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| author | Philip Chen <philipchen@chromium.org> | 2021-02-22 21:05:04 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2021-02-22 21:22:15 -0800 |
| commit | 820c8727956da82b7a841c299fabb2fdca9a37d4 (patch) | |
| tree | da79002995173e09e7799e9e6a4f448823fc5ce2 /Documentation/ABI | |
| parent | 311a27da6271394afdca5773f4272eb6f48fae2d (diff) | |
| download | linux-820c8727956da82b7a841c299fabb2fdca9a37d4.tar.bz2 | |
Input: cros-ec-keyb - expose function row physical map to userspace
The top-row keys in a keyboard usually have dual functionalities.
E.g. A function key "F1" is also an action key "Browser back".
Therefore, when an application receives an action key code from
a top-row key press, the application needs to know how to correlate
the action key code with the function key code and do the conversion
whenever necessary.
Since the userpace already knows the key scanlines (row/column)
associated with a received key code. Essentially, the userspace only
needs a mapping between the key row/column and the matching physical
location in the top row.
So, enhance the cros-ec-keyb driver to create such a mapping
and expose it to userspace in the form of a function_row_physmap
attribute. The attribute would be a space separated ordered list of
row/column codes for the keys in the function row, in a left-to-right
order.
The attribute will only be present when the device has a custom design
for the top-row keys.
Signed-off-by: Philip Chen <philipchen@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20210115122412.v7.2.I6542d7d9d0b246e7079bb16b41e697b2ac4b4e39@changeid
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-input-cros-ec-keyb | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-input-cros-ec-keyb b/Documentation/ABI/testing/sysfs-driver-input-cros-ec-keyb new file mode 100644 index 000000000000..c7afc2328045 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-input-cros-ec-keyb @@ -0,0 +1,6 @@ +What: /sys/class/input/input(x)/device/function_row_physmap +Date: January 2021 +Contact: Philip Chen <philipchen@chromium.org> +Description: A space separated list of scancodes for the top row keys, + ordered by the physical positions of the keys, from left + to right. |