linux-kernel - Re: [PATCH 1/2] extcon: Use the unique id for external connector instead of string

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Date:	Fri, 15 May 2015 16:16:32 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	linux-kernel@...r.kernel.org, myungjoo.ham@...sung.com,
	k.kozlowski@...sung.com, gg@...mlogic.co.uk, kishon@...com,
	jaewon02.kim@...sung.com, rogerq@...com,
	ramakrishna.pallala@...el.com, george.cherian@...com, balbi@...com,
	aaro.koskinen@....fi
Subject: Re: [PATCH 1/2] extcon: Use the unique id for external connector
	instead of string

On Fri, May 15, 2015 at 11:31:17PM +0900, Chanwoo Choi wrote:
> This patch uses the unique id to identify the type of external connector instead
> of string name. The string name have the many potential issues. So, this patch
> defines the 'extcon' enumeration which includes all supported external connector
> on EXTCON subsystem. If new external connector is necessary, the unique id of
> new connector have to be added in 'extcon' enumeration. There are current
> supported external connector in 'enum extcon' as following:
> 
> enum extcon {
> 	EXTCON_NONE		= 0x0,	/* NONE */
> 
> 	/* USB external connector */
> 	EXTCON_USB		= 0x1,	/* USB */
> 	EXTCON_USB_HOST		= 0x2,	/* USB-HOST */
> 
> 	/* Charger external connector */
> 	EXTCON_TA		= 0x10,	/* TA */
> 	EXTCON_FAST_CHARGER	= 0x11,	/* FAST-CHARGER */
> 	EXTCON_SLOW_CHARGER	= 0x12,	/* SLOW-CHARGER */
> 	EXTCON_CHARGE_DOWNSTREAM= 0x13,	/* CHARGE-DOWNSTREAM */
> 
> 	/* Audio and video external connector */
> 	EXTCON_LINE_IN		= 0x20,	/* LINE-IN */
> 	EXTCON_LINE_OUT		= 0x21,	/* LINE-OUT */
> 	EXTCON_MICROPHONE	= 0x22,	/* MICROPHONE */
> 	EXTCON_HEADPHONE	= 0x23,	/* HEADPHONE */
> 
> 	EXTCON_HDMI		= 0x30,	/* HDMI */
> 	EXTCON_MHL		= 0x31,	/* MHL */
> 	EXTCON_DVI		= 0x32,	/* DVI */
> 	EXTCON_VGA		= 0x33,	/* VGA */
> 	EXTCON_SPDIF_IN		= 0x34,	/* SPDIF-IN */
> 	EXTCON_SPDIF_OUT	= 0x35,	/* SPDIF-OUT */
> 	EXTCON_VIDEO_IN		= 0x36,	/* VIDEO-IN */
> 	EXTCON_VIDEO_OUT	= 0x37,	/* VIDEO-OUT */
> 
> 	/* Miscellaneous external connector */
> 	EXTCON_DOCK		= 0x50,	/* DOCK */
> 	EXTCON_JIG		= 0x51,	/* JIG */
> 	EXTCON_MECHANICAL	= 0x52,	/* MECHANICAL */
> 
> 	__EXTCON_END,
> };
> 
> For exmaple in extcon-arizoan.c:
> To use unique id removes the potential issue about handling
> the inconsistent name of external connector with string.
> - Previously, use the string to register the type of arizona jack connector
> static const char *arizona_cable[] = {
> 	"Mechanical",
> 	"Microphone",
> 	"Headphone",
> 	"Line-out",
> };
> - Newly, use the unique id to register the type of arizona jack connector
> static const enum extcon arizona_cable[] = {
> 	EXTCON_MECHANICAL,
> 	EXTCON_MICROPHONE,
> 	EXTCON_HEADPHONE,
> 	EXTCON_LINE_OUT,
> 
> 	EXTCON_NONE,
> };
> 
> And this patch modify the prototype of extcon_{get|set}_cable_state_() which
> uses the 'enum extcon id' instead of 'cable_index'. Because although one more
> extcon drivers support USB cable, each extcon driver might has the differnt
> 'cable_index' for USB cable. All extcon drivers can use the unique id number
> for same external connector with modified extcon_{get|set}_cable_state_().
> 
> - Previously, use 'cable_index' on these functions:
> extcon_get_cable_state_(struct extcon_dev*, int cable_index)
> extcon_set_cable_state_(struct extcon_dev*, int cable_index, bool state)
> 
> -Newly, use 'enum extcon id' on these functions:
> extcon_get_cable_state_(struct extcon_dev*, enum extcon id)
> extcon_set_cable_state_(struct extcon_dev*, enum extcon id, bool state)
> 
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> Cc: MyungJoo Ham <myungjoo.ham@...sung.com>
> Cc: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Cc: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> Cc: Graeme Gregory <gg@...mlogic.co.uk>
> Cc: Kishon Vijay Abraham I <kishon@...com>
> Cc: Jaewon Kim <jaewon02.kim@...sung.com>
> Cc: Roger Quadros <rogerq@...com>
> Cc: Ramakrishna Pallala <ramakrishna.pallala@...el.com>
> ---

Acked-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>

Thanks,
Charles
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