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Message-Id: <1250089531-10399-5-git-send-email-s.hauer@pengutronix.de>
Date: Wed, 12 Aug 2009 17:05:30 +0200
From: Sascha Hauer <s.hauer@...gutronix.de>
To: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.arm.linux.org.uk,
Sascha Hauer <s.hauer@...gutronix.de>,
Paul Gortmaker <p_gortmaker@...oo.com>,
Alessandro Zummo <a.zummo@...ertech.it>,
rtc-linux@...glegroups.com
Subject: [PATCH 4/5] [RTC] Add Freescale MC13783 RTC driver
This driver provides support for the RTC part integrated into
the Freescale MC13783 PMIC.
changes since v1:
- use set_mmss instead of set_time
- fix __devinit / __devexit usage
- use platform_driver_probe instead of platform_driver_register
- add MODULE_ALIAS
Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Paul Gortmaker <p_gortmaker@...oo.com>
Cc: Alessandro Zummo <a.zummo@...ertech.it>
Cc: rtc-linux@...glegroups.com
---
drivers/rtc/Kconfig | 6 ++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-mc13783.c | 135 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 142 insertions(+), 0 deletions(-)
create mode 100644 drivers/rtc/rtc-mc13783.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 81adbdb..e4a242f 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -759,4 +759,10 @@ config RTC_DRV_PS3
This driver can also be built as a module. If so, the module
will be called rtc-ps3.
+config RTC_DRV_MC13783
+ depends on MFD_MC13783
+ tristate "Freescale MC13783 RTC"
+ help
+ This enables support for the Freescale MC13783 PMIC RTC
+
endif # RTC_CLASS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 3c0f2b2..0c2cea6 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o
obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
+obj-$(CONFIG_RTC_DRV_MC13783) += rtc-mc13783.o
obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c
new file mode 100644
index 0000000..dfa4702
--- /dev/null
+++ b/drivers/rtc/rtc-mc13783.c
@@ -0,0 +1,135 @@
+/*
+ * Real Time Clock driver for Freescale MC13783 PMIC
+ *
+ * (C) 2009 Sascha Hauer, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/mfd/mc13783-private.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/rtc.h>
+
+struct mc13783_rtc {
+ struct rtc_device *rtc;
+ struct mc13783 *mc13783;
+};
+
+static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+ struct mc13783_rtc *priv = dev_get_drvdata(dev);
+ unsigned int seconds, days;
+
+ seconds = secs % 86400;
+ days = secs / 86400;
+
+ mc13783_reg_write(priv->mc13783, MC13783_REG_RTC_TIME, seconds);
+ mc13783_reg_write(priv->mc13783, MC13783_REG_RTC_DAY, days);
+
+ return 0;
+}
+
+static int mc13783_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct mc13783_rtc *priv = dev_get_drvdata(dev);
+ unsigned int seconds, days1, days2;
+ unsigned long s1970;
+
+ rtc_tm_to_time(tm, &s1970);
+
+ do {
+ mc13783_reg_read(priv->mc13783, MC13783_REG_RTC_TIME, &seconds);
+ mc13783_reg_read(priv->mc13783, MC13783_REG_RTC_DAY, &days1);
+ mc13783_reg_read(priv->mc13783, MC13783_REG_RTC_DAY, &days2);
+ } while (days1 != days2);
+
+ s1970 = days1 * 86400 + seconds;
+
+ rtc_time_to_tm(s1970, tm);
+
+ return rtc_valid_tm(tm);
+}
+
+static const struct rtc_class_ops mc13783_rtc_ops = {
+ .read_time = mc13783_rtc_read_time,
+ .set_mmss = mc13783_rtc_set_mmss,
+};
+
+static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
+{
+ int err;
+ struct mc13783_rtc *priv;
+
+ priv = kzalloc(sizeof *priv, GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
+ platform_set_drvdata(pdev, priv);
+
+ priv->rtc = rtc_device_register(pdev->name,
+ &pdev->dev, &mc13783_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(priv->rtc)) {
+ err = PTR_ERR(priv->rtc);
+ goto exit_kfree;
+ }
+
+ return 0;
+
+exit_kfree:
+ kfree(priv);
+ return err;
+}
+
+static int __devexit mc13783_rtc_remove(struct platform_device *pdev)
+{
+ struct mc13783_rtc *priv = platform_get_drvdata(pdev);
+
+ rtc_device_unregister(priv->rtc);
+ platform_set_drvdata(pdev, NULL);
+
+ kfree(priv);
+
+ return 0;
+}
+
+static struct platform_driver mc13783_rtc_driver = {
+ .remove = __devexit_p(mc13783_rtc_remove),
+ .driver = {
+ .name = "mc13783-rtc",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init mc13783_rtc_init(void)
+{
+ return platform_driver_probe(&mc13783_rtc_driver, &mc13783_rtc_probe);
+}
+module_init(mc13783_rtc_init);
+
+static void __exit mc13783_rtc_exit(void)
+{
+ platform_driver_unregister(&mc13783_rtc_driver);
+}
+module_exit(mc13783_rtc_exit);
+
+
+MODULE_AUTHOR("Sascha Hauer <s.hauer@...gutronix.de>");
+MODULE_DESCRIPTION("RTC driver for Freescale MC13783 PMIC");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mc13783-rtc");
--
1.6.3.3
--
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