commit d66c9d51b264b66f7130eb7f310f09fce4b37039
author Ashay Jaiswal <ashayj@codeaurora.org> Thu Oct 13 17:41:40 2011 +0530
committer Ashay Jaiswal <ashayj@codeaurora.org> Mon Oct 17 11:08:37 2011 +0530
tree 13dbf9d3b876b1b8031e85e8f83286ec009c1334
parent 58522b6c825ce37b9e27f8244c62c7e64e684eb6

drivers: rtc-pm8xxx: Fix automatic wakeup of APPS due to RTC alarm.

Alarm interrupt causes automatic wakeup even when the phone is in
powerdown state.

Change-Id: If3ae30304adba4f07284a3dc496956d67a1ae1b0
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>

drivers/rtc/rtc-pm8xxx.c

diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index 0bdb89e..e53374e 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -30,6 +30,8 @@
 /* RTC_CTRL register bit fields */
 #define PM8xxx_RTC_ENABLE	BIT(7)
 #define PM8xxx_RTC_ALARM_ENABLE	BIT(1)
+#define PM8xxx_RTC_ABORT_ENABLE BIT(0)
+
 #define PM8xxx_RTC_ALARM_CLEAR  BIT(0)
 
 #define NUM_8_BIT_RTC_REGS	0x4
@@ -461,6 +463,14 @@
 		}
 	}
 
+	/* Enable abort enable feature */
+	ctrl_reg |= PM8xxx_RTC_ABORT_ENABLE;
+	rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "PM8xxx write failed!\n");
+		goto fail_rtc_enable;
+	}
+
 	rtc_dd->ctrl_reg = ctrl_reg;
 	if (rtc_write_enable == true)
 		pm8xxx_rtc_ops.set_time = pm8xxx_rtc_set_time;
@@ -539,9 +549,48 @@
 	return 0;
 }
 
+static void pm8xxx_rtc_shutdown(struct platform_device *pdev)
+{
+	u8 value[4] = {0, 0, 0, 0};
+	u8 reg;
+	int rc;
+	unsigned long irq_flags;
+	bool rtc_alarm_powerup = false;
+	struct pm8xxx_rtc *rtc_dd = platform_get_drvdata(pdev);
+	struct pm8xxx_rtc_platform_data *pdata = pdev->dev.platform_data;
+
+	if (pdata != NULL)
+		rtc_alarm_powerup =  pdata->rtc_alarm_powerup;
+
+	if (!rtc_alarm_powerup) {
+
+		spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
+		dev_dbg(&pdev->dev, "Disabling alarm interrupts\n");
+
+		/* Disable RTC alarms */
+		reg = rtc_dd->ctrl_reg;
+		reg &= ~PM8xxx_RTC_ALARM_ENABLE;
+		rc = pm8xxx_write_wrapper(rtc_dd, &reg, rtc_dd->rtc_base, 1);
+		if (rc < 0) {
+			dev_err(rtc_dd->rtc_dev, "PM8xxx write failed\n");
+			goto fail_alarm_disable;
+		}
+
+		/* Clear Alarm register */
+		rc = pm8xxx_write_wrapper(rtc_dd, value,
+				rtc_dd->alarm_rw_base, NUM_8_BIT_RTC_REGS);
+		if (rc < 0)
+			dev_err(rtc_dd->rtc_dev, "PM8xxx write failed\n");
+
+fail_alarm_disable:
+		spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
+	}
+}
+
 static struct platform_driver pm8xxx_rtc_driver = {
 	.probe		= pm8xxx_rtc_probe,
 	.remove		= __devexit_p(pm8xxx_rtc_remove),
+	.shutdown	= pm8xxx_rtc_shutdown,
 	.driver	= {
 		.name	= PM8XXX_RTC_DEV_NAME,
 		.owner	= THIS_MODULE,