1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/led/issi/is31fl3218-mono.c b/drivers/led/issi/is31fl3218-mono.c
new file mode 100644
index 0000000000..0174da7ab3
--- /dev/null
+++ b/drivers/led/issi/is31fl3218-mono.c
@@ -0,0 +1,156 @@
+/* Copyright 2018 Jason Williams (Wilba)
+ *
+ * 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 "is31fl3218-mono.h"
+#include "i2c_master.h"
+#include "gpio.h"
+
+#define IS31FL3218_PWM_REGISTER_COUNT 18
+#define IS31FL3218_LED_CONTROL_REGISTER_COUNT 3
+
+#ifndef IS31FL3218_I2C_TIMEOUT
+#    define IS31FL3218_I2C_TIMEOUT 100
+#endif
+
+#ifndef IS31FL3218_I2C_PERSISTENCE
+#    define IS31FL3218_I2C_PERSISTENCE 0
+#endif
+
+typedef struct is31fl3218_driver_t {
+    uint8_t pwm_buffer[IS31FL3218_PWM_REGISTER_COUNT];
+    bool    pwm_buffer_dirty;
+    uint8_t led_control_buffer[IS31FL3218_LED_CONTROL_REGISTER_COUNT];
+    bool    led_control_buffer_dirty;
+} PACKED is31fl3218_driver_t;
+
+// IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining.
+is31fl3218_driver_t driver_buffers = {
+    .pwm_buffer               = {0},
+    .pwm_buffer_dirty         = false,
+    .led_control_buffer       = {0},
+    .led_control_buffer_dirty = false,
+};
+
+void is31fl3218_write_register(uint8_t reg, uint8_t data) {
+#if IS31FL3218_I2C_PERSISTENCE > 0
+    for (uint8_t i = 0; i < IS31FL3218_I2C_PERSISTENCE; i++) {
+        if (i2c_write_register(IS31FL3218_I2C_ADDRESS << 1, reg, &data, 1, IS31FL3218_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) break;
+    }
+#else
+    i2c_write_register(IS31FL3218_I2C_ADDRESS << 1, reg, &data, 1, IS31FL3218_I2C_TIMEOUT);
+#endif
+}
+
+void is31fl3218_write_pwm_buffer(void) {
+#if IS31FL3218_I2C_PERSISTENCE > 0
+    for (uint8_t i = 0; i < IS31FL3218_I2C_PERSISTENCE; i++) {
+        if (i2c_write_register(IS31FL3218_I2C_ADDRESS << 1, IS31FL3218_REG_PWM, driver_buffers.pwm_buffer, 18, IS31FL3218_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) break;
+    }
+#else
+    i2c_write_register(IS31FL3218_I2C_ADDRESS << 1, IS31FL3218_REG_PWM, driver_buffers.pwm_buffer, 18, IS31FL3218_I2C_TIMEOUT);
+#endif
+}
+
+void is31fl3218_init(void) {
+    i2c_init();
+
+#if defined(IS31FL3218_SDB_PIN)
+    gpio_set_pin_output(IS31FL3218_SDB_PIN);
+    gpio_write_pin_high(IS31FL3218_SDB_PIN);
+#endif
+
+    // In case we ever want to reinitialize (?)
+    is31fl3218_write_register(IS31FL3218_REG_RESET, 0x00);
+
+    // Turn off software shutdown
+    is31fl3218_write_register(IS31FL3218_REG_SHUTDOWN, 0x01);
+
+    // Set all PWM values to zero
+    for (uint8_t i = 0; i < IS31FL3218_PWM_REGISTER_COUNT; i++) {
+        is31fl3218_write_register(IS31FL3218_REG_PWM + i, 0x00);
+    }
+
+    // turn off all LEDs in the LED control register
+    for (uint8_t i = 0; i < IS31FL3218_LED_CONTROL_REGISTER_COUNT; i++) {
+        is31fl3218_write_register(IS31FL3218_REG_LED_CONTROL_1 + i, 0x00);
+    }
+
+    // Load PWM registers and LED Control register data
+    is31fl3218_write_register(IS31FL3218_REG_UPDATE, 0x01);
+
+    for (int i = 0; i < IS31FL3218_LED_COUNT; i++) {
+        is31fl3218_set_led_control_register(i, true);
+    }
+
+    is31fl3218_update_led_control_registers();
+}
+
+void is31fl3218_set_value(int index, uint8_t value) {
+    is31fl3218_led_t led;
+
+    if (index >= 0 && index < IS31FL3218_LED_COUNT) {
+        memcpy_P(&led, (&g_is31fl3218_leds[index]), sizeof(led));
+
+        if (driver_buffers.pwm_buffer[led.v] == value) {
+            return;
+        }
+
+        driver_buffers.pwm_buffer[led.v] = value;
+        driver_buffers.pwm_buffer_dirty  = true;
+    }
+}
+
+void is31fl3218_set_value_all(uint8_t value) {
+    for (int i = 0; i < IS31FL3218_LED_COUNT; i++) {
+        is31fl3218_set_value(i, value);
+    }
+}
+
+void is31fl3218_set_led_control_register(uint8_t index, bool value) {
+    is31fl3218_led_t led;
+    memcpy_P(&led, (&g_is31fl3218_leds[index]), sizeof(led));
+
+    uint8_t control_register = led.v / 6;
+    uint8_t bit_value        = led.v % 6;
+
+    if (value) {
+        driver_buffers.led_control_buffer[control_register] |= (1 << bit_value);
+    } else {
+        driver_buffers.led_control_buffer[control_register] &= ~(1 << bit_value);
+    }
+
+    driver_buffers.led_control_buffer_dirty = true;
+}
+
+void is31fl3218_update_pwm_buffers(void) {
+    if (driver_buffers.pwm_buffer_dirty) {
+        is31fl3218_write_pwm_buffer();
+        // Load PWM registers and LED Control register data
+        is31fl3218_write_register(IS31FL3218_REG_UPDATE, 0x01);
+
+        driver_buffers.pwm_buffer_dirty = false;
+    }
+}
+
+void is31fl3218_update_led_control_registers(void) {
+    if (driver_buffers.led_control_buffer_dirty) {
+        for (uint8_t i = 0; i < IS31FL3218_LED_CONTROL_REGISTER_COUNT; i++) {
+            is31fl3218_write_register(IS31FL3218_REG_LED_CONTROL_1 + i, driver_buffers.led_control_buffer[i]);
+        }
+
+        driver_buffers.led_control_buffer_dirty = false;
+    }
+}