devi2c: add generic i2c bus driver

1 files changed, 56 insertions, 0 deletions

diff --git a/sys/src/9/port/i2c.h b/sys/src/9/port/i2c.h
new file mode 100644
index 000000000..eebff9569
--- /dev/null
+++ b/sys/src/9/port/i2c.h
@@ -0,0 +1,56 @@
+typedef struct I2Cbus I2Cbus;
+struct I2Cbus
+{
+	char	*name;
+	int	speed;
+
+	void	*ctlr;
+	int	(*init)(I2Cbus *bus);
+	int	(*io)(I2Cbus *bus, uchar *pkt, int olen, int ilen);
+
+	int	probed;
+	QLock;
+};
+
+typedef struct I2Cdev I2Cdev;
+struct I2Cdev
+{
+	I2Cbus	*bus;
+
+	int	a10;
+	int	addr;
+	int	subaddr;
+	ulong	size;
+};
+
+/*
+ * Register busses (controllers) and devices (addresses)
+ */
+extern void addi2cbus(I2Cbus *bus);
+extern void addi2cdev(I2Cdev *dev);
+
+/*
+ * Look-up busses and devices by name and address
+ */
+extern I2Cbus* i2cbus(char *name);
+extern I2Cdev* i2cdev(I2Cbus *bus, int addr);
+
+/*
+ * generic I/O
+ */
+extern int i2cbusio(I2Cbus *bus, uchar *pkt, int olen, int ilen);
+extern int i2crecv(I2Cdev *dev, void *data, int len, vlong addr);
+extern int i2csend(I2Cdev *dev, void *data, int len, vlong addr);
+
+/*
+ * common I/O for SMbus
+ */
+extern int i2cquick(I2Cdev *dev, int rw);
+extern int i2crecvbyte(I2Cdev *dev);
+extern int i2csendbyte(I2Cdev *dev, uchar b);
+extern int i2creadbyte(I2Cdev *dev, ulong addr);
+extern int i2cwritebyte(I2Cdev *dev, ulong addr, uchar b);
+extern int i2creadword(I2Cdev *dev, ulong addr);
+extern int i2cwriteword(I2Cdev *dev, ulong addr, ushort w);
+extern vlong i2cread32(I2Cdev *dev, ulong addr);
+extern vlong i2cwrite32(I2Cdev *dev, ulong addr, ulong u);