forked from Minki/linux
ee177d96e0
Need to enable detection, which is also blocking the unit conversion logic after registering the power_supply. Signed-off-by: Rhyland Klein <rklein@nvidia.com> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
795 lines
20 KiB
C
795 lines
20 KiB
C
/*
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* Gas Gauge driver for TI's BQ20Z75
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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.h>
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#include <linux/power/bq20z75.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_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,
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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 bq20z75_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_DISCHARGING 0x40
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#define BATTERY_FULL_CHARGED 0x20
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#define BATTERY_FULL_DISCHARGED 0x10
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#define BQ20Z75_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 bq20z75_device_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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} bq20z75_data[] = {
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[REG_MANUFACTURER_DATA] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
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[REG_TEMPERATURE] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
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[REG_VOLTAGE] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
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[REG_CURRENT] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768,
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32767),
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[REG_CAPACITY] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0E, 0, 100),
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[REG_REMAINING_CAPACITY] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
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[REG_REMAINING_CAPACITY_CHARGE] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
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[REG_FULL_CHARGE_CAPACITY] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
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[REG_FULL_CHARGE_CAPACITY_CHARGE] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
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[REG_TIME_TO_EMPTY] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0,
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65535),
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[REG_TIME_TO_FULL] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0,
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65535),
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[REG_STATUS] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
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[REG_CYCLE_COUNT] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
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[REG_DESIGN_CAPACITY] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0,
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65535),
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[REG_DESIGN_CAPACITY_CHARGE] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0,
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65535),
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[REG_DESIGN_VOLTAGE] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0,
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65535),
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[REG_SERIAL_NUMBER] =
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BQ20Z75_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
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};
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static enum power_supply_property bq20z75_properties[] = {
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POWER_SUPPLY_PROP_STATUS,
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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_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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};
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struct bq20z75_info {
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struct i2c_client *client;
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struct power_supply power_supply;
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struct bq20z75_platform_data *pdata;
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bool is_present;
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bool gpio_detect;
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bool enable_detection;
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int irq;
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int last_state;
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int poll_time;
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struct delayed_work work;
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int ignore_changes;
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};
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static int bq20z75_read_word_data(struct i2c_client *client, u8 address)
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{
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struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
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s32 ret = 0;
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int retries = 1;
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if (bq20z75_device->pdata)
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retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
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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 bq20z75_write_word_data(struct i2c_client *client, u8 address,
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u16 value)
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{
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struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
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s32 ret = 0;
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int retries = 1;
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if (bq20z75_device->pdata)
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retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
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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 bq20z75_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 bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
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if (psp == POWER_SUPPLY_PROP_PRESENT &&
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bq20z75_device->gpio_detect) {
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ret = gpio_get_value(
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bq20z75_device->pdata->battery_detect);
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if (ret == bq20z75_device->pdata->battery_detect_present)
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val->intval = 1;
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else
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val->intval = 0;
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bq20z75_device->is_present = val->intval;
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return ret;
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}
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/* Write to ManufacturerAccess with
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* ManufacturerAccess command and then
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* read the status */
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ret = bq20z75_write_word_data(client,
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bq20z75_data[REG_MANUFACTURER_DATA].addr,
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MANUFACTURER_ACCESS_STATUS);
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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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ret = bq20z75_read_word_data(client,
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bq20z75_data[REG_MANUFACTURER_DATA].addr);
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if (ret < 0)
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return ret;
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if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value ||
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ret > bq20z75_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 bq20z75_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 bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
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s32 ret;
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ret = bq20z75_read_word_data(client,
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bq20z75_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 (bq20z75_data[reg_offset].min_value < 0)
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ret = (s16)ret;
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if (ret >= bq20z75_data[reg_offset].min_value &&
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ret <= bq20z75_data[reg_offset].max_value) {
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val->intval = ret;
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if (psp != POWER_SUPPLY_PROP_STATUS)
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return 0;
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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_FULL_DISCHARGED)
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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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 (bq20z75_device->poll_time == 0)
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bq20z75_device->last_state = val->intval;
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else if (bq20z75_device->last_state != val->intval) {
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cancel_delayed_work_sync(&bq20z75_device->work);
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power_supply_changed(&bq20z75_device->power_supply);
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bq20z75_device->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 void bq20z75_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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/* bq20z75 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_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:
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/* bq20z75 provides battery temperature in 0.1K
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* so convert it to 0.1°C
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*/
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val->intval -= TEMP_KELVIN_TO_CELSIUS;
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break;
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case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
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case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
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/* bq20z75 provides time to empty and time to full in minutes.
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* Convert to seconds
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*/
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val->intval *= TIME_UNIT_CONVERSION;
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break;
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default:
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dev_dbg(&client->dev,
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"%s: no need for unit conversion %d\n", __func__, psp);
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}
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}
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static enum bq20z75_battery_mode
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bq20z75_set_battery_mode(struct i2c_client *client,
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enum bq20z75_battery_mode mode)
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{
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int ret, original_val;
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original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET);
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if (original_val < 0)
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return original_val;
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if ((original_val & BATTERY_MODE_MASK) == mode)
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return mode;
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if (mode == BATTERY_MODE_AMPS)
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ret = original_val & ~BATTERY_MODE_MASK;
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else
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ret = original_val | BATTERY_MODE_MASK;
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ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret);
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if (ret < 0)
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return ret;
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return original_val & BATTERY_MODE_MASK;
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}
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static int bq20z75_get_battery_capacity(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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s32 ret;
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enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS;
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if (power_supply_is_amp_property(psp))
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mode = BATTERY_MODE_AMPS;
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mode = bq20z75_set_battery_mode(client, mode);
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if (mode < 0)
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return mode;
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ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr);
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if (ret < 0)
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return ret;
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if (psp == POWER_SUPPLY_PROP_CAPACITY) {
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/* bq20z75 spec says that this can be >100 %
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* even if max value is 100 % */
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val->intval = min(ret, 100);
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} else
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val->intval = ret;
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ret = bq20z75_set_battery_mode(client, mode);
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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 char bq20z75_serial[5];
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static int bq20z75_get_battery_serial_number(struct i2c_client *client,
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union power_supply_propval *val)
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{
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int ret;
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ret = bq20z75_read_word_data(client,
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bq20z75_data[REG_SERIAL_NUMBER].addr);
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if (ret < 0)
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return ret;
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ret = sprintf(bq20z75_serial, "%04x", ret);
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val->strval = bq20z75_serial;
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return 0;
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}
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static int bq20z75_get_property_index(struct i2c_client *client,
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enum power_supply_property psp)
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{
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int count;
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for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++)
|
|
if (psp == bq20z75_data[count].psp)
|
|
return count;
|
|
|
|
dev_warn(&client->dev,
|
|
"%s: Invalid Property - %d\n", __func__, psp);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int bq20z75_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
int ret = 0;
|
|
struct bq20z75_info *bq20z75_device = container_of(psy,
|
|
struct bq20z75_info, power_supply);
|
|
struct i2c_client *client = bq20z75_device->client;
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
case POWER_SUPPLY_PROP_HEALTH:
|
|
ret = bq20z75_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;
|
|
break;
|
|
|
|
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 = bq20z75_get_property_index(client, psp);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = bq20z75_get_battery_capacity(client, ret, psp, val);
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_SERIAL_NUMBER:
|
|
ret = bq20z75_get_battery_serial_number(client, val);
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
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_MAX_DESIGN:
|
|
ret = bq20z75_get_property_index(client, psp);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = bq20z75_get_battery_property(client, ret, psp, val);
|
|
break;
|
|
|
|
default:
|
|
dev_err(&client->dev,
|
|
"%s: INVALID property\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!bq20z75_device->enable_detection)
|
|
goto done;
|
|
|
|
if (!bq20z75_device->gpio_detect &&
|
|
bq20z75_device->is_present != (ret >= 0)) {
|
|
bq20z75_device->is_present = (ret >= 0);
|
|
power_supply_changed(&bq20z75_device->power_supply);
|
|
}
|
|
|
|
done:
|
|
if (!ret) {
|
|
/* Convert units to match requirements for power supply class */
|
|
bq20z75_unit_adjustment(client, psp, val);
|
|
}
|
|
|
|
dev_dbg(&client->dev,
|
|
"%s: property = %d, value = %x\n", __func__, psp, val->intval);
|
|
|
|
if (ret && bq20z75_device->is_present)
|
|
return ret;
|
|
|
|
/* battery not present, so return NODATA for properties */
|
|
if (ret)
|
|
return -ENODATA;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t bq20z75_irq(int irq, void *devid)
|
|
{
|
|
struct power_supply *battery = devid;
|
|
|
|
power_supply_changed(battery);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void bq20z75_external_power_changed(struct power_supply *psy)
|
|
{
|
|
struct bq20z75_info *bq20z75_device;
|
|
|
|
bq20z75_device = container_of(psy, struct bq20z75_info, power_supply);
|
|
|
|
if (bq20z75_device->ignore_changes > 0) {
|
|
bq20z75_device->ignore_changes--;
|
|
return;
|
|
}
|
|
|
|
/* cancel outstanding work */
|
|
cancel_delayed_work_sync(&bq20z75_device->work);
|
|
|
|
schedule_delayed_work(&bq20z75_device->work, HZ);
|
|
bq20z75_device->poll_time = bq20z75_device->pdata->poll_retry_count;
|
|
}
|
|
|
|
static void bq20z75_delayed_work(struct work_struct *work)
|
|
{
|
|
struct bq20z75_info *bq20z75_device;
|
|
s32 ret;
|
|
|
|
bq20z75_device = container_of(work, struct bq20z75_info, work.work);
|
|
|
|
ret = bq20z75_read_word_data(bq20z75_device->client,
|
|
bq20z75_data[REG_STATUS].addr);
|
|
/* if the read failed, give up on this work */
|
|
if (ret < 0) {
|
|
bq20z75_device->poll_time = 0;
|
|
return;
|
|
}
|
|
|
|
if (ret & BATTERY_FULL_CHARGED)
|
|
ret = POWER_SUPPLY_STATUS_FULL;
|
|
else if (ret & BATTERY_FULL_DISCHARGED)
|
|
ret = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
|
else if (ret & BATTERY_DISCHARGING)
|
|
ret = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
else
|
|
ret = POWER_SUPPLY_STATUS_CHARGING;
|
|
|
|
if (bq20z75_device->last_state != ret) {
|
|
bq20z75_device->poll_time = 0;
|
|
power_supply_changed(&bq20z75_device->power_supply);
|
|
return;
|
|
}
|
|
if (bq20z75_device->poll_time > 0) {
|
|
schedule_delayed_work(&bq20z75_device->work, HZ);
|
|
bq20z75_device->poll_time--;
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int __devinit bq20z75_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct bq20z75_info *bq20z75_device;
|
|
struct bq20z75_platform_data *pdata = client->dev.platform_data;
|
|
int rc;
|
|
int irq;
|
|
|
|
bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL);
|
|
if (!bq20z75_device)
|
|
return -ENOMEM;
|
|
|
|
bq20z75_device->client = client;
|
|
bq20z75_device->enable_detection = false;
|
|
bq20z75_device->gpio_detect = false;
|
|
bq20z75_device->power_supply.name = "battery";
|
|
bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
|
|
bq20z75_device->power_supply.properties = bq20z75_properties;
|
|
bq20z75_device->power_supply.num_properties =
|
|
ARRAY_SIZE(bq20z75_properties);
|
|
bq20z75_device->power_supply.get_property = bq20z75_get_property;
|
|
/* ignore first notification of external change, it is generated
|
|
* from the power_supply_register call back
|
|
*/
|
|
bq20z75_device->ignore_changes = 1;
|
|
bq20z75_device->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
bq20z75_device->power_supply.external_power_changed =
|
|
bq20z75_external_power_changed;
|
|
|
|
if (pdata) {
|
|
bq20z75_device->gpio_detect =
|
|
gpio_is_valid(pdata->battery_detect);
|
|
bq20z75_device->pdata = pdata;
|
|
}
|
|
|
|
i2c_set_clientdata(client, bq20z75_device);
|
|
|
|
if (!bq20z75_device->gpio_detect)
|
|
goto skip_gpio;
|
|
|
|
rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
|
|
if (rc) {
|
|
dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
|
|
bq20z75_device->gpio_detect = false;
|
|
goto skip_gpio;
|
|
}
|
|
|
|
rc = gpio_direction_input(pdata->battery_detect);
|
|
if (rc) {
|
|
dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
|
|
gpio_free(pdata->battery_detect);
|
|
bq20z75_device->gpio_detect = false;
|
|
goto skip_gpio;
|
|
}
|
|
|
|
irq = gpio_to_irq(pdata->battery_detect);
|
|
if (irq <= 0) {
|
|
dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
|
|
gpio_free(pdata->battery_detect);
|
|
bq20z75_device->gpio_detect = false;
|
|
goto skip_gpio;
|
|
}
|
|
|
|
rc = request_irq(irq, bq20z75_irq,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
dev_name(&client->dev), &bq20z75_device->power_supply);
|
|
if (rc) {
|
|
dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
|
|
gpio_free(pdata->battery_detect);
|
|
bq20z75_device->gpio_detect = false;
|
|
goto skip_gpio;
|
|
}
|
|
|
|
bq20z75_device->irq = irq;
|
|
|
|
skip_gpio:
|
|
|
|
rc = power_supply_register(&client->dev, &bq20z75_device->power_supply);
|
|
if (rc) {
|
|
dev_err(&client->dev,
|
|
"%s: Failed to register power supply\n", __func__);
|
|
goto exit_psupply;
|
|
}
|
|
|
|
dev_info(&client->dev,
|
|
"%s: battery gas gauge device registered\n", client->name);
|
|
|
|
INIT_DELAYED_WORK(&bq20z75_device->work, bq20z75_delayed_work);
|
|
|
|
bq20z75_device->enable_detection = true;
|
|
|
|
return 0;
|
|
|
|
exit_psupply:
|
|
if (bq20z75_device->irq)
|
|
free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
|
|
if (bq20z75_device->gpio_detect)
|
|
gpio_free(pdata->battery_detect);
|
|
|
|
kfree(bq20z75_device);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int __devexit bq20z75_remove(struct i2c_client *client)
|
|
{
|
|
struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
|
|
|
|
if (bq20z75_device->irq)
|
|
free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
|
|
if (bq20z75_device->gpio_detect)
|
|
gpio_free(bq20z75_device->pdata->battery_detect);
|
|
|
|
power_supply_unregister(&bq20z75_device->power_supply);
|
|
|
|
cancel_delayed_work_sync(&bq20z75_device->work);
|
|
|
|
kfree(bq20z75_device);
|
|
bq20z75_device = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined CONFIG_PM
|
|
static int bq20z75_suspend(struct i2c_client *client,
|
|
pm_message_t state)
|
|
{
|
|
struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
|
|
s32 ret;
|
|
|
|
if (bq20z75_device->poll_time > 0)
|
|
cancel_delayed_work_sync(&bq20z75_device->work);
|
|
|
|
/* write to manufacturer access with sleep command */
|
|
ret = bq20z75_write_word_data(client,
|
|
bq20z75_data[REG_MANUFACTURER_DATA].addr,
|
|
MANUFACTURER_ACCESS_SLEEP);
|
|
if (bq20z75_device->is_present && ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define bq20z75_suspend NULL
|
|
#endif
|
|
/* any smbus transaction will wake up bq20z75 */
|
|
#define bq20z75_resume NULL
|
|
|
|
static const struct i2c_device_id bq20z75_id[] = {
|
|
{ "bq20z75", 0 },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, bq20z75_id);
|
|
|
|
static struct i2c_driver bq20z75_battery_driver = {
|
|
.probe = bq20z75_probe,
|
|
.remove = __devexit_p(bq20z75_remove),
|
|
.suspend = bq20z75_suspend,
|
|
.resume = bq20z75_resume,
|
|
.id_table = bq20z75_id,
|
|
.driver = {
|
|
.name = "bq20z75-battery",
|
|
},
|
|
};
|
|
|
|
static int __init bq20z75_battery_init(void)
|
|
{
|
|
return i2c_add_driver(&bq20z75_battery_driver);
|
|
}
|
|
module_init(bq20z75_battery_init);
|
|
|
|
static void __exit bq20z75_battery_exit(void)
|
|
{
|
|
i2c_del_driver(&bq20z75_battery_driver);
|
|
}
|
|
module_exit(bq20z75_battery_exit);
|
|
|
|
MODULE_DESCRIPTION("BQ20z75 battery monitor driver");
|
|
MODULE_LICENSE("GPL");
|