How to build the g_printer gadget in the kernel?

yuri exi

Intellectual 865 points

Hi,

My board is am335x-evm, SDK is ti-processor-sdk-linux-am335x-evm-02.00.02.11.

I used well g_printer (usb device mode) driver.

Method of g_printer that I have used is the module type(configfs.ko,libcomposite.ko,g_printer.ko).

I want to built in the usb device (configfs, libcomposite ,g_printer) to the kernel.

I checked these wiki pages:

http://processors.wiki.ti.com/index.php/UsbgeneralpageLinuxCore

http://processors.wiki.ti.com/index.php/Linux_Core_MUSB_User's_Guide

but I can't find any method for built in the usb device to the kernel.

I changed kernel menuconfig as below.

I don't know next step.

Do I have to use "insmod" after kernel menuconfig setting?

How can I do it?

thank you for supporting me all the time

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

This has been forwarded to the software team. They will respond here.

0 Yordan Kovachev over 9 years ago

TI__Guru**** 161600 points

Hi,

1. The menuconfig settings you've done are correct. After you do the modifications in menuconfig, you need to save them & exit. Then check the .config file for:
CONFIG_USB_LIBCOMPOSITE=y
CONFIG_USB_G_PRINTER=y
Rebuild the kernel & flash it on your board.

2. If you use the prebuilt images on the am335x-evm, then you have the G_PRINTER built as a module (but you have to insmod it), you just need to boot your board, and exectue the bellow steps on the evm:
cd /lib/modules/4.4.12-g3639bea54a/kernel/drivers/usb/gadget
modprobe libcomposite // or insmod libcomposite.ko
cd legacy
modprobe g_printer // or insmod g_printer.ko

3. The other option is to add those manually to arch/arm/configs/tisdk_am335x-evm_defconfig :

CONFIG_USB_LIBCOMPOSITE=y
CONFIG_USB_G_PRINTER=y

By default these are set as m, change them to y in order to have those drivers built in the kernel image.

Then rebuild the kenrel:
cd ~/ti-processor-sdk-linux-am335x-evm-03.00.00.04/
make linux
And flash your board with the newly built kernel image.

Best Regards,
Yordan

0 yuri exi over 9 years ago in reply to Yordan Kovachev

Intellectual 865 points

I tried to your advice

After I did the modifications in menuconfig, save menuconfig and exit.

I checked the .config file

and rebuild the kernel and flash it on my board.

but g_printer doesn't work.

===============================================
printer gadget: printer ready
printer gadget: high-speed config #1: printer
printer gadget:g interface 0
===============================================

I can't find any printer gadget message in the booting kernel message.

Is there a more modifications?

how to run(up) g_printer,after I do the modifications in menuconfig.

thank you for your advice.

0 Yordan Kovachev over 9 years ago in reply to yuri exi

TI__Guru**** 161600 points

Hi,
Sorry for the late reply.

The g_printer seems to be a legacy driver, and may need modifications in order to work with 4.1 kernel.

1. Can you run lsmod and share the output? Do you see g_printer anywhere?
2. Is it possible to use the equivalent function driver: usb_f_printer?

Best Regards,
Yordan

0 yuri exi over 9 years ago in reply to Yordan Kovachev

Intellectual 865 points

HI, Yordan Kovachev

1. Can you run lsmod and share the output? Do you see g_printer anywhere?

1) source position

linux-4.1.18+gitAUTOINC+bbe8cfc1da-gbbe8cfc/fs/configfs/configfs.ko

linux-4.1.18+gitAUTOINC+bbe8cfc1da-gbbe8cfc/drivers/usb/gadget/libcomposite.ko

linux-4.1.18+gitAUTOINC+bbe8cfc1da-gbbe8cfc/drivers/usb/gadget/legacy/g_printer.ko

2) run lsmod output

3) g_printer position (/dev/)

2. Is it possible to use the equivalent function driver: usb_f_printer?

I found just usb_f_printer.o file in /drivers/usb/gadget/function

how to use the usb_f_printer?

if I use udev, is it automatically run?

thanks for your reply

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How to build the g_printer gadget in the kernel?