935 lines
23 KiB
C
935 lines
23 KiB
C
/*
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* Gas Gauge driver for SBS Compliant Batteries
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*
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* Copyright (c) 2010, NVIDIA Corporation.
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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, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/power_supply.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of.h>
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#include <linux/stat.h>
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#include <linux/power/sbs-battery.h>
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enum {
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REG_MANUFACTURER_DATA,
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REG_TEMPERATURE,
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REG_VOLTAGE,
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REG_CURRENT,
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REG_CAPACITY,
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REG_TIME_TO_EMPTY,
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REG_TIME_TO_FULL,
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REG_STATUS,
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REG_CAPACITY_LEVEL,
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REG_CYCLE_COUNT,
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REG_SERIAL_NUMBER,
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REG_REMAINING_CAPACITY,
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REG_REMAINING_CAPACITY_CHARGE,
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REG_FULL_CHARGE_CAPACITY,
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REG_FULL_CHARGE_CAPACITY_CHARGE,
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REG_DESIGN_CAPACITY,
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REG_DESIGN_CAPACITY_CHARGE,
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REG_DESIGN_VOLTAGE_MIN,
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REG_DESIGN_VOLTAGE_MAX,
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REG_MANUFACTURER,
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REG_MODEL_NAME,
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};
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/* Battery Mode defines */
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#define BATTERY_MODE_OFFSET 0x03
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#define BATTERY_MODE_MASK 0x8000
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enum sbs_battery_mode {
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BATTERY_MODE_AMPS,
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BATTERY_MODE_WATTS
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};
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/* manufacturer access defines */
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#define MANUFACTURER_ACCESS_STATUS 0x0006
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#define MANUFACTURER_ACCESS_SLEEP 0x0011
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/* battery status value bits */
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#define BATTERY_INITIALIZED 0x80
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#define BATTERY_DISCHARGING 0x40
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#define BATTERY_FULL_CHARGED 0x20
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#define BATTERY_FULL_DISCHARGED 0x10
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/* min_value and max_value are only valid for numerical data */
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#define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
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.psp = _psp, \
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.addr = _addr, \
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.min_value = _min_value, \
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.max_value = _max_value, \
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}
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static const struct chip_data {
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enum power_supply_property psp;
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u8 addr;
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int min_value;
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int max_value;
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} sbs_data[] = {
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[REG_MANUFACTURER_DATA] =
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SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
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[REG_TEMPERATURE] =
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SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
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[REG_VOLTAGE] =
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SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
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[REG_CURRENT] =
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SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
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[REG_CAPACITY] =
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SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
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[REG_REMAINING_CAPACITY] =
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SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
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[REG_REMAINING_CAPACITY_CHARGE] =
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SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
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[REG_FULL_CHARGE_CAPACITY] =
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SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
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[REG_FULL_CHARGE_CAPACITY_CHARGE] =
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SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
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[REG_TIME_TO_EMPTY] =
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SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
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[REG_TIME_TO_FULL] =
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SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
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[REG_STATUS] =
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SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
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[REG_CAPACITY_LEVEL] =
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SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_LEVEL, 0x16, 0, 65535),
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[REG_CYCLE_COUNT] =
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SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
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[REG_DESIGN_CAPACITY] =
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SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
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[REG_DESIGN_CAPACITY_CHARGE] =
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SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
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[REG_DESIGN_VOLTAGE_MIN] =
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SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 0x19, 0, 65535),
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[REG_DESIGN_VOLTAGE_MAX] =
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SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
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[REG_SERIAL_NUMBER] =
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SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
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/* Properties of type `const char *' */
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[REG_MANUFACTURER] =
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SBS_DATA(POWER_SUPPLY_PROP_MANUFACTURER, 0x20, 0, 65535),
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[REG_MODEL_NAME] =
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SBS_DATA(POWER_SUPPLY_PROP_MODEL_NAME, 0x21, 0, 65535)
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};
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static enum power_supply_property sbs_properties[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_HEALTH,
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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_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
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POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
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POWER_SUPPLY_PROP_SERIAL_NUMBER,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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POWER_SUPPLY_PROP_ENERGY_NOW,
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POWER_SUPPLY_PROP_ENERGY_FULL,
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POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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/* Properties of type `const char *' */
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POWER_SUPPLY_PROP_MANUFACTURER,
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POWER_SUPPLY_PROP_MODEL_NAME
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};
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struct sbs_info {
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struct i2c_client *client;
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struct power_supply *power_supply;
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bool is_present;
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struct gpio_desc *gpio_detect;
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bool enable_detection;
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int last_state;
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int poll_time;
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u32 i2c_retry_count;
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u32 poll_retry_count;
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struct delayed_work work;
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int ignore_changes;
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};
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static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
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static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
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static bool force_load;
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static int sbs_read_word_data(struct i2c_client *client, u8 address)
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{
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struct sbs_info *chip = i2c_get_clientdata(client);
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s32 ret = 0;
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int retries = 1;
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retries = chip->i2c_retry_count;
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while (retries > 0) {
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ret = i2c_smbus_read_word_data(client, address);
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if (ret >= 0)
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break;
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retries--;
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}
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if (ret < 0) {
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dev_dbg(&client->dev,
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"%s: i2c read at address 0x%x failed\n",
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__func__, address);
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return ret;
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}
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return le16_to_cpu(ret);
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}
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static int sbs_read_string_data(struct i2c_client *client, u8 address,
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char *values)
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{
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struct sbs_info *chip = i2c_get_clientdata(client);
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s32 ret = 0, block_length = 0;
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int retries_length = 1, retries_block = 1;
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u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
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retries_length = chip->i2c_retry_count;
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retries_block = chip->i2c_retry_count;
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/* Adapter needs to support these two functions */
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_I2C_BLOCK)){
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return -ENODEV;
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}
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/* Get the length of block data */
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while (retries_length > 0) {
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ret = i2c_smbus_read_byte_data(client, address);
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if (ret >= 0)
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break;
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retries_length--;
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}
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if (ret < 0) {
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dev_dbg(&client->dev,
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"%s: i2c read at address 0x%x failed\n",
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__func__, address);
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return ret;
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}
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/* block_length does not include NULL terminator */
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block_length = ret;
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if (block_length > I2C_SMBUS_BLOCK_MAX) {
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dev_err(&client->dev,
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"%s: Returned block_length is longer than 0x%x\n",
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__func__, I2C_SMBUS_BLOCK_MAX);
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return -EINVAL;
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}
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/* Get the block data */
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while (retries_block > 0) {
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ret = i2c_smbus_read_i2c_block_data(
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client, address,
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block_length + 1, block_buffer);
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if (ret >= 0)
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break;
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retries_block--;
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}
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if (ret < 0) {
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dev_dbg(&client->dev,
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"%s: i2c read at address 0x%x failed\n",
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__func__, address);
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return ret;
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}
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/* block_buffer[0] == block_length */
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memcpy(values, block_buffer + 1, block_length);
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values[block_length] = '\0';
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return le16_to_cpu(ret);
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}
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static int sbs_write_word_data(struct i2c_client *client, u8 address,
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u16 value)
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{
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struct sbs_info *chip = i2c_get_clientdata(client);
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s32 ret = 0;
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int retries = 1;
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retries = chip->i2c_retry_count;
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while (retries > 0) {
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ret = i2c_smbus_write_word_data(client, address,
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le16_to_cpu(value));
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if (ret >= 0)
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break;
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retries--;
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}
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if (ret < 0) {
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dev_dbg(&client->dev,
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"%s: i2c write to address 0x%x failed\n",
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__func__, address);
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return ret;
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}
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return 0;
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}
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static int sbs_get_battery_presence_and_health(
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struct i2c_client *client, enum power_supply_property psp,
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union power_supply_propval *val)
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{
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s32 ret;
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struct sbs_info *chip = i2c_get_clientdata(client);
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if (psp == POWER_SUPPLY_PROP_PRESENT && chip->gpio_detect) {
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ret = gpiod_get_value_cansleep(chip->gpio_detect);
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if (ret < 0)
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return ret;
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val->intval = ret;
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chip->is_present = val->intval;
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return ret;
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}
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/*
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* Write to ManufacturerAccess with ManufacturerAccess command
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* and then read the status. Do not check for error on the write
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* since not all batteries implement write access to this command,
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* while others mandate it.
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*/
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sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
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MANUFACTURER_ACCESS_STATUS);
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ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
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if (ret < 0) {
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if (psp == POWER_SUPPLY_PROP_PRESENT)
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val->intval = 0; /* battery removed */
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return ret;
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}
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if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
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ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
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val->intval = 0;
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return 0;
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}
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/* Mask the upper nibble of 2nd byte and
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* lower byte of response then
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* shift the result by 8 to get status*/
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ret &= 0x0F00;
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ret >>= 8;
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if (psp == POWER_SUPPLY_PROP_PRESENT) {
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if (ret == 0x0F)
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/* battery removed */
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val->intval = 0;
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else
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val->intval = 1;
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} else if (psp == POWER_SUPPLY_PROP_HEALTH) {
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if (ret == 0x09)
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val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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else if (ret == 0x0B)
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val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
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else if (ret == 0x0C)
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
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else
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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}
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return 0;
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}
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static int sbs_get_battery_property(struct i2c_client *client,
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int reg_offset, enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct sbs_info *chip = i2c_get_clientdata(client);
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s32 ret;
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ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
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if (ret < 0)
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return ret;
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/* returned values are 16 bit */
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if (sbs_data[reg_offset].min_value < 0)
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ret = (s16)ret;
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if (ret >= sbs_data[reg_offset].min_value &&
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ret <= sbs_data[reg_offset].max_value) {
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val->intval = ret;
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if (psp == POWER_SUPPLY_PROP_CAPACITY_LEVEL) {
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if (!(ret & BATTERY_INITIALIZED))
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val->intval =
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POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
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else if (ret & BATTERY_FULL_CHARGED)
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val->intval =
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POWER_SUPPLY_CAPACITY_LEVEL_FULL;
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else if (ret & BATTERY_FULL_DISCHARGED)
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val->intval =
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POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
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else
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val->intval =
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POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
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return 0;
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} else if (psp != POWER_SUPPLY_PROP_STATUS) {
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return 0;
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}
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if (ret & BATTERY_FULL_CHARGED)
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val->intval = POWER_SUPPLY_STATUS_FULL;
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else if (ret & BATTERY_DISCHARGING)
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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else
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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if (chip->poll_time == 0)
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chip->last_state = val->intval;
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else if (chip->last_state != val->intval) {
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cancel_delayed_work_sync(&chip->work);
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power_supply_changed(chip->power_supply);
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chip->poll_time = 0;
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}
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} else {
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if (psp == POWER_SUPPLY_PROP_STATUS)
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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else
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val->intval = 0;
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}
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return 0;
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}
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static int sbs_get_battery_string_property(struct i2c_client *client,
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int reg_offset, enum power_supply_property psp, char *val)
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{
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s32 ret;
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ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
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if (ret < 0)
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return ret;
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return 0;
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}
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static void sbs_unit_adjustment(struct i2c_client *client,
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enum power_supply_property psp, union power_supply_propval *val)
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{
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#define BASE_UNIT_CONVERSION 1000
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#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
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#define TIME_UNIT_CONVERSION 60
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#define TEMP_KELVIN_TO_CELSIUS 2731
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switch (psp) {
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case POWER_SUPPLY_PROP_ENERGY_NOW:
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case POWER_SUPPLY_PROP_ENERGY_FULL:
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case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
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/* sbs provides energy in units of 10mWh.
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* Convert to µWh
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*/
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val->intval *= BATTERY_MODE_CAP_MULT_WATT;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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val->intval *= BASE_UNIT_CONVERSION;
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break;
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|
case POWER_SUPPLY_PROP_TEMP:
|
|
/* sbs provides battery temperature in 0.1K
|
|
* so convert it to 0.1°C
|
|
*/
|
|
val->intval -= TEMP_KELVIN_TO_CELSIUS;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
|
|
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
|
|
/* sbs provides time to empty and time to full in minutes.
|
|
* Convert to seconds
|
|
*/
|
|
val->intval *= TIME_UNIT_CONVERSION;
|
|
break;
|
|
|
|
default:
|
|
dev_dbg(&client->dev,
|
|
"%s: no need for unit conversion %d\n", __func__, psp);
|
|
}
|
|
}
|
|
|
|
static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client,
|
|
enum sbs_battery_mode mode)
|
|
{
|
|
int ret, original_val;
|
|
|
|
original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
|
|
if (original_val < 0)
|
|
return original_val;
|
|
|
|
if ((original_val & BATTERY_MODE_MASK) == mode)
|
|
return mode;
|
|
|
|
if (mode == BATTERY_MODE_AMPS)
|
|
ret = original_val & ~BATTERY_MODE_MASK;
|
|
else
|
|
ret = original_val | BATTERY_MODE_MASK;
|
|
|
|
ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return original_val & BATTERY_MODE_MASK;
|
|
}
|
|
|
|
static int sbs_get_battery_capacity(struct i2c_client *client,
|
|
int reg_offset, enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
s32 ret;
|
|
enum sbs_battery_mode mode = BATTERY_MODE_WATTS;
|
|
|
|
if (power_supply_is_amp_property(psp))
|
|
mode = BATTERY_MODE_AMPS;
|
|
|
|
mode = sbs_set_battery_mode(client, mode);
|
|
if (mode < 0)
|
|
return mode;
|
|
|
|
ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (psp == POWER_SUPPLY_PROP_CAPACITY) {
|
|
/* sbs spec says that this can be >100 %
|
|
* even if max value is 100 % */
|
|
val->intval = min(ret, 100);
|
|
} else
|
|
val->intval = ret;
|
|
|
|
ret = sbs_set_battery_mode(client, mode);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char sbs_serial[5];
|
|
static int sbs_get_battery_serial_number(struct i2c_client *client,
|
|
union power_supply_propval *val)
|
|
{
|
|
int ret;
|
|
|
|
ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = sprintf(sbs_serial, "%04x", ret);
|
|
val->strval = sbs_serial;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbs_get_property_index(struct i2c_client *client,
|
|
enum power_supply_property psp)
|
|
{
|
|
int count;
|
|
for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
|
|
if (psp == sbs_data[count].psp)
|
|
return count;
|
|
|
|
dev_warn(&client->dev,
|
|
"%s: Invalid Property - %d\n", __func__, psp);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int sbs_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
int ret = 0;
|
|
struct sbs_info *chip = power_supply_get_drvdata(psy);
|
|
struct i2c_client *client = chip->client;
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
case POWER_SUPPLY_PROP_HEALTH:
|
|
ret = sbs_get_battery_presence_and_health(client, psp, val);
|
|
if (psp == POWER_SUPPLY_PROP_PRESENT)
|
|
return 0;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
|
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
|
|
goto done; /* don't trigger power_supply_changed()! */
|
|
|
|
case POWER_SUPPLY_PROP_ENERGY_NOW:
|
|
case POWER_SUPPLY_PROP_ENERGY_FULL:
|
|
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
|
|
case POWER_SUPPLY_PROP_CHARGE_NOW:
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
|
case POWER_SUPPLY_PROP_CAPACITY:
|
|
ret = sbs_get_property_index(client, psp);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = sbs_get_battery_capacity(client, ret, psp, val);
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_SERIAL_NUMBER:
|
|
ret = sbs_get_battery_serial_number(client, val);
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
|
|
case POWER_SUPPLY_PROP_CYCLE_COUNT:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
|
case POWER_SUPPLY_PROP_TEMP:
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
|
|
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
|
|
ret = sbs_get_property_index(client, psp);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = sbs_get_battery_property(client, ret, psp, val);
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_MODEL_NAME:
|
|
ret = sbs_get_property_index(client, psp);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = sbs_get_battery_string_property(client, ret, psp,
|
|
model_name);
|
|
val->strval = model_name;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_MANUFACTURER:
|
|
ret = sbs_get_property_index(client, psp);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = sbs_get_battery_string_property(client, ret, psp,
|
|
manufacturer);
|
|
val->strval = manufacturer;
|
|
break;
|
|
|
|
default:
|
|
dev_err(&client->dev,
|
|
"%s: INVALID property\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!chip->enable_detection)
|
|
goto done;
|
|
|
|
if (!chip->gpio_detect &&
|
|
chip->is_present != (ret >= 0)) {
|
|
chip->is_present = (ret >= 0);
|
|
power_supply_changed(chip->power_supply);
|
|
}
|
|
|
|
done:
|
|
if (!ret) {
|
|
/* Convert units to match requirements for power supply class */
|
|
sbs_unit_adjustment(client, psp, val);
|
|
}
|
|
|
|
dev_dbg(&client->dev,
|
|
"%s: property = %d, value = %x\n", __func__, psp, val->intval);
|
|
|
|
if (ret && chip->is_present)
|
|
return ret;
|
|
|
|
/* battery not present, so return NODATA for properties */
|
|
if (ret)
|
|
return -ENODATA;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t sbs_irq(int irq, void *devid)
|
|
{
|
|
struct sbs_info *chip = devid;
|
|
struct power_supply *battery = chip->power_supply;
|
|
int ret;
|
|
|
|
ret = gpiod_get_value_cansleep(chip->gpio_detect);
|
|
if (ret < 0)
|
|
return ret;
|
|
chip->is_present = ret;
|
|
power_supply_changed(battery);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void sbs_external_power_changed(struct power_supply *psy)
|
|
{
|
|
struct sbs_info *chip = power_supply_get_drvdata(psy);
|
|
|
|
if (chip->ignore_changes > 0) {
|
|
chip->ignore_changes--;
|
|
return;
|
|
}
|
|
|
|
/* cancel outstanding work */
|
|
cancel_delayed_work_sync(&chip->work);
|
|
|
|
schedule_delayed_work(&chip->work, HZ);
|
|
chip->poll_time = chip->poll_retry_count;
|
|
}
|
|
|
|
static void sbs_delayed_work(struct work_struct *work)
|
|
{
|
|
struct sbs_info *chip;
|
|
s32 ret;
|
|
|
|
chip = container_of(work, struct sbs_info, work.work);
|
|
|
|
ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
|
|
/* if the read failed, give up on this work */
|
|
if (ret < 0) {
|
|
chip->poll_time = 0;
|
|
return;
|
|
}
|
|
|
|
if (ret & BATTERY_FULL_CHARGED)
|
|
ret = POWER_SUPPLY_STATUS_FULL;
|
|
else if (ret & BATTERY_DISCHARGING)
|
|
ret = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
else
|
|
ret = POWER_SUPPLY_STATUS_CHARGING;
|
|
|
|
if (chip->last_state != ret) {
|
|
chip->poll_time = 0;
|
|
power_supply_changed(chip->power_supply);
|
|
return;
|
|
}
|
|
if (chip->poll_time > 0) {
|
|
schedule_delayed_work(&chip->work, HZ);
|
|
chip->poll_time--;
|
|
return;
|
|
}
|
|
}
|
|
|
|
static const struct power_supply_desc sbs_default_desc = {
|
|
.type = POWER_SUPPLY_TYPE_BATTERY,
|
|
.properties = sbs_properties,
|
|
.num_properties = ARRAY_SIZE(sbs_properties),
|
|
.get_property = sbs_get_property,
|
|
.external_power_changed = sbs_external_power_changed,
|
|
};
|
|
|
|
static int sbs_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct sbs_info *chip;
|
|
struct power_supply_desc *sbs_desc;
|
|
struct sbs_platform_data *pdata = client->dev.platform_data;
|
|
struct power_supply_config psy_cfg = {};
|
|
int rc;
|
|
int irq;
|
|
|
|
sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc,
|
|
sizeof(*sbs_desc), GFP_KERNEL);
|
|
if (!sbs_desc)
|
|
return -ENOMEM;
|
|
|
|
sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s",
|
|
dev_name(&client->dev));
|
|
if (!sbs_desc->name)
|
|
return -ENOMEM;
|
|
|
|
chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
chip->client = client;
|
|
chip->enable_detection = false;
|
|
psy_cfg.of_node = client->dev.of_node;
|
|
psy_cfg.drv_data = chip;
|
|
/* ignore first notification of external change, it is generated
|
|
* from the power_supply_register call back
|
|
*/
|
|
chip->ignore_changes = 1;
|
|
chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
|
|
/* use pdata if available, fall back to DT properties,
|
|
* or hardcoded defaults if not
|
|
*/
|
|
rc = of_property_read_u32(client->dev.of_node, "sbs,i2c-retry-count",
|
|
&chip->i2c_retry_count);
|
|
if (rc)
|
|
chip->i2c_retry_count = 0;
|
|
|
|
rc = of_property_read_u32(client->dev.of_node, "sbs,poll-retry-count",
|
|
&chip->poll_retry_count);
|
|
if (rc)
|
|
chip->poll_retry_count = 0;
|
|
|
|
if (pdata) {
|
|
chip->poll_retry_count = pdata->poll_retry_count;
|
|
chip->i2c_retry_count = pdata->i2c_retry_count;
|
|
}
|
|
chip->i2c_retry_count = chip->i2c_retry_count + 1;
|
|
|
|
chip->gpio_detect = devm_gpiod_get_optional(&client->dev,
|
|
"sbs,battery-detect", GPIOD_IN);
|
|
if (IS_ERR(chip->gpio_detect)) {
|
|
dev_err(&client->dev, "Failed to get gpio: %ld\n",
|
|
PTR_ERR(chip->gpio_detect));
|
|
return PTR_ERR(chip->gpio_detect);
|
|
}
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
|
|
if (!chip->gpio_detect)
|
|
goto skip_gpio;
|
|
|
|
irq = gpiod_to_irq(chip->gpio_detect);
|
|
if (irq <= 0) {
|
|
dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
|
|
goto skip_gpio;
|
|
}
|
|
|
|
rc = devm_request_threaded_irq(&client->dev, irq, NULL, sbs_irq,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
dev_name(&client->dev), chip);
|
|
if (rc) {
|
|
dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
|
|
goto skip_gpio;
|
|
}
|
|
|
|
skip_gpio:
|
|
/*
|
|
* Before we register, we might need to make sure we can actually talk
|
|
* to the battery.
|
|
*/
|
|
if (!(force_load || chip->gpio_detect)) {
|
|
rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
|
|
|
|
if (rc < 0) {
|
|
dev_err(&client->dev, "%s: Failed to get device status\n",
|
|
__func__);
|
|
goto exit_psupply;
|
|
}
|
|
}
|
|
|
|
chip->power_supply = devm_power_supply_register(&client->dev, sbs_desc,
|
|
&psy_cfg);
|
|
if (IS_ERR(chip->power_supply)) {
|
|
dev_err(&client->dev,
|
|
"%s: Failed to register power supply\n", __func__);
|
|
rc = PTR_ERR(chip->power_supply);
|
|
goto exit_psupply;
|
|
}
|
|
|
|
dev_info(&client->dev,
|
|
"%s: battery gas gauge device registered\n", client->name);
|
|
|
|
INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
|
|
|
|
chip->enable_detection = true;
|
|
|
|
return 0;
|
|
|
|
exit_psupply:
|
|
return rc;
|
|
}
|
|
|
|
static int sbs_remove(struct i2c_client *client)
|
|
{
|
|
struct sbs_info *chip = i2c_get_clientdata(client);
|
|
|
|
cancel_delayed_work_sync(&chip->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined CONFIG_PM_SLEEP
|
|
|
|
static int sbs_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct sbs_info *chip = i2c_get_clientdata(client);
|
|
|
|
if (chip->poll_time > 0)
|
|
cancel_delayed_work_sync(&chip->work);
|
|
|
|
/*
|
|
* Write to manufacturer access with sleep command.
|
|
* Support is manufacturer dependend, so ignore errors.
|
|
*/
|
|
sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
|
|
MANUFACTURER_ACCESS_SLEEP);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
|
|
#define SBS_PM_OPS (&sbs_pm_ops)
|
|
|
|
#else
|
|
#define SBS_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct i2c_device_id sbs_id[] = {
|
|
{ "bq20z75", 0 },
|
|
{ "sbs-battery", 1 },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, sbs_id);
|
|
|
|
static const struct of_device_id sbs_dt_ids[] = {
|
|
{ .compatible = "sbs,sbs-battery" },
|
|
{ .compatible = "ti,bq20z75" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sbs_dt_ids);
|
|
|
|
static struct i2c_driver sbs_battery_driver = {
|
|
.probe = sbs_probe,
|
|
.remove = sbs_remove,
|
|
.id_table = sbs_id,
|
|
.driver = {
|
|
.name = "sbs-battery",
|
|
.of_match_table = sbs_dt_ids,
|
|
.pm = SBS_PM_OPS,
|
|
},
|
|
};
|
|
module_i2c_driver(sbs_battery_driver);
|
|
|
|
MODULE_DESCRIPTION("SBS battery monitor driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(force_load, bool, S_IRUSR | S_IRGRP | S_IROTH);
|
|
MODULE_PARM_DESC(force_load,
|
|
"Attempt to load the driver even if no battery is connected");
|