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.
Change since v4:
use EXPORT_SYMBOL_GPL to export dev_pm_qos_flags().
correct some unnecessary link breaks.
Add CONFIG_USB_SUSPEND check around usb_port_runtime_resume() and usb_port_runtime_suspend()
Change since v5:
predefine struct usb_hub_descriptor in the /driver/usb/core/usb.h instead of including "linux/usb/ch11.h"
move patch "PM/Qos: Expose dev_pm_qos_flags symbol" before patch "usb: add runtime pm support for usb port device"
where dev_pm_qos_flags() fistly is called.
Change since v6:
Patch 1: add usb_acpi_register_power_resources() error handle. If there was acpi power resource for usb port and
register failed, produce a warning.
Patch 3: add kerneldoc for usb_hub_set_port_power()
Patch 4: add more detail change logs. Make clear_port_feature() and hdev_to_hub() as global symbol.
Extend hub_port_debounce() and add two wraps to call it. Change soeme indention.
Patch 6: add changelog
This patchset is based on usb-next tree commit d2123fd "USB: Set usb port's DeviceRemovable according acpi information"
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
usb: Register usb port's acpi power resources
PM/Qos: Expose dev_pm_qos_flags symbol
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: enable usb port device's async suspend.
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