1 files changed, 166 insertions, 0 deletions

diff --git a/drivers/awinic/aw20216.c b/drivers/awinic/aw20216.c
new file mode 100644
index 000000000..236c42a3c
--- /dev/null
+++ b/drivers/awinic/aw20216.c
@@ -0,0 +1,166 @@
+/* Copyright 2021 Jasper Chan
+ *
+ * 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 "aw20216.h"
+#include "spi_master.h"
+
+/* The AW20216 appears to be somewhat similar to the IS31FL743, although quite
+ * a few things are different, such as the command byte format and page ordering.
+ * The LED addresses start from 0x00 instead of 0x01.
+ */
+#define AWINIC_ID 0b1010 << 4
+
+#define AW_PAGE_FUNCTION 0x00 << 1    // PG0, Function registers
+#define AW_PAGE_PWM 0x01 << 1         // PG1, LED PWM control
+#define AW_PAGE_SCALING 0x02 << 1     // PG2, LED current scaling control
+#define AW_PAGE_PATCHOICE 0x03 << 1   // PG3, Pattern choice?
+#define AW_PAGE_PWMSCALING 0x04 << 1  // PG4, LED PWM + Scaling control?
+
+#define AW_WRITE 0
+#define AW_READ 1
+
+#define AW_REG_CONFIGURATION 0x00  // PG0
+#define AW_REG_GLOBALCURRENT 0x01  // PG0
+
+// Default value of AW_REG_CONFIGURATION
+// D7:D4 = 1011, SWSEL (SW1~SW12 active)
+// D3 = 0?, reserved (apparently this should be 1 but it doesn't seem to matter)
+// D2:D1 = 00, OSDE (open/short detection enable)
+// D0 = 0, CHIPEN (write 1 to enable LEDs when hardware enable pulled high)
+#define AW_CONFIG_DEFAULT 0b10110000
+#define AW_CHIPEN 1
+
+#ifndef AW_SCALING_MAX
+#    define AW_SCALING_MAX 150
+#endif
+
+#ifndef AW_GLOBAL_CURRENT_MAX
+#    define AW_GLOBAL_CURRENT_MAX 150
+#endif
+
+#ifndef DRIVER_1_CS
+#    define DRIVER_1_CS B13
+#endif
+
+#ifndef DRIVER_1_EN
+#    define DRIVER_1_EN C13
+#endif
+
+uint8_t g_spi_transfer_buffer[20] = {0};
+aw_led  g_pwm_buffer[DRIVER_LED_TOTAL];
+bool    g_pwm_buffer_update_required[DRIVER_LED_TOTAL];
+
+bool AW20216_write_register(pin_t slave_pin, uint8_t page, uint8_t reg, uint8_t data) {
+    // Do we need to call spi_stop() if this fails?
+    if (!spi_start(slave_pin, false, 0, 16)) {
+        return false;
+    }
+
+    g_spi_transfer_buffer[0] = (AWINIC_ID | page | AW_WRITE);
+    g_spi_transfer_buffer[1] = reg;
+    g_spi_transfer_buffer[2] = data;
+
+    if (spi_transmit(g_spi_transfer_buffer, 3) != SPI_STATUS_SUCCESS) {
+        spi_stop();
+        return false;
+    }
+    spi_stop();
+    return true;
+}
+
+bool AW20216_init_scaling(void) {
+    // Set constant current to the max, control brightness with PWM
+    aw_led led;
+    for (uint8_t i = 0; i < DRIVER_LED_TOTAL; i++) {
+        led = g_aw_leds[i];
+        if (led.driver == 0) {
+            AW20216_write_register(DRIVER_1_CS, AW_PAGE_SCALING, led.r, AW_SCALING_MAX);
+            AW20216_write_register(DRIVER_1_CS, AW_PAGE_SCALING, led.g, AW_SCALING_MAX);
+            AW20216_write_register(DRIVER_1_CS, AW_PAGE_SCALING, led.b, AW_SCALING_MAX);
+        }
+#ifdef DRIVER_2_CS
+        else if (led.driver == 1) {
+            AW20216_write_register(DRIVER_2_CS, AW_PAGE_SCALING, led.r, AW_SCALING_MAX);
+            AW20216_write_register(DRIVER_2_CS, AW_PAGE_SCALING, led.g, AW_SCALING_MAX);
+            AW20216_write_register(DRIVER_2_CS, AW_PAGE_SCALING, led.b, AW_SCALING_MAX);
+        }
+#endif
+    }
+    return true;
+}
+
+bool AW20216_soft_enable(void) {
+    AW20216_write_register(DRIVER_1_CS, AW_PAGE_FUNCTION, AW_REG_CONFIGURATION, AW_CONFIG_DEFAULT | AW_CHIPEN);
+#ifdef DRIVER_2_CS
+    AW20216_write_register(DRIVER_2_CS, AW_PAGE_FUNCTION, AW_REG_CONFIGURATION, AW_CONFIG_DEFAULT | AW_CHIPEN);
+#endif
+    return true;
+}
+
+void AW20216_update_pwm(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    aw_led led = g_aw_leds[index];
+    if (led.driver == 0) {
+        AW20216_write_register(DRIVER_1_CS, AW_PAGE_PWM, led.r, red);
+        AW20216_write_register(DRIVER_1_CS, AW_PAGE_PWM, led.g, green);
+        AW20216_write_register(DRIVER_1_CS, AW_PAGE_PWM, led.b, blue);
+    }
+#ifdef DRIVER_2_CS
+    else if (led.driver == 1) {
+        AW20216_write_register(DRIVER_2_CS, AW_PAGE_PWM, led.r, red);
+        AW20216_write_register(DRIVER_2_CS, AW_PAGE_PWM, led.g, green);
+        AW20216_write_register(DRIVER_2_CS, AW_PAGE_PWM, led.b, blue);
+    }
+#endif
+    return;
+}
+
+void AW20216_init(void) {
+    // All LEDs should start with all scaling and PWM registers as off
+    setPinOutput(DRIVER_1_EN);
+    writePinHigh(DRIVER_1_EN);
+    AW20216_write_register(DRIVER_1_CS, AW_PAGE_FUNCTION, AW_REG_GLOBALCURRENT, AW_GLOBAL_CURRENT_MAX);
+#ifdef DRIVER_2_EN
+    setPinOutput(DRIVER_2_EN);
+    writePinHigh(DRIVER_2_EN);
+    AW20216_write_register(DRIVER_2_CS, AW_PAGE_FUNCTION, AW_REG_GLOBALCURRENT, AW_GLOBAL_CURRENT_MAX);
+#endif
+    AW20216_init_scaling();
+    AW20216_soft_enable();
+    return;
+}
+
+void AW20216_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    g_pwm_buffer[index].r               = red;
+    g_pwm_buffer[index].g               = green;
+    g_pwm_buffer[index].b               = blue;
+    g_pwm_buffer_update_required[index] = true;
+    return;
+}
+void AW20216_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (uint8_t i = 0; i < DRIVER_LED_TOTAL; i++) {
+        AW20216_set_color(i, red, green, blue);
+    }
+    return;
+}
+void AW20216_update_pwm_buffers(void) {
+    for (uint8_t i = 0; i < DRIVER_LED_TOTAL; i++) {
+        if (g_pwm_buffer_update_required[i]) {
+            AW20216_update_pwm(i, g_pwm_buffer[i].r, g_pwm_buffer[i].g, g_pwm_buffer[i].b);
+            g_pwm_buffer_update_required[i] = false;
+        }
+    }
+    return;
+}