Add a new led driver for Keychron's keyboards.

common_features.mk

@@ -232,7 +232,7 @@ endif
 endif
 
 RGB_MATRIX_ENABLE ?= no
-VALID_RGB_MATRIX_TYPES := AW20216 IS31FL3731 IS31FL3733 IS31FL3737 IS31FL3741 WS2812 custom
+VALID_RGB_MATRIX_TYPES := AW20216 IS31FL3731 IS31FL3733 IS31FL3737 IS31FL3741 CKLED2001 WS2812 custom
 
 ifeq ($(strip $(RGB_MATRIX_ENABLE)), yes)
     ifeq ($(filter $(RGB_MATRIX_DRIVER),$(VALID_RGB_MATRIX_TYPES)),)
@@ -288,6 +288,13 @@ endif
         QUANTUM_LIB_SRC += i2c_master.c
     endif
 
+    ifeq ($(strip $(RGB_MATRIX_DRIVER)), CKLED2001)
+        OPT_DEFS += -DCKLED2001 -DSTM32_I2C -DHAL_USE_I2C=TRUE
+        COMMON_VPATH += $(DRIVER_PATH)/led
+        SRC += ckled2001.c
+        QUANTUM_LIB_SRC += i2c_master.c
+    endif
+
     ifeq ($(strip $(RGB_MATRIX_DRIVER)), WS2812)
         OPT_DEFS += -DWS2812
         WS2812_DRIVER_REQUIRED := yes

drivers/led/ckled2001.c

@@ -0,0 +1,226 @@
+/* Copyright 2021 @ Keychron (https://www.keychron.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ckled2001.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+#ifndef CKLED2001_TIMEOUT
+#    define CKLED2001_TIMEOUT 100
+#endif
+
+#ifndef CKLED2001_PERSISTENCE
+#    define CKLED2001_PERSISTENCE 0
+#endif
+
+#ifndef PHASE_CHANNEL
+#    define PHASE_CHANNEL MSKPHASE_12CHANNEL
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the CKLED2001 PWM registers.
+// The control buffers match the PG0 LED On/Off registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in CKLED2001_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[DRIVER_COUNT][192];
+bool    g_pwm_buffer_update_required[DRIVER_COUNT] = {false};
+
+uint8_t g_led_control_registers[DRIVER_COUNT][24]             = {0};
+bool    g_led_control_registers_update_required[DRIVER_COUNT] = {false};
+
+bool CKLED2001_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    // If the transaction fails function returns false.
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if CKLED2001_PERSISTENCE > 0
+    for (uint8_t i = 0; i < CKLED2001_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, CKLED2001_TIMEOUT) != 0) {
+            return false;
+        }
+    }
+#else
+    if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, CKLED2001_TIMEOUT) != 0) {
+        return false;
+    }
+#endif
+    return true;
+}
+
+bool CKLED2001_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // Assumes PG1 is already selected.
+    // If any of the transactions fails function returns false.
+    // Transmit PWM registers in 12 transfers of 16 bytes.
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // Iterate over the pwm_buffer contents at 16 byte intervals.
+    for (int i = 0; i < 192; i += 16) {
+        g_twi_transfer_buffer[0] = i;
+        // Copy the data from i to i+15.
+        // Device will auto-increment register for data after the first byte
+        // Thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer.
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if CKLED2001_PERSISTENCE > 0
+        for (uint8_t i = 0; i < CKLED2001_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, CKLED2001_TIMEOUT) != 0) {
+                return false;
+            }
+        }
+#else
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, CKLED2001_TIMEOUT) != 0) {
+            return false;
+        }
+#endif
+    }
+    return true;
+}
+
+void CKLED2001_init(uint8_t addr) {
+    // Select to function page
+    CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, FUNCTION_PAGE);
+    // Setting LED driver to shutdown mode
+    CKLED2001_write_register(addr, CONFIGURATION_REG, MSKSW_SHUT_DOWN_MODE);
+    // Setting internal channel pulldown/pullup
+    CKLED2001_write_register(addr, PDU_REG, MSKSET_CA_CB_CHANNEL);
+    // Select number of scan phase
+    CKLED2001_write_register(addr, SCAN_PHASE_REG, PHASE_CHANNEL);
+    // Setting PWM Delay Phase
+    CKLED2001_write_register(addr, SLEW_RATE_CONTROL_MODE1_REG, MSKPWM_DELAY_PHASE_ENABLE);
+    // Setting Driving/Sinking Channel Slew Rate
+    CKLED2001_write_register(addr, SLEW_RATE_CONTROL_MODE2_REG, MSKDRIVING_SINKING_CHHANNEL_SLEWRATE_ENABLE);
+    // Setting Iref
+    CKLED2001_write_register(addr, SOFTWARE_SLEEP_REG, MSKSLEEP_DISABLE);
+    // Set LED CONTROL PAGE (Page 0)
+    CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, LED_CONTROL_PAGE);
+    for (int i = 0; i < LED_CONTROL_ON_OFF_LENGTH; i++) {
+        CKLED2001_write_register(addr, i, 0x00);
+    }
+
+    // Set PWM PAGE (Page 1)
+    CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, LED_PWM_PAGE);
+    for (int i = 0; i < LED_CURRENT_TUNE_LENGTH; i++) {
+        CKLED2001_write_register(addr, i, 0x00);
+    }
+
+    // Set CURRENT PAGE (Page 4)
+    CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, CURRENT_TUNE_PAGE);
+    for (int i = 0; i < LED_CURRENT_TUNE_LENGTH; i++) {
+        CKLED2001_write_register(addr, i, 0xFF);
+    }
+
+    // Enable LEDs ON/OFF
+    CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, LED_CONTROL_PAGE);
+    for (int i = 0; i < LED_CONTROL_ON_OFF_LENGTH; i++) {
+        CKLED2001_write_register(addr, i, 0xFF);
+    }
+
+    // Select to function page
+    CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, FUNCTION_PAGE);
+    // Setting LED driver to normal mode
+    CKLED2001_write_register(addr, CONFIGURATION_REG, MSKSW_NORMAL_MODE);
+}
+
+void CKLED2001_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        ckled2001_led led = g_ckled2001_leds[index];
+
+        g_pwm_buffer[led.driver][led.r]          = red;
+        g_pwm_buffer[led.driver][led.g]          = green;
+        g_pwm_buffer[led.driver][led.b]          = blue;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void CKLED2001_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        CKLED2001_set_color(i, red, green, blue);
+    }
+}
+
+void CKLED2001_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
+    ckled2001_led led = g_ckled2001_leds[index];
+
+    uint8_t control_register_r = led.r / 8;
+    uint8_t control_register_g = led.g / 8;
+    uint8_t control_register_b = led.b / 8;
+    uint8_t bit_r              = led.r % 8;
+    uint8_t bit_g              = led.g % 8;
+    uint8_t bit_b              = led.b % 8;
+
+    if (red) {
+        g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
+    } else {
+        g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
+    }
+    if (green) {
+        g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
+    } else {
+        g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
+    }
+    if (blue) {
+        g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
+    } else {
+        g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
+    }
+
+    g_led_control_registers_update_required[led.driver] = true;
+}
+
+void CKLED2001_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, LED_PWM_PAGE);
+
+        // If any of the transactions fail we risk writing dirty PG0,
+        // refresh page 0 just in case.
+        if (!CKLED2001_write_pwm_buffer(addr, g_pwm_buffer[index])) {
+            g_led_control_registers_update_required[index] = true;
+        }
+    }
+    g_pwm_buffer_update_required[index] = false;
+}
+
+void CKLED2001_update_led_control_registers(uint8_t addr, uint8_t index) {
+    if (g_led_control_registers_update_required[index]) {
+        CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, LED_CONTROL_PAGE);
+        for (int i = 0; i < 24; i++) {
+            CKLED2001_write_register(addr, i, g_led_control_registers[index][i]);
+        }
+    }
+    g_led_control_registers_update_required[index] = false;
+}
+
+void CKLED2001_return_normal(uint8_t addr) {
+    // Select to function page
+    CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, FUNCTION_PAGE);
+    // Setting LED driver to normal mode
+    CKLED2001_write_register(addr, CONFIGURATION_REG, MSKSW_NORMAL_MODE);
+}
+
+void CKLED2001_shutdown(uint8_t addr) {
+    // Select to function page
+    CKLED2001_write_register(addr, CONFIGURE_CMD_PAGE, FUNCTION_PAGE);
+    // Setting LED driver to shutdown mode
+    CKLED2001_write_register(addr, CONFIGURATION_REG, MSKSW_SHUT_DOWN_MODE);
+    // Write SW Sleep Register
+    CKLED2001_write_register(addr, SOFTWARE_SLEEP_REG, MSKSLEEP_ENABLE);
+}