sm750_sw_i2c_write_reg
long sm750_sw_i2c_write_reg(unsigned char addr,
sm750_sw_i2c_write_reg(0xec, 0x1d, 0x16);
sm750_sw_i2c_write_reg(0xec, 0x21, 0x9);
sm750_sw_i2c_write_reg(0xec, 0x49, 0xC0);