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Linux/HID

usbhid

Top / usbhid

USB HID transport layer

メモ

• Linux 3.4まではHIDの汎用ドライバの処理(generic-usb)を含んでいた
• Linux 3.5からはhid-genericに分割された

.config

• CONFIG_USB_HID

メモ

• usbhid is the largest and most complex driver of the whole suite. It handles all HID devices, and because there is a very wide variety of them, and because the USB HID specification isn't simple, it needs to be this big.
• Currently, it handles USB mice, joysticks, gamepads, steering wheels keyboards, trackballs and digitizers.
• However, USB uses HID also for monitor controls, speaker controls, UPSs, LCDs and many other purposes.
• The monitor and speaker controls should be easy to add to the hid/input interface, but for the UPSs and LCDs it doesn't make much sense. For this, the hiddev interface was designed. See kernel.org/doc/Documentation/hid/hiddev.txt for more information about it.
• The usage of the usbhid module is very simple, it takes no parameters, detects everything automatically and when a HID device is inserted, it detects it appropriately.
• However, because the devices vary wildly, you might happen to have a device that doesn't work well. In that case #define DEBUG at the beginning of hid-core.c and send me the syslog traces.

• kernel.org/doc/Documentation/input/input.txt

ソースコード

drivers/hid/usbhid/usbhid.h?

drivers/hid/usbhid/hid-core.c

• USB HID support for Linux

init

• module_init(hid_init);
  • usbhid_quirks_init?
  • usb_register(hid_driver); - usbhid

exit

• module_exit?(hid_exit?);
  • usb_deregister?

probe

• usb_endpoint_is_int_in?
• hid_allocate_device?
• usb_set_intfdata?
• hid->ll_driver = usb_hid_driver;

  static struct hid_ll_driver usb_hid_driver = {
          .parse = usbhid_parse,
          .start = usbhid_start,
          .stop = usbhid_stop,
          .open = usbhid_open,
          .close = usbhid_close,
          .power = usbhid_power,
          .request = usbhid_request,
          .wait = usbhid_wait_io,
          .idle = usbhid_idle,
  };

• #ifdef CONFIG_USB_HIDDEV
  • hid->hiddev_connect = hiddev_connect;
  • hid->hiddev_disconnect = hiddev_disconnect;
  • hid->hiddev_hid_event = hiddev_hid_event;
  • hid->hiddev_report_event = hiddev_report_event;
• #endif
• usb_make_path?
• hid_add_device
  • device_add

drivers/hid/usbhid/hid-quirks.c

• USB HID quirks support for Linux

drivers/hid/usbhid/hiddev.c?

• HID char devices, giving access to raw HID device events. (CONFIG_USB_HIDDEV)
• hiddev

drivers/hid/usbhid/hid-pidff.c?

• Force feedback driver for USB HID PID compliant devices (CONFIG_HID_PID?)

ブートモードのドライバ

• usbkbd - CONFIG_USB_KBD - USB HIDBP Keyboard (simple Boot) support
• usbmouse - CONFIG_USB_MOUSE? - USB HIDBP Mouse (simple Boot) support

関連

• hid
• hid-generic
• hid-multitouch