Linux下HID 设备.docx
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Linux下HID设备
Linux下HID设备，如果非标准的输入设备（Keypad/MOUSE/JoyStick/inputeventdevice）.
将会把信息转入hiddevice的设备结点。
这一点可以参见内核的关于hiddev的文档
http:
//lxr.free-
它在Documentation/usb/hiddev.txt目录下，大致有这样一个流程，
usb.c--->hid-core.c---->hid-input.c---->[keyboard/mouse/joystick/event]
|
|
-->hiddev.c---->POWER/MONITORCONTROL
关于操作非标准的HID设备，可以参见如下文档.
在设备文件系统中，会产生的/dev/hiddev0这样的结点，这类设备主设备号为180,从设备号最低为96
Cat/proc/device|grephiddev
mknod/dev/hiddev0c18096
mknod/dev/hiddev1c18097
mknod/dev/hiddev2c18098
mknod/dev/hiddev3c18099
...
mknod/dev/hiddev15c180111
对此设备结点的处理有两种接口，一种是read（）,另一种是ioctl（）；
∙read（）:
Thisistheeventinterface.WhentheHIDdeviceperformsaninterrupttransfer,indicatingachangeofstate,datawillbemadeavailableattheassociatedhiddevdevicewiththecontentofastructhiddev_event:
structhiddev_event{unsignedhid;signedintvalue;};containingtheHIDusageidentifierforthestatusthatchanged,andthevaluethatitwaschangedto.
∙ioctl（）:
Thisisthecontrolinterface.Thereareanumberofcontrols:
HIDIOCGVERSION
int（read）
Getstheversioncodeoutofthehiddevdriver.
HIDIOCAPPLICATION
（none）
ThisioctlcallreturnstheHIDapplicationusageassociatedwiththehiddevice.Thethirdargumenttoioctl（）specifieswhichapplicationindextoget.Thisisusefulwhenthedevicehasmorethanoneapplicationcollection.Iftheindexisinvalid（greaterorequaltothenumberofapplicationcollectionsthisdevicehas）theioctlreturns-1.Youcanfindoutbeforehandhowmanyapplicationcollectionsthedevicehasfromthenum_applicationsfieldfromthehiddev_devinfostructure.
HIDIOCGDEVINFO
structhiddev_devinfo（read）
Getsahiddev_devinfostructurewhichdescribesthedevice.
HIDIOCGSTRING
structstructhiddev_string_descriptor（read/write）
Getsastringdescriptorfromthedevice.Thecallermustfillinthe"index"fieldtoindicatewhichdescriptorshouldbereturned.
HIDIOCINITREPORT
Instructsthekerneltoretrieveallinputandfeaturereportvaluesfromthedevice.Atthispoint,alltheusagestructureswillcontaincurrentvaluesforthedevice,andwillmaintainitasthedevicechanges.
HIDIOCGNAME
string（variablelength）
Getsthedevicename
HIDIOCGREPORT
structhiddev_report_info（write）
Instructsthekerneltogetafeatureorinputreportfromthedevice,inordertoselectivelyupdatetheusagestructures（incontrasttoINITREPORT）.
HIDIOCSREPORT
structhiddev_report_info（write）
Instructsthekerneltosendareporttothedevice.ThisreportcanbefilledinbytheuserthroughHIDIOCSUSAGEcalls（below）tofillinindividualusagevaluesinthereportbeforesendingthereportinfulltothedevice.
HIDIOCGREPORTINFO
structhiddev_report_info（read/write）
Fillsinahiddev_report_infostructurefortheuser.Thereportislookedupbytype（input,outputorfeature）andid,sothesefieldsmustbefilledinbytheuser.TheIDcanbeabsolute--theactualreportidasreportedbythedevice--orrelative--HID_REPORT_ID_FIRSTforthefirstreport,and（HID_REPORT_ID_NEXT|report_id）forthenextreportafterreport_id.Withouta-prioriinformationaboutreportids,therightwaytousethisioctlistousetherelativeIDsabovetoenumeratethevalidIDs.Theioctlreturnsnon-zerowhenthereisnomorenextID.TherealreportIDisfilledintothereturnedhiddev_report_infostructure.
HIDIOCGFIELDINFO
structhiddev_field_info（read/write）
Returnsthefieldinformationassociatedwithareportinahiddev_field_infostructure.Theusermustfillinreport_idandreport_typeinthisstructure,asabove.Thefield_indexshouldalsobefilledin,whichshouldbeanumberfrom0andmaxfield-1,asreturnedfromapreviousHIDIOCGREPORTINFOcall.
HIDIOCGUCODE
structhiddev_usage_ref（read/write）
Returnstheusage_codeinahiddev_usage_refstructure,giventhatgivenitsreporttype,reportid,fieldindex,andindexwithinthefieldhavealreadybeenfilledintothestructure.
HIDIOCGUSAGE
structhiddev_usage_ref（read/write）
Returnsthevalueofausageinahiddev_usage_refstructure.Theusagetoberetrievedcanbespecifiedasabove,ortheusercanchoosetofillinthereport_typefieldandspecifythereport_idasHID_REPORT_ID_UNKNOWN.Inthiscase,thehiddev_usage_refwillbefilledinwiththereportandfieldinfomationassociatedwiththisusageifitisfound.
HIDIOCSUSAGE
structhiddev_usage_ref（write）
Setsthevalueofausageinanoutputreport.
1测试代码/*
2Author:
AndrewHuang
3<>
4http:
//lxr.free-
5
6*/
7#include
8#include
9#include
10#include
11#include
12#include
13#include
14#include
15#include
16
17staticvoidshowReports（intfd,unsignedreport_type）;
18staticvoidshow_all_report（intfd）;
19staticintread_event（intfd）;
20
21intmain（）
22{
23chardev_name[64]="/dev/hiddev0";
24intfd=-1;
25intversion;
26charname[100];
27structhiddev_devinfodinfo;
28
29
30fd=open（dev_name,O_RDWR）;
31if（fd==-1）
32{
33fprintf（stderr,"open%sfailure\n",dev_name）;
34return-1;
35}
36
37
38printf（"%sinfor\n",dev_name）;
39
40if（ioctl（fd,HIDIOCGVERSION,&version）<0）
41perror（"HIDIOCGVERSION"）;
42else
43{
44printf（"HIDIOCGVERSION:
%d.%d\n",（version>>16）&0xFFFF,version&0xFFFF）;
45if（version!
=HID_VERSION）
46printf（"WARNING:
versiondoesnotmatchcompile-timeversion\n"）;
47}
48
49if（ioctl（fd,HIDIOCGDEVINFO,&dinfo）<0）
50perror（"HIDIOCGDEVINFO"）;
51else
52{
53printf（"HIDIOCGDEVINFO:
bustype=%dbusnum=%ddevnum=%difnum=%d\n"
54"\tvendor=0x%04hxproduct=0x%04hxversion=0x%04hx\n"
55"\tnum_applications=%d\n",
56dinfo.bustype,dinfo.busnum,dinfo.devnum,dinfo.ifnum,
57dinfo.vendor,dinfo.product,dinfo.version,dinfo.num_applications）;
58}
59
60if（ioctl（fd,HIDIOCGNAME（99）,name）<0）
61perror（"HIDIOCGNAME"）;
62else
63{
64name[99]=0;
65printf（"HIDIOCGNAME:
%s\n",name）;
66}
67
68#if0
69printf（"\n***INPUT:
\n"）;showReports（fd,HID_REPORT_TYPE_INPUT）;
70printf（"\n***OUTPUT:
\n"）;showReports（fd,HID_REPORT_TYPE_OUTPUT）;
71printf（"\n***FEATURE:
\n"）;showReports（fd,HID_REPORT_TYPE_FEATURE）;
72#endif
73show_all_report（fd）;
74
75read_event（fd）;
76
77close（fd）;
78
79
80
81}
82
83
84
85
86staticvoidshowReports（intfd,unsignedreport_type）
87{
88structhiddev_report_inforinfo;
89structhiddev_field_infofinfo;
90structhiddev_usage_refuref;
91inti,j,ret;
92
93rinfo.report_type=report_type;
94rinfo.report_id=HID_REPORT_ID_FIRST;
95ret=ioctl（fd,HIDIOCGREPORTINFO,&rinfo）;
96while（ret>=0）
97{
98printf（"HIDIOCGREPORTINFO:
report_id=0x%X（%ufields）\n",
99rinfo.report_id,rinfo.num_fields）;
100for（i=0;i101{
102finfo.report_type=rinfo.report_type;
103finfo.report_id=rinfo.report_id;
104finfo.field_index=i;
105ioctl（fd,HIDIOCGFIELDINFO,&finfo）;
106
107printf（"HIDIOCGFIELDINFO:
field_index=%umaxusage=%uflags=0x%X\n"
108"\tphysical=0x%Xlogical=0x%Xapplication=0x%X\n"
109"\tlogical_minimum=%d,maximum=%dphysical_minimum=%d,maximum=%d\n",
110finfo.field_index,finfo.maxusage,finfo.flags,
111finfo.physical,finfo.logical,finfo.application,
112finfo.logical_minimum,finfo.logical_maximum,
113finfo.physical_minimum,finfo.physical_maximum）;
114
115for（j=0;j116{
117uref.report_type=finfo.report_type;
118uref.report_id=finfo.report_id;
119uref.field_index=i;
120uref.usage_index=j;
121ioctl（fd,HIDIOCGUCODE,&uref）;
122ioctl（fd,HIDIOCGUSAGE,&uref）;
123
124printf（">>usage_index=%uusage_code=0x%X（）value=%d\n",
125uref.usage_index,
126uref.usage_code,
127//controlName（uref.usage_code）,
128uref.value）;
129
130}
131}
132printf（"\n"）;
133
134rinfo.report_id|=HID_REPORT_ID_NEXT;
135ret=ioctl（fd,HIDIOCGREPORTINFO,&rinfo）;
136}
137}
138
139
140voidshow_all_report（intfd）
141{
142
143structhiddev_report_inforinfo;
144structhiddev_field_infofinfo;
145structhiddev_usage_refuref;
146intrtype,i,j;
147char*rtype_str;
148
149for（rtype=HID_REPORT_TYPE_MIN;rtype<=HID_REPORT_TYPE_MAX;
150rtype++）{
151switch（rtype）{
152caseHID_REPORT_TYPE_INPUT:
rtype_str="Input";break;
153caseHID_REPORT_TYPE_OUTPUT:
rtype_str="Output";break;
154caseHID_REPORT_TYPE_FEATURE:
rtype_str="Feature";break;
155default:
rtype_str="Unknown";break;
156}
157fprintf（stdout,"Reportsoftype%s（%d）:
\n",rtype_str,rtype）;
158rinfo.report_type=rtype;
159rinfo.report_id=HID_REPORT_ID_FIRST;
160while（ioctl（fd,HIDIOCGREPORTINFO,&rinfo）>=0）{
161fprintf（stdout,"Reportid:
%d（%dfields）\n",
162rinfo.report_id,rinfo.num_fields）;
163for（i=0;i164memset（&finfo,0,sizeof（finfo））;
165finfo.report_type=rinfo.report_type;
166finfo.report_id=rinfo.report_id;
167finfo.field_index=i;
168ioctl（fd,HIDIOCGFIELDINFO,&finfo）;
169fprintf（stdout,"Field:
%d:
app:
%04xphys%04x"
170"flags%x（%dusages）unit%xexp%d\n",
171i,finfo.application,finfo.physical,finfo.flags,
172finfo.maxusage,finfo.unit,finfo.unit_exponent）;
173memset（&uref,0,sizeof（uref））;
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