Re: [PATCH 1/1] smiapp: Add driver-specific control class, test pattern controls

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Sakari,

On Wednesday 28 May 2014 15:16:58 Sakari Ailus wrote:
> Laurent Pinchart wrote:
> > On Wednesday 28 May 2014 12:00:38 Sakari Ailus wrote:
> >> Add smiapp driver specific control sub-class for test pattern controls.
> >> More controls are expected since a fair amount of the standard
> >> functionality is still unsupported. There are sensor model specific
> >> functionality as well and expectedly thus also sensor specific controls.
> >> So reserve 128 controls for this driver.
> >> 
> >> This patch also adds test pattern controls for the four colour
> >> components.
> >> 
> >> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> >> ---
> >> This patch comes before the previous patch I sent to the thread. I missed
> >> this when sending it.
> >> 
> >>   include/uapi/linux/smiapp.h        | 34 +++++++++++++++++++++++++++++++
> >>   include/uapi/linux/v4l2-controls.h |  4 ++++
> >>   2 files changed, 38 insertions(+)
> >>   create mode 100644 include/uapi/linux/smiapp.h
> >> 
> >> diff --git a/include/uapi/linux/smiapp.h b/include/uapi/linux/smiapp.h
> >> new file mode 100644
> >> index 0000000..116fc69
> >> --- /dev/null
> >> +++ b/include/uapi/linux/smiapp.h
> >> @@ -0,0 +1,34 @@
> >> +/*
> >> + * include/media/smiapp.h
> >> + *
> >> + * Generic driver for SMIA/SMIA++ compliant camera modules
> >> + *
> >> + * Copyright (C) 2014 Intel Corporation
> >> + * Contact: Sakari Ailus <sakari.ailus@iki.fi>
> >> + *
> >> + * This program is free software; you can redistribute it and/or
> >> + * modify it under the terms of the GNU General Public License
> >> + * version 2 as published by the Free Software Foundation.
> >> + *
> >> + * This program is distributed in the hope that it will be useful, but
> >> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> >> + * General Public License for more details.
> >> + *
> >> + */
> >> +
> >> +#ifndef __UAPI_LINUX_SMIAPP_H_
> >> +#define __UAPI_LINUX_SMIAPP_H_
> >> +
> >> +#define V4L2_SMIAPP_TEST_PATTERN_MODE_DISABLED			0
> >> +#define V4L2_SMIAPP_TEST_PATTERN_MODE_SOLID_COLOUR		1
> >> +#define V4L2_SMIAPP_TEST_PATTERN_MODE_COLOUR_BARS		2
> >> +#define V4L2_SMIAPP_TEST_PATTERN_MODE_COLOUR_BARS_GREY		3
> >> +#define V4L2_SMIAPP_TEST_PATTERN_MODE_PN9			4
> >> +
> >> +#define V4L2_CID_SMIAPP_TEST_PATTERN_RED	(V4L2_CID_USER_SMIAPP_BASE |
> >> 0x01)
> >> +#define V4L2_CID_SMIAPP_TEST_PATTERN_GREENR	(V4L2_CID_USER_SMIAPP_BASE |
> >> 0x02)
> >> +#define V4L2_CID_SMIAPP_TEST_PATTERN_BLUE	(V4L2_CID_USER_SMIAPP_BASE |
> >> 0x03)
> >> +#define V4L2_CID_SMIAPP_TEST_PATTERN_GREENB	(V4L2_CID_USER_SMIAPP_BASE |
> >> 0x04)
> > 
> > Wouldn't it make sense to create a standard test pattern color control
> > instead ? Several sensors can control the test pattern color in a way or
> > another. Some of them might need more than one color though, so I'm not
> > sure how much standardization would be possible.
> 
> Now that you mention it, I'd guess many raw bayer sensors can set
> colours for the test pattern (or image). The menu control has no
> standardised values so I didn't think of standardising controls that
> depend on it.
> 
> I'll update the patches (and add a new one for the standard controls).

The color format might differ between devices though, some might not be able 
to differentiate between Gr and Gb for the test pattern. A standard test 
pattern color control should thus be flexible in the color format I suppose.

-- 
Regards,

Laurent Pinchart