static int
yas_init(void)
{
	uint8_t id = 0;

	if (module.initialized)
		return YAS_ERROR_INITIALIZE;
	module.cbk.usleep(YAS_POWERUP_TIME);
	if (module.cbk.device_open(YAS_TYPE_ACC) < 0)
		return YAS_ERROR_DEVICE_COMMUNICATION;
	if (yas_read_reg(YAS_WHO_AM_I, &id) < 0) {
		module.cbk.device_close(YAS_TYPE_ACC);
		return YAS_ERROR_DEVICE_COMMUNICATION;
	}
	printk("who_am_i_val:%02x\n", id);
	accel_product_id = id;
	
	if (id != YAS_WHO_AM_I_VAL) {
		module.cbk.device_close(YAS_TYPE_ACC);
		return YAS_ERROR_CHIP_ID;
	}
	module.enable = 0;
	module.delay = YAS_DEFAULT_SENSOR_DELAY;
	module.position = YAS_DEFAULT_POSITION;
	yas_set_odr(module.delay);
	yas_power_down();
	module.cbk.device_close(YAS_TYPE_ACC);
	module.initialized = 1;
	return YAS_NO_ERROR;
}
static int
yas_set_enable(int enable)
{
	int rt;

	if (!module.initialized)
		return YAS_ERROR_INITIALIZE;
	if (enable != 0)
		enable = 1;
	if (module.enable == enable)
		return YAS_NO_ERROR;
	if (enable) {
		module.cbk.usleep(YAS_POWERUP_TIME);
		if (module.cbk.device_open(YAS_TYPE_ACC))
			return YAS_ERROR_DEVICE_COMMUNICATION;
		rt = yas_power_up();
		if (rt < 0) {
			module.cbk.device_close(YAS_TYPE_ACC);
			return rt;
		}
	} else {
		yas_power_down();
		module.cbk.device_close(YAS_TYPE_ACC);
	}
	module.enable = enable;
	return YAS_NO_ERROR;
}
static int
yas_init(void)
{
    uint8_t id;

    if (module.initialized)
        return YAS_ERROR_INITIALIZE;
    module.cbk.usleep(YAS_STARTUP_TIME);
    if (module.cbk.device_open(YAS_TYPE_ACC) < 0)
        return YAS_ERROR_DEVICE_COMMUNICATION;
    if (yas_read_reg(YAS_BGW_CHIPID, &id) < 0) {
        module.cbk.device_close(YAS_TYPE_ACC);
        return YAS_ERROR_DEVICE_COMMUNICATION;
    }
    if (id != YAS_BGW_CHIPID_VAL) {
        module.cbk.device_close(YAS_TYPE_ACC);
        return YAS_ERROR_CHIP_ID;
    }
    module.enable = 0;
    module.delay = YAS_DEFAULT_SENSOR_DELAY;
    module.position = YAS_DEFAULT_POSITION;
    yas_set_sd(module.delay);
    yas_power_down();
    module.cbk.device_close(YAS_TYPE_ACC);
    module.initialized = 1;
    return YAS_NO_ERROR;
}