linux 电源管理驱动编写

执行流程

驱动结构

1) 内核提供的接口

struct power_supply 在文件 include\linux\power_supply.h 中

2) 提供给用户的接口

sys/class/power_supply

通过 drivers\power\power_supply_core.c 中的

int power_supply_register(struct device *parent,struct power_supply *psy)

来创建.

power_supply_register() 在 K:\linux学习资料\bible\驱动程序开发\电源电池管理\电源电池管理.pdf中介绍

当电源变化时,调用:drivers\power\power_supply_core.c 中的

power_supply_changed()更新sysfs文件系统中的信息.

把握以上两点!

1. 填充 struct power_supply

路径: include/linux/power_supply.h

1.) 结构体含义

struct power_supply {

const char *name; // 名字,例如: "usb", "battary", "ac"

enum power_supply_type type; // 电源类型,在power_supply.h定义,分为usb,battery,ups,mains四种

enum power_supply_property *properties; // 电源属性,比较多,常用的在后面介绍.枚举类型数组

size_t num_properties; // 属性数量,假设为3,则回调get_property()3次

char **supplied_to;

size_t num_supplicants;

int (*get_property)(struct power_supply *psy, // 回调函数,执行power_supply_changed()后被

enum power_supply_property psp, // 调用,调用次数由num_properties决定

union power_supply_propval *val);

int (*set_property)(struct power_supply *psy,

enum power_supply_property psp,

const union power_supply_propval *val);

int (*property_is_writeable)(struct power_supply *psy,

enum power_supply_property psp);

void (*external_power_changed)(struct power_supply *psy);

void (*set_charged)(struct power_supply *psy);

/* For APM emulation, think legacy userspace. */

int use_for_apm;

/* private */

struct device *dev;

struct work_struct changed_work; // 工作队列,相当于一个线程,由它发起power_supply_changed()

spinlock_t changed_lock;

bool changed;

struct wake_lock work_wake_lock;

#ifdef CONFIG_LEDS_TRIGGERS

struct led_trigger *charging_full_trig;

char *charging_full_trig_name;

struct led_trigger *charging_trig;

char *charging_trig_name;

struct led_trigger *full_trig;

char *full_trig_name;

struct led_trigger *online_trig;

char *online_trig_name;

#endif

};

2) 常用的power_supply_propety

android下用到的:

# cat /sys/class/power_supply/ac/type

Mains

# cat /sys/class/power_supply/ac/online

# cd /sys/class/power_supply/battery/

# cat type status health present technology capacity

Battery

Charging

Good

Li-ion

这些宏已经定义过:

enum { // 对应 POWER_SUPPLY_PROP_STATUS

POWER_SUPPLY_STATUS_UNKNOWN = 0,

POWER_SUPPLY_STATUS_CHARGING,

POWER_SUPPLY_STATUS_DISCHARGING,

POWER_SUPPLY_STATUS_NOT_CHARGING,

POWER_SUPPLY_STATUS_FULL,

};

enum { // 对应 POWER_SUPPLY_PROP_CHARGE_TYPE

POWER_SUPPLY_CHARGE_TYPE_UNKNOWN = 0,

POWER_SUPPLY_CHARGE_TYPE_NONE,

POWER_SUPPLY_CHARGE_TYPE_TRICKLE,

POWER_SUPPLY_CHARGE_TYPE_FAST,

};

enum { // 对应 POWER_SUPPLY_PROP_HEALTH

POWER_SUPPLY_HEALTH_UNKNOWN = 0,

POWER_SUPPLY_HEALTH_GOOD,

POWER_SUPPLY_HEALTH_OVERHEAT,

POWER_SUPPLY_HEALTH_DEAD,

POWER_SUPPLY_HEALTH_OVERVOLTAGE,

POWER_SUPPLY_HEALTH_UNSPEC_FAILURE,

POWER_SUPPLY_HEALTH_COLD,

};

enum { // 对应 POWER_SUPPLY_PROP_TECHNOLOGY

POWER_SUPPLY_TECHNOLOGY_UNKNOWN = 0,

POWER_SUPPLY_TECHNOLOGY_NiMH,

POWER_SUPPLY_TECHNOLOGY_LION,

POWER_SUPPLY_TECHNOLOGY_LIPO,

POWER_SUPPLY_TECHNOLOGY_LiFe,

POWER_SUPPLY_TECHNOLOGY_NiCd,

POWER_SUPPLY_TECHNOLOGY_LiMn,

};

enum { // 对应 POWER_SUPPLY_PROP_CAPACITY_LEVEL

POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN = 0,

POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL,

POWER_SUPPLY_CAPACITY_LEVEL_LOW,

POWER_SUPPLY_CAPACITY_LEVEL_NORMAL,

POWER_SUPPLY_CAPACITY_LEVEL_HIGH,

POWER_SUPPLY_CAPACITY_LEVEL_FULL,

};

一个struct power_supply的例子:

struct max17040_chip {

struct power_supply battery; // 三种供电方式

struct power_supply ac;

struct power_supply usb;

struct timespec next_update_time;

struct delayed_work work; // 两个队列

struct delayed_work battary_vol_state_wq;

/* State Of Connect */

int online;

/* battery voltage */

int vcell;

/* battery capacity */

int soc;

/* State Of Charge */

int status;

/* usb online */

int usb_online;

};

struct max17040_chip *chip;

初始化:

chip->battery.name = "battery";

chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;

chip->battery.get_property = max17040_get_property; // 回调函数,执行power_supply_changed()后被调用,调用次数由battery.num_properties决定, 函数内容在下面.

chip->battery.properties = max17040_battery_props; // 内容在下面

chip->battery.num_properties = ARRAY_SIZE(max17040_battery_props);

chip->battery.external_power_changed = NULL;

chip->ac.name = "ac";

chip->ac.type = POWER_SUPPLY_TYPE_MAINS;

chip->ac.get_property = adapter_get_property;

chip->ac.properties = adapter_get_props;

chip->ac.num_properties = ARRAY_SIZE(adapter_get_props);

chip->ac.external_power_changed = NULL;

chip->usb.name = "usb";

chip->usb.type = POWER_SUPPLY_TYPE_USB;

chip->usb.get_property = usb_get_property;

chip->usb.properties = usb_get_props;

chip->usb.num_properties = ARRAY_SIZE(usb_get_props);

chip->usb.external_power_changed = NULL;

// 两个队列

INIT_DELAYED_WORK_DEFERRABLE(&chip->work, work_max17040);

INIT_DELAYED_WORK_DEFERRABLE(&chip->battary_vol_state_wq, work_battary_vol_sample);

schedule_delayed_work(&chip->work, MAX17040_DELAY);

schedule_delayed_work(&chip->battary_vol_state_wq, POLLING_BATTARY_VOL_MSEC);

max17040_battery_props[] 枚举类型数组内容

static enum power_supply_property max17040_battery_props[] = { // 一共有7项,

// 意味着max17040_get_property()将被回调7次

POWER_SUPPLY_PROP_PRESENT,

POWER_SUPPLY_PROP_STATUS,

/*POWER_SUPPLY_PROP_ONLINE,*/

POWER_SUPPLY_PROP_VOLTAGE_NOW,

POWER_SUPPLY_PROP_CAPACITY,

POWER_SUPPLY_PROP_TECHNOLOGY,

POWER_SUPPLY_PROP_HEALTH,

POWER_SUPPLY_PROP_TEMP,

};

max17040_get_property() 函数:

static int max17040_get_property(struct power_supply *psy,

enum power_supply_property psp,

union power_supply_propval *val)

{

dev_info(dev,"%s \n", __func__);

switch (psp) { // 一共有7项, 将被回调7次. 执行power_supply_changed()后被回调.

case POWER_SUPPLY_PROP_STATUS:

val->intval = chip->status;

break;

case POWER_SUPPLY_PROP_ONLINE:

val->intval = 1;

break;

case POWER_SUPPLY_PROP_VOLTAGE_NOW:

case POWER_SUPPLY_PROP_PRESENT:

val->intval = 3800;//chip->vcell;

if(psp == POWER_SUPPLY_PROP_PRESENT)

val->intval = 1; /* You must never run Odrioid1 without Battery. */

break;

case POWER_SUPPLY_PROP_CAPACITY:

val->intval = 80;//chip->soc;

break;

case POWER_SUPPLY_PROP_TECHNOLOGY:

val->intval = POWER_SUPPLY_TECHNOLOGY_LION;

break;

case POWER_SUPPLY_PROP_HEALTH:

// if(chip->vcell < 2850)

// val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;

// else

val->intval = POWER_SUPPLY_HEALTH_GOOD;

break;

case POWER_SUPPLY_PROP_TEMP:

break;

default:

return -EINVAL;

}

return 0;

}

work_queue队列

static void work_max17040(struct work_struct *work)

{

int old_usb_online, old_online, old_vcell, old_soc;

int vol, level;

old_online = chip->online;

old_usb_online = chip->usb_online;

old_vcell = chip->vcell;

old_soc = chip->soc;

max17040_update_values();

vol = battary_vol_average();

printk("+++ %s: vol = %d \n", __func__, vol);

level = battary_level(vol);

dev_info(dev,"%s, level = %d \n", __func__, level);

// s3c_get_bat_level();

if((old_vcell != chip->vcell) || (old_soc != chip->soc))

power_supply_changed(&chip->battery);

if(old_usb_online != chip->usb_online)

power_supply_changed(&chip->usb);

if(old_online != chip->online)

power_supply_changed(&chip->ac);

power_supply_changed(&chip->ac); // 回调ac 中的get_property()

// for test

power_supply_changed(&chip->battery); // 回调battery中的get_property()

power_supply_changed(&chip->usb); // 回调usb中的get_property()

schedule_delayed_work(&chip->work, MAX17040_DELAY);

}

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