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/* Copyright 2021 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "fpsensor_detect.h"
#include "gpio.h"
#include "timer.h"
enum fp_sensor_type get_fp_sensor_type(void)
{
enum fp_sensor_type ret;
gpio_set_level(GPIO_DIVIDER_HIGHSIDE, 1);
usleep(1);
switch (gpio_get_level(GPIO_FP_SENSOR_SEL)) {
case 0:
ret = FP_SENSOR_TYPE_ELAN;
break;
case 1:
ret = FP_SENSOR_TYPE_FPC;
break;
default:
ret = FP_SENSOR_TYPE_UNKNOWN;
break;
}
/* We leave GPIO_DIVIDER_HIGHSIDE enabled, since the dragonclaw
* development board use it to enable the AND gate (U10) to CS.
* Production boards could disable this to save power since it's
* only needed for initial detection on those boards.
*/
return ret;
}
enum fp_sensor_spi_select get_fp_sensor_spi_select(void)
{
return FP_SENSOR_SPI_SELECT_PRODUCTION;
}
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