driver/battery/samus.c

/* Copyright (c) 2012 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.
 *
 * Battery pack vendor provided charging profile
 */

#include "battery_smart.h"
#include "charge_state.h"
#include "console.h"
#include "ec_commands.h"
#include "extpower.h"
#include "util.h"

static const struct battery_info info = {
	/*
	 * Design voltage
	 *   max    = 8.4V
	 *   normal = 7.4V
	 *   min    = 6.0V
	 */
	.voltage_max    = 8400,
	.voltage_normal = 7400,
	.voltage_min    = 6000,

	/* Pre-charge current: I <= 0.01C */
	.precharge_current  = 64, /* mA */

	/*
	 * Operational temperature range
	 *   0 <= T_charge    <= 50 deg C
	 * -20 <= T_discharge <= 60 deg C
	 */
	.start_charging_min_c = 0,
	.start_charging_max_c = 50,
	.charging_min_c       = 0,
	.charging_max_c       = 50,
	.discharging_min_c    = -20,
	.discharging_max_c    = 60,
};

const struct battery_info *battery_get_info(void)
{
	return &info;
}

#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE

static int fast_charging_allowed;

/*
 * This can override the smart battery's charging profile. To make a change,
 * modify one or more of requested_voltage, requested_current, or state.
 * Leave everything else unchanged.
 *
 * Return the next poll period in usec, or zero to use the default (which is
 * state dependent).
 */
int charger_profile_override(struct charge_state_data *curr)
{
	/* We only want to override how we charge, nothing else. */
	if (curr->state != ST_CHARGE)
		return 0;

	/* Do we want to mess with the charge profile too? */
	if (!fast_charging_allowed)
		return 0;

	/* Okay, impose our custom will */
	curr->requested_current = 9000;
	curr->requested_voltage = 8300;
	if (curr->batt.current <= 6300) {
		curr->requested_current = 6300;
		curr->requested_voltage = 8400;
	} else if (curr->batt.current <= 4500) {
		curr->requested_current = 4500;
		curr->requested_voltage = 8500;
	} else if (curr->batt.current <= 2700) {
		curr->requested_current = 2700;
		curr->requested_voltage = 8700;
	} else if (curr->batt.current <= 475) {
		/*
		 * Should we stop? If so, how do we start again?
		 * For now, just use the battery's profile.
		 */
		curr->requested_current = curr->batt.desired_current;
		curr->requested_voltage = curr->batt.desired_voltage;
	}

	return 0;
}

/* Customs options controllable by host command. */
#define PARAM_FASTCHARGE (CS_PARAM_CUSTOM_PROFILE_MIN + 0)

enum ec_status charger_profile_override_get_param(uint32_t param,
						  uint32_t *value)
{
	if (param == PARAM_FASTCHARGE) {
		*value = fast_charging_allowed;
		return EC_RES_SUCCESS;
	}
	return EC_RES_INVALID_PARAM;
}

enum ec_status charger_profile_override_set_param(uint32_t param,
						  uint32_t value)
{
	if (param == PARAM_FASTCHARGE) {
		fast_charging_allowed = value;
		return EC_RES_SUCCESS;
	}
	return EC_RES_INVALID_PARAM;
}

static int command_fastcharge(int argc, char **argv)
{
	if (argc > 1 && !parse_bool(argv[1], &fast_charging_allowed))
		return EC_ERROR_PARAM1;

	ccprintf("fastcharge %s\n", fast_charging_allowed ? "on" : "off");

	return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(fastcharge, command_fastcharge,
			"[on|off]",
			"Get or set fast charging profile",
			NULL);

#endif	/* CONFIG_CHARGER_PROFILE_OVERRIDE */

#ifdef CONFIG_BATTERY_REVIVE_DISCONNECT
/*
 * Check if battery is in disconnect state, a state entered by pulling
 * BATT_DISCONN_N low, and clear that state if we have external power plugged
 * and no battery faults are detected. Disconnect state resembles battery
 * shutdown mode, but extra steps must be taken to get the battery out of this
 * mode.
 */
enum battery_disconnect_state battery_get_disconnect_state(void)
{
	uint8_t data[6];
	int rv;
	/*
	 * Take note if we find that the battery isn't in disconnect state,
	 * and always return NOT_DISCONNECTED without probing the battery.
	 * This assumes the battery will not go to disconnect state during
	 * runtime.
	 */
	static int not_disconnected;

	if (not_disconnected)
		return BATTERY_NOT_DISCONNECTED;

	if (extpower_is_present()) {
		/* Check if battery charging + discharging is disabled. */
		rv = sb_write(SB_MANUFACTURER_ACCESS, PARAM_OPERATION_STATUS);
		if (rv)
			return BATTERY_DISCONNECT_ERROR;

		rv = sb_read_string(I2C_PORT_BATTERY, BATTERY_ADDR,
				    SB_ALT_MANUFACTURER_ACCESS, data, 6);

		if (rv || !(data[3] & BATTERY_DISCHARGING_DISABLED) ||
		    !(data[3] & BATTERY_CHARGING_DISABLED)) {
			not_disconnected = 1;
			return BATTERY_NOT_DISCONNECTED;
		}

		/*
		 * Battery is neither charging nor discharging. Verify that
		 * we didn't enter this state due to a safety fault.
		 */
		rv = sb_write(SB_MANUFACTURER_ACCESS, PARAM_SAFETY_STATUS);
		if (rv)
			return BATTERY_DISCONNECT_ERROR;

		rv = sb_read_string(I2C_PORT_BATTERY, BATTERY_ADDR,
				    SB_ALT_MANUFACTURER_ACCESS, data, 6);

		if (rv || data[2] || data[3] || data[4] || data[5])
			return BATTERY_DISCONNECT_ERROR;
		else
			/* No safety fault -- clear disconnect state. */
			return BATTERY_DISCONNECTED;
	}
	not_disconnected = 1;
	return BATTERY_NOT_DISCONNECTED;
}
#endif /* CONFIG_BATTERY_REVIVE_DISCONNECT */