text: /* Copyright 2016 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.
   */
  
  /* Reef board-specific configuration */
  
  #include "adc.h"
  #include "adc_chip.h"
  #include "als.h"
  #include "button.h"
  #include "charge_manager.h"
  #include "charge_ramp.h"
  #include "charge_state.h"
  #include "charger.h"
  #include "chipset.h"
  #include "console.h"
  #include "driver/als_opt3001.h"
  #include "driver/accel_kionix.h"
  #include "driver/accel_kx022.h"
  #include "driver/accelgyro_bmi_common.h"
  #include "driver/baro_bmp280.h"
  #include "driver/charger/bd9995x.h"
  #include "driver/tcpm/anx74xx.h"
  #include "driver/tcpm/ps8xxx.h"
  #include "driver/tcpm/tcpci.h"
  #include "driver/tcpm/tcpm.h"
  #include "extpower.h"
  #include "gpio.h"
  #include "hooks.h"
  #include "host_command.h"
  #include "i2c.h"
  #include "keyboard_scan.h"
  #include "lid_angle.h"
  #include "lid_switch.h"
  #include "math_util.h"
  #include "motion_sense.h"
  #include "motion_lid.h"
  #include "power.h"
  #include "power_button.h"
  #include "pwm.h"
  #include "pwm_chip.h"
  #include "lpc_chip.h"
  #include "spi.h"
  #include "spi_chip.h"
  #include "switch.h"
  #include "system.h"
  #include "tablet_mode.h"
  #include "task.h"
  #include "temp_sensor.h"
  #include "tfdp_chip.h"
  #include "thermistor.h"
  #include "timer.h"
  #include "uart.h"
  #include "usb_charge.h"
  #include "usb_mux.h"
  #include "usb_pd.h"
  #include "usb_pd_tcpm.h"
  #include "util.h"
  
  
  #define CPUTS(outstr) cputs(CC_USBCHARGE, outstr)
  #define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args)
  #define CPRINTF(format, args...) cprintf(CC_USBCHARGE, format, ## args)
  
  #define IN_ALL_SYS_PG	POWER_SIGNAL_MASK(X86_ALL_SYS_PG)
  #define IN_PGOOD_PP3300	POWER_SIGNAL_MASK(X86_PGOOD_PP3300)
  #define IN_PGOOD_PP5000	POWER_SIGNAL_MASK(X86_PGOOD_PP5000)
  
  #define USB_PD_PORT_ANX74XX	0
  #define USB_PD_PORT_PS8751	1
  
  #ifdef CONFIG_BOARD_PRE_INIT
  /*
   * reefmchp - requires changing
   * VTR1 pin domain = 3.3V
   * VTR2 pin domain = 1.8V
   * VTR3 pin domain = 3.3V
   */
  void board_config_pre_init(void)
  {
  	MCHP_EC_GPIO_BANK_PWR = MCHP_EC_GPIO_BANK_PWR_VTR2_18;
  
  #ifdef CONFIG_LOW_POWER_IDLE
  	/* DEBUG - GPIO_0060 becomes 48MHZ_OUT
  	 * MEC1701 interposer J47-7
  	 */
  	gpio_config_module(MODULE_CHIPSET, 1);
  #endif
  }
  #endif
  
  /*
   * NOTES: The PD GPIO's are armed for falling edge.
   * There is a potential race condition in this routine.
   * ISR calls this routine and it reads state of GPIO pin.
   * If GPIO is still asserted low, this routine will do nothing.
   * If this routine samples GPIO after it returns high then it
   * will wake the PDCMD task.
   */
  static void tcpc_alert_event(enum gpio_signal signal)
  {
  	int port = -1;
  
  	switch (signal) {
  	case GPIO_USB_C0_PD_INT_ODL:
  		port = 0;
  		break;
  	case GPIO_USB_C1_PD_INT_ODL:
  		port = 1;
  		break;
  	default:
  		return;
  	}
  
  	schedule_deferred_pd_interrupt(port);
  }
  
  #ifdef CONFIG_USB_PD_TCPC_LOW_POWER
  static void anx74xx_cable_det_handler(void)
  {
  	int cable_det = gpio_get_level(GPIO_USB_C0_CABLE_DET);
  	int reset_n = gpio_get_level(GPIO_USB_C0_PD_RST_L);
  
  	/*
  	 * A cable_det low->high transition was detected. If following the
  	 * debounce time, cable_det is high, and reset_n is low, then ANX3429 is
  	 * currently in standby mode and needs to be woken up. Set the
  	 * TCPC_RESET event which will bring the ANX3429 out of standby
  	 * mode. Setting this event is gated on reset_n being low because the
  	 * ANX3429 will always set cable_det when transitioning to normal mode
  	 * and if in normal mode, then there is no need to trigger a tcpc reset.
  	 */
  	if (cable_det && !reset_n)
  		task_set_event(TASK_ID_PD_C0, PD_EVENT_TCPC_RESET, 0);
  }
  DECLARE_DEFERRED(anx74xx_cable_det_handler);
  /* from firmware-reef-9042.B */
  DECLARE_HOOK(HOOK_CHIPSET_RESUME, anx74xx_cable_det_handler, HOOK_PRIO_LAST);
  
  void anx74xx_cable_det_interrupt(enum gpio_signal signal)
  {
  	/* debounce for 2 msec */
  	hook_call_deferred(&anx74xx_cable_det_handler_data, (2 * MSEC));
  }
  #endif
  
  /*
   * enable_input_devices() is called by the tablet_mode ISR, but changes the
   * state of GPIOs, so its definition must reside after including gpio_list.
   * Use DECLARE_DEFERRED to generate enable_input_devices_data.
   */
  static void enable_input_devices(void);
  DECLARE_DEFERRED(enable_input_devices);
  
  #define LID_DEBOUNCE_US    (30 * MSEC)  /* Debounce time for lid switch */
  void tablet_mode_interrupt(enum gpio_signal signal)
  {
  	hook_call_deferred(&enable_input_devices_data, LID_DEBOUNCE_US);
  }
  
  #include "gpio_list.h"
  
  /* SPI devices */
  const struct spi_device_t spi_devices[] = {
  	{ QMSPI0_PORT, 4, GPIO_QMSPI_CS0},
  #if defined(CONFIG_SPI_ACCEL_PORT)
  	{ GPSPI0_PORT, 2, GPIO_SPI0_CS0 },
  #endif
  };
  const unsigned int spi_devices_used = ARRAY_SIZE(spi_devices);
  
  /* ADC channels */
  /* chip/mchp defined adc_t
   * name, factor_mul, factor_div, shift, channel
   * Signals routed through interposer to MEC17xx ADC channels.
   */
  const struct adc_t adc_channels[] = {
  	/* Vref = 3.000V, 10-bit unsigned reading */
  	[ADC_TEMP_SENSOR_CHARGER] = {
  		"CHARGER", 3000, 1024, 0, 0
  	},
  	[ADC_TEMP_SENSOR_AMB] = {
  		"AMBIENT", 3000, 1024, 0, 1
  	},
  	[ADC_BOARD_ID] = {
  		"BRD_ID", 3000, 1024, 0, 2
  	},
  };
  BUILD_ASSERT(ARRAY_SIZE(adc_channels) == ADC_CH_COUNT);
  
  /* PWM channels. Must be in the exactly same order as in enum pwm_channel. */
  #ifdef CONFIG_PWM
  const struct pwm_t pwm_channels[] = {
  	/* channel, flags */
  	[PWM_CH_LED_GREEN] = { 4, PWM_CONFIG_DSLEEP },
  	[PWM_CH_LED_RED] =   { 5, PWM_CONFIG_DSLEEP },
  };
  BUILD_ASSERT(ARRAY_SIZE(pwm_channels) == PWM_CH_COUNT);
  #endif /* #ifdef CONFIG_PWM */
  
  /*
   * Using Ports 3, 6, 7 from board.h
   * Using Ports 0, 2 from board.c
   * Due to added RC of interposer board temporarily reduce
   * 400 to 100 kHz.
   */
  const struct i2c_port_t i2c_ports[]  = {
  	{"tcpc0",     MCHP_I2C_PORT0, 400,
  		GPIO_EC_I2C_USB_C0_PD_SCL, GPIO_EC_I2C_USB_C0_PD_SDA},
  	{"tcpc1",     MCHP_I2C_PORT2, 400,
  		GPIO_EC_I2C_USB_C1_PD_SCL, GPIO_EC_I2C_USB_C1_PD_SDA},
  	{"accelgyro", I2C_PORT_GYRO, 400,
  		GPIO_EC_I2C_GYRO_SCL,      GPIO_EC_I2C_GYRO_SDA},
  	{"sensors",   MCHP_I2C_PORT7, 400,
  		GPIO_EC_I2C_SENSOR_SCL,    GPIO_EC_I2C_SENSOR_SDA},
  	{"batt",      MCHP_I2C_PORT3, 100,
  		GPIO_EC_I2C_POWER_SCL,     GPIO_EC_I2C_POWER_SDA},
  };
  const unsigned int i2c_ports_used = ARRAY_SIZE(i2c_ports);
  
  /*
   * Map ports to controller.
   * Ports may map to the same controller.
   * Both USB PD ports are mapped to CTRL0.
   */
  const uint16_t i2c_port_to_ctrl[I2C_PORT_COUNT] = {
  	(MCHP_I2C_CTRL0 << 8) + MCHP_I2C_PORT0,
  	(MCHP_I2C_CTRL0 << 8) + MCHP_I2C_PORT2,
  	(MCHP_I2C_CTRL1 << 8) + I2C_PORT_GYRO,
  	(MCHP_I2C_CTRL2 << 8) + MCHP_I2C_PORT3,
  	(MCHP_I2C_CTRL3 << 8) + MCHP_I2C_PORT7,
  };
  
  /*
   * Used by chip level I2C controller initialization.
   * Board level can specify two unused I2C addresses
   * for each controller. Current chip level disables
   * controller response to address 0(general call).
   */
  const uint32_t i2c_ctrl_slave_addrs[I2C_CONTROLLER_COUNT] = {
  	0, 0, 0, 0,
  };
  
  const struct charger_config_t chg_chips[] = {
  	{
  		.i2c_port = I2C_PORT_CHARGER,
  		.i2c_addr_flags = BD9995X_ADDR_FLAGS,
  		.drv = &bd9995x_drv,
  	},
  };
  const unsigned int chg_cnt = ARRAY_SIZE(chg_chips);
  
  /* Return the two slave addresses the specified
   * controller will respond to when controller
   * is acting as a slave.
   * b[6:0]  = b[7:1] of I2C address 1
   * b[14:8] = b[7:1] of I2C address 2
   * When not using I2C controllers as slaves we can use
   * the same value for all controllers. The address should
   * not be 0x00 as this is the general call address.
   */
  uint16_t board_i2c_slave_addrs(int controller)
  {
  	int i;
  
  	for (i = 0; i < I2C_CONTROLLER_COUNT; i++)
  		if ((i2c_ctrl_slave_addrs[i] & 0xffff) == controller)
  			return (i2c_ctrl_slave_addrs[i] >> 16);
  
  	return 0; /* general call address */
  }
  
  /*
   * default to I2C0 because callers may not check
   * return value if we returned an error code.
   */
  int board_i2c_p2c(int port)
  {
  	int i;
  
  	for (i = 0; i < I2C_PORT_COUNT; i++)
  		if ((i2c_port_to_ctrl[i] & 0xFF) == port)
  			return (int)(i2c_port_to_ctrl[i] >> 8);
  
  	return -1;
  }
  
  #ifdef CONFIG_CMD_I2C_STRESS_TEST
  struct i2c_stress_test i2c_stress_tests[] = {
  
  #ifdef CONFIG_CMD_I2C_STRESS_TEST_TCPC
  	{
  		.port = MCHP_I2C_PORT0,
  		.addr_flags = 0x28,
  		.i2c_test = &anx74xx_i2c_stress_test_dev,
  	},
  #endif
  
  #ifdef CONFIG_CMD_I2C_STRESS_TEST_TCPC
  	{
  		.port = MCHP_I2C_PORT2,
  		.addr_flags = 0x0B,
  		.i2c_test = &ps8xxx_i2c_stress_test_dev,
  	},
  #endif
  #ifdef CONFIG_CMD_I2C_STRESS_TEST_ACCEL
  	{
  		.port = I2C_PORT_GYRO,
  		.addr_flags = BMI160_ADDR0_FLAGS,
  		.i2c_test = &bmi160_i2c_stress_test_dev,
  	},
  #endif
  #ifdef CONFIG_CMD_I2C_STRESS_TEST_ACCEL
  	{
  		.port = I2C_PORT_BARO,
  		.addr_flags = BMP280_I2C_ADDRESS1_FLAGS,
  		.i2c_test = &bmp280_i2c_stress_test_dev,
  	},
  	{
  		.port = I2C_PORT_LID_ACCEL,
  		.addr_flags = KX022_ADDR1_FLAGS,
  		.i2c_test = &kionix_i2c_stress_test_dev,
  	},
  #endif
  #ifdef CONFIG_CMD_I2C_STRESS_TEST_ALS
  	{
  		.port = I2C_PORT_ALS,
  		.addr_flags = OPT3001_I2C_ADDR1_FLAGS,
  		.i2c_test = &opt3001_i2c_stress_test_dev,
  	},
  #endif
  /* MCHP_I2C_PORT3 */
  #ifdef CONFIG_CMD_I2C_STRESS_TEST_BATTERY
  	{
  		.i2c_test = &battery_i2c_stress_test_dev,
  	},
  #endif
  /* MCHP_I2C_PORT3 */
  #ifdef CONFIG_CMD_I2C_STRESS_TEST_CHARGER
  	{
  		.i2c_test = &bd9995x_i2c_stress_test_dev,
  	},
  #endif
  };
  const int i2c_test_dev_used = ARRAY_SIZE(i2c_stress_tests);
  #endif /* CONFIG_CMD_I2C_STRESS_TEST */
  
  const struct tcpc_config_t tcpc_config[CONFIG_USB_PD_PORT_MAX_COUNT] = {
  	[USB_PD_PORT_ANX74XX] = {
  		.bus_type = EC_BUS_TYPE_I2C,
  		.i2c_info = {
  			.port = MCHP_I2C_PORT0,
  			.addr_flags = 0x28,
  		},
  		.drv = &anx74xx_tcpm_drv,
  	},
  	[USB_PD_PORT_PS8751] = {
  		.bus_type = EC_BUS_TYPE_I2C,
  		.i2c_info = {
  			.port = MCHP_I2C_PORT2,
  			.addr_flags = 0x0B,
  		},
  		.drv = &ps8xxx_tcpm_drv,
  	},
  };
  
  uint16_t tcpc_get_alert_status(void)
  {
  	uint16_t status = 0;
  
  	if (!gpio_get_level(GPIO_USB_C0_PD_INT_ODL)) {
  		if (gpio_get_level(GPIO_USB_C0_PD_RST_L))
  			status |= PD_STATUS_TCPC_ALERT_0;
  	}
  
  	if (!gpio_get_level(GPIO_USB_C1_PD_INT_ODL)) {
  		if (gpio_get_level(GPIO_USB_C1_PD_RST_ODL))
  			status |= PD_STATUS_TCPC_ALERT_1;
  	}
  
  	return status;
  }
  
  const enum gpio_signal hibernate_wake_pins[] = {
  	GPIO_AC_PRESENT,
  	GPIO_LID_OPEN,
  	GPIO_POWER_BUTTON_L,
  };
  
  const int hibernate_wake_pins_used = ARRAY_SIZE(hibernate_wake_pins);
  
  /*
   * PS8751 TCPM DRP low power idle behavour is causing I2C errors.
   * Upon receiving DRP low power idle command, PS8751 holds SCL and
   * SDA low for ~480us. It simultaneously releases both pins which is
   * defined as a bus error condition by I2C spec. No ACK received.
   * TCPCI spec. states waking any TCPM requires sending any dummy
   * I2C command which the TCPM will NACK. The I2C master MUST wait
   * a minimum of 5 ms after the NACK before sending another I2C
   * command. We observe the PD task and TCPCI state machines do not
   * follow the TCPCI spec. Sometimes this routine is called to wake
   * the PS8751 after it has been put into low power idle and sometimes
   * the PD/TCPCI state machine doesn't call this routine and tries
   * communicating with PS8751. This results in lots of I2C retries and
   * results taking up to 10ms before I2C communication with PS8751
   * is stable. Don't know how to fix this.
   */
  static int ps8751_tune_mux(const struct usb_mux *me)
  {
  	int rv;
  
  	/* 0x98 sets lower EQ of DP port (4.5db) */
  	rv = mux_write(me, PS8XXX_REG_MUX_DP_EQ_CONFIGURATION, 0x98);
  
  	/* TCPCI spec. delay msleep(6); */
  
  	return rv;
  }
  
  /*
   * USB_PD_PORT_ANX74XX and USB_PD_PORT_PS8751 are zero based indices into
   * tcpc_config array. The tcpc_config array contains the actual EC I2C
   * port, device slave address, and a function pointer into the driver code.
   */
  const struct usb_mux usb_muxes[CONFIG_USB_PD_PORT_MAX_COUNT] = {
  	[USB_PD_PORT_ANX74XX] = {
  		.usb_port = USB_PD_PORT_ANX74XX,
  		.driver = &anx74xx_tcpm_usb_mux_driver,
  		.hpd_update = &anx74xx_tcpc_update_hpd_status,
  	},
  	[USB_PD_PORT_PS8751] = {
  		.usb_port = USB_PD_PORT_PS8751,
  		.driver = &tcpci_tcpm_usb_mux_driver,
  		.hpd_update = &ps8xxx_tcpc_update_hpd_status,
  		.board_init = &ps8751_tune_mux,
  	}
  };
  
  /* MCHP
   * New, not in firmware-reef-9042.B
   */
  const int usb_port_enable[CONFIG_USB_PORT_POWER_SMART_PORT_COUNT] = {
  	GPIO_USB1_ENABLE,
  };
  
  /**
   * Power on (or off) a single TCPC.
   * minimum on/off delays are included.
   *
   * @param port	Port number of TCPC.
   * @param mode	0: power off, 1: power on.
   */
  void board_set_tcpc_power_mode(int port, int mode)
  {
  	if (port != USB_PD_PORT_ANX74XX)
  		return;
  
  	switch (mode) {
  	case ANX74XX_NORMAL_MODE:
  		gpio_set_level(GPIO_EN_USB_TCPC_PWR, 1);
  		msleep(ANX74XX_PWR_H_RST_H_DELAY_MS);
  		gpio_set_level(GPIO_USB_C0_PD_RST_L, 1);
  		break;
  	case ANX74XX_STANDBY_MODE:
  		gpio_set_level(GPIO_USB_C0_PD_RST_L, 0);
  		msleep(ANX74XX_RST_L_PWR_L_DELAY_MS);
  		gpio_set_level(GPIO_EN_USB_TCPC_PWR, 0);
  		msleep(ANX74XX_PWR_L_PWR_H_DELAY_MS);
  		break;
  	default:
  		break;
  	}
  }
  
  /**
   * Reset all system PD/TCPC MCUs -- currently only called from
   * handle_pending_reboot() in common/power.c just before hard
   * resetting the system. This logic is likely not needed as the
   * PP3300_A rail should be dropped on EC reset.
   */
  void board_reset_pd_mcu(void)
  {
  	/* Assert reset to TCPC1 */
  	gpio_set_level(GPIO_USB_C1_PD_RST_ODL, 0);
  
  	/* Assert reset to TCPC0 (anx3429) */
  	gpio_set_level(GPIO_USB_C0_PD_RST_L, 0);
  	/* TCPC1 (ps8751) requires 1ms reset down assertion */
  	msleep(MAX(1, ANX74XX_RST_L_PWR_L_DELAY_MS));
  
  	/* Deassert reset to TCPC1 */
  	gpio_set_level(GPIO_USB_C1_PD_RST_ODL, 1);
  	/* Disable TCPC0 power */
  	gpio_set_level(GPIO_EN_USB_TCPC_PWR, 0);
  
  	/*
  	 * anx3429 requires 10ms reset/power down assertion
  	 */
  	msleep(ANX74XX_PWR_L_PWR_H_DELAY_MS);
  	board_set_tcpc_power_mode(USB_PD_PORT_ANX74XX, 1);
  }
  
  void board_tcpc_init(void)
  {
  	int reg;
  
  	/* Only reset TCPC if not sysjump */
  	if (!system_jumped_to_this_image())
  		board_reset_pd_mcu();
  
  	/*
  	 * TODO: Remove when Reef is updated with PS8751 A3.
  	 *
  	 * Force PS8751 A2 to wake from low power mode.
  	 * If PS8751 remains in low power mode after sysjump,
  	 * TCPM_INIT will fail due to not able to access PS8751.
  	 *
  	 * NOTE: PS8751 A3 will wake on any I2C access.
  	 */
  	reg = 0;
  	/* TODO MCHP:
  	 * PS8751 is at I2C address 0x16. Original reef using
  	 * address 0x10. Is this another attempt at waking PS8751
  	 * from DRP low power idle mode?
  	 */
  	i2c_read8(MCHP_I2C_PORT2, 0x08, 0xA0, &reg);
  
  	/* Enable TCPC0 interrupt */
  	gpio_enable_interrupt(GPIO_USB_C0_PD_INT_ODL);
  
  	/* Enable TCPC1 interrupt */
  	gpio_enable_interrupt(GPIO_USB_C1_PD_INT_ODL);
  
  #ifdef CONFIG_USB_PD_TCPC_LOW_POWER
  	/* Enable CABLE_DET interrupt for ANX3429 wake from standby */
  	gpio_enable_interrupt(GPIO_USB_C0_CABLE_DET);
  #endif
  	/*
  	 * Initialize HPD to low; after sysjump SOC needs to see
  	 * HPD pulse to enable video path
  	 */
  	for (int port = 0; port < CONFIG_USB_PD_PORT_MAX_COUNT; ++port)
  		usb_mux_hpd_update(port, 0, 0);
  }
  DECLARE_HOOK(HOOK_INIT, board_tcpc_init, HOOK_PRIO_INIT_I2C+1);
  
  /*
   * Data derived from Seinhart-Hart equation in a resistor divider circuit with
   * Vdd=3300mV, R = 13.7Kohm, and Murata NCP15WB-series thermistor (B = 4050,
   * T0 = 298.15, nominal resistance (R0) = 47Kohm).
   */
  #define CHARGER_THERMISTOR_SCALING_FACTOR 13
  static const struct thermistor_data_pair charger_thermistor_data[] = {
  	{ 3044 / CHARGER_THERMISTOR_SCALING_FACTOR, 0 },
  	{ 2890 / CHARGER_THERMISTOR_SCALING_FACTOR, 10 },
  	{ 2680 / CHARGER_THERMISTOR_SCALING_FACTOR, 20 },
  	{ 2418 / CHARGER_THERMISTOR_SCALING_FACTOR, 30 },
  	{ 2117 / CHARGER_THERMISTOR_SCALING_FACTOR, 40 },
  	{ 1800 / CHARGER_THERMISTOR_SCALING_FACTOR, 50 },
  	{ 1490 / CHARGER_THERMISTOR_SCALING_FACTOR, 60 },
  	{ 1208 / CHARGER_THERMISTOR_SCALING_FACTOR, 70 },
  	{ 966 / CHARGER_THERMISTOR_SCALING_FACTOR, 80 },
  	{ 860 / CHARGER_THERMISTOR_SCALING_FACTOR, 85 },
  	{ 766 / CHARGER_THERMISTOR_SCALING_FACTOR, 90 },
  	{ 679 / CHARGER_THERMISTOR_SCALING_FACTOR, 95 },
  	{ 603 / CHARGER_THERMISTOR_SCALING_FACTOR, 100 },
  };
  
  static const struct thermistor_info charger_thermistor_info = {
  	.scaling_factor = CHARGER_THERMISTOR_SCALING_FACTOR,
  	.num_pairs = ARRAY_SIZE(charger_thermistor_data),
  	.data = charger_thermistor_data,
  };
  
  int board_get_charger_temp(int idx, int *temp_ptr)
  {
  	int mv = adc_read_channel(MCHP_ADC_CH(0));
  
  	if (mv < 0)
  		return -1;
  
  	*temp_ptr = thermistor_linear_interpolate(mv,
  		&charger_thermistor_info);
  	*temp_ptr = C_TO_K(*temp_ptr);
  	return 0;
  }
  
  /*
   * Data derived from Seinhart-Hart equation in a resistor divider circuit with
   * Vdd=3300mV, R = 51.1Kohm, and Murata NCP15WB-series thermistor (B = 4050,
   * T0 = 298.15, nominal resistance (R0) = 47Kohm).
   */
  #define AMB_THERMISTOR_SCALING_FACTOR 11
  static const struct thermistor_data_pair amb_thermistor_data[] = {
  	{ 2512 / AMB_THERMISTOR_SCALING_FACTOR, 0 },
  	{ 2158 / AMB_THERMISTOR_SCALING_FACTOR, 10 },
  	{ 1772 / AMB_THERMISTOR_SCALING_FACTOR, 20 },
  	{ 1398 / AMB_THERMISTOR_SCALING_FACTOR, 30 },
  	{ 1070 / AMB_THERMISTOR_SCALING_FACTOR, 40 },
  	{ 803 / AMB_THERMISTOR_SCALING_FACTOR, 50 },
  	{ 597 / AMB_THERMISTOR_SCALING_FACTOR, 60 },
  	{ 443 / AMB_THERMISTOR_SCALING_FACTOR, 70 },
  	{ 329 / AMB_THERMISTOR_SCALING_FACTOR, 80 },
  	{ 285 / AMB_THERMISTOR_SCALING_FACTOR, 85 },
  	{ 247 / AMB_THERMISTOR_SCALING_FACTOR, 90 },
  	{ 214 / AMB_THERMISTOR_SCALING_FACTOR, 95 },
  	{ 187 / AMB_THERMISTOR_SCALING_FACTOR, 100 },
  };
  
  static const struct thermistor_info amb_thermistor_info = {
  	.scaling_factor = AMB_THERMISTOR_SCALING_FACTOR,
  	.num_pairs = ARRAY_SIZE(amb_thermistor_data),
  	.data = amb_thermistor_data,
  };
  
  int board_get_ambient_temp(int idx, int *temp_ptr)
  {
  	int mv = adc_read_channel(MCHP_ADC_CH(1));
  
  	if (mv < 0)
  		return -1;
  
  	*temp_ptr = thermistor_linear_interpolate(mv,
  		&amb_thermistor_info);
  	*temp_ptr = C_TO_K(*temp_ptr);
  	return 0;
  }
  
  /*
   * name, sensor type, read function,
   * index of sensor passed to read function,
   * delay from read to taking action
   */
  const struct temp_sensor_t temp_sensors[] = {
  	{"Battery", TEMP_SENSOR_TYPE_BATTERY, charge_get_battery_temp, 0},
  	{"Ambient", TEMP_SENSOR_TYPE_BOARD, board_get_ambient_temp, 0},
  	{"Charger", TEMP_SENSOR_TYPE_BOARD, board_get_charger_temp, 1},
  };
  BUILD_ASSERT(ARRAY_SIZE(temp_sensors) == TEMP_SENSOR_COUNT);
  
  /* Called by APL power state machine when transitioning from G3 to S5 */
  void chipset_pre_init_callback(void)
  {
  	/*
  	 * No need to re-init PMIC since settings are sticky across sysjump.
  	 * However, be sure to check that PMIC is already enabled. If it is
  	 * then there's no need to re-sequence the PMIC.
  	 */
  	if (system_jumped_to_this_image() && gpio_get_level(GPIO_PMIC_EN))
  		return;
  
  	/* Enable PP5000 before PP3300 due to NFC: chrome-os-partner:50807 */
  	gpio_set_level(GPIO_EN_PP5000, 1);
  	while (!gpio_get_level(GPIO_PP5000_PG))
  		;
  
  	/*
  	 * To prevent SLP glitches, PMIC_EN (V5A_EN) should be enabled
  	 * at the same time as PP3300 (chrome-os-partner:51323).
  	 */
  	/* Enable 3.3V rail */
  	gpio_set_level(GPIO_EN_PP3300, 1);
  	while (!gpio_get_level(GPIO_PP3300_PG))
  		;
  
  	/* Enable PMIC */
  	gpio_set_level(GPIO_PMIC_EN, 1);
  }
  
  static void board_set_tablet_mode(void)
  {
  	tablet_set_mode(!gpio_get_level(GPIO_TABLET_MODE_L));
  }
  
  /* Initialize board. */
  static void board_init(void)
  {
  	/* Ensure tablet mode is initialized according to the hardware state
  	 * so that the cached state reflects reality.
  	 */
  	board_set_tablet_mode();
  
  	gpio_enable_interrupt(GPIO_TABLET_MODE_L);
  
  	/* Enable charger interrupts */
  	gpio_enable_interrupt(GPIO_CHARGER_INT_L);
  
  	/* Enable Gyro interrupts */
  	gpio_enable_interrupt(GPIO_BASE_SIXAXIS_INT_L);
  }
  /* PP3300 needs to be enabled before TCPC init hooks */
  DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_FIRST);
  
  /*
   * MCHP - new version of this routine.
   * firmware-reef-9042.B must do port lookup here
   * before calling bd9995x_is_vbus_provided
   */
  int pd_snk_is_vbus_provided(int port)
  {
  	if (port != 0 && port != 1)
  		panic("Invalid charge port\n");
  
  	return bd9995x_is_vbus_provided(port);
  }
  
  /**
   * Set active charge port -- only one port can be active at a time.
   *
   * @param charge_port   Charge port to enable.
   *
   * Returns EC_SUCCESS if charge port is accepted and made active,
   * EC_ERROR_* otherwise.
   */
  int board_set_active_charge_port(int charge_port)
  {
  	enum bd9995x_charge_port bd9995x_port;
  	int bd9995x_port_select = 1;
  
  	switch (charge_port) {
  	case USB_PD_PORT_ANX74XX:
  	case USB_PD_PORT_PS8751:
  		/* Don't charge from a source port */
  		if (board_vbus_source_enabled(charge_port))
  			return -1;
  
  		bd9995x_port = charge_port;
  		break;
  	case CHARGE_PORT_NONE:
  		bd9995x_port_select = 0;
  		bd9995x_port = BD9995X_CHARGE_PORT_BOTH;
  
  		/*
  		 * To avoid inrush current from the external charger, enable
  		 * discharge on AC till the new charger is detected and
  		 * charge detect delay has passed.
  		 */
  		if (charge_get_percent() > 2)
  			charger_discharge_on_ac(1);
  		break;
  	default:
  		panic("Invalid charge port\n");
  		break;
  	}
  
  	CPRINTS("New chg p%d", charge_port);
  	return bd9995x_select_input_port(bd9995x_port, bd9995x_port_select);
  }
  
  /**
   * Set the charge limit based upon desired maximum.
   *
   * @param port          Port number.
   * @param supplier      Charge supplier type.
   * @param charge_ma     Desired charge limit (mA).
   * @param charge_mv     Negotiated charge voltage (mV).
   */
  void board_set_charge_limit(int port, int supplier, int charge_ma,
  			    int max_ma, int charge_mv)
  {
  	/* Enable charging trigger by BC1.2 detection */
  	int bc12_enable = (supplier == CHARGE_SUPPLIER_BC12_CDP ||
  			   supplier == CHARGE_SUPPLIER_BC12_DCP ||
  			   supplier == CHARGE_SUPPLIER_BC12_SDP ||
  			   supplier == CHARGE_SUPPLIER_OTHER);
  
  	if (bd9995x_bc12_enable_charging(port, bc12_enable))
  		return;
  
  	charge_ma = (charge_ma * 95) / 100;
  	charge_set_input_current_limit(MAX(charge_ma,
  			CONFIG_CHARGER_INPUT_CURRENT), charge_mv);
  }
  
  /**
   * Return if board is consuming full amount of input current
   */
  int board_is_consuming_full_charge(void)
  {
  	int chg_perc = charge_get_percent();
  
  	return chg_perc > 2 && chg_perc < 95;
  }
  
  /**
   * Return if VBUS is sagging too low
   */
  int board_is_vbus_too_low(int port, enum chg_ramp_vbus_state ramp_state)
  {
  	int voltage;
  
  	if (charger_get_vbus_voltage(port, &voltage))
  		voltage = 0;
  
  	return voltage < BD9995X_BC12_MIN_VOLTAGE;
  }
  
  static void enable_input_devices(void)
  {
  	/* We need to turn on tablet mode for motion sense */
  	board_set_tablet_mode();
  
  	/* Then, we disable peripherals only when the lid reaches 360 position.
  	 * (It's probably already disabled by motion_sense_task.)
  	 * We deliberately do not enable peripherals when the lid is leaving
  	 * 360 position. Instead, we let motion_sense_task enable it once it
  	 * reaches laptop zone (180 or less).
  	 */
  	if (tablet_get_mode())
  		lid_angle_peripheral_enable(0);
  }
  
  /* Enable or disable input devices, based on chipset state and tablet mode */
  #ifndef TEST_BUILD
  void lid_angle_peripheral_enable(int enable)
  {
  	/* If the lid is in 360 position, ignore the lid angle,
  	 * which might be faulty. Disable keyboard.
  	 */
  	if (tablet_get_mode() || chipset_in_state(CHIPSET_STATE_ANY_OFF))
  		enable = 0;
  	keyboard_scan_enable(enable, KB_SCAN_DISABLE_LID_ANGLE);
  }
  #endif
  
  /* Called on AP S5 -> S3 transition */
  static void board_chipset_startup(void)
  {
  	/* Enable USB-A port. */
  	gpio_set_level(GPIO_USB1_ENABLE, 1);
  
  	/* Enable Trackpad */
  	gpio_set_level(GPIO_EN_P3300_TRACKPAD_ODL, 0);
  
  	hook_call_deferred(&enable_input_devices_data, 0);
  }
  DECLARE_HOOK(HOOK_CHIPSET_STARTUP, board_chipset_startup, HOOK_PRIO_DEFAULT);
  
  /* Called on AP S3 -> S5 transition */
  static void board_chipset_shutdown(void)
  {
  	/* Disable USB-A port. */
  	gpio_set_level(GPIO_USB1_ENABLE, 0);
  
  	/* Disable Trackpad */
  	gpio_set_level(GPIO_EN_P3300_TRACKPAD_ODL, 1);
  
  	hook_call_deferred(&enable_input_devices_data, 0);
  	/* FIXME(dhendrix): Drive USB_PD_RST_ODL low to prevent
  	 * leakage? (see comment in schematic)
  	 */
  }
  DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, board_chipset_shutdown, HOOK_PRIO_DEFAULT);
  
  /* FIXME(dhendrix): Add CHIPSET_RESUME and CHIPSET_SUSPEND
   * hooks to enable/disable sensors?
   */
  /*
   * MCHP: Next two routines not present in firmware-reef-9042.B
   */
  /* Called on AP S3 -> S0 transition */
  static void board_chipset_resume(void)
  {
  	gpio_set_level(GPIO_ENABLE_BACKLIGHT, 1);
  }
  DECLARE_HOOK(HOOK_CHIPSET_RESUME, board_chipset_resume, HOOK_PRIO_DEFAULT);
  
  /* Called on AP S0 -> S3 transition */
  static void board_chipset_suspend(void)
  {
  	gpio_set_level(GPIO_ENABLE_BACKLIGHT, 0);
  }
  DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, board_chipset_suspend, HOOK_PRIO_DEFAULT);
  
  /*
   * FIXME(dhendrix): Weak symbol hack until we can get a better solution for
   * both Amenia and Reef.
   */
  void chipset_do_shutdown(void)
  {
  	/* Disable PMIC */
  	gpio_set_level(GPIO_PMIC_EN, 0);
  
  	/*Disable 3.3V rail */
  	gpio_set_level(GPIO_EN_PP3300, 0);
  	while (gpio_get_level(GPIO_PP3300_PG))
  		;
  
  	/*Disable 5V rail */
  	gpio_set_level(GPIO_EN_PP5000, 0);
  	while (gpio_get_level(GPIO_PP5000_PG))
  		;
  }
  
  void board_hibernate_late(void)
  {
  	int i;
  	const uint32_t hibernate_pins[][2] = {
  		/* Turn off LEDs in hibernate */
  		{GPIO_BAT_LED_BLUE, GPIO_INPUT | GPIO_PULL_UP},
  		{GPIO_BAT_LED_AMBER, GPIO_INPUT | GPIO_PULL_UP},
  		{GPIO_LID_OPEN, GPIO_INT_RISING | GPIO_PULL_DOWN},
  
  		/*
  		 * BD99956 handles charge input automatically. We'll disable
  		 * charge output in hibernate. Charger will assert ACOK_OD
  		 * when VBUS or VCC are plugged in.
  		 */
  		{GPIO_USB_C0_5V_EN,       GPIO_INPUT  | GPIO_PULL_DOWN},
  		{GPIO_USB_C1_5V_EN,       GPIO_INPUT  | GPIO_PULL_DOWN},
  	};
  
  	/* Change GPIOs' state in hibernate for better power consumption */
  	for (i = 0; i < ARRAY_SIZE(hibernate_pins); ++i)
  		gpio_set_flags(hibernate_pins[i][0], hibernate_pins[i][1]);
  
  	gpio_config_module(MODULE_KEYBOARD_SCAN, 0);
  
  	/*
  	 * Calling gpio_config_module sets disabled alternate function pins to
  	 * GPIO_INPUT.  But to prevent keypresses causing leakage currents
  	 * while hibernating we want to enable GPIO_PULL_UP as well.
  	 */
  	gpio_set_flags_by_mask(0x2, 0x03, GPIO_INPUT | GPIO_PULL_UP);
  	gpio_set_flags_by_mask(0x1, 0x7F, GPIO_INPUT | GPIO_PULL_UP);
  	gpio_set_flags_by_mask(0x0, 0xE0, GPIO_INPUT | GPIO_PULL_UP);
  	/* KBD_KSO2 needs to have a pull-down enabled instead of pull-up */
  	gpio_set_flags_by_mask(0x1, 0x80, GPIO_INPUT | GPIO_PULL_DOWN);
  }
  
  /* Motion sensors */
  /* Mutexes */
  static struct mutex g_lid_mutex;
  static struct mutex g_base_mutex;
  
  /* Matrix to rotate accelrator into standard reference frame */
  const mat33_fp_t base_standard_ref = {
  	{ 0, FLOAT_TO_FP(-1), 0},
  	{ FLOAT_TO_FP(1), 0,  0},
  	{ 0, 0,  FLOAT_TO_FP(1)}
  };
  
  const mat33_fp_t mag_standard_ref = {
  	{ FLOAT_TO_FP(-1), 0, 0},
  	{ 0,  FLOAT_TO_FP(1), 0},
  	{ 0, 0, FLOAT_TO_FP(-1)}
  };
  
  /* sensor private data */
  static struct kionix_accel_data g_kx022_data;
  static struct bmi_drv_data_t g_bmi160_data;
  static struct bmp280_drv_data_t bmp280_drv_data;
  /* MCHP: struct not present in firmware-reef-9042.B */
  static struct opt3001_drv_data_t g_opt3001_data = {
  	.scale = 1,
  	.uscale = 0,
  	.offset = 0,
  };
  
  /* MCHP: differences in structure initializatio from
   * firmware-reef-9042.B
   */
  /* FIXME(dhendrix): Copied from Amenia, probably need to tweak for Reef */
  struct motion_sensor_t motion_sensors[] = {
  	[LID_ACCEL] = {
  	 .name = "Lid Accel",
  	 .active_mask = SENSOR_ACTIVE_S0_S3,
  	 .chip = MOTIONSENSE_CHIP_KX022,
  	 .type = MOTIONSENSE_TYPE_ACCEL,
  	 .location = MOTIONSENSE_LOC_LID,
  	 .drv = &kionix_accel_drv,
  	 .mutex = &g_lid_mutex,
  	 .drv_data = &g_kx022_data,
  	 .port = I2C_PORT_LID_ACCEL,
  	 .i2c_spi_addr_flags = KX022_ADDR1_FLAGS,
  	 .rot_standard_ref = NULL, /* Identity matrix. */
  	 .default_range = 2, /* g, to support lid angle calculation. */
  	 .min_frequency = KX022_ACCEL_MIN_FREQ,
  	 .max_frequency = KX022_ACCEL_MAX_FREQ,
  	 .config = {
  		/* EC use accel for angle detection */
  		[SENSOR_CONFIG_EC_S0] = {
  			.odr = 10000 | ROUND_UP_FLAG,
  		},
  		 /* Sensor on for lid angle detection */
  		[SENSOR_CONFIG_EC_S3] = {
  			.odr = 10000 | ROUND_UP_FLAG,
  		},
  	 },
  	},
  
  	[BASE_ACCEL] = {
  	 .name = "Base Accel",
  	 .active_mask = SENSOR_ACTIVE_S0_S3,
  	 .chip = MOTIONSENSE_CHIP_BMI160,
  	 .type = MOTIONSENSE_TYPE_ACCEL,
  	 .location = MOTIONSENSE_LOC_BASE,
  	 .drv = &bmi160_drv,
  	 .mutex = &g_base_mutex,
  	 .drv_data = &g_bmi160_data,
  	 .port = I2C_PORT_GYRO,
  	 .i2c_spi_addr_flags = BMI160_ADDR0_FLAGS,
  	 .rot_standard_ref = &base_standard_ref,
  	 .default_range = 4,  /* g, to meet CDD 7.3.1/C-1-4 reqs */
  	 .min_frequency = BMI_ACCEL_MIN_FREQ,
  	 .max_frequency = BMI_ACCEL_MAX_FREQ,
  	 .config = {
  		 /* EC use accel for angle detection */
  		 [SENSOR_CONFIG_EC_S0] = {
  			.odr = 10000 | ROUND_UP_FLAG,
  			.ec_rate = 100 * MSEC,
  		 },
  		 /* Sensor on for lid angle detection */
  		 [SENSOR_CONFIG_EC_S3] = {
  			.odr = 10000 | ROUND_UP_FLAG,
  			.ec_rate = 100 * MSEC,
  		 },
  	 },
  	},
  
  	[BASE_GYRO] = {
  	 .name = "Base Gyro",
  	 .active_mask = SENSOR_ACTIVE_S0,
  	 .chip = MOTIONSENSE_CHIP_BMI160,
  	 .type = MOTIONSENSE_TYPE_GYRO,
  	 .location = MOTIONSENSE_LOC_BASE,
  	 .drv = &bmi160_drv,
  	 .mutex = &g_base_mutex,
  	 .drv_data = &g_bmi160_data,
  	 .port = I2C_PORT_GYRO,
  	 .i2c_spi_addr_flags = BMI160_ADDR0_FLAGS,
  	 .default_range = 1000, /* dps */
  	 .rot_standard_ref = &base_standard_ref,
  	 .min_frequency = BMI_GYRO_MIN_FREQ,
  	 .max_frequency = BMI_GYRO_MAX_FREQ,
  	},
  	[BASE_MAG] = {
  	 .name = "Base Mag",
  	 .active_mask = SENSOR_ACTIVE_S0,
  	 .chip = MOTIONSENSE_CHIP_BMI160,
  	 .type = MOTIONSENSE_TYPE_MAG,
  	 .location = MOTIONSENSE_LOC_BASE,
  	 .drv = &bmi160_drv,
  	 .mutex = &g_base_mutex,
  	 .drv_data = &g_bmi160_data,
  	 .port = I2C_PORT_GYRO,
  	 .i2c_spi_addr_flags = BMI160_ADDR0_FLAGS,
  	 .default_range = BIT(11), /* 16LSB / uT, fixed */
  	 .rot_standard_ref = &mag_standard_ref,
  	 .min_frequency = BMM150_MAG_MIN_FREQ,
  	 .max_frequency = BMM150_MAG_MAX_FREQ(SPECIAL),
  	},
  	[BASE_BARO] = {
  	 .name = "Base Baro",
  	 .active_mask = SENSOR_ACTIVE_S0,
  	 .chip = MOTIONSENSE_CHIP_BMP280,
  	 .type = MOTIONSENSE_TYPE_BARO,
  	 .location = MOTIONSENSE_LOC_BASE,
  	 .drv = &bmp280_drv,
  	 .drv_data = &bmp280_drv_data,
  	 .port = I2C_PORT_BARO,
  	 .i2c_spi_addr_flags = BMP280_I2C_ADDRESS1_FLAGS,
  	 .default_range = BIT(18), /*  1bit = 4 Pa, 16bit ~= 2600 hPa */
  	 .min_frequency = BMP280_BARO_MIN_FREQ,
  	 .max_frequency = BMP280_BARO_MAX_FREQ,
  	},
  	[LID_ALS] = {
  	 .name = "Light",
  	 .active_mask = SENSOR_ACTIVE_S0_S3,
  	 .chip = MOTIONSENSE_CHIP_OPT3001,
  	 .type = MOTIONSENSE_TYPE_LIGHT,
  	 .location = MOTIONSENSE_LOC_LID,
  	 .drv = &opt3001_drv,
  	 .drv_data = &g_opt3001_data,
  	 .port = I2C_PORT_ALS,
  	 .i2c_spi_addr_flags = OPT3001_I2C_ADDR1_FLAGS,
  	 .rot_standard_ref = NULL,
  	 .default_range = 0x10000, /* scale = 1; uscale = 0 */
  	 .min_frequency = OPT3001_LIGHT_MIN_FREQ,
  	 .max_frequency = OPT3001_LIGHT_MAX_FREQ,
  	 .config = {
  		[SENSOR_CONFIG_EC_S0] = {
  			.odr = 1000,
  		},
  	 },
  	},
  };
  const unsigned int motion_sensor_count = ARRAY_SIZE(motion_sensors);
  
  /*
   * MCHP: difference from firmware-reef-9042.B
   * New code doesn't have TASK_ALS
   */
  /* ALS instances when LPC mapping is needed. Each entry directs to a sensor. */
  const struct motion_sensor_t *motion_als_sensors[] = {
  	&motion_sensors[LID_ALS],
  };
  BUILD_ASSERT(ARRAY_SIZE(motion_als_sensors) == ALS_COUNT);
  
  void board_hibernate(void)
  {
  	/*
  	 * To support hibernate called from console commands, ectool commands
  	 * and key sequence, shutdown the AP before hibernating.
  	 */
  	chipset_do_shutdown();
  
  	/* Added delay to allow AP to settle down */
  	msleep(100);
  
  	/* Enable both the VBUS & VCC ports before entering PG3 */
  	bd9995x_select_input_port(BD9995X_CHARGE_PORT_BOTH, 1);
  
  	/* Turn BGATE OFF for saving the power */
  	bd9995x_set_power_save_mode(BD9995X_PWR_SAVE_MAX);
  }
  
  struct {
  	enum reef_board_version version;
  	int thresh_mv;
  } const reef_board_versions[] = {
  	/* Vin = 3.3V, R1 = 46.4K, R2 values listed below */
  	{ BOARD_VERSION_1, 328 * 1.03 },  /* 5.11 Kohm */
  	{ BOARD_VERSION_2, 670 * 1.03 },  /* 11.8 Kohm */
  	{ BOARD_VERSION_3, 1012 * 1.03 }, /* 20.5 Kohm */
  	{ BOARD_VERSION_4, 1357 * 1.03 }, /* 32.4 Kohm */
  	{ BOARD_VERSION_5, 1690 * 1.03 }, /* 48.7 Kohm */
  	{ BOARD_VERSION_6, 2020 * 1.03 }, /* 73.2 Kohm */
  	{ BOARD_VERSION_7, 2352 * 1.03 }, /* 115 Kohm */
  	{ BOARD_VERSION_8, 2802 * 1.03 }, /* 261 Kohm */
  };
  BUILD_ASSERT(ARRAY_SIZE(reef_board_versions) == BOARD_VERSION_COUNT);
  
  /*
   * Checkpatch claims msleep(n) for n < 20 can sleep up to 20 ms.
   * Loop up to 10 times sampling every 100 us. If 5 or more consecutive
   * samples are the same exit sample loop.
   */
  int board_get_version(void)
  {
  	static int version = BOARD_VERSION_UNKNOWN;
  	int mv, i, prev, cnt;
  
  	if (version != BOARD_VERSION_UNKNOWN)
  		return version;
  
  	/* FIXME(dhendrix): enable ADC */
  	gpio_set_flags(GPIO_EC_BRD_ID_EN_ODL, GPIO_ODR_HIGH);
  	gpio_set_level(GPIO_EC_BRD_ID_EN_ODL, 0);
  	/* Wait to allow cap charge */
  	prev = 0;
  	cnt = 0;
  	for (i = 0; i < 10; i++) {
  		udelay(100);
  		mv = adc_read_channel(ADC_BOARD_ID);
  		if (mv != prev) {
  			prev = mv;
  			cnt = 0;
  		} else {
  			cnt++;
  		}
  		if (cnt >= 5)
  			break;
  	}
  	/* FIXME(dhendrix): disable ADC */
  	gpio_set_level(GPIO_EC_BRD_ID_EN_ODL, 1);
  	gpio_set_flags(GPIO_EC_BRD_ID_EN_ODL, GPIO_INPUT);
  
  	if (mv == ADC_READ_ERROR) {
  		version = BOARD_VERSION_UNKNOWN;
  		return version;
  	}
  
  	for (i = 0; i < BOARD_VERSION_COUNT; i++) {
  		if (mv < reef_board_versions[i].thresh_mv) {
  			version = reef_board_versions[i].version;
  			break;
  		}
  	}
  
  	CPRINTS("Board version: %d", version);
  	return version;
  }
  
  /* Keyboard scan setting */
  struct keyboard_scan_config keyscan_config = {
  	/*
  	 * F3 key scan cycle completed but scan input is not
  	 * charging to logic high when EC start scan next
  	 * column for "T" key, so we set .output_settle_us
  	 * to 80us from 50us.
  	 */
  	.output_settle_us = 80,
  	.debounce_down_us = 9 * MSEC,
  	.debounce_up_us = 30 * MSEC,
  	.scan_period_us = 3 * MSEC,
  	.min_post_scan_delay_us = 1000,
  	.poll_timeout_us = 100 * MSEC,
  	.actual_key_mask = {
  		0x14, 0xff, 0xff, 0xff, 0xff, 0xf5, 0xff,
  		0xa4, 0xff, 0xfe, 0x55, 0xfa, 0xca  /* full set */
  	},
  };
  