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dm: button: support remapping phone keys

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We don't have audio support in U-Boot, but we do have boot menus. Add an
option to re-map the volume and power buttons to up/down/enter so that
in situations where these are the only available buttons (such as on
mobile phones) it's still possible to navigate menus built in U-Boot or
an external EFI app like GRUB or systemd-boot.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
This commit is contained in:
Caleb Connolly 2024-07-14 21:49:19 +02:00 • committed by Tom Rini
parent c71d451033
commit cae243927f
2 changed files with 32 additions and 1 deletions
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11
drivers/button/Kconfig
View file

@ -9,6 +9,17 @@ config BUTTON
can provide access to board-specific buttons. Use of the device tree
for configuration is encouraged.
config BUTTON_REMAP_PHONE_KEYS
bool "Remap phone keys for navigation"
depends on BUTTON
help
Enable remapping of phone keys to navigation keys. This is useful for
devices with phone keys that are not used in U-Boot. The phone keys
are remapped to the following navigation keys:
- Volume up: Up
- Volume down: Down
- Power: Enter
config BUTTON_ADC
bool "Button adc"
depends on BUTTON

22
drivers/button/button-uclass.c
View file

@ -10,6 +10,7 @@
#include <button.h>
#include <dm.h>
#include <dm/uclass-internal.h>
#include <dt-bindings/input/linux-event-codes.h>
int button_get_by_label(const char *label, struct udevice **devp)
{
@ -37,14 +38,33 @@ enum button_state_t button_get_state(struct udevice *dev)
return ops->get_state(dev);
}
static int button_remap_phone_keys(int code)
{
switch (code) {
case KEY_VOLUMEUP:
return KEY_UP;
case KEY_VOLUMEDOWN:
return KEY_DOWN;
case KEY_POWER:
return KEY_ENTER;
default:
return code;
}
}
int button_get_code(struct udevice *dev)
{
struct button_ops *ops = button_get_ops(dev);
int code;
if (!ops->get_code)
return -ENOSYS;
return ops->get_code(dev);
code = ops->get_code(dev);
if (CONFIG_IS_ENABLED(BUTTON_REMAP_PHONE_KEYS))
return button_remap_phone_keys(code);
else
return code;
}
UCLASS_DRIVER(button) = {