From d8a82543fd2c951ec17f980f7c1c259090ddfde3 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Sat, 24 Sep 2016 13:31:21 +0100
Subject: tty: serial_mctrl_gpio: add wakeup support for serial control gpios

Allow serial control GPIOs to be used as a wakeup source for the system.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/tty/serial/serial_mctrl_gpio.c | 19 +++++++++++++++++++
 drivers/tty/serial/serial_mctrl_gpio.h | 22 ++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index fb4781292d40..3e3e05d5daee 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -299,4 +299,23 @@ void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
 }
 EXPORT_SYMBOL_GPL(mctrl_gpio_disable_ms);
 
+int mctrl_gpio_enable_wake(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx)
+{
+	int ret = -EINVAL;
+
+	if (gidx < UART_GPIO_MAX && gpios->irq[gidx])
+		ret = enable_irq_wake(gpios->irq[gidx]);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_enable_wake);
+
+void mctrl_gpio_disable_wake(struct mctrl_gpios *gpios,
+			     enum mctrl_gpio_idx gidx)
+{
+	if (gidx < UART_GPIO_MAX && gpios->irq[gidx])
+		disable_irq_wake(gpios->irq[gidx]);
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_disable_wake);
+
 MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/serial_mctrl_gpio.h b/drivers/tty/serial/serial_mctrl_gpio.h
index b134a0ffc894..e2c1fb48207d 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.h
+++ b/drivers/tty/serial/serial_mctrl_gpio.h
@@ -91,6 +91,17 @@ void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios);
  */
 void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios);
 
+/*
+ * Enable wakeup due to state change on the gpio
+ */
+int mctrl_gpio_enable_wake(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx);
+
+/*
+ * Disable wakeup due to state change on the gpio
+ */
+void mctrl_gpio_disable_wake(struct mctrl_gpios *gpios,
+			     enum mctrl_gpio_idx gidx);
+
 #else /* GPIOLIB */
 
 static inline
@@ -142,6 +153,17 @@ static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
 {
 }
 
+static inline int mctrl_gpio_enable_wake(struct mctrl_gpios *gpios,
+					 enum mctrl_gpio_idx gidx)
+{
+	return 0;
+}
+
+static inline void mctrl_gpio_disable_wake(struct mctrl_gpios *gpios,
+					   enum mctrl_gpio_idx gidx)
+{
+}
+
 #endif /* GPIOLIB */
 
 #endif
-- 
cgit