[RK3288][Android6.0] 调试笔记 --- 伪电池驱动添加

Platform: ROCKCHIP
OS: Android 6.0
Kernel: 3.10.92

由于电池部分是用户空间Service从另外一颗MCU获取,而Android需要显示电量,
所以按照电池驱动框架做了一个伪电池驱动, 主要是使用它的充电状态和电池电量
这两个property, 代码如下:

/* drivers/power/rk3288_battery.c
*
* Power supply driver for the rk3288
*
* Copyright (C) 2008 Google, Inc.
* Author: kris.fei<kris_fei@126.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/

#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/of.h>
#include <linux/of_device.h>

//#define DEBUG

struct rk3288_battery_data {
   int status;
   int health;
   int present;
   int capacity;

struct power_supply battery;
};

static struct rk3288_battery_data *battery_data;

static enum power_supply_property rk3288_battery_props[] = {
   POWER_SUPPLY_PROP_STATUS,
   POWER_SUPPLY_PROP_HEALTH,
   POWER_SUPPLY_PROP_PRESENT,
   POWER_SUPPLY_PROP_TECHNOLOGY,
   POWER_SUPPLY_PROP_CAPACITY,
};

static int rk3288_battery_get_property(struct power_supply *psy,
               enum power_supply_property psp,
               union power_supply_propval *val)
{
   struct rk3288_battery_data *data = container_of(psy,
       struct rk3288_battery_data, battery);
   int ret = 0;

#ifdef DEBUG
printk("%s : property: %d \n", __func__, psp);
#endif

switch (psp) {
   case POWER_SUPPLY_PROP_STATUS:
       val->intval = data->status;
       break;
   case POWER_SUPPLY_PROP_HEALTH:
       val->intval = data->health ;
       break;
   case POWER_SUPPLY_PROP_PRESENT:
       val->intval = data->present ;
       break;
   case POWER_SUPPLY_PROP_TECHNOLOGY:
       val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
       break;
   case POWER_SUPPLY_PROP_CAPACITY:
       val->intval = data->capacity ;
       break;
   default:
       ret = -EINVAL;
       break;
   }

return ret;
}

static int rk3288_battery_set_property(struct power_supply *psy,
           enum power_supply_property psp,
           const union power_supply_propval *val)
{
   struct rk3288_battery_data *data = container_of(psy,
       struct rk3288_battery_data, battery);
   int ret = 0;
   int value = val->intval;

#ifdef DEBUG
printk("%s :psp:%d val:%d\n", __func__, psp, value);
#endif

switch (psp) {
   case POWER_SUPPLY_PROP_STATUS:
       if (value <= POWER_SUPPLY_STATUS_FULL) {
           data->status =value;
       } else {
           printk("Unreasonable value:%d\n", value);
           ret = 1;
       }
       break;
   case POWER_SUPPLY_PROP_HEALTH:
       if (value <= POWER_SUPPLY_HEALTH_COLD) {
           data->health = value;
       } else {
           printk("Unreasonable value:%d\n", value);
           ret = 1;
       }
       break;
   case POWER_SUPPLY_PROP_PRESENT:
       data->present = value;
       break;
   case POWER_SUPPLY_PROP_CAPACITY:
       //Capacity from 0 to 100.
       if (value > 0 && value <= 100) {
           data->capacity = value;
       } else {
           printk("Unreasonable value:%d\n", value);
           ret = 1;
       }
       break;
   default:
       ret = -EINVAL;
       break;
   }

//Send uevent.
power_supply_changed(&battery_data->battery);

return ret;
}

static int rk3288_battery_is_writeable(struct power_supply *psy,
               enum power_supply_property psp)
{
   switch (psp) {
   //Need to be written from medusa service.
   case POWER_SUPPLY_PROP_CAPACITY:
   case POWER_SUPPLY_PROP_STATUS:
   case POWER_SUPPLY_PROP_PRESENT:
   case POWER_SUPPLY_PROP_HEALTH:
       return 1;

default:
break;
}

return 0;
}

static int rk3288_battery_probe(struct platform_device *pdev)
{
int ret;
struct rk3288_battery_data *data;

data = kzalloc(sizeof(*data), GFP_KERNEL);
   if (data == NULL) {
       ret = -ENOMEM;
       goto err_data_alloc_failed;
   }

data->battery.properties = rk3288_battery_props;
   data->battery.num_properties = ARRAY_SIZE(rk3288_battery_props);
   data->battery.get_property = rk3288_battery_get_property;
   data->battery.name = "battery";
   data->battery.type = POWER_SUPPLY_TYPE_BATTERY;
   data->battery.set_property = rk3288_battery_set_property;
   data->battery.property_is_writeable = rk3288_battery_is_writeable;

data->present = 1;   //Present
   data->status = POWER_SUPPLY_STATUS_UNKNOWN;
   data->health = POWER_SUPPLY_HEALTH_GOOD;
   data ->capacity = 1;

ret = power_supply_register(&pdev->dev, &data->battery);
if (ret)
goto err_battery_failed;

platform_set_drvdata(pdev, data);
battery_data = data;

return 0;

err_battery_failed:
kfree(data);
err_data_alloc_failed:
return ret;
}

static int rk3288_battery_remove(struct platform_device *pdev)
{
struct rk3288_battery_data *data = platform_get_drvdata(pdev);

power_supply_unregister(&data->battery);

kfree(data);
battery_data = NULL;
return 0;
}

static const struct of_device_id rk3288_battery[] = {
{ .compatible = "rk3288,battery" },
{ /* Sentinel */ }
};

static struct platform_driver rk3288_battery_driver = {
   .probe       = rk3288_battery_probe,
   .remove       = rk3288_battery_remove,
   .driver = {
       .owner = THIS_MODULE,
       .name = "rk3288-battery",
       .of_match_table = of_match_ptr(rk3288_battery),
   }
};

static int __init rk3288_battery_init(void)
{
return platform_driver_register(&rk3288_battery_driver);
}

static void __exit rk3288_battery_exit(void)
{
platform_driver_unregister(&rk3288_battery_driver);
}

module_init(rk3288_battery_init);
module_exit(rk3288_battery_exit);

MODULE_AUTHOR("kris.fei");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Battery driver");

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