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Commit 902fc997 authored by Trent Piepho's avatar Trent Piepho Committed by Mauro Carvalho Chehab
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V4L/DVB (4722): Cx88: Add support for VIDIOC_INT_[SR]_REGISTER ioctls 



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: default avatarTrent Piepho <xyzzy@speakeasy.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 45a9b83f

drivers/media/video/cx88/cx88-video.c

+24 −0
Original line number Diff line number Diff line
@@ -1490,6 +1490,30 @@ int cx88_do_ioctl(struct inode *inode, struct file *file, int radio, 
		mutex_unlock(&core->lock);

		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:

		return v4l_compat_translate_ioctl(inode,file,cmd,arg,