From e49bd7bdea873ec11db79d97dd8aebad3f69164d Mon Sep 17 00:00:00 2001
From: John Klug <john.klug@multitech.com>
Date: Tue, 20 Oct 2020 10:53:55 -0500
Subject: Add radio-enable, the cellular power supply control

---
 io-module/machine/mtcap.c | 81 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 79 insertions(+), 2 deletions(-)

(limited to 'io-module/machine')

diff --git a/io-module/machine/mtcap.c b/io-module/machine/mtcap.c
index f701e93..99e1999 100644
--- a/io-module/machine/mtcap.c
+++ b/io-module/machine/mtcap.c
@@ -74,7 +74,7 @@ static struct gpio_pin gpio_pins_mtcap_0_0[] = {
 		.name = "GNSS_RESET",
 		.pin = {
 			.gpio = AT91_PIN_PD15,
-			.flags = GPIOF_OUT_INIT_LOW, 
+			.flags = GPIOF_OUT_INIT_LOW,
 			.label = "gnss-reset",
 		},
 		.capability = CAPA_GPS,
@@ -117,6 +117,23 @@ static struct gpio_pin gpio_pins_mtcap_0_0[] = {
 		},
 		.capability = CAPA_SUPERCAP,
 	},
+        /* Cellular power supply */
+	{
+		.name = "RADIO_ENABLE_BBREG",
+		.pin = {
+			.gpio = AT91_PIN_PB12, // Radio Buck Boost
+			.flags = GPIOF_OUT_INIT_HIGH,
+			.label = "radio-enable-bbreg",
+		},
+	},
+	{
+		.name = "RADIO_ENABLE_LDOREG",
+		.pin = {
+			.gpio = AT91_PIN_PB11, // Radio LDO
+			.flags = GPIOF_OUT_INIT_HIGH,
+			.label = "radio-enable-ldoreg",
+		},
+	},
 	/* LEDs */
 	{
 		.name = "STATUS_LED", // DEV_LED_GN
@@ -403,6 +420,36 @@ static ssize_t mts_attr_store_radio_power_mtcap(struct device *dev,
 	return count;
 }
 
+/* bb and ldo do not exist at the same time, so set both together */
+static ssize_t mts_attr_store_radio_enable_mtcap(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	int value;
+	int err;
+	struct gpio_pin *enable_pin_bb = gpio_pin_by_attr_name("radio-enable-bbreg");
+        struct gpio_pin *enable_pin_ldo = gpio_pin_by_attr_name("radio-enable-ldoreg");
+
+	if (sscanf(buf, "%i", &value) != 1) {
+            return -EINVAL;
+	}
+
+	mutex_lock(&mts_io_mutex);
+	if (value == 0) {
+            gpio_set_value(enable_pin_bb->pin.gpio, 0);
+            gpio_set_value(enable_pin_ldo->pin.gpio, 0);
+	} else {
+            gpio_set_value(enable_pin_bb->pin.gpio, 1);
+            gpio_set_value(enable_pin_ldo->pin.gpio, 1);
+	}
+	mutex_unlock(&mts_io_mutex);
+
+	if (err) {
+            return err;
+	}
+
+	return count;
+}
+
 static ssize_t mts_attr_store_radio_reset_mtcap(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
@@ -468,6 +515,30 @@ static ssize_t mts_attr_show_radio_power_mtcap(struct device *dev,
 	return sprintf(buf, "%d\n", value);
 }
 
+static ssize_t mts_attr_show_radio_enable_mtcap(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	int value;
+	struct gpio_pin *enable_pin_bb = gpio_pin_by_attr_name("radio-enable-bbreg");
+	struct gpio_pin *enable_pin_ldo = gpio_pin_by_attr_name("radio-enable-ldoreg");
+
+	if ( !enable_pin_bb ) {
+		return -ENODEV;
+	}
+	if ( !enable_pin_ldo ) {
+		return -ENODEV;
+	}
+
+
+	value = gpio_get_value(enable_pin_bb->pin.gpio);
+	value += (gpio_get_value(enable_pin_ldo->pin.gpio) * 2);
+
+
+	return sprintf(buf, "%d\n", value);
+}
+
+
 static DEVICE_ATTR_MTS(dev_attr_radio_reset_mtcap, "radio-reset",
 		mts_attr_show_gpio_pin, mts_attr_store_radio_reset_mtcap);
 
@@ -529,7 +600,6 @@ static struct attribute_group mtcap_0_0_platform_attribute_group = {
 	.attrs = mtcap_0_0_platform_attributes
 };
 
-
 //
 // on-board LORA attributes are to be stored in the lora/ sub-directory
 //
@@ -593,12 +663,19 @@ static DEVICE_ATTR_RO_MTS(dev_attr_supercap_power_fail_mtcap, "power-fail",
 static DEVICE_ATTR_RO_MTS(dev_attr_supercap_supercap_full_mtcap, "supercap-full",
 	mts_attr_show_gpio_pin);
 
+static DEVICE_ATTR_MTS(dev_attr_radio_enable_mtcap, "radio-enable",
+	mts_attr_show_radio_enable_mtcap, mts_attr_store_radio_enable_mtcap);
+
 static struct attribute *mtcap_0_3_supercap_attributes[] = {
 		&dev_attr_supercap_allow_reset_mtcap.attr,
 		&dev_attr_supercap_power_fail_mtcap.attr,
 		&dev_attr_supercap_supercap_full_mtcap.attr,
 };
 
+static struct attribute *mtcap_0_2_enable_radio_attribute[] = {
+        &dev_attr_radio_enable_mtcap.attr,
+};
+
 static struct attribute *mtcap_0_0_wifi_attributes[] = {
 	&dev_attr_wlan_en_gpio_mtcap.attr,
 	&dev_attr_wlan_rst_gpio_mtcap.attr,
-- 
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