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linux/drivers/power/bq20z75.c
Rhyland Klein a7d9ace4eb bq20z75: Fix issues with present and suspend 
There are a few issues found around the battery not being present. If the
battery isn't present, then a few undesirable things happen. The first was
excessive reporting of failed properties. This was fixed by instead
returning ENODATA for all properties other than PRESENT if the battery
isn't present. That way the callers can identify the difference between a
failure and the battery not being there.

The next issue was in the suspend logic. It was found that if the battery
wasn't present, then it would return a failure, preventing the system from
going into suspend. If there is no battery present, the io is expected to
fail, so in that case, we shouldn't return the failure and just
acknowledge that it was expected.

I also found that when a gpio was used, i didn't maintain the internal
is_present state properly. I added a set of that to fix that.

Lastly, the code to see io's fail and figure out that the battery isn't
present when not using a gpio had a problem. In that code, it looked for
the read to fail and if it did, then handled it. The problem is that in
function to get the property, it first writes a value and that write can
fail, causing the code to never reach the logic after the read. Fix is
to move the logic till after the write.

Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
2011-03-16 16:40:58 +03:00

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/*
* Gas Gauge driver for TI's BQ20Z75
*
* Copyright (c) 2010, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/power/bq20z75.h>
enum {
REG_MANUFACTURER_DATA,
REG_TEMPERATURE,
REG_VOLTAGE,
REG_CURRENT,
REG_CAPACITY,
REG_TIME_TO_EMPTY,
REG_TIME_TO_FULL,
REG_STATUS,
REG_CYCLE_COUNT,
REG_SERIAL_NUMBER,
REG_REMAINING_CAPACITY,
REG_REMAINING_CAPACITY_CHARGE,
REG_FULL_CHARGE_CAPACITY,
REG_FULL_CHARGE_CAPACITY_CHARGE,
REG_DESIGN_CAPACITY,
REG_DESIGN_CAPACITY_CHARGE,
REG_DESIGN_VOLTAGE,
};
/* Battery Mode defines */
#define BATTERY_MODE_OFFSET 0x03
#define BATTERY_MODE_MASK 0x8000
enum bq20z75_battery_mode {
BATTERY_MODE_AMPS,
BATTERY_MODE_WATTS
};
/* manufacturer access defines */
#define MANUFACTURER_ACCESS_STATUS 0x0006
#define MANUFACTURER_ACCESS_SLEEP 0x0011
/* battery status value bits */
#define BATTERY_DISCHARGING 0x40
#define BATTERY_FULL_CHARGED 0x20
#define BATTERY_FULL_DISCHARGED 0x10
#define BQ20Z75_DATA(_psp, _addr, _min_value, _max_value) { \
.psp = _psp, \
.addr = _addr, \
.min_value = _min_value, \
.max_value = _max_value, \
}
static const struct bq20z75_device_data {
enum power_supply_property psp;
u8 addr;
int min_value;
int max_value;
} bq20z75_data[] = {
[REG_MANUFACTURER_DATA] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
[REG_TEMPERATURE] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
[REG_VOLTAGE] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
[REG_CURRENT] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768,
32767),
[REG_CAPACITY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0E, 0, 100),
[REG_REMAINING_CAPACITY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
[REG_REMAINING_CAPACITY_CHARGE] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
[REG_FULL_CHARGE_CAPACITY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
[REG_FULL_CHARGE_CAPACITY_CHARGE] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
[REG_TIME_TO_EMPTY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0,
65535),
[REG_TIME_TO_FULL] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0,
65535),
[REG_STATUS] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
[REG_CYCLE_COUNT] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
[REG_DESIGN_CAPACITY] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0,
65535),
[REG_DESIGN_CAPACITY_CHARGE] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0,
65535),
[REG_DESIGN_VOLTAGE] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0,
65535),
[REG_SERIAL_NUMBER] =
BQ20Z75_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
};
static enum power_supply_property bq20z75_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
POWER_SUPPLY_PROP_SERIAL_NUMBER,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_ENERGY_FULL,
POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
};
struct bq20z75_info {
struct i2c_client *client;
struct power_supply power_supply;
struct bq20z75_platform_data *pdata;
bool is_present;
bool gpio_detect;
bool enable_detection;
int irq;
};
static int bq20z75_read_word_data(struct i2c_client *client, u8 address)
{
struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
s32 ret = 0;
int retries = 1;
if (bq20z75_device->pdata)
retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
while (retries > 0) {
ret = i2c_smbus_read_word_data(client, address);
if (ret >= 0)
break;
retries--;
}
if (ret < 0) {
dev_dbg(&client->dev,
"%s: i2c read at address 0x%x failed\n",
__func__, address);
return ret;
}
return le16_to_cpu(ret);
}
static int bq20z75_write_word_data(struct i2c_client *client, u8 address,
u16 value)
{
struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
s32 ret = 0;
int retries = 1;
if (bq20z75_device->pdata)
retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
while (retries > 0) {
ret = i2c_smbus_write_word_data(client, address,
le16_to_cpu(value));
if (ret >= 0)
break;
retries--;
}
if (ret < 0) {
dev_dbg(&client->dev,
"%s: i2c write to address 0x%x failed\n",
__func__, address);
return ret;
}
return 0;
}
static int bq20z75_get_battery_presence_and_health(
struct i2c_client *client, enum power_supply_property psp,
union power_supply_propval *val)
{
s32 ret;
struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
if (psp == POWER_SUPPLY_PROP_PRESENT &&
bq20z75_device->gpio_detect) {
ret = gpio_get_value(
bq20z75_device->pdata->battery_detect);
if (ret == bq20z75_device->pdata->battery_detect_present)
val->intval = 1;
else
val->intval = 0;
bq20z75_device->is_present = val->intval;
return ret;
}
/* Write to ManufacturerAccess with
* ManufacturerAccess command and then
* read the status */
ret = bq20z75_write_word_data(client,
bq20z75_data[REG_MANUFACTURER_DATA].addr,
MANUFACTURER_ACCESS_STATUS);
if (ret < 0) {
if (psp == POWER_SUPPLY_PROP_PRESENT)
val->intval = 0; /* battery removed */
return ret;
}
ret = bq20z75_read_word_data(client,
bq20z75_data[REG_MANUFACTURER_DATA].addr);
if (ret < 0)
return ret;
if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value ||
ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) {
val->intval = 0;
return 0;
}
/* Mask the upper nibble of 2nd byte and
* lower byte of response then
* shift the result by 8 to get status*/
ret &= 0x0F00;
ret >>= 8;
if (psp == POWER_SUPPLY_PROP_PRESENT) {
if (ret == 0x0F)
/* battery removed */
val->intval = 0;
else
val->intval = 1;
} else if (psp == POWER_SUPPLY_PROP_HEALTH) {
if (ret == 0x09)
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
else if (ret == 0x0B)
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (ret == 0x0C)
val->intval = POWER_SUPPLY_HEALTH_DEAD;
else
val->intval = POWER_SUPPLY_HEALTH_GOOD;
}
return 0;
}
static int bq20z75_get_battery_property(struct i2c_client *client,
int reg_offset, enum power_supply_property psp,
union power_supply_propval *val)
{
s32 ret;
ret = bq20z75_read_word_data(client,
bq20z75_data[reg_offset].addr);
if (ret < 0)
return ret;
/* returned values are 16 bit */
if (bq20z75_data[reg_offset].min_value < 0)
ret = (s16)ret;
if (ret >= bq20z75_data[reg_offset].min_value &&
ret <= bq20z75_data[reg_offset].max_value) {
val->intval = ret;
if (psp == POWER_SUPPLY_PROP_STATUS) {
if (ret & BATTERY_FULL_CHARGED)
val->intval = POWER_SUPPLY_STATUS_FULL;
else if (ret & BATTERY_FULL_DISCHARGED)
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
else if (ret & BATTERY_DISCHARGING)
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
else
val->intval = POWER_SUPPLY_STATUS_CHARGING;
}
} else {
if (psp == POWER_SUPPLY_PROP_STATUS)
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
else
val->intval = 0;
}
return 0;
}
static void bq20z75_unit_adjustment(struct i2c_client *client,
enum power_supply_property psp, union power_supply_propval *val)
{
#define BASE_UNIT_CONVERSION 1000
#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
#define TIME_UNIT_CONVERSION 600
#define TEMP_KELVIN_TO_CELCIUS 2731
switch (psp) {
case POWER_SUPPLY_PROP_ENERGY_NOW:
case POWER_SUPPLY_PROP_ENERGY_FULL:
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
val->intval *= BATTERY_MODE_CAP_MULT_WATT;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
case POWER_SUPPLY_PROP_CURRENT_NOW:
case POWER_SUPPLY_PROP_CHARGE_NOW:
case POWER_SUPPLY_PROP_CHARGE_FULL:
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
val->intval *= BASE_UNIT_CONVERSION;
break;
case POWER_SUPPLY_PROP_TEMP:
/* bq20z75 provides battery tempreture in 0.1°K
* so convert it to 0.1°C */
val->intval -= TEMP_KELVIN_TO_CELCIUS;
val->intval *= 10;
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
val->intval *= TIME_UNIT_CONVERSION;
break;
default:
dev_dbg(&client->dev,
"%s: no need for unit conversion %d\n", __func__, psp);
}
}
static enum bq20z75_battery_mode
bq20z75_set_battery_mode(struct i2c_client *client,
enum bq20z75_battery_mode mode)
{
int ret, original_val;
original_val = bq20z75_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 = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret);
if (ret < 0)
return ret;
return original_val & BATTERY_MODE_MASK;
}
static int bq20z75_get_battery_capacity(struct i2c_client *client,
int reg_offset, enum power_supply_property psp,
union power_supply_propval *val)
{
s32 ret;
enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS;
if (power_supply_is_amp_property(psp))
mode = BATTERY_MODE_AMPS;
mode = bq20z75_set_battery_mode(client, mode);
if (mode < 0)
return mode;
ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr);
if (ret < 0)
return ret;
if (psp == POWER_SUPPLY_PROP_CAPACITY) {
/* bq20z75 spec says that this can be >100 %
* even if max value is 100 % */
val->intval = min(ret, 100);
} else
val->intval = ret;
ret = bq20z75_set_battery_mode(client, mode);
if (ret < 0)
return ret;
return 0;
}
static char bq20z75_serial[5];
static int bq20z75_get_battery_serial_number(struct i2c_client *client,
union power_supply_propval *val)
{
int ret;
ret = bq20z75_read_word_data(client,
bq20z75_data[REG_SERIAL_NUMBER].addr);
if (ret < 0)
return ret;
ret = sprintf(bq20z75_serial, "%04x", ret);
val->strval = bq20z75_serial;
return 0;
}
static int bq20z75_get_property_index(struct i2c_client *client,
enum power_supply_property psp)
{
int count;
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 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;
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);
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);
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;
/* 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");
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