Move i2c support to common

src/common/i2c.c

@@ -0,0 +1,53 @@
+#include <common/i2c.h>
+
+int i2c_recv(uint8_t addr, uint8_t* data, int length) {
+    int res = 0;
+
+    res = i2c_start(addr, true);
+    if (res < 0) return res;
+
+    res = i2c_read(data, length);
+    if (res < 0) return res;
+
+	i2c_stop();
+
+	return res;
+}
+
+int i2c_send(uint8_t addr, uint8_t* data, int length) {
+    int res = 0;
+
+    res = i2c_start(addr, false);
+    if (res < 0) return res;
+
+    res = i2c_write(data, length);
+    if (res < 0) return res;
+
+	i2c_stop();
+
+	return res;
+}
+
+int i2c_get(uint8_t addr, uint8_t reg, uint8_t* data, int length) {
+    int res = 0;
+
+    res = i2c_start(addr, false);
+    if (res < 0) return res;
+
+    res = i2c_write(&reg, 1);
+    if (res < 0) return res;
+
+    return i2c_recv(addr, data, length);
+}
+
+int i2c_set(uint8_t addr, uint8_t reg, uint8_t* data, int length) {
+    int res = 0;
+
+    res = i2c_start(addr, false);
+    if (res < 0) return res;
+
+	res = i2c_write(&reg, 1);
+    if (res < 0) return res;
+
+    return i2c_send(addr, data, length);
+}

src/common/include/common/i2c.h

@@ -0,0 +1,35 @@
+#ifndef _COMMON_I2C_H
+#define _COMMON_I2C_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+// Start i2c transaction
+// Must be defined by arch, board, or ec
+int i2c_start(uint8_t addr, bool read);
+
+// Stop i2c transaction
+// Must be defined by arch, board, or ec
+void i2c_stop(void);
+
+// Send a byte on i2c bus
+// Must be defined by arch, board, or ec
+int i2c_write(uint8_t * data, int length);
+
+// Read bytes from bus
+// Must be defined by arch, board, or ec
+int i2c_read(uint8_t * data, int length);
+
+// Read multiple bytes from address in one transaction
+int i2c_recv(uint8_t addr, uint8_t* data, int length);
+
+// Write multiple bytes to address in one transaction
+int i2c_send(uint8_t addr, uint8_t* data, int length);
+
+// Read multiple bytes from a register in one transaction
+int i2c_get(uint8_t addr, uint8_t reg, uint8_t* data, int length);
+
+// Write multiple bytes to a register in one transaction
+int i2c_set(uint8_t addr, uint8_t reg, uint8_t* data, int length);
+
+#endif // _COMMON_I2C_H