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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 "charge_state.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "registers.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#include "usb_pd.h"
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
/* TODO(crosbug.com/p/28869): update source and sink tables to spec. */
const uint32_t pd_src_pdo[] = {
PDO_FIXED(5000, 500, PDO_FIXED_EXTERNAL),
PDO_FIXED(5000, 900, 0),
};
const int pd_src_pdo_cnt = ARRAY_SIZE(pd_src_pdo);
/* TODO(crosbug.com/p/28869): update source and sink tables to spec. */
const uint32_t pd_snk_pdo[] = {
PDO_BATT(4500, 5500, 15000),
PDO_BATT(11500, 12500, 36000),
};
const int pd_snk_pdo_cnt = ARRAY_SIZE(pd_snk_pdo);
/* Cap on the max voltage requested as a sink (in millivolts) */
static unsigned max_mv = -1; /* no cap */
int pd_choose_voltage(int cnt, uint32_t *src_caps, uint32_t *rdo)
{
int i;
int sel_mv;
int max_uw = 0;
int max_ma;
int max_i = -1;
/* Get max power */
for (i = 0; i < cnt; i++) {
int uw;
int mv = ((src_caps[i] >> 10) & 0x3FF) * 50;
if ((src_caps[i] & PDO_TYPE_MASK) == PDO_TYPE_BATTERY) {
uw = 250000 * (src_caps[i] & 0x3FF);
} else {
int ma = (src_caps[i] & 0x3FF) * 10;
uw = ma * mv;
}
if ((uw > max_uw) && (mv <= max_mv)) {
max_i = i;
max_uw = uw;
sel_mv = mv;
}
}
if (max_i < 0)
return -EC_ERROR_UNKNOWN;
/* request all the power ... */
if ((src_caps[max_i] & PDO_TYPE_MASK) == PDO_TYPE_BATTERY) {
int uw = 250000 * (src_caps[max_i] & 0x3FF);
max_ma = uw / sel_mv;
*rdo = RDO_BATT(max_i + 1, uw/2, uw, 0);
ccprintf("Request [%d] %dV %dmW\n",
max_i, sel_mv/1000, uw/1000);
} else {
int ma = 10 * (src_caps[max_i] & 0x3FF);
max_ma = ma;
*rdo = RDO_FIXED(max_i + 1, ma / 2, ma, 0);
ccprintf("Request [%d] %dV %dmA\n",
max_i, sel_mv/1000, ma);
}
return max_ma;
}
void pd_set_input_current_limit(uint32_t max_ma)
{
int rv = charge_set_input_current_limit(MAX(max_ma,
CONFIG_CHARGER_INPUT_CURRENT));
if (rv < 0)
CPRINTS("Failed to set input current limit for PD");
}
void pd_set_max_voltage(unsigned mv)
{
max_mv = mv;
}
int pd_request_voltage(uint32_t rdo)
{
int op_ma = rdo & 0x3FF;
int max_ma = (rdo >> 10) & 0x3FF;
int idx = rdo >> 28;
uint32_t pdo;
uint32_t pdo_ma;
if (!idx || idx > pd_src_pdo_cnt)
return EC_ERROR_INVAL; /* Invalid index */
/* check current ... */
pdo = pd_src_pdo[idx - 1];
pdo_ma = (pdo & 0x3ff);
if (op_ma > pdo_ma)
return EC_ERROR_INVAL; /* too much op current */
if (max_ma > pdo_ma)
return EC_ERROR_INVAL; /* too much max current */
ccprintf("Switch to %d V %d mA (for %d/%d mA)\n",
((pdo >> 10) & 0x3ff) * 50, (pdo & 0x3ff) * 10,
((rdo >> 10) & 0x3ff) * 10, (rdo & 0x3ff) * 10);
return EC_SUCCESS;
}
int pd_set_power_supply_ready(int port)
{
/* provide VBUS */
gpio_set_level(GPIO_USBC_5V_EN, 1);
return EC_SUCCESS; /* we are ready */
}
void pd_power_supply_reset(int port)
{
/* Kill VBUS */
gpio_set_level(GPIO_USBC_5V_EN, 0);
}
int pd_board_checks(void)
{
return EC_SUCCESS;
}
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