From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: linux-rtc@vger.kernel.org,
Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 01/17] rtc: introduce features bitfield
Date: Mon, 11 Jan 2021 00:17:36 +0100 [thread overview]
Message-ID: <20210110231752.1418816-2-alexandre.belloni@bootlin.com> (raw)
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Introduce a bitfield to allow the drivers to announce the available
features for an RTC.
The main use case would be to better handle alarms, that could be present
or not or have a minute resolution or may need a correct week day to be set.
Use the newly introduced RTC_FEATURE_ALARM bit to then test whether alarms
are available instead of relying on the presence of ops->set_alarm.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/class.c | 5 +++++
drivers/rtc/interface.c | 12 ++++++------
include/linux/rtc.h | 2 ++
include/uapi/linux/rtc.h | 5 +++++
4 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 7e470fbd5e4d..03abd0aa229a 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -231,6 +231,8 @@ static struct rtc_device *rtc_allocate_device(void)
rtc->pie_timer.function = rtc_pie_update_irq;
rtc->pie_enabled = 0;
+ set_bit(RTC_FEATURE_ALARM, rtc->features);
+
return rtc;
}
@@ -386,6 +388,9 @@ int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc)
return -EINVAL;
}
+ if (!rtc->ops->set_alarm)
+ clear_bit(RTC_FEATURE_ALARM, rtc->features);
+
rtc->owner = owner;
rtc_device_get_offset(rtc);
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 794a4f036b99..dcb34c73319e 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -186,7 +186,7 @@ static int rtc_read_alarm_internal(struct rtc_device *rtc,
if (!rtc->ops) {
err = -ENODEV;
- } else if (!rtc->ops->read_alarm) {
+ } else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->read_alarm) {
err = -EINVAL;
} else {
alarm->enabled = 0;
@@ -392,7 +392,7 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
return err;
if (!rtc->ops) {
err = -ENODEV;
- } else if (!rtc->ops->read_alarm) {
+ } else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->read_alarm) {
err = -EINVAL;
} else {
memset(alarm, 0, sizeof(struct rtc_wkalrm));
@@ -436,7 +436,7 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
if (!rtc->ops)
err = -ENODEV;
- else if (!rtc->ops->set_alarm)
+ else if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
err = -EINVAL;
else
err = rtc->ops->set_alarm(rtc->dev.parent, alarm);
@@ -451,7 +451,7 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
if (!rtc->ops)
return -ENODEV;
- else if (!rtc->ops->set_alarm)
+ else if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
return -EINVAL;
err = rtc_valid_tm(&alarm->time);
@@ -531,7 +531,7 @@ int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled)
/* nothing */;
else if (!rtc->ops)
err = -ENODEV;
- else if (!rtc->ops->alarm_irq_enable)
+ else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->alarm_irq_enable)
err = -EINVAL;
else
err = rtc->ops->alarm_irq_enable(rtc->dev.parent, enabled);
@@ -843,7 +843,7 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)
static void rtc_alarm_disable(struct rtc_device *rtc)
{
- if (!rtc->ops || !rtc->ops->alarm_irq_enable)
+ if (!rtc->ops || !test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->alarm_irq_enable)
return;
rtc->ops->alarm_irq_enable(rtc->dev.parent, false);
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 568909449c13..bd611e26291d 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -141,6 +141,8 @@ struct rtc_device {
*/
unsigned long set_offset_nsec;
+ unsigned long features[BITS_TO_LONGS(RTC_FEATURE_CNT)];
+
time64_t range_min;
timeu64_t range_max;
time64_t start_secs;
diff --git a/include/uapi/linux/rtc.h b/include/uapi/linux/rtc.h
index fa9aff91cbf2..f950bff75e97 100644
--- a/include/uapi/linux/rtc.h
+++ b/include/uapi/linux/rtc.h
@@ -110,6 +110,11 @@ struct rtc_pll_info {
#define RTC_AF 0x20 /* Alarm interrupt */
#define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */
+/* feature list */
+#define RTC_FEATURE_ALARM 0
+#define RTC_FEATURE_ALARM_RES_MINUTE 1
+#define RTC_FEATURE_NEED_WEEK_DAY 2
+#define RTC_FEATURE_CNT 3
#define RTC_MAX_FREQ 8192
--
2.29.2
next prev parent reply other threads:[~2021-01-10 23:18 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-10 23:17 [PATCH 00/17] rtc: constify all rtc_class_ops Alexandre Belloni
2021-01-10 23:17 ` Alexandre Belloni [this message]
2021-01-10 23:17 ` [PATCH 02/17] rtc: pl031: use RTC_FEATURE_ALARM Alexandre Belloni
2021-01-11 22:00 ` Linus Walleij
2021-01-10 23:17 ` [PATCH 03/17] rtc: armada38x: remove armada38x_rtc_ops_noirq Alexandre Belloni
2021-01-10 23:17 ` [PATCH 04/17] rtc: cmos: remove cmos_rtc_ops_no_alarm Alexandre Belloni
2021-04-28 18:49 ` youling257
2021-04-28 20:20 ` Alexandre Belloni
2021-04-28 21:07 ` youling 257
2021-01-10 23:17 ` [PATCH 05/17] rtc: mv: remove mv_rtc_alarm_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 06/17] rtc: m48t59: remove m48t02_rtc_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 07/17] rtc: pcf2127: remove pcf2127_rtc_alrm_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 08/17] rtc: pcf85063: remove pcf85063_rtc_ops_alarm Alexandre Belloni
2021-01-10 23:17 ` [PATCH 09/17] rtc: rx8010: drop a struct rtc_class_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 10/17] rtc: pcf85363: " Alexandre Belloni
2021-01-10 23:17 ` [PATCH 11/17] rtc: m41t80: constify m41t80_rtc_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 12/17] rtc: opal: constify opal_rtc_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 13/17] rtc: rv3028: constify rv3028_rtc_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 14/17] rtc: rv3029: constify rv3029_rtc_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 15/17] rtc: rv3032: constify rv3032_rtc_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 16/17] rtc: rv8803: constify rv8803_rtc_ops Alexandre Belloni
2021-01-10 23:17 ` [PATCH 17/17] rtc: tps65910: remove tps65910_rtc_ops_noirq Alexandre Belloni
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