f3f3253d64
This patch associates hub suspend and resume logic (including for root hubs)
with CONFIG_PM -- instead of CONFIG_USB_SUSPEND as before -- thereby unifying
two troublesome versions of suspend logic into just one. It'll be easier to
keep things right from now on.
- Now usbcore _always_ calls hcd->hub_suspend as needed, instead of
only when USB_SUSPEND is enabled:
* Those root hub methods are now called from hub suspend/resume;
no more skipping between layers during device suspend/resume;
* It now handles cases allowed by sysfs or autosuspended root hubs,
by forcing the hub interface to resume too.
- All devices, including virtual root hubs, now get the same treatment
on their resume paths ... including re-activating all their interfaces.
Plus it gets rid of those stub copies of usb_{suspend,resume}_device(), and
updates the Kconfig to match the new definition of USB_SUSPEND: it provides
(a) selective suspend, downstream from hubs; and (b) remote wakeup, upstream
from any device configuration which supports it.
This calls for minor followup patches for most HCDs (and their PCI glue).
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/usb/core/Kconfig | 11 ++-
drivers/usb/core/hub.c | 163 +++++++++++++++++++++++++----------------------
2 files changed, 97 insertions(+), 77 deletions(-)
102 lines
3.4 KiB
Text
102 lines
3.4 KiB
Text
#
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# USB Core configuration
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#
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config USB_DEBUG
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bool "USB verbose debug messages"
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depends on USB
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help
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Say Y here if you want the USB core & hub drivers to produce a bunch
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of debug messages to the system log. Select this if you are having a
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problem with USB support and want to see more of what is going on.
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comment "Miscellaneous USB options"
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depends on USB
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config USB_DEVICEFS
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bool "USB device filesystem"
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depends on USB
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---help---
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If you say Y here (and to "/proc file system support" in the "File
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systems" section, above), you will get a file /proc/bus/usb/devices
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which lists the devices currently connected to your USB bus or
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busses, and for every connected device a file named
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"/proc/bus/usb/xxx/yyy", where xxx is the bus number and yyy the
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device number; the latter files can be used by user space programs
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to talk directly to the device. These files are "virtual", meaning
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they are generated on the fly and not stored on the hard drive.
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You may need to mount the usbfs file system to see the files, use
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mount -t usbfs none /proc/bus/usb
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For the format of the various /proc/bus/usb/ files, please read
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<file:Documentation/usb/proc_usb_info.txt>.
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Please note that this code is completely unrelated to devfs, the
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"/dev file system support".
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Most users want to say Y here.
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config USB_BANDWIDTH
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bool "Enforce USB bandwidth allocation (EXPERIMENTAL)"
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depends on USB && EXPERIMENTAL
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help
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If you say Y here, the USB subsystem enforces USB bandwidth
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allocation and will prevent some device opens from succeeding
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if they would cause USB bandwidth usage to go above 90% of
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the bus bandwidth.
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If you say N here, these conditions will cause warning messages
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about USB bandwidth usage to be logged and some devices or
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drivers may not work correctly.
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config USB_DYNAMIC_MINORS
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bool "Dynamic USB minor allocation (EXPERIMENTAL)"
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depends on USB && EXPERIMENTAL
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help
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If you say Y here, the USB subsystem will use dynamic minor
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allocation for any device that uses the USB major number.
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This means that you can have more than 16 of a single type
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of device (like USB printers).
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If you are unsure about this, say N here.
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config USB_SUSPEND
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bool "USB selective suspend/resume and wakeup (EXPERIMENTAL)"
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depends on USB && PM && EXPERIMENTAL
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help
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If you say Y here, you can use driver calls or the sysfs
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"power/state" file to suspend or resume individual USB
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peripherals.
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Also, USB "remote wakeup" signaling is supported, whereby some
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USB devices (like keyboards and network adapters) can wake up
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their parent hub. That wakeup cascades up the USB tree, and
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could wake the system from states like suspend-to-RAM.
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If you are unsure about this, say N here.
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config USB_OTG
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bool
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depends on USB && EXPERIMENTAL
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select USB_SUSPEND
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default n
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config USB_OTG_WHITELIST
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bool "Rely on OTG Targeted Peripherals List"
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depends on USB_OTG
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default y
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help
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If you say Y here, the "otg_whitelist.h" file will be used as a
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product whitelist, so USB peripherals not listed there will be
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rejected during enumeration. This behavior is required by the
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USB OTG specification for all devices not on your product's
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"Targeted Peripherals List".
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Otherwise, peripherals not listed there will only generate a
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warning and enumeration will continue. That's more like what
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normal Linux-USB hosts do (other than the warning), and is
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convenient for many stages of product development.
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