| /* 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]) - 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_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 || alrm->enabled) |
| pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); |
| rtc->alarm_enabled = alrm->enabled; |
| |
| 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"); |
| |