linux/drivers/usb
Geert Uytterhoeven 58f2266f40 usb: core: Allow compilation on platforms where NO_DMA=y
Some platforms don't have DMA, but we should still be able to build USB
drivers for these platforms. They could still be used through vhci_hcd,
usbip_host, or maybe something like USB passthrough in UML from a
capable host.

If NO_DMA=y:

    ERROR: "dma_pool_destroy" [drivers/usb/core/usbcore.ko] undefined!
    ERROR: "bad_dma_ops" [drivers/usb/core/usbcore.ko] undefined!
    ERROR: "dma_pool_free" [drivers/usb/core/usbcore.ko] undefined!
    ERROR: "dma_pool_alloc" [drivers/usb/core/usbcore.ko] undefined!
    ERROR: "dma_pool_create" [drivers/usb/core/usbcore.ko] undefined!

Add a few checks for CONFIG_HAS_DMA to fix this.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20 20:22:55 -08:00
..
atm USB: cxacru: fix an bounds check warning 2016-02-03 13:52:10 -08:00
c67x00 c67x00-hcd: use USB_DT_HUB 2015-04-03 19:03:16 +02:00
chipidea chipidea: error on overflow for port_test_write 2016-02-20 20:15:57 -08:00
class usb: usbtmc: Fix disconnect/poll interaction 2016-02-20 20:21:53 -08:00
common usb: define USB_SPEED_SUPER_PLUS speed for SuperSpeedPlus USB3.1 devices 2016-01-24 20:16:52 -08:00
core usb: core: Allow compilation on platforms where NO_DMA=y 2016-02-20 20:22:55 -08:00
dwc2 usb: add HAS_IOMEM dependency to USB_DWC2 2016-02-14 17:09:56 -08:00
dwc3 usb: dwc3: gadget: set the OTG flag in dwc3 gadget driver. 2016-02-03 23:58:20 +02:00
early
gadget usb: add HAS_IOMEM dependency to USB_PXA27X 2016-02-14 17:09:56 -08:00
host usb: host: xhci-rcar: Use ARCH_RENESAS 2016-02-20 20:21:53 -08:00
image scsi: Do not set cmd_per_lun to 1 in the host template 2015-05-31 18:06:28 -07:00
isp1760 usb: isp1760: udc: add ep capabilities support 2015-08-04 12:26:55 -05:00
misc usb/misc/chaoskey: introduce an URB for asynchronous reads 2016-02-20 20:12:21 -08:00
mon usb: core: rename mutex usb_bus_list_lock to usb_bus_idr_lock 2016-02-06 21:55:57 -08:00
musb usb: add HAS_IOMEM dependency to USB_MUSB_HDRC 2016-02-14 17:09:56 -08:00
phy usb: phy: mxs: declare variable with initialized value 2016-02-03 19:57:41 +02:00
renesas_usbhs usb: renesas_usbhs: Use ARCH_RENESAS 2016-02-20 20:21:53 -08:00
serial USB: option: fix Cinterion AHxx enumeration 2016-01-25 13:32:53 +01:00
storage usb: storage: use usb_store_dbg instead of US_DEBUGPX 2016-02-20 20:21:53 -08:00
usbip usb: usbip: Fix possible deadlocks reported by lockdep 2016-02-03 13:52:10 -08:00
wusbcore USB: core, wusbcore: use bus_to_hcd 2016-01-24 21:00:33 -08:00
Kconfig usb: isp1760: Move driver from drivers/usb/host/ to drivers/usb/isp1760/ 2015-01-27 09:39:38 -06:00
Makefile usb-host: Remove fusbh200 driver 2015-10-16 23:44:33 -07:00
README
usb-skeleton.c

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.