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Linux/USBガジェット/モジュール

Linux/USBガジェット/HID

Top / Linux / USBガジェット / HID

概要

• The HID Gadget driver provides emulation of USB Human Interface Devices (HID).
• The basic HID handling is done in the kernel, and HID reports can be sent/received through I/O on the /dev/hidgX character devices.

.config

• 	設定	説明	フレームワーク
  Linux 3.19～	CONFIG_USB_CONFIGFS_F_HID	drivers/usb/gadget/Kconfig	CONFIG_USB_CONFIGFS
  Linux 3.17～	CONFIG_USB_G_HID	drivers/usb/gadget/legacy/Kconfig	CONFIG_USB_LIBCOMPOSITE
  Linux 3.7～	CONFIG_USB_G_HID	drivers/usb/gadget/Kconfig	CONFIG_USB_LIBCOMPOSITE
  Linux 2.6.35～	CONFIG_USB_G_HID	drivers/usb/gadget/Kconfig

ドライバ

• g_hid

ドキュメント・サンプル

• kernel.org/doc/Documentation/usb/gadget_hid.txt

デバイスファイル

• Linux/dev/hidg

ソースコード

カーネル側

• drivers/usb/gadget/hid.c
• drivers/usb/gadget/f_hid.c

ユーザ側

• hid_gadget_test.c

手順

• http://www.linuxquestions.org/questions/linux-newbie-8/linux-usb-gadget-hid-driver-problem-840733-print/
• step1: go to the link below.
  • kernel.org/doc/Documentation/usb/gadget_hid.txt
• step2: copy the following two structures from the above link and paste into drivers/usb/gadget/hid.c
  • hidg_func_descriptor my_hid_data
  • platform_device my_hid

    int status;
    status = platform_device_register(&my_hid);
    if (status < 0)
    {
    	platform_driver_unregister(&my_hid);
    	return status;
    }

• step3: compile the hid module
• step4: load the module

ディスクリプタの定義

kernel.org/doc/Documentation/usb/gadget_hid.txt

• g_hid is a platform driver, so to use it you need to add struct platform_device(s) to your platform code defining the HID function descriptors you want to use.

https://users.atmark-techno.com/blog/750/2465

• /arch/arm/mach-shmobile/board-armadillo810.c b/arch/arm/mach-shmobile/board-armadillo810.cの中に
  • hidg_func_descriptor my_hid_dataとplatform_device my_hidを定義して
  • platform_device_register(&my_hid);してる

g_hid-demo

• Normally the platform_device descriptor would be part of the board support for the device, e.g. in arch/arm/mach-omap2/devices.c, but for convenience I am putting it in to the g_hid module to make easier for testing.

参考

• Use pcDuino as a Mouse When its connected to a PC through USB OTG
• http://www.linuxquestions.org/questions/linux-newbie-8/linux-usb-gadget-hid-driver-problem-840733/
• Do More With Less
• https://www.mail-archive.com/linux-usb@vger.kernel.org/msg06155.html
• Turning your Raspberry PI Zero into a USB Gadget
• https://users.atmark-techno.com/blog/750/2465

関連

• configfs