1 files changed, 274 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
new file mode 100644
index 0000000000..eacacd7087
--- /dev/null
+++ b/include/linux/i2c.h
@@ -0,0 +1,274 @@
+/**
+ * @file
+ *
+ * @brief RTEMS Port of Linux I2C API
+ *
+ * @ingroup I2CLinux
+ */
+
+/*
+ * Copyright (c) 2014 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _UAPI_LINUX_I2C_H
+#define _UAPI_LINUX_I2C_H
+
+#include <stdint.h>
+
+/**
+ * @defgroup I2CLinux Linux I2C User-Space API
+ *
+ * @ingroup I2C
+ *
+ * @brief RTEMS port of Linux I2C user-space API.
+ *
+ * Additional documentation is available through the Linux sources, see
+ *
+ * - /usr/src/linux/include/uapi/linux/i2c.h,
+ * - /usr/src/linux/include/uapi/linux/i2c-dev.h, and
+ * - /usr/src/linux/Documentation/i2c.
+ *
+ * @{
+ */
+
+/**
+ * @name I2C Message Flags
+ *
+ * @{
+ */
+
+/**
+ * @brief I2C message flag to indicate a 10-bit address.
+ *
+ * The controller must support this as indicated by the I2C_FUNC_10BIT_ADDR
+ * functionality.
+ *
+ * @see i2c_msg.
+ */
+#define I2C_M_TEN 0x0010
+
+/**
+ * @brief I2C message flag to indicate a read transfer (from slave to master).
+ *
+ * @see i2c_msg.
+ */
+#define I2C_M_RD 0x0001
+
+/**
+ * @brief I2C message flag to signal a stop condition even if this is not the
+ * last message.
+ *
+ * The controller must support this as indicated by the
+ * @ref I2C_FUNC_PROTOCOL_MANGLING functionality.
+ *
+ * @see i2c_msg.
+ */
+#define I2C_M_STOP 0x8000
+
+/**
+ * @brief I2C message flag to omit start condition and slave address.
+ *
+ * The controller must support this as indicated by the
+ * @ref I2C_FUNC_NOSTART functionality.
+ *
+ * @see i2c_msg.
+ */
+#define I2C_M_NOSTART 0x4000
+
+/**
+ * @brief I2C message flag to reverse the direction flag.
+ *
+ * The controller must support this as indicated by the
+ * @ref I2C_FUNC_PROTOCOL_MANGLING functionality.
+ *
+ * @see i2c_msg.
+ */
+#define I2C_M_REV_DIR_ADDR 0x2000
+
+/**
+ * @brief I2C message flag to ignore a non-acknowledge.
+ *
+ * The controller must support this as indicated by the
+ * @ref I2C_FUNC_PROTOCOL_MANGLING functionality.
+ *
+ * @see i2c_msg.
+ */
+#define I2C_M_IGNORE_NAK 0x1000
+
+/**
+ * @brief I2C message flag to omit a master acknowledge/non-acknowledge in a
+ * read transfer.
+ *
+ * The controller must support this as indicated by the
+ * @ref I2C_FUNC_PROTOCOL_MANGLING functionality.
+ *
+ * @see i2c_msg.
+ */
+#define I2C_M_NO_RD_ACK 0x0800
+
+/**
+ * @brief I2C message flag to indicate that the message data length is the
+ * first received byte.
+ *
+ * The message data buffer must be large enough to store up to 32 bytes, the
+ * initial length byte and the SMBus PEC (if used).  Initialize the message
+ * length to one.  The message length is incremented by the count of received
+ * data bytes.
+ *
+ * @see i2c_msg.
+ */
+#define I2C_M_RECV_LEN 0x0400
+
+/** @} */
+
+/**
+ * @brief I2C transfer message.
+ */
+struct i2c_msg {
+  /**
+   * @brief The slave address.
+   *
+   * In case the @ref I2C_M_TEN flag is set, then this is a 10-bit address,
+   * otherwise it is a 7-bit address.
+   */
+  uint16_t addr;
+
+  /**
+   * @brief The message flags.
+   *
+   * Valid flags are
+   * - @ref I2C_M_TEN,
+   * - @ref I2C_M_RD,
+   * - @ref I2C_M_STOP,
+   * - @ref I2C_M_NOSTART,
+   * - @ref I2C_M_REV_DIR_ADDR,
+   * - @ref I2C_M_IGNORE_NAK,
+   * - @ref I2C_M_NO_RD_ACK, and
+   * - @ref I2C_M_RECV_LEN.
+   */
+  uint16_t flags;
+
+  /**
+   * @brief The message data length in bytes.
+   */
+  uint16_t len;
+
+  /**
+   * @brief Pointer to the message data.
+   */
+  uint8_t *buf;
+};
+
+/**
+ * @name I2C Controller Functionality
+ *
+ * @{
+ */
+
+#define I2C_FUNC_I2C 0x00000001
+#define I2C_FUNC_10BIT_ADDR 0x00000002
+#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004
+#define I2C_FUNC_SMBUS_PEC 0x00000008
+#define I2C_FUNC_NOSTART 0x00000010
+#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000
+#define I2C_FUNC_SMBUS_QUICK 0x00010000
+#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
+#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
+#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
+#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
+#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
+#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
+#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
+#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
+#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
+#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000
+#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000
+
+#define I2C_FUNC_SMBUS_BYTE \
+  (I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE)
+
+#define I2C_FUNC_SMBUS_BYTE_DATA \
+  (I2C_FUNC_SMBUS_READ_BYTE_DATA | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
+
+#define I2C_FUNC_SMBUS_WORD_DATA \
+  (I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_WRITE_WORD_DATA)
+
+#define I2C_FUNC_SMBUS_BLOCK_DATA \
+  (I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
+
+#define I2C_FUNC_SMBUS_I2C_BLOCK \
+  (I2C_FUNC_SMBUS_READ_I2C_BLOCK | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
+
+#define I2C_FUNC_SMBUS_EMUL \
+  (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA \
+    | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_PROC_CALL \
+    | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | I2C_FUNC_SMBUS_I2C_BLOCK \
+    | I2C_FUNC_SMBUS_PEC)
+
+/** @} */
+
+/**
+ * @brief Maximum SMBus data block count.
+ */
+#define I2C_SMBUS_BLOCK_MAX 32
+
+/**
+ * @brief SMBus data.
+ */
+union i2c_smbus_data {
+  uint8_t byte;
+  uint16_t word;
+  uint8_t block[I2C_SMBUS_BLOCK_MAX + 2];
+};
+
+/**
+ * @name SMBus Transfer Read and Write Markers
+ *
+ * @{
+ */
+
+#define I2C_SMBUS_READ 1
+
+#define I2C_SMBUS_WRITE 0
+
+/** @} */
+
+/**
+ * @name SMBus Transaction Types
+ *
+ * @{
+ */
+
+#define I2C_SMBUS_QUICK 0
+
+#define I2C_SMBUS_BYTE 1
+
+#define I2C_SMBUS_BYTE_DATA 2
+
+#define I2C_SMBUS_WORD_DATA 3
+
+#define I2C_SMBUS_PROC_CALL 4
+
+#define I2C_SMBUS_BLOCK_DATA 5
+
+#define I2C_SMBUS_I2C_BLOCK_BROKEN 6
+
+#define I2C_SMBUS_BLOCK_PROC_CALL 7
+
+#define I2C_SMBUS_I2C_BLOCK_DATA 8
+
+/** @} */
+
+/** @} */
+
+#endif /* _UAPI_LINUX_I2C_H */