Add VIA support for QMK backlight, QMK RGBLight (#7911)

* Add VIA support for QMK backlight, QMK RGBLight

* clang-format changes

6 files changed, 260 insertions, 28 deletions

diff --git a/quantum/backlight/backlight.c b/quantum/backlight/backlight.c
index e57b31d10..4aa74667d 100644
--- a/quantum/backlight/backlight.c
+++ b/quantum/backlight/backlight.c
@@ -130,18 +130,30 @@ void backlight_step(void) {
     backlight_set(backlight_config.level);
 }
 
-/** \brief Backlight set level
+/** \brief Backlight set level without EEPROM update
  *
- * FIXME: needs doc
  */
-void backlight_level(uint8_t level) {
+void backlight_level_noeeprom(uint8_t level) {
     if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS;
     backlight_config.level  = level;
     backlight_config.enable = !!backlight_config.level;
-    eeconfig_update_backlight(backlight_config.raw);
     backlight_set(backlight_config.level);
 }
 
+/** \brief Backlight set level
+ *
+ * FIXME: needs doc
+ */
+void backlight_level(uint8_t level) {
+    backlight_level_noeeprom(level);
+    eeconfig_update_backlight(backlight_config.raw);
+}
+
+/** \brief Update current backlight state to EEPROM
+ *
+ */
+void eeconfig_update_backlight_current(void) { eeconfig_update_backlight(backlight_config.raw); }
+
 /** \brief Get backlight level
  *
  * FIXME: needs doc
diff --git a/quantum/backlight/backlight.h b/quantum/backlight/backlight.h
index 9f0a5e81d..08acf942f 100644
--- a/quantum/backlight/backlight.h
+++ b/quantum/backlight/backlight.h
@@ -48,8 +48,10 @@ bool    is_backlight_enabled(void);
 void    backlight_step(void);
 void    backlight_increase(void);
 void    backlight_decrease(void);
+void    backlight_level_noeeprom(uint8_t level);
 void    backlight_level(uint8_t level);
 uint8_t get_backlight_level(void);
+void    eeconfig_update_backlight_current(void);
 
 // implementation specific
 void backlight_init_ports(void);
diff --git a/quantum/rgblight.c b/quantum/rgblight.c
index 26887f057..85b319110 100644
--- a/quantum/rgblight.c
+++ b/quantum/rgblight.c
@@ -160,6 +160,10 @@ void eeconfig_update_rgblight(uint32_t val) {
 #endif
 }
 
+void eeconfig_update_rgblight_current(void) {
+    eeconfig_update_rgblight(rgblight_config.raw);
+}
+
 void eeconfig_update_rgblight_default(void) {
     rgblight_config.enable = 1;
     rgblight_config.mode   = RGBLIGHT_MODE_STATIC_LIGHT;
@@ -501,6 +505,22 @@ void rgblight_sethsv(uint8_t hue, uint8_t sat, uint8_t val) { rgblight_sethsv_ee
 
 void rgblight_sethsv_noeeprom(uint8_t hue, uint8_t sat, uint8_t val) { rgblight_sethsv_eeprom_helper(hue, sat, val, false); }
 
+uint8_t rgblight_get_speed(void) { return rgblight_config.speed; }
+
+void rgblight_set_speed_eeprom_helper(uint8_t speed, bool write_to_eeprom) {
+    rgblight_config.speed = speed;
+    if (write_to_eeprom) {
+        eeconfig_update_rgblight(rgblight_config.raw);   // EECONFIG needs to be increased to support this
+        dprintf("rgblight set speed [EEPROM]: %u\n", rgblight_config.speed);
+    } else {
+        dprintf("rgblight set speed [NOEEPROM]: %u\n", rgblight_config.speed);
+    }
+}
+
+void rgblight_set_speed(uint8_t speed) { rgblight_set_speed_eeprom_helper(speed, true); }
+
+void rgblight_set_speed_noeeprom(uint8_t speed) { rgblight_set_speed_eeprom_helper(speed, false); }
+
 uint8_t rgblight_get_hue(void) { return rgblight_config.hue; }
 
 uint8_t rgblight_get_sat(void) { return rgblight_config.sat; }
diff --git a/quantum/rgblight.h b/quantum/rgblight.h
index e3aa098e4..f6746e50f 100644
--- a/quantum/rgblight.h
+++ b/quantum/rgblight.h
@@ -233,6 +233,11 @@ void rgblight_decrease_speed(void);
 void rgblight_sethsv(uint8_t hue, uint8_t sat, uint8_t val);
 void rgblight_sethsv_noeeprom(uint8_t hue, uint8_t sat, uint8_t val);
 
+/*   effect speed */
+uint8_t rgblight_get_speed(void);
+void rgblight_set_speed(uint8_t speed);
+void rgblight_set_speed_noeeprom(uint8_t speed);
+
 /*       query */
 uint8_t rgblight_get_mode(void);
 uint8_t rgblight_get_hue(void);
@@ -245,6 +250,7 @@ uint32_t rgblight_read_dword(void);
 void     rgblight_update_dword(uint32_t dword);
 uint32_t eeconfig_read_rgblight(void);
 void     eeconfig_update_rgblight(uint32_t val);
+void     eeconfig_update_rgblight_current(void);
 void     eeconfig_update_rgblight_default(void);
 void     eeconfig_debug_rgblight(void);
 
diff --git a/quantum/via.c b/quantum/via.c
index b3934d9f0..f85af8d9e 100644
--- a/quantum/via.c
+++ b/quantum/via.c
@@ -22,14 +22,42 @@
 #    error "DYNAMIC_KEYMAP_ENABLE is not enabled"
 #endif
 
+// If VIA_CUSTOM_LIGHTING_ENABLE is not defined, then VIA_QMK_BACKLIGHT_ENABLE is set
+// if BACKLIGHT_ENABLE is set, so handling of QMK Backlight values happens here by default.
+// if VIA_CUSTOM_LIGHTING_ENABLE is defined, then VIA_QMK_BACKLIGHT_ENABLE must be explicitly
+// set in keyboard-level config.h, so handling of QMK Backlight values happens here
+#if defined(BACKLIGHT_ENABLE) && !defined(VIA_CUSTOM_LIGHTING_ENABLE)
+#    define VIA_QMK_BACKLIGHT_ENABLE
+#endif
+
+// If VIA_CUSTOM_LIGHTING_ENABLE is not defined, then VIA_QMK_RGBLIGHT_ENABLE is set
+// if RGBLIGHT_ENABLE is set, so handling of QMK RGBLIGHT values happens here by default.
+// If VIA_CUSTOM_LIGHTING_ENABLE is defined, then VIA_QMK_RGBLIGHT_ENABLE must be explicitly
+// set in keyboard-level config.h, so handling of QMK RGBLIGHT values happens here
+#if defined(RGBLIGHT_ENABLE) && !defined(VIA_CUSTOM_LIGHTING_ENABLE)
+#    define VIA_QMK_RGBLIGHT_ENABLE
+#endif
+
 #include "quantum.h"
 
 #include "via.h"
+
 #include "raw_hid.h"
 #include "dynamic_keymap.h"
 #include "tmk_core/common/eeprom.h"
 #include "version.h"  // for QMK_BUILDDATE used in EEPROM magic
 
+// Forward declare some helpers.
+#if defined(VIA_QMK_BACKLIGHT_ENABLE)
+void via_qmk_backlight_set_value(uint8_t *data);
+void via_qmk_backlight_get_value(uint8_t *data);
+#endif
+
+#if defined(VIA_QMK_RGBLIGHT_ENABLE)
+void via_qmk_rgblight_set_value(uint8_t *data);
+void via_qmk_rgblight_get_value(uint8_t *data);
+#endif
+
 // Can be called in an overriding via_init_kb() to test if keyboard level code usage of
 // EEPROM is invalid and use/save defaults.
 bool via_eeprom_is_valid(void) {
@@ -282,10 +310,52 @@ void raw_hid_receive(uint8_t *data, uint8_t length) {
             dynamic_keymap_reset();
             break;
         }
-        case id_backlight_config_set_value:
-        case id_backlight_config_get_value:
-        case id_backlight_config_save: {
+        case id_lighting_set_value: {
+#if defined(VIA_QMK_BACKLIGHT_ENABLE)
+            via_qmk_backlight_set_value(command_data);
+#endif
+#if defined(VIA_QMK_RGBLIGHT_ENABLE)
+            via_qmk_rgblight_set_value(command_data);
+#endif
+#if defined(VIA_CUSTOM_LIGHTING_ENABLE)
             raw_hid_receive_kb(data, length);
+#endif
+#if !defined(VIA_QMK_BACKLIGHT_ENABLE) && !defined(VIA_QMK_RGBLIGHT_ENABLE) && !defined(VIA_CUSTOM_LIGHTING_ENABLE)
+            // Return the unhandled state
+            *command_id = id_unhandled;
+#endif
+            break;
+        }
+        case id_lighting_get_value: {
+#if defined(VIA_QMK_BACKLIGHT_ENABLE)
+            via_qmk_backlight_get_value(command_data);
+#endif
+#if defined(VIA_QMK_RGBLIGHT_ENABLE)
+            via_qmk_rgblight_get_value(command_data);
+#endif
+#if defined(VIA_CUSTOM_LIGHTING_ENABLE)
+            raw_hid_receive_kb(data, length);
+#endif
+#if !defined(VIA_QMK_BACKLIGHT_ENABLE) && !defined(VIA_QMK_RGBLIGHT_ENABLE) && !defined(VIA_CUSTOM_LIGHTING_ENABLE)
+            // Return the unhandled state
+            *command_id = id_unhandled;
+#endif
+            break;
+        }
+        case id_lighting_save: {
+#if defined(VIA_QMK_BACKLIGHT_ENABLE)
+            eeconfig_update_backlight_current();
+#endif
+#if defined(VIA_QMK_RGBLIGHT_ENABLE)
+            eeconfig_update_rgblight_current();
+#endif
+#if defined(VIA_CUSTOM_LIGHTING_ENABLE)
+            raw_hid_receive_kb(data, length);
+#endif
+#if !defined(VIA_QMK_BACKLIGHT_ENABLE) && !defined(VIA_QMK_RGBLIGHT_ENABLE) && !defined(VIA_CUSTOM_LIGHTING_ENABLE)
+            // Return the unhandled state
+            *command_id = id_unhandled;
+#endif
             break;
         }
         case id_dynamic_keymap_macro_get_count: {
@@ -355,3 +425,109 @@ void raw_hid_receive(uint8_t *data, uint8_t length) {
     // (i.e. returning state to the host, or the unhandled state).
     raw_hid_send(data, length);
 }
+
+#if defined(VIA_QMK_BACKLIGHT_ENABLE)
+
+#    if BACKLIGHT_LEVELS == 0
+#        error BACKLIGHT_LEVELS == 0
+#    endif
+
+void via_qmk_backlight_get_value(uint8_t *data) {
+    uint8_t *value_id   = &(data[0]);
+    uint8_t *value_data = &(data[1]);
+    switch (*value_id) {
+        case id_qmk_backlight_brightness: {
+            // level / BACKLIGHT_LEVELS * 255
+            value_data[0] = ((uint16_t)get_backlight_level()) * 255 / BACKLIGHT_LEVELS;
+            break;
+        }
+        case id_qmk_backlight_effect: {
+#    ifdef BACKLIGHT_BREATHING
+            value_data[0] = is_backlight_breathing() ? 1 : 0;
+#    else
+            value_data[0] = 0;
+#    endif
+            break;
+        }
+    }
+}
+
+void via_qmk_backlight_set_value(uint8_t *data) {
+    uint8_t *value_id   = &(data[0]);
+    uint8_t *value_data = &(data[1]);
+    switch (*value_id) {
+        case id_qmk_backlight_brightness: {
+            // level / 255 * BACKLIGHT_LEVELS
+            backlight_level_noeeprom(((uint16_t)value_data[0]) * BACKLIGHT_LEVELS / 255);
+            break;
+        }
+        case id_qmk_backlight_effect: {
+#    ifdef BACKLIGHT_BREATHING
+            if (value_data[0] == 0) {
+                backlight_disable_breathing();
+            } else {
+                backlight_enable_breathing();
+            }
+#    endif
+            break;
+        }
+    }
+}
+
+#endif  // #if defined(VIA_QMK_BACKLIGHT_ENABLE)
+
+#if defined(VIA_QMK_RGBLIGHT_ENABLE)
+
+void via_qmk_rgblight_get_value(uint8_t *data) {
+    uint8_t *value_id   = &(data[0]);
+    uint8_t *value_data = &(data[1]);
+    switch (*value_id) {
+        case id_qmk_rgblight_brightness: {
+            value_data[0] = rgblight_get_val();
+            break;
+        }
+        case id_qmk_rgblight_effect: {
+            value_data[0] = rgblight_get_mode();
+            break;
+        }
+        case id_qmk_rgblight_effect_speed: {
+            value_data[0] = rgblight_get_speed();
+            break;
+        }
+        case id_qmk_rgblight_color: {
+            value_data[0] = rgblight_get_hue();
+            value_data[1] = rgblight_get_sat();
+            break;
+        }
+    }
+}
+
+void via_qmk_rgblight_set_value(uint8_t *data) {
+    uint8_t *value_id   = &(data[0]);
+    uint8_t *value_data = &(data[1]);
+    switch (*value_id) {
+        case id_qmk_rgblight_brightness: {
+            rgblight_sethsv_noeeprom(rgblight_get_hue(), rgblight_get_sat(), value_data[0]);
+            break;
+        }
+        case id_qmk_rgblight_effect: {
+            rgblight_mode_noeeprom(value_data[0]);
+            if (value_data[0] == 0) {
+                rgblight_disable_noeeprom();
+            } else {
+                rgblight_enable_noeeprom();
+            }
+            break;
+        }
+        case id_qmk_rgblight_effect_speed: {
+            rgblight_set_speed_noeeprom(value_data[0]);
+            break;
+        }
+        case id_qmk_rgblight_color: {
+            rgblight_sethsv_noeeprom(value_data[0], value_data[1], rgblight_get_val());
+            break;
+        }
+    }
+}
+
+#endif  // #if defined(VIA_QMK_RGBLIGHT_ENABLE)
diff --git a/quantum/via.h b/quantum/via.h
index 98f8dea8c..012547e05 100644
--- a/quantum/via.h
+++ b/quantum/via.h
@@ -51,29 +51,45 @@
 #define VIA_PROTOCOL_VERSION 0x0009
 
 enum via_command_id {
-    id_get_protocol_version = 0x01,  // always 0x01
-    id_get_keyboard_value,
-    id_set_keyboard_value,
-    id_dynamic_keymap_get_keycode,
-    id_dynamic_keymap_set_keycode,
-    id_dynamic_keymap_reset,
-    id_backlight_config_set_value,
-    id_backlight_config_get_value,
-    id_backlight_config_save,
-    id_eeprom_reset,
-    id_bootloader_jump,
-    id_dynamic_keymap_macro_get_count,
-    id_dynamic_keymap_macro_get_buffer_size,
-    id_dynamic_keymap_macro_get_buffer,
-    id_dynamic_keymap_macro_set_buffer,
-    id_dynamic_keymap_macro_reset,
-    id_dynamic_keymap_get_layer_count,
-    id_dynamic_keymap_get_buffer,
-    id_dynamic_keymap_set_buffer,
-    id_unhandled = 0xFF,
+    id_get_protocol_version                 = 0x01,  // always 0x01
+    id_get_keyboard_value                   = 0x02,
+    id_set_keyboard_value                   = 0x03,
+    id_dynamic_keymap_get_keycode           = 0x04,
+    id_dynamic_keymap_set_keycode           = 0x05,
+    id_dynamic_keymap_reset                 = 0x06,
+    id_lighting_set_value                   = 0x07,
+    id_lighting_get_value                   = 0x08,
+    id_lighting_save                        = 0x09,
+    id_eeprom_reset                         = 0x0A,
+    id_bootloader_jump                      = 0x0B,
+    id_dynamic_keymap_macro_get_count       = 0x0C,
+    id_dynamic_keymap_macro_get_buffer_size = 0x0D,
+    id_dynamic_keymap_macro_get_buffer      = 0x0E,
+    id_dynamic_keymap_macro_set_buffer      = 0x0F,
+    id_dynamic_keymap_macro_reset           = 0x10,
+    id_dynamic_keymap_get_layer_count       = 0x11,
+    id_dynamic_keymap_get_buffer            = 0x12,
+    id_dynamic_keymap_set_buffer            = 0x13,
+    id_unhandled                            = 0xFF,
 };
 
-enum via_keyboard_value_id { id_uptime = 0x01, id_layout_options, id_switch_matrix_state };
+enum via_keyboard_value_id {
+    id_uptime              = 0x01,  //
+    id_layout_options      = 0x02,
+    id_switch_matrix_state = 0x03
+};
+
+enum via_lighting_value {
+    // QMK BACKLIGHT
+    id_qmk_backlight_brightness = 0x09,
+    id_qmk_backlight_effect     = 0x0A,
+
+    // QMK RGBLIGHT
+    id_qmk_rgblight_brightness   = 0x80,
+    id_qmk_rgblight_effect       = 0x81,
+    id_qmk_rgblight_effect_speed = 0x82,
+    id_qmk_rgblight_color        = 0x83,
+};
 
 // Can't use SAFE_RANGE here, it might change if someone adds
 // new values to enum quantum_keycodes.