From b922a96ae3c6fb7e117923512108a4b3056469c1 Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Mon, 24 Jun 2002 10:34:24 +0000
Subject: Added functions for exclusive I2C access

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1144 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/i2c.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'firmware/drivers/i2c.c')

diff --git a/firmware/drivers/i2c.c b/firmware/drivers/i2c.c
index 5aa822e83b..ccd11e01de 100644
--- a/firmware/drivers/i2c.c
+++ b/firmware/drivers/i2c.c
@@ -41,6 +41,18 @@
 /* arbitrary delay loop */
 #define DELAY   do { int _x; for(_x=0;_x<20;_x++);} while (0)
 
+static struct mutex i2c_mtx;
+
+void i2c_begin(void)
+{
+    mutex_lock(&i2c_mtx);
+}
+
+void i2c_end(void)
+{
+    mutex_unlock(&i2c_mtx);
+}
+
 void i2c_start(void)
 {
     SDA_OUTPUT;
-- 
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