[rtc-linux] Re: [PATCH 6/6] rtc: rv3029: add alarm IRQ

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

On 21/04/2016 at 20:24:19 +0200, Myl=C4=8Dne Josserand wrote :
> @@ -731,11 +786,9 @@ static void rv3029_hwmon_register(struct device *dev=
, const char *name)
> =20
>  #endif /* CONFIG_RTC_DRV_RV3029_HWMON */
> =20
> -static const struct rtc_class_ops rv3029_rtc_ops =3D {
> +static struct rtc_class_ops rv3029_rtc_ops =3D {
>  	.read_time	=3D rv3029_read_time,
>  	.set_time	=3D rv3029_set_time,
> -	.read_alarm	=3D rv3029_read_alarm,
> -	.set_alarm	=3D rv3029_set_alarm,
>  };
> =20
>  static struct i2c_device_id rv3029_id[] =3D {
> @@ -772,8 +825,27 @@ static int rv3029_probe(struct device *dev, struct r=
egmap *regmap, int irq,
> =20
>  	rv3029->rtc =3D devm_rtc_device_register(dev, name, &rv3029_rtc_ops,
>  					       THIS_MODULE);
> +	if (IS_ERR(rv3029->rtc)) {
> +		dev_err(dev, "unable to register the class device\n");
> +		return PTR_ERR(rv3029->rtc);
> +	}
> =20
> -	return PTR_ERR_OR_ZERO(rv3029->rtc);
> +	if (rv3029->irq > 0) {
> +		rc =3D devm_request_threaded_irq(dev, rv3029->irq,
> +					       NULL, rv3029_handle_irq,
> +					       IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> +					       "rv3029", dev);
> +		if (rc) {
> +			dev_warn(dev, "unable to request IRQ, alarms disabled\n");
> +			rv3029->irq =3D 0;
> +		} else {
> +			rv3029_rtc_ops.read_alarm =3D rv3029_read_alarm;
> +			rv3029_rtc_ops.set_alarm =3D rv3029_set_alarm;
> +			rv3029_rtc_ops.alarm_irq_enable =3D rv3029_alarm_irq_enable;
> +		}
> +	}
> +

While this work, devm_rtc_device_register() needs to know whether the
alarms are enabled and will try to call .read_alarm(). That is not
completely an issue right now and as we discussed, I'm planning to send
a rework of the rtc core to overcome that issue.

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

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