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- /* 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/slab.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 alarm_pending;
- 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]) - 1;
- 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 + 1);
- 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_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 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]);
- alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
- 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 (!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;
- alrm->pending = rtc->alarm_pending;
- 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 (!alrm->enabled)
- rtc->alarm_pending = 0;
- if (!alarm_masked || alrm->enabled)
- pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
- rtc->alarm_enabled = alrm->enabled;
- return ret;
- }
- static const 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,
- };
- static void pcf50633_rtc_irq(int irq, void *data)
- {
- struct pcf50633_rtc *rtc = data;
- rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
- rtc->alarm_pending = 1;
- }
- static int pcf50633_rtc_probe(struct platform_device *pdev)
- {
- struct pcf50633_rtc *rtc;
- rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
- if (!rtc)
- return -ENOMEM;
- rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
- platform_set_drvdata(pdev, rtc);
- rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc",
- &pcf50633_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc->rtc_dev))
- return PTR_ERR(rtc->rtc_dev);
- pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
- pcf50633_rtc_irq, rtc);
- return 0;
- }
- static int pcf50633_rtc_remove(struct platform_device *pdev)
- {
- struct pcf50633_rtc *rtc;
- rtc = platform_get_drvdata(pdev);
- pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
- return 0;
- }
- static struct platform_driver pcf50633_rtc_driver = {
- .driver = {
- .name = "pcf50633-rtc",
- },
- .probe = pcf50633_rtc_probe,
- .remove = pcf50633_rtc_remove,
- };
- module_platform_driver(pcf50633_rtc_driver);
- MODULE_DESCRIPTION("PCF50633 RTC driver");
- MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
- MODULE_LICENSE("GPL");
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