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rtc: driver for PCAP2 PMIC
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[ospite@studenti.unina.it: get pcap data from the parent device]
Signed-off-by: guiming zhuo <gmzhuo@gmail.com>
Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Daniel Ribeiro authored and Linus Torvalds committed Sep 23, 2009
1 parent 88413e1 commit d3c7a3f
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7 changes: 7 additions & 0 deletions drivers/rtc/Kconfig
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Expand Up @@ -820,4 +820,11 @@ config RTC_DRV_STMP
This driver can also be built as a module. If so, the module
will be called rtc-stmp3xxx.

config RTC_DRV_PCAP
tristate "PCAP RTC"
depends on EZX_PCAP
help
If you say Y here you will get support for the RTC found on
the PCAP2 ASIC used on some Motorola phones.

endif # RTC_CLASS
1 change: 1 addition & 0 deletions drivers/rtc/Makefile
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Expand Up @@ -54,6 +54,7 @@ obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
obj-$(CONFIG_RTC_DRV_PCAP) += rtc-pcap.o
obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
obj-$(CONFIG_RTC_DRV_PCF2123) += rtc-pcf2123.o
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224 changes: 224 additions & 0 deletions drivers/rtc/rtc-pcap.c
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@@ -0,0 +1,224 @@
/*
* 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");

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