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Commit de55d871 authored by MyungJoo Ham's avatar MyungJoo Ham Committed by Greg Kroah-Hartman
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Extcon (external connector): import Android's switch class and modify. 



External connector class (extcon) is based on and an extension of
Android kernel's switch class located at linux/drivers/switch/.

This patch provides the before-extension switch class moved to the
location where the extcon will be located (linux/drivers/extcon/) and
updates to handle class properly.

The before-extension class, switch class of Android kernel, commits
imported are:

switch: switch class and GPIO drivers. (splitted)
Author: Mike Lockwood <lockwood@android.com>

switch: Use device_create instead of device_create_drvdata.
Author: Arve Hjønnevåg <arve@android.com>

In this patch, upon the commits of Android kernel, we have added:
- Relocated and renamed for extcon.
- Comments, module name, and author information are updated
- Code clean for successing patches
- Bugfix: enabling write access without write functions
- Class/device/sysfs create/remove handling
- Added comments about uevents
- Format changes for extcon_dev_register() to have a parent dev.

Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>

--
Changes from v7
- Compiler error fixed when it is compiled as a module.
- Removed out-of-date Kconfig entry

Changes from v6
- Updated comment/strings
- Revised "Android-compatible" mode.
   * Automatically activated if CONFIG_ANDROID && !CONFIG_ANDROID_SWITCH
   * Creates /sys/class/switch/*, which is a copy of /sys/class/extcon/*

Changes from v5
- Split the patch
- Style fixes
- "Android-compatible" mode is enabled by Kconfig option.

Changes from v2
- Updated name_show
- Sysfs entries are handled by class itself.
- Updated the method to add/remove devices for the class
- Comments on uevent send
- Able to become a module
- Compatible with Android platform

Changes from RFC
- Renamed to extcon (external connector) from multistate switch
- Added a seperated directory (drivers/extcon)
- Added kerneldoc comments
- Removed unused variables from extcon_gpio.c
- Added ABI Documentation.
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7cd9c9bb

Documentation/ABI/testing/sysfs-class-extcon

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What:		/sys/class/extcon/.../

Date:		December 2011

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.



What:		/sys/class/extcon/.../name

Date:		December 2011

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:		December 2011

Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>

Description:

		The /sys/class/extcon/.../state shows the cable attach/detach

		information of the corresponding extcon object. If the extcon

		objecct has an optional callback "show_state" defined, the

		callback will provide the name with this sysfs node.

drivers/Kconfig

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@@ -140,4 +140,6 @@ source "drivers/virt/Kconfig" 


source "drivers/devfreq/Kconfig"



source "drivers/extcon/Kconfig"



endmenu

drivers/Makefile

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@@ -134,3 +134,4 @@ obj-$(CONFIG_VIRT_DRIVERS) += virt/ 
obj-$(CONFIG_HYPERV)		+= hv/



obj-$(CONFIG_PM_DEVFREQ)	+= devfreq/

obj-$(CONFIG_EXTCON)		+= extcon/

drivers/extcon/Kconfig

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menuconfig EXTCON

	tristate "External Connector Class (extcon) support"

	help

	  Say Y here to enable external connector class (extcon) support.

	  This allows monitoring external connectors by userspace

	  via sysfs and uevent and supports external connectors with

	  multiple states; i.e., an extcon that may have multiple

	  cables attached. For example, an external connector of a device

	  may be used to connect an HDMI cable and a AC adaptor, and to

	  host USB ports. Many of 30-pin connectors including PDMI are

	  also good examples.



if EXTCON



comment "Extcon Device Drivers"



endif # MULTISTATE_SWITCH

drivers/extcon/Makefile

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#

# Makefile for external connector class (extcon) devices

#



obj-$(CONFIG_EXTCON)		+= extcon_class.o