From 86003361a6b28a12f748439bd3ff8bcdba123339 Mon Sep 17 00:00:00 2001
From: Laxman Dewangan <ldewangan@nvidia.com>
Date: Wed, 30 Oct 2013 15:07:02 +0530
Subject: ARM: tegra: wakeup: add function to get wakeup irq

Add API to get irq number of wakeup source which causes
system to wakeup from LP0.

Change-Id: I3a61099bad9880f1a560d7d9477e1ff69044876b
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/304932
Reviewed-by: Automatic_Commit_Validation_User
---
 arch/arm/mach-tegra/tegra-wakeups.c | 28 ++++++++++++++++++++++++++++
 include/linux/system-wakeup.h       | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 include/linux/system-wakeup.h

diff --git a/arch/arm/mach-tegra/tegra-wakeups.c b/arch/arm/mach-tegra/tegra-wakeups.c
index 5c39dbf49155..0a7c6c43990b 100644
--- a/arch/arm/mach-tegra/tegra-wakeups.c
+++ b/arch/arm/mach-tegra/tegra-wakeups.c
@@ -18,11 +18,15 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/gpio.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/irqchip/tegra.h>
+#include <linux/system-wakeup.h>
 
 #include <mach/irqs.h>
 #include <mach/gpio-tegra.h>
@@ -148,3 +152,27 @@ int tegra_disable_wake_source(int wake)
 {
 	return tegra_set_wake_source(wake, -EINVAL);
 }
+
+int get_wakeup_reason_irq(void)
+{
+	unsigned long long wake_status = tegra_read_pmc_wake_status();
+	unsigned long long mask_ll = 1ULL;
+	int irq;
+	struct irq_desc *desc;
+	int i;
+
+	for (i = 0; i < tegra_wake_table_len; ++i) {
+		if (mask_ll & wake_status) {
+			irq = tegra_wake_to_irq(i);
+			if (!irq)
+				continue;
+			desc = irq_to_desc(irq);
+			if (!desc || !desc->action || !desc->action->name)
+				continue;
+			return irq;
+		}
+		mask_ll <<= 1;
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(get_wakeup_reason_irq);
diff --git a/include/linux/system-wakeup.h b/include/linux/system-wakeup.h
new file mode 100644
index 000000000000..a9747fc2a1aa
--- /dev/null
+++ b/include/linux/system-wakeup.h
@@ -0,0 +1,33 @@
+/*
+ * PMC interface for NVIDIA SoCs Tegra
+ *
+ * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Author: Laxman Dewangan <ldewangan@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_SYSTEM_WAKEUP_H__
+#define __LINUX_SYSTEM_WAKEUP_H__
+
+#ifdef CONFIG_PM_SLEEP
+extern int get_wakeup_reason_irq(void);
+#else
+static inline int get_wakeup_reason_irq(void)
+{
+	return -EINVAL;
+}
+#endif
+
+#endif	/* __LINUX_SYSTEM_WAKEUP_H__ */
-- 
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