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- What: /sys/class/extcon/.../
- Date: February 2012
- Contact: MyungJoo Ham <[email protected]>
- Description:
- Provide a place in sysfs for the extcon objects.
- This allows accessing extcon specific variables.
- The name of extcon object denoted as ... is the name given
- with extcon_dev_register.
- One extcon device denotes a single external connector
- port. An external connector may have multiple cables
- attached simultaneously. Many of docks, cradles, and
- accessory cables have such capability. For example,
- the 30-pin port of Nuri board (/arch/arm/mach-exynos)
- may have both HDMI and Charger attached, or analog audio,
- video, and USB cables attached simultaneously.
- If there are cables mutually exclusive with each other,
- such binary relations may be expressed with extcon_dev's
- mutually_exclusive array.
- What: /sys/class/extcon/.../name
- Date: February 2012
- Contact: MyungJoo Ham <[email protected]>
- Description:
- The /sys/class/extcon/.../name shows the name of the extcon
- object. If the extcon object has an optional callback
- "show_name" defined, the callback will provide the name with
- this sysfs node.
- What: /sys/class/extcon/.../state
- Date: February 2012
- Contact: MyungJoo Ham <[email protected]>
- Description:
- The /sys/class/extcon/.../state shows and stores the cable
- attach/detach information of the corresponding extcon object.
- If the extcon object has an optional callback "show_state"
- defined, the showing function is overridden with the optional
- callback.
- If the default callback for showing function is used, the
- format is like this::
- # cat state
- USB_OTG=1
- HDMI=0
- TA=1
- EAR_JACK=0
- #
- In this example, the extcon device has USB_OTG and TA
- cables attached and HDMI and EAR_JACK cables detached.
- In order to update the state of an extcon device, enter a hex
- state number starting with 0x::
- # echo 0xHEX > state
- This updates the whole state of the extcon device.
- Inputs of all the methods are required to meet the
- mutually_exclusive conditions if they exist.
- It is recommended to use this "global" state interface if
- you need to set the value atomically. The later state
- interface associated with each cable cannot update
- multiple cable states of an extcon device simultaneously.
- What: /sys/class/extcon/.../cable.X/name
- Date: February 2012
- Contact: MyungJoo Ham <[email protected]>
- Description:
- The /sys/class/extcon/.../cable.X/name shows the name of cable
- "X" (integer between 0 and 31) of an extcon device.
- What: /sys/class/extcon/.../cable.X/state
- Date: February 2012
- Contact: MyungJoo Ham <[email protected]>
- Description:
- The /sys/class/extcon/.../cable.X/state shows and stores the
- state of cable "X" (integer between 0 and 31) of an extcon
- device. The state value is either 0 (detached) or 1
- (attached).
- What: /sys/class/extcon/.../mutually_exclusive/...
- Date: December 2011
- Contact: MyungJoo Ham <[email protected]>
- Description:
- Shows the relations of mutually exclusiveness. For example,
- if the mutually_exclusive array of extcon device is
- {0x3, 0x5, 0xC, 0x0}, then the output is::
- # ls mutually_exclusive/
- 0x3
- 0x5
- 0xc
- #
- Note that mutually_exclusive is a sub-directory of the extcon
- device and the file names under the mutually_exclusive
- directory show the mutually-exclusive sets, not the contents
- of the files.
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