redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

bq20z75: Add optional battery detect gpio

Browse source 
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