linux-kernel - [PATCH 4/6] parisc: rtc: provide rtc_class

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Message-Id: <1456851608-3374907-5-git-send-email-arnd@arndb.de>
Date:	Tue,  1 Mar 2016 18:00:00 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Kyle McMartin <kyle@...artin.ca>, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
	linux-parisc@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
	Arnd Bergmann <arnd@...db.de>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>, linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] parisc: rtc: provide rtc_class_ops directly

The rtc-generic driver provides an architecture specific
wrapper on top of the generic rtc_class_ops abstraction,
and on pa-risc, that is implemented using an open-coded
version of rtc_time_to_tm/rtc_tm_to_time.

This changes the parisc rtc-generic device to provide its
rtc_class_ops directly, using the normal helper functions,
which makes this y2038 safe (on 32-bit) and simplifies
the implementation.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/parisc/kernel/time.c | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index 400acac0a304..176ef5c2aa82 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -12,6 +12,7 @@
  */
 #include <linux/errno.h>
 #include <linux/module.h>
+#include <linux/rtc.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/param.h>
@@ -224,11 +225,43 @@ void __init start_cpu_itimer(void)
 	per_cpu(cpu_data, cpu).it_value = next_tick;
 }
 
+static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
+{
+	struct pdc_tod tod_data;
+
+	memset(wtime, 0, sizeof(*wtime));
+	if (pdc_tod_read(&tod_data) < 0)
+		return -EOPNOTSUPP;
+
+	/* we treat tod_sec as unsigned, so this can work until year 2106 */
+	rtc_time64_to_tm(tod_data.tod_sec, &tm);
+	return rtc_valid_tm(tm);
+}
+
+static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
+{
+	time64_t secs = rtc_tm_to_time64(tm);
+
+	if (pdc_tod_set(secs, 0) < 0)
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+static const struct rtc_class_ops rtc_generic_ops = {
+	.read_time = rtc_generic_get_time,
+	.set_time = rtc_generic_set_time,
+};
+
 static int __init rtc_init(void)
 {
 	struct platform_device *pdev;
 
-	pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
+	pdev = platform_device_register_data(NULL, "rtc-generic", -1,
+					     &rtc_generic_ops,
+					     sizeof(rtc_generic_ops));
+
+
 	return PTR_ERR_OR_ZERO(pdev);
 }
 device_initcall(rtc_init);
-- 
2.7.0