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Commit eae854b2 authored by Balaji Rao's avatar Balaji Rao Committed by Samuel Ortiz
Browse files

rtc: PCF50633 rtc driver 



Signed-off-by: default avatarBalaji Rao <balajirrao@openmoko.org>
Cc: Andy Green <andy@openmoko.com>
Acked-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Cc: Paul Gortmaker <a.zummo@towertech.it>
Cc: rtc-linux@googlegroups.com
Signed-off-by: default avatarSamuel Ortiz <sameo@openedhand.com>
parent 6a3d119b

drivers/rtc/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -502,6 +502,13 @@ config RTC_DRV_WM8350 
	  This driver can also be built as a module. If so, the module

	  will be called "rtc-wm8350".



config RTC_DRV_PCF50633

	depends on MFD_PCF50633

	tristate "NXP PCF50633 RTC"

	help

	  If you say yes here you get support for the RTC subsystem of the

	  NXP PCF50633 used in embedded systems.



comment "on-CPU RTC drivers"



config RTC_DRV_OMAP

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -74,3 +74,4 @@ obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o 
obj-$(CONFIG_RTC_DRV_VR41XX)	+= rtc-vr41xx.o

obj-$(CONFIG_RTC_DRV_WM8350)	+= rtc-wm8350.o

obj-$(CONFIG_RTC_DRV_X1205)	+= rtc-x1205.o

obj-$(CONFIG_RTC_DRV_PCF50633)	+= rtc-pcf50633.o

drivers/rtc/rtc-pcf50633.c

0 → 100644
+344 −0
Original line number Diff line number Diff line 
/* 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]);

	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);

	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)

		pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);



	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");