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最終更新:2018-01-12 (金) 08:10:45 (2296d)

Linux
Linux/HID
Top / Linux / HID

ドキュメント

kernel.org/doc/Documentation/hid
- kernel.org/doc/Documentation/hid/hid-transport.txt (Linux 3.15～)
- kernel.org/doc/Documentation/hid/hid-sensor.txt?
- kernel.org/doc/Documentation/hid/hiddev.txt
- kernel.org/doc/Documentation/hid/hidraw.txt
- kernel.org/doc/Documentation/hid/uhid.txt

ソースコード

メモ

	Linux 3.4	Linux 3.5
CONFIG_HID	Generic HID support	HID bus support
CONFIG_USB_HID	USB Human Interface Device (full HID) support	USB HID transport layer
汎用HIDドライバ (キーボードとか)	generic-usb (drivers/hid/usbhid/hid-core.c)	hid-generic (drivers/hid/hid-generic.c)

.config

drivers/hid/Kconfig

CONFIG_HID_SUPPORT? (～Linux 3.4)
CONFIG_HID - hid
- 〜Linux 3.4 - Generic HID support
- Linux 3.5〜 - HID bus support
CONFIG_HID_BATTERY_STRENGTH?
CONFIG_HIDRAW - hidraw - HID raw devices, giving access to raw HID events.
CONFIG_UHID - uhid?
CONFIG_HID_GENERIC - hid-generic (Linux 3.5～)

Special HID Drivers (抜粋)
- CONFIG_HID_APPLE?
- CONFIG_HID_LOGITECH_DJ
- CONFIG_HID_MAGICMOUSE?
- CONFIG_HID_MICROSOFT?
- CONFIG_HID_MULTITOUCH - hid-multitouch
- CONFIG_HID_SONY
- CONFIG_HID_WACOM
- CONFIG_HID_WIIMOTE?

drivers/hid/usbhid/Kconfig

CONFIG_USB_HID - usbhid - USB HID transport layer
CONFIG_HID_PID?
CONFIG_USB_HIDDEV - hiddev
CONFIG_USB_KBD - usbkbd
CONFIG_USB_MOUSE? - usbmouse

drivers/hid/i2c-hid/Kconfig?

ドライバ

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

ローレベルドライバ (hid_ll_driver)

usb_hid_driver (USB)

drivers/hid/usbhid/hid-core.c

hidp_hid_driver? (Bluetooth)

net/bluetooth/hidp/core.c?

i2c_hid_ll_driver? (I2C)

Linux 3.8～
drivers/hid/i2c-hid/i2c-hid.c?

uhid_hid_driver? (UHID)

Linux 3.6～
drivers/hid/uhid.c

汎用ドライバ

〜Linux 3.4
- CONFIG_USB_HID - usbhid (name=generic-usb)
- drivers/hid/usbhid/hid-core.c
Linux 3.5〜
- CONFIG_HID_GENERIC - hid_generic? (name=hid-generic)
- drivers/hid/hid-generic.c

hid - HID bus support

CONFIG_HID

usbhid - USB HID transport layer

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

hid-generic - Generic HID driver

CONFIG_HID_GENERIC (Linux 3.5～)
hid_driver hid_generic? (name=generic-usb)

usbmouse/usbkbd

ブートプロトコル用のドライバ。
Say Y here only if you are absolutely sure that you don't want to use the generic HID driver for your USB keyboard and prefer to use the keyboard in its limited Boot Protocol mode instead.

For embedded systems, for mice with broken HID descriptors and just any other use when the big usbhid wouldn't be a good choice, there is the usbmouse driver.

hid-multitouchとか

ドライバの判定

VID

drivers/hid/hid-ids.h
drivers/hid/hid-core.c
- 配列
  - hid_have_special_driver - A list of devices for which there is a specialized driver on HID bus.
  - hid_ignore_list? - a list of devices that shouldn't be handled by HID core at all
  - hid_mouse_ignore_list? - mouse devices which should not be handled by the hid layer
- 関数
  - hid_match_id?(struct hid_device *hdev, const struct hid_device_id *id)
  - hid_match_one_id(struct hid_device *hdev, const struct hid_device_id *id)

linux/mod_devicetable.h
- hid_device_id

hid

init

drivers/hid/hid-core.c

module_init(hid_init);

bus_register(hid_bus_type) - hid

static struct bus_type hid_bus_type = {
        .name           = "hid",
        .dev_groups     = hid_dev_groups,
        .match          = hid_bus_match,
        .probe          = hid_device_probe,
        .remove         = hid_device_remove,
        .uevent         = hid_uevent,
};

bus_type.probe = hid_device_probe (drivers/hid/hid-core.c)

down_interruptible
hid_match_device
- hid_match_one_id
- hid_driver.probe -> mt_probe?
- hid_match_id?
hid_open_report
hid_hw_start
- hid_connect - ここでhiddev/hidrawとして登録
  - hidinput_connect - drivers/hid/hid-input.c (HID to Linux Input mapping)
  - hiddev_connect? - hiddev - drivers/hid/usbhid/hiddev.c?
  - hidraw_connect? - hidraw - drivers/hid/hidraw.c
  - device_create_bin_file?
hid_close_report?

usbhid

drivers/hid/usbhid/hid-core.c

module_init(hid_init);

usbhid_quirks_init?

usb_register(hid_driver) - usbhid

static struct usb_driver hid_driver = {
        .name =         "usbhid",
        .probe =        usbhid_probe,
        .disconnect =   usbhid_disconnect,
#ifdef CONFIG_PM
        .suspend =      hid_suspend,
        .resume =       hid_resume,
        .reset_resume = hid_reset_resume,
#endif
        .pre_reset =    hid_pre_reset,
        .post_reset =   hid_post_reset,
        .id_table =     hid_usb_ids,
        .supports_autosuspend = 1,
};

usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
- driver_register
- usb_create_newid_files

usb_driver.probe = usbhid_probe()

usbcoreのusb_probe_interfaceから呼ばれる
usb_endpoint_is_int_in?
hid_allocate_device?
usb_set_intfdata?
usbhid_lookup_quirk
usb_make_path?
usb_string
init_waitqueue_head?
hid_add_device
- hid_have_special_driverかどうかの判定
- hid_scan_report? - Scan a report descriptor before the device is added to the bus.

hid-multitouch

drivers/hid/hid-multitouch.c

module_hid_driver(mt_driver);

static struct hid_driver mt_driver = {
        .name = "hid-multitouch",
        .id_table = mt_devices,
        .probe = mt_probe,
        .remove = mt_remove,
        .input_mapping = mt_input_mapping,
        .input_mapped = mt_input_mapped,
        .input_configured = mt_input_configured,
        .feature_mapping = mt_feature_mapping,
        .usage_table = mt_grabbed_usages,
        .event = mt_event,
        .report = mt_report,
#ifdef CONFIG_PM
        .reset_resume = mt_reset_resume,
        .resume = mt_resume,
#endif
};

module_driver(mt_driver, hid_register_driver, hid_unregister_driver?)
- driver_register(mt_driver->driver)
- driver_create_file

hid_driver.probe = mt_probe?()

hidのhid_match_deviceから呼ばれる
devm_kzalloc?
hid_set_drvdata?
hid_parse
hid_hw_start
sysfs_create_group

API

hidraw

/dev/hidraw raw HID device support
Linux/dev/hidrawXを通してHIDデバイスを読み書き
CONFIG_HIDRAW - Linux 2.6.24?～
In comparison to hiddev, this device does not process the hid events at all (no parsing, no lookups)

hiddev

/dev/hiddev raw HID device support
CONFIG_USB_HIDDEV - Linux 2.6.22?～
Linux/dev/usb/hiddev?
drivers/hid/usbhid/hiddev.c?

UHID

User-space I/O driver support for HID subsystem
HIDのトランスポートレイヤを実装するためのドライバ。
drivers/hid/uhid.c

ドライバ

drivers/hid

hid_ll_driver - low level driver callbacks

usb_hid_driver - USB/HID
hidp_hid_driver? - Bluetooth/HID
i2c_hid_ll_driver? - I2C/HID
uhid_hid_driver? - UHID
mousevsc_ll_driver? - Hyper-V
logi_dj_ll_driver?

usb_class_driver

hiddev_class? - hiddev%d

usb_driver

hid_driver - usbhid
usb_kbd_driver? - usbkbd
usb_mouse_driver? - usbmouse

hid

drivers/hid/hid.ko?
drivers/hid/hid-input.c - HID to Linux Input mapping
hid-core.ko?

hid_generic?

drivers/hid/hid-generic.ko?
depends:hid

mac_hid?

drivers/macintosh/mac_hid.ko?

g_hid

drivers/gadget/g_hid.ko?

Bluetooth

net/bluetooth/hidp/hidp.ko?