linux-kernel - Re: [PATCH V2 5/6] rtc: rv3029: fix alarm support

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Message-ID: <20160503082505.GD2335@piout.net>
Date:	Tue, 3 May 2016 10:25:05 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Mylène Josserand 
	<mylene.josserand@...e-electrons.com>
Cc:	rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 5/6] rtc: rv3029: fix alarm support

On 29/04/2016 at 00:00:36 +0200, Mylène Josserand wrote :
> The RTC RV3029 handles different types of alarms : seconds, minutes, ...
> These alarms can be enabled or disabled individually using an AE_x bit
> which is the last bit (BIT(7)) on each alarm registers.
> 
> To prepare the alarm IRQ support, the current code enables all the alarm
> types by setting each AE_x to 1.
> It also fixes others alarms issues :
>    - month and weekday errors : it was performing -1 instead of +1.
>    - wrong use of bit mask with bin2bcd
> 
> Signed-off-by: Mylène Josserand <mylene.josserand@...e-electrons.com>
> ---
>  drivers/rtc/rtc-rv3029c2.c | 25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
> index cf8d465..916bbc2 100644
> --- a/drivers/rtc/rtc-rv3029c2.c
> +++ b/drivers/rtc/rtc-rv3029c2.c
> @@ -76,6 +76,7 @@
>  #define RV3029_A_DW			0x14
>  #define RV3029_A_MO			0x15
>  #define RV3029_A_YR			0x16
> +#define RV3029_A_AE_X			BIT(7)
>  #define RV3029_ALARM_SECTION_LEN	0x07
>  
>  /* timer section */
> @@ -436,14 +437,22 @@ static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
>  		dev_err(dev, "%s: reading SR failed\n", __func__);
>  		return -EIO;
>  	}
> -	regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec & 0x7f);
> -	regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min & 0x7f);
> -	regs[RV3029_A_HR - RV3029_A_SC] = bin2bcd(tm->tm_hour & 0x3f);
> -	regs[RV3029_A_DT - RV3029_A_SC] = bin2bcd(tm->tm_mday & 0x3f);
> -	regs[RV3029_A_MO - RV3029_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1);
> -	regs[RV3029_A_DW - RV3029_A_SC] = bin2bcd((tm->tm_wday & 7) - 1);
> -	regs[RV3029_A_YR - RV3029_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100);
>  
> +	/* Activate all the alarms with AE_x bit */
> +	regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
> +	regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
> +	regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
> +		| RV3029_A_AE_X;
> +	regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
> +		| RV3029_A_AE_X;
> +	regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
> +		| RV3029_A_AE_X;
> +	regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
> +		| RV3029_A_AE_X;
> +	regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
> +		| RV3029_A_AE_X;
> +
> +	/* Write the alarm */
>  	ret = rv3029_write_regs(dev, RV3029_A_SC, regs,
>  				RV3029_ALARM_SECTION_LEN);
>  	if (ret < 0)
> @@ -493,7 +502,7 @@ static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
>  	regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
>  	regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
>  	regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
> -	regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd((tm->tm_wday & 7) + 1);
> +	regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;

This may go in a separate patch.

>  	regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
>  
>  	ret = rv3029_write_regs(dev, RV3029_W_SEC, regs,
> -- 
> 2.8.0.rc3
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com