/* * pcap rtc code for Motorola EZX phones * * Copyright (c) 2008 guiming zhuo <gmzhuo@gmail.com> * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com> * * Based on Motorola's rtc.c Copyright (c) 2003-2005 Motorola * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/mfd/ezx-pcap.h> #include <linux/rtc.h> #include <linux/platform_device.h> struct pcap_rtc { struct pcap_chip *pcap; struct rtc_device *rtc; }; static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc) { struct pcap_rtc *pcap_rtc = _pcap_rtc; unsigned long rtc_events; if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ)) rtc_events = RTC_IRQF | RTC_UF; else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA)) rtc_events = RTC_IRQF | RTC_AF; else rtc_events = 0; rtc_update_irq(pcap_rtc->rtc, 1, rtc_events); return IRQ_HANDLED; } static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct platform_device *pdev = to_platform_device(dev); struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); struct rtc_time *tm = &alrm->time; unsigned long secs; u32 tod; /* time of day, seconds since midnight */ u32 days; /* days since 1/1/1970 */ ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod); secs = tod & PCAP_RTC_TOD_MASK; ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days); secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY; rtc_time_to_tm(secs, tm); return 0; } static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct platform_device *pdev = to_platform_device(dev); struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); struct rtc_time *tm = &alrm->time; unsigned long secs; u32 tod, days; rtc_tm_to_time(tm, &secs); tod = secs % SEC_PER_DAY; ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod); days = secs / SEC_PER_DAY; ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days); return 0; } static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct platform_device *pdev = to_platform_device(dev); struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); unsigned long secs; u32 tod, days; ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod); secs = tod & PCAP_RTC_TOD_MASK; ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days); secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY; rtc_time_to_tm(secs, tm); return rtc_valid_tm(tm); } static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs) { struct platform_device *pdev = to_platform_device(dev); struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); u32 tod, days; tod = secs % SEC_PER_DAY; ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod); days = secs / SEC_PER_DAY; ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days); return 0; } static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en) { struct platform_device *pdev = to_platform_device(dev); struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); if (en) enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq)); else disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq)); return 0; } static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en) { return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en); } static int pcap_rtc_update_irq_enable(struct device *dev, unsigned int en) { return pcap_rtc_irq_enable(dev, PCAP_IRQ_1HZ, en); } static const struct rtc_class_ops pcap_rtc_ops = { .read_time = pcap_rtc_read_time, .read_alarm = pcap_rtc_read_alarm, .set_alarm = pcap_rtc_set_alarm, .set_mmss = pcap_rtc_set_mmss, .alarm_irq_enable = pcap_rtc_alarm_irq_enable, .update_irq_enable = pcap_rtc_update_irq_enable, }; static int __devinit pcap_rtc_probe(struct platform_device *pdev) { struct pcap_rtc *pcap_rtc; int timer_irq, alarm_irq; int err = -ENOMEM; pcap_rtc = kmalloc(sizeof(struct pcap_rtc), GFP_KERNEL); if (!pcap_rtc) return err; pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent); pcap_rtc->rtc = rtc_device_register("pcap", &pdev->dev, &pcap_rtc_ops, THIS_MODULE); if (IS_ERR(pcap_rtc->rtc)) { err = PTR_ERR(pcap_rtc->rtc); goto fail_rtc; } platform_set_drvdata(pdev, pcap_rtc); timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ); alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA); err = request_irq(timer_irq, pcap_rtc_irq, 0, "RTC Timer", pcap_rtc); if (err) goto fail_timer; err = request_irq(alarm_irq, pcap_rtc_irq, 0, "RTC Alarm", pcap_rtc); if (err) goto fail_alarm; return 0; fail_alarm: free_irq(timer_irq, pcap_rtc); fail_timer: rtc_device_unregister(pcap_rtc->rtc); fail_rtc: kfree(pcap_rtc); return err; } static int __devexit pcap_rtc_remove(struct platform_device *pdev) { struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ), pcap_rtc); free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA), pcap_rtc); rtc_device_unregister(pcap_rtc->rtc); kfree(pcap_rtc); return 0; } static struct platform_driver pcap_rtc_driver = { .remove = __devexit_p(pcap_rtc_remove), .driver = { .name = "pcap-rtc", .owner = THIS_MODULE, }, }; static int __init rtc_pcap_init(void) { return platform_driver_probe(&pcap_rtc_driver, pcap_rtc_probe); } static void __exit rtc_pcap_exit(void) { platform_driver_unregister(&pcap_rtc_driver); } module_init(rtc_pcap_init); module_exit(rtc_pcap_exit); MODULE_DESCRIPTION("Motorola pcap rtc driver"); MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>"); MODULE_LICENSE("GPL");