![Pierre Bourdon](/assets/img/avatar_default.png)
max17042_get_status uses the core power_supply_am_i_supplied. That function relies on DT properties to figure out the power supply topology, and will error out without DT. Fixes max17042 battery status being reported as "unknown". Signed-off-by: Pierre Bourdon <delroth@google.com> Signed-off-by: Andre Heider <a.heider@gmail.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
1202 lines
32 KiB
C
1202 lines
32 KiB
C
/*
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* Fuel gauge driver for Maxim 17042 / 8966 / 8997
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* Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
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*
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* Copyright (C) 2011 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This driver is based on max17040_battery.c
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*/
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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <linux/mod_devicetable.h>
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#include <linux/power_supply.h>
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#include <linux/power/max17042_battery.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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/* Status register bits */
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#define STATUS_POR_BIT (1 << 1)
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#define STATUS_BST_BIT (1 << 3)
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#define STATUS_VMN_BIT (1 << 8)
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#define STATUS_TMN_BIT (1 << 9)
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#define STATUS_SMN_BIT (1 << 10)
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#define STATUS_BI_BIT (1 << 11)
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#define STATUS_VMX_BIT (1 << 12)
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#define STATUS_TMX_BIT (1 << 13)
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#define STATUS_SMX_BIT (1 << 14)
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#define STATUS_BR_BIT (1 << 15)
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/* Interrupt mask bits */
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#define CONFIG_ALRT_BIT_ENBL (1 << 2)
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#define STATUS_INTR_SOCMIN_BIT (1 << 10)
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#define STATUS_INTR_SOCMAX_BIT (1 << 14)
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#define VFSOC0_LOCK 0x0000
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#define VFSOC0_UNLOCK 0x0080
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#define MODEL_UNLOCK1 0X0059
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#define MODEL_UNLOCK2 0X00C4
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#define MODEL_LOCK1 0X0000
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#define MODEL_LOCK2 0X0000
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#define dQ_ACC_DIV 0x4
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#define dP_ACC_100 0x1900
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#define dP_ACC_200 0x3200
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#define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
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struct max17042_chip {
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struct i2c_client *client;
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struct regmap *regmap;
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struct power_supply *battery;
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enum max170xx_chip_type chip_type;
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struct max17042_platform_data *pdata;
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struct work_struct work;
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int init_complete;
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};
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static enum power_supply_property max17042_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CYCLE_COUNT,
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POWER_SUPPLY_PROP_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_VOLTAGE_MIN,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_AVG,
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POWER_SUPPLY_PROP_VOLTAGE_OCV,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_COUNTER,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
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POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
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POWER_SUPPLY_PROP_TEMP_MIN,
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POWER_SUPPLY_PROP_TEMP_MAX,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_SCOPE,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CURRENT_AVG,
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};
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static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
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{
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int ret;
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u32 data;
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struct regmap *map = chip->regmap;
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ret = regmap_read(map, MAX17042_TEMP, &data);
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if (ret < 0)
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return ret;
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*temp = sign_extend32(data, 15);
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/* The value is converted into deci-centigrade scale */
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/* Units of LSB = 1 / 256 degree Celsius */
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*temp = *temp * 10 / 256;
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return 0;
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}
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static int max17042_get_status(struct max17042_chip *chip, int *status)
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{
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int ret, charge_full, charge_now;
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int avg_current;
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u32 data;
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ret = power_supply_am_i_supplied(chip->battery);
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if (ret < 0) {
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*status = POWER_SUPPLY_STATUS_UNKNOWN;
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return 0;
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}
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if (ret == 0) {
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*status = POWER_SUPPLY_STATUS_DISCHARGING;
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return 0;
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}
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/*
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* The MAX170xx has builtin end-of-charge detection and will update
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* FullCAP to match RepCap when it detects end of charging.
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*
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* When this cycle the battery gets charged to a higher (calculated)
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* capacity then the previous cycle then FullCAP will get updated
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* contineously once end-of-charge detection kicks in, so allow the
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* 2 to differ a bit.
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*/
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ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
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if (ret < 0)
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return ret;
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ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
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if (ret < 0)
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return ret;
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if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD) {
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*status = POWER_SUPPLY_STATUS_FULL;
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return 0;
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}
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/*
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* Even though we are supplied, we may still be discharging if the
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* supply is e.g. only delivering 5V 0.5A. Check current if available.
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*/
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if (!chip->pdata->enable_current_sense) {
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*status = POWER_SUPPLY_STATUS_CHARGING;
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return 0;
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}
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ret = regmap_read(chip->regmap, MAX17042_AvgCurrent, &data);
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if (ret < 0)
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return ret;
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avg_current = sign_extend32(data, 15);
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avg_current *= 1562500 / chip->pdata->r_sns;
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if (avg_current > 0)
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*status = POWER_SUPPLY_STATUS_CHARGING;
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else
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*status = POWER_SUPPLY_STATUS_DISCHARGING;
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return 0;
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}
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static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
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{
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int temp, vavg, vbatt, ret;
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u32 val;
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ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
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if (ret < 0)
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goto health_error;
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/* bits [0-3] unused */
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vavg = val * 625 / 8;
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/* Convert to millivolts */
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vavg /= 1000;
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ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
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if (ret < 0)
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goto health_error;
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/* bits [0-3] unused */
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vbatt = val * 625 / 8;
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/* Convert to millivolts */
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vbatt /= 1000;
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if (vavg < chip->pdata->vmin) {
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*health = POWER_SUPPLY_HEALTH_DEAD;
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goto out;
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}
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if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
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*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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goto out;
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}
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ret = max17042_get_temperature(chip, &temp);
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if (ret < 0)
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goto health_error;
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if (temp < chip->pdata->temp_min) {
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*health = POWER_SUPPLY_HEALTH_COLD;
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goto out;
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}
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if (temp > chip->pdata->temp_max) {
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*health = POWER_SUPPLY_HEALTH_OVERHEAT;
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goto out;
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}
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*health = POWER_SUPPLY_HEALTH_GOOD;
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out:
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return 0;
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health_error:
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return ret;
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}
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static int max17042_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct max17042_chip *chip = power_supply_get_drvdata(psy);
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struct regmap *map = chip->regmap;
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int ret;
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u32 data;
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u64 data64;
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if (!chip->init_complete)
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return -EAGAIN;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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ret = max17042_get_status(chip, &val->intval);
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if (ret < 0)
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return ret;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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ret = regmap_read(map, MAX17042_STATUS, &data);
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if (ret < 0)
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return ret;
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if (data & MAX17042_STATUS_BattAbsent)
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val->intval = 0;
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else
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val->intval = 1;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
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break;
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case POWER_SUPPLY_PROP_CYCLE_COUNT:
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ret = regmap_read(map, MAX17042_Cycles, &data);
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if (ret < 0)
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return ret;
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val->intval = data;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX:
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ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
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if (ret < 0)
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return ret;
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val->intval = data >> 8;
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val->intval *= 20000; /* Units of LSB = 20mV */
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN:
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ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
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if (ret < 0)
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return ret;
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val->intval = (data & 0xff) * 20000; /* Units of 20mV */
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
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ret = regmap_read(map, MAX17042_V_empty, &data);
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else
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ret = regmap_read(map, MAX17047_V_empty, &data);
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if (ret < 0)
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return ret;
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val->intval = data >> 7;
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val->intval *= 10000; /* Units of LSB = 10mV */
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = regmap_read(map, MAX17042_VCELL, &data);
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if (ret < 0)
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return ret;
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val->intval = data * 625 / 8;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_AVG:
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ret = regmap_read(map, MAX17042_AvgVCELL, &data);
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if (ret < 0)
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return ret;
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val->intval = data * 625 / 8;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_OCV:
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ret = regmap_read(map, MAX17042_OCVInternal, &data);
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if (ret < 0)
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return ret;
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val->intval = data * 625 / 8;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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ret = regmap_read(map, MAX17042_RepSOC, &data);
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if (ret < 0)
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return ret;
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val->intval = data >> 8;
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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ret = regmap_read(map, MAX17042_DesignCap, &data);
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if (ret < 0)
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return ret;
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data64 = data * 5000000ll;
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do_div(data64, chip->pdata->r_sns);
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val->intval = data64;
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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ret = regmap_read(map, MAX17042_FullCAP, &data);
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if (ret < 0)
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return ret;
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data64 = data * 5000000ll;
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do_div(data64, chip->pdata->r_sns);
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val->intval = data64;
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break;
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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ret = regmap_read(map, MAX17042_RepCap, &data);
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if (ret < 0)
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return ret;
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data64 = data * 5000000ll;
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do_div(data64, chip->pdata->r_sns);
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val->intval = data64;
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break;
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case POWER_SUPPLY_PROP_CHARGE_COUNTER:
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ret = regmap_read(map, MAX17042_QH, &data);
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if (ret < 0)
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return ret;
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val->intval = data * 1000 / 2;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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ret = max17042_get_temperature(chip, &val->intval);
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if (ret < 0)
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return ret;
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break;
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case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
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ret = regmap_read(map, MAX17042_TALRT_Th, &data);
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if (ret < 0)
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return ret;
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/* LSB is Alert Minimum. In deci-centigrade */
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val->intval = sign_extend32(data & 0xff, 7) * 10;
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break;
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case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
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ret = regmap_read(map, MAX17042_TALRT_Th, &data);
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if (ret < 0)
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return ret;
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/* MSB is Alert Maximum. In deci-centigrade */
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val->intval = sign_extend32(data >> 8, 7) * 10;
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break;
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case POWER_SUPPLY_PROP_TEMP_MIN:
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val->intval = chip->pdata->temp_min;
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break;
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case POWER_SUPPLY_PROP_TEMP_MAX:
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val->intval = chip->pdata->temp_max;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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ret = max17042_get_battery_health(chip, &val->intval);
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if (ret < 0)
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return ret;
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break;
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case POWER_SUPPLY_PROP_SCOPE:
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val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
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break;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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if (chip->pdata->enable_current_sense) {
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ret = regmap_read(map, MAX17042_Current, &data);
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if (ret < 0)
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return ret;
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val->intval = sign_extend32(data, 15);
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val->intval *= 1562500 / chip->pdata->r_sns;
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} else {
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return -EINVAL;
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}
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break;
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case POWER_SUPPLY_PROP_CURRENT_AVG:
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if (chip->pdata->enable_current_sense) {
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ret = regmap_read(map, MAX17042_AvgCurrent, &data);
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if (ret < 0)
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return ret;
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val->intval = sign_extend32(data, 15);
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val->intval *= 1562500 / chip->pdata->r_sns;
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} else {
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return -EINVAL;
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}
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int max17042_set_property(struct power_supply *psy,
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enum power_supply_property psp,
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const union power_supply_propval *val)
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{
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struct max17042_chip *chip = power_supply_get_drvdata(psy);
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struct regmap *map = chip->regmap;
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int ret = 0;
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u32 data;
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int8_t temp;
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switch (psp) {
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case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
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ret = regmap_read(map, MAX17042_TALRT_Th, &data);
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if (ret < 0)
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return ret;
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/* Input in deci-centigrade, convert to centigrade */
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temp = val->intval / 10;
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/* force min < max */
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if (temp >= (int8_t)(data >> 8))
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temp = (int8_t)(data >> 8) - 1;
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/* Write both MAX and MIN ALERT */
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data = (data & 0xff00) + temp;
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ret = regmap_write(map, MAX17042_TALRT_Th, data);
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break;
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case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
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ret = regmap_read(map, MAX17042_TALRT_Th, &data);
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if (ret < 0)
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return ret;
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/* Input in Deci-Centigrade, convert to centigrade */
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temp = val->intval / 10;
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/* force max > min */
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if (temp <= (int8_t)(data & 0xff))
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temp = (int8_t)(data & 0xff) + 1;
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/* Write both MAX and MIN ALERT */
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data = (data & 0xff) + (temp << 8);
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ret = regmap_write(map, MAX17042_TALRT_Th, data);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static int max17042_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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int ret;
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|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
|
|
case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
|
|
ret = 1;
|
|
break;
|
|
default:
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void max17042_external_power_changed(struct power_supply *psy)
|
|
{
|
|
power_supply_changed(psy);
|
|
}
|
|
|
|
static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
|
|
{
|
|
int retries = 8;
|
|
int ret;
|
|
u32 read_value;
|
|
|
|
do {
|
|
ret = regmap_write(map, reg, value);
|
|
regmap_read(map, reg, &read_value);
|
|
if (read_value != value) {
|
|
ret = -EIO;
|
|
retries--;
|
|
}
|
|
} while (retries && read_value != value);
|
|
|
|
if (ret < 0)
|
|
pr_err("%s: err %d\n", __func__, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void max17042_override_por(struct regmap *map,
|
|
u8 reg, u16 value)
|
|
{
|
|
if (value)
|
|
regmap_write(map, reg, value);
|
|
}
|
|
|
|
static inline void max10742_unlock_model(struct max17042_chip *chip)
|
|
{
|
|
struct regmap *map = chip->regmap;
|
|
|
|
regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
|
|
regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
|
|
}
|
|
|
|
static inline void max10742_lock_model(struct max17042_chip *chip)
|
|
{
|
|
struct regmap *map = chip->regmap;
|
|
|
|
regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
|
|
regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
|
|
}
|
|
|
|
static inline void max17042_write_model_data(struct max17042_chip *chip,
|
|
u8 addr, int size)
|
|
{
|
|
struct regmap *map = chip->regmap;
|
|
int i;
|
|
|
|
for (i = 0; i < size; i++)
|
|
regmap_write(map, addr + i,
|
|
chip->pdata->config_data->cell_char_tbl[i]);
|
|
}
|
|
|
|
static inline void max17042_read_model_data(struct max17042_chip *chip,
|
|
u8 addr, u16 *data, int size)
|
|
{
|
|
struct regmap *map = chip->regmap;
|
|
int i;
|
|
u32 tmp;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
regmap_read(map, addr + i, &tmp);
|
|
data[i] = (u16)tmp;
|
|
}
|
|
}
|
|
|
|
static inline int max17042_model_data_compare(struct max17042_chip *chip,
|
|
u16 *data1, u16 *data2, int size)
|
|
{
|
|
int i;
|
|
|
|
if (memcmp(data1, data2, size)) {
|
|
dev_err(&chip->client->dev, "%s compare failed\n", __func__);
|
|
for (i = 0; i < size; i++)
|
|
dev_info(&chip->client->dev, "0x%x, 0x%x",
|
|
data1[i], data2[i]);
|
|
dev_info(&chip->client->dev, "\n");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int max17042_init_model(struct max17042_chip *chip)
|
|
{
|
|
int ret;
|
|
int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
|
|
u16 *temp_data;
|
|
|
|
temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
|
|
if (!temp_data)
|
|
return -ENOMEM;
|
|
|
|
max10742_unlock_model(chip);
|
|
max17042_write_model_data(chip, MAX17042_MODELChrTbl,
|
|
table_size);
|
|
max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
|
|
table_size);
|
|
|
|
ret = max17042_model_data_compare(
|
|
chip,
|
|
chip->pdata->config_data->cell_char_tbl,
|
|
temp_data,
|
|
table_size);
|
|
|
|
max10742_lock_model(chip);
|
|
kfree(temp_data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int max17042_verify_model_lock(struct max17042_chip *chip)
|
|
{
|
|
int i;
|
|
int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
|
|
u16 *temp_data;
|
|
int ret = 0;
|
|
|
|
temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
|
|
if (!temp_data)
|
|
return -ENOMEM;
|
|
|
|
max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
|
|
table_size);
|
|
for (i = 0; i < table_size; i++)
|
|
if (temp_data[i])
|
|
ret = -EINVAL;
|
|
|
|
kfree(temp_data);
|
|
return ret;
|
|
}
|
|
|
|
static void max17042_write_config_regs(struct max17042_chip *chip)
|
|
{
|
|
struct max17042_config_data *config = chip->pdata->config_data;
|
|
struct regmap *map = chip->regmap;
|
|
|
|
regmap_write(map, MAX17042_CONFIG, config->config);
|
|
regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
|
|
regmap_write(map, MAX17042_FilterCFG,
|
|
config->filter_cfg);
|
|
regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
|
|
if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
|
|
chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
|
|
regmap_write(map, MAX17047_FullSOCThr,
|
|
config->full_soc_thresh);
|
|
}
|
|
|
|
static void max17042_write_custom_regs(struct max17042_chip *chip)
|
|
{
|
|
struct max17042_config_data *config = chip->pdata->config_data;
|
|
struct regmap *map = chip->regmap;
|
|
|
|
max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
|
|
max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
|
|
max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
|
|
if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
|
|
regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
|
|
max17042_write_verify_reg(map, MAX17042_K_empty0,
|
|
config->kempty0);
|
|
} else {
|
|
max17042_write_verify_reg(map, MAX17047_QRTbl00,
|
|
config->qrtbl00);
|
|
max17042_write_verify_reg(map, MAX17047_QRTbl10,
|
|
config->qrtbl10);
|
|
max17042_write_verify_reg(map, MAX17047_QRTbl20,
|
|
config->qrtbl20);
|
|
max17042_write_verify_reg(map, MAX17047_QRTbl30,
|
|
config->qrtbl30);
|
|
}
|
|
}
|
|
|
|
static void max17042_update_capacity_regs(struct max17042_chip *chip)
|
|
{
|
|
struct max17042_config_data *config = chip->pdata->config_data;
|
|
struct regmap *map = chip->regmap;
|
|
|
|
max17042_write_verify_reg(map, MAX17042_FullCAP,
|
|
config->fullcap);
|
|
regmap_write(map, MAX17042_DesignCap, config->design_cap);
|
|
max17042_write_verify_reg(map, MAX17042_FullCAPNom,
|
|
config->fullcapnom);
|
|
}
|
|
|
|
static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
|
|
{
|
|
unsigned int vfSoc;
|
|
struct regmap *map = chip->regmap;
|
|
|
|
regmap_read(map, MAX17042_VFSOC, &vfSoc);
|
|
regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
|
|
max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
|
|
regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
|
|
}
|
|
|
|
static void max17042_load_new_capacity_params(struct max17042_chip *chip)
|
|
{
|
|
u32 full_cap0, rep_cap, dq_acc, vfSoc;
|
|
u32 rem_cap;
|
|
|
|
struct max17042_config_data *config = chip->pdata->config_data;
|
|
struct regmap *map = chip->regmap;
|
|
|
|
regmap_read(map, MAX17042_FullCAP0, &full_cap0);
|
|
regmap_read(map, MAX17042_VFSOC, &vfSoc);
|
|
|
|
/* fg_vfSoc needs to shifted by 8 bits to get the
|
|
* perc in 1% accuracy, to get the right rem_cap multiply
|
|
* full_cap0, fg_vfSoc and devide by 100
|
|
*/
|
|
rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
|
|
max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
|
|
|
|
rep_cap = rem_cap;
|
|
max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
|
|
|
|
/* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
|
|
dq_acc = config->fullcap / dQ_ACC_DIV;
|
|
max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
|
|
max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
|
|
|
|
max17042_write_verify_reg(map, MAX17042_FullCAP,
|
|
config->fullcap);
|
|
regmap_write(map, MAX17042_DesignCap,
|
|
config->design_cap);
|
|
max17042_write_verify_reg(map, MAX17042_FullCAPNom,
|
|
config->fullcapnom);
|
|
/* Update SOC register with new SOC */
|
|
regmap_write(map, MAX17042_RepSOC, vfSoc);
|
|
}
|
|
|
|
/*
|
|
* Block write all the override values coming from platform data.
|
|
* This function MUST be called before the POR initialization proceedure
|
|
* specified by maxim.
|
|
*/
|
|
static inline void max17042_override_por_values(struct max17042_chip *chip)
|
|
{
|
|
struct regmap *map = chip->regmap;
|
|
struct max17042_config_data *config = chip->pdata->config_data;
|
|
|
|
max17042_override_por(map, MAX17042_TGAIN, config->tgain);
|
|
max17042_override_por(map, MAx17042_TOFF, config->toff);
|
|
max17042_override_por(map, MAX17042_CGAIN, config->cgain);
|
|
max17042_override_por(map, MAX17042_COFF, config->coff);
|
|
|
|
max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
|
|
max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
|
|
max17042_override_por(map, MAX17042_SALRT_Th,
|
|
config->soc_alrt_thresh);
|
|
max17042_override_por(map, MAX17042_CONFIG, config->config);
|
|
max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
|
|
|
|
max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
|
|
max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
|
|
|
|
max17042_override_por(map, MAX17042_AtRate, config->at_rate);
|
|
max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
|
|
max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
|
|
max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
|
|
max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
|
|
max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
|
|
|
|
max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
|
|
max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
|
|
if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
|
|
max17042_override_por(map, MAX17042_SOC_empty,
|
|
config->socempty);
|
|
max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
|
|
max17042_override_por(map, MAX17042_dQacc, config->dqacc);
|
|
max17042_override_por(map, MAX17042_dPacc, config->dpacc);
|
|
|
|
if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
|
|
max17042_override_por(map, MAX17042_V_empty, config->vempty);
|
|
else
|
|
max17042_override_por(map, MAX17047_V_empty, config->vempty);
|
|
max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
|
|
max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
|
|
max17042_override_por(map, MAX17042_FCTC, config->fctc);
|
|
max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
|
|
max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
|
|
if (chip->chip_type) {
|
|
max17042_override_por(map, MAX17042_EmptyTempCo,
|
|
config->empty_tempco);
|
|
max17042_override_por(map, MAX17042_K_empty0,
|
|
config->kempty0);
|
|
}
|
|
}
|
|
|
|
static int max17042_init_chip(struct max17042_chip *chip)
|
|
{
|
|
struct regmap *map = chip->regmap;
|
|
int ret;
|
|
|
|
max17042_override_por_values(chip);
|
|
/* After Power up, the MAX17042 requires 500mS in order
|
|
* to perform signal debouncing and initial SOC reporting
|
|
*/
|
|
msleep(500);
|
|
|
|
/* Initialize configaration */
|
|
max17042_write_config_regs(chip);
|
|
|
|
/* write cell characterization data */
|
|
ret = max17042_init_model(chip);
|
|
if (ret) {
|
|
dev_err(&chip->client->dev, "%s init failed\n",
|
|
__func__);
|
|
return -EIO;
|
|
}
|
|
|
|
ret = max17042_verify_model_lock(chip);
|
|
if (ret) {
|
|
dev_err(&chip->client->dev, "%s lock verify failed\n",
|
|
__func__);
|
|
return -EIO;
|
|
}
|
|
/* write custom parameters */
|
|
max17042_write_custom_regs(chip);
|
|
|
|
/* update capacity params */
|
|
max17042_update_capacity_regs(chip);
|
|
|
|
/* delay must be atleast 350mS to allow VFSOC
|
|
* to be calculated from the new configuration
|
|
*/
|
|
msleep(350);
|
|
|
|
/* reset vfsoc0 reg */
|
|
max17042_reset_vfsoc0_reg(chip);
|
|
|
|
/* load new capacity params */
|
|
max17042_load_new_capacity_params(chip);
|
|
|
|
/* Init complete, Clear the POR bit */
|
|
regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
|
|
return 0;
|
|
}
|
|
|
|
static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
|
|
{
|
|
struct regmap *map = chip->regmap;
|
|
u32 soc, soc_tr;
|
|
|
|
/* program interrupt thesholds such that we should
|
|
* get interrupt for every 'off' perc change in the soc
|
|
*/
|
|
regmap_read(map, MAX17042_RepSOC, &soc);
|
|
soc >>= 8;
|
|
soc_tr = (soc + off) << 8;
|
|
soc_tr |= (soc - off);
|
|
regmap_write(map, MAX17042_SALRT_Th, soc_tr);
|
|
}
|
|
|
|
static irqreturn_t max17042_thread_handler(int id, void *dev)
|
|
{
|
|
struct max17042_chip *chip = dev;
|
|
u32 val;
|
|
|
|
regmap_read(chip->regmap, MAX17042_STATUS, &val);
|
|
if ((val & STATUS_INTR_SOCMIN_BIT) ||
|
|
(val & STATUS_INTR_SOCMAX_BIT)) {
|
|
dev_info(&chip->client->dev, "SOC threshold INTR\n");
|
|
max17042_set_soc_threshold(chip, 1);
|
|
}
|
|
|
|
power_supply_changed(chip->battery);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void max17042_init_worker(struct work_struct *work)
|
|
{
|
|
struct max17042_chip *chip = container_of(work,
|
|
struct max17042_chip, work);
|
|
int ret;
|
|
|
|
/* Initialize registers according to values from the platform data */
|
|
if (chip->pdata->enable_por_init && chip->pdata->config_data) {
|
|
ret = max17042_init_chip(chip);
|
|
if (ret)
|
|
return;
|
|
}
|
|
|
|
chip->init_complete = 1;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct max17042_platform_data *
|
|
max17042_get_of_pdata(struct max17042_chip *chip)
|
|
{
|
|
struct device *dev = &chip->client->dev;
|
|
struct device_node *np = dev->of_node;
|
|
u32 prop;
|
|
struct max17042_platform_data *pdata;
|
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return NULL;
|
|
|
|
/*
|
|
* Require current sense resistor value to be specified for
|
|
* current-sense functionality to be enabled at all.
|
|
*/
|
|
if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
|
|
pdata->r_sns = prop;
|
|
pdata->enable_current_sense = true;
|
|
}
|
|
|
|
if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
|
|
pdata->temp_min = INT_MIN;
|
|
if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
|
|
pdata->temp_max = INT_MAX;
|
|
if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
|
|
pdata->vmin = INT_MIN;
|
|
if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
|
|
pdata->vmax = INT_MAX;
|
|
|
|
return pdata;
|
|
}
|
|
#endif
|
|
|
|
static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
|
|
/*
|
|
* Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
|
|
* when the voltage FG reports 95%, as recommended in the datasheet.
|
|
*/
|
|
{ MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
|
|
};
|
|
|
|
static struct max17042_platform_data *
|
|
max17042_get_default_pdata(struct max17042_chip *chip)
|
|
{
|
|
struct device *dev = &chip->client->dev;
|
|
struct max17042_platform_data *pdata;
|
|
int ret, misc_cfg;
|
|
|
|
/*
|
|
* The MAX17047 gets used on x86 where we might not have pdata, assume
|
|
* the firmware will already have initialized the fuel-gauge and provide
|
|
* default values for the non init bits to make things work.
|
|
*/
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return pdata;
|
|
|
|
if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
|
|
pdata->init_data = max17047_default_pdata_init_regs;
|
|
pdata->num_init_data =
|
|
ARRAY_SIZE(max17047_default_pdata_init_regs);
|
|
}
|
|
|
|
ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
|
|
if (ret < 0)
|
|
return NULL;
|
|
|
|
/* If bits 0-1 are set to 3 then only Voltage readings are used */
|
|
if ((misc_cfg & 0x3) == 0x3)
|
|
pdata->enable_current_sense = false;
|
|
else
|
|
pdata->enable_current_sense = true;
|
|
|
|
pdata->vmin = MAX17042_DEFAULT_VMIN;
|
|
pdata->vmax = MAX17042_DEFAULT_VMAX;
|
|
pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
|
|
pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
|
|
|
|
return pdata;
|
|
}
|
|
|
|
static struct max17042_platform_data *
|
|
max17042_get_pdata(struct max17042_chip *chip)
|
|
{
|
|
struct device *dev = &chip->client->dev;
|
|
|
|
#ifdef CONFIG_OF
|
|
if (dev->of_node)
|
|
return max17042_get_of_pdata(chip);
|
|
#endif
|
|
if (dev->platform_data)
|
|
return dev->platform_data;
|
|
|
|
return max17042_get_default_pdata(chip);
|
|
}
|
|
|
|
static const struct regmap_config max17042_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 16,
|
|
.val_format_endian = REGMAP_ENDIAN_NATIVE,
|
|
};
|
|
|
|
static const struct power_supply_desc max17042_psy_desc = {
|
|
.name = "max170xx_battery",
|
|
.type = POWER_SUPPLY_TYPE_BATTERY,
|
|
.get_property = max17042_get_property,
|
|
.set_property = max17042_set_property,
|
|
.property_is_writeable = max17042_property_is_writeable,
|
|
.external_power_changed = max17042_external_power_changed,
|
|
.properties = max17042_battery_props,
|
|
.num_properties = ARRAY_SIZE(max17042_battery_props),
|
|
};
|
|
|
|
static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
|
|
.name = "max170xx_battery",
|
|
.type = POWER_SUPPLY_TYPE_BATTERY,
|
|
.get_property = max17042_get_property,
|
|
.set_property = max17042_set_property,
|
|
.property_is_writeable = max17042_property_is_writeable,
|
|
.properties = max17042_battery_props,
|
|
.num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
|
|
};
|
|
|
|
static int max17042_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
|
|
const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
|
|
struct power_supply_config psy_cfg = {};
|
|
const struct acpi_device_id *acpi_id = NULL;
|
|
struct device *dev = &client->dev;
|
|
struct max17042_chip *chip;
|
|
int ret;
|
|
int i;
|
|
u32 val;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
|
|
return -EIO;
|
|
|
|
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
chip->client = client;
|
|
if (id) {
|
|
chip->chip_type = id->driver_data;
|
|
} else {
|
|
acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
|
|
if (!acpi_id)
|
|
return -ENODEV;
|
|
|
|
chip->chip_type = acpi_id->driver_data;
|
|
}
|
|
chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
|
|
if (IS_ERR(chip->regmap)) {
|
|
dev_err(&client->dev, "Failed to initialize regmap\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
chip->pdata = max17042_get_pdata(chip);
|
|
if (!chip->pdata) {
|
|
dev_err(&client->dev, "no platform data provided\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
psy_cfg.drv_data = chip;
|
|
psy_cfg.of_node = dev->of_node;
|
|
|
|
/* When current is not measured,
|
|
* CURRENT_NOW and CURRENT_AVG properties should be invisible. */
|
|
if (!chip->pdata->enable_current_sense)
|
|
max17042_desc = &max17042_no_current_sense_psy_desc;
|
|
|
|
if (chip->pdata->r_sns == 0)
|
|
chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
|
|
|
|
if (chip->pdata->init_data)
|
|
for (i = 0; i < chip->pdata->num_init_data; i++)
|
|
regmap_write(chip->regmap,
|
|
chip->pdata->init_data[i].addr,
|
|
chip->pdata->init_data[i].data);
|
|
|
|
if (!chip->pdata->enable_current_sense) {
|
|
regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
|
|
regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
|
|
regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
|
|
}
|
|
|
|
chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
|
|
&psy_cfg);
|
|
if (IS_ERR(chip->battery)) {
|
|
dev_err(&client->dev, "failed: power supply register\n");
|
|
return PTR_ERR(chip->battery);
|
|
}
|
|
|
|
if (client->irq) {
|
|
unsigned int flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
|
|
|
|
/*
|
|
* On ACPI systems the IRQ may be handled by ACPI-event code,
|
|
* so we need to share (if the ACPI code is willing to share).
|
|
*/
|
|
if (acpi_id)
|
|
flags |= IRQF_SHARED | IRQF_PROBE_SHARED;
|
|
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL,
|
|
max17042_thread_handler, flags,
|
|
chip->battery->desc->name,
|
|
chip);
|
|
if (!ret) {
|
|
regmap_update_bits(chip->regmap, MAX17042_CONFIG,
|
|
CONFIG_ALRT_BIT_ENBL,
|
|
CONFIG_ALRT_BIT_ENBL);
|
|
max17042_set_soc_threshold(chip, 1);
|
|
} else {
|
|
client->irq = 0;
|
|
if (ret != -EBUSY)
|
|
dev_err(&client->dev, "Failed to get IRQ\n");
|
|
}
|
|
}
|
|
/* Not able to update the charge threshold when exceeded? -> disable */
|
|
if (!client->irq)
|
|
regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);
|
|
|
|
regmap_read(chip->regmap, MAX17042_STATUS, &val);
|
|
if (val & STATUS_POR_BIT) {
|
|
INIT_WORK(&chip->work, max17042_init_worker);
|
|
schedule_work(&chip->work);
|
|
} else {
|
|
chip->init_complete = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int max17042_suspend(struct device *dev)
|
|
{
|
|
struct max17042_chip *chip = dev_get_drvdata(dev);
|
|
|
|
/*
|
|
* disable the irq and enable irq_wake
|
|
* capability to the interrupt line.
|
|
*/
|
|
if (chip->client->irq) {
|
|
disable_irq(chip->client->irq);
|
|
enable_irq_wake(chip->client->irq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max17042_resume(struct device *dev)
|
|
{
|
|
struct max17042_chip *chip = dev_get_drvdata(dev);
|
|
|
|
if (chip->client->irq) {
|
|
disable_irq_wake(chip->client->irq);
|
|
enable_irq(chip->client->irq);
|
|
/* re-program the SOC thresholds to 1% change */
|
|
max17042_set_soc_threshold(chip, 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
|
|
max17042_resume);
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static const struct acpi_device_id max17042_acpi_match[] = {
|
|
{ "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
|
|
#endif
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id max17042_dt_match[] = {
|
|
{ .compatible = "maxim,max17042" },
|
|
{ .compatible = "maxim,max17047" },
|
|
{ .compatible = "maxim,max17050" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, max17042_dt_match);
|
|
#endif
|
|
|
|
static const struct i2c_device_id max17042_id[] = {
|
|
{ "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
|
|
{ "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
|
|
{ "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max17042_id);
|
|
|
|
static struct i2c_driver max17042_i2c_driver = {
|
|
.driver = {
|
|
.name = "max17042",
|
|
.acpi_match_table = ACPI_PTR(max17042_acpi_match),
|
|
.of_match_table = of_match_ptr(max17042_dt_match),
|
|
.pm = &max17042_pm_ops,
|
|
},
|
|
.probe = max17042_probe,
|
|
.id_table = max17042_id,
|
|
};
|
|
module_i2c_driver(max17042_i2c_driver);
|
|
|
|
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
|
|
MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
|
|
MODULE_LICENSE("GPL");
|