什麼是USB 裝置檔案系統 (USB Device File System):
USB 裝置檔案系統是一個虛擬的檔案系統，其目的是讓使用者能夠查詢到USB BUS上所有裝置的相關資訊
當USB Device System被掛載後，它會在掛載的目錄下出現一個devices的檔案
該檔案會列舉出所有連接到USB Bus上所有裝置，與其詳細的內容(如裝置類別, 組態設定, 介面, 設定, 端點...等相關資訊)
開啟核心的USB Device File System支援:
make menuconfig
Device Drivers --->
[*] USB support --->
*** Miscellaneous USB options ***
[*] USB device filesystem (DEPRECATED)
掛載USB Device File System
mount -t usbfs none /proc/bus/usb
查詢USB Bus上所有裝置的資訊:
cat /proc/bus/usb/devices
執行範例:
#cat /proc/bus/usb/devices
T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Product=OHCI Host Controller
S: SerialNumber=ohci_hcd
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
*************************************************************************
this device is a USB 1.1 OHCI Host Controller and it has only one interface and one configuration
Speed: 12 Mbps
Interface 0 has 1 alternate setting // driver : N/A
for setting 0: there is one Interrupt endpoint exost
//---------------------------------------------------------------------
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 2
B: Alloc= 2/800 us ( 0%), #Int= 2, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Product=EHCI Host Controller
S: SerialNumber=ehci_hcd
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=256ms
*************************************************************************
this device is a USB 2.0 Host Controller and it has only one interface and one configuration
Speed: 480 Mbps
Interface 0 has 1 alternate setting // driver : N/A
for setting 0: there is one Interrupt endpoint exost
//---------------------------------------------------------------------
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=480 MxCh= 4
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=05e3 ProdID=0608 Rev=77.61
S: Product=USB2.0 Hub
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=256ms
*************************************************************************
this device is a USB 2.0 HUB and it has only one interface and one configuration
Speed: 480 Mbps
Interface 0 has 1 alternate setting // driver : N/A
for setting 0: there is one Interrupt endpoint exost
//---------------------------------------------------------------------
T: Bus=01 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#= 3 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=ef(unk. ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=0408 ProdID=1030 Rev=21.14
S: Product=QCV103
S: SerialNumber=1802A
C:* #Ifs= 3 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=0e(unk. ) Sub=01 Prot=00 Driver=uvcvideo
E: Ad=81(I) Atr=03(Int.) MxPS= 32 Ivl=4ms
I: If#= 1 Alt= 0 #EPs= 0 Cls=0e(unk. ) Sub=02 Prot=00 Driver=uvcvideo
I: If#= 1 Alt= 1 #EPs= 1 Cls=0e(unk. ) Sub=02 Prot=00 Driver=uvcvideo
E: Ad=82(I) Atr=05(Isoc) MxPS=3072 Ivl=125us
I: If#= 1 Alt= 2 #EPs= 1 Cls=0e(unk. ) Sub=02 Prot=00 Driver=uvcvideo
E: Ad=82(I) Atr=05(Isoc) MxPS=2280 Ivl=125us
I: If#= 1 Alt= 3 #EPs= 1 Cls=0e(unk. ) Sub=02 Prot=00 Driver=uvcvideo
E: Ad=82(I) Atr=05(Isoc) MxPS=1024 Ivl=125us
I: If#= 1 Alt= 4 #EPs= 1 Cls=0e(unk. ) Sub=02 Prot=00 Driver=uvcvideo
E: Ad=82(I) Atr=05(Isoc) MxPS= 512 Ivl=125us
I: If#= 2 Alt= 0 #EPs= 0 Cls=0e(unk. ) Sub=02 Prot=00 Driver=(none)
I: If#= 2 Alt= 1 #EPs= 1 Cls=0e(unk. ) Sub=02 Prot=00 Driver=(none)
E: Ad=83(I) Atr=05(Isoc) MxPS= 792 Ivl=125us
I: If#= 2 Alt= 2 #EPs= 1 Cls=0e(unk. ) Sub=02 Prot=00 Driver=(none)
E: Ad=83(I) Atr=05(Isoc) MxPS= 256 Ivl=125us
*************************************************************************
this device has 3 Interface and 1 configutation
Interface 0 has 1 alternate setting // driver : uvc video
for setting 0: there is one Interrupt endpoint exost
Interface 1 has 2 alternate settings // driver : uvc video
for setting 0: there is no any endpoint
for setting 1: there is one Isochronous endpoint exist.
for setting 2: there is one Isochronous endpoint exist.
for setting 3: there is one Isochronous endpoint exist.
for setting 4: there is one Isochronous endpoint exist.
for setting 5: there is one Isochronous endpoint exist.
Interface 3 has 2 alternate settings
for setting 0: there is no any endpoint
for setting 1: there is one Isochronous endpoint exist.
//---------------------------------------------------------------------
T: Bus=01 Lev=02 Prnt=02 Port=03 Cnt=02 Dev#= 4 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=16 #Cfgs= 1
P: Vendor=0d8c ProdID=0130 Rev= 1.00
S: Product=USB PnP Audio Device
C:* #Ifs= 3 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=(none)
I: If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=(none)
I: If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=(none)
E: Ad=82(I) Atr=05(Isoc) MxPS= 200 Ivl=1ms
I: If#= 2 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=(none)
E: Ad=87(I) Atr=03(Int.) MxPS= 16 Ivl=1ms
*************************************************************************
this device has 3 Interface and 1 configutation
Interface 0 is a audio class device and it has 1 alternate setting,
for setting 0: there is no Interrupt endpoint exist
Interface 1 is a audio class device and it has 2 alternate settings,
for setting 0: there is no any endpoint
for setting 1: there is one Isochronous endpoint exist.
Interface 2 is a Human Interface device (HID) and it has 1 alternate setting
for setting 0: there is one Interrupt endpoint
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