Issue
I want to write an application to read data(iSerial info) from connected USB Hub to linux as well as connected other devices to that USB hub.
-> I want to first detect whether USB Hub Connected or Not to linux which I can identify using idVendor:idProduct
->if its connected I want to read its info then have to iterate trough all USB devices connected to that USB Hub and have to read that devices info too
I am using this USB Hub: https://www.cablematters.com/pc-873-126-usb-c-multiport-adapter-with-4k-hdmi-2x-usb-30-gigabit-ethernet-and-power-delivery.aspx which has 5 Port as follow:
1) USB-C for 80W laptop charging or 5Gbps data transfer
2) Gigabit Ethernet Network
3) 4K HDMI
4) USB 3.0
5) USB 3.0
Test1: Initial USB devices:
user@user:~$ sudo lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 009: ID 8087:0026 Intel Corp. AX201 Bluetooth
Bus 003 Device 006: ID 0c45:672e Microdia Integrated_Webcam_HD
Bus 003 Device 004: ID 27c6:63ac Shenzhen Goodix Technology Co.,Ltd. Goodix USB2.0 MISC
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
user@user:~$
Test2: After connecting USB Hub to PC:
-> Here when I connected USB HUB to PC why lsusb shows up these 4 USB devices for this one USB Hub
Bus 004 Device 027: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
Bus 004 Device 026: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 062: ID 2109:8817 VIA Labs, Inc. USB-C Multiport Adapter
Bus 003 Device 061: ID 2109:2817 VIA Labs, Inc. USB2.0 Hub
user@user:~$ sudo dmesg
[18985.773383] usb 3-3: new high-speed USB device number 61 using xhci_hcd
[18985.923960] usb 3-3: New USB device found, idVendor=2109, idProduct=2817, bcdDevice= 5.33
[18985.923971] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[18985.923975] usb 3-3: Product: USB2.0 Hub
[18985.923978] usb 3-3: Manufacturer: VIA Labs, Inc.
[18985.925703] hub 3-3:1.0: USB hub found
[18985.925886] hub 3-3:1.0: 5 ports detected
[18986.049724] usb 4-1: new SuperSpeed USB device number 26 using xhci_hcd
[18986.075263] usb 4-1: New USB device found, idVendor=2109, idProduct=0817, bcdDevice= 5.33
[18986.075266] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[18986.075267] usb 4-1: Product: USB3.0 Hub
[18986.075268] usb 4-1: Manufacturer: VIA Labs, Inc.
[18986.076329] hub 4-1:1.0: USB hub found
[18986.076441] hub 4-1:1.0: 4 ports detected
[18986.637428] usb 4-1.1: new SuperSpeed USB device number 27 using xhci_hcd
[18986.658315] usb 4-1.1: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=30.00
[18986.658318] usb 4-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=6
[18986.658319] usb 4-1.1: Product: USB 10/100/1000 LAN
[18986.658321] usb 4-1.1: Manufacturer: CMI
[18986.658321] usb 4-1.1: SerialNumber: 000001
[18986.745830] r8152-cfgselector 4-1.1: reset SuperSpeed USB device number 27 using xhci_hcd
[18986.793249] r8152 4-1.1:1.0: load rtl8153a-4 v2 02/07/20 successfully
[18986.826148] r8152 4-1.1:1.0 eth0: v1.12.13
[18986.856606] r8152 4-1.1:1.0 enx5c857e3d381a: renamed from eth0
[18990.785555] usb 3-3.5: new high-speed USB device number 62 using xhci_hcd
[18990.887055] usb 3-3.5: New USB device found, idVendor=2109, idProduct=8817, bcdDevice= 0.01
[18990.887067] usb 3-3.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[18990.887071] usb 3-3.5: Product: USB-C Multiport Adapter
[18990.887082] usb 3-3.5: Manufacturer: VIA Labs, Inc.
[18990.887089] usb 3-3.5: SerialNumber: 0000000000000001
user@user:~$
user@user:~$ sudo lsusb
Bus 004 Device 027: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
Bus 004 Device 026: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 062: ID 2109:8817 VIA Labs, Inc. USB-C Multiport Adapter
Bus 003 Device 061: ID 2109:2817 VIA Labs, Inc. USB2.0 Hub
Bus 003 Device 009: ID 8087:0026 Intel Corp. AX201 Bluetooth
Bus 003 Device 006: ID 0c45:672e Microdia Integrated_Webcam_HD
Bus 003 Device 004: ID 27c6:63ac Shenzhen Goodix Technology Co.,Ltd. Goodix USB2.0 MISC
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
user@user:~$
user@user:~$ sudo lsusb -tv
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 20000M/x2
ID 1d6b:0003 Linux Foundation 3.0 root hub
|__ Port 1: Dev 26, If 0, Class=Hub, Driver=hub/4p, 5000M
ID 2109:0817 VIA Labs, Inc.
|__ Port 1: Dev 27, If 0, Class=Vendor Specific Class, Driver=r8152, 5000M
ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
ID 1d6b:0002 Linux Foundation 2.0 root hub
|__ Port 3: Dev 61, If 0, Class=Hub, Driver=hub/5p, 480M
ID 2109:2817 VIA Labs, Inc.
|__ Port 5: Dev 62, If 0, Class=, Driver=, 480M
ID 2109:8817 VIA Labs, Inc.
|__ Port 10: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 12M
ID 27c6:63ac Shenzhen Goodix Technology Co.,Ltd.
|__ Port 11: Dev 6, If 0, Class=Video, Driver=uvcvideo, 480M
ID 0c45:672e Microdia
|__ Port 11: Dev 6, If 1, Class=Video, Driver=uvcvideo, 480M
ID 0c45:672e Microdia
|__ Port 11: Dev 6, If 2, Class=Video, Driver=uvcvideo, 480M
ID 0c45:672e Microdia
|__ Port 11: Dev 6, If 3, Class=Video, Driver=uvcvideo, 480M
ID 0c45:672e Microdia
|__ Port 14: Dev 9, If 0, Class=Wireless, Driver=btusb, 12M
ID 8087:0026 Intel Corp. AX201 Bluetooth
|__ Port 14: Dev 9, If 1, Class=Wireless, Driver=btusb, 12M
ID 8087:0026 Intel Corp. AX201 Bluetooth
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
ID 1d6b:0003 Linux Foundation 3.0 root hub
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
ID 1d6b:0002 Linux Foundation 2.0 root hub
user@user:~$
Test3: After connecting Wireless Keyboard and Mouse to USB Hub:
Wireless Mouse : Connected to one of the Port: USB 3.0 to this USB Hub
Wired Keyboard : Connected to one of the Port: USB 3.0 to this USB Hub
user@user:~$ sudo dmesg
[19065.514543] usb 3-3.2: new full-speed USB device number 63 using xhci_hcd
[19065.666592] usb 3-3.2: New USB device found, idVendor=046d, idProduct=c548, bcdDevice= 5.01
[19065.666604] usb 3-3.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[19065.666608] usb 3-3.2: Product: USB Receiver
[19065.666611] usb 3-3.2: Manufacturer: Logitech
[19065.675895] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3.2/3-3.2:1.0/0003:046D:C548.0052/input/input80
[19065.735155] hid-generic 0003:046D:C548.0052: input,hidraw1: USB HID v1.11 Keyboard [Logitech USB Receiver] on usb-0000:00:14.0-3.2/input0
[19065.736724] input: Logitech USB Receiver Mouse as /devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3.2/3-3.2:1.1/0003:046D:C548.0053/input/input81
[19065.736956] input: Logitech USB Receiver Consumer Control as /devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3.2/3-3.2:1.1/0003:046D:C548.0053/input/input82
[19065.794883] input: Logitech USB Receiver System Control as /devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3.2/3-3.2:1.1/0003:046D:C548.0053/input/input83
[19065.795488] hid-generic 0003:046D:C548.0053: input,hidraw2: USB HID v1.11 Mouse [Logitech USB Receiver] on usb-0000:00:14.0-3.2/input1
[19065.797179] hid-generic 0003:046D:C548.0054: hiddev0,hidraw3: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:14.0-3.2/input2
[19069.106472] usb 3-3.3: new full-speed USB device number 64 using xhci_hcd
[19069.258696] usb 3-3.3: New USB device found, idVendor=046d, idProduct=c52b, bcdDevice=12.11
[19069.258708] usb 3-3.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[19069.258712] usb 3-3.3: Product: USB Receiver
[19069.258716] usb 3-3.3: Manufacturer: Logitech
[19069.274724] logitech-djreceiver 0003:046D:C52B.0057: hiddev1,hidraw4: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:14.0-3.3/input2
[19069.405450] input: Logitech M510 as /devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3.3/3-3.3:1.2/0003:046D:C52B.0057/0003:046D:4051.0058/input/input84
[19069.405813] logitech-hidpp-device 0003:046D:4051.0058: input,hidraw5: USB HID v1.11 Mouse [Logitech M510] on usb-0000:00:14.0-3.3/input2:1
[19069.619234] logitech-hidpp-device 0003:046D:4051.0058: HID++ 4.5 device connected.
user@user:~$
user@user:~$ sudo lsusb
Bus 004 Device 027: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
Bus 004 Device 026: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 062: ID 2109:8817 VIA Labs, Inc. USB-C Multiport Adapter
Bus 003 Device 064: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 003 Device 063: ID 046d:c548 Logitech, Inc. USB Receiver
Bus 003 Device 061: ID 2109:2817 VIA Labs, Inc. USB2.0 Hub
Bus 003 Device 009: ID 8087:0026 Intel Corp. AX201 Bluetooth
Bus 003 Device 006: ID 0c45:672e Microdia Integrated_Webcam_HD
Bus 003 Device 004: ID 27c6:63ac Shenzhen Goodix Technology Co.,Ltd. Goodix USB2.0 MISC
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
user@user:~$
user@user:~$ sudo lsusb -tv
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 20000M/x2
ID 1d6b:0003 Linux Foundation 3.0 root hub
|__ Port 1: Dev 26, If 0, Class=Hub, Driver=hub/4p, 5000M
ID 2109:0817 VIA Labs, Inc.
|__ Port 1: Dev 27, If 0, Class=Vendor Specific Class, Driver=r8152, 5000M
ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
ID 1d6b:0002 Linux Foundation 2.0 root hub
|__ Port 3: Dev 61, If 0, Class=Hub, Driver=hub/5p, 480M
ID 2109:2817 VIA Labs, Inc.
|__ Port 5: Dev 62, If 0, Class=, Driver=, 480M
ID 2109:8817 VIA Labs, Inc.
|__ Port 3: Dev 64, If 1, Class=Human Interface Device, Driver=usbhid, 12M
ID 046d:c52b Logitech, Inc. Unifying Receiver
|__ Port 3: Dev 64, If 2, Class=Human Interface Device, Driver=usbhid, 12M
ID 046d:c52b Logitech, Inc. Unifying Receiver
|__ Port 3: Dev 64, If 0, Class=Human Interface Device, Driver=usbhid, 12M
ID 046d:c52b Logitech, Inc. Unifying Receiver
|__ Port 2: Dev 63, If 2, Class=Human Interface Device, Driver=usbhid, 12M
ID 046d:c548 Logitech, Inc.
|__ Port 2: Dev 63, If 0, Class=Human Interface Device, Driver=usbhid, 12M
ID 046d:c548 Logitech, Inc.
|__ Port 2: Dev 63, If 1, Class=Human Interface Device, Driver=usbhid, 12M
ID 046d:c548 Logitech, Inc.
|__ Port 10: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 12M
ID 27c6:63ac Shenzhen Goodix Technology Co.,Ltd.
|__ Port 11: Dev 6, If 0, Class=Video, Driver=uvcvideo, 480M
ID 0c45:672e Microdia
|__ Port 11: Dev 6, If 1, Class=Video, Driver=uvcvideo, 480M
ID 0c45:672e Microdia
|__ Port 11: Dev 6, If 2, Class=Video, Driver=uvcvideo, 480M
ID 0c45:672e Microdia
|__ Port 11: Dev 6, If 3, Class=Video, Driver=uvcvideo, 480M
ID 0c45:672e Microdia
|__ Port 14: Dev 9, If 0, Class=Wireless, Driver=btusb, 12M
ID 8087:0026 Intel Corp. AX201 Bluetooth
|__ Port 14: Dev 9, If 1, Class=Wireless, Driver=btusb, 12M
ID 8087:0026 Intel Corp. AX201 Bluetooth
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
ID 1d6b:0003 Linux Foundation 3.0 root hub
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
ID 1d6b:0002 Linux Foundation 2.0 root hub
user@user:~$
As when I connect USB Hub to PC I guess root device is this one
Bus 003 Device 062: ID 2109:8817 VIA Labs, Inc. USB-C Multiport Adapter
then how does I list all devices connected under this root node in this case its Wireless Keyboard and Mouse
sample code which I am using this one to list all USB devices: https://github.com/libusb/libusb/blob/master/examples/listdevs.c
However I am not sure how to determine Parent->Child relationship between listed all devices to perform following task:
- Want to detect root Hub device
- then based on this root hub device want to list all devices connected to this hub device (here its Mouse and Keyboard)
pseudo code:
/* get all usb device using this API */
libusb_get_device_list(NULL, &devs);
/* find child devices connected to root device*/
print_devs(devs);
static void print_devs(libusb_device **devs)
{
libusb_device *dev;
int i = 0, j = 0;
while ((dev = devs[i++]) != NULL) {
struct libusb_device_descriptor desc;
int r = libusb_get_device_descriptor(dev, &desc);
if (r < 0) {
fprintf(stderr, "failed to get device descriptor");
return;
}
if(desc.idVendor == rootDeviceidVendor && desc.idProduct == rootDevicepProduct){
/* want to list only devices connected to this hub device */
}
}
}
Solution
I remember doing this exact thing a couple of years ago, but I do not have the code at hand.
You have a very good start there, going through the list of devices; Then you need to call:
libusb_device *parent = libusb_get_parent(dev);
int r = libusb_get_device_descriptor(parent, &desc);
Now you can go ahead and check for proper desc.idVendor and desc.idProduct on this descriptor.
See spec of libusb_get_parent.
Answered By - saintMath Answer Checked By - Pedro (WPSolving Volunteer)