chip/stm32/usb_hid_keyboard: Add functions for keyscan

This first cleans up the code:
 - Define report as a structure.
 - Fix USB interval from 40 ms to 32 ms (Linux kernel complains
   otherwise).

Then, this removes the old set_keyboard_report interface, and
replaces it by the interface used by the keyboard scanner
(i.e. keyboard_state_changed and keyboard_clear_buffer).

This also means we need a keycode table to translate from
row/column to USB HID keycode.

BRANCH=none
BUG=chrome-os-partner:59083
TEST=make buildall -j
TEST=make BOARD=hammer -j && util/flash_ec --board=hammer
     With evtest and "hid 0-7" in console, check that key are
     reported correctly.

Change-Id: I5d526db1568c29c7f28fc5e962e213e44303cc16
Reviewed-on: https://chromium-review.googlesource.com/411571
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

0 files changed, 0 insertions, 0 deletions