From 99483c244edc6501a8d217379906bbb486c0f9fd Mon Sep 17 00:00:00 2001
From: Jesse Gilles <jgilles@multitech.com>
Date: Fri, 27 Jul 2012 16:24:06 -0500
Subject: add open collector pin type, MTR radio reset/init support, fix minor
 bug

---
 io-module/mts_io.c | 48 ++++++++++++++++++++++++++++++------------------
 1 file changed, 30 insertions(+), 18 deletions(-)

diff --git a/io-module/mts_io.c b/io-module/mts_io.c
index e96360f..0220817 100644
--- a/io-module/mts_io.c
+++ b/io-module/mts_io.c
@@ -88,9 +88,11 @@ static int led_mode_status = LED_OFF;
 #define SOUT_LED_SIG3_BIT		BIT(6)
 #define SOUT_EXTSERIAL_DCD_BIT		BIT(7)
 
+// GPIO pin types:input, output, open collector (1 = input (high Z), 0 = output low)
 enum {
 	GPIO_DIR_INPUT,
 	GPIO_DIR_OUTPUT,
+	GPIO_DIR_OC,
 };
 
 struct gpio_pin {
@@ -402,7 +404,7 @@ static struct gpio_pin gpio_pins_en4_0_0[] = {
 		.name = "NETH_RST",
 		.attr_name = "eth-switch-enabled",
 		.pin = AT91_PIN_PC6,
-		.direction = GPIO_DIR_INPUT,
+		.direction = GPIO_DIR_OC,
 		.output_value = 1,
 		.use_pullup = 0,
 	},
@@ -586,7 +588,7 @@ static struct gpio_pin gpio_pins_mtr_0_0[] = {
 		.name = "3G_RST",
 		.attr_name = "radio-reset",
 		.pin = AT91_PIN_PA22,
-		.direction = GPIO_DIR_OUTPUT,
+		.direction = GPIO_DIR_OC,
 		.output_value = 1,
 		.use_pullup = 0,
 	},
@@ -594,7 +596,7 @@ static struct gpio_pin gpio_pins_mtr_0_0[] = {
 		.name = "3G_ONOFF",
 		.attr_name = "radio-enabled",
 		.pin = AT91_PIN_PA21,
-		.direction = GPIO_DIR_OUTPUT,
+		.direction = GPIO_DIR_OC,
 		.output_value = 1,
 		.use_pullup = 0,
 	},
@@ -727,7 +729,7 @@ struct gpio_pin *gpio_pin_by_name(const char *name) {
 struct gpio_pin *gpio_pin_by_attr_name(const char *name) {
 	struct gpio_pin *pin;
 
-	for (pin = gpio_pins; pin->attr_name; pin++) {
+	for (pin = gpio_pins; *pin->attr_name; pin++) {
 		if (!strcmp(pin->attr_name, name)) {
 			return pin;
 		}
@@ -1233,15 +1235,6 @@ static struct device_attribute dev_attr_wlan_enabled = {
 	.store = mts_attr_store_gpio_pin,
 };
 
-static struct device_attribute dev_attr_radio_enabled = {
-	.attr = {
-		.name = "radio-enabled",
-		.mode = MTS_ATTR_MODE_RW,
-	},
-	.show = mts_attr_show_gpio_pin,
-	.store = mts_attr_store_gpio_pin,
-};
-
 static ssize_t mts_attr_store_sout(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
@@ -2422,7 +2415,7 @@ static struct device_attribute dev_attr_serial_mode = {
 	.store = mts_attr_store_serial_mode,
 };
 
-static ssize_t mts_attr_store_eth_switch_en(struct device *dev,
+static ssize_t mts_attr_store_gpio_open_collector(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	int value;
@@ -2462,7 +2455,25 @@ static struct device_attribute dev_attr_eth_switch_enabled = {
 		.mode = MTS_ATTR_MODE_RW,
 	},
 	.show = mts_attr_show_gpio_pin,
-	.store = mts_attr_store_eth_switch_en,
+	.store = mts_attr_store_gpio_open_collector,
+};
+
+static struct device_attribute dev_attr_radio_reset_oc = {
+	.attr = {
+		.name = "radio-reset",
+		.mode = MTS_ATTR_MODE_RW,
+	},
+	.show = mts_attr_show_gpio_pin,
+	.store = mts_attr_store_gpio_open_collector,
+};
+
+static struct device_attribute dev_attr_radio_enabled_oc = {
+	.attr = {
+		.name = "radio-enabled",
+		.mode = MTS_ATTR_MODE_RW,
+	},
+	.show = mts_attr_show_gpio_pin,
+	.store = mts_attr_store_gpio_open_collector,
 };
 
 static struct attribute *mt100eocg_platform_attributes[] = {
@@ -2604,8 +2615,8 @@ static struct attribute_group platform_attribute_group = {
 static struct attribute *mtr_platform_attributes[] = {
 	&dev_attr_reset.attr,
 	&dev_attr_reset_monitor.attr,
-	&dev_attr_radio_reset.attr,
-	&dev_attr_radio_enabled.attr,
+	&dev_attr_radio_reset_oc.attr,
+	&dev_attr_radio_enabled_oc.attr,
 	&dev_attr_extserial_dtr.attr,
 	&dev_attr_extserial_dsr_gpio.attr,
 	&dev_attr_extserial_cd.attr,
@@ -2901,7 +2912,8 @@ static int __init mts_io_init(void)
 	for (pin = gpio_pins; *pin->name; pin++) {
 		gpio_request(pin->pin, pin->name);
 
-		if (pin->direction == GPIO_DIR_OUTPUT) {
+		if (pin->direction == GPIO_DIR_OUTPUT || 
+			(pin->direction == GPIO_DIR_OC && pin->output_value == 0) ) {
 			at91_set_gpio_output_with_pullup(pin->pin, pin->output_value, pin->use_pullup);
 		} else {
 			at91_set_gpio_input(pin->pin, pin->use_pullup);
-- 
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