arch/powerpc/cpu/mpc824x/drivers/i2c_export.h

   1 #ifndef I2C_EXPORT_H
   2 #define I2C_EXPORT_H
   3
   4 /****************************************************
   5  *
   6  * Copyright Motrola 1999
   7  *
   8  ****************************************************/
   9
  10 /* These are the defined return values for the I2C_do_transaction function.
  11  * Any non-zero value indicates failure.  Failure modes can be added for
  12  * more detailed error reporting.
  13  */
  14 typedef enum _i2c_status
  15 {
  16  I2C_SUCCESS     = 0,
  17  I2C_ERROR,
  18 } I2C_Status;
  19
  20 /* These are the defined tasks for I2C_do_transaction.
  21  * Modes for SLAVE_RCV and SLAVE_XMIT will be added.
  22  */
  23 typedef enum _i2c_transaction_mode
  24 {
  25         I2C_MASTER_RCV =  0,
  26         I2C_MASTER_XMIT = 1,
  27 } I2C_TRANSACTION_MODE;
  28
  29 typedef enum _i2c_interrupt_mode
  30 {
  31         I2C_INT_DISABLE =  0,
  32         I2C_INT_ENABLE = 1,
  33 } I2C_INTERRUPT_MODE;
  34
  35 typedef enum _i2c_stop
  36 {
  37         I2C_NO_STOP =  0,
  38         I2C_STOP = 1,
  39 } I2C_STOP_MODE;
  40
  41 typedef enum _i2c_restart
  42 {
  43         I2C_NO_RESTART =  0,
  44         I2C_RESTART = 1,
  45 } I2C_RESTART_MODE;
  46
  47 /******************** App. API ********************
  48  * The application API is for user level application
  49  * to use the functionality provided by I2C driver.
  50  * This is a "generic" I2C interface, it should contain
  51  * nothing specific to the Kahlua implementation.
  52  * Only the generic functions are exported by the library.
  53  *
  54  * Note: Its App.s responsibility to swap the data
  55  *       byte. In our API, we just transfer whatever
  56  *       we are given
  57  **************************************************/
  58
  59
  60 /*  Initialize I2C unit with the following:
  61  *  driver's slave address
  62  *  interrupt enabled
  63  *  optional pointer to application layer print function
  64  *
  65  *  These parameters may be added:
  66  *  desired clock rate
  67  *  digital filter frequency sampling rate
  68  *
  69  *  This function must be called before I2C unit can be used.
  70  */
  71 extern I2C_Status I2C_Initialize(
  72         unsigned char addr,            /* driver's I2C slave address */
  73         I2C_INTERRUPT_MODE en_int,     /* 1 - enable I2C interrupt
  74                                         * 0 - disable I2C interrupt
  75                                         */
  76         int (*app_print_function)(char *,...)); /* pointer to optional "printf"
  77                                                  * provided by application
  78                                                  */
  79
  80 /* Perform the given I2C transaction, only MASTER_XMIT and MASTER_RCV
  81  * are implemented.  Both are only in polling mode.
  82  *
  83  * en_int controls interrupt/polling mode
  84  * act is the type of transaction
  85  * addr is the I2C address of the slave device
  86  * len is the length of data to send or receive
  87  * buffer is the address of the data buffer
  88  * stop = I2C_NO_STOP, don't signal STOP at end of transaction
  89  *        I2C_STOP, signal STOP at end of transaction
  90  * retry is the timeout retry value, currently ignored
  91  * rsta = I2C_NO_RESTART, this is not continuation of existing transaction
  92  *        I2C_RESTART, this is a continuation of existing transaction
  93  */
  94 extern I2C_Status I2C_do_transaction( I2C_INTERRUPT_MODE en_int,
  95                                       I2C_TRANSACTION_MODE act,
  96                                       unsigned char i2c_addr,
  97                                       unsigned char data_addr,
  98                                       int len,
  99                                       char *buffer,
 100                                       I2C_STOP_MODE stop,
 101                                       int retry,
 102                                       I2C_RESTART_MODE rsta);
 103 #endif