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>

3 files changed, 232 insertions, 0 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 8455de86e2bf..3c20dae43ce2 100644
--- 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 82c718bdaf10..aa3fbd5517a1 100644
--- 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
index 000000000000..a99c28992d21
--- /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");