Prolific USB-to-Serial Comm Port LINUX DRIVER

Prolific technology USB serial driver Linux

When you connect USB (or serial to USB) to your Linux device and if it recognises the USB but A in a little different manner e.g usbdev1.XX and 

Not in the expected format like ttyUSB0 (ttyUSB1 , ttyUSB2 .....) . I am lising Out the the Steps which I have followed to Solve the problem.

First I checked What are the Devices are present in my dev directory by following command

# ls /dev/

and the response is as follows

usbdev1.1

usbdev1.2

usbdev1.3

usbdev1.4

usbdev1.5

ttyS0

ttyS1

ttyS2

ttyS3

Now I Give the Following command to Know the Devices specifications

# lsusb

The response is as follows 

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 001 Device 002: ID 1a40:0101 TERMINUS TECHNOLOGY INC. 

Bus 001 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port

Bus 001 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC

Bus 001 Device 005: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC

So I know which device I am looking for . The Device is "Bus 001 Device 010: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port"

and its 'usbdev1.3'

Now I Give the followin command to find if the PL2303 driver is present on my kernal or not

# find /lib/modules -name *2303*

this replys me 

/lib/modules/3.2.29-00165-gd626b6d/kernel/drivers/usb/serial/pl2303.ko

So the .ko file is present .Now All I need to do is to Initialise the pl2303.ko to recognize my USB as ttyUSB*

Give the following command to initialize the pl2303.ko 

# insmod /lib/modules/3.2.29-00165-gd626b6d/kernel/drivers/usb/serial/pl2303.ko

Now once again check fot the device 

# ls /dev/

and This time I gives me the response 

usbdev1.1

usbdev1.2

usbdev1.4

usbdev1.5

ttyS0

ttyS1

ttyS2

ttyS3

ttyUSB1

Now I can Use ttyUSB1 as normar USB .

I also created the bash file with the content 

 #!/bin/bash         

insmod /lib/modules/3.2.29-00165-gd626b6d/kernel/drivers/usb/serial/pl2303.ko

and put it into the /etc/profile.d/ folder with 'chmod a+x' privlages

-----------------------------------------------------------

Following Problem 

insmod: error inserting 'pl2303.ko'

insmod error -- Invalid module format

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map usbdev1.xx to ttyusb

As a side note, I went to the root file system, there is no /dev/ttyUSB anything...

There is /dev/usbdev1.1, /dev/usbdev1.2, etc...does this help??

usb1

usb2

usb3

usbdev1.1_epXX <-Several

usbdev1.2_epXX <-Several

usbdev2.1_epXX <- Several

usbdev3.1_epXX <- Several

Bus 003 Device 009: ID 1199:6880 Sierra Wireless, Inc.

Bus 003 Device 001: ID 1d6b:001

Bus 002 Device 001: ID 1d6b:001

Bus 003 Device 001: ID 1d6b:002

USB Serial Converter support

insmod: can't read 'usbserial': No such file or directory

insmod: error inserting 'usbserial.ko': 

insmod: Invalid module format

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modprobe  vendor=0x067b product=0x2303

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