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/* Copyright (c) 2014 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 "adc.h"
#include "board.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "registers.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#include "usb_pd.h"
#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
/* Acceptable margin between requested VBUS and measured value */
#define MARGIN_MV 400 /* mV */
#define PDO_FIXED_FLAGS (PDO_FIXED_EXTERNAL)
/* we are not acting as a source */
const uint32_t pd_src_pdo[] = {
PDO_FIXED(5000, 500, PDO_FIXED_FLAGS),
};
const int pd_src_pdo_cnt = ARRAY_SIZE(pd_src_pdo);
/* Fake PDOs : we just want our pre-defined voltages */
const uint32_t pd_snk_pdo[] = {
PDO_FIXED(5000, 500, PDO_FIXED_FLAGS),
PDO_FIXED(12000, 500, PDO_FIXED_FLAGS),
PDO_FIXED(20000, 500, PDO_FIXED_FLAGS),
};
const int pd_snk_pdo_cnt = ARRAY_SIZE(pd_snk_pdo);
void pd_set_input_current_limit(int port, uint32_t max_ma,
uint32_t supply_voltage)
{
/* No battery, nothing to do */
return;
}
int pd_is_valid_input_voltage(int mv)
{
/* Any voltage less than the max is allowed */
return 1;
}
int pd_check_requested_voltage(uint32_t rdo)
{
/* Never acting as a source */
return EC_ERROR_INVAL;
}
void pd_transition_voltage(int idx)
{
/* No operation: sink only */
}
int pd_set_power_supply_ready(int port)
{
/* Never acting as a source */
return EC_ERROR_INVAL;
}
void pd_power_supply_reset(int port)
{
}
int pd_snk_is_vbus_provided(int port)
{
/* VBUS_WAKE is broken (not detecting 5V), use the ADC instead */
return adc_read_channel(ADC_CH_VBUS_SENSE) > 4000;
}
int pd_board_checks(void)
{
static int blinking;
int vbus;
int led5 = 0, led12 = 0, led20 = 0;
unsigned select_mv = pd_get_max_voltage();
/* LED blinking state for the default indicator */
blinking = (blinking + 1) & 3;
vbus = adc_read_channel(ADC_CH_VBUS_SENSE);
if (select_mv > 0) {
/* is current VBUS voltage matching the request ? */
int diff = vbus - select_mv;
int correct = (diff < MARGIN_MV) && (diff > -MARGIN_MV);
/*
* turn on the LED if the voltage is correct
* or we are in on-period of the duty cycle.
*/
int led_value = correct || !blinking;
/* decide which LED is used */
switch (select_mv) {
case 5000:
led5 = led_value;
break;
case 12000:
led12 = led_value;
break;
case 20000:
led20 = led_value;
break;
}
}
/* switch LEDs */
gpio_set_level(GPIO_LED_PP5000, led5);
gpio_set_level(GPIO_LED_PP12000, led12);
gpio_set_level(GPIO_LED_PP20000, led20);
return EC_SUCCESS;
}
int pd_check_power_swap(int port)
{
/* Always refuse power swap */
return 0;
}
int pd_check_data_swap(int port, int data_role)
{
/* Always refuse data swap */
return 0;
}
void pd_execute_data_swap(int port, int data_role)
{
/* Do nothing */
}
void pd_check_pr_role(int port, int pr_role, int flags)
{
}
void pd_check_dr_role(int port, int dr_role, int flags)
{
}
int pd_custom_vdm(int port, int cnt, uint32_t *payload,
uint32_t **rpayload)
{
return 0;
}
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