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bq20z75: Add optional battery detect gpio 

Adding support for an optional gpio for battery detection. This is
passed in through the i2c platform data. It also accepts another
field, battery_detect_present to signify the gpio state which means
the battery is present, either 0 (low) or 1 (high).

Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Rhyland Klein 2011-02-28 16:55:28 -08:00 committed by Anton Vorontsov
parent b5db7cde69
commit bb87910160
2 changed files with 166 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

160
drivers/power/bq20z75.c
View File

@ -25,6 +25,10 @@
#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,
@ -141,8 +145,13 @@ static enum power_supply_property bq20z75_properties[] = {
};
struct bq20z75_info {
struct i2c_client *client;
struct power_supply power_supply;
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)
@ -179,6 +188,18 @@ static int bq20z75_get_battery_presence_and_health(
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;
return ret;
}
/* Write to ManufacturerAccess with
* ManufacturerAccess command and then
@ -192,8 +213,11 @@ static int bq20z75_get_battery_presence_and_health(
ret = bq20z75_read_word_data(client,
bq20z75_data[REG_MANUFACTURER_DATA].addr);
if (ret < 0)
if (ret < 0) {
if (psp == POWER_SUPPLY_PROP_PRESENT)
val->intval = 0; /* battery removed */
return ret;
}
if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value ||
ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) {
@ -397,8 +421,7 @@ static int bq20z75_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
int ps_index;
int ret;
int ret = 0;
struct bq20z75_info *bq20z75_device = container_of(psy,
struct bq20z75_info, power_supply);
struct i2c_client *client = bq20z75_device->client;
@ -407,8 +430,6 @@ static int bq20z75_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_PRESENT:
case POWER_SUPPLY_PROP_HEALTH:
ret = bq20z75_get_battery_presence_and_health(client, psp, val);
if (ret)
return ret;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
@ -422,20 +443,15 @@ static int bq20z75_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_CHARGE_FULL:
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
case POWER_SUPPLY_PROP_CAPACITY:
ps_index = bq20z75_get_property_index(client, psp);
if (ps_index < 0)
return ps_index;
ret = bq20z75_get_battery_capacity(client, ps_index, psp, val);
if (ret)
return ret;
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);
if (ret)
return ret;
break;
case POWER_SUPPLY_PROP_STATUS:
@ -446,14 +462,11 @@ static int bq20z75_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
ps_index = bq20z75_get_property_index(client, psp);
if (ps_index < 0)
return ps_index;
ret = bq20z75_get_battery_property(client, ps_index, psp, val);
if (ret)
return ret;
ret = bq20z75_get_property_index(client, psp);
if (ret < 0)
break;
ret = bq20z75_get_battery_property(client, ret, psp, val);
break;
default:
@ -462,26 +475,51 @@ static int bq20z75_get_property(struct power_supply *psy,
return -EINVAL;
}
/* Convert units to match requirements for power supply class */
bq20z75_unit_adjustment(client, psp, val);
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 = %d\n", __func__, psp, val->intval);
return 0;
return ret;
}
static int bq20z75_probe(struct i2c_client *client,
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;
@ -489,26 +527,86 @@ static int bq20z75_probe(struct i2c_client *client,
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__);
kfree(bq20z75_device);
return rc;
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 bq20z75_remove(struct i2c_client *client)
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;
@ -544,7 +642,7 @@ static const struct i2c_device_id bq20z75_id[] = {
static struct i2c_driver bq20z75_battery_driver = {
.probe = bq20z75_probe,
.remove = bq20z75_remove,
.remove = __devexit_p(bq20z75_remove),
.suspend = bq20z75_suspend,
.resume = bq20z75_resume,
.id_table = bq20z75_id,

37
include/linux/power/bq20z75.h Normal file
View File

@ -0,0 +1,37 @@
/*
* 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.
*/
#ifndef __LINUX_POWER_BQ20Z75_H_
#define __LINUX_POWER_BQ20Z75_H_
#include <linux/power_supply.h>
#include <linux/types.h>
/**
* struct bq20z75_platform_data - platform data for bq20z75 devices
* @battery_detect: GPIO which is used to detect battery presence
* @battery_detect_present: gpio state when battery is present (0 / 1)
*/
struct bq20z75_platform_data {
int battery_detect;
int battery_detect_present;
};
#endif