From eb609f870b57f9f18a406819201894d298008f3e Mon Sep 17 00:00:00 2001
From: Joshua Yang <joshua.yang@hardkernel.com>
Date: Thu, 10 May 2018 17:15:44 +0900
Subject: [PATCH] ODROID C1: Enable I2C pins when the I2C module isn't loaded

Change-Id: I1b581fc1335b59bcb8565d96490d9c6fccada9ae
---
 wiringPi/odroidc1.c | 43 +++++++++++++++++++++++++++++++++----------
 wiringPi/odroidc1.h | 11 ++++++++++-
 2 files changed, 43 insertions(+), 11 deletions(-)

diff --git a/wiringPi/odroidc1.c b/wiringPi/odroidc1.c
index f4885f3..e850a4e 100755
--- a/wiringPi/odroidc1.c
+++ b/wiringPi/odroidc1.c
@@ -30,7 +30,7 @@ static const int pinToGpio[64] = {
 	116, 115,	//  2 |  3 : GPIOX.19, GPIOX.18
 	104, 102,	//  4 |  5 : GPIOX.7, GPIOX.5
 	103, 83,	//  6 |  7 : GPIOX.6, GPIOY.3
-	-1,  -1,	//  8 |  9 : GPIODV.24(I2CA_SDA), GPIODV.25(I2CA_SCL)
+	74,  75,	//  8 |  9 : GPIODV.24(I2CA_SDA), GPIODV.25(I2CA_SCL)
 	117, 118,	// 10 | 11 : GPIOX.20(SPI_CE0), GPIOX.21(SPI_CE1)
 	107, 106,	// 12 | 13 : GPIOX.10(SPI_MOSI), GPIOX.9(SPI_MISO)
 	105, -1,	// 14 | 15 : GPIOX.8(SPI_SCLK), GPIOX.16(UART_TX_B)
@@ -52,8 +52,8 @@ static const int phyToGpio[64] = {
 	// physical header pin number to native gpio number
 	-1,		//  0
 	-1,  -1,	//  1 |  2 : 3.3V, 5.0V
-	-1,  -1,	//  3 |  4 : GPIODV.24(I2CA_SDA), 5.0V
-	-1,  -1,	//  5 |  6 : GPIODV.25(I2CA_SCL), GND
+	74,  -1,	//  3 |  4 : GPIODV.24(I2CA_SDA), 5.0V
+	75,  -1,	//  5 |  6 : GPIODV.25(I2CA_SCL), GND
 	83,  -1,	//  7 |  8 : GPIOY.3, GPIOX.16(UART_TX_B)
 	-1,  -1,	//  9 | 10 : GND, GPIOX.17(UART_RX_B)
 	88,  87,	// 11 | 12 : GPIOY.8, GPIOY.7
@@ -135,6 +135,8 @@ static int gpioToGPSETReg (int pin)
 		return  GPIOX_OUTP_REG_OFFSET;
 	if (pin >= GPIOY_PIN_START && pin <= GPIOY_PIN_END)
 		return  GPIOY_OUTP_REG_OFFSET;
+	if (pin >= GPIODV_PIN_START && pin <= GPIODV_PIN_END)
+		return  GPIODV_OUTP_REG_OFFSET;
 	return	-1;
 }
 
@@ -149,6 +151,8 @@ static int gpioToGPLEVReg (int pin)
 		return  GPIOX_INP_REG_OFFSET;
 	if (pin >= GPIOY_PIN_START && pin <= GPIOY_PIN_END)
 		return  GPIOY_INP_REG_OFFSET;
+	if (pin >= GPIODV_PIN_START && pin <= GPIODV_PIN_END)
+		return  GPIODV_INP_REG_OFFSET;
 	return	-1;
 }
 
@@ -163,6 +167,8 @@ static int gpioToPUENReg (int pin)
 		return  GPIOX_PUEN_REG_OFFSET;
 	if (pin >= GPIOY_PIN_START && pin <= GPIOY_PIN_END)
 		return  GPIOY_PUEN_REG_OFFSET;
+	if (pin >= GPIODV_PIN_START && pin <= GPIODV_PIN_END)
+		return  GPIODV_PUEN_REG_OFFSET;
 	return	-1;
 }
 
@@ -177,6 +183,8 @@ static int gpioToPUPDReg (int pin)
 		return  GPIOX_PUPD_REG_OFFSET;
 	if (pin >= GPIOY_PIN_START && pin <= GPIOY_PIN_END)
 		return  GPIOY_PUPD_REG_OFFSET;
+	if (pin >= GPIODV_PIN_START && pin <= GPIODV_PIN_END)
+		return  GPIODV_PUPD_REG_OFFSET;
 	return	-1;
 }
 
@@ -191,6 +199,8 @@ static int gpioToShiftReg (int pin)
 		return  pin - GPIOX_PIN_START;
 	if (pin >= GPIOY_PIN_START && pin <= GPIOY_PIN_END)
 		return  pin - GPIOY_PIN_START;
+	if (pin >= GPIODV_PIN_START && pin <= GPIODV_PIN_END)
+		return  pin - GPIODV_PIN_START;
 	return	-1;
 }
 
@@ -205,29 +215,42 @@ static int gpioToGPFSELReg (int pin)
 		return  GPIOX_FSEL_REG_OFFSET;
 	if (pin >= GPIOY_PIN_START && pin <= GPIOY_PIN_END)
 		return  GPIOY_FSEL_REG_OFFSET;
+	if (pin >= GPIODV_PIN_START && pin <= GPIODV_PIN_END)
+		return  GPIODV_FSEL_REG_OFFSET;
 	return	-1;
 }
 /*----------------------------------------------------------------------------*/
 static int getModeToGpio (int mode, int pin)
 {
+	int retPin = -1;
+
 	switch (mode) {
 	/* Native gpio number */
 	case	MODE_GPIO:
-		return	pin;
+		retPin = pin;
+		break;
 	/* Native gpio number for sysfs */
 	case	MODE_GPIO_SYS:
-		return	lib->sysFds[pin] != -1 ? pin : -1;
+		retPin = lib->sysFds[pin] != -1 ? pin : -1;
+		break;
 	/* wiringPi number */
 	case	MODE_PINS:
-		return	pin < 64 ? pinToGpio[pin] : -1;
+		retPin = pin < 64 ? pinToGpio[pin] : -1;
+		break;
 	/* header pin number */
 	case	MODE_PHYS:
-		return	pin < 64 ? phyToGpio[pin] : -1;
-	default	:
+		retPin = pin < 64 ? phyToGpio[pin] : -1;
 		break;
+	default	:
+		msg(MSG_WARN, "%s : Unknown Mode %d\n", __func__, mode);
+		return -1;
 	}
-	msg(MSG_WARN, "%s : Unknown Mode %d\n", __func__, mode);
-	return	-1;
+
+	/* To check I2C module loaded */
+	if (moduleLoaded(AML_MODULE_I2C) && (retPin == 74 || retPin == 75))
+		return -1;
+	else
+		return retPin;
 }
 
 /*----------------------------------------------------------------------------*/
diff --git a/wiringPi/odroidc1.h b/wiringPi/odroidc1.h
index 972f86b..6b638a2 100755
--- a/wiringPi/odroidc1.h
+++ b/wiringPi/odroidc1.h
@@ -12,7 +12,10 @@
 #define ODROIDC_GPIO_MASK	(0xFFFFFF80)
 #define ODROIDC1_GPIO_BASE	0xC1108000
 
-#define GPIO_PIN_BASE		80
+#define GPIO_PIN_BASE		0
+
+#define GPIODV_PIN_START	50
+#define GPIODV_PIN_END		79
 #define GPIOY_PIN_START		80
 #define GPIOY_PIN_END		96
 #define GPIOX_PIN_START		97
@@ -30,6 +33,12 @@
 #define GPIOY_PUPD_REG_OFFSET	0x3D
 #define GPIOY_PUEN_REG_OFFSET	0x4B
 
+#define GPIODV_FSEL_REG_OFFSET	0x12
+#define GPIODV_OUTP_REG_OFFSET	0x13
+#define GPIODV_INP_REG_OFFSET	0x14
+#define GPIODV_PUPD_REG_OFFSET	0x3A
+#define GPIODV_PUEN_REG_OFFSET	0x48
+
 #ifdef __cplusplus
 extern "C" {
 #endif