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V4L/DVB (4722): Cx88: Add support for VIDIOC_INT_[SR]_REGISTER ioctls

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Add support for the advanced debugging ioctls, to allow access to the
cx88 registers from userspace.  Only i2c_id == 0 is supported, for access
to the cx88 adapter itself.  There isn't any support for access to I2C
clients of the adapter.  Most of them don't have R/W registers anyway,
and its necessary to use i2c-dev to talk to them from userspace.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Trent Piepho 2006-10-04 20:33:51 -03:00 committed by Mauro Carvalho Chehab
parent 45a9b83fe4
commit 902fc997ad
1 changed files with 24 additions and 0 deletions
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24
drivers/media/video/cx88/cx88-video.c
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@ -1490,6 +1490,30 @@ int cx88_do_ioctl(struct inode *inode, struct file *file, int radio,
mutex_unlock(&core->lock); mutex_unlock(&core->lock);
return 0; return 0;
} }
#ifdef CONFIG_VIDEO_ADV_DEBUG
/* ioctls to allow direct acces to the cx2388x registers */
case VIDIOC_INT_G_REGISTER:
{
struct v4l2_register *reg = arg;
if (reg->i2c_id != 0)
return -EINVAL;
/* cx2388x has a 24-bit register space */
reg->val = cx_read(reg->reg&0xffffff);
return 0;
}
case VIDIOC_INT_S_REGISTER:
{
struct v4l2_register *reg = arg;
if (reg->i2c_id != 0)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
cx_write(reg->reg&0xffffff, reg->val);
return 0;
}
#endif
default: default:
return v4l_compat_translate_ioctl(inode,file,cmd,arg, return v4l_compat_translate_ioctl(inode,file,cmd,arg,