/*
* Generic battery driver code using IIO
* Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com>
* based on jz4740-battery.c
* based on s3c_adc_battery.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
*/
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/iio/consumer.h>
#include <linux/iio/types.h>
#include <linux/power/generic-adc-battery.h>
#define JITTER_DEFAULT 10 /* hope 10ms is enough */
enum gab_chan_type {
GAB_VOLTAGE = 0,
GAB_CURRENT,
GAB_POWER,
GAB_MAX_CHAN_TYPE
};
/*
* gab_chan_name suggests the standard channel names for commonly used
* channel types.
*/
static const char *const gab_chan_name[] = {
[GAB_VOLTAGE] = "voltage",
[GAB_CURRENT] = "current",
[GAB_POWER] = "power",
};
struct gab {
struct power_supply psy;
struct iio_channel *channel[GAB_MAX_CHAN_TYPE];
struct gab_platform_data *pdata;
struct delayed_work bat_work;
int level;
int status;
bool cable_plugged;
};
static struct gab *to_generic_bat(struct power_supply *psy)
{
return container_of(psy, struct gab, psy);
}
static void gab_ext_power_changed(struct power_supply *psy)
{
struct gab *adc_bat = to_generic_bat(psy);
schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
}
static const enum power_supply_property gab_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_MODEL_NAME,
};
/*
* This properties are set based on the received platform data and this
* should correspond one-to-one with enum chan_type.
*/
static const enum power_supply_property gab_dyn_props[] = {
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_POWER_NOW,
};
static bool gab_charge_finished(struct gab *adc_bat)
{
struct gab_platform_data *pdata = adc_bat->pdata;
bool ret = gpio_get_value(pdata->gpio_charge_finished);
bool inv = pdata->gpio_inverted;
if (!gpio_is_valid(pdata->gpio_charge_finished))
return false;
return ret ^ inv;
}
static int gab_get_status(struct gab *adc_bat)
{
struct gab_platform_data *pdata = adc_bat->pdata;
struct power_supply_info *bat_info;
bat_info = &pdata->battery_info;
if (adc_bat->level == bat_info->charge_full_design)
return POWER_SUPPLY_STATUS_FULL;
return adc_bat->status;
}
static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_POWER_NOW:
return GAB_POWER;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
return GAB_VOLTAGE;
case POWER_SUPPLY_PROP_CURRENT_NOW:
return GAB_CURRENT;
default:
WARN_ON(1);
break;
}
return GAB_POWER;
}
static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
int *result)
{
int ret;
int chan_index;
chan_index = gab_prop_to_chan(psp);
ret = iio_read_channel_processed(adc_bat->channel[chan_index],
result);
if (ret < 0)
pr_err("read channel error\n");
return ret;
}
static int gab_get_property(struct power_supply *psy,
enum power_supply_property psp, union power_supply_propval *val)
{
struct gab *adc_bat;
struct gab_platform_data *pdata;
struct power_supply_info *bat_info;
int result = 0;
int ret = 0;
adc_bat = to_generic_bat(psy);
if (!adc_bat) {
dev_err(psy->dev, "no battery infos ?!\n");
return -EINVAL;
}
pdata = adc_bat->pdata;
bat_info = &pdata->battery_info;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
gab_get_status(adc_bat);
break;
case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
val->intval = 0;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
val->intval = pdata->cal_charge(result);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
case POWER_SUPPLY_PROP_CURRENT_NOW:
case POWER_SUPPLY_PROP_POWER_NOW:
ret = read_channel(adc_bat, psp, &result);
if (ret < 0)
goto err;
val->intval = result;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = bat_info->technology;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = bat_info->voltage_min_design;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = bat_info->voltage_max_design;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
val->intval = bat_info->charge_full_design;
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = bat_info->name;
break;
default:
return -EINVAL;
}
err:
return ret;
}
static void gab_work(struct work_struct *work)
{
struct gab *adc_bat;
struct gab_platform_data *pdata;
struct delayed_work *delayed_work;
bool is_plugged;
int status;
delayed_work = container_of(work, struct delayed_work, work);
adc_bat = container_of(delayed_work, struct gab, bat_work);
pdata = adc_bat->pdata;
status = adc_bat->status;
is_plugged = power_supply_am_i_supplied(&adc_bat->psy);
adc_bat->cable_plugged = is_plugged;
if (!is_plugged)
adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
else if (gab_charge_finished(adc_bat))
adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
else
adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;
if (status != adc_bat->status)
power_supply_changed(&adc_bat->psy);
}
static irqreturn_t gab_charged(int irq, void *dev_id)
{
struct gab *adc_bat = dev_id;
struct gab_platform_data *pdata = adc_bat->pdata;
int delay;
delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
schedule_delayed_work(&adc_bat->bat_work,
msecs_to_jiffies(delay));
return IRQ_HANDLED;
}
static int gab_probe(struct platform_device *pdev)
{
struct gab *adc_bat;
struct power_supply *psy;
struct gab_platform_data *pdata = pdev->dev.platform_data;
enum power_supply_property *properties;
int ret = 0;
int chan;
int index = 0;
adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
if (!adc_bat) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
psy = &adc_bat->psy;
psy->name = pdata->battery_info.name;
/* bootup default values for the battery */
adc_bat->cable_plugged = false;
adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
psy->type = POWER_SUPPLY_TYPE_BATTERY;
psy->get_property = gab_get_property;
psy->external_power_changed = gab_ext_power_changed;
adc_bat->pdata = pdata;
/*
* copying the static properties and allocating extra memory for holding
* the extra configurable properties received from platform data.
*/
psy->properties = kcalloc(ARRAY_SIZE(gab_props) +
ARRAY_SIZE(gab_chan_name),
sizeof(*psy->properties), GFP_KERNEL);
if (!psy->properties) {
ret = -ENOMEM;
goto first_mem_fail;
}
memcpy(psy->properties, gab_props, sizeof(gab_props));
properties = (enum power_supply_property *)
((char *)psy->properties + sizeof(gab_props));
/*
* getting channel from iio and copying the battery properties
* based on the channel supported by consumer device.
*/
for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
adc_bat->channel[chan] = iio_channel_get(&pdev->dev,
gab_chan_name[chan]);
if (IS_ERR(adc_bat->channel[chan])) {
ret = PTR_ERR(adc_bat->channel[chan]);
adc_bat->channel[chan] = NULL;
} else {
/* copying properties for supported channels only */
memcpy(properties + sizeof(*(psy->properties)) * index,
&gab_dyn_props[chan],
sizeof(gab_dyn_props[chan]));
index++;
}
}
/* none of the channels are supported so let's bail out */
if (index == 0) {
ret = -ENODEV;
goto second_mem_fail;
}
/*
* Total number of properties is equal to static properties
* plus the dynamic properties.Some properties may not be set
* as come channels may be not be supported by the device.So
* we need to take care of that.
*/
psy->num_properties = ARRAY_SIZE(gab_props) + index;
ret = power_supply_register(&pdev->dev, psy);
if (ret)
goto err_reg_fail;
INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);
if (gpio_is_valid(pdata->gpio_charge_finished)) {
int irq;
ret = gpio_request(pdata->gpio_charge_finished, "charged");
if (ret)
goto gpio_req_fail;
irq = gpio_to_irq(pdata->gpio_charge_finished);
ret = request_any_context_irq(irq, gab_charged,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"battery charged", adc_bat);
if (ret < 0)
goto err_gpio;
}
platform_set_drvdata(pdev, adc_bat);
/* Schedule timer to check current status */
schedule_delayed_work(&adc_bat->bat_work,
msecs_to_jiffies(0));
return 0;
err_gpio:
gpio_free(pdata->gpio_charge_finished);
gpio_req_fail:
power_supply_unregister(psy);
err_reg_fail:
for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
if (adc_bat->channel[chan])
iio_channel_release(adc_bat->channel[chan]);
}
second_mem_fail:
kfree(psy->properties);
first_mem_fail:
return ret;
}
static int gab_remove(struct platform_device *pdev)
{
int chan;
struct gab *adc_bat = platform_get_drvdata(pdev);
struct gab_platform_data *pdata = adc_bat->pdata;
power_supply_unregister(&adc_bat->psy);
if (gpio_is_valid(pdata->gpio_charge_finished)) {
free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat);
gpio_free(pdata->gpio_charge_finished);
}
for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
if (adc_bat->channel[chan])
iio_channel_release(adc_bat->channel[chan]);
}
kfree(adc_bat->psy.properties);
cancel_delayed_work(&adc_bat->bat_work);
return 0;
}
#ifdef CONFIG_PM
static int gab_suspend(struct device *dev)
{
struct gab *adc_bat = dev_get_drvdata(dev);
cancel_delayed_work_sync(&adc_bat->bat_work);
adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
return 0;
}
static int gab_resume(struct device *dev)
{
struct gab *adc_bat = dev_get_drvdata(dev);
struct gab_platform_data *pdata = adc_bat->pdata;
int delay;
delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
/* Schedule timer to check current status */
schedule_delayed_work(&adc_bat->bat_work,
msecs_to_jiffies(delay));
return 0;
}
static const struct dev_pm_ops gab_pm_ops = {
.suspend = gab_suspend,
.resume = gab_resume,
};
#define GAB_PM_OPS (&gab_pm_ops)
#else
#define GAB_PM_OPS (NULL)
#endif
static struct platform_driver gab_driver = {
.driver = {
.name = "generic-adc-battery",
.owner = THIS_MODULE,
.pm = GAB_PM_OPS
},
.probe = gab_probe,
.remove = gab_remove,
};
module_platform_driver(gab_driver);
MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
MODULE_DESCRIPTION("generic battery driver using IIO");
MODULE_LICENSE("GPL");
