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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)
/* Acceptable margin between requested VBUS and measured value */
#define MARGIN_MV 400 /* mV */
/* we are not acting as a source */
const uint32_t pd_src_pdo[] = {
PDO_FIXED(5000, 500, PDO_FIXED_EXTERNAL),
};
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, 0),
PDO_FIXED(12000, 500, 0),
PDO_FIXED(20000, 500, 0),
};
const int pd_snk_pdo_cnt = ARRAY_SIZE(pd_snk_pdo);
/* Desired voltage requested as a sink (in millivolts) */
static unsigned select_mv = -1; /* no valid selection */
int pd_choose_voltage(int cnt, uint32_t *src_caps, uint32_t *rdo)
{
int i;
int ma;
int set_mv = select_mv;
/* Default to 5V */
if (set_mv <= 0)
set_mv = 5000;
/* Get the selected voltage */
for (i = cnt; i >= 0; i--) {
int mv = ((src_caps[i] >> 10) & 0x3FF) * 50;
int type = src_caps[i] & PDO_TYPE_MASK;
if ((mv == set_mv) && (type == PDO_TYPE_FIXED))
break;
}
if (i < 0)
return -EC_ERROR_UNKNOWN;
/* request all the power ... */
ma = 10 * (src_caps[i] & 0x3FF);
*rdo = RDO_FIXED(i + 1, ma, ma, 0);
ccprintf("Request [%d] %d V %d mA\n", i, set_mv/1000, ma);
return EC_SUCCESS;
}
void pd_set_max_voltage(unsigned mv)
{
select_mv = mv;
}
int pd_request_voltage(uint32_t rdo)
{
/* Never acting as a source */
return EC_ERROR_INVAL;
}
int pd_set_power_supply_ready(void)
{
/* Never acting as a source */
return EC_ERROR_INVAL;
}
void pd_power_supply_reset(void)
{
}
int pd_board_checks(void)
{
static int blinking;
int vbus;
int led5 = 0, led12 = 0, led20 = 0;
/* 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;
}
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