mirror of https://gitee.com/openkylin/linux.git
331 lines
8.0 KiB
C
331 lines
8.0 KiB
C
/*
|
|
* Battery measurement code for Zipit Z2
|
|
*
|
|
* Copyright (C) 2009 Peter Edwards <sweetlilmre@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/z2_battery.h>
|
|
|
|
#define Z2_DEFAULT_NAME "Z2"
|
|
|
|
struct z2_charger {
|
|
struct z2_battery_info *info;
|
|
int bat_status;
|
|
struct i2c_client *client;
|
|
struct power_supply *batt_ps;
|
|
struct power_supply_desc batt_ps_desc;
|
|
struct mutex work_lock;
|
|
struct work_struct bat_work;
|
|
};
|
|
|
|
static unsigned long z2_read_bat(struct z2_charger *charger)
|
|
{
|
|
int data;
|
|
data = i2c_smbus_read_byte_data(charger->client,
|
|
charger->info->batt_I2C_reg);
|
|
if (data < 0)
|
|
return 0;
|
|
|
|
return data * charger->info->batt_mult / charger->info->batt_div;
|
|
}
|
|
|
|
static int z2_batt_get_property(struct power_supply *batt_ps,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct z2_charger *charger = power_supply_get_drvdata(batt_ps);
|
|
struct z2_battery_info *info = charger->info;
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
val->intval = charger->bat_status;
|
|
break;
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
|
val->intval = info->batt_tech;
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
if (info->batt_I2C_reg >= 0)
|
|
val->intval = z2_read_bat(charger);
|
|
else
|
|
return -EINVAL;
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
|
|
if (info->max_voltage >= 0)
|
|
val->intval = info->max_voltage;
|
|
else
|
|
return -EINVAL;
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
|
|
if (info->min_voltage >= 0)
|
|
val->intval = info->min_voltage;
|
|
else
|
|
return -EINVAL;
|
|
break;
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
val->intval = 1;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void z2_batt_ext_power_changed(struct power_supply *batt_ps)
|
|
{
|
|
struct z2_charger *charger = power_supply_get_drvdata(batt_ps);
|
|
|
|
schedule_work(&charger->bat_work);
|
|
}
|
|
|
|
static void z2_batt_update(struct z2_charger *charger)
|
|
{
|
|
int old_status = charger->bat_status;
|
|
struct z2_battery_info *info;
|
|
|
|
info = charger->info;
|
|
|
|
mutex_lock(&charger->work_lock);
|
|
|
|
charger->bat_status = (info->charge_gpio >= 0) ?
|
|
(gpio_get_value(info->charge_gpio) ?
|
|
POWER_SUPPLY_STATUS_CHARGING :
|
|
POWER_SUPPLY_STATUS_DISCHARGING) :
|
|
POWER_SUPPLY_STATUS_UNKNOWN;
|
|
|
|
if (old_status != charger->bat_status) {
|
|
pr_debug("%s: %i -> %i\n", charger->batt_ps->desc->name,
|
|
old_status,
|
|
charger->bat_status);
|
|
power_supply_changed(charger->batt_ps);
|
|
}
|
|
|
|
mutex_unlock(&charger->work_lock);
|
|
}
|
|
|
|
static void z2_batt_work(struct work_struct *work)
|
|
{
|
|
struct z2_charger *charger;
|
|
charger = container_of(work, struct z2_charger, bat_work);
|
|
z2_batt_update(charger);
|
|
}
|
|
|
|
static irqreturn_t z2_charge_switch_irq(int irq, void *devid)
|
|
{
|
|
struct z2_charger *charger = devid;
|
|
schedule_work(&charger->bat_work);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int z2_batt_ps_init(struct z2_charger *charger, int props)
|
|
{
|
|
int i = 0;
|
|
enum power_supply_property *prop;
|
|
struct z2_battery_info *info = charger->info;
|
|
|
|
if (info->charge_gpio >= 0)
|
|
props++; /* POWER_SUPPLY_PROP_STATUS */
|
|
if (info->batt_tech >= 0)
|
|
props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
|
|
if (info->batt_I2C_reg >= 0)
|
|
props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
|
|
if (info->max_voltage >= 0)
|
|
props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
|
|
if (info->min_voltage >= 0)
|
|
props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
|
|
|
|
prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
|
|
if (!prop)
|
|
return -ENOMEM;
|
|
|
|
prop[i++] = POWER_SUPPLY_PROP_PRESENT;
|
|
if (info->charge_gpio >= 0)
|
|
prop[i++] = POWER_SUPPLY_PROP_STATUS;
|
|
if (info->batt_tech >= 0)
|
|
prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
|
|
if (info->batt_I2C_reg >= 0)
|
|
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
|
|
if (info->max_voltage >= 0)
|
|
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
|
|
if (info->min_voltage >= 0)
|
|
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
|
|
|
|
if (!info->batt_name) {
|
|
dev_info(&charger->client->dev,
|
|
"Please consider setting proper battery "
|
|
"name in platform definition file, falling "
|
|
"back to name \" Z2_DEFAULT_NAME \"\n");
|
|
charger->batt_ps_desc.name = Z2_DEFAULT_NAME;
|
|
} else
|
|
charger->batt_ps_desc.name = info->batt_name;
|
|
|
|
charger->batt_ps_desc.properties = prop;
|
|
charger->batt_ps_desc.num_properties = props;
|
|
charger->batt_ps_desc.type = POWER_SUPPLY_TYPE_BATTERY;
|
|
charger->batt_ps_desc.get_property = z2_batt_get_property;
|
|
charger->batt_ps_desc.external_power_changed =
|
|
z2_batt_ext_power_changed;
|
|
charger->batt_ps_desc.use_for_apm = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int z2_batt_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret = 0;
|
|
int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
|
|
struct z2_charger *charger;
|
|
struct z2_battery_info *info = client->dev.platform_data;
|
|
struct power_supply_config psy_cfg = {};
|
|
|
|
if (info == NULL) {
|
|
dev_err(&client->dev,
|
|
"Please set platform device platform_data"
|
|
" to a valid z2_battery_info pointer!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
charger = kzalloc(sizeof(*charger), GFP_KERNEL);
|
|
if (charger == NULL)
|
|
return -ENOMEM;
|
|
|
|
charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
charger->info = info;
|
|
charger->client = client;
|
|
i2c_set_clientdata(client, charger);
|
|
psy_cfg.drv_data = charger;
|
|
|
|
mutex_init(&charger->work_lock);
|
|
|
|
if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
|
|
ret = gpio_request(info->charge_gpio, "BATT CHRG");
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = gpio_direction_input(info->charge_gpio);
|
|
if (ret)
|
|
goto err2;
|
|
|
|
irq_set_irq_type(gpio_to_irq(info->charge_gpio),
|
|
IRQ_TYPE_EDGE_BOTH);
|
|
ret = request_irq(gpio_to_irq(info->charge_gpio),
|
|
z2_charge_switch_irq, 0,
|
|
"AC Detect", charger);
|
|
if (ret)
|
|
goto err3;
|
|
}
|
|
|
|
ret = z2_batt_ps_init(charger, props);
|
|
if (ret)
|
|
goto err3;
|
|
|
|
INIT_WORK(&charger->bat_work, z2_batt_work);
|
|
|
|
charger->batt_ps = power_supply_register(&client->dev,
|
|
&charger->batt_ps_desc,
|
|
&psy_cfg);
|
|
if (IS_ERR(charger->batt_ps)) {
|
|
ret = PTR_ERR(charger->batt_ps);
|
|
goto err4;
|
|
}
|
|
|
|
schedule_work(&charger->bat_work);
|
|
|
|
return 0;
|
|
|
|
err4:
|
|
kfree(charger->batt_ps_desc.properties);
|
|
err3:
|
|
if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
|
|
free_irq(gpio_to_irq(info->charge_gpio), charger);
|
|
err2:
|
|
if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
|
|
gpio_free(info->charge_gpio);
|
|
err:
|
|
kfree(charger);
|
|
return ret;
|
|
}
|
|
|
|
static int z2_batt_remove(struct i2c_client *client)
|
|
{
|
|
struct z2_charger *charger = i2c_get_clientdata(client);
|
|
struct z2_battery_info *info = charger->info;
|
|
|
|
cancel_work_sync(&charger->bat_work);
|
|
power_supply_unregister(charger->batt_ps);
|
|
|
|
kfree(charger->batt_ps_desc.properties);
|
|
if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
|
|
free_irq(gpio_to_irq(info->charge_gpio), charger);
|
|
gpio_free(info->charge_gpio);
|
|
}
|
|
|
|
kfree(charger);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int z2_batt_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct z2_charger *charger = i2c_get_clientdata(client);
|
|
|
|
flush_work(&charger->bat_work);
|
|
return 0;
|
|
}
|
|
|
|
static int z2_batt_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct z2_charger *charger = i2c_get_clientdata(client);
|
|
|
|
schedule_work(&charger->bat_work);
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops z2_battery_pm_ops = {
|
|
.suspend = z2_batt_suspend,
|
|
.resume = z2_batt_resume,
|
|
};
|
|
|
|
#define Z2_BATTERY_PM_OPS (&z2_battery_pm_ops)
|
|
|
|
#else
|
|
#define Z2_BATTERY_PM_OPS (NULL)
|
|
#endif
|
|
|
|
static const struct i2c_device_id z2_batt_id[] = {
|
|
{ "aer915", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, z2_batt_id);
|
|
|
|
static struct i2c_driver z2_batt_driver = {
|
|
.driver = {
|
|
.name = "z2-battery",
|
|
.pm = Z2_BATTERY_PM_OPS
|
|
},
|
|
.probe = z2_batt_probe,
|
|
.remove = z2_batt_remove,
|
|
.id_table = z2_batt_id,
|
|
};
|
|
module_i2c_driver(z2_batt_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>");
|
|
MODULE_DESCRIPTION("Zipit Z2 battery driver");
|