Research on Linux USB device load recognition

Keywords: Linux

Linux USB device load identification exploration. SD card is connected with 16GB and 32GB cards respectively. It can be seen that there is a sequence (from small to large) when starting to scan the usb bus.

Hardware connection

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ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
 before uhci_hcd and ohci_hcd, not after
hiusb-ehci hiusb-ehci.0: HIUSB EHCI
hiusb-ehci hiusb-ehci.0: new USB bus registered, assigned bus number 1
hiusb-ehci hiusb-ehci.0: irq 51, io mem 0x10040000
hiusb-ehci hiusb-ehci.0: USB 0.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected

ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
hiusb-ohci hiusb-ohci.0: HIUSB OHCI
hiusb-ohci hiusb-ohci.0: new USB bus registered, assigned bus number 2
hiusb-ohci hiusb-ohci.0: irq 50, io mem 0x10030000
ata1: SATA link down (SStatus 0 SControl 300)
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected

usbcore: registered new interface driver usb-storage
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver

usb 1-2: new high-speed USB device number 2 using hiusb-ehci
hub 1-2:1.0: USB hub found
hub 1-2:1.0: 4 ports detected

usb 1-2.2: new high-speed USB device number 3 using hiusb-ehci
usb-storage 1-2.2:1.0: USB Mass Storage device detected
scsi2 : usb-storage 1-2.2:1.0

usb 1-2.3: new high-speed USB device number 4 using hiusb-ehci
usb-storage 1-2.3:1.0: USB Mass Storage device detected
scsi3 : usb-storage 1-2.3:1.0

scsi 2:0:0:0: Direct-Access     Generic  MassStorageClass 2402 PQ: 0 ANSI: 6
sd 2:0:0:0: Attached scsi generic sg0 type 0
sd 2:0:0:0: [sda] 30253056 512-byte logical blocks: (15.4 GB/14.4 GiB)
sd 2:0:0:0: [sda] Write Protect is off
sd 2:0:0:0: [sda] Mode Sense: 21 00 00 00
sd 2:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
 sda: sda1
sd 2:0:0:0: [sda] Attached SCSI removable disk

scsi 3:0:0:0: Direct-Access     Generic  MassStorageClass 2402 PQ: 0 ANSI: 6
sd 3:0:0:0: Attached scsi generic sg1 type 0
sd 3:0:0:0: [sdb] 60456960 512-byte logical blocks: (30.9 GB/28.8 GiB)
sd 3:0:0:0: [sdb] Write Protect is off
sd 3:0:0:0: [sdb] Mode Sense: 21 00 00 00
sd 3:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
 sdb: sdb1
sd 3:0:0:0: [sdb] Attached SCSI removable disk

usb debugging information printing

mount -t debugfs none /sys/kernel/debug/

cat /sys/kernel/debug/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=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0001 Rev= 3.10
S:  Manufacturer=Linux 3.10.0 ohci_hcd
S:  Product=HIUSB OHCI
S:  SerialNumber=hiusb-ohci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 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

It can be seen that the driver supports the hub of USB1.1 downward, and the OHCI protocol has two ports.

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 2
B:  Alloc=  0/800 us ( 0%), #Int=  1, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 3.10
S:  Manufacturer=Linux 3.10.0 ehci_hcd
S:  Product=HIUSB EHCI
S:  SerialNumber=hiusb-ehci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 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=   4 Ivl=256ms

Above is the driver supporting the USB 2.0 version of the hub, which uses the EHCI protocol and has two ports.

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=02 MxPS=64 #Cfgs=  1
P:  Vendor=05e3 ProdID=0610 Rev=32.98
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=01 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   1 Ivl=256ms
I:* If#= 0 Alt= 1 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=02 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   1 Ivl=256ms

It can be seen that the above is an external USB2.0 hub, which is connected to a USB port from the internal hub of the chip, with four ports.

T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#=  3 Spd=480  MxCh= 0
D:  Ver= 2.01 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=05e3 ProdID=0761 Rev=24.02
S:  Product=USB Storage
S:  SerialNumber=000000002402
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

T:  Bus=01 Lev=02 Prnt=02 Port=02 Cnt=02 Dev#=  4 Spd=480  MxCh= 0
D:  Ver= 2.01 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=05e3 ProdID=0761 Rev=24.02
S:  Product=USB Storage
S:  SerialNumber=000000002402
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

It can be seen that there are two USB2.0 ports above.

~ # lsusb 
Bus 001 Device 002: ID 05e3:0610
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0001
Bus 001 Device 003: ID 05e3:0761
Bus 001 Device 004: ID 05e3:0761

What do you think of the information above? How does it correspond?

Posted by sith717 on Wed, 30 Oct 2019 07:35:51 -0700

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Research on Linux USB device load recognition

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usb debugging information printing

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