Add date rtc i2c

1 files changed, 63 insertions, 0 deletions

diff --git a/include/i2c.h b/include/i2c.h
new file mode 100644
index 0000000..50b1fd0
--- /dev/null
+++ b/include/i2c.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
+ * Copyright (C) 2009 - 2013 Heiko Schocher <hs@denx.de>
+ * Changes for multibus/multiadapter I2C support.
+ *
+ * (C) Copyright 2001
+ * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * The original I2C interface was
+ *   (C) 2000 by Paolo Scaffardi (arsenio@tin.it)
+ *   AIRVENT SAM s.p.a - RIMINI(ITALY)
+ * but has been changed substantially.
+ */
+
+#ifndef _I2C_H_
+#define _I2C_H_
+
+/*
+ * Configuration items.
+ */
+/* TODO: config.h? */
+#define I2C_RXTX_LEN	128	/* maximum tx/rx buffer length */
+
+
+/*
+ * Initialization, must be called once on start up, may be called
+ * repeatedly to change the speed.
+ */
+void i2c_init(uint32_t speed);
+
+/*
+ * Probe the given I2C chip address.  Returns 0 if a chip responded,
+ * not 0 on failure.
+ */
+int i2c_probe(uint8_t chip);
+
+/*
+ * Read/Write interface:
+ *   chip:    I2C chip address, range 0..127
+ *   addr:    Memory (register) address within the chip
+ *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
+ *              memories, 0 for register type devices with only one
+ *              register)
+ *   buffer:  Where to read/write the data
+ *   len:     How many bytes to read/write
+ *
+ *   Returns: 0 on success, not 0 on failure
+ */
+int i2c_read(uint8_t chip, unsigned int addr, uint_fast8_t alen,
+				uint8_t *buffer, uint_fast8_t len);
+int i2c_write(uint8_t chip, unsigned int addr, uint_fast8_t alen,
+				uint8_t *buffer, uint_fast8_t len);
+
+/*
+ * Utility routines to read/write registers.
+ */
+uint8_t i2c_reg_read(uint8_t addr, uint8_t reg);
+
+void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val);
+
+#endif /* _I2C_H_*/