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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 CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
/* Define typical operating power and max power */
#define OPERATING_POWER_MW 10000
#define MAX_POWER_MW 60000
#define MAX_CURRENT_MA 3000
#define PDO_FIXED_FLAGS (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP)
const uint32_t pd_src_pdo[] = {
PDO_FIXED(5000, 900, PDO_FIXED_FLAGS),
};
const int pd_src_pdo_cnt = ARRAY_SIZE(pd_src_pdo);
const uint32_t pd_snk_pdo[] = {
PDO_FIXED(5000, 500, PDO_FIXED_FLAGS),
PDO_BATT(5000, 20000, 10000),
PDO_VAR(5000, 20000, 3000),
};
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,
uint32_t *curr_limit, uint32_t *supply_voltage)
{
int i;
int sel_mv;
int max_uw = 0;
int max_ma;
int max_i = -1;
int max;
uint32_t flags;
/* 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;
/* build rdo for desired power */
if ((src_caps[max_i] & PDO_TYPE_MASK) == PDO_TYPE_BATTERY) {
int uw = 250000 * (src_caps[max_i] & 0x3FF);
max = MIN(1000 * uw, MAX_POWER_MW);
flags = (max < OPERATING_POWER_MW) ? RDO_CAP_MISMATCH : 0;
max_ma = 1000 * max / sel_mv;
*rdo = RDO_BATT(max_i + 1, max, max, flags);
CPRINTF("Request [%d] %dV %dmW",
max_i, sel_mv/1000, max);
} else {
int ma = 10 * (src_caps[max_i] & 0x3FF);
max = MIN(ma, MAX_CURRENT_MA);
flags = (max * sel_mv) < (1000 * OPERATING_POWER_MW) ?
RDO_CAP_MISMATCH : 0;
max_ma = max;
*rdo = RDO_FIXED(max_i + 1, max, max, flags);
CPRINTF("Request [%d] %dV %dmA",
max_i, sel_mv/1000, max);
}
/* Mismatch bit set if less power offered than the operating power */
if (flags & RDO_CAP_MISMATCH)
CPRINTF(" Mismatch");
CPRINTF("\n");
*curr_limit = max_ma;
*supply_voltage = sel_mv;
return EC_SUCCESS;
}
void pd_set_input_current_limit(int port, uint32_t max_ma,
uint32_t supply_voltage)
{
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 */
CPRINTF("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;
}
int pd_power_swap(int port)
{
/* TODO: use battery level to decide to accept/reject power swap */
/* Always allow power swap */
return 1;
}
int pd_data_swap(int port, int data_role)
{
/* Always allow data swap */
return 1;
}
void pd_execute_data_swap(int port, int data_role)
{
/* TODO: what do we need to do to change host controller data role? */
}
/* ----------------- Vendor Defined Messages ------------------ */
static int pd_custom_vdm(int port, int cnt, uint32_t *payload,
uint32_t **rpayload)
{
int cmd = PD_VDO_CMD(payload[0]);
uint16_t dev_id = 0;
CPRINTF("VDM/%d [%d] %08x\n", cnt, cmd, payload[0]);
/* make sure we have some payload */
if (cnt == 0)
return 0;
switch (cmd) {
case VDO_CMD_VERSION:
/* guarantee last byte of payload is null character */
*(payload + cnt - 1) = 0;
CPRINTF("version: %s\n", (char *)(payload+1));
break;
case VDO_CMD_READ_INFO:
case VDO_CMD_SEND_INFO:
/* if last word is present, it contains lots of info */
if (cnt == 7) {
/* TODO: Notify host */
dev_id = VDO_INFO_HW_DEV_ID(payload[6]);
CPRINTF("Dev:0x%04x SW:%d RW:%d\n", dev_id,
VDO_INFO_SW_DBG_VER(payload[6]),
VDO_INFO_IS_RW(payload[6]));
}
/* copy hash */
if (cnt >= 6)
pd_dev_store_rw_hash(port, dev_id, payload + 1);
break;
case VDO_CMD_CURRENT:
CPRINTF("Current: %dmA\n", payload[1]);
break;
case VDO_CMD_FLIP:
board_flip_usb_mux(0);
break;
}
return 0;
}
int pd_vdm(int port, int cnt, uint32_t *payload, uint32_t **rpayload)
{
if (PD_VDO_SVDM(payload[0]))
return pd_svdm(port, cnt, payload, rpayload);
else
return pd_custom_vdm(port, cnt, payload, rpayload);
}
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