From ad514a44325de866e94a2704e07b102bf8eca0be Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Mon, 29 Jul 2013 10:14:12 +0200
Subject: i2cget: read 16bit ints as well

---
 commandline/i2c-util.c |  6 +++++-
 commandline/i2c-util.h |  2 +-
 commandline/i2cget.c   | 17 ++++++++++++++---
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/commandline/i2c-util.c b/commandline/i2c-util.c
index 2771a4e..44ea4d3 100644
--- a/commandline/i2c-util.c
+++ b/commandline/i2c-util.c
@@ -267,17 +267,21 @@ unsigned char i2c_tx_byte(unsigned char byte)
 	return ack;
 }
 
-unsigned char i2c_rx_byte()
+unsigned char i2c_rx_byte(unsigned char send_ack)
 {
 	signed char i;
 	unsigned char ret = 0;
 
 	set_sda(1);
 	for (i = 7; i >= -1; i--) {
+		if (( i < 0) && send_ack)
+			set_sda(0);
 		set_scl(1);
 		usleep(10);
 		if ((i >= 0) && ( get_status() & (1 << BIT_SDA)))
 			ret |= (1 << i);
+		if (( i < 0) && send_ack)
+			set_sda(1);
 		set_scl(0);
 		usleep(10);
 	}
diff --git a/commandline/i2c-util.h b/commandline/i2c-util.h
index 4cd4919..6bf13b3 100644
--- a/commandline/i2c-util.h
+++ b/commandline/i2c-util.h
@@ -11,7 +11,7 @@ void set_scl(char value);
 
 unsigned char get_status();
 unsigned char i2c_tx_byte(unsigned char byte);
-unsigned char i2c_rx_byte();
+unsigned char i2c_rx_byte(unsigned char send_ack);
 
 void i2c_start();
 void i2c_stop();
diff --git a/commandline/i2cget.c b/commandline/i2cget.c
index ed453ac..b7c0245 100644
--- a/commandline/i2cget.c
+++ b/commandline/i2cget.c
@@ -7,23 +7,34 @@
 int main(int argc, char **argv)
 {
 	int address, command;
-	unsigned char ret;
+	unsigned int ret;
+	char mode = 'c';
 
 	i2c_init();
 	i2c_start();
 
 	if (argc < 3) {
-		fputs("Usage: vusb-i2cget <address> <register>", stderr);
+		fputs("Usage: vusb-i2cget <address> <register> [mode]", stderr);
 		return 1;
 	}
 
 	address = atoi(argv[1]);
 	command = atoi(argv[2]);
+
+	if (argc == 4)
+		mode = argv[3][0];
+
 	i2c_tx_byte((address << 1) | 0);
 	i2c_tx_byte(command);
 	i2c_start();
 	i2c_tx_byte((address << 1) | 1);
-	ret = i2c_rx_byte();
+
+	if (mode == 'i') {
+		ret = i2c_rx_byte(1);
+		ret |= (i2c_rx_byte(0) << 8);
+	}
+	else
+		ret = i2c_rx_byte(0);
 
 	i2c_stop();
 	i2c_deinit();
-- 
cgit v1.2.3