Discussion:
HP switch USB serial console
(too old to reply)
Andreas Sundstrom
2014-10-22 11:17:44 UTC
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Raw Message
Some newer switch models from HP has a usb2serial port in them.
I just got to try one out and it sort of works with the generic
usbserial driver.

The problem I am seeing is that it always use 9600 bps, even if I
specify 115200 or 19200.

Is it possible to troubleshoot this in any way, I can test patches if
needed.
This is on a vanilla 3.17.1 kernel.

Here are the details:
modprobe usbserial vendor=0x3f0 product=0x13f

[ 188.018495] usbcore: registered new interface driver usbserial
[ 188.018522] usbcore: registered new interface driver usbserial_generic
[ 188.018547] usbserial: USB Serial support registered for generic
[ 188.018575] usbserial_generic 3-2:1.0: Generic device with no bulk
out, not allowed.
[ 188.018591] usbserial_generic: probe of 3-2:1.0 failed with error -5
[ 188.018607] usbserial_generic 3-2:1.1: The "generic" usb-serial
driver is only for testing and one-off prototypes.
[ 188.018612] usbserial_generic 3-2:1.1: Tell linux-usb-***@public.gmane.org
to add your device to a proper driver.
[ 188.018617] usbserial_generic 3-2:1.1: generic converter detected
[ 188.018828] usb 3-2: generic converter now attached to ttyUSB0

***@computer:/tmp# lsusb -vvv -d 03f0:013f

Bus 003 Device 003: ID 03f0:013f Hewlett-Packard
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x03f0 Hewlett-Packard
idProduct 0x013f
bcdDevice 0.01
iManufacturer 1 HP
iProduct 2 HPN Serial Port
iSerial 3 A7735230001
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 75
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x20
(Missing must-be-set bit!)
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 2 Communications
bFunctionSubClass 2 Abstract (modem)
bFunctionProtocol 0 None
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 0
CDC Header:
bcdCDC 1.10
CDC ACM:
bmCapabilities 0x06
sends break
line coding and serial state
CDC Union:
bMasterInterface 0
bSlaveInterface 1
CDC Call Management:
bmCapabilities 0x01
call management
bDataInterface 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 2
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)


Thanks for any help
/Andreas
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Johan Hovold
2014-10-22 13:00:02 UTC
Permalink
Raw Message
Post by Andreas Sundstrom
Some newer switch models from HP has a usb2serial port in them.
I just got to try one out and it sort of works with the generic
usbserial driver.
The problem I am seeing is that it always use 9600 bps, even if I
specify 115200 or 19200.
Is it possible to troubleshoot this in any way, I can test patches if
needed.
This is on a vanilla 3.17.1 kernel.
modprobe usbserial vendor=0x3f0 product=0x13f
[ 188.018495] usbcore: registered new interface driver usbserial
[ 188.018522] usbcore: registered new interface driver usbserial_generic
[ 188.018547] usbserial: USB Serial support registered for generic
[ 188.018575] usbserial_generic 3-2:1.0: Generic device with no bulk
out, not allowed.
[ 188.018591] usbserial_generic: probe of 3-2:1.0 failed with error -5
[ 188.018607] usbserial_generic 3-2:1.1: The "generic" usb-serial
driver is only for testing and one-off prototypes.
to add your device to a proper driver.
[ 188.018617] usbserial_generic 3-2:1.1: generic converter detected
[ 188.018828] usb 3-2: generic converter now attached to ttyUSB0
Bus 003 Device 003: ID 03f0:013f Hewlett-Packard
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x03f0 Hewlett-Packard
idProduct 0x013f
bcdDevice 0.01
iManufacturer 1 HP
iProduct 2 HPN Serial Port
iSerial 3 A7735230001
bNumConfigurations 1
bLength 9
bDescriptorType 2
wTotalLength 75
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x20
(Missing must-be-set bit!)
(Bus Powered)
Remote Wakeup
MaxPower 100mA
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 2 Communications
bFunctionSubClass 2 Abstract (modem)
bFunctionProtocol 0 None
iFunction 0
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 0
bcdCDC 1.10
bmCapabilities 0x06
sends break
line coding and serial state
bMasterInterface 0
bSlaveInterface 1
bmCapabilities 0x01
call management
bDataInterface 1
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 2
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)
Looks like this one should be handled by the cdc-acm driver, but the
device class (Misc) prevents it from being recognised.

Can you try forcing it to bind through sysfs?

echo 03f0 013f >/sys/bus/usb/drivers/cdc_acm/new_id

Thanks,
Johan
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Andreas Sundstrom
2014-10-22 14:13:36 UTC
Permalink
Raw Message
Post by Andreas Sundstrom
Some newer switch models from HP has a usb2serial port in them.
I just got to try one out and it sort of works with the generic
usbserial driver.
The problem I am seeing is that it always use 9600 bps, even if I
specify 115200 or 19200.
Is it possible to troubleshoot this in any way, I can test patches if
needed.
This is on a vanilla 3.17.1 kernel.
modprobe usbserial vendor=0x3f0 product=0x13f
[...]
Looks like this one should be handled by the cdc-acm driver, but the
device class (Misc) prevents it from being recognised.
Can you try forcing it to bind through sysfs?
echo 03f0 013f >/sys/bus/usb/drivers/cdc_acm/new_id
Thanks,
Johan
I don't know how it works, but after I compiled the cdc_acm driver it is
being loaded automatically when the USB port is plugged in.
And it looks like it's working as it should.

Thanks for the help
/Andreas
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Johan Hovold
2014-10-22 14:19:16 UTC
Permalink
Raw Message
Post by Andreas Sundstrom
Post by Andreas Sundstrom
Some newer switch models from HP has a usb2serial port in them.
I just got to try one out and it sort of works with the generic
usbserial driver.
The problem I am seeing is that it always use 9600 bps, even if I
specify 115200 or 19200.
Is it possible to troubleshoot this in any way, I can test patches if
needed.
This is on a vanilla 3.17.1 kernel.
modprobe usbserial vendor=0x3f0 product=0x13f
[...]
Looks like this one should be handled by the cdc-acm driver, but the
device class (Misc) prevents it from being recognised.
Can you try forcing it to bind through sysfs?
echo 03f0 013f >/sys/bus/usb/drivers/cdc_acm/new_id
I don't know how it works, but after I compiled the cdc_acm driver it is
being loaded automatically when the USB port is plugged in.
And it looks like it's working as it should.
Even better. The driver is matching on the interface (as it should).
Post by Andreas Sundstrom
Thanks for the help
You're welcome.

Johan
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