linux-kernel - Re: [PATCH 2/4] Documentation: Add evdev type and code definitions

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Date:	Fri, 17 Dec 2010 13:18:26 +0300
From:	Nikolai Kondrashov <spbnick@...il.com>
To:	Chase Douglas <chase.douglas@...onical.com>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Chris Bagwell <chris@...bagwell.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] Documentation: Add evdev type and code definitions

Hi Chase,

Thank you for this work :)

On 12/15/2010 12:21 AM, Chase Douglas wrote:
> +* BTN_TOOL_<name>, BTN_TOUCH:
> +  - These codes are used in conjunction with input trackpads, tablets, and
> +    touchscreens. These devices may be used with fingers, pens, or other tools.
> +    When an event occurs and a tool is used, the corresponding BTN_TOOL_<name>
> +    code should be set to a value of 1. When the tool is no longer interacting
> +    with the input device, the BTN_TOOL_<name>  code should be reset to 0. All
> +    trackpads, tablets, and touchscreens should use at least one BTN_TOOL_<name>
> +    code when events are generated. For non-tablet devices, the tool is usually
> +    BTN_TOUCH.
One minor note: some cheap tablets don't send any BTN_TOOL_*, but only a
BTN_TOUCH. These include UC-Logic tablets (drivers/hid/hid-uclogic.c).

Sincerely,
Nick
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