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V4L/DVB (5146): Make VIDIOC_INT_[SG]_REGISTER ioctls no longer internal only

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The direct register access ioctls were defined as kernel internal only,
but they are very useful for debugging hardware from userspace and are
used as such.  Officially export them.

VIDIOC_INT_[SG]_REGISTER is renamed to VIDIOC_DBG_[SG]_REGISTER 
Definition of ioctl and struct v4l2_register is moved from v4l2-common.h 
to videodev2.h.

Types used in struct v4l2_register are changed to the userspace 
exportable versions (u32 -> __u32, etc). 

Use of VIDIOC_DBG_S_REGISTER requires CAP_SYS_ADMIN permission, so move 
the check into the video_ioctl2() dispatcher so it doesn't need to be 
duplicated in each driver's call-back function. CAP_SYS_ADMIN check is 
added to pvrusb2 (which doesn't use video_ioctl2).

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Trent Piepho 2007-01-23 22:38:13 -03:00 committed by Mauro Carvalho Chehab
parent dbbff48f39
commit 52ebc763d8
16 changed files with 57 additions and 50 deletions
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4
drivers/media/video/cx25840/cx25840-core.c
View file

@ -628,7 +628,7 @@ static int cx25840_command(struct i2c_client *client, unsigned int cmd,
#ifdef CONFIG_VIDEO_ADV_DEBUG
/* ioctls to allow direct access to the
* cx25840 registers for testing */
case VIDIOC_INT_G_REGISTER:
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_register *reg = arg;
@ -638,7 +638,7 @@ static int cx25840_command(struct i2c_client *client, unsigned int cmd,
break;
}
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *reg = arg;

2
drivers/media/video/cx88/cx88-video.c
View file

@ -1405,8 +1405,6 @@ static int vidioc_s_register (struct file *file, void *fh,
if (reg->i2c_id != 0)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
cx_write(reg->reg&0xffffff, reg->val);
return 0;
}

6
drivers/media/video/pvrusb2/pvrusb2-hdw.c
View file

@ -3277,7 +3277,7 @@ static int pvr2_hdw_get_eeprom_addr(struct pvr2_hdw *hdw)
int pvr2_hdw_register_access(struct pvr2_hdw *hdw,
u32 chip_id,unsigned long reg_id,
u32 chip_id, u32 reg_id,
int setFl,u32 *val_ptr)
{
#ifdef CONFIG_VIDEO_ADV_DEBUG
@ -3295,8 +3295,8 @@ int pvr2_hdw_register_access(struct pvr2_hdw *hdw,
cp = list_entry(item,struct pvr2_i2c_client,list);
if (cp->client->driver->id != chip_id) continue;
stat = pvr2_i2c_client_cmd(
cp,(setFl ? VIDIOC_INT_S_REGISTER :
VIDIOC_INT_G_REGISTER),&req);
cp,(setFl ? VIDIOC_DBG_S_REGISTER :
VIDIOC_DBG_G_REGISTER),&req);
if (!setFl) *val_ptr = req.val;
okFl = !0;
break;

2
drivers/media/video/pvrusb2/pvrusb2-hdw.h
View file

@ -222,7 +222,7 @@ void pvr2_hdw_v4l_store_minor_number(struct pvr2_hdw *,
setFl - true to set the register, false to read it
val_ptr - storage location for source / result. */
int pvr2_hdw_register_access(struct pvr2_hdw *,
u32 chip_id,unsigned long reg_id,
u32 chip_id,u32 reg_id,
int setFl,u32 *val_ptr);
/* The following entry points are all lower level things you normally don't

14
drivers/media/video/pvrusb2/pvrusb2-v4l2.c
View file

@ -738,16 +738,20 @@ static int pvr2_v4l2_do_ioctl(struct inode *inode, struct file *file,
break;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_INT_G_REGISTER:
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
if (!capable(CAP_SYS_ADMIN)) {
ret = -EPERM;
break;
} /* fall through */
case VIDIOC_DBG_G_REGISTER:
{
u32 val;
struct v4l2_register *req = (struct v4l2_register *)arg;
if (cmd == VIDIOC_INT_S_REGISTER) val = req->val;
if (cmd == VIDIOC_DBG_S_REGISTER) val = req->val;
ret = pvr2_hdw_register_access(
hdw,req->i2c_id,req->reg,
cmd == VIDIOC_INT_S_REGISTER,&val);
if (cmd == VIDIOC_INT_G_REGISTER) req->val = val;
cmd == VIDIOC_DBG_S_REGISTER,&val);
if (cmd == VIDIOC_DBG_G_REGISTER) req->val = val;
break;
}
#endif

4
drivers/media/video/saa7115.c
View file

@ -1417,7 +1417,7 @@ static int saa711x_command(struct i2c_client *client, unsigned int cmd, void *ar
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_INT_G_REGISTER:
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_register *reg = arg;
@ -1427,7 +1427,7 @@ static int saa711x_command(struct i2c_client *client, unsigned int cmd, void *ar
break;
}
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *reg = arg;

4
drivers/media/video/saa7127.c
View file

@ -614,7 +614,7 @@ static int saa7127_command(struct i2c_client *client,
break;
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_INT_G_REGISTER:
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_register *reg = arg;
@ -624,7 +624,7 @@ static int saa7127_command(struct i2c_client *client,
break;
}
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *reg = arg;

4
drivers/media/video/tvp5150.c
View file

@ -950,7 +950,7 @@ static int tvp5150_command(struct i2c_client *c,
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_INT_G_REGISTER:
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_register *reg = arg;
@ -960,7 +960,7 @@ static int tvp5150_command(struct i2c_client *c,
break;
}
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *reg = arg;

4
drivers/media/video/upd64031a.c
View file

@ -162,7 +162,7 @@ static int upd64031a_command(struct i2c_client *client, unsigned int cmd, void *
break;
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_INT_G_REGISTER:
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_register *reg = arg;
@ -172,7 +172,7 @@ static int upd64031a_command(struct i2c_client *client, unsigned int cmd, void *
break;
}
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *reg = arg;
u8 addr = reg->reg & 0xff;

4
drivers/media/video/upd64083.c
View file

@ -139,7 +139,7 @@ static int upd64083_command(struct i2c_client *client, unsigned int cmd, void *a
break;
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_INT_G_REGISTER:
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_register *reg = arg;
@ -149,7 +149,7 @@ static int upd64083_command(struct i2c_client *client, unsigned int cmd, void *a
break;
}
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *reg = arg;
u8 addr = reg->reg & 0xff;

12
drivers/media/video/usbvision/usbvision-video.c
View file

@ -519,7 +519,7 @@ static int usbvision_v4l2_do_ioctl(struct inode *inode, struct file *file,
#ifdef CONFIG_VIDEO_ADV_DEBUG
/* ioctls to allow direct acces to the NT100x registers */
case VIDIOC_INT_G_REGISTER:
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_register *reg = arg;
int errCode;
@ -529,17 +529,17 @@ static int usbvision_v4l2_do_ioctl(struct inode *inode, struct file *file,
/* NT100x has a 8-bit register space */
errCode = usbvision_read_reg(usbvision, reg->reg&0xff);
if (errCode < 0) {
err("%s: VIDIOC_INT_G_REGISTER failed: error %d", __FUNCTION__, errCode);
err("%s: VIDIOC_DBG_G_REGISTER failed: error %d", __FUNCTION__, errCode);
}
else {
reg->val=(unsigned char)errCode;
PDEBUG(DBG_IOCTL, "VIDIOC_INT_G_REGISTER reg=0x%02X, value=0x%02X",
PDEBUG(DBG_IOCTL, "VIDIOC_DBG_G_REGISTER reg=0x%02X, value=0x%02X",
(unsigned int)reg->reg, reg->val);
errCode = 0; // No error
}
return errCode;
}
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *reg = arg;
int errCode;
@ -550,10 +550,10 @@ static int usbvision_v4l2_do_ioctl(struct inode *inode, struct file *file,
return -EPERM;
errCode = usbvision_write_reg(usbvision, reg->reg&0xff, reg->val);
if (errCode < 0) {
err("%s: VIDIOC_INT_S_REGISTER failed: error %d", __FUNCTION__, errCode);
err("%s: VIDIOC_DBG_S_REGISTER failed: error %d", __FUNCTION__, errCode);
}
else {
PDEBUG(DBG_IOCTL, "VIDIOC_INT_S_REGISTER reg=0x%02X, value=0x%02X",
PDEBUG(DBG_IOCTL, "VIDIOC_DBG_S_REGISTER reg=0x%02X, value=0x%02X",
(unsigned int)reg->reg, reg->val);
errCode = 0;
}

11
drivers/media/video/v4l2-common.c
View file

@ -400,9 +400,10 @@ static const char *v4l2_int_ioctls[] = {
[_IOC_NR(TUNER_SET_STANDBY)] = "TUNER_SET_STANDBY",
[_IOC_NR(TDA9887_SET_CONFIG)] = "TDA9887_SET_CONFIG",
[_IOC_NR(VIDIOC_DBG_S_REGISTER)] = "VIDIOC_DBG_S_REGISTER",
[_IOC_NR(VIDIOC_DBG_G_REGISTER)] = "VIDIOC_DBG_G_REGISTER",
[_IOC_NR(VIDIOC_INT_S_TUNER_MODE)] = "VIDIOC_INT_S_TUNER_MODE",
[_IOC_NR(VIDIOC_INT_S_REGISTER)] = "VIDIOC_INT_S_REGISTER",
[_IOC_NR(VIDIOC_INT_G_REGISTER)] = "VIDIOC_INT_G_REGISTER",
[_IOC_NR(VIDIOC_INT_RESET)] = "VIDIOC_INT_RESET",
[_IOC_NR(VIDIOC_INT_AUDIO_CLOCK_FREQ)] = "VIDIOC_INT_AUDIO_CLOCK_FREQ",
[_IOC_NR(VIDIOC_INT_DECODE_VBI_LINE)] = "VIDIOC_INT_DECODE_VBI_LINE",
@ -753,11 +754,11 @@ void v4l_printk_ioctl_arg(char *s,unsigned int cmd, void *arg)
p->id,p->index,p->name);
break;
}
case VIDIOC_INT_G_REGISTER:
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_G_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *p=arg;
printk ("%s: i2c_id=%d, reg=%lu, val=%d\n", s,
printk ("%s: i2c_id=%d, reg=%d, val=%d\n", s,
p->i2c_id,p->reg,p->val);
break;

8
drivers/media/video/videodev.c
View file

@ -1454,17 +1454,19 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
break;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_INT_G_REGISTER:
case VIDIOC_DBG_G_REGISTER:
{
struct v4l2_register *p=arg;
if (vfd->vidioc_g_register)
ret=vfd->vidioc_g_register(file, fh, p);
break;
}
case VIDIOC_INT_S_REGISTER:
case VIDIOC_DBG_S_REGISTER:
{
struct v4l2_register *p=arg;
if (vfd->vidioc_s_register)
if (!capable(CAP_SYS_ADMIN))
ret=-EPERM;
else if (vfd->vidioc_s_register)
ret=vfd->vidioc_s_register(file, fh, p);
break;
}

14
include/linux/videodev2.h
View file

@ -1270,6 +1270,17 @@ struct v4l2_streamparm
} parm;
};
/*
* A D V A N C E D D E B U G G I N G
*/
/* VIDIOC_DBG_G_REGISTER and VIDIOC_DBG_S_REGISTER */
struct v4l2_register {
__u32 i2c_id; /* I2C driver ID of the I2C chip, or 0 for the host */
__u32 reg;
__u32 val;
};
/*
* I O C T L C O D E S F O R V I D E O D E V I C E S
*
@ -1339,6 +1350,9 @@ struct v4l2_streamparm
#define VIDIOC_ENUM_FRAMESIZES _IOWR ('V', 74, struct v4l2_frmsizeenum)
#define VIDIOC_ENUM_FRAMEINTERVALS _IOWR ('V', 75, struct v4l2_frmivalenum)
#endif
/* only implemented if CONFIG_VIDEO_ADV_DEBUG is defined */
#define VIDIOC_DBG_S_REGISTER _IOW ('d', 100, struct v4l2_register)
#define VIDIOC_DBG_G_REGISTER _IOWR('d', 101, struct v4l2_register)
#ifdef __OLD_VIDIOC_
/* for compatibility, will go away some day */

11
include/media/v4l2-common.h
View file

@ -99,13 +99,6 @@ u32 v4l2_ctrl_next(const u32 * const *ctrl_classes, u32 id);
/* Internal ioctls */
/* VIDIOC_INT_G_REGISTER and VIDIOC_INT_S_REGISTER */
struct v4l2_register {
u32 i2c_id; /* I2C driver ID of the I2C chip. 0 for the I2C adapter. */
unsigned long reg;
u32 val;
};
/* VIDIOC_INT_DECODE_VBI_LINE */
struct v4l2_decode_vbi_line {
u32 is_second_field; /* Set to 0 for the first (odd) field,
@ -175,9 +168,7 @@ enum v4l2_chip_ident {
Replacement of TUNER_SET_STANDBY. */
#define VIDIOC_INT_S_STANDBY _IOW('d', 94, u32)
/* only implemented if CONFIG_VIDEO_ADV_DEBUG is defined */
#define VIDIOC_INT_S_REGISTER _IOW ('d', 100, struct v4l2_register)
#define VIDIOC_INT_G_REGISTER _IOWR('d', 101, struct v4l2_register)
/* 100, 101 used by VIDIOC_DBG_[SG]_REGISTER */
/* Generic reset command. The argument selects which subsystems to reset.
Passing 0 will always reset the whole chip. */

3
include/media/v4l2-dev.h
View file

@ -77,9 +77,6 @@ int v4l_compat_translate_ioctl(struct inode *inode, struct file *file,
extern long v4l_compat_ioctl32(struct file *file, unsigned int cmd,
unsigned long arg);
/* Forward definition of v4l2-common.h defined structure */
struct v4l2_register;
/*
* Newer version of video_device, handled by videodev2.c
* This version moves redundant code from video device code to