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Date:	Tue, 06 Oct 2015 12:11:15 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Roger Quadros <rogerq@...com>, Chanwoo Choi <cwchoi00@...il.com>,
	linux-kernel@...r.kernel.org
Cc:	k.kozlowski@...sung.com, ramakrishna.pallala@...el.com,
	gregkh@...uxfoundation.org, ckeepax@...nsource.wolfsonmicro.com,
	rf@...nsource.wolfsonmicro.com,
	patches@...nsource.wolfsonmicro.com, myungjoo.ham@...sung.com
Subject: Re: [PATCH] extcon: Modify the id and name of external connector

Roger,

On 2015년 10월 05일 19:49, Roger Quadros wrote:
> Chanwoo,
> 
> On 05/10/15 12:04, Chanwoo Choi wrote:
>> Hi Roger,
>>
>> On 2015년 10월 05일 18:01, Chanwoo Choi wrote:
>>> Hi Roger,
>>>
>>> On 2015년 10월 05일 17:26, Roger Quadros wrote:
>>>> Chanwoo,
>>>>
>>>> On 04/10/15 06:45, Chanwoo Choi wrote:
>>>>> This patch modifies the id and name of external connector with the additional
>>>>> prefix to clarify both attribute and meaning of external connector as following:
>>>>> - EXTCON_CHG_* mean the charger connector.
>>>>> - EXTCON_JACK_* mean the jack connector.
>>>>> - EXTCON_DISP_* mean the display port connector.
>>>>>
>>>>> Following table show the new name of external connector with old name:
>>>>> -------------------------------------------------
>>>>> Old extcon name         | New extcon name       |
>>>>> -------------------------------------------------
>>>>> EXTCON_TA               | EXTCON_CHG_USB_DCP    |
>>>>> EXTCON_FAST_CHARGER     | EXTCON_CHG_USB_FAST   |
>>>>> EXTCON_SLOW_CHARGER     | EXTCON_CHG_USB_SLOW   |
>>>>> EXTCON_CHARGE_DOWNSTREAM| EXTCON_CHG_USB_CDP    |
>>>>> -------------------------------------------------
>>>>> EXTCON_MICROPHONE       | EXTCON_JACK_MICROPHONE|
>>>>> EXTCON_HEADPHONE        | EXTCON_JACK_HEADPHONE |
>>>>> EXTCON_LINE_IN          | EXTCON_JACK_LINE_IN   |
>>>>> EXTCON_LINE_OUT         | EXTCON_JACK_LINE_OUT  |
>>>>> EXTCON_VIDEO_IN         | EXTCON_JACK_VIDEO_IN  |
>>>>> EXTCON_VIDEO_OUT        | EXTCON_JACK_VIDEO_OUT |
>>>>> EXTCON_SPDIF_IN         | EXTCON_JACK_SPDIF_IN  |
>>>>> EXTCON_SPDIF_OUT        | EXTCON_JACK_SPDIF_OUT |
>>>>> -------------------------------------------------
>>>>> EXTCON_HMDI             | EXTCON_DISP_HDMI      |
>>>>> EXTCON_MHL              | EXTCON_DISP_MHL       |
>>>>> EXTCON_DVI              | EXTCON_DISP_DVI       |
>>>>> EXTCON_VGA              | EXTCON_DISP_VGA       |
>>>>> -------------------------------------------------
>>>>>
>>>>> And, when altering the name of USB charger connector, EXTCON refers to the
>>>>> "USB battery charging specification"[1] to use the standard name of USB
>>>>> charging port as following. Following name of USB charging port are already used
>>>>> in power_supply subsystem. We chan check it on patch[2].
>>>>> - EXTCON_CHG_USB	/* Standard Downstream Port */
>>>>> - EXTCON_CHG_USB_DCP	/* Dedicated Charging Port */
>>>>> - EXTCON_CHG_USB_CDP	/* Charging Downstream Port */
>>>>> - EXTCON_CHG_USB_ACA	/* Accessory Charging Adapter */
>>>>>
>>>>> [1] http://www.usb.org/developers/docs/devclass_docs/USB_Battery_Charging_1.2.pdf
>>>>> [2] commit 85efc8a18ce ("[PATCH] power_supply: Add types for USB chargers")
>>>>>
>>>>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>>>>> ---
>>>>>  drivers/extcon/extcon-arizona.c  | 18 ++++++------
>>>>>  drivers/extcon/extcon-axp288.c   | 12 ++++----
>>>>>  drivers/extcon/extcon-max14577.c | 18 ++++++------
>>>>>  drivers/extcon/extcon-max77693.c | 32 +++++++++++----------
>>>>>  drivers/extcon/extcon-max77843.c | 27 ++++++++++--------
>>>>>  drivers/extcon/extcon-max8997.c  | 21 +++++++-------
>>>>>  drivers/extcon/extcon-rt8973a.c  |  4 +--
>>>>>  drivers/extcon/extcon-sm5502.c   |  4 +--
>>>>>  drivers/extcon/extcon.c          | 60 ++++++++++++++++++++-------------------
>>>>>  include/linux/extcon.h           | 61 +++++++++++++++++++++++-----------------
>>>>>  10 files changed, 138 insertions(+), 119 deletions(-)
>>>>>
>>>>
>>>> <snip>
>>>>
>>>>> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
>>>>> index 8dd0af1..505a028 100644
>>>>> --- a/drivers/extcon/extcon.c
>>>>> +++ b/drivers/extcon/extcon.c
>>>>> @@ -39,37 +39,39 @@
>>>>>  #define CABLE_NAME_MAX		30
>>>>>  
>>>>>  static const char *extcon_name[] =  {
>>>>> -	[EXTCON_NONE]		= "NONE",
>>>>> +	[EXTCON_NONE]		= "EXTCON_NONE",
>>>>>  
>>>>>  	/* USB external connector */
>>>>> -	[EXTCON_USB]		= "USB",
>>>>> -	[EXTCON_USB_HOST]	= "USB-HOST",
>>>>> -
>>>>> -	/* Charger external connector */
>>>>> -	[EXTCON_TA]		= "TA",
>>>>> -	[EXTCON_FAST_CHARGER]	= "FAST-CHARGER",
>>>>> -	[EXTCON_SLOW_CHARGER]	= "SLOW-CHARGER",
>>>>> -	[EXTCON_CHARGE_DOWNSTREAM] = "CHARGE-DOWNSTREAM",
>>>>> -
>>>>> -	/* Audio/Video external connector */
>>>>> -	[EXTCON_LINE_IN]	= "LINE-IN",
>>>>> -	[EXTCON_LINE_OUT]	= "LINE-OUT",
>>>>> -	[EXTCON_MICROPHONE]	= "MICROPHONE",
>>>>> -	[EXTCON_HEADPHONE]	= "HEADPHONE",
>>>>> -
>>>>> -	[EXTCON_HDMI]		= "HDMI",
>>>>> -	[EXTCON_MHL]		= "MHL",
>>>>> -	[EXTCON_DVI]		= "DVI",
>>>>> -	[EXTCON_VGA]		= "VGA",
>>>>> -	[EXTCON_SPDIF_IN]	= "SPDIF-IN",
>>>>> -	[EXTCON_SPDIF_OUT]	= "SPDIF-OUT",
>>>>> -	[EXTCON_VIDEO_IN]	= "VIDEO-IN",
>>>>> -	[EXTCON_VIDEO_OUT]	= "VIDEO-OUT",
>>>>> -
>>>>> -	/* Etc external connector */
>>>>> -	[EXTCON_DOCK]		= "DOCK",
>>>>> -	[EXTCON_JIG]		= "JIG",
>>>>> -	[EXTCON_MECHANICAL]	= "MECHANICAL",
>>>>> +	[EXTCON_USB]		= "EXTCON_USB",
>>>>> +	[EXTCON_USB_HOST]	= "EXTCON_USB_HOST",
>>>>> +
>>>>> +	/* Charging external connector */
>>>>> +	[EXTCON_CHG_USB]	= "EXTCON_CHG_USB",
>>>>> +	[EXTCON_CHG_USB_FAST]	= "EXTCON_CHG_USB_FAST",
>>>>> +	[EXTCON_CHG_USB_SLOW]	= "EXTCON_CHG_USB_SLOW",
>>>>
>>>> How does FAST & SLOW correlate to USB specifications?
>>>
>>> There is no specification about FAST & SLOW USB charger.
>>> Just, the datasheet of MUIC (Micro-USB Interface Circuit) device
>>> can detect the DCP (Dedicated Charging Port) and more two type charger
>>> according to current value as following:
>>>
>>> For example,
>>> max77693 MUIC device (is used on Samsung Galaxy S3)
>>> - CHG_USB_DCP: current up to 1.5A
>>> - CHG_USB_SLOW : current up to 500mA
>>> - CHG_USB_FAST : current up to 1A or 2A
>>>
>>> max77836 MUIC device (is used on Samsung gear 2)
>>> - CHG_USB_DCP: current up to 1.5A
>>> - CHG_USB_SLOW : current up to 500mA
>>> - CHG_USB_FAST : current up to 1A or 2A
>>>
>>> max77843 MUIC device (is used on Samsung Galaxy Note4)
>>> - CHG_USB_DCP: current up to 1.5A
>>> - CHG_USB_SLOW : current up to 500mA
>>> - CHG_USB_FAST : current up to 1A or 2A
>>>
>>> If MUIC device detects the some USB charger which
>>> has the more maximum current than DCP, this muic device
>>> call the FAST charger. Also, there is oppsite case for SLOW charger.
>>
>> I think that following name is more appropriate than old name.
>> - EXTCON_CHG_USB_SLOW -> EXTCON_CHG_USB_DCP_SLOW
>> - EXTCON_CHG_USB_FAST -> EXTCON_CHG_USB_DCP_FAST
>>
> 
> Yes that looks more appropriate.
> 
>>
>>>
>>>>
>>>>> +	[EXTCON_CHG_USB_DCP]	= "EXTCON_CHG_USB_DCP",
>>>>> +	[EXTCON_CHG_USB_CDP]	= "EXTCON_CHG_USB_CDP",
>>>>
>>>> What about USB ACA?
>>>
>>> ACA is "Accessory Charging Adapter". But, I didn't understand the role
>>> of ACA charger type. I'll drop ACA type on next version.
> 
> ACA is typically used by a docking station which can charge the
> embedded host (e.g. mobile phone) as well as allow connecting a
> USB peripheral to it.
> 
> The link you gave above for Battery charging spec is in fact just the compliance plan.
> The spec is actually available here
> http://www.usb.org/developers/docs/devclass_docs/BCv1.2_070312.zip

Thanks for your help and guide.

I'l look at the battery charging spec for adding the ACA.

Thanks,
Chanwoo Choi

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