mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
276 lines
6.6 KiB
276 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Battery measurement code for WM97xx |
|
* |
|
* based on tosa_battery.c |
|
* |
|
* Copyright (C) 2008 Marek Vasut <[email protected]> |
|
*/ |
|
|
|
#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_LICENSE("GPL"); |
|
MODULE_AUTHOR("Marek Vasut <[email protected]>"); |
|
MODULE_DESCRIPTION("WM97xx battery driver");
|
|
|