kbled: Check if using white or RGB keyboard

Use RGBKB-DET# to determine the type of keyboard connected.

If a white keyboard is attached, always set the color to white, and
always return white for the color.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/board/system76/common/include/board/kbled.h

@@ -5,6 +5,13 @@
 
 #include <stdint.h>
 
+enum KbledKind {
+    KBLED_NONE = 0,
+    KBLED_WHITE = 1,
+    KBLED_RGB = 2,
+};
+extern enum KbledKind kbled_kind;
+
 // Must be specified by board
 void kbled_init(void);
 void kbled_reset(void);

src/board/system76/common/kbled.c

@@ -3,6 +3,8 @@
 #include <board/kbled.h>
 #include <common/macro.h>
 
+enum KbledKind kbled_kind = KBLED_NONE;
+
 // clang-format off
 static uint8_t LEVEL_I = 1;
 static const uint8_t __code LEVELS[] = {

src/board/system76/common/kbled/bonw14.c

@@ -7,6 +7,8 @@
 #include <ec/smbus.h>
 
 void kbled_init(void) {
+    kbled_kind = KBLED_RGB;
+
     i2c_reset(&I2C_DGPU, true);
 
     // Force SMBUS B design to 100kHZ

src/board/system76/common/kbled/darp5.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 #include <arch/delay.h>
+#include <board/gpio.h>
 #include <board/kbled.h>
 #include <common/macro.h>
 #include <ec/i2c.h>
@@ -9,6 +10,12 @@
 #define kbled_i2c_set(A, D, L) i2c_set(&I2C_KBLED, 0x68, A, D, L)
 
 void kbled_init(void) {
+    if (!gpio_get(&RGBKB_DET_N)) {
+        kbled_kind = KBLED_RGB;
+    } else {
+        kbled_kind = KBLED_WHITE;
+    }
+
     i2c_reset(&I2C_KBLED, true);
 }
 
@@ -48,6 +55,9 @@ void kbled_set(uint8_t level) {
 }
 
 uint32_t kbled_get_color(void) {
+    if (kbled_kind == KBLED_WHITE)
+        return 0xFFFFFF;
+
     // Get blue component from channel 0
     uint8_t value;
     kbled_i2c_get(0x02, &value, 1);
@@ -65,6 +75,9 @@ uint32_t kbled_get_color(void) {
 }
 
 void kbled_set_color(uint32_t color) {
+    if (kbled_kind == KBLED_WHITE)
+        color = 0xFFFFFF;
+
     // Set channel 0 - 2 to blue component
     uint8_t value = (uint8_t)(color);
     kbled_i2c_set(0x02, &value, 1);

src/board/system76/common/kbled/oryp5.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 #include <arch/delay.h>
+#include <board/gpio.h>
 #include <board/kbled.h>
 #include <common/macro.h>
 #include <ec/i2c.h>
@@ -9,6 +10,12 @@
 #define kbled_i2c_set(A, D, L) i2c_set(&I2C_KBLED, 0x68, A, D, L)
 
 void kbled_init(void) {
+    if (!gpio_get(&RGBKB_DET_N)) {
+        kbled_kind = KBLED_RGB;
+    } else {
+        kbled_kind = KBLED_WHITE;
+    }
+
     i2c_reset(&I2C_KBLED, true);
 }
 
@@ -48,6 +55,9 @@ void kbled_set(uint8_t level) {
 }
 
 uint32_t kbled_get_color(void) {
+    if (kbled_kind == KBLED_WHITE)
+        return 0xFFFFFF;
+
     // Get blue component
     uint8_t value;
     kbled_i2c_get(0x02, &value, 1);
@@ -65,6 +75,9 @@ uint32_t kbled_get_color(void) {
 }
 
 void kbled_set_color(uint32_t color) {
+    if (kbled_kind == KBLED_WHITE)
+        color = 0xFFFFFF;
+
     // Set blue component
     uint8_t value = (uint8_t)(color);
     kbled_i2c_set(0x02, &value, 1);

src/board/system76/common/kbled/rgb_pwm.c

@@ -1,9 +1,16 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
+#include <board/gpio.h>
 #include <board/kbled.h>
 #include <ec/pwm.h>
 
 void kbled_init(void) {
+    if (!gpio_get(&RGBKB_DET_N)) {
+        kbled_kind = KBLED_RGB;
+    } else {
+        kbled_kind = KBLED_WHITE;
+    }
+
     //TODO: enable PWMs
     kbled_reset();
 }
@@ -29,6 +36,9 @@ void kbled_set(uint8_t level) {
 }
 
 uint32_t kbled_get_color(void) {
+    if (kbled_kind == KBLED_WHITE)
+        return 0xFFFFFF;
+
     // Get PWM of blue component
     uint32_t color = (uint32_t)DCR7;
 
@@ -42,6 +52,9 @@ uint32_t kbled_get_color(void) {
 }
 
 void kbled_set_color(uint32_t color) {
+    if (kbled_kind == KBLED_WHITE)
+        color = 0xFFFFFF;
+
     // Set PWM for blue component
     DCR7 = (uint8_t)(color);
 

src/board/system76/common/kbled/white_dac.c

@@ -22,6 +22,8 @@ static uint8_t __code levels[] = {
 // clang-format on
 
 void kbled_init(void) {
+    kbled_kind = KBLED_WHITE;
+
     // Enable DAC used for KBLIGHT_ADJ
     DACPDREG &= ~BIT(KBLED_DAC);
     kbled_reset();