forked from Minki/linux
086ef502c2
This patch supports additional properties (PRESENT, CYCLE_COUNT, VOLTAGE_MAX, VOLTAGE_MIN_DESIGN, CURRENT_NOW, CURRENT_AVG, CHARGE_FULL, and TEMP). Plus, initialization code for registers is added. Signed-off-by: Donggeun Kim <dg77.kim@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: KyungMin Park <kyungmin.park@samsung.com> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
275 lines
7.4 KiB
C
275 lines
7.4 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/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.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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struct max17042_chip {
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struct i2c_client *client;
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struct power_supply battery;
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struct max17042_platform_data *pdata;
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};
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static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
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{
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int ret = i2c_smbus_write_word_data(client, reg, value);
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if (ret < 0)
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dev_err(&client->dev, "%s: err %d\n", __func__, ret);
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return ret;
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}
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static int max17042_read_reg(struct i2c_client *client, u8 reg)
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{
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int ret = i2c_smbus_read_word_data(client, reg);
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if (ret < 0)
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dev_err(&client->dev, "%s: err %d\n", __func__, ret);
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return ret;
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}
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static void max17042_set_reg(struct i2c_client *client,
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struct max17042_reg_data *data, int size)
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{
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int i;
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for (i = 0; i < size; i++)
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max17042_write_reg(client, data[i].addr, data[i].data);
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}
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static enum power_supply_property max17042_battery_props[] = {
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POWER_SUPPLY_PROP_PRESENT,
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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_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_CAPACITY,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_TEMP,
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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_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 = container_of(psy,
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struct max17042_chip, battery);
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switch (psp) {
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = max17042_read_reg(chip->client,
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MAX17042_STATUS);
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if (val->intval & 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_CYCLE_COUNT:
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val->intval = max17042_read_reg(chip->client,
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MAX17042_Cycles);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX:
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val->intval = max17042_read_reg(chip->client,
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MAX17042_MinMaxVolt);
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val->intval >>= 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_DESIGN:
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val->intval = max17042_read_reg(chip->client,
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MAX17042_V_empty);
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val->intval >>= 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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val->intval = max17042_read_reg(chip->client,
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MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_AVG:
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val->intval = max17042_read_reg(chip->client,
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MAX17042_AvgVCELL) * 83;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = max17042_read_reg(chip->client,
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MAX17042_SOC) / 256;
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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val->intval = max17042_read_reg(chip->client,
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MAX17042_RepSOC);
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if ((val->intval / 256) >= MAX17042_BATTERY_FULL)
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val->intval = 1;
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else if (val->intval >= 0)
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val->intval = 0;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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val->intval = max17042_read_reg(chip->client,
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MAX17042_TEMP);
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/* The value is signed. */
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if (val->intval & 0x8000) {
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val->intval = (0x7fff & ~val->intval) + 1;
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val->intval *= -1;
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}
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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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val->intval = val->intval * 10 / 256;
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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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val->intval = max17042_read_reg(chip->client,
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MAX17042_Current);
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if (val->intval & 0x8000) {
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/* Negative */
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val->intval = ~val->intval & 0x7fff;
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val->intval++;
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val->intval *= -1;
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}
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val->intval >>= 4;
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val->intval *= 1000000 * 25 / 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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val->intval = max17042_read_reg(chip->client,
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MAX17042_AvgCurrent);
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if (val->intval & 0x8000) {
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/* Negative */
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val->intval = ~val->intval & 0x7fff;
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val->intval++;
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val->intval *= -1;
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}
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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 __devinit max17042_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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struct max17042_chip *chip;
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int ret;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
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return -EIO;
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chip = kzalloc(sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->client = client;
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chip->pdata = client->dev.platform_data;
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i2c_set_clientdata(client, chip);
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chip->battery.name = "max17042_battery";
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chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
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chip->battery.get_property = max17042_get_property;
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chip->battery.properties = max17042_battery_props;
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chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
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/* When current is not measured,
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* CURRENT_NOW and CURRENT_AVG properties should be invisible. */
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if (!chip->pdata->enable_current_sense)
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chip->battery.num_properties -= 2;
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ret = power_supply_register(&client->dev, &chip->battery);
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if (ret) {
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dev_err(&client->dev, "failed: power supply register\n");
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kfree(chip);
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return ret;
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}
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/* Initialize registers according to values from the platform data */
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if (chip->pdata->init_data)
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max17042_set_reg(client, chip->pdata->init_data,
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chip->pdata->num_init_data);
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if (!chip->pdata->enable_current_sense) {
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max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
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max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
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max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
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} else {
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if (chip->pdata->r_sns == 0)
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chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
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}
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return 0;
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}
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static int __devexit max17042_remove(struct i2c_client *client)
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{
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struct max17042_chip *chip = i2c_get_clientdata(client);
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power_supply_unregister(&chip->battery);
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kfree(chip);
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return 0;
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}
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static const struct i2c_device_id max17042_id[] = {
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{ "max17042", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max17042_id);
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static struct i2c_driver max17042_i2c_driver = {
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.driver = {
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.name = "max17042",
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},
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.probe = max17042_probe,
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.remove = __devexit_p(max17042_remove),
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.id_table = max17042_id,
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};
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static int __init max17042_init(void)
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{
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return i2c_add_driver(&max17042_i2c_driver);
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}
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module_init(max17042_init);
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static void __exit max17042_exit(void)
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{
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i2c_del_driver(&max17042_i2c_driver);
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}
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module_exit(max17042_exit);
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MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
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MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
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MODULE_LICENSE("GPL");
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