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Let's configure the keypad in a way where it's usable out of the box for Linux console use. We want to have the keyboard usable with Linux console for example when stuck into an initramfs during boot, for when installing a distro. As we need to need to have keys mapped in the user space anyways for some of the keys to match the labels, this non-standard mapping or usability should be OK. Some keys don't match the labels either as they don't follow the PC keyboard style. For example we have "shift + ," produce "<", and "shift + ." produce ">" instead of ";" and ":". So let's follow the standard PC keyboard layout for ctrl, shift and alt keys: Ctrl = what is labeled as shift Alt = what is labeled as SYM Shift = what is lableled as caps lock This way we have Ctrl key for console use. Who knows where they got the caps lock idea.. Probably from some focus group popularity vote or something. For the OK key, let's keep it as the useless KEY_OK unless we can come up with some standard mapping for it we can stick with. We have at least Esc, Delete, Meta, and Page Down keys missing, but none of them seem to be better than others. PC keyboard often has Page Down in that location. Esc would be probably the most usable one when installing a Linux distro but is the opposite of OK. Note that the LCD keys are just touchscreen hot spots, so I'm not sure if the driver or hardware allows setting them up as keys for the console. Anyways, the rest can be mapped in the user space. Cc: Marcel Partap <mpartap@gmx.net> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Scott <michael.scott@linaro.org> Tested-By: Sebastian Reichel <sre@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.