From ab5792d49cd47a9a0967dd94e41eecd30f230e7c Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Tue, 15 Nov 2016 18:54:02 +0100
Subject: [PATCH] tools: Add option to not set flow control for btattach

---
 tools/btattach.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/tools/btattach.c b/tools/btattach.c
index 9d1868a04..5adbc8d83 100644
--- a/tools/btattach.c
+++ b/tools/btattach.c
@@ -49,7 +49,7 @@
 #include "src/shared/tty.h"
 #include "src/shared/hci.h"
 
-static int open_serial(const char *path, unsigned int speed)
+static int open_serial(const char *path, unsigned int speed, bool flowctl)
 {
 	struct termios ti;
 	int fd, saved_ldisc, ldisc = N_HCI;
@@ -78,8 +78,10 @@ static int open_serial(const char *path, unsigned int speed)
 
 	ti.c_cflag |= (speed | CLOCAL | CREAD);
 
-	/* Set flow control */
-	ti.c_cflag |= CRTSCTS;
+	if (flowctl) {
+		/* Set flow control */
+		ti.c_cflag |= CRTSCTS;
+	}
 
 	if (tcsetattr(fd, TCSANOW, &ti) < 0) {
 		perror("Failed to set serial port settings");
@@ -107,11 +109,11 @@ static void local_version_callback(const void *data, uint8_t size,
 }
 
 static int attach_proto(const char *path, unsigned int proto,
-				unsigned int speed, unsigned int flags)
+			unsigned int speed, bool flowctl, unsigned int flags)
 {
 	int fd, dev_id;
 
-	fd = open_serial(path, speed);
+	fd = open_serial(path, speed, flowctl);
 	if (fd < 0)
 		return -1;
 
@@ -191,6 +193,7 @@ static void usage(void)
 		"\t-A, --amp <device>     Attach AMP controller\n"
 		"\t-P, --protocol <proto> Specify protocol type\n"
 		"\t-S, --speed <baudrate> Specify which baudrate to use\n"
+		"\t-N, --noflowctl        Disable flow control\n"
 		"\t-h, --help             Show help options\n");
 }
 
@@ -199,6 +202,7 @@ static const struct option main_options[] = {
 	{ "amp",      required_argument, NULL, 'A' },
 	{ "protocol", required_argument, NULL, 'P' },
 	{ "speed",    required_argument, NULL, 'S' },
+	{ "noflowctl",no_argument,       NULL, 'N' },
 	{ "version",  no_argument,       NULL, 'v' },
 	{ "help",     no_argument,       NULL, 'h' },
 	{ }
@@ -226,7 +230,7 @@ static const struct {
 int main(int argc, char *argv[])
 {
 	const char *bredr_path = NULL, *amp_path = NULL, *proto = NULL;
-	bool raw_device = false;
+	bool flowctl = true, raw_device = false;
 	sigset_t mask;
 	int exit_status, count = 0, proto_id = HCI_UART_H4;
 	unsigned int speed = B115200;
@@ -234,7 +238,7 @@ int main(int argc, char *argv[])
 	for (;;) {
 		int opt;
 
-		opt = getopt_long(argc, argv, "B:A:P:S:Rvh",
+		opt = getopt_long(argc, argv, "B:A:P:S:NRvh",
 						main_options, NULL);
 		if (opt < 0)
 			break;
@@ -256,6 +260,9 @@ int main(int argc, char *argv[])
 				return EXIT_FAILURE;
 			}
 			break;
+		case 'N':
+			flowctl = false;
+			break;
 		case 'R':
 			raw_device = true;
 			break;
@@ -310,7 +317,7 @@ int main(int argc, char *argv[])
 		if (raw_device)
 			flags = (1 << HCI_UART_RAW_DEVICE);
 
-		fd = attach_proto(bredr_path, proto_id, speed, flags);
+		fd = attach_proto(bredr_path, proto_id, speed, flowctl, flags);
 		if (fd >= 0) {
 			mainloop_add_fd(fd, 0, uart_callback, NULL, NULL);
 			count++;
@@ -329,7 +336,7 @@ int main(int argc, char *argv[])
 		if (raw_device)
 			flags = (1 << HCI_UART_RAW_DEVICE);
 
-		fd = attach_proto(amp_path, proto_id, speed, flags);
+		fd = attach_proto(amp_path, proto_id, speed, flowctl, flags);
 		if (fd >= 0) {
 			mainloop_add_fd(fd, 0, uart_callback, NULL, NULL);
 			count++;
-- 
2.47.3