276 lines
6.5 KiB
C
276 lines
6.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* Battery measurement code for WM97xx
|
||
|
|
*
|
||
|
|
* based on tosa_battery.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/power_supply.h>
|
||
|
|
#include <linux/wm97xx.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/gpio/consumer.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
|
||
|
|
static struct work_struct bat_work;
|
||
|
|
static struct gpio_desc *charge_gpiod;
|
||
|
|
static DEFINE_MUTEX(work_lock);
|
||
|
|
static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
|
||
|
|
static enum power_supply_property *prop;
|
||
|
|
|
||
|
|
static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
|
||
|
|
{
|
||
|
|
struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
|
||
|
|
|
||
|
|
return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
|
||
|
|
pdata->batt_aux) * pdata->batt_mult /
|
||
|
|
pdata->batt_div;
|
||
|
|
}
|
||
|
|
|
||
|
|
static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
|
||
|
|
{
|
||
|
|
struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
|
||
|
|
|
||
|
|
return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
|
||
|
|
pdata->temp_aux) * pdata->temp_mult /
|
||
|
|
pdata->temp_div;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int wm97xx_bat_get_property(struct power_supply *bat_ps,
|
||
|
|
enum power_supply_property psp,
|
||
|
|
union power_supply_propval *val)
|
||
|
|
{
|
||
|
|
struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
|
||
|
|
|
||
|
|
switch (psp) {
|
||
|
|
case POWER_SUPPLY_PROP_STATUS:
|
||
|
|
val->intval = bat_status;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
||
|
|
val->intval = pdata->batt_tech;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
||
|
|
if (pdata->batt_aux >= 0)
|
||
|
|
val->intval = wm97xx_read_bat(bat_ps);
|
||
|
|
else
|
||
|
|
return -EINVAL;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_TEMP:
|
||
|
|
if (pdata->temp_aux >= 0)
|
||
|
|
val->intval = wm97xx_read_temp(bat_ps);
|
||
|
|
else
|
||
|
|
return -EINVAL;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
|
||
|
|
if (pdata->max_voltage >= 0)
|
||
|
|
val->intval = pdata->max_voltage;
|
||
|
|
else
|
||
|
|
return -EINVAL;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
|
||
|
|
if (pdata->min_voltage >= 0)
|
||
|
|
val->intval = pdata->min_voltage;
|
||
|
|
else
|
||
|
|
return -EINVAL;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
||
|
|
val->intval = 1;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
|
||
|
|
{
|
||
|
|
schedule_work(&bat_work);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void wm97xx_bat_update(struct power_supply *bat_ps)
|
||
|
|
{
|
||
|
|
int old_status = bat_status;
|
||
|
|
|
||
|
|
mutex_lock(&work_lock);
|
||
|
|
|
||
|
|
bat_status = (charge_gpiod) ?
|
||
|
|
(gpiod_get_value(charge_gpiod) ?
|
||
|
|
POWER_SUPPLY_STATUS_DISCHARGING :
|
||
|
|
POWER_SUPPLY_STATUS_CHARGING) :
|
||
|
|
POWER_SUPPLY_STATUS_UNKNOWN;
|
||
|
|
|
||
|
|
if (old_status != bat_status) {
|
||
|
|
pr_debug("%s: %i -> %i\n", bat_ps->desc->name, old_status,
|
||
|
|
bat_status);
|
||
|
|
power_supply_changed(bat_ps);
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_unlock(&work_lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct power_supply *bat_psy;
|
||
|
|
static struct power_supply_desc bat_psy_desc = {
|
||
|
|
.type = POWER_SUPPLY_TYPE_BATTERY,
|
||
|
|
.get_property = wm97xx_bat_get_property,
|
||
|
|
.external_power_changed = wm97xx_bat_external_power_changed,
|
||
|
|
.use_for_apm = 1,
|
||
|
|
};
|
||
|
|
|
||
|
|
static void wm97xx_bat_work(struct work_struct *work)
|
||
|
|
{
|
||
|
|
wm97xx_bat_update(bat_psy);
|
||
|
|
}
|
||
|
|
|
||
|
|
static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
|
||
|
|
{
|
||
|
|
schedule_work(&bat_work);
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM
|
||
|
|
static int wm97xx_bat_suspend(struct device *dev)
|
||
|
|
{
|
||
|
|
flush_work(&bat_work);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int wm97xx_bat_resume(struct device *dev)
|
||
|
|
{
|
||
|
|
schedule_work(&bat_work);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct dev_pm_ops wm97xx_bat_pm_ops = {
|
||
|
|
.suspend = wm97xx_bat_suspend,
|
||
|
|
.resume = wm97xx_bat_resume,
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static int wm97xx_bat_probe(struct platform_device *dev)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
|
||
|
|
int i = 0;
|
||
|
|
struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
|
||
|
|
struct power_supply_config cfg = {};
|
||
|
|
|
||
|
|
if (!pdata) {
|
||
|
|
dev_err(&dev->dev, "No platform data supplied\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
cfg.drv_data = pdata;
|
||
|
|
|
||
|
|
if (dev->id != -1)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
charge_gpiod = devm_gpiod_get_optional(&dev->dev, NULL, GPIOD_IN);
|
||
|
|
if (IS_ERR(charge_gpiod))
|
||
|
|
return dev_err_probe(&dev->dev,
|
||
|
|
PTR_ERR(charge_gpiod),
|
||
|
|
"failed to get charge GPIO\n");
|
||
|
|
if (charge_gpiod) {
|
||
|
|
gpiod_set_consumer_name(charge_gpiod, "BATT CHRG");
|
||
|
|
ret = request_irq(gpiod_to_irq(charge_gpiod),
|
||
|
|
wm97xx_chrg_irq, 0,
|
||
|
|
"AC Detect", dev);
|
||
|
|
if (ret)
|
||
|
|
return dev_err_probe(&dev->dev, ret,
|
||
|
|
"failed to request GPIO irq\n");
|
||
|
|
props++; /* POWER_SUPPLY_PROP_STATUS */
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pdata->batt_tech >= 0)
|
||
|
|
props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
|
||
|
|
if (pdata->temp_aux >= 0)
|
||
|
|
props++; /* POWER_SUPPLY_PROP_TEMP */
|
||
|
|
if (pdata->batt_aux >= 0)
|
||
|
|
props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
|
||
|
|
if (pdata->max_voltage >= 0)
|
||
|
|
props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
|
||
|
|
if (pdata->min_voltage >= 0)
|
||
|
|
props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
|
||
|
|
|
||
|
|
prop = kcalloc(props, sizeof(*prop), GFP_KERNEL);
|
||
|
|
if (!prop) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto err3;
|
||
|
|
}
|
||
|
|
|
||
|
|
prop[i++] = POWER_SUPPLY_PROP_PRESENT;
|
||
|
|
if (charge_gpiod)
|
||
|
|
prop[i++] = POWER_SUPPLY_PROP_STATUS;
|
||
|
|
if (pdata->batt_tech >= 0)
|
||
|
|
prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
|
||
|
|
if (pdata->temp_aux >= 0)
|
||
|
|
prop[i++] = POWER_SUPPLY_PROP_TEMP;
|
||
|
|
if (pdata->batt_aux >= 0)
|
||
|
|
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
|
||
|
|
if (pdata->max_voltage >= 0)
|
||
|
|
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
|
||
|
|
if (pdata->min_voltage >= 0)
|
||
|
|
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
|
||
|
|
|
||
|
|
INIT_WORK(&bat_work, wm97xx_bat_work);
|
||
|
|
|
||
|
|
if (!pdata->batt_name) {
|
||
|
|
dev_info(&dev->dev, "Please consider setting proper battery "
|
||
|
|
"name in platform definition file, falling "
|
||
|
|
"back to name \"wm97xx-batt\"\n");
|
||
|
|
bat_psy_desc.name = "wm97xx-batt";
|
||
|
|
} else
|
||
|
|
bat_psy_desc.name = pdata->batt_name;
|
||
|
|
|
||
|
|
bat_psy_desc.properties = prop;
|
||
|
|
bat_psy_desc.num_properties = props;
|
||
|
|
|
||
|
|
bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, &cfg);
|
||
|
|
if (!IS_ERR(bat_psy)) {
|
||
|
|
schedule_work(&bat_work);
|
||
|
|
} else {
|
||
|
|
ret = PTR_ERR(bat_psy);
|
||
|
|
goto err4;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
err4:
|
||
|
|
kfree(prop);
|
||
|
|
err3:
|
||
|
|
if (charge_gpiod)
|
||
|
|
free_irq(gpiod_to_irq(charge_gpiod), dev);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int wm97xx_bat_remove(struct platform_device *dev)
|
||
|
|
{
|
||
|
|
if (charge_gpiod)
|
||
|
|
free_irq(gpiod_to_irq(charge_gpiod), dev);
|
||
|
|
cancel_work_sync(&bat_work);
|
||
|
|
power_supply_unregister(bat_psy);
|
||
|
|
kfree(prop);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver wm97xx_bat_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "wm97xx-battery",
|
||
|
|
#ifdef CONFIG_PM
|
||
|
|
.pm = &wm97xx_bat_pm_ops,
|
||
|
|
#endif
|
||
|
|
},
|
||
|
|
.probe = wm97xx_bat_probe,
|
||
|
|
.remove = wm97xx_bat_remove,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(wm97xx_bat_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
|
||
|
|
MODULE_DESCRIPTION("WM97xx battery driver");
|