Change since v1:
optimize the export connect type patch and adjust the DeviceRemovalbe flag
in the rh_call_control() after GetHubDescriptor request being processed.
move all debounce operation to usb port's runtime resume callback(). Add
did_runtime_put in the struct usb_port to call pm_runtime_get/put(portdev) paired.
using pm_runtime_get/put(portdev) to allow or prohibit device to be power
off inside of pm qos request in the kernel side.
Change since v2:
Correct some link breaks.
Add did_runtime_put in the usb_disconnect() before calling pm_runtime_put(portdev).
Provide two seperate functions usb_device_allow_power_off() and usb_device_prevent_power_off()
instead of just one.
Change since v3:
Set did_runtime_put to false in usb_disconnect() when its value is true
Add comment about "not enable port runtime pm if fail to expose port's pm qos." and call
pm_runtime_set_active(portdev) unconditionally.
rename "usb_device_allow_prevent_power_off" with "usb_device_control_power_off"
Modify "be power off" to "be powered off"
Expose dev_pm_qos_flags() symbol in order to ensure usb core can compile as module.
Resend v4:
make patch "PM/Qos: Expose dev_pm_qos_flags symbol" as first patch to avoid compilation
error during "git bisect"
correct some comments.
This Patchset is based on usb-next tree commit 102ee001912 "Merge tag 'for-usb-next-2013-01-03'"
This patchset is to add usb port power off mechanism and
merge with patchset "usb: expose DeviceRemovable to user space via sysfs attribute".
Patchset "usb: expose DeviceRemovable to user space via sysfs attribute".
http://marc.info/?l=linux-usb&m=135279430410171&w=2 with some link break corrects
The main discussion about usb port power off mechanism is in the following link:
http://marc.info/?l=linux-usb&m=134818340017208&w=2
PM/Qos: Expose dev_pm_qos_flags symbol
usb: Add driver/usb/core/(port.c,hub.h) files
USB: Set usb port's DeviceRemovable according acpi information
usb: Add "portX/connect_type" attribute to expose usb port's connect type
usb: Create link files between child device and usb port device.
usb: Register usb port's acpi power resources
usb: add runtime pm support for usb port device
usb: add usb port auto power off mechanism
usb: expose usb port's pm qos flags to user space
usb: add usb_device_allow_power_off() and usb_device_prevent_power_off() function.
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