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platform/chrome: cros_kbd_led_backlight: Fix build dependencies

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ccf395bde6 ("platform/chrome: cros_ec_proto: Allow to build as module")
allows CROS_EC_PROTO to be a module.

The config is possible to be:
- CONFIG_ACPI=y
- CONFIG_CROS_EC=m
- CONFIG_MFD_CROS_EC_DEV=m
- CONFIG_CROS_EC_PROTO=m
- CONFIG_CROS_KBD_LED_BACKLIGHT=y

As a result:
ld: vmlinux.o: in function `keyboard_led_set_brightness_ec_pwm':
cros_kbd_led_backlight.c:(.text+0x3554e4c): undefined reference to `cros_ec_cmd_xfer_status'
ld: vmlinux.o: in function `keyboard_led_get_brightness_ec_pwm':
cros_kbd_led_backlight.c:(.text+0x3554f41): undefined reference to `cros_ec_cmd_xfer_status'

The built-in code in CROS_KBD_LED_BACKLIGHT can't find symbols defined in
the module CROS_EC_PROTO.

Let A=ACPI (bool), M=MFD_CROS_EC_DEV (tristate), and
K=CROS_KBD_LED_BACKLIGHT (tristate).  The possible values are:

| A | M | choice for K |
------------------------
| y | y | y/m/n        |
| y | m | m/n          |
| y | n | y/m/n        |
| n | y | y/m/n        |
| n | m | m/n          |
| n | n | n            |

Fix the dependencies in the Kconfig.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Closes: https://lore.kernel.org/chrome-platform/ed8adc69-c505-4108-bf63-92911b0395c7@infradead.org/T/#u
Fixes: ccf395bde6 ("platform/chrome: cros_ec_proto: Allow to build as module")
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20250414132427.204078-3-tzungbi@kernel.org
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
This commit is contained in:
Tzung-Bi Shih 2025-04-14 21:24:27 +08:00
parent 9aea0edcc3
commit 31d3bd592d
1 changed files with 2 additions and 1 deletions
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3
drivers/platform/chrome/Kconfig
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@ -161,7 +161,8 @@ config CROS_EC_PROTO
config CROS_KBD_LED_BACKLIGHT
tristate "Backlight LED support for Chrome OS keyboards"
depends on LEDS_CLASS && (ACPI || MFD_CROS_EC_DEV)
depends on LEDS_CLASS
depends on MFD_CROS_EC_DEV || (MFD_CROS_EC_DEV=n && ACPI)
help
This option enables support for the keyboard backlight LEDs on
select Chrome OS systems.