linux-kernel - Re: [PATCH v6 10/11] Input: synaptics-rmi4

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Date:	Fri, 1 Jul 2016 09:41:24 +0100
From:	Nick Dyer <nick@...anahar.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Hans Verkuil <hverkuil@...all.nl>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Benson Leung <bleung@...omium.org>,
	Alan Bowens <Alan.Bowens@...el.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Chris Healy <cphealy@...il.com>,
	Henrik Rydberg <rydberg@...math.org>,
	Andrew Duggan <aduggan@...aptics.com>,
	James Chen <james.chen@....com.tw>,
	Dudley Du <dudl@...ress.com>,
	Andrew de los Reyes <adlr@...omium.org>,
	sheckylin@...omium.org, Peter Hutterer <peter.hutterer@...-t.net>,
	Florian Echtler <floe@...terbrot.org>, mchehab@....samsung.com,
	jon.older@...ev.co.uk, nick.dyer@...ev.co.uk
Subject: Re: [PATCH v6 10/11] Input: synaptics-rmi4 - add support for F54
 diagnostics

On Thu, Jun 30, 2016 at 06:38:53PM +0100, Nick Dyer wrote:
> Function 54 implements access to various RMI4 diagnostic features.
> 
> This patch adds support for retrieving this data. It registers a V4L2
> device to output the data to user space.
> 
> Signed-off-by: Nick Dyer <nick@...anahar.org>
> ---
>  drivers/input/rmi4/Kconfig      |  11 +
>  drivers/input/rmi4/Makefile     |   1 +
>  drivers/input/rmi4/rmi_bus.c    |   3 +
>  drivers/input/rmi4/rmi_driver.h |   1 +
>  drivers/input/rmi4/rmi_f54.c    | 754 ++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 770 insertions(+)
>  create mode 100644 drivers/input/rmi4/rmi_f54.c
[...]
> index 0000000..2361157
> --- /dev/null
> +++ b/drivers/input/rmi4/rmi_f54.c
[...]
> +static int rmi_f54_vidioc_querycap(struct file *file, void *priv,
> +				   struct v4l2_capability *cap)
> +{
> +	struct f54_data *f54 = video_drvdata(file);
> +
> +	strlcpy(cap->driver, F54_NAME, sizeof(cap->driver));
> +	strlcpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card));
> +	strlcpy(cap->bus_info, dev_name(&f54->fn->dev), sizeof(cap->bus_info));

I need to correct this to prefix the bus. RMI4 registers its own bus, so
devices appear under eg /sys/bus/rmi4/devices/rmi4-00.fn54

So I will change to:
snprintf(cap->bus_info, sizeof(cap->bus_info), "rmi4:%s", dev_name(&f54->fn->dev));

And I will need to add rmi4 to the valid prefixes in v4l2-complaince as well.

> +
> +	return 0;
> +}