rtc: PCF50633 rtc driver
Signed-off-by: Balaji Rao <balajirrao@openmoko.org>
Cc: Andy Green <andy@openmoko.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: Paul Gortmaker <a.zummo@towertech.it>
Cc: rtc-linux@googlegroups.com
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
diff --git a/drivers/rtc/rtc-pcf50633.c b/drivers/rtc/rtc-pcf50633.c
new file mode 100644
index 0000000..f4dd87e
--- /dev/null
+++ b/drivers/rtc/rtc-pcf50633.c
@@ -0,0 +1,344 @@
+/* NXP PCF50633 RTC Driver
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * Author: Balaji Rao <balajirrao@openmoko.org>
+ * All rights reserved.
+ *
+ * Broken down from monstrous PCF50633 driver mainly by
+ * Harald Welte, Andy Green and Werner Almesberger
+ *
+ * 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/err.h>
+
+#include <linux/mfd/pcf50633/core.h>
+
+#define PCF50633_REG_RTCSC 0x59 /* Second */
+#define PCF50633_REG_RTCMN 0x5a /* Minute */
+#define PCF50633_REG_RTCHR 0x5b /* Hour */
+#define PCF50633_REG_RTCWD 0x5c /* Weekday */
+#define PCF50633_REG_RTCDT 0x5d /* Day */
+#define PCF50633_REG_RTCMT 0x5e /* Month */
+#define PCF50633_REG_RTCYR 0x5f /* Year */
+#define PCF50633_REG_RTCSCA 0x60 /* Alarm Second */
+#define PCF50633_REG_RTCMNA 0x61 /* Alarm Minute */
+#define PCF50633_REG_RTCHRA 0x62 /* Alarm Hour */
+#define PCF50633_REG_RTCWDA 0x63 /* Alarm Weekday */
+#define PCF50633_REG_RTCDTA 0x64 /* Alarm Day */
+#define PCF50633_REG_RTCMTA 0x65 /* Alarm Month */
+#define PCF50633_REG_RTCYRA 0x66 /* Alarm Year */
+
+enum pcf50633_time_indexes {
+ PCF50633_TI_SEC,
+ PCF50633_TI_MIN,
+ PCF50633_TI_HOUR,
+ PCF50633_TI_WKDAY,
+ PCF50633_TI_DAY,
+ PCF50633_TI_MONTH,
+ PCF50633_TI_YEAR,
+ PCF50633_TI_EXTENT /* always last */
+};
+
+struct pcf50633_time {
+ u_int8_t time[PCF50633_TI_EXTENT];
+};
+
+struct pcf50633_rtc {
+ int alarm_enabled;
+ int second_enabled;
+
+ struct pcf50633 *pcf;
+ struct rtc_device *rtc_dev;
+};
+
+static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
+{
+ rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
+ rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
+ rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
+ rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
+ rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
+ rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]);
+ rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
+}
+
+static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
+{
+ pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
+ pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
+ pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
+ pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
+ pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
+ pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon);
+ pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
+}
+
+static int
+pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
+ int err;
+
+ if (enabled)
+ err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+ else
+ err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+ if (err < 0)
+ return err;
+
+ rtc->alarm_enabled = enabled;
+
+ return 0;
+}
+
+static int
+pcf50633_rtc_update_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
+ int err;
+
+ if (enabled)
+ err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
+ else
+ err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
+
+ if (err < 0)
+ return err;
+
+ rtc->second_enabled = enabled;
+
+ return 0;
+}
+
+static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct pcf50633_rtc *rtc;
+ struct pcf50633_time pcf_tm;
+ int ret;
+
+ rtc = dev_get_drvdata(dev);
+
+ ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
+ PCF50633_TI_EXTENT,
+ &pcf_tm.time[0]);
+ if (ret != PCF50633_TI_EXTENT) {
+ dev_err(dev, "Failed to read time\n");
+ return -EIO;
+ }
+
+ dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
+ pcf_tm.time[PCF50633_TI_DAY],
+ pcf_tm.time[PCF50633_TI_MONTH],
+ pcf_tm.time[PCF50633_TI_YEAR],
+ pcf_tm.time[PCF50633_TI_HOUR],
+ pcf_tm.time[PCF50633_TI_MIN],
+ pcf_tm.time[PCF50633_TI_SEC]);
+
+ pcf2rtc_time(tm, &pcf_tm);
+
+ dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
+ tm->tm_mday, tm->tm_mon, tm->tm_year,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ return rtc_valid_tm(tm);
+}
+
+static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct pcf50633_rtc *rtc;
+ struct pcf50633_time pcf_tm;
+ int second_masked, alarm_masked, ret = 0;
+
+ rtc = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
+ tm->tm_mday, tm->tm_mon, tm->tm_year,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ rtc2pcf_time(&pcf_tm, tm);
+
+ dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
+ pcf_tm.time[PCF50633_TI_DAY],
+ pcf_tm.time[PCF50633_TI_MONTH],
+ pcf_tm.time[PCF50633_TI_YEAR],
+ pcf_tm.time[PCF50633_TI_HOUR],
+ pcf_tm.time[PCF50633_TI_MIN],
+ pcf_tm.time[PCF50633_TI_SEC]);
+
+
+ second_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_SECOND);
+ alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
+
+ if (!second_masked)
+ pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
+ if (!alarm_masked)
+ pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+ /* Returns 0 on success */
+ ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
+ PCF50633_TI_EXTENT,
+ &pcf_tm.time[0]);
+
+ if (!second_masked)
+ pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
+ if (!alarm_masked)
+ pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+ return ret;
+}
+
+static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct pcf50633_rtc *rtc;
+ struct pcf50633_time pcf_tm;
+ int ret = 0;
+
+ rtc = dev_get_drvdata(dev);
+
+ alrm->enabled = rtc->alarm_enabled;
+
+ ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
+ PCF50633_TI_EXTENT, &pcf_tm.time[0]);
+ if (ret != PCF50633_TI_EXTENT) {
+ dev_err(dev, "Failed to read time\n");
+ return -EIO;
+ }
+
+ pcf2rtc_time(&alrm->time, &pcf_tm);
+
+ return rtc_valid_tm(&alrm->time);
+}
+
+static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct pcf50633_rtc *rtc;
+ struct pcf50633_time pcf_tm;
+ int alarm_masked, ret = 0;
+
+ rtc = dev_get_drvdata(dev);
+
+ rtc2pcf_time(&pcf_tm, &alrm->time);
+
+ /* do like mktime does and ignore tm_wday */
+ pcf_tm.time[PCF50633_TI_WKDAY] = 7;
+
+ alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
+
+ /* disable alarm interrupt */
+ if (!alarm_masked)
+ pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+ /* Returns 0 on success */
+ ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
+ PCF50633_TI_EXTENT, &pcf_tm.time[0]);
+
+ if (!alarm_masked)
+ pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+ return ret;
+}
+
+static struct rtc_class_ops pcf50633_rtc_ops = {
+ .read_time = pcf50633_rtc_read_time,
+ .set_time = pcf50633_rtc_set_time,
+ .read_alarm = pcf50633_rtc_read_alarm,
+ .set_alarm = pcf50633_rtc_set_alarm,
+ .alarm_irq_enable = pcf50633_rtc_alarm_irq_enable,
+ .update_irq_enable = pcf50633_rtc_update_irq_enable,
+};
+
+static void pcf50633_rtc_irq(int irq, void *data)
+{
+ struct pcf50633_rtc *rtc = data;
+
+ switch (irq) {
+ case PCF50633_IRQ_ALARM:
+ rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
+ break;
+ case PCF50633_IRQ_SECOND:
+ rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
+ break;
+ }
+}
+
+static int __devinit pcf50633_rtc_probe(struct platform_device *pdev)
+{
+ struct pcf50633_subdev_pdata *pdata;
+ struct pcf50633_rtc *rtc;
+
+
+ rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
+ if (!rtc)
+ return -ENOMEM;
+
+ pdata = pdev->dev.platform_data;
+ rtc->pcf = pdata->pcf;
+ platform_set_drvdata(pdev, rtc);
+ rtc->rtc_dev = rtc_device_register("pcf50633-rtc", &pdev->dev,
+ &pcf50633_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(rtc->rtc_dev)) {
+ kfree(rtc);
+ return PTR_ERR(rtc->rtc_dev);
+ }
+
+ pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
+ pcf50633_rtc_irq, rtc);
+ pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_SECOND,
+ pcf50633_rtc_irq, rtc);
+
+ return 0;
+}
+
+static int __devexit pcf50633_rtc_remove(struct platform_device *pdev)
+{
+ struct pcf50633_rtc *rtc;
+
+ rtc = platform_get_drvdata(pdev);
+
+ pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
+ pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_SECOND);
+
+ rtc_device_unregister(rtc->rtc_dev);
+ kfree(rtc);
+
+ return 0;
+}
+
+static struct platform_driver pcf50633_rtc_driver = {
+ .driver = {
+ .name = "pcf50633-rtc",
+ },
+ .probe = pcf50633_rtc_probe,
+ .remove = __devexit_p(pcf50633_rtc_remove),
+};
+
+static int __init pcf50633_rtc_init(void)
+{
+ return platform_driver_register(&pcf50633_rtc_driver);
+}
+module_init(pcf50633_rtc_init);
+
+static void __exit pcf50633_rtc_exit(void)
+{
+ platform_driver_unregister(&pcf50633_rtc_driver);
+}
+module_exit(pcf50633_rtc_exit);
+
+MODULE_DESCRIPTION("PCF50633 RTC driver");
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_LICENSE("GPL");
+