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/* Copyright (c) 2013 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.
*
* Smart battery driver for Spring.
*/
#include "battery_pack.h"
#include "chipset.h"
#include "clock.h"
#include "console.h"
#include "hooks.h"
#include "host_command.h"
#include "i2c.h"
#include "pmu_tpschrome.h"
#include "smart_battery.h"
#include "timer.h"
#include "util.h"
#define PARAM_CUT_OFF_LOW 0x10
#define PARAM_CUT_OFF_HIGH 0x00
#ifndef BATTERY_CUT_OFF_MAH
#define BATTERY_CUT_OFF_MAH 0
#endif
#ifndef BATTERY_CUT_OFF_DELAY
#define BATTERY_CUT_OFF_DELAY 0
#endif
#ifndef BATTERY_CELL_CUT_OFF_MV
#define BATTERY_CELL_CUT_OFF_MV 0
#endif
static timestamp_t last_cutoff;
static int has_cutoff;
static int pending_cutoff;
int battery_cut_off(void)
{
int rv;
uint8_t buf[3];
buf[0] = SB_MANUFACTURER_ACCESS & 0xff;
buf[1] = PARAM_CUT_OFF_LOW;
buf[2] = PARAM_CUT_OFF_HIGH;
i2c_lock();
rv = i2c_xfer(I2C_PORT_BATTERY, BATTERY_ADDR, buf, 3, NULL, 0);
rv = i2c_xfer(I2C_PORT_BATTERY, BATTERY_ADDR, buf, 3, NULL, 0);
i2c_unlock();
has_cutoff = 1;
last_cutoff = get_time();
return rv;
}
int battery_is_cut_off(void)
{
return has_cutoff &&
get_time().val - last_cutoff.val < BATTERY_CUT_OFF_DELAY;
}
static int battery_want_cut_off(void)
{
int charge;
int i, v;
if (battery_is_cut_off())
return 0;
if (chipset_in_state(CHIPSET_STATE_ON | CHIPSET_STATE_SUSPEND))
return 0;
if (board_get_ac())
return 0;
if (BATTERY_CUT_OFF_MAH)
if (!battery_remaining_capacity(&charge) &&
charge < BATTERY_CUT_OFF_MAH)
return 1;
if (BATTERY_CELL_CUT_OFF_MV) {
for (i = 0x3d; i <= 0x3f; ++i) {
if (sb_read(i, &v))
continue;
if (v < BATTERY_CELL_CUT_OFF_MV)
return 1;
}
}
return 0;
}
int battery_check_cut_off(void)
{
if (!battery_want_cut_off())
return 0;
ccprintf("[%T Cutting off battery]\n");
cflush();
battery_cut_off();
return 1;
}
static void cut_off_wrapper(void)
{
battery_cut_off();
}
DECLARE_DEFERRED(cut_off_wrapper);
static void check_pending_cutoff(void)
{
if (pending_cutoff)
hook_call_deferred(cut_off_wrapper, 5);
}
DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, check_pending_cutoff, HOOK_PRIO_LAST);
int battery_command_cut_off(struct host_cmd_handler_args *args)
{
pending_cutoff = 1;
/*
* When cutting off the battery, the AP is off and AC is not present.
* This makes serial console unresponsive and hard to verify battery
* cut-off. Let's disable sleep here so one can check cut-off status
* if needed. This shouldn't matter because we are about to cut off
* the battery.
*/
disable_sleep(SLEEP_MASK_FORCE);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_BATTERY_CUT_OFF, battery_command_cut_off,
EC_VER_MASK(0));
static int command_cutoff(int argc, char **argv)
{
int tries = 5;
while (board_get_ac() && tries) {
ccprintf("Remove AC power in %d seconds...\n", tries);
tries--;
usleep(SECOND);
}
if (board_get_ac())
return EC_ERROR_UNKNOWN;
ccprintf("Cutting off. Please wait for 10 seconds.\n");
return battery_cut_off();
}
DECLARE_CONSOLE_COMMAND(cutoff, command_cutoff, NULL,
"Cut off the battery", NULL);
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