/* Bunch of i2c helper functions and defs mostly */

#ifndef I2C_H
#define I2C_H

#define I2C_DEVICE_ADDR 0x2b

#define I2C_REG_WHOAMI       0x00
#define I2C_REG_CURRENT_RPM  0x02
#define I2C_REG_TARGET_RPM   0x04
#define I2C_REG_CURRENT_DUTY 0x06
#define I2C_REG_MAX_DUTY     0x08
#define I2C_REG_STATE        0x0a
#define I2C_REG_MODE         0x0b

static void i2c_set_register_word(volatile uint8_t* reg, const uint8_t addr, const uint16_t value) {
    if (addr % 2) return;
    reg[addr] = value >> 8;
    reg[addr + 1] = value & 0xff;
}

static uint16_t i2c_get_register_word(volatile uint8_t* reg, const uint8_t addr) {
    if (addr % 2) return 0;
    return (reg[addr] << 8) + reg[addr + 1];
}

static void i2c_registers_reinit(volatile uint8_t* reg) {
    i2c_set_register_word(reg, I2C_REG_WHOAMI, 26923); // magic value ;)
    i2c_set_register_word(reg, I2C_REG_MAX_DUTY, fan_driver_pwm_get_max_duty());
}

static void i2c_registers_set_defaults(volatile uint8_t* reg) {
    i2c_set_register_word(reg, I2C_REG_TARGET_RPM, 750);
    reg[I2C_REG_MODE] = 0x01; // target rpm mode, power enabled
}

#endif //I2C_H