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0cfbd328d6
With this patch, USB activity can be signaled by blinking a LED. There are two triggers, one for activity on USB host and one for USB gadget. Both triggers should work with all host/device controllers. Tested only with musb. Performace: I measured performance overheads on ARM Cortex-A8 (TI AM335x) running on 600 MHz. Duration of usb_led_activity(): - with no LED attached to the trigger: 2 ± 1 µs - with one GPIO LED attached to the trigger: 2 ± 1 µs or 8 ± 2 µs (two peaks in histogram) Duration of functions calling usb_led_activity() (with this patch applied and no LED attached to the trigger): - __usb_hcd_giveback_urb(): 10 - 25 µs - usb_gadget_giveback_request(): 2 - 6 µs Signed-off-by: Michal Sojka <sojka@merica.cz> Acked-by: Felipe Balbi <balbi@ti.com> Tested-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
163 lines
4.6 KiB
Plaintext
163 lines
4.6 KiB
Plaintext
#
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# USB device configuration
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#
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config USB_OHCI_BIG_ENDIAN_DESC
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bool
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config USB_OHCI_BIG_ENDIAN_MMIO
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bool
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config USB_OHCI_LITTLE_ENDIAN
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bool
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default n if STB03xxx || PPC_MPC52xx
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default y
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config USB_EHCI_BIG_ENDIAN_MMIO
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bool
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config USB_EHCI_BIG_ENDIAN_DESC
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bool
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menuconfig USB_SUPPORT
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bool "USB support"
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depends on HAS_IOMEM
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default y
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---help---
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This option adds core support for Universal Serial Bus (USB).
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You will also need drivers from the following menu to make use of it.
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if USB_SUPPORT
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config USB_COMMON
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tristate
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default y
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depends on USB || USB_GADGET
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config USB_ARCH_HAS_HCD
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def_bool y
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# ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.
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config USB
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tristate "Support for Host-side USB"
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depends on USB_ARCH_HAS_HCD
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select NLS # for UTF-8 strings
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---help---
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Universal Serial Bus (USB) is a specification for a serial bus
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subsystem which offers higher speeds and more features than the
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traditional PC serial port. The bus supplies power to peripherals
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and allows for hot swapping. Up to 127 USB peripherals can be
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connected to a single USB host in a tree structure.
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The USB host is the root of the tree, the peripherals are the
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leaves and the inner nodes are special USB devices called hubs.
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Most PCs now have USB host ports, used to connect peripherals
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such as scanners, keyboards, mice, modems, cameras, disks,
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flash memory, network links, and printers to the PC.
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Say Y here if your computer has a host-side USB port and you want
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to use USB devices. You then need to say Y to at least one of the
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Host Controller Driver (HCD) options below. Choose a USB 1.1
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controller, such as "UHCI HCD support" or "OHCI HCD support",
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and "EHCI HCD (USB 2.0) support" except for older systems that
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do not have USB 2.0 support. It doesn't normally hurt to select
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them all if you are not certain.
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If your system has a device-side USB port, used in the peripheral
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side of the USB protocol, see the "USB Gadget" framework instead.
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After choosing your HCD, then select drivers for the USB peripherals
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you'll be using. You may want to check out the information provided
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in <file:Documentation/usb/> and especially the links given in
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<file:Documentation/usb/usb-help.txt>.
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To compile this driver as a module, choose M here: the
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module will be called usbcore.
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if USB
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source "drivers/usb/core/Kconfig"
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source "drivers/usb/mon/Kconfig"
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source "drivers/usb/wusbcore/Kconfig"
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source "drivers/usb/host/Kconfig"
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source "drivers/usb/renesas_usbhs/Kconfig"
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source "drivers/usb/class/Kconfig"
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source "drivers/usb/storage/Kconfig"
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source "drivers/usb/image/Kconfig"
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source "drivers/usb/usbip/Kconfig"
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endif
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source "drivers/usb/musb/Kconfig"
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source "drivers/usb/dwc3/Kconfig"
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source "drivers/usb/dwc2/Kconfig"
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source "drivers/usb/chipidea/Kconfig"
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comment "USB port drivers"
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if USB
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config USB_USS720
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tristate "USS720 parport driver"
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depends on PARPORT
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select PARPORT_NOT_PC
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---help---
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This driver is for USB parallel port adapters that use the Lucent
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Technologies USS-720 chip. These cables are plugged into your USB
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port and provide USB compatibility to peripherals designed with
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parallel port interfaces.
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The chip has two modes: automatic mode and manual mode. In automatic
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mode, it looks to the computer like a standard USB printer. Only
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printers may be connected to the USS-720 in this mode. The generic
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USB printer driver ("USB Printer support", above) may be used in
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that mode, and you can say N here if you want to use the chip only
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in this mode.
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Manual mode is not limited to printers, any parallel port
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device should work. This driver utilizes manual mode.
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Note however that some operations are three orders of magnitude
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slower than on a PCI/ISA Parallel Port, so timing critical
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applications might not work.
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Say Y here if you own an USS-720 USB->Parport cable and intend to
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connect anything other than a printer to it.
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To compile this driver as a module, choose M here: the
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module will be called uss720.
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source "drivers/usb/serial/Kconfig"
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source "drivers/usb/misc/Kconfig"
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source "drivers/usb/atm/Kconfig"
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endif # USB
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source "drivers/usb/phy/Kconfig"
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source "drivers/usb/gadget/Kconfig"
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config USB_LED_TRIG
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bool "USB LED Triggers"
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depends on LEDS_CLASS && USB_COMMON && LEDS_TRIGGERS
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help
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This option adds LED triggers for USB host and/or gadget activity.
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Say Y here if you are working on a system with led-class supported
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LEDs and you want to use them as activity indicators for USB host or
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gadget.
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endif # USB_SUPPORT
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