Patch to make LCDproc work with Chineese version of the HD44780 extender which has different wiring than the original version

hd44780-i2c-pcf8574t.c.patch

--- server/drivers/hd44780-i2c.c	2014-03-23 11:22:09.000000000 +0100
+++ server/drivers/hd44780-i2c.c	2015-12-27 00:55:15.528659000 +0100
@@ -85,10 +85,10 @@
 void i2c_HD44780_backlight(PrivateData *p, unsigned char state);
 void i2c_HD44780_close(PrivateData *p);
 
-#define RS	0x10
-#define RW	0x20
-#define EN	0x40
-#define BL	0x80
+#define RS	0x01
+#define RW	0x02
+#define EN	0x04
+#define BL	0x08
 // note that the above bits are all meant for the data port of PCF8574
 
 #define I2C_ADDR_MASK 0x7f
@@ -191,12 +191,12 @@
 
 	if (p->port & I2C_PCAX_MASK) { // we have a PCA9554 or similar, that needs special config
 		char data[2];
-		data[0] = 2; // command: set polarity inversion
+		data[0] = 2 << 4; // command: set polarity inversion
 		data[1] = 0; // -> no polarity inversion
 		if (write(p->fd,data,2) != 2) {
 			report(RPT_ERR, "HD44780: I2C: i2c set polarity inversion failed: %s", strerror(errno));
 		}
-		data[0] = 3; // command: set output direction
+		data[0] = 3 << 4; // command: set output direction
 		data[1] = 0; // -> all pins are outputs
 		if (write(p->fd,data,2) != 2) {
 			report(RPT_ERR, "HD44780: I2C: i2c set output direction failed: %s", strerror(errno));
@@ -210,43 +210,43 @@
 	// powerup the lcd now
 	/* We'll now send 0x03 a couple of times,
 	 * which is in fact (FUNCSET | IF_8BIT) >> 4 */
-	i2c_out(p, 0x03);
+	i2c_out(p, 0x30);
 	if (p->delayBus)
 		hd44780_functions->uPause(p, 1);
 
-	i2c_out(p, enableLines | 0x03);
+	i2c_out(p, enableLines | 0x30);
 	if (p->delayBus)
 		hd44780_functions->uPause(p, 1);
-	i2c_out(p, 0x03);
+	i2c_out(p, 0x30);
 	hd44780_functions->uPause(p, 15000);
 
-	i2c_out(p, enableLines | 0x03);
+	i2c_out(p, enableLines | 0x30);
 	if (p->delayBus)
 		hd44780_functions->uPause(p, 1);
-	i2c_out(p, 0x03);
+	i2c_out(p, 0x30);
 	hd44780_functions->uPause(p, 5000);
 
-	i2c_out(p, enableLines | 0x03);
+	i2c_out(p, enableLines | 0x30);
 	if (p->delayBus)
 		hd44780_functions->uPause(p, 1);
-	i2c_out(p, 0x03);
+	i2c_out(p, 0x30);
 	hd44780_functions->uPause(p, 100);
 
-	i2c_out(p, enableLines | 0x03);
+	i2c_out(p, enableLines | 0x30);
 	if (p->delayBus)
 		hd44780_functions->uPause(p, 1);
-	i2c_out(p, 0x03);
+	i2c_out(p, 0x30);
 	hd44780_functions->uPause(p, 100);
 
 	// now in 8-bit mode...  set 4-bit mode
-	i2c_out(p, 0x02);
+	i2c_out(p, 0x20);
 	if (p->delayBus)
 		hd44780_functions->uPause(p, 1);
 
-	i2c_out(p, enableLines | 0x02);
+	i2c_out(p, enableLines | 0x20);
 	if (p->delayBus)
 		hd44780_functions->uPause(p, 1);
-	i2c_out(p, 0x02);
+	i2c_out(p, 0x20);
 	hd44780_functions->uPause(p, 100);
 
 	// Set up two-line, small character (5x8) mode
@@ -280,8 +280,8 @@
 i2c_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
 {
 	unsigned char enableLines = 0, portControl = 0;
-	unsigned char h = (ch >> 4) & 0x0f;     // high and low nibbles
-	unsigned char l = ch & 0x0f;
+	unsigned char h = ch & 0xf0;     // high and low nibbles
+	unsigned char l = ch << 4;
 
 	if (flags == RS_INSTR)
 		portControl = 0;