[rtc-linux] Re: [PATCH 5/6] rtc: rv3029: enable AE_x bits on set_alarm

[Alexandre Belloni <alexandre.belloni@free-electrons.com>]

On 21/04/2016 at 20:24:18 +0200, Myl=C4=8Dne 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.
>=20
> To prepare the alarm IRQ support, the current code enables all the alarm
> types by setting each AE_x to 1.
> It also fixes month and weekday errors : it was performing -1 instead
> of +1.
>=20
> Signed-off-by: Myl=C4=8Dne Josserand <mylene.josserand@free-electrons.com=
>
> ---
>  drivers/rtc/rtc-rv3029c2.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
>=20
> diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
> index a849005..42de1a3 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
> =20
>  /* timer section */
> @@ -436,14 +437,22 @@ static int rv3029_set_alarm(struct device *dev, str=
uct rtc_wkalrm *alarm)
>  		dev_err(dev, "%s: reading SR failed\n", __func__);
>  		return -EIO;
>  	}
> -	regs[RV3029_A_SC - RV3029_A_SC] =3D bin2bcd(tm->tm_sec & 0x7f);
> -	regs[RV3029_A_MN - RV3029_A_SC] =3D bin2bcd(tm->tm_min & 0x7f);
> -	regs[RV3029_A_HR - RV3029_A_SC] =3D bin2bcd(tm->tm_hour & 0x3f);
> -	regs[RV3029_A_DT - RV3029_A_SC] =3D bin2bcd(tm->tm_mday & 0x3f);
> -	regs[RV3029_A_MO - RV3029_A_SC] =3D bin2bcd((tm->tm_mon & 0x1f) - 1);
> -	regs[RV3029_A_DW - RV3029_A_SC] =3D bin2bcd((tm->tm_wday & 7) - 1);
> -	regs[RV3029_A_YR - RV3029_A_SC] =3D bin2bcd((tm->tm_year & 0x7f) - 100)=
;
> =20
> +	/* Activate all the alarms with AE_x bit */
> +	regs[RV3029_A_SC - RV3029_A_SC] =3D (bin2bcd(tm->tm_sec)) | RV3029_A_AE=
_X;
> +	regs[RV3029_A_MN - RV3029_A_SC] =3D (bin2bcd(tm->tm_min)) | RV3029_A_AE=
_X;
> +	regs[RV3029_A_HR - RV3029_A_SC] =3D (bin2bcd(tm->tm_hour & 0x3f))
> +		| RV3029_A_AE_X;
> +	regs[RV3029_A_DT - RV3029_A_SC] =3D (bin2bcd(tm->tm_mday & 0x3f))
> +		| RV3029_A_AE_X;
> +	regs[RV3029_A_MO - RV3029_A_SC] =3D (bin2bcd((tm->tm_mon & 0x1f) + 1))
> +		| RV3029_A_AE_X;
> +	regs[RV3029_A_DW - RV3029_A_SC] =3D (bin2bcd((tm->tm_wday & 7) + 1))
> +		| RV3029_A_AE_X;
> +	regs[RV3029_A_YR - RV3029_A_SC] =3D (bin2bcd((tm->tm_year) - 100))
> +		| RV3029_A_AE_X;
> +

Alarms probably never worked anyway because this still suffers form
another bug:
(bin2bcd(tm->tm_hour & 0x3f)) should be (bin2bcd(tm->tm_hour) & 0x3f),
and the same for the other members.

note that (bin2bcd((tm->tm_mon & 0x1f) + 1)) must be
(bin2bcd(tm->tm_mon + 1) & 0x1f)

etc...

> +	/* Write the alarm */
>  	ret =3D rv3029_write_regs(dev, RV3029_A_SC, regs,
>  				RV3029_ALARM_SECTION_LEN);
>  	if (ret < 0)
> --=20
> 2.8.0.rc3
>=20

--=20
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

--=20
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