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backlight: added LED channel map

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Adds an LED channel map devicetree binding and kconfig
to permit the use of LED driver IC for backlight.

Signed-off-by: Kelly Helmut Lord <helmut@helmutlord.com>
This commit is contained in:
Kelly Helmut Lord 2023-11-15 15:49:39 -05:00
parent 34c8b3f1e3
commit 46a5ea603f
3 changed files with 40 additions and 1 deletions
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3
app/Kconfig
View file

@ -302,6 +302,9 @@ config ZMK_BACKLIGHT_AUTO_OFF_IDLE
config ZMK_BACKLIGHT_AUTO_OFF_USB
bool "Turn off backlight when USB is disconnected"
config ZMK_BACKLIGHT_MAP
bool "Allow backlight to be mapped to LED channels"
#ZMK_BACKLIGHT
endif

9
app/dts/bindings/zmk,backlight-map.yaml Normal file
View file

@ -0,0 +1,9 @@
description: |
Allows defining a keymap composed of multiple layers
compatible: "zmk,backlight-map"
properties:
led-channels:
type: phandle-array
required: true

29
app/src/backlight.c
View file

@ -9,6 +9,7 @@
#include <zephyr/drivers/led.h>
#include <zephyr/init.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/util.h>
#include <zephyr/logging/log.h>
#include <zephyr/settings/settings.h>
@ -30,8 +31,24 @@ static const struct device *const backlight_dev = DEVICE_DT_GET(DT_CHOSEN(zmk_ba
#define CHILD_COUNT(...) +1
#define DT_NUM_CHILD(node_id) (DT_FOREACH_CHILD(node_id, CHILD_COUNT))
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_MAP)
BUILD_ASSERT(DT_HAS_CHOSEN(zmk_backlight_map),
"CONFIG_ZMK_BACKLIGHT_MAP is enabled but no zmk,backlight-map chosen node found");
#define BACKLIGHT_NUM_LEDS DT_PROP_LEN(DT_CHOSEN(zmk_backlight_map), led_channels)
#define GET_LED_CHANNEL_INDEX(idx, node_id) DT_PROP(DT_PHANDLE_BY_IDX(node_id, led_channels, idx), index)
static uint32_t backlight_map_array[] = {
LISTIFY(BACKLIGHT_NUM_LEDS, GET_LED_CHANNEL_INDEX, (,), DT_CHOSEN(zmk_backlight_map))
};
#else
#define BACKLIGHT_NUM_LEDS (DT_NUM_CHILD(DT_CHOSEN(zmk_backlight)))
#endif
#define BRT_MAX 100
struct backlight_state {
@ -44,8 +61,17 @@ static struct backlight_state state = {.brightness = CONFIG_ZMK_BACKLIGHT_BRT_ST
static int zmk_backlight_update() {
uint8_t brt = zmk_backlight_get_brt();
LOG_DBG("Length: %d", BACKLIGHT_NUM_LEDS);
LOG_DBG("Update backlight brightness: %d%%", brt);
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_MAP)
for (int i = 0; i < BACKLIGHT_NUM_LEDS; i++) {
int rc = led_set_brightness(backlight_dev, backlight_map_array[i], brt);
if (rc != 0) {
LOG_ERR("Failed to update backlight LED %d: %d", i, rc);
return rc;
}
}
#else
for (int i = 0; i < BACKLIGHT_NUM_LEDS; i++) {
int rc = led_set_brightness(backlight_dev, i, brt);
if (rc != 0) {
@ -53,6 +79,7 @@ static int zmk_backlight_update() {
return rc;
}
}
#endif
return 0;
}