Hello everyone,
I bought this little USB device with Windows only support (using
usbser.sys - so pretty standard stuff I think). It connects through USB
and emulates a serial port. When I plug it in, the cdc_acm driver gets
loaded. However, the device doesn't work (as if it has no power). When I
unload cdc_acm and use usbserial (sudo modprobe usbserial vendor=0x04d8
product=0x000a) it does work.
I'd like the device to work with cdc_acm because I can not set the
serial baud rate using usbserial, and because my understanding is that
cdc_acm is a newer driver for the same functionality.
What can I do to get cdc_acm working with this device??
This is what I get from syslog when I insert the device (cdc_acm gets
loaded):
Apr 8 20:56:48 argon kernel: [ 8935.600089] usb 4-1: new full speed USB
device using uhci_hcd and address 12
Apr 8 20:56:48 argon kernel: [ 8935.761576] usb 4-1: configuration #1
chosen from 1 choice
Apr 8 20:56:49 argon kernel: [ 8936.354594] cdc_acm: This device cannot
do calls on its own. It is no modem.
Apr 8 20:56:49 argon kernel: [ 8936.355723] cdc_acm 4-1:1.0: ttyACM0:
USB ACM device
Apr 8 20:56:49 argon kernel: [ 8936.359019] usbcore: registered new
interface driver cdc_acm
Apr 8 20:56:49 argon kernel: [ 8936.360159] cdc_acm: v0.26:USB Abstract
Control Model driver for USB modems and ISDN adapters
Apr 8 20:56:49 argon NetworkManager: <debug> [1239217009.624247]
probe_modem(): Couldn't get caps
I then do the following:
- unplug the device
- unload cdc_acm
- blacklist cdc_acm
- replug the device
The device starts working. This is what I get from syslog:
Apr 8 21:01:46 argon kernel: [ 9232.952079] usb 4-1: new full speed USB
device using uhci_hcd and address 14
Apr 8 21:01:46 argon kernel: [ 9233.109605] usb 4-1: configuration #1
chosen from 1 choice
I only do not have a serial device yet, so I issue:
sudo modprobe usbserial vendor=0x04d8 product=0x000a
Then I get a /dev/ttyUSB0 and I can send commands. This is what syslog
shows:
Apr 8 21:03:08 argon kernel: [ 9315.302689] usbcore: registered new
interface driver usbserial
Apr 8 21:03:08 argon kernel: [ 9315.304050] usbserial: USB Serial
support registered for generic
Apr 8 21:03:08 argon kernel: [ 9315.305310] usbserial_generic 4-1:1.0:
Generic device with no bulk out, not allowed.
Apr 8 21:03:08 argon kernel: [ 9315.306778] usbserial_generic: probe of
4-1:1.0 failed with error -5
Apr 8 21:03:08 argon kernel: [ 9315.308100] usbserial_generic 4-1:1.1:
generic converter detected
Apr 8 21:03:08 argon kernel: [ 9315.309619] usb 4-1: generic converter
now attached to ttyUSB0
Apr 8 21:03:08 argon kernel: [ 9315.310808] usbcore: registered new
interface driver usbserial_generic
Apr 8 21:03:08 argon kernel: [ 9315.310819] usbserial: USB Serial
Driver core
/proc/bus/usb/devices does not exist, so I can not show you the output.
lsusb -vv gives the following:
Bus 004 Device 006: ID 04d8:000a Microchip Technology, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x04d8 Microchip Technology, Inc.
idProduct 0x000a
bcdDevice 1.00
iManufacturer 1 MDw
iProduct 2 MISCHAKA BOOT
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 67
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 300mA
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 0x02
line coding and serial state
CDC Union:
bMasterInterface 0
bSlaveInterface 1
CDC Call Management:
bmCapabilities 0x00
bDataInterface 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 250
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 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 250
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 250
Device Status: 0x0001
Self Powered
In case it's relevant, stty -a -F /dev/ttyUSB0 gives:
speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt
= ^R;
werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon
-ixoff
-iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0
vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
echoctl echoke
Thanks in advance for any help or pointers you can give me.
With kind regards,
Jurrie
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
