diff options
Diffstat (limited to 'drivers/rtc/rtc-pcap.c')
| -rw-r--r-- | drivers/rtc/rtc-pcap.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-pcap.c b/drivers/rtc/rtc-pcap.c new file mode 100644 index 000000000..8c7a98a54 --- /dev/null +++ b/drivers/rtc/rtc-pcap.c @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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 + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/mfd/ezx-pcap.h> +#include <linux/rtc.h> +#include <linux/slab.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 pcap_rtc *pcap_rtc = dev_get_drvdata(dev); + 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_time64_to_tm(secs, tm); + + return 0; +} + +static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); + unsigned long secs = rtc_tm_to_time64(&alrm->time); + u32 tod, days; + + 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 pcap_rtc *pcap_rtc = dev_get_drvdata(dev); + 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_time64_to_tm(secs, tm); + + return 0; +} + +static int pcap_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); + unsigned long secs = rtc_tm_to_time64(tm); + 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 pcap_rtc *pcap_rtc = dev_get_drvdata(dev); + + 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 const struct rtc_class_ops pcap_rtc_ops = { + .read_time = pcap_rtc_read_time, + .set_time = pcap_rtc_set_time, + .read_alarm = pcap_rtc_read_alarm, + .set_alarm = pcap_rtc_set_alarm, + .alarm_irq_enable = pcap_rtc_alarm_irq_enable, +}; + +static int __init pcap_rtc_probe(struct platform_device *pdev) +{ + struct pcap_rtc *pcap_rtc; + int timer_irq, alarm_irq; + int err = -ENOMEM; + + pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc), + GFP_KERNEL); + if (!pcap_rtc) + return err; + + pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent); + + platform_set_drvdata(pdev, pcap_rtc); + + pcap_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(pcap_rtc->rtc)) + return PTR_ERR(pcap_rtc->rtc); + + pcap_rtc->rtc->ops = &pcap_rtc_ops; + pcap_rtc->rtc->range_max = (1 << 14) * 86400ULL - 1; + + timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ); + alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA); + + err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0, + "RTC Timer", pcap_rtc); + if (err) + return err; + + err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0, + "RTC Alarm", pcap_rtc); + if (err) + return err; + + return devm_rtc_register_device(pcap_rtc->rtc); +} + +static int __exit pcap_rtc_remove(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver pcap_rtc_driver = { + .remove = __exit_p(pcap_rtc_remove), + .driver = { + .name = "pcap-rtc", + }, +}; + +module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe); + +MODULE_DESCRIPTION("Motorola pcap rtc driver"); +MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>"); +MODULE_LICENSE("GPL"); |