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Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-extcon')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-extcon | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-extcon b/Documentation/ABI/testing/sysfs-class-extcon deleted file mode 100644 index 20ab361bd8c..00000000000 --- a/Documentation/ABI/testing/sysfs-class-extcon +++ /dev/null @@ -1,97 +0,0 @@ -What: /sys/class/extcon/.../ -Date: February 2012 -Contact: MyungJoo Ham <myungjoo.ham@samsung.com> -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 simulteneously. - - 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 <myungjoo.ham@samsung.com> -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 <myungjoo.ham@samsung.com> -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 overriden 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 have 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 dev. - Inputs of all the methods are required to meet the - mutually_exclusive contidions if they exist. - - It is recommended to use this "global" state interface if - you need to enter 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 <myungjoo.ham@samsung.com> -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 <myungjoo.ham@samsung.com> -Description: - The /sys/class/extcon/.../cable.x/name 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 <myungjoo.ham@samsung.com> -Description: - Shows the relations of mutually exclusiveness. For example, - if the mutually_exclusive array of extcon_dev is - {0x3, 0x5, 0xC, 0x0}, the, 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. |