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/* 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");
|
