rtc: driver for PCAP2 PMIC

[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>

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 8455de86e2bf6c38bab35d8070db4d18e551ebe3..3c20dae43ce25e65c77b929cdc8b77f361d584af 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -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

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 82c718bdaf10b74cc2427f2fd7a009f680cb7142..aa3fbd5517a1fd91c47778ec3ad408310193ad4c 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -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

diff --git a/drivers/rtc/rtc-pcap.c b/drivers/rtc/rtc-pcap.c
new file mode 100644 (file)
index 0000000..a99c289
--- /dev/null
+++ b/drivers/rtc/rtc-pcap.c
@@ -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");