zero out the end of the struct pointed to by p. Everthing after, but
* not including, the specified field is cleared. */
#define CLEAR_AFTER_FIELD(p, field) \
memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))
struct std_descr {
v4l2_std_id std;
const char *descr;
};
static const struct std_descr standards[] = {
{ V4L2_STD_NTSC, "NTSC" },
{ V4L2_STD_NTSC_M, "NTSC-M" },
{ V4L2_STD_NTSC_M_JP, "NTSC-M-JP" },
{ V4L2_STD_NTSC_M_KR, "NTSC-M-KR" },
{ V4L2_STD_NTSC_443, "NTSC-443" },
{ V4L2_STD_PAL, "PAL" },
{ V4L2_STD_PAL_BG, "PAL-BG" },
{ V4L2_STD_PAL_B, "PAL-B" },
{ V4L2_STD_PAL_B1, "PAL-B1" },
{ V4L2_STD_PAL_G, "PAL-G" },
{ V4L2_STD_PAL_H, "PAL-H" },
{ V4L2_STD_PAL_I, "PAL-I" },
{ V4L2_STD_PAL_DK, "PAL-DK" },
{ V4L2_STD_PAL_D, "PAL-D" },
{ V4L2_STD_PAL_D1, "PAL-D1" },
{ V4L2_STD_PAL_K, "PAL-K" },
{ V4L2_STD_PAL_M, "PAL-M" },
{ V4L2_STD_PAL_N, "PAL-N" },
{ V4L2_STD_PAL_Nc, "PAL-Nc" },
{ V4L2_STD_PAL_60, "PAL-60" },
{ V4L2_STD_SECAM, "SECAM" },
{ V4L2_STD_SECAM_B, "SECAM-B" },
{ V4L2_STD_SECAM_G, "SECAM-G" },
{ V4L2_STD_SECAM_H, "SECAM-H" },
{ V4L2_STD_SECAM_DK, "SECAM-DK" },
{ V4L2_STD_SECAM_D, "SECAM-D" },
{ V4L2_STD_SECAM_K, "SECAM-K" },
{ V4L2_STD_SECAM_K1, "SECAM-K1" },
{ V4L2_STD_SECAM_L, "SECAM-L" },
{ V4L2_STD_SECAM_LC, "SECAM-Lc" },
{ 0, "Unknown" }
};
/* video4linux standard ID conversion to standard name
*/
const char *v4l2_norm_to_name(v4l2_std_id id)
{
u32 myid = id;
int i;
/* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
64 bit comparations. So, on that architecture, with some gcc
variants, compilation fails. Currently, the max value is 30bit wide.
*/
BUG_ON(myid != id);
for (i = 0; standards[i].std; i++)
if (myid == standards[i].std)
break;
return standards[i].descr;
}
EXPORT_SYMBOL(v4l2_norm_to_name);
/* Returns frame period for the given standard */
void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
{
if (id & V4L2_STD_525_60) {
frameperiod->numerator = 1001;
frameperiod->denominator = 30000;
} else {
frameperiod->numerator = 1;
frameperiod->denominator = 25;
}
}
EXPORT_SYMBOL(v4l2_video_std_frame_period);
/* Fill in the fields of a v4l2_standard structure according to the
'id' and 'transmission' parameters. Returns negative on error. */
int v4l2_video_std_construct(struct v4l2_standard *vs,
int id, const char *name)
{
vs->id = id;
v4l2_video_std_frame_period(id, &vs->frameperiod);
vs->framelines = (id & V4L2_STD_525_60) ? 525 : 625;
strlcpy(vs->name, name, sizeof(vs->name));
return 0;
}
EXPORT_SYMBOL(v4l2_video_std_construct);
/* ----------------------------------------------------------------- */
/* some arrays for pretty-printing debug messages of enum types */
const char *v4l2_field_names[] = {
[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",
[V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
[V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
};
EXPORT_SYMBOL(v4l2_field_names);
const char *v4l2_type_names[] = {
[V4L2_BUF_TYPE_VIDEO_CAPTURE] = "vid-cap",
[V4L2_BUF_TYPE_VIDEO_OVERLAY] = "vid-overlay",
[V4L2_BUF_TYPE_VIDEO_OUTPUT] = "vid-out",
[V4L2_BUF_TYPE_VBI_CAPTURE] = "vbi-cap",
[V4L2_BUF_TYPE_VBI_OUTPUT] = "vbi-out",
[V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
[V4L2_BUF_TYPE_SLICED_VBI_OUTPUT] = "sliced-vbi-out",
[V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
};
EXPORT_SYMBOL(v4l2_type_names);
static const char *v4l2_memory_names[] = {
[V4L2_MEMORY_MMAP] = "mmap",
[V4L2_MEMORY_USERPTR] = "userptr",
[V4L2_MEMORY_OVERLAY] = "overlay",
};
#define prt_names(a, arr) ((((a) >= 0) && ((a) < ARRAY_SIZE(arr))) ? \
arr[a] : "unknown")
/* ------------------------------------------------------------------ */
/* debug help functions */
#ifdef CONFIG_VIDEO_V4L1_COMPAT
static const char *v4l1_ioctls[] = {
[_IOC_NR(VIDIOCGCAP)] = "VIDIOCGCAP",
[_IOC_NR(VIDIOCGCHAN)] = "VIDIOCGCHAN",
[_IOC_NR(VIDIOCSCHAN)] = "VIDIOCSCHAN",
[_IOC_NR(VIDIOCGTUNER)] = "VIDIOCGTUNER",
[_IOC_NR(VIDIOCSTUNER)] = "VIDIOCSTUNER",
[_IOC_NR(VIDIOCGPICT)] = "VIDIOCGPICT",
[_IOC_NR(VIDIOCSPICT)] = "VIDIOCSPICT",
[_IOC_NR(VIDIOCCAPTURE)] = "VIDIOCCAPTURE",
[_IOC_NR(VIDIOCGWIN)] = "VIDIOCGWIN",
[_IOC_NR(VIDIOCSWIN)] = "VIDIOCSWIN",
[_IOC_NR(VIDIOCGFBUF)] = "VIDIOCGFBUF",
[_IOC_NR(VIDIOCSFBUF)] = "VIDIOCSFBUF",
[_IOC_NR(VIDIOCKEY)] = "VIDIOCKEY",
[_IOC_NR(VIDIOCGFREQ)] = "VIDIOCGFREQ",
[_IOC_NR(VIDIOCSFREQ)] = "VIDIOCSFREQ",
[_IOC_NR(VIDIOCGAUDIO)] = "VIDIOCGAUDIO",
[_IOC_NR(VIDIOCSAUDIO)] = "VIDIOCSAUDIO",
[_IOC_NR(VIDIOCSYNC)] = "VIDIOCSYNC",
[_IOC_NR(VIDIOCMCAPTURE)] = "VIDIOCMCAPTURE",
[_IOC_NR(VIDIOCGMBUF)] = "VIDIOCGMBUF",
[_IOC_NR(VIDIOCGUNIT)] = "VIDIOCGUNIT",
[_IOC_NR(VIDIOCGCAPTURE)] = "VIDIOCGCAPTURE",
[_IOC_NR(VIDIOCSCAPTURE)] = "VIDIOCSCAPTURE",
[_IOC_NR(VIDIOCSPLAYMODE)] = "VIDIOCSPLAYMODE",
[_IOC_NR(VIDIOCSWRITEMODE)] = "VIDIOCSWRITEMODE",
[_IOC_NR(VIDIOCGPLAYINFO)] = "VIDIOCGPLAYINFO",
[_IOC_NR(VIDIOCSMICROCODE)] = "VIDIOCSMICROCODE",
[_IOC_NR(VIDIOCGVBIFMT)] = "VIDIOCGVBIFMT",
[_IOC_NR(VIDIOCSVBIFMT)] = "VIDIOCSVBIFMT"
};
#define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)
#endif
static const char *v4l2_ioctls[] = {
[_IOC_NR(VIDIOC_QUERYCAP)] = "VIDIOC_QUERYCAP",
[_IOC_NR(VIDIOC_RESERVED)] = "VIDIOC_RESERVED",
[_IOC_NR(VIDIOC_ENUM_FMT)] = "VIDIOC_ENUM_FMT",
[_IOC_NR(VIDIOC_G_FMT)] = "VIDIOC_G_FMT",
[_IOC_NR(VIDIOC_S_FMT)] = "VIDIOC_S_FMT",
[_IOC_NR(VIDIOC_REQBUFS)] = "VIDIOC_REQBUFS",
[_IOC_NR(VIDIOC_QUERYBUF)] = "VIDIOC_QUERYBUF",
[_IOC_NR(VIDIOC_G_FBUF)] = "VIDIOC_G_FBUF",
[_IOC_NR(VIDIOC_S_FBUF)] = "VIDIOC_S_FBUF",
[_IOC_NR(VIDIOC_OVERLAY)] = "VIDIOC_OVERLAY",
[_IOC_NR(VIDIOC_QBUF)] = "VIDIOC_QBUF",
[_IOC_NR(VIDIOC_DQBUF)] = "VIDIOC_DQBUF",
[_IOC_NR(VIDIOC_STREAMON)] = "VIDIOC_STREAMON",
[_IOC_NR(VIDIOC_STREAMOFF)] = "VIDIOC_STREAMOFF",
[_IOC_NR(VIDIOC_G_PARM)] = "VIDIOC_G_PARM",
[_IOC_NR(VIDIOC_S_PARM)] = "VIDIOC_S_PARM",
[_IOC_NR(VIDIOC_G_STD)] = "VIDIOC_G_STD",
[_IOC_NR(VIDIOC_S_STD)] = "VIDIOC_S_STD",
[_IOC_NR(VIDIOC_ENUMSTD)] = "VIDIOC_ENUMSTD",
[_IOC_NR(VIDIOC_ENUMINPUT)] = "VIDIOC_ENUMINPUT",
[_IOC_NR(VIDIOC_G_CTRL)] = "VIDIOC_G_CTRL",
[_IOC_NR(VIDIOC_S_CTRL)] = "VIDIOC_S_CTRL",
[_IOC_NR(VIDIOC_G_TUNER)] = "VIDIOC_G_TUNER",
[_IOC_NR(VIDIOC_S_TUNER)] = "VIDIOC_S_TUNER",
[_IOC_NR(VIDIOC_G_AUDIO)] = "VIDIOC_G_AUDIO",
[_IOC_NR(VIDIOC_S_AUDIO)] = "VIDIOC_S_AUDIO",
[_IOC_NR(VIDIOC_QUERYCTRL)] = "VIDIOC_QUERYCTRL",
[_IOC_NR(VIDIOC_QUERYMENU)] = "VIDIOC_QUERYMENU",
[_IOC_NR(VIDIOC_G_INPUT)] = "VIDIOC_G_INPUT",
[_IOC_NR(VIDIOC_S_INPUT)] = "VIDIOC_S_INPUT",
[_IOC_NR(VIDIOC_G_OUTPUT)] = "VIDIOC_G_OUTPUT",
[_IOC_NR(VIDIOC_S_OUTPUT)] = "VIDIOC_S_OUTPUT",
[_IOC_NR(VIDIOC_ENUMOUTPUT)] = "VIDIOC_ENUMOUTPUT",
[_IOC_NR(VIDIOC_G_AUDOUT)] = "VIDIOC_G_AUDOUT",
[_IOC_NR(VIDIOC_S_AUDOUT)] = "VIDIOC_S_AUDOUT",
[_IOC_NR(VIDIOC_G_MODULATOR)] = "VIDIOC_G_MODULATOR",
[_IOC_NR(VIDIOC_S_MODULATOR)] = "VIDIOC_S_MODULATOR",
[_IOC_NR(VIDIOC_G_FREQUENCY)] = "VIDIOC_G_FREQUENCY",
[_IOC_NR(VIDIOC_S_FREQUENCY)] = "VIDIOC_S_FREQUENCY",
[_IOC_NR(VIDIOC_CROPCAP)] = "VIDIOC_CROPCAP",
[_IOC_NR(VIDIOC_G_CROP)] = "VIDIOC_G_CROP",
[_IOC_NR(VIDIOC_S_CROP)] = "VIDIOC_S_CROP",
[_IOC_NR(VIDIOC_G_JPEGCOMP)] = "VIDIOC_G_JPEGCOMP",
[_IOC_NR(VIDIOC_S_JPEGCOMP)] = "VIDIOC_S_JPEGCOMP",
[_IOC_NR(VIDIOC_QUERYSTD)] = "VIDIOC_QUERYSTD",
[_IOC_NR(VIDIOC_TRY_FMT)] = "VIDIOC_TRY_FMT",
[_IOC_NR(VIDIOC_ENUMAUDIO)] = "VIDIOC_ENUMAUDIO",
[_IOC_NR(VIDIOC_ENUMAUDOUT)] = "VIDIOC_ENUMAUDOUT",
[_IOC_NR(VIDIOC_G_PRIORITY)] = "VIDIOC_G_PRIORITY",
[_IOC_NR(VIDIOC_S_PRIORITY)] = "VIDIOC_S_PRIORITY",
[_IOC_NR(VIDIOC_G_SLICED_VBI_CAP)] = "VIDIOC_G_SLICED_VBI_CAP",
[_IOC_NR(VIDIOC_LOG_STATUS)] = "VIDIOC_LOG_STATUS",
[_IOC_NR(VIDIOC_G_EXT_CTRLS)] = "VIDIOC_G_EXT_CTRLS",
[_IOC_NR(VIDIOC_S_EXT_CTRLS)] = "VIDIOC_S_EXT_CTRLS",
[_IOC_NR(VIDIOC_TRY_EXT_CTRLS)] = "VIDIOC_TRY_EXT_CTRLS",
#if 1
[_IOC_NR(VIDIOC_ENUM_FRAMESIZES)] = "VIDIOC_ENUM_FRAMESIZES",
[_IOC_NR(VIDIOC_ENUM_FRAMEINTERVALS)] = "VIDIOC_ENUM_FRAMEINTERVALS",
[_IOC_NR(VIDIOC_G_ENC_INDEX)] = "VIDIOC_G_ENC_INDEX",
[_IOC_NR(VIDIOC_ENCODER_CMD)] = "VIDIOC_ENCODER_CMD",
[_IOC_NR(VIDIOC_TRY_ENCODER_CMD)] = "VIDIOC_TRY_ENCODER_CMD",
[_IOC_NR(VIDIOC_DBG_S_REGISTER)] = "VIDIOC_DBG_S_REGISTER",
[_IOC_NR(VIDIOC_DBG_G_REGISTER)] = "VIDIOC_DBG_G_REGISTER",
[_IOC_NR(VIDIOC_DBG_G_CHIP_IDENT)] = "VIDIOC_DBG_G_CHIP_IDENT",
[_IOC_NR(VIDIOC_S_HW_FREQ_SEEK)] = "VIDIOC_S_HW_FREQ_SEEK",
#endif
[_IOC_NR(VIDIOC_ENUM_DV_PRESETS)] = "VIDIOC_ENUM_DV_PRESETS",
[_IOC_NR(VIDIOC_S_DV_PRESET)] = "VIDIOC_S_DV_PRESET",
[_IOC_NR(VIDIOC_G_DV_PRESET)] = "VIDIOC_G_DV_PRESET",
[_IOC_NR(VIDIOC_QUERY_DV_PRESET)] = "VIDIOC_QUERY_DV_PRESET",
[_IOC_NR(VIDIOC_S_DV_TIMINGS)] = "VIDIOC_S_DV_TIMINGS",
[_IOC_NR(VIDIOC_G_DV_TIMINGS)] = "VIDIOC_G_DV_TIMINGS",
};
#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
/* Common ioctl debug function. This function can be used by
external ioctl messages as well as internal V4L ioctl */
void v4l_printk_ioctl(unsigned int cmd)
{
char *dir, *type;
switch (_IOC_TYPE(cmd)) {
case 'd':
type = "v4l2_int";
break;
#ifdef CONFIG_VIDEO_V4L1_COMPAT
case 'v':
if (_IOC_NR(cmd) >= V4L1_IOCTLS) {
type = "v4l1";
break;
}
printk("%s", v4l1_ioctls[_IOC_NR(cmd)]);
return;
#endif
case 'V':
if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
type = "v4l2";
break;
}
printk("%s", v4l2_ioctls[_IOC_NR(cmd)]);
return;
default:
type = "unknown";
}
switch (_IOC_DIR(cmd)) {
case _IOC_NONE: dir = "--"; break;
case _IOC_READ: dir = "r-"; break;
case _IOC_WRITE: dir = "-w"; break;
case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
default: dir = "*ERR*"; break;
}
printk("%s ioctl '%c', dir=%s, #%d (0x%08x)",
type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
}
EXPORT_SYMBOL(v4l_printk_ioctl);
/*
* 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
*/
long
video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
v4l2_kioctl func)
{
char sbuf[128];
void *mbuf = NULL;
void *parg = NULL;
long 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(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;
}
EXPORT_SYMBOL(video_usercopy);
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, length=%d\n",
p->timestamp.tv_sec / 3600,
(int)(p->timestamp.tv_sec / 60) % 60,
(int)(p->timestamp.tv_sec % 60),
(long)p->timestamp.tv_usec,
p->index,
prt_names(p->type, v4l2_type_names),
p->bytesused, p->flags,
p->field, p->sequence,
prt_names(p->memory, v4l2_memory_names),
p->m.userptr, p->length);
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=%c%c%c%c, field=%s, "
"bytesperline=%d sizeimage=%d, colorspace=%d\n",
fmt->width, fmt->height,
(fmt->pixelformat & 0xff),
(fmt->pixelformat >> 8) & 0xff,
(fmt->pixelformat >> 16) & 0xff,
(fmt->pixelformat >> 24) & 0xff,
prt_names(fmt->field, v4l2_field_names),
fmt->bytesperline, fmt->sizeimage, fmt->colorspace);
};
static inline void v4l_print_ext_ctrls(unsigned int cmd,
struct video_device *vfd, struct v4l2_ext_controls *c, int show_vals)
{
__u32 i;
if (!(vfd->debug & V4L2_DEBUG_IOCTL_ARG))
return;
dbgarg(cmd, "");
printk(KERN_CONT "class=0x%x", c->ctrl_class);
for (i = 0; i < c->count; i++) {
if (show_vals && !c->controls[i].size)
printk(KERN_CONT " id/val=0x%x/0x%x",
c->controls[i].id, c->controls[i].value);
else
printk(KERN_CONT " id=0x%x,size=%u",
c->controls[i].id, c->controls[i].size);
}
printk(KERN_CONT "\n");
};
static inline int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
{
__u32 i;
/* zero the reserved fields */
c->reserved[0] = c->reserved[1] = 0;
for (i = 0; i < c->count; i++)
c->controls[i].reserved2[0] = 0;
/* V4L2_CID_PRIVATE_BASE cannot be used as control class
when using extended controls.
Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
is it allowed for backwards compatibility.
*/
if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
return 0;
/* Check that all controls are from the same control class. */
for (i = 0; i < c->count; i++) {
if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
c->error_idx = i;
return 0;
}
}
return 1;
}
static int check_fmt(const struct v4l2_ioctl_ops *ops, enum v4l2_buf_type type)
{
if (ops == NULL)
return -EINVAL;
switch (type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (ops->vidioc_g_fmt_vid_cap)
return 0;
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (ops->vidioc_g_fmt_vid_overlay)
return 0;
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (ops->vidioc_g_fmt_vid_out)
return 0;
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
if (ops->vidioc_g_fmt_vid_out_overlay)
return 0;
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
if (ops->vidioc_g_fmt_vbi_cap)
return 0;
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
if (ops->vidioc_g_fmt_vbi_out)
return 0;
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
if (ops->vidioc_g_fmt_sliced_vbi_cap)
return 0;
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
if (ops->vidioc_g_fmt_sliced_vbi_out)
return 0;
break;
case V4L2_BUF_TYPE_PRIVATE:
if (ops->vidioc_g_fmt_type_private)
return 0;
break;
}
return -EINVAL;
}
static long __video_do_ioctl(struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *vfd = video_devdata(file);
const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
void *fh = file->private_data;
long ret = -EINVAL;
if ((vfd->debug & V4L2_DEBUG_IOCTL) &&
!(vfd->debug & V4L2_DEBUG_IOCTL_ARG)) {
v4l_print_ioctl(vfd->name, cmd);
printk(KERN_CONT "\n");
}
if (ops == NULL) {
printk(KERN_WARNING "videodev: \"%s\" has no ioctl_ops.\n",
vfd->name);
return -EINVAL;
}
#ifdef CONFIG_VIDEO_V4L1_COMPAT
/***********************************************************
Handles calls to the obsoleted V4L1 API
Due to the nature of VIDIOCGMBUF, each driver that supports
V4L1 should implement its own handler for this ioctl.
***********************************************************/
/* --- streaming capture ------------------------------------- */
if (cmd == VIDIOCGMBUF) {
struct video_mbuf *p = arg;
if (!ops->vidiocgmbuf)
return ret;
ret = ops->vidiocgmbuf(file, fh, p);
if (!ret)
dbgarg(cmd, "size=%d, frames=%d, offsets=0x%08lx\n",
p->size, p->frames,
(unsigned long)p->offsets);
return ret;
}
/********************************************************
All other V4L1 calls are handled by v4l1_compat module.
Those calls will be translated into V4L2 calls, and
__video_do_ioctl will be called again, with one or more
V4L2 ioctls.
********************************************************/
if (_IOC_TYPE(cmd) == 'v' && _IOC_NR(cmd) < BASE_VIDIOCPRIVATE)
return v4l_compat_translate_ioctl(file, cmd, arg,
__video_do_ioctl);
#endif
switch (cmd) {
/* --- capabilities ------------------------------------------ */
case VIDIOC_QUERYCAP:
{
struct v4l2_capability *cap = (struct v4l2_capability *)arg;
if (!ops->vidioc_querycap)
break;
ret = ops->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 (!ops->vidioc_g_priority)
break;
ret = ops->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 (!ops->vidioc_s_priority)
break;
dbgarg(cmd, "setting priority to %d\n", *p);
ret = ops->vidioc_s_priority(file, fh, *p);
break;
}
/* --- capture ioctls ---------------------------------------- */
case VIDIOC_ENUM_FMT:
{
struct v4l2_fmtdesc *f = arg;
switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (ops->vidioc_enum_fmt_vid_cap)
ret = ops->vidioc_enum_fmt_vid_cap(file, fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (ops->vidioc_enum_fmt_vid_overlay)
ret = ops->vidioc_enum_fmt_vid_overlay(file,
fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (ops->vidioc_enum_fmt_vid_out)
ret = ops->vidioc_enum_fmt_vid_out(file, fh, f);
break;
case V4L2_BUF_TYPE_PRIVATE:
if (ops->vidioc_enum_fmt_type_private)
ret = ops->vidioc_enum_fmt_type_private(file,
fh, f);
break;
default:
break;
}
if (!ret)
dbgarg(cmd, "index=%d, type=%d, flags=%d, "
"pixelformat=%c%c%c%c, description='%s'\n",
f->index, f->type, f->flags,
(f->pixelformat & 0xff),
(f->pixelformat >> 8) & 0xff,
(f->pixelformat >> 16) & 0xff,
(f->pixelformat >> 24) & 0xff,
f->description);
break;
}
case VIDIOC_G_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));
switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (ops->vidioc_g_fmt_vid_cap)
ret = ops->vidioc_g_fmt_vid_cap(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd, &f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (ops->vidioc_g_fmt_vid_overlay)
ret = ops->vidioc_g_fmt_vid_overlay(file,
fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (ops->vidioc_g_fmt_vid_out)
ret = ops->vidioc_g_fmt_vid_out(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd, &f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
if (ops->vidioc_g_fmt_vid_out_overlay)
ret = ops->vidioc_g_fmt_vid_out_overlay(file,
fh, f);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
if (ops->vidioc_g_fmt_vbi_cap)
ret = ops->vidioc_g_fmt_vbi_cap(file, fh, f);
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
if (ops->vidioc_g_fmt_vbi_out)
ret = ops->vidioc_g_fmt_vbi_out(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
if (ops->vidioc_g_fmt_sliced_vbi_cap)
ret = ops->vidioc_g_fmt_sliced_vbi_cap(file,
fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
if (ops->vidioc_g_fmt_sliced_vbi_out)
ret = ops->vidioc_g_fmt_sliced_vbi_out(file,
fh, f);
break;
case V4L2_BUF_TYPE_PRIVATE:
if (ops->vidioc_g_fmt_type_private)
ret = ops->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));
switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
CLEAR_AFTER_FIELD(f, fmt.pix);
v4l_print_pix_fmt(vfd, &f->fmt.pix);
if (ops->vidioc_s_fmt_vid_cap)
ret = ops->vidioc_s_fmt_vid_cap(file, fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
CLEAR_AFTER_FIELD(f, fmt.win);
if (ops->vidioc_s_fmt_vid_overlay)
ret = ops->vidioc_s_fmt_vid_overlay(file,
fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
CLEAR_AFTER_FIELD(f, fmt.pix);
v4l_print_pix_fmt(vfd, &f->fmt.pix);
if (ops->vidioc_s_fmt_vid_out)
ret = ops->vidioc_s_fmt_vid_out(file, fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
CLEAR_AFTER_FIELD(f, fmt.win);
if (ops->vidioc_s_fmt_vid_out_overlay)
ret = ops->vidioc_s_fmt_vid_out_overlay(file,
fh, f);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
CLEAR_AFTER_FIELD(f, fmt.vbi);
if (ops->vidioc_s_fmt_vbi_cap)
ret = ops->vidioc_s_fmt_vbi_cap(file, fh, f);
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
CLEAR_AFTER_FIELD(f, fmt.vbi);
if (ops->vidioc_s_fmt_vbi_out)
ret = ops->vidioc_s_fmt_vbi_out(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
CLEAR_AFTER_FIELD(f, fmt.sliced);
if (ops->vidioc_s_fmt_sliced_vbi_cap)
ret = ops->vidioc_s_fmt_sliced_vbi_cap(file,
fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
CLEAR_AFTER_FIELD(f, fmt.sliced);
if (ops->vidioc_s_fmt_sliced_vbi_out)
ret = ops->vidioc_s_fmt_sliced_vbi_out(file,
fh, f);
break;
case V4L2_BUF_TYPE_PRIVATE:
/* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
if (ops->vidioc_s_fmt_type_private)
ret = ops->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));
switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
CLEAR_AFTER_FIELD(f, fmt.pix);
if (ops->vidioc_try_fmt_vid_cap)
ret = ops->vidioc_try_fmt_vid_cap(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd, &f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
CLEAR_AFTER_FIELD(f, fmt.win);
if (ops->vidioc_try_fmt_vid_overlay)
ret = ops->vidioc_try_fmt_vid_overlay(file,
fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
CLEAR_AFTER_FIELD(f, fmt.pix);
if (ops->vidioc_try_fmt_vid_out)
ret = ops->vidioc_try_fmt_vid_out(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd, &f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
CLEAR_AFTER_FIELD(f, fmt.win);
if (ops->vidioc_try_fmt_vid_out_overlay)
ret = ops->vidioc_try_fmt_vid_out_overlay(file,
fh, f);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
CLEAR_AFTER_FIELD(f, fmt.vbi);
if (ops->vidioc_try_fmt_vbi_cap)
ret = ops->vidioc_try_fmt_vbi_cap(file, fh, f);
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
CLEAR_AFTER_FIELD(f, fmt.vbi);
if (ops->vidioc_try_fmt_vbi_out)
ret = ops->vidioc_try_fmt_vbi_out(file, fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
CLEAR_AFTER_FIELD(f, fmt.sliced);
if (ops->vidioc_try_fmt_sliced_vbi_cap)
ret = ops->vidioc_try_fmt_sliced_vbi_cap(file,
fh, f);
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
CLEAR_AFTER_FIELD(f, fmt.sliced);
if (ops->vidioc_try_fmt_sliced_vbi_out)
ret = ops->vidioc_try_fmt_sliced_vbi_out(file,
fh, f);
break;
case V4L2_BUF_TYPE_PRIVATE:
/* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
if (ops->vidioc_try_fmt_type_private)
ret = ops->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 (!ops->vidioc_reqbufs)
break;
ret = check_fmt(ops, p->type);
if (ret)
break;
if (p->type < V4L2_BUF_TYPE_PRIVATE)
CLEAR_AFTER_FIELD(p, memory);
ret = ops->vidioc_reqbufs(file, fh, p);
dbgarg(cmd, "count=%d, type=%s, memory=%s\n",
p->count,
prt_names(p->type, v4l2_type_names),
prt_names(p->memory, v4l2_memory_names));
break;
}
case VIDIOC_QUERYBUF:
{
struct v4l2_buffer *p = arg;
if (!ops->vidioc_querybuf)
break;
ret = check_fmt(ops, p->type);
if (ret)
break;
ret = ops->vidioc_querybuf(file, fh, p);
if (!ret)
dbgbuf(cmd, vfd, p);
break;
}
case VIDIOC_QBUF:
{
struct v4l2_buffer *p = arg;
if (!ops->vidioc_qbuf)
break;
ret = check_fmt(ops, p->type);
if (ret)
break;
ret = ops->vidioc_qbuf(file, fh, p);
if (!ret)
dbgbuf(cmd, vfd, p);
break;
}
case VIDIOC_DQBUF:
{
struct v4l2_buffer *p = arg;
if (!ops->vidioc_dqbuf)
break;
ret = check_fmt(ops, p->type);
if (ret)
break;
ret = ops->vidioc_dqbuf(file, fh, p);
if (!ret)
dbgbuf(cmd, vfd, p);
break;
}
case VIDIOC_OVERLAY:
{
int *i = arg;
if (!ops->vidioc_overlay)
break;
dbgarg(cmd, "value=%d\n", *i);
ret = ops->vidioc_overlay(file, fh, *i);
break;
}
case VIDIOC_G_FBUF:
{
struct v4l2_framebuffer *p = arg;
if (!ops->vidioc_g_fbuf)
break;
ret = ops->vidioc_g_fbuf(file, fh, arg);
if (!ret) {
dbgarg(cmd, "capability=0x%x, 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 (!ops->vidioc_s_fbuf)
break;
dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
p->capability, p->flags, (unsigned long)p->base);
v4l_print_pix_fmt(vfd, &p->fmt);
ret = ops->vidioc_s_fbuf(file, fh, arg);
break;
}
case VIDIOC_STREAMON:
{
enum v4l2_buf_type i = *(int *)arg;
if (!ops->vidioc_streamon)
break;
dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
ret = ops->vidioc_streamon(file, fh, i);
break;
}
case VIDIOC_STREAMOFF:
{
enum v4l2_buf_type i = *(int *)arg;
if (!ops->vidioc_streamoff)
break;
dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
ret = ops->vidioc_streamoff(file, fh, i);
break;
}
/* ---------- tv norms ---------- */
case VIDIOC_ENUMSTD:
{
struct v4l2_standard *p = arg;
v4l2_std_id id = vfd->tvnorms, curr_id = 0;
unsigned int index = p->index, i, j = 0;
const char *descr = "";
/* Return norm array in a canonical way */
for (i = 0; i <= index && id; i++) {
/* last std value in the standards array is 0, so this
while always ends there since (id & 0) == 0. */
while ((id & standards[j].std) != standards[j].std)
j++;
curr_id = standards[j].std;
descr = standards[j].descr;
j++;
if (curr_id == 0)
break;
if (curr_id != V4L2_STD_PAL &&
curr_id != V4L2_STD_SECAM &&
curr_id != V4L2_STD_NTSC)
id &= ~curr_id;
}
if (i <= index)
return -EINVAL;
v4l2_video_std_construct(p, curr_id, descr);
dbgarg(cmd, "index=%d, id=0x%Lx, 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;
ret = 0;
/* Calls the specific handler */
if (ops->vidioc_g_std)
ret = ops->vidioc_g_std(file, fh, id);
else if (vfd->current_norm)
*id = vfd->current_norm;
else
ret = -EINVAL;
if (!ret)
dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id);
break;
}
case VIDIOC_S_STD:
{
v4l2_std_id *id = arg, norm;
dbgarg(cmd, "std=%08Lx\n", (long long unsigned)*id);
norm = (*id) & vfd->tvnorms;
if (vfd->tvnorms && !norm) /* Check if std is supported */
break;
/* Calls the specific handler */
if (ops->vidioc_s_std)
ret = ops->vidioc_s_std(file, fh, &norm);
else
ret = -EINVAL;
/* Updates standard information */
if (ret >= 0)
vfd->current_norm = norm;
break;
}
case VIDIOC_QUERYSTD:
{
v4l2_std_id *p = arg;
if (!ops->vidioc_querystd)
break;
ret = ops->vidioc_querystd(file, fh, arg);
if (!ret)
dbgarg(cmd, "detected std=%08Lx\n",
(unsigned long long)*p);
break;
}
/* ------ input switching ---------- */
/* FIXME: Inputs can be handled inside videodev2 */
case VIDIOC_ENUMINPUT:
{
struct v4l2_input *p = arg;
/*
* We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
* CAP_STD here based on ioctl handler provided by the
* driver. If the driver doesn't support these
* for a specific input, it must override these flags.
*/
if (ops->vidioc_s_std)
p->capabilities |= V4L2_IN_CAP_STD;
if (ops->vidioc_s_dv_preset)
p->capabilities |= V4L2_IN_CAP_PRESETS;
if (ops->vidioc_s_dv_timings)
p->capabilities |= V4L2_IN_CAP_CUSTOM_TIMINGS;
if (!ops->vidioc_enum_input)
break;
ret = ops->vidioc_enum_input(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, type=%d, "
"audioset=%d, "
"tuner=%d, std=%08Lx, 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 (!ops->vidioc_g_input)
break;
ret = ops->vidioc_g_input(file, fh, i);
if (!ret)
dbgarg(cmd, "value=%d\n", *i);
break;
}
case VIDIOC_S_INPUT:
{
unsigned int *i = arg;
if (!ops->vidioc_s_input)
break;
dbgarg(cmd, "value=%d\n", *i);
ret = ops->vidioc_s_input(file, fh, *i);
break;
}
/* ------ output switching ---------- */
case VIDIOC_ENUMOUTPUT:
{
struct v4l2_output *p = arg;
if (!ops->vidioc_enum_output)
break;
/*
* We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
* CAP_STD here based on ioctl handler provided by the
* driver. If the driver doesn't support these
* for a specific output, it must override these flags.
*/
if (ops->vidioc_s_std)
p->capabilities |= V4L2_OUT_CAP_STD;
if (ops->vidioc_s_dv_preset)
p->capabilities |= V4L2_OUT_CAP_PRESETS;
if (ops->vidioc_s_dv_timings)
p->capabilities |= V4L2_OUT_CAP_CUSTOM_TIMINGS;
ret = ops->vidioc_enum_output(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, type=%d, "
"audioset=0x%x, "
"modulator=%d, std=0x%08Lx\n",
p->index, p->name, p->type, p->audioset,
p->modulator, (unsigned long long)p->std);
break;
}
case VIDIOC_G_OUTPUT:
{
unsigned int *i = arg;
if (!ops->vidioc_g_output)
break;
ret = ops->vidioc_g_output(file, fh, i);
if (!ret)
dbgarg(cmd, "value=%d\n", *i);
break;
}
case VIDIOC_S_OUTPUT:
{
unsigned int *i = arg;
if (!ops->vidioc_s_output)
break;
dbgarg(cmd, "value=%d\n", *i);
ret = ops->vidioc_s_output(file, fh, *i);
break;
}
/* --- controls ---------------------------------------------- */
case VIDIOC_QUERYCTRL:
{
struct v4l2_queryctrl *p = arg;
if (!ops->vidioc_queryctrl)
break;
ret = ops->vidioc_queryctrl(file, fh, p);
if (!ret)
dbgarg(cmd, "id=0x%x, 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);
else
dbgarg(cmd, "id=0x%x\n", p->id);
break;
}
case VIDIOC_G_CTRL:
{
struct v4l2_control *p = arg;
if (ops->vidioc_g_ctrl)
ret = ops->vidioc_g_ctrl(file, fh, p);
else if (ops->vidioc_g_ext_ctrls) {
struct v4l2_ext_controls ctrls;
struct v4l2_ext_control ctrl;
ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
ctrls.count = 1;
ctrls.controls = &ctrl;
ctrl.id = p->id;
ctrl.value = p->value;
if (check_ext_ctrls(&ctrls, 1)) {
ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
if (ret == 0)
p->value = ctrl.value;
}
} else
break;
if (!ret)
dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
else
dbgarg(cmd, "id=0x%x\n", p->id);
break;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *p = arg;
struct v4l2_ext_controls ctrls;
struct v4l2_ext_control ctrl;
if (!ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)
break;
dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
if (ops->vidioc_s_ctrl) {
ret = ops->vidioc_s_ctrl(file, fh, p);
break;
}
if (!ops->vidioc_s_ext_ctrls)
break;
ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
ctrls.count = 1;
ctrls.controls = &ctrl;
ctrl.id = p->id;
ctrl.value = p->value;
if (check_ext_ctrls(&ctrls, 1))
ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
break;
}
case VIDIOC_G_EXT_CTRLS:
{
struct v4l2_ext_controls *p = arg;
p->error_idx = p->count;
if (!ops->vidioc_g_ext_ctrls)
break;
if (check_ext_ctrls(p, 0))
ret = ops->vidioc_g_ext_ctrls(file, fh, p);
v4l_print_ext_ctrls(cmd, vfd, p, !ret);
break;
}
case VIDIOC_S_EXT_CTRLS:
{
struct v4l2_ext_controls *p = arg;
p->error_idx = p->count;
if (!ops->vidioc_s_ext_ctrls)
break;
v4l_print_ext_ctrls(cmd, vfd, p, 1);
if (check_ext_ctrls(p, 0))
ret = ops->vidioc_s_ext_ctrls(file, fh, p);
break;
}
case VIDIOC_TRY_EXT_CTRLS:
{
struct v4l2_ext_controls *p = arg;
p->error_idx = p->count;
if (!ops->vidioc_try_ext_ctrls)
break;
v4l_print_ext_ctrls(cmd, vfd, p, 1);
if (check_ext_ctrls(p, 0))
ret = ops->vidioc_try_ext_ctrls(file, fh, p);
break;
}
case VIDIOC_QUERYMENU:
{
struct v4l2_querymenu *p = arg;
if (!ops->vidioc_querymenu)
break;
ret = ops->vidioc_querymenu(file, fh, p);
if (!ret)
dbgarg(cmd, "id=0x%x, index=%d, name=%s\n",
p->id, p->index, p->name);
else
dbgarg(cmd, "id=0x%x, index=%d\n",
p->id, p->index);
break;
}
/* --- audio ---------------------------------------------- */
case VIDIOC_ENUMAUDIO:
{
struct v4l2_audio *p = arg;
if (!ops->vidioc_enumaudio)
break;
ret = ops->vidioc_enumaudio(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
"mode=0x%x\n", p->index, p->name,
p->capability, p->mode);
else
dbgarg(cmd, "index=%d\n", p->index);
break;
}
case VIDIOC_G_AUDIO:
{
struct v4l2_audio *p = arg;
if (!ops->vidioc_g_audio)
break;
ret = ops->vidioc_g_audio(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
"mode=0x%x\n", p->index,
p->name, p->capability, p->mode);
else
dbgarg(cmd, "index=%d\n", p->index);
break;
}
case VIDIOC_S_AUDIO:
{
struct v4l2_audio *p = arg;
if (!ops->vidioc_s_audio)
break;
dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
"mode=0x%x\n", p->index, p->name,
p->capability, p->mode);
ret = ops->vidioc_s_audio(file, fh, p);
break;
}
case VIDIOC_ENUMAUDOUT:
{
struct v4l2_audioout *p = arg;
if (!ops->vidioc_enumaudout)
break;
dbgarg(cmd, "Enum for index=%d\n", p->index);
ret = ops->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 (!ops->vidioc_g_audout)
break;
ret = ops->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 (!ops->vidioc_s_audout)
break;
dbgarg(cmd, "index=%d, name=%s, capability=%d, "
"mode=%d\n", p->index, p->name,
p->capability, p->mode);
ret = ops->vidioc_s_audout(file, fh, p);
break;
}
case VIDIOC_G_MODULATOR:
{
struct v4l2_modulator *p = arg;
if (!ops->vidioc_g_modulator)
break;
ret = ops->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 (!ops->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 = ops->vidioc_s_modulator(file, fh, p);
break;
}
case VIDIOC_G_CROP:
{
struct v4l2_crop *p = arg;
if (!ops->vidioc_g_crop)
break;
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret = ops->vidioc_g_crop(file, fh, p);
if (!ret)
dbgrect(vfd, "", &p->c);
break;
}
case VIDIOC_S_CROP:
{
struct v4l2_crop *p = arg;
if (!ops->vidioc_s_crop)
break;
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
dbgrect(vfd, "", &p->c);
ret = ops->vidioc_s_crop(file, fh, p);
break;
}
case VIDIOC_CROPCAP:
{
struct v4l2_cropcap *p = arg;
/*FIXME: Should also show v4l2_fract pixelaspect */
if (!ops->vidioc_cropcap)
break;
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret = ops->vidioc_cropcap(file, fh, p);
if (!ret) {
dbgrect(vfd, "bounds ", &p->bounds);
dbgrect(vfd, "defrect ", &p->defrect);
}
break;
}
case VIDIOC_G_JPEGCOMP:
{
struct v4l2_jpegcompression *p = arg;
if (!ops->vidioc_g_jpegcomp)
break;
ret = ops->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 (!ops->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 = ops->vidioc_s_jpegcomp(file, fh, p);
break;
}
case VIDIOC_G_ENC_INDEX:
{
struct v4l2_enc_idx *p = arg;
if (!ops->vidioc_g_enc_index)
break;
ret = ops->vidioc_g_enc_index(file, fh, p);
if (!ret)
dbgarg(cmd, "entries=%d, entries_cap=%d\n",
p->entries, p->entries_cap);
break;
}
case VIDIOC_ENCODER_CMD:
{
struct v4l2_encoder_cmd *p = arg;
if (!ops->vidioc_encoder_cmd)
break;
ret = ops->vidioc_encoder_cmd(file, fh, p);
if (!ret)
dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
break;
}
case VIDIOC_TRY_ENCODER_CMD:
{
struct v4l2_encoder_cmd *p = arg;
if (!ops->vidioc_try_encoder_cmd)
break;
ret = ops->vidioc_try_encoder_cmd(file, fh, p);
if (!ret)
dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
break;
}
case VIDIOC_G_PARM:
{
struct v4l2_streamparm *p = arg;
if (ops->vidioc_g_parm) {
ret = check_fmt(ops, p->type);
if (ret)
break;
ret = ops->vidioc_g_parm(file, fh, p);
} else {
v4l2_std_id std = vfd->current_norm;
if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
ret = 0;
if (ops->vidioc_g_std)
ret = ops->vidioc_g_std(file, fh, &std);
else if (std == 0)
ret = -EINVAL;
if (ret == 0)
v4l2_video_std_frame_period(std,
&p->parm.capture.timeperframe);
}
dbgarg(cmd, "type=%d\n", p->type);
break;
}
case VIDIOC_S_PARM:
{
struct v4l2_streamparm *p = arg;
if (!ops->vidioc_s_parm)
break;
ret = check_fmt(ops, p->type);
if (ret)
break;
dbgarg(cmd, "type=%d\n", p->type);
ret = ops->vidioc_s_parm(file, fh, p);
break;
}
case VIDIOC_G_TUNER:
{
struct v4l2_tuner *p = arg;
if (!ops->vidioc_g_tuner)
break;
ret = ops->vidioc_g_tuner(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, type=%d, "
"capability=0x%x, rangelow=%d, "
"rangehigh=%d, signal=%d, afc=%d, "
"rxsubchans=0x%x, audmode=%d\n",
p->index, p->name, p->type,
p->capability, p->rangelow,
p->rangehigh, p->signal, p->afc,
p->rxsubchans, p->audmode);
break;
}
case VIDIOC_S_TUNER:
{
struct v4l2_tuner *p = arg;
if (!ops->vidioc_s_tuner)
break;
dbgarg(cmd, "index=%d, name=%s, type=%d, "
"capability=0x%x, rangelow=%d, "
"rangehigh=%d, signal=%d, afc=%d, "
"rxsubchans=0x%x, audmode=%d\n",
p->index, p->name, p->type,
p->capability, p->rangelow,
p->rangehigh, p->signal, p->afc,
p->rxsubchans, p->audmode);
ret = ops->vidioc_s_tuner(file, fh, p);
break;
}
case VIDIOC_G_FREQUENCY:
{
struct v4l2_frequency *p = arg;
if (!ops->vidioc_g_frequency)
break;
ret = ops->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 (!ops->vidioc_s_frequency)
break;
dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
p->tuner, p->type, p->frequency);
ret = ops->vidioc_s_frequency(file, fh, p);
break;
}
case VIDIOC_G_SLICED_VBI_CAP:
{
struct v4l2_sliced_vbi_cap *p = arg;
if (!ops->vidioc_g_sliced_vbi_cap)
break;
/* Clear up to type, everything after type is zerod already */
memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret = ops->vidioc_g_sliced_vbi_cap(file, fh, p);
if (!ret)
dbgarg2("service_set=%d\n", p->service_set);
break;
}
case VIDIOC_LOG_STATUS:
{
if (!ops->vidioc_log_status)
break;
ret = ops->vidioc_log_status(file, fh);
break;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_dbg_register *p = arg;
if (!capable(CAP_SYS_ADMIN))
ret = -EPERM;
else if (ops->vidioc_g_register)
ret = ops->vidioc_g_register(file, fh, p);
break;
}
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_dbg_register *p = arg;
if (!capable(CAP_SYS_ADMIN))
ret = -EPERM;
else if (ops->vidioc_s_register)
ret = ops->vidioc_s_register(file, fh, p);
break;
}
#endif
case VIDIOC_DBG_G_CHIP_IDENT:
{
struct v4l2_dbg_chip_ident *p = arg;
if (!ops->vidioc_g_chip_ident)
break;
p->ident = V4L2_IDENT_NONE;
p->revision = 0;
ret = ops->vidioc_g_chip_ident(file, fh, p);
if (!ret)
dbgarg(cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision);
break;
}
case VIDIOC_S_HW_FREQ_SEEK:
{
struct v4l2_hw_freq_seek *p = arg;
if (!ops->vidioc_s_hw_freq_seek)
break;
dbgarg(cmd,
"tuner=%d, type=%d, seek_upward=%d, wrap_around=%d\n",
p->tuner, p->type, p->seek_upward, p->wrap_around);
ret = ops->vidioc_s_hw_freq_seek(file, fh, p);
break;
}
case VIDIOC_ENUM_FRAMESIZES:
{
struct v4l2_frmsizeenum *p = arg;
if (!ops->vidioc_enum_framesizes)
break;
ret = ops->vidioc_enum_framesizes(file, fh, p);
dbgarg(cmd,
"index=%d, pixelformat=%c%c%c%c, type=%d ",
p->index,
(p->pixel_format & 0xff),
(p->pixel_format >> 8) & 0xff,
(p->pixel_format >> 16) & 0xff,
(p->pixel_format >> 24) & 0xff,
p->type);
switch (p->type) {
case V4L2_FRMSIZE_TYPE_DISCRETE:
dbgarg3("width = %d, height=%d\n",
p->discrete.width, p->discrete.height);
break;
case V4L2_FRMSIZE_TYPE_STEPWISE:
dbgarg3("min %dx%d, max %dx%d, step %dx%d\n",
p->stepwise.min_width, p->stepwise.min_height,
p->stepwise.step_width, p->stepwise.step_height,
p->stepwise.max_width, p->stepwise.max_height);
break;
case V4L2_FRMSIZE_TYPE_CONTINUOUS:
dbgarg3("continuous\n");
break;
default:
dbgarg3("- Unknown type!\n");
}
break;
}
case VIDIOC_ENUM_FRAMEINTERVALS:
{
struct v4l2_frmivalenum *p = arg;
if (!ops->vidioc_enum_frameintervals)
break;
ret = ops->vidioc_enum_frameintervals(file, fh, p);
dbgarg(cmd,
"index=%d, pixelformat=%d, width=%d, height=%d, type=%d ",
p->index, p->pixel_format,
p->width, p->height, p->type);
switch (p->type) {
case V4L2_FRMIVAL_TYPE_DISCRETE:
dbgarg2("fps=%d/%d\n",
p->discrete.numerator,
p->discrete.denominator);
break;
case V4L2_FRMIVAL_TYPE_STEPWISE:
dbgarg2("min=%d/%d, max=%d/%d, step=%d/%d\n",
p->stepwise.min.numerator,
p->stepwise.min.denominator,
p->stepwise.max.numerator,
p->stepwise.max.denominator,
p->stepwise.step.numerator,
p->stepwise.step.denominator);
break;
case V4L2_FRMIVAL_TYPE_CONTINUOUS:
dbgarg2("continuous\n");
break;
default:
dbgarg2("- Unknown type!\n");
}
break;
}
case VIDIOC_ENUM_DV_PRESETS:
{
struct v4l2_dv_enum_preset *p = arg;
if (!ops->vidioc_enum_dv_presets)
break;
ret = ops->vidioc_enum_dv_presets(file, fh, p);
if (!ret)
dbgarg(cmd,
"index=%d, preset=%d, name=%s, width=%d,"
" height=%d ",
p->index, p->preset, p->name, p->width,
p->height);
break;
}
case VIDIOC_S_DV_PRESET:
{
struct v4l2_dv_preset *p = arg;
if (!ops->vidioc_s_dv_preset)
break;
dbgarg(cmd, "preset=%d\n", p->preset);
ret = ops->vidioc_s_dv_preset(file, fh, p);
break;
}
case VIDIOC_G_DV_PRESET:
{
struct v4l2_dv_preset *p = arg;
if (!ops->vidioc_g_dv_preset)
break;
ret = ops->vidioc_g_dv_preset(file, fh, p);
if (!ret)
dbgarg(cmd, "preset=%d\n", p->preset);
break;
}
case VIDIOC_QUERY_DV_PRESET:
{
struct v4l2_dv_preset *p = arg;
if (!ops->vidioc_query_dv_preset)
break;
ret = ops->vidioc_query_dv_preset(file, fh, p);
if (!ret)
dbgarg(cmd, "preset=%d\n", p->preset);
break;
}
case VIDIOC_S_DV_TIMINGS:
{
struct v4l2_dv_timings *p = arg;
if (!ops->vidioc_s_dv_timings)
break;
switch (p->type) {
case V4L2_DV_BT_656_1120:
dbgarg2("bt-656/1120:interlaced=%d, pixelclock=%lld,"
" width=%d, height=%d, polarities=%x,"
" hfrontporch=%d, hsync=%d, hbackporch=%d,"
" vfrontporch=%d, vsync=%d, vbackporch=%d,"
" il_vfrontporch=%d, il_vsync=%d,"
" il_vbackporch=%d\n",
p->bt.interlaced, p->bt.pixelclock,
p->bt.width, p->bt.height, p->bt.polarities,
p->bt.hfrontporch, p->bt.hsync,
p->bt.hbackporch, p->bt.vfrontporch,
p->bt.vsync, p->bt.vbackporch,
p->bt.il_vfrontporch, p->bt.il_vsync,
p->bt.il_vbackporch);
ret = ops->vidioc_s_dv_timings(file, fh, p);
break;
default:
dbgarg2("Unknown type %d!\n", p->type);
break;
}
break;
}
case VIDIOC_G_DV_TIMINGS:
{
struct v4l2_dv_timings *p = arg;
if (!ops->vidioc_g_dv_timings)
break;
ret = ops->vidioc_g_dv_timings(file, fh, p);
if (!ret) {
switch (p->type) {
case V4L2_DV_BT_656_1120:
dbgarg2("bt-656/1120:interlaced=%d,"
" pixelclock=%lld,"
" width=%d, height=%d, polarities=%x,"
" hfrontporch=%d, hsync=%d,"
" hbackporch=%d, vfrontporch=%d,"
" vsync=%d, vbackporch=%d,"
" il_vfrontporch=%d, il_vsync=%d,"
" il_vbackporch=%d\n",
p->bt.interlaced, p->bt.pixelclock,
p->bt.width, p->bt.height,
p->bt.polarities, p->bt.hfrontporch,
p->bt.hsync, p->bt.hbackporch,
p->bt.vfrontporch, p->bt.vsync,
p->bt.vbackporch, p->bt.il_vfrontporch,
p->bt.il_vsync, p->bt.il_vbackporch);
break;
default:
dbgarg2("Unknown type %d!\n", p->type);
break;
}
}
break;
}
default:
{
if (!ops->vidioc_default)
break;
ret = ops->vidioc_default(file, fh, cmd, arg);
break;
}
} /* switch */
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
if (ret < 0) {
v4l_print_ioctl(vfd->name, cmd);
printk(KERN_CONT " error %ld\n", ret);
}
}
return ret;
}
/* In some cases, only a few fields are used as input, i.e. when the app sets
* "index" and then the driver fills in the rest of the structure for the thing
* with that index. We only need to copy up the first non-input field. */
static unsigned long cmd_input_size(unsigned int cmd)
{
/* Size of structure up to and including 'field' */
#define CMDINSIZE(cmd, type, field) \
case VIDIOC_##cmd: \
return offsetof(struct v4l2_##type, field) + \
sizeof(((struct v4l2_##type *)0)->field);
switch (cmd) {
CMDINSIZE(ENUM_FMT, fmtdesc, type);
CMDINSIZE(G_FMT, format, type);
CMDINSIZE(QUERYBUF, buffer, type);
CMDINSIZE(G_PARM, streamparm, type);
CMDINSIZE(ENUMSTD, standard, index);
CMDINSIZE(ENUMINPUT, input, index);
CMDINSIZE(G_CTRL, control, id);
CMDINSIZE(G_TUNER, tuner, index);
CMDINSIZE(QUERYCTRL, queryctrl, id);
CMDINSIZE(QUERYMENU, querymenu, index);
CMDINSIZE(ENUMOUTPUT, output, index);
CMDINSIZE(G_MODULATOR, modulator, index);
CMDINSIZE(G_FREQUENCY, frequency, tuner);
CMDINSIZE(CROPCAP, cropcap, type);
CMDINSIZE(G_CROP, crop, type);
CMDINSIZE(ENUMAUDIO, audio, index);
CMDINSIZE(ENUMAUDOUT, audioout, index);
CMDINSIZE(ENCODER_CMD, encoder_cmd, flags);
CMDINSIZE(TRY_ENCODER_CMD, encoder_cmd, flags);
CMDINSIZE(G_SLICED_VBI_CAP, sliced_vbi_cap, type);
CMDINSIZE(ENUM_FRAMESIZES, frmsizeenum, pixel_format);
CMDINSIZE(ENUM_FRAMEINTERVALS, frmivalenum, height);
default:
return _IOC_SIZE(cmd);
}
}
long video_ioctl2(struct file *file,
unsigned int cmd, unsigned long arg)
{
char sbuf[128];
void *mbuf = NULL;
void *parg = NULL;
long 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 */
if (_IOC_DIR(cmd) != _IOC_NONE) {
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) {
unsigned long n = cmd_input_size(cmd);
if (copy_from_user(parg, (void __user *)arg, n))
goto out;
/* zero out anything we don't copy from userspace */
if (n < _IOC_SIZE(cmd))
memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
} else {
/* read-only ioctl */
memset(parg, 0, _IOC_SIZE(cmd));
}
}
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(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;
}
EXPORT_SYMBOL(video_ioctl2);
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