linux-kernel - Re: [PATCH] rtc-pcf8523: Add low battery voltage support

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Message-ID: <20121219144225.GB7837@avionic-0098.adnet.avionic-design.de>
Date:	Wed, 19 Dec 2012 15:42:26 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Jesper Nilsson <jesper.nilsson@...s.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc-pcf8523: Add low battery voltage support

On Wed, Dec 19, 2012 at 03:04:56PM +0100, Jesper Nilsson wrote:
> This patch implements reading of the battery voltage low signal for
> rtc-pcf8523.
> 
> The bit is read-only and cannot be cleared by software, so no
> clear-function is implemented.
> 
> Signed-off-by: Jesper Nilsson <jesper.nilsson@...s.com>
> ---
> diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
> index be05a64..82a9895 100644
> --- a/drivers/rtc/rtc-pcf8523.c
> +++ b/drivers/rtc/rtc-pcf8523.c
> @@ -23,6 +23,7 @@
>  #define REG_CONTROL3_PM_VDD (1 << 6) /* switch-over disabled */
>  #define REG_CONTROL3_PM_DSM (1 << 5) /* direct switching mode */
>  #define REG_CONTROL3_PM_MASK 0xe0
> +#define REG_CONTROL3_BLF (1 << 2) /* Battery low bit, read-only */

Nit: "battery" since you don't have a full sentence.

>  
>  #define REG_SECONDS  0x03
>  #define REG_SECONDS_OS (1 << 7)
> @@ -250,9 +252,29 @@ static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm)
>  	return pcf8523_start_rtc(client);
>  }
>  
> +static int pcf8523_rtc_read_vl(struct device *dev, int *vl)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	u8 value;
> +	int err;
> +
> +	err = pcf8523_read(client, REG_CONTROL3, &value);
> +	if (err < 0)
> +		return err;
> +
> +	if (value & REG_CONTROL3_BLF)
> +		*vl = 1;
> +	else
> +		*vl = 0;
> +
> +	return 0;
> +}
> +
> +

That's one blank line too much.

>  static const struct rtc_class_ops pcf8523_rtc_ops = {
> -	.read_time = pcf8523_rtc_read_time,
> -	.set_time = pcf8523_rtc_set_time,
> +	.read_time	= pcf8523_rtc_read_time,
> +	.set_time	= pcf8523_rtc_set_time,

Maybe you shouldn't reindent these, but rather adopt the existing style
instead.

> +	.read_vl	= pcf8523_rtc_read_vl,

What tree is this based on? None of the trees I have contains .read_vl
in rtc_class_ops.

Thierry

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