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Date: Wed, 28 Mar 2012 18:39:08 +0900
From: MyungJoo Ham <myungjoo.ham@...il.com>
To: Arnd Bergmann <arnd@...db.de>, LKML <linux-kernel@...r.kernel.org>
Cc: NeilBrown <neilb@...e.de>, Randy Dunlap <rdunlap@...otime.net>,
Mike Lockwood <lockwood@...roid.com>,
Arve Hjønnevag <arve@...roid.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
gregkh@...uxfoundation.org,
Linus Walleij <linus.walleij@...aro.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Morten CHRISTIANSEN <morten.christiansen@...ricsson.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
John Stultz <john.stultz@...aro.org>,
Joerg Roedel <joerg.roedel@....com>, myungjoo.ham@...il.com,
cw00.choi@...sung.com
Subject: Re: [PATCH v7 0/6] Introduce External Connector Class (extcon)
Dear Arnd,
Could you please consider the EXTCON patchset for the current merge window?
If pulling from a branch is more convinient; please consider using:
A. EXTCON patchset without the RFC patch removing staging/android/switch class
or
B. EXTCON patchset with the RFC patch removing staging/android/switch class.
--------------------
PULL REQUEST for A
--------------------
The following changes since commit b01543dfe67bb1d191998e90d20534dc354de059:
Linux 3.3-rc4 (2012-02-18 15:53:33 -0800)
are available in the git repository at:
git://git.infradead.org/users/kmpark/linux-samsung extcon-for-next-2
(http://git.infradead.org/users/kmpark/linux-samsung/shortlog/refs/heads/extcon-for-next-2)
Donggeun Kim (1):
Extcon: support notification based on the state changes.
MyungJoo Ham (5):
Extcon (external connector): import Android's switch class and modify.
Extcon: support generic GPIO extcon driver
Extcon: support multiple states at a device.
Extcon: support mutually exclusive relation between cables.
Documentation/extcon: porting guide for Android kernel switch driver.
Documentation/ABI/testing/sysfs-class-extcon | 97 +++
Documentation/extcon/porting-android-switch-class | 124 +++
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/extcon/Kconfig | 35 +
drivers/extcon/Makefile | 6 +
drivers/extcon/extcon_class.c | 822 +++++++++++++++++++++
drivers/extcon/extcon_gpio.c | 175 +++++
include/linux/extcon.h | 322 ++++++++
include/linux/extcon/extcon_gpio.h | 52 ++
10 files changed, 1636 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-class-extcon
create mode 100644 Documentation/extcon/porting-android-switch-class
create mode 100644 drivers/extcon/Kconfig
create mode 100644 drivers/extcon/Makefile
create mode 100644 drivers/extcon/extcon_class.c
create mode 100644 drivers/extcon/extcon_gpio.c
create mode 100644 include/linux/extcon.h
create mode 100644 include/linux/extcon/extcon_gpio.h
--------------------
PULL REQUEST for B
--------------------
The following changes since commit b01543dfe67bb1d191998e90d20534dc354de059:
Linux 3.3-rc4 (2012-02-18 15:53:33 -0800)
are available in the git repository at:
git://git.infradead.org/users/kmpark/linux-samsung extcon-for-next
(http://git.infradead.org/users/kmpark/linux-samsung/shortlog/refs/heads/extcon-for-next)
Donggeun Kim (1):
Extcon: support notification based on the state changes.
MyungJoo Ham (6):
Extcon (external connector): import Android's switch class and modify.
Extcon: support generic GPIO extcon driver
Extcon: support multiple states at a device.
Extcon: support mutually exclusive relation between cables.
Documentation/extcon: porting guide for Android kernel switch driver.
Remove "switch" class in drivers/staging/android/switch
Documentation/ABI/testing/sysfs-class-extcon | 97 +++
Documentation/extcon/porting-android-switch-class | 124 +++
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/extcon/Kconfig | 35 +
drivers/extcon/Makefile | 6 +
drivers/extcon/extcon_class.c | 822 +++++++++++++++++++++
drivers/extcon/extcon_gpio.c | 175 +++++
drivers/staging/android/Kconfig | 2 -
drivers/staging/android/Makefile | 1 -
drivers/staging/android/switch/Kconfig | 11 -
drivers/staging/android/switch/Makefile | 4 -
drivers/staging/android/switch/switch.h | 53 --
drivers/staging/android/switch/switch_class.c | 174 -----
drivers/staging/android/switch/switch_gpio.c | 172 -----
include/linux/extcon.h | 322 ++++++++
include/linux/extcon/extcon_gpio.h | 52 ++
17 files changed, 1636 insertions(+), 417 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-class-extcon
create mode 100644 Documentation/extcon/porting-android-switch-class
create mode 100644 drivers/extcon/Kconfig
create mode 100644 drivers/extcon/Makefile
create mode 100644 drivers/extcon/extcon_class.c
create mode 100644 drivers/extcon/extcon_gpio.c
delete mode 100644 drivers/staging/android/switch/Kconfig
delete mode 100644 drivers/staging/android/switch/Makefile
delete mode 100644 drivers/staging/android/switch/switch.h
delete mode 100644 drivers/staging/android/switch/switch_class.c
delete mode 100644 drivers/staging/android/switch/switch_gpio.c
create mode 100644 include/linux/extcon.h
create mode 100644 include/linux/extcon/extcon_gpio.h
On Fri, Mar 23, 2012 at 5:52 PM, MyungJoo Ham <myungjoo.ham@...sung.com> wrote:
> For external connectors, which may have different types of cables attached
> (USB, TA, HDMI, Analog A/V, and others), we often have seperated device
> drivers that detect the state changes at the port and device drivers that
> do something according to the state changes.
>
> An example is a 4-pin (or more pins?) analog audio connector
> (usually referred as "3.5-pi" jacks). It can be implemented with the 5/5
> patch, "adc-jack", supplied with information about IRQ, a method to get
> ADC values, and ADC value ranges. With a 4-pin 3.5-pi port and adc-jack
> driver with proper ADC configurations, the following modes may be
> detected: "standard mono cable", "standard stereo cable",
> "standard stereo + remote cable", "standard stereo + mic + remote cable",
> "standard stereo + different-spec mic + remote cable", and such.
> Note that for 4-pin cables with mic and remote, there are multiple
> standards (at least Samsung and Apple use different configurations for
> those 4-pin earphones although the pins looks exactly same.)
> and they often can be distinguished with ADC values.
>
> Although we may have simply given different "cable id" for "stereo" and
> "stereo + mic". However, for those userspace processes or other device
> drivers that are interested only in "stereo" part of possible combinations,
> having seperated mode/id for "stereo" and "mic" is more desirable.
> For example, if we do not have multistate capabilities, those who want
> to know "stereo" is attached or not should monitor everything:
> "standard stereo cable", "standard stereo + remove cable",
> "standard stereo + mic + remote cable", and others. However, with
> multistate capabilities, they only need to monitor the bit associated
> with "standard stero".
>
> For another example, when MAX8997-MUIC detects a Charger cable insertion,
> another device driver (such as MAX8903 charger, MAX8997 charger, Charger
> Manager, or board file) needs to set charger current limit accordingly
> and when MAX8997-MUIC detects a HDMI cable insertion, multimedia device
> drivers need to do some operations accordingly.
>
>
> This patchset supports the usage of notifier for passing such information
> between device drivers.
>
> Another issue is that at a single switch port, there might be multiple
> and heterogeneous cables attached at the same time. Besides the state
> (Attached or Detached) of each cable may alter independently. Such extcon
> devices that support simultaneous mult-cable attachment include, bot not
> limited to, docks, cradles, and 30-pin-like ports (like that of NURI board
> in linux/arch/arm/mach-exynos, which resembles Samsung Galaxy Tab series).
> For example, the 30-pin port of NURI board may be used to connect analog
> audio cables, analog video cable, and a USB or a charger. Because such
> cables coonnect part of the 30 pins to external devices/cables, the
> possible combinations of external devices/cables vary significantly and
> users may fabricate their own design; e.g., an 30-pin adaptor connecting
> USB, AC-DC adaptor, HDMI, analog audio, analog video, USB-host, SD-card,
> and so on.
>
> In order to address such issues, Android kernel's "Switch" class seems to
> be a good basis and we have implemented "Multistate Switch Class" based on
> it. The "Switch" class code of Android kernel is GPL as well.
>
>
> Though there can be synchronization delay (up to 12hours), you can see
> the extcon-for-next branch at
> http://git.infradead.org/users/kmpark/linux-samsung/shortlog/refs/heads/extcon-for-next
>
> Along with the 6 patches (1/6 ... 6/6), there is one additional RFC patch
> that suggests to remove drivers/staging/android/switch.
>
> Summary of changes from v6 patchset
> - Added documentation, "porting guide for Android switch device drivers"
> - Usage of class_compat to create /sys/class/switch/* along with
> /sys/class/extcon/* if CONFIG_ANDROID is enabled. However, we cannot
> enable "switch" class_compat if CONFIG_ANDROID_SWITCH is enabled because
> we cannot create two classes with the same name.
>
> Summary of changes from v5 patchset
> - Excluded adc-jack from the "default" patchset. Adc-jack will be later
> added after Extcon is finalized.
> - Sysfs style updated
> - Bugfixes after using at Exynos4412 boards with userspace processes
> - Code stype updated
>
> Summary of changes from v4 patchset
> - Bugfixes after testing at Exynos4412 boards with userspace processes
> - Added adc-jack to support 3.5-pi jack and other ADC-based cable detection
> ports.
>
> Summary of changes from v3 patchset
> - Bugfixes after testing at Exynos4412 boards.
>
> Summary of changes from v2 patchset
> - Support to express mutually exclusive set of cables
> - Revised device/class/sysfs-entries add/removal methods
> - Added sysfs entries
> - Revised documentation and comments
> - Some bugfixes
> - Compatible with Android (for extcon devices with "use_class_name_switch" set)
>
> Summary of changes from RFC
> - ABI documentation added
> - Notifees may get notified for a state change of a specific cable, not
> every cable of the corresponding extcon.
> - Added kerneldoc comments
> - Moved to /drivers/extcon/
> - Added helper functions
> - Some bugfixes
>
> Donggeun Kim (1):
> Extcon: support notification based on the state changes.
>
> MyungJoo Ham (5):
> Extcon (external connector): import Android's switch class and
> modify.
> Extcon: support generic GPIO extcon driver
> Extcon: support multiple states at a device.
> Extcon: support mutually exclusive relation between cables.
> Documentation/extcon: porting guide for Android kernel switch driver.
>
> Documentation/ABI/testing/sysfs-class-extcon | 97 +++
> Documentation/extcon/porting-android-switch-class | 124 +++
> drivers/Kconfig | 2 +
> drivers/Makefile | 1 +
> drivers/extcon/Kconfig | 35 +
> drivers/extcon/Makefile | 6 +
> drivers/extcon/extcon_class.c | 822 +++++++++++++++++++++
> drivers/extcon/extcon_gpio.c | 175 +++++
> include/linux/extcon.h | 322 ++++++++
> include/linux/extcon/extcon_gpio.h | 52 ++
> 10 files changed, 1636 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/ABI/testing/sysfs-class-extcon
> create mode 100644 Documentation/extcon/porting-android-switch-class
> create mode 100644 drivers/extcon/Kconfig
> create mode 100644 drivers/extcon/Makefile
> create mode 100644 drivers/extcon/extcon_class.c
> create mode 100644 drivers/extcon/extcon_gpio.c
> create mode 100644 include/linux/extcon.h
> create mode 100644 include/linux/extcon/extcon_gpio.h
>
> --
> 1.7.4.1
>
--
MyungJoo Ham, Ph.D.
System S/W Lab, S/W Center, Samsung Electronics
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