linux-kernel - Re: [PATCH v2 0/6] extcon: Add the support for extcon type and property

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Date:	Tue, 02 Aug 2016 10:52:07 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Guenter Roeck <groeck@...gle.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	myungjoo.ham@...sung.com, Chris Zhong <zyw@...k-chips.com>,
	Guenter Roeck <groeck@...omium.org>, chanwoo@...nel.org,
	"cpgs (cpgs@...sung.com)" <cpgs@...sung.com>
Subject: Re: [PATCH v2 0/6] extcon: Add the support for extcon type and property

Hi Guenter,

On 2016년 08월 02일 03:18, Guenter Roeck wrote:
> On Sun, Jul 31, 2016 at 10:50 PM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>> This patch-set add the support the extcon type, extcon property
>> and the synchronization functions.
>>
>> The each external connector has the common characters. So, the external
>> connectors are able to gather in the specific type. And the each external
>> connectors has the specific H/W desigin to support the multiple features
>> throught h/w lines. There are the requirement to express the each h/w
>> character of each external connector. Lastly, when the state and property
>> are changed, the extcon notify the extcon client driver of the changed
>> information. To support the notification on extcon provider drivers,
>> this patches support the three sync functions.
>>
>> Changes from v1:
>> - Expand the size (+1) of the property array for each extcon type.
>> - Use the memset() to initialize the property when connector is detached.
>> - Wrap the data of struct extcon_dev in the lock mechanism.
>> - Don't send the notification if connector state is not changed in
>>   extcon_set_state_sync()
>> - Fix the minor issue.
>> - Add Tested-by tag of Chris Zhong for these patches.
>> - Add Signed-off tag of Myungjoo Ham for patch1.
>> - Add Reviewed-by tag of Guenter Roeck for patch6.
>>
>> Depends on:
>> This patch depend on the extcon git repository[2]. (branch : extcon-next)
>>
> 
> For the series:
> 
> Tested-by: Guenter Roeck <groeck@...omium.org>

Thanks for your test and review.
I'll modify the minor issue of your comment. I'll send next version(v3) and then
merged patches on extcon-next branch.

Regards,
Chanwoo Choi


> 
>> [1] https://en.wikipedia.org/wiki/DisplayPort
>> [2] https://git.kernel.org/cgit/linux/kernel/git/chanwoo/extcon.git/
>>
>> [Detailed description of these patches]
>> 1. Add the extcon type to group the each external connector.
>> There are five categories unitl now as following:
>> - EXTCON_TYPE_USB  : USB connector
>> - EXTCON_TYPE_CHG  : Charger connector
>> - EXTCON_TYPE_JACK : Jack connector
>> - EXTCON_TYPE_DISP : Display connector
>> - EXTCON_TYPE_MISC : Miscellaneous connector
>>
>> 2. Add the extcon property to support the multiple characteristic
>> for the specific H/W design.
>> - EXTCON_PROP_USB_[property name]
>> - EXTCON_PROP_CHG_[property name]
>> - EXTCON_PROP_JACK_[property name]
>> - EXTCON_PROP_DISP_[property name]
>> e.g., EXTCON_PROP_USB_ID and EXTCON_PROP_USB_VBUS
>> The list of the new extcon APIs for the property as following:
>> - int extcon_get_property(struct extcon_dev *edev,
>>                         unsigned int id, unsigned int prop,
>>                         union extcon_property_value *prop_val)
>> - int extcon_set_property(struct extcon_dev *edev,
>>                         unsigned int id, unsigned int prop,
>>                         union extcon_property_value prop_val)
>> - int extcon_get_property_capability(struct extcon_dev *edev,
>>                         unsigned int id, unsigned int prop);
>> - int extcon_set_property_capability(struct extcon_dev *edev,
>>                         unsigned int id, unsigned int prop);
>>
>> 3. Add the sync functions to synchronize the data of each external connector
>> between an extcon provider driver and the extcon client drivers.
>> The list of the new extcon sync APIs as following:
>> - extcon_sync() : Send the notification for each external connector to
>>                 synchronize the information between and extcon provider driver
>>                 and the extcon client drivers.
>> - extcon_set_state_sync() : Set the state of external connector with noti.
>> - extcon_set_property_sync() : Set the property of external connector with noti.
>>
>> 4. Add the new external connector definition. The EXTCON_DISP_DP
>> means the Display external connector[1].
>> The list of new external connector as following:
>> - EXTCON_DISP_DP
>> The list of new property of USB connector as following:
>> - EXTCON_PROP_USB_TYPEC_POLARITY
>>
>> 5. Rename the renames the existing extcon_get/set_cable_state_()
>> to maintain the function naming pattern like as extcon APIs for property.
>> - extcon_set_cable_state_() -> extcon_set_state()
>> - extcon_get_cable_state_() -> extcon_get_state()
>>
>> For example,
>> case 1, change the state of external connector and synchronized the data.
>>         extcon_set_state_sync(edev, EXTCON_USB, 1);
>> case 2, change both the state and property of external connector
>>         and synchronized the data.
>>         extcon_set_state(edev, EXTCON_USB, 1);
>>         extcon_set_property(edev, EXTCON_USB, EXTCON_PROP_USB_ID, 1);
>>         extcon_set_property(edev, EXTCON_USB, EXTCON_PROP_USB_VBUS, 0);
>>         extcon_sync(edev, EXTCON_USB);
>> case 3, change the property of external connector and synchronized the data.
>>         extcon_set_property(edev, EXTCON_USB, EXTCON_PROP_USB_VBUS, 0);
>>         extcon_set_property(edev, EXTCON_USB, EXTCON_PROP_USB_ID, 1);
>>         extcon_sync(edev, EXTCON_USB);
>> case 4, change the property of external connector and synchronized the data.
>>         extcon_set_property_sync(edev, EXTCON_USB, EXTCON_PROP_USB_VBUS, 0);
>>
>>
>> Chanwoo Choi (5):
>>   extcon: Add the extcon_type to gather each connector into five category
>>   extcon: Add the support for extcon property according to extcon type
>>   extcon: Add the support for the capability of each property
>>   extcon: Rename the extcon_set/get_state() to maintain the function naming pattern
>>   extcon: Add the synchronization extcon APIs to support the notification
>>
>> Chris Zhong (1):
>>   extcon: Add EXTCON_DISP_DP and the property for USB Type-C
>>
>>  drivers/extcon/extcon.c | 730 ++++++++++++++++++++++++++++++++++++++++--------
>>  include/linux/extcon.h  | 176 +++++++++++-
>>  2 files changed, 786 insertions(+), 120 deletions(-)
>>
>> --
>> 1.9.1
>>
> 
> 
>