android sensors 总结(三)

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我是靠谱客的博主现代烤鸡，最近开发中收集的这篇文章主要介绍android sensors 总结(三)，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

3 sensor driver

相关结构体

//Sensor device 抽象

struct hwmdev_object {

structinput_dev *idev;

structmiscdevice mdev;

structdev_context *dc;

structwork_struct report;

atomic_t delay; /*polling period for reportinginput event*/

atomic_t wake; /*user-space request to wake-up, used withstop*/

structtimer_list timer; /* polling timer */

atomic_t trace;

uint32_t active_sensor; // Active, buthwmsen don't need data sensor. //Maybeother need it's data.

uint32_t active_data_sensor; // Active and hwmsen need datasensor.

//addfor fix resume issue

structearly_suspend early_drv;

structwake_lock read_data_wake_lock;

atomic_t early_suspend;

//addfor fix resume end

};

struct dev_context {

int polling_running;

struct mutex lock;

struct hwmsen_context* cxt[MAX_ANDROID_SENSOR_NUM+1];

};

struct hwmsen_context { /*sensor context*/

atomic_t enable;

atomic_tdelay;

uint32_tdelayCountSet;

uint32_tdelayCount;

structhwmsen_object obj;

};

/*------------sensorsdata----------------------------------------------------*/

typedef struct {

/*sensor identifier */

int sensor;

/*sensor values */

int values[3];

/*sensor values divide */

uint32_tvalue_divide;

/*sensor accuracy*/

int8_tstatus;

/*whether updata? */

int update;

/*time is in nanosecond */

int64_t time;

uint32_t reserved;

}hwm_sensor_data;

typedef struct {

hwm_sensor_datadata[MAX_ANDROID_SENSOR_NUM];

intdate_type;

}hwm_trans_data;

static int hwmsen_probe(structplatform_device *pdev)

{

interr;

//HWM_LOG("+++++++++++++++++hwmsen_probe!!n");

HWM_FUN(f);

init_static_data();

hwm_obj= hwmsen_alloc_object(); //alloc& init hwmsensor obj

if(!hwm_obj)

{

err= -ENOMEM;

HWM_ERR("unableto allocate devobj!n");

gotoexit_alloc_data_failed;

}

hwm_obj->idev= input_allocate_device(); //alloc inputdevice

if(!hwm_obj->idev)

{

err= -ENOMEM;

HWM_ERR("unableto allocate input device!n");

gotoexit_alloc_input_dev_failed;

}

set_bit(EV_REL,hwm_obj->idev->evbit);

set_bit(EV_SYN,hwm_obj->idev->evbit);

input_set_capability(hwm_obj->idev,EV_REL, EVENT_TYPE_SENSOR); ///setevent type

hwm_obj->idev->name= HWM_INPUTDEV_NAME;

if((err= input_register_device(hwm_obj->idev))) ///

{

HWM_ERR("unableto register input device!n");

gotoexit_input_register_device_failed;

}

input_set_drvdata(hwm_obj->idev,hwm_obj);

hwm_obj->mdev.minor= MISC_DYNAMIC_MINOR;

hwm_obj->mdev.name = HWM_SENSOR_DEV_NAME;

hwm_obj->mdev.fops = &hwmsen_fops;

if((err= misc_register(&hwm_obj->mdev))) //注册为一个杂项设备，提供ops

{

HWM_ERR("unableto register sensor device!!n");

gotoexit_misc_register_failed;

}

dev_set_drvdata(hwm_obj->mdev.this_device,hwm_obj);

//add for fix resume bug

atomic_set(&(hwm_obj->early_suspend), 0);

hwm_obj->early_drv.level = EARLY_SUSPEND_LEVEL_STOP_DRAWING - 1,

hwm_obj->early_drv.suspend = hwmsen_early_suspend,

hwm_obj->early_drv.resume = hwmsen_late_resume,

register_early_suspend(&hwm_obj->early_drv);

wake_lock_init(&(hwm_obj->read_data_wake_lock),WAKE_LOCK_SUSPEND,"read_data_wake_lock");

//add for fix resume bug end

return0;

exit_hwmsen_create_attr_failed:

exit_misc_register_failed:

// exit_get_hwmsen_info_failed:

exit_input_register_device_failed:

input_free_device(hwm_obj->idev);

exit_alloc_input_dev_failed:

kfree(hwm_obj);

exit_alloc_data_failed:

returnerr;

}

static void hwmsen_poll(unsigned long data)

{

structhwmdev_object *obj = (struct hwmdev_object *)data;

if(obj!= NULL)

{

queue_work(sensor_workqueue,&obj->report);

}

static struct hwmdev_object*hwmsen_alloc_object(void)

{

structhwmdev_object *obj = kzalloc(sizeof(*obj), GFP_KERNEL);

HWM_FUN(f);

if(!obj)

{

HWM_ERR("Allochwmsen object error!n");

returnNULL;

}

obj->dc= &dev_cxt;

obj->active_data_sensor= 0;

obj->active_sensor= 0;

atomic_set(&obj->delay,200); /*5Hz*/// set work queue delay time 200ms

atomic_set(&obj->wake,0);

sensor_workqueue= create_singlethread_workqueue("sensor_polling");

INIT_WORK(&obj->report,hwmsen_work_func);

init_timer(&obj->timer);

obj->timer.expires = jiffies + atomic_read(&obj->delay)/(1000/HZ);

obj->timer.function = hwmsen_poll;

obj->timer.data = (unsigned long)obj;

returnobj;

}

ioctrl 分析，只要提供ioctrl cmd给sensor hal

static long hwmsen_unlocked_ioctl(structfile *fp, unsigned int cmd, unsigned long arg)

{

//HWM_LOG("IOparament %d!rn", cmd);

void__user *argp = (void __user*)arg;

uint32_tflag;

structsensor_delay delayPara;

hwm_trans_datahwm_sensors_data;

inti = 0;

atomic_tdelaytemp;

atomic_set(&delaytemp,200);//used to finding fastest sensor polling rate

//intdelaytemp=200;//used to finding fastest sensor polling rate

if(!hwm_obj)

{

HWM_ERR("nullpointer!!n");

return-EINVAL;

}

switch(cmd)

{

caseHWM_IO_SET_DELAY:

// android2.3 sensor system has 4 sample delay0ms 20ms 60ms 200ms

if(copy_from_user(&delayPara,argp, sizeof(delayPara)))

{

HWM_ERR("copy_from_userfail!!n");

return-EFAULT;

}

HWM_LOG("ioctldelay handle=%d,delay =%dn",delayPara.handle,delayPara.delay);

hwmsen_set_delay(delayPara.delay,delayPara.handle);//modifiedfor android2.3

update_workqueue_polling_rate(delayPara.delay);

break;

caseHWM_IO_SET_WAKE:

hwmsen_wakeup(hwm_obj);

break;

caseHWM_IO_ENABLE_SENSOR: //打开相应的sensor，并poll sensor数据

if(copy_from_user(&flag,argp, sizeof(flag)))

{

HWM_ERR("copy_from_userfail!!n");

return-EFAULT;

}

hwmsen_enable(hwm_obj,flag, 1);

break;

caseHWM_IO_DISABLE_SENSOR: //关闭相应的sensor，flag 为sensor type

if(copy_from_user(&flag,argp, sizeof(flag)))

{

HWM_ERR("copy_from_userfail!!n");

return-EFAULT;

}

hwmsen_enable(hwm_obj,flag, 0);

break;

caseHWM_IO_GET_SENSORS_DATA: //获取sensorsdata

if(copy_from_user(&hwm_sensors_data,argp, sizeof(hwm_sensors_data)))

{

HWM_ERR("copy_from_userfail!!n");

return-EFAULT;

}

mutex_lock(&obj_data.lock);

memcpy(hwm_sensors_data.data,&(obj_data.sensors_data),sizeof(hwm_sensor_data) * MAX_ANDROID_SENSOR_NUM);

for(i= 0; i < MAX_ANDROID_SENSOR_NUM; i++)

{

if(hwm_sensors_data.date_type& 1<<i)

{

hwm_sensors_data.data[i].update= 1;

}

else

{

hwm_sensors_data.data[i].update= 0;

}

mutex_unlock(&obj_data.lock);

if(copy_to_user(argp,&hwm_sensors_data, sizeof(hwm_sensors_data)))

{

HWM_ERR("copy_to_userfail!!n");

return-EFAULT;

}

break;

caseHWM_IO_ENABLE_SENSOR_NODATA: //仅仅打开sensor

if(copy_from_user(&flag,argp, sizeof(flag)))

{

HWM_ERR("copy_from_userfail!!n");

return -EFAULT;

}

hwmsen_enable_nodata(hwm_obj,flag, 1);

break;

caseHWM_IO_DISABLE_SENSOR_NODATA:

if(copy_from_user(&flag,argp, sizeof(flag)))

{

HWM_ERR("copy_from_userfail!!n");

return-EFAULT;

}

hwmsen_enable_nodata(hwm_obj,flag, 0);

break;

default:

HWM_ERR("haveno this paramenter %d!!n", cmd);

return-ENOIOCTLCMD;

}

return0;

}

static int hwmsen_enable(structhwmdev_object *obj, int sensor, int enable)

{

structhwmsen_context *cxt = NULL;

interr = 0;

uint32_tsensor_type;

sensor_type= 1 << sensor;

if(!obj)

{

HWM_ERR("hwmdevobj pointer is NULL!n");

return-EINVAL;

}

elseif(obj->dc->cxt[sensor] == NULL)

{

HWM_ERR("thesensor (%d) is not attached!!n", sensor);

return-ENODEV;

}

mutex_lock(&obj->dc->lock);

cxt= obj->dc->cxt[sensor];

if(enable== 1)

{

enable_again= true;

obj->active_data_sensor|= sensor_type;

if((obj->active_sensor& sensor_type) == 0) // no no-data active

{

if(cxt->obj.sensor_operate(cxt->obj.self, SENSOR_ENABLE,&enable,sizeof(int), NULL, 0, NULL) != 0) //通过sensor type，打开特定sensor（accelerometor、proximity etc）

{

if(cxt->obj.sensor_operate(cxt->obj.self, SENSOR_ENABLE, &enable,sizeof(int),NULL, 0, NULL) != 0)

{

if(cxt->obj.sensor_operate(cxt->obj.self, SENSOR_ENABLE,&enable,sizeof(int), NULL, 0, NULL) != 0)

{

HWM_ERR("activatesensor(%d) 3 times err = %dn", sensor, err);

err= -EINVAL;

gotoexit;

}

atomic_set(&cxt->enable,1);

}

//Need to complete the interrupt sensor work

if((0== obj->dc->polling_running) && (obj->active_data_sensor !=0))

{

obj->dc->polling_running= 1;

//obj->timer.expires= jiffies + atomic_read(&obj->delay)/(1000/HZ);

//add_timer(&obj->timer);

mod_timer(&obj->timer,jiffies + atomic_read(&obj->delay)/(1000/HZ)); //启动poll timer

}

else

{

obj->active_data_sensor&= ~sensor_type;

if((obj->active_sensor& sensor_type) == 0) // no no-dataactive

{

if(cxt->obj.sensor_operate(cxt->obj.self,SENSOR_ENABLE, &enable,sizeof(int), NULL, 0, NULL) != 0)

{

HWM_ERR("deactivasensor(%d) err = %dn", sensor, err);

err= -EINVAL;

gotoexit;

}

atomic_set(&cxt->enable, 0);

update_workqueue_polling_rate(200);//re-update workqueue polling rate

}

if((1== obj->dc->polling_running) && (obj->active_data_sensor ==0))

{

obj->dc->polling_running= 0;

del_timer_sync(&obj->timer);

cancel_work_sync(&obj->report);

}

obj_data.sensors_data[sensor].values[0]= SENSOR_INVALID_VALUE;

obj_data.sensors_data[sensor].values[1]= SENSOR_INVALID_VALUE;

obj_data.sensors_data[sensor].values[2]= SENSOR_INVALID_VALUE;

}

HWM_LOG("sensor(%d),flag(%d)n", sensor, enable);

exit:

mutex_unlock(&obj->dc->lock);

returnerr;

}

hwmsen_enable 打开特定sensor后，启动polltimer，timer 时间到会调用hwmsen_poll 启动sensor_workqueue ，继而进入hwmsen_work_func 获取sensor data，并上报sensor type input 时间：

static void hwmsen_work_func(structwork_struct *work)

{

//structhwmdev_object *obj = container_of(work, struct hwmdev_object, report);

structhwmdev_object *obj = hwm_obj;

structhwmsen_context *cxt = NULL;

intout_size;

hwm_sensor_datasensor_data;

uint32_tevent_type = 0;

int64_t nt;

structtimespec time;

interr, idx;

//inttrc = atomic_read(&obj->trace);

if(obj == NULL)

{

HWM_ERR("objpoint is NULL!n");

return;

}

if(atomic_read(&obj->wake))

{

input_event(obj->idev,EV_SYN, SYN_CONFIG, 0);

atomic_set(&obj->wake,0);

return;

}

memset(&sensor_data,0, sizeof(sensor_data));

time.tv_sec= time.tv_nsec = 0;

time= get_monotonic_coarse();

nt= time.tv_sec*1000000000LL+time.tv_nsec;

//mutex_lock(&obj_data.lock);

for(idx= 0; idx < MAX_ANDROID_SENSOR_NUM; idx++)

{

cxt= obj->dc->cxt[idx];

if((cxt== NULL) || (cxt->obj.sensor_operate == NULL)

||!(obj->active_data_sensor&(0x01<<idx)))

{

continue;

}

//Interrupt sensor

if(cxt->obj.polling== 0)

{

if(obj_data.data_updata[idx]== 1)

{

mutex_lock(&obj_data.lock);

event_type|= (1 << idx);

obj_data.data_updata[idx]= 0;

mutex_unlock(&obj_data.lock);

}

continue;

}

//addedto surpport set delay to specified sensor

if(cxt->delayCount> 0)

{

//HWM_LOG("sensor(%d) delayCount =%dn",idx,cxt->delayCount);

cxt->delayCount--;

if(0 == cxt->delayCount)

{

cxt->delayCount = cxt->delayCountSet;

//HWM_LOG("sensor(%d)go to get datan",idx);

}

else

{

//HWM_LOG("sensor(%d) wait for nextworkn",idx);

continue;

}

err= cxt->obj.sensor_operate(cxt->obj.self,SENSOR_GET_DATA, NULL, 0,

&sensor_data,sizeof(hwm_sensor_data), &out_size);

if(err)

{

HWM_ERR("getdata from sensor (%d) fails!!n", idx);

continue;

}

else

{

if((idx== ID_LIGHT) ||(idx == ID_PRESSURE)

||(idx== ID_PROXIMITY) || (idx == ID_TEMPRERATURE))

{

//data changed, update the data

if(sensor_data.values[0]!= obj_data.sensors_data[idx].values[0])

{

mutex_lock(&obj_data.lock);

obj_data.sensors_data[idx].values[0]= sensor_data.values[0];

obj_data.sensors_data[idx].value_divide= sensor_data.value_divide;

obj_data.sensors_data[idx].status= sensor_data.status;

obj_data.sensors_data[idx].time= nt;

event_type|= (1 << idx);

mutex_unlock(&obj_data.lock);

//HWM_LOG("get%d sensor, values: %d!n", idx, sensor_data.values[0]);

}

Else

{

//data changed, update the data

if((sensor_data.values[0]!= obj_data.sensors_data[idx].values[0])

||(sensor_data.values[1] != obj_data.sensors_data[idx].values[1])

||(sensor_data.values[2] != obj_data.sensors_data[idx].values[2]))

{

if( 0 == sensor_data.values[0] &&0==sensor_data.values[1]

&&0 == sensor_data.values[2])

{

continue;

}

mutex_lock(&obj_data.lock);

obj_data.sensors_data[idx].values[0]= sensor_data.values[0];

obj_data.sensors_data[idx].values[1]= sensor_data.values[1];

obj_data.sensors_data[idx].values[2]= sensor_data.values[2];

obj_data.sensors_data[idx].value_divide= sensor_data.value_divide;

obj_data.sensors_data[idx].status= sensor_data.status;

obj_data.sensors_data[idx].time= nt;

event_type|= (1 << idx);

mutex_unlock(&obj_data.lock);

//HWM_LOG("get%d sensor, values: %d, %d, %d!n", idx,

//sensor_data.values[0],sensor_data.values[1], sensor_data.values[2]);

}

if(enable_again== true)

{

event_type= obj->active_data_sensor;

enable_again= false;

//filter-1 value

for(idx= 0; idx <= MAX_ANDROID_SENSOR_NUM; idx++)

{

if(ID_ACCELEROMETER==idx || ID_MAGNETIC==idx|| ID_ORIENTATION==idx

||ID_GYROSCOPE==idx || ID_TEMPRERATURE==idx

||ID_LINEAR_ACCELERATION==idx ||ID_ROTATION_VECTOR==idx

||ID_GRAVITY==idx)

{

if(SENSOR_INVALID_VALUE ==obj_data.sensors_data[idx].values[0] ||

SENSOR_INVALID_VALUE ==obj_data.sensors_data[idx].values[1] ||

SENSOR_INVALID_VALUE ==obj_data.sensors_data[idx].values[2])

{

event_type &= ~(1 << idx);

//HWM_LOG("idx=%d,obj->active_sensorafter clear: %dn",idx);

}

if(ID_PROXIMITY==idx || ID_LIGHT==idx ||ID_PRESSURE==idx)

{

if(SENSOR_INVALID_VALUE ==obj_data.sensors_data[idx].values[0])

{

event_type &= ~(1 << idx);

//HWM_LOG("idx=%d,obj->active_sensorafter clear: %dn",idx);

}

//HWM_LOG("eventtype after enable: %dn", event_type);

}

if((event_type&(1<< ID_PROXIMITY))&& SENSOR_INVALID_VALUE ==obj_data.sensors_data[ID_PROXIMITY].values[0])

{

event_type &= ~(1 <<ID_PROXIMITY);

//HWM_LOG("removeps event!!!!!!!!!!!n");

}

if(event_type!= 0)

{

input_report_rel(obj->idev,EVENT_TYPE_SENSOR, event_type);

input_sync(obj->idev);//modified

//HWM_LOG("eventtype: %dn", event_type);

}

else

{

//HWM_LOG("noavailable sensor!!n");

}

if(obj->dc->polling_running== 1)

{

mod_timer(&obj->timer,jiffies + atomic_read(&obj->delay)/(1000/HZ));

}

下面介绍几个hwmsen driver提供给特定physical sensor driver的接口：

/*Sensor device driver attach to hwmsendevice------------------------------------------------*/

int hwmsen_attach(int sensor, structhwmsen_object *obj)

{

structdev_context *mcxt = &dev_cxt;

interr = 0;

HWM_FUN(f);

if((mcxt== NULL) || (sensor > MAX_ANDROID_SENSOR_NUM))

{

err= -EINVAL;

gotoerr_exit;

}

mutex_lock(&mcxt->lock);

if(mcxt->cxt[sensor]!= NULL)

{

err= -EEXIST;

gotoerr_exit;

}

else

{

mcxt->cxt[sensor]= kzalloc(sizeof(struct hwmsen_context), GFP_KERNEL);

if(mcxt->cxt[sensor]== NULL)

{

err= -EPERM;

gotoerr_exit;

}

atomic_set(&mcxt->cxt[sensor]->enable,0);

memcpy(&mcxt->cxt[sensor]->obj,obj, sizeof(*obj));

// add for android2.3 set sensors default polling delay time is 200ms

atomic_set(&mcxt->cxt[sensor]->delay, 200);

}

err_exit:

mutex_unlock(&mcxt->lock);

returnerr;

}

int hwmsen_detach(int sensor)

{

interr = 0;

structdev_context *mcxt = &dev_cxt;

HWM_FUN(f);

if((sensor > MAX_ANDROID_SENSOR_NUM) || (mcxt->cxt[sensor] == NULL))

{

err= -EINVAL;

gotoerr_exit;

}

mutex_lock(&mcxt->lock);

kfree(mcxt->cxt[sensor]);

mcxt->cxt[sensor]= NULL;

err_exit:

mutex_unlock(&mcxt->lock);

return0;

}

//中断模式，获取sensors data接口

int hwmsen_get_interrupt_data(int sensor,hwm_sensor_data *data)

{

//HWM_LOG("++++++++++++++++++++++++++++hwmsen_get_interrupt_datafunction sensor = %dn",sensor);

structdev_context *mcxt = &dev_cxt;

structhwmdev_object *obj = hwm_obj;

int64_t nt;

structtimespec time;

if((sensor> MAX_ANDROID_SENSOR_NUM) || (mcxt->cxt[sensor] == NULL)

||(mcxt->cxt[sensor]->obj.polling != 0))

{

HWM_ERR("sensor%d!n", sensor);

return-EINVAL;

}

else

{

time.tv_sec= time.tv_nsec = 0;

time= get_monotonic_coarse();

nt= time.tv_sec*1000000000LL+time.tv_nsec;

if((sensor== ID_LIGHT) ||(sensor == ID_PRESSURE)

||(sensor== ID_PROXIMITY) || (sensor == ID_TEMPRERATURE))

{

//data changed, update the data

if(data->values[0]!= obj_data.sensors_data[sensor].values[0])

{

mutex_lock(&obj_data.lock);

obj_data.data_updata[sensor]= 1;

obj_data.sensors_data[sensor].values[0]= data->values[0];

obj_data.sensors_data[sensor].time= nt;

obj_data.sensors_data[sensor].value_divide= data->value_divide;

mutex_unlock(&obj_data.lock);

}

else

{

//data changed, update the data

if((data->values[0]!= obj_data.sensors_data[sensor].values[0])

||(data->values[1] != obj_data.sensors_data[sensor].values[1])

||(data->values[2] != obj_data.sensors_data[sensor].values[2]))

{

mutex_lock(&obj_data.lock);

obj_data.sensors_data[sensor].values[0]= data->values[0];

obj_data.sensors_data[sensor].values[1]= data->values[1];

obj_data.sensors_data[sensor].values[2]= data->values[2];

obj_data.sensors_data[sensor].value_divide= data->value_divide;

obj_data.data_updata[sensor]= 1;

obj_data.sensors_data[sensor].time= nt;

mutex_unlock(&obj_data.lock);

}

if(obj->dc->polling_running== 1)

{

hwmsen_work_func(NULL);

}

return0;

}

最后

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本文分类：sensor
浏览次数：80 次浏览
发布日期：2023-05-31 05:25:01
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android sensors 总结(三)

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