linux-kernel - Re: [PATCH v2 3/6] extcon-gpio: Add support for active-low presence detect pins

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Date:	Thu, 12 Sep 2013 08:57:09 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH v2 3/6] extcon-gpio: Add support for active-low presence
 detect pins

Hi Guenter,

As I mentioned on previous reply, I modify patch name as following:
extcon-gpio: Add support for active-low presence detect pins
->
extcon: gpio: Add support for active-low presence detect pins

I prefer you could add patch description. Also, you should test
on extcon latest branch to protect merge conflict. This patch
has conflict issue on extcon-linus branch. I fix up and applied it.

And I think you might use tab size is 4 characters. you should change tab size
from 4 characters to 8 characters. You can check linux kernel coding sytle on
"/kernel/Documentation/CodingStyle - chapter 1: Indentation".

On 09/11/2013 11:25 AM, Guenter Roeck wrote:
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> v2: Document gpio_active_low variable in gpio_extcon_platform_data
>     Rewrite active-low logic to be easier to read.
> 
>  drivers/extcon/extcon-gpio.c       |    4 ++++
>  include/linux/extcon/extcon-gpio.h |    5 +++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
> index 862743b..8491f86 100644
> --- a/drivers/extcon/extcon-gpio.c
> +++ b/drivers/extcon/extcon-gpio.c
> @@ -34,6 +34,7 @@
>  struct gpio_extcon_data {
>  	struct extcon_dev edev;
>  	unsigned gpio;
> +	bool gpio_active_low;
>  	const char *state_on;
>  	const char *state_off;
>  	int irq;
> @@ -49,6 +50,8 @@ static void gpio_extcon_work(struct work_struct *work)
>  			     work);
>  
>  	state = gpio_get_value(data->gpio);
> +	if (data->gpio_active_low)
> +		state = !state;
>  	extcon_set_state(&data->edev, state);
>  }
>  
> @@ -96,6 +99,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
>  
>  	extcon_data->edev.name = pdata->name;
>  	extcon_data->gpio = pdata->gpio;
> +	extcon_data->gpio_active_low = pdata->gpio_active_low;
>  	extcon_data->state_on = pdata->state_on;
>  	extcon_data->state_off = pdata->state_off;
>  	if (pdata->state_on && pdata->state_off)
> diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
> index 2d8307f..51ef15c 100644
> --- a/include/linux/extcon/extcon-gpio.h
> +++ b/include/linux/extcon/extcon-gpio.h
> @@ -27,6 +27,10 @@
>   * struct gpio_extcon_platform_data - A simple GPIO-controlled extcon device.
>   * @name	The name of this GPIO extcon device.
>   * @gpio	Corresponding GPIO.
> + * @gpio_active_low:
> + * 		Boolean describing whether gpio active state is 1 or 0
> + * 		If true, low state of gpio means active.
> + * 		If false, high state of gpio means active.

I think you may use tab size is 4 characters.

>   * @debounce	Debounce time for GPIO IRQ in ms.
>   * @irq_flags	IRQ Flags (e.g., IRQF_TRIGGER_LOW).
>   * @state_on	print_state is overriden with state_on if attached. If Null,
> @@ -41,6 +45,7 @@
>  struct gpio_extcon_platform_data {
>  	const char *name;
>  	unsigned gpio;
> +	bool gpio_active_low;
>  	unsigned long debounce;
>  	unsigned long irq_flags;
>  
> 

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