From b3556e09b09136ac6b4435b2ccd1f57a13365535 Mon Sep 17 00:00:00 2001
From: Jesse Gilles <jgilles@multitech.com>
Date: Tue, 27 Jul 2010 14:38:09 -0500
Subject: add extserial-dtr

* Add ability to read DTR pin on external serial port
---
 io-module/mts_io.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'io-module')

diff --git a/io-module/mts_io.c b/io-module/mts_io.c
index 3609d1a..bc5db24 100644
--- a/io-module/mts_io.c
+++ b/io-module/mts_io.c
@@ -481,6 +481,33 @@ static struct device_attribute dev_attr_extserial_dsr = {
 	.store = store_extserial_dsr,
 };
 
+static ssize_t show_extserial_dtr(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	int value;
+
+	mutex_lock(&mts_io_mutex);
+
+	value = !at91_get_gpio_value(GPIO_DTR1);
+
+	mutex_unlock(&mts_io_mutex);
+
+	if (value < 0) {
+		return value;
+	}
+
+	return sprintf(buf, "%d\n", value);
+}
+
+static struct device_attribute dev_attr_extserial_dtr = {
+	.attr = {
+		.name = "extserial-dtr",
+		.mode = 0444,
+	},
+	.show = show_extserial_dtr,
+};
+
 static ssize_t show_led_sig1(struct device *dev,
 			struct device_attribute *attr,
 			char *buf)
@@ -970,6 +997,7 @@ static struct attribute *platform_attributes[] = {
 	&dev_attr_extserial_dcd.attr,
 	&dev_attr_extserial_ri.attr,
 	&dev_attr_extserial_dsr.attr,
+	&dev_attr_extserial_dtr.attr,
 	&dev_attr_led_sig1.attr,
 	&dev_attr_led_sdk_c.attr,
 	&dev_attr_led_sig2.attr,
-- 
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