diff options
Diffstat (limited to 'drivers/rtc/rtc-pcf50606.c')
| -rw-r--r-- | drivers/rtc/rtc-pcf50606.c | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-pcf50606.c b/drivers/rtc/rtc-pcf50606.c new file mode 100644 index 00000000000..5004987100d --- /dev/null +++ b/drivers/rtc/rtc-pcf50606.c @@ -0,0 +1,341 @@ +/* NXP PCF50606 RTC Driver + * + * (C) 2006-2008 by Openmoko, Inc. + * Author: Balaji Rao <balajirrao@openmoko.org> + * All rights reserved. + * + * Broken down from monstrous PCF50606 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/pcf50606/core.h> + +#define PCF50606_REG_RTCSC 0x0a /* Second */ +#define PCF50606_REG_RTCMN 0x0b /* Minute */ +#define PCF50606_REG_RTCHR 0x0c /* Hour */ +#define PCF50606_REG_RTCWD 0x0d /* Weekday */ +#define PCF50606_REG_RTCDT 0x0e /* Day */ +#define PCF50606_REG_RTCMT 0x0f /* Month */ +#define PCF50606_REG_RTCYR 0x10 /* Year */ +#define PCF50606_REG_RTCSCA 0x11 /* Alarm Second */ +#define PCF50606_REG_RTCMNA 0x12 /* Alarm Minute */ +#define PCF50606_REG_RTCHRA 0x13 /* Alarm Hour */ +#define PCF50606_REG_RTCWDA 0x14 /* Alarm Weekday */ +#define PCF50606_REG_RTCDTA 0x15 /* Alarm Day */ +#define PCF50606_REG_RTCMTA 0x16 /* Alarm Month */ +#define PCF50606_REG_RTCYRA 0x17 /* Alarm Year */ + +enum pcf50606_time_indexes { + PCF50606_TI_SEC, + PCF50606_TI_MIN, + PCF50606_TI_HOUR, + PCF50606_TI_WKDAY, + PCF50606_TI_DAY, + PCF50606_TI_MONTH, + PCF50606_TI_YEAR, + PCF50606_TI_EXTENT /* always last */ +}; + +struct pcf50606_time { + uint8_t time[PCF50606_TI_EXTENT]; +}; + +struct pcf50606_rtc { + int alarm_enabled; + int second_enabled; + int alarm_pending; + + struct pcf50606 *pcf; + struct rtc_device *rtc_dev; +}; + +static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50606_time *pcf) +{ + rtc->tm_sec = bcd2bin(pcf->time[PCF50606_TI_SEC]); + rtc->tm_min = bcd2bin(pcf->time[PCF50606_TI_MIN]); + rtc->tm_hour = bcd2bin(pcf->time[PCF50606_TI_HOUR]); + rtc->tm_wday = bcd2bin(pcf->time[PCF50606_TI_WKDAY]); + rtc->tm_mday = bcd2bin(pcf->time[PCF50606_TI_DAY]); + rtc->tm_mon = bcd2bin(pcf->time[PCF50606_TI_MONTH]) - 1; + rtc->tm_year = bcd2bin(pcf->time[PCF50606_TI_YEAR]) + 100; +} + +static void rtc2pcf_time(struct pcf50606_time *pcf, struct rtc_time *rtc) +{ + pcf->time[PCF50606_TI_SEC] = bin2bcd(rtc->tm_sec); + pcf->time[PCF50606_TI_MIN] = bin2bcd(rtc->tm_min); + pcf->time[PCF50606_TI_HOUR] = bin2bcd(rtc->tm_hour); + pcf->time[PCF50606_TI_WKDAY] = bin2bcd(rtc->tm_wday); + pcf->time[PCF50606_TI_DAY] = bin2bcd(rtc->tm_mday); + pcf->time[PCF50606_TI_MONTH] = bin2bcd(rtc->tm_mon + 1); + pcf->time[PCF50606_TI_YEAR] = bin2bcd(rtc->tm_year % 100); +} + +static int +pcf50606_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) +{ + struct pcf50606_rtc *rtc = dev_get_drvdata(dev); + + switch (cmd) { + case RTC_AIE_OFF: + rtc->alarm_enabled = 0; + pcf50606_irq_mask(rtc->pcf, PCF50606_IRQ_ALARM); + return 0; + case RTC_AIE_ON: + rtc->alarm_enabled = 1; + pcf50606_irq_unmask(rtc->pcf, PCF50606_IRQ_ALARM); + return 0; + case RTC_UIE_OFF: + rtc->second_enabled = 0; + pcf50606_irq_mask(rtc->pcf, PCF50606_IRQ_SECOND); + return 0; + case RTC_UIE_ON: + rtc->second_enabled = 1; + pcf50606_irq_unmask(rtc->pcf, PCF50606_IRQ_SECOND); + return 0; + } + + return -ENOIOCTLCMD; +} + +static int pcf50606_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct pcf50606_rtc *rtc; + struct pcf50606_time pcf_tm; + int ret; + + rtc = dev_get_drvdata(dev); + + ret = pcf50606_read_block(rtc->pcf, PCF50606_REG_RTCSC, + PCF50606_TI_EXTENT, + &pcf_tm.time[0]); + if (ret != PCF50606_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[PCF50606_TI_DAY], + pcf_tm.time[PCF50606_TI_MONTH], + pcf_tm.time[PCF50606_TI_YEAR], + pcf_tm.time[PCF50606_TI_HOUR], + pcf_tm.time[PCF50606_TI_MIN], + pcf_tm.time[PCF50606_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 pcf50606_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct pcf50606_rtc *rtc; + struct pcf50606_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[PCF50606_TI_DAY], + pcf_tm.time[PCF50606_TI_MONTH], + pcf_tm.time[PCF50606_TI_YEAR], + pcf_tm.time[PCF50606_TI_HOUR], + pcf_tm.time[PCF50606_TI_MIN], + pcf_tm.time[PCF50606_TI_SEC]); + + + second_masked = pcf50606_irq_mask_get(rtc->pcf, PCF50606_IRQ_SECOND); + alarm_masked = pcf50606_irq_mask_get(rtc->pcf, PCF50606_IRQ_ALARM); + + if (!second_masked) + pcf50606_irq_mask(rtc->pcf, PCF50606_IRQ_SECOND); + if (!alarm_masked) + pcf50606_irq_mask(rtc->pcf, PCF50606_IRQ_ALARM); + + /* Returns 0 on success */ + ret = pcf50606_write_block(rtc->pcf, PCF50606_REG_RTCSC, + PCF50606_TI_EXTENT, + &pcf_tm.time[0]); + + if (!second_masked) + pcf50606_irq_unmask(rtc->pcf, PCF50606_IRQ_SECOND); + if (!alarm_masked) + pcf50606_irq_unmask(rtc->pcf, PCF50606_IRQ_ALARM); + + return ret; +} + +static int pcf50606_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct pcf50606_rtc *rtc; + struct pcf50606_time pcf_tm; + int ret = 0; + + rtc = dev_get_drvdata(dev); + + alrm->enabled = rtc->alarm_enabled; + alrm->pending = rtc->alarm_pending; + + ret = pcf50606_read_block(rtc->pcf, PCF50606_REG_RTCSCA, + PCF50606_TI_EXTENT, &pcf_tm.time[0]); + if (ret != PCF50606_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 pcf50606_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct pcf50606_rtc *rtc; + struct pcf50606_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[PCF50606_TI_WKDAY] = 7; + + alarm_masked = pcf50606_irq_mask_get(rtc->pcf, PCF50606_IRQ_ALARM); + + /* disable alarm interrupt */ + if (!alarm_masked) + pcf50606_irq_mask(rtc->pcf, PCF50606_IRQ_ALARM); + + /* Returns 0 on success */ + ret = pcf50606_write_block(rtc->pcf, PCF50606_REG_RTCSCA, + PCF50606_TI_EXTENT, &pcf_tm.time[0]); + + if (!alrm->enabled) + rtc->alarm_pending = 0; + + if (!alarm_masked || alrm->enabled) + pcf50606_irq_unmask(rtc->pcf, PCF50606_IRQ_ALARM); + rtc->alarm_enabled = alrm->enabled; + + return ret; +} + +static struct rtc_class_ops pcf50606_rtc_ops = { + .ioctl = pcf50606_rtc_ioctl, + .read_time = pcf50606_rtc_read_time, + .set_time = pcf50606_rtc_set_time, + .read_alarm = pcf50606_rtc_read_alarm, + .set_alarm = pcf50606_rtc_set_alarm, +}; + +static void pcf50606_rtc_irq(int irq, void *data) +{ + struct pcf50606_rtc *rtc = data; + + switch (irq) { + case PCF50606_IRQ_ALARM: + rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); + rtc->alarm_pending = 1; + break; + case PCF50606_IRQ_SECOND: + rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF); + break; + } +} + +static int __devinit pcf50606_rtc_probe(struct platform_device *pdev) +{ + struct pcf50606_rtc *rtc; + + rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc->pcf = dev_to_pcf50606(pdev->dev.parent); + platform_set_drvdata(pdev, rtc); + rtc->rtc_dev = rtc_device_register("pcf50606-rtc", &pdev->dev, + &pcf50606_rtc_ops, THIS_MODULE); + + if (IS_ERR(rtc->rtc_dev)) { + kfree(rtc); + return PTR_ERR(rtc->rtc_dev); + } + + pcf50606_register_irq(rtc->pcf, PCF50606_IRQ_ALARM, + pcf50606_rtc_irq, rtc); + pcf50606_register_irq(rtc->pcf, PCF50606_IRQ_SECOND, + pcf50606_rtc_irq, rtc); + + return 0; +} + + +static int __devexit pcf50606_rtc_remove(struct platform_device *pdev) +{ + struct pcf50606_rtc *rtc; + + rtc = platform_get_drvdata(pdev); + + rtc_device_unregister(rtc->rtc_dev); + + pcf50606_free_irq(rtc->pcf, PCF50606_IRQ_ALARM); + pcf50606_free_irq(rtc->pcf, PCF50606_IRQ_SECOND); + + platform_set_drvdata(pdev, NULL); + kfree(rtc); + + return 0; +} + + +static struct platform_driver pcf50606_rtc_driver = { + .driver = { + .name = "pcf50606-rtc", + .owner = THIS_MODULE, + }, + .probe = pcf50606_rtc_probe, + .remove = __devexit_p(pcf50606_rtc_remove), +}; + +static int __init pcf50606_rtc_init(void) +{ + return platform_driver_register(&pcf50606_rtc_driver); +} +module_init(pcf50606_rtc_init); + +static void __exit pcf50606_rtc_exit(void) +{ + platform_driver_unregister(&pcf50606_rtc_driver); +} +module_exit(pcf50606_rtc_exit); + +MODULE_DESCRIPTION("PCF50606 RTC driver"); +MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); +MODULE_LICENSE("GPL"); + |