From ff5e589f76e5c90ab35c3a47dfd01d676a0b3647 Mon Sep 17 00:00:00 2001
From: Dimitry Kloper <dikloper@cisco.com>
Date: Tue, 29 Dec 2015 17:56:44 +0200
Subject: [PATCH] AVR: add support for TCGETS and TCSETS terminal controls

Sometimes I need UART to support binary data transfer, TCSETS/TCGETS allow
stwitching into binary mode.
---
 arch/avr/src/atmega/Kconfig         | 15 +++++++++++++++
 arch/avr/src/atmega/atmega_serial.c | 10 ++++++----
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/arch/avr/src/atmega/Kconfig b/arch/avr/src/atmega/Kconfig
index b2c67025f1..218c61857d 100644
--- a/arch/avr/src/atmega/Kconfig
+++ b/arch/avr/src/atmega/Kconfig
@@ -38,5 +38,20 @@ config AVR_USART1
 	select ARCH_HAVE_USART1
 
 endmenu # ATMega Peripheral Selections
+
+
+menu "Low level UART driver options"
+	depends on AVR_USART0 || AVR_USART1
+
+config SERIAL_TERMIOS
+	bool "Serial driver TERMIOS supported"
+	depends on AVR_USART0 || AVR_USART1
+	default n
+	---help---
+		Serial driver supports termios.h interfaces (tcsetattr, tcflush, etc.).
+		If this is not defined, then the terminal settings (baud, parity, etc).
+		are not configurable at runtime; serial streams cannot be flushed, etc..
+
+endmenu
 endif
 
diff --git a/arch/avr/src/atmega/atmega_serial.c b/arch/avr/src/atmega/atmega_serial.c
index c881debe25..6d2ae31589 100644
--- a/arch/avr/src/atmega/atmega_serial.c
+++ b/arch/avr/src/atmega/atmega_serial.c
@@ -561,12 +561,13 @@ static int usart1_txinterrupt(int irq, void *context)
 #ifdef CONFIG_AVR_USART0
 static int usart0_ioctl(struct file *filep, int cmd, unsigned long arg)
 {
-#if 0 /* Reserved for future growth */
+#if CONFIG_SERIAL_TERMIOS
   int ret = OK;
 
   switch (cmd)
     {
-    case xxx: /* Add commands here */
+     case TCGETS:
+     case TCSETS:
       break;
 
     default:
@@ -584,12 +585,13 @@ static int usart0_ioctl(struct file *filep, int cmd, unsigned long arg)
 #ifdef CONFIG_AVR_USART1
 static int usart1_ioctl(struct file *filep, int cmd, unsigned long arg)
 {
-#if 0 /* Reserved for future growth */
+#if CONFIG_SERIAL_TERMIOS
   int ret = OK;
 
   switch (cmd)
     {
-    case xxx: /* Add commands here */
+     case TCGETS:
+     case TCSETS:
       break;
 
     default: