[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / usb / README

To understand all the Linux-USB framework, you'll use these resources:

    * This source code.  This is necessarily an evolving work, and
      includes kerneldoc that should help you get a current overview.
      ("make pdfdocs", and then look at "usb.pdf" for host side and
      "gadget.pdf" for peripheral side.)  Also, Documentation/usb has
      more information.

    * The USB 2.0 specification (from www.usb.org), with supplements
      such as those for USB OTG and the various device classes.
      The USB specification has a good overview chapter, and USB
      peripherals conform to the widely known "Chapter 9".

    * Chip specifications for USB controllers.  Examples include
      host controllers (on PCs, servers, and more); peripheral
      controllers (in devices with Linux firmware, like printers or
      cell phones); and hard-wired peripherals like Ethernet adapters.

    * Specifications for other protocols implemented by USB peripheral
      functions.  Some are vendor-specific; others are vendor-neutral
      but just standardized outside of the www.usb.org team.

Here is a list of what each subdirectory here is, and what is contained in
them.

core/		- This is for the core USB host code, including the
		  usbfs files and the hub class driver ("hub_wq").

host/		- This is for USB host controller drivers.  This
		  includes UHCI, OHCI, EHCI, and others that might
		  be used with more specialized "embedded" systems.

gadget/		- This is for USB peripheral controller drivers and
		  the various gadget drivers which talk to them.


Individual USB driver directories.  A new driver should be added to the
first subdirectory in the list below that it fits into.

image/		- This is for still image drivers, like scanners or
		  digital cameras.
../input/	- This is for any driver that uses the input subsystem,
		  like keyboard, mice, touchscreens, tablets, etc.
../media/	- This is for multimedia drivers, like video cameras,
		  radios, and any other drivers that talk to the v4l
		  subsystem.
../net/		- This is for network drivers.
serial/		- This is for USB to serial drivers.
storage/	- This is for USB mass-storage drivers.
class/		- This is for all USB device drivers that do not fit
		  into any of the above categories, and work for a range
		  of USB Class specified devices. 
misc/		- This is for all USB device drivers that do not fit
		  into any of the above categories.
Commit	Line	Data
	1	To understand all the Linux-USB framework, you'll use these resources:
	2
	3	* This source code. This is necessarily an evolving work, and
	4	includes kerneldoc that should help you get a current overview.
	5	("make pdfdocs", and then look at "usb.pdf" for host side and
	6	"gadget.pdf" for peripheral side.) Also, Documentation/usb has
	7	more information.
	8
	9	* The USB 2.0 specification (from www.usb.org), with supplements
	10	such as those for USB OTG and the various device classes.
	11	The USB specification has a good overview chapter, and USB
	12	peripherals conform to the widely known "Chapter 9".
	13
	14	* Chip specifications for USB controllers. Examples include
	15	host controllers (on PCs, servers, and more); peripheral
	16	controllers (in devices with Linux firmware, like printers or
	17	cell phones); and hard-wired peripherals like Ethernet adapters.
	18
	19	* Specifications for other protocols implemented by USB peripheral
	20	functions. Some are vendor-specific; others are vendor-neutral
	21	but just standardized outside of the www.usb.org team.
	22
	23	Here is a list of what each subdirectory here is, and what is contained in
	24	them.
	25
	26	core/ - This is for the core USB host code, including the
	27	usbfs files and the hub class driver ("hub_wq").
	28
	29	host/ - This is for USB host controller drivers. This
	30	includes UHCI, OHCI, EHCI, and others that might
	31	be used with more specialized "embedded" systems.
	32
	33	gadget/ - This is for USB peripheral controller drivers and
	34	the various gadget drivers which talk to them.
	35
	36
	37	Individual USB driver directories. A new driver should be added to the
	38	first subdirectory in the list below that it fits into.
	39
	40	image/ - This is for still image drivers, like scanners or
	41	digital cameras.
	42	../input/ - This is for any driver that uses the input subsystem,
	43	like keyboard, mice, touchscreens, tablets, etc.
	44	../media/ - This is for multimedia drivers, like video cameras,
	45	radios, and any other drivers that talk to the v4l
	46	subsystem.
	47	../net/ - This is for network drivers.
	48	serial/ - This is for USB to serial drivers.
	49	storage/ - This is for USB mass-storage drivers.
	50	class/ - This is for all USB device drivers that do not fit
	51	into any of the above categories, and work for a range
	52	of USB Class specified devices.
	53	misc/ - This is for all USB device drivers that do not fit
	54	into any of the above categories.