drivers/net/sfc/i2c-direct.h

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005 Fen Systems Ltd.
   4  * Copyright 2006 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 #ifndef EFX_I2C_DIRECT_H
  12 #define EFX_I2C_DIRECT_H
  13
  14 #include "net_driver.h"
  15
  16 /*
  17  * Direct control of an I2C bus
  18  */
  19
  20 struct efx_i2c_interface;
  21
  22 /**
  23  * struct efx_i2c_bit_operations - I2C bus direct control methods
  24  *
  25  * I2C bus direct control methods.
  26  *
  27  * @setsda: Set state of SDA line
  28  * @setscl: Set state of SCL line
  29  * @getsda: Get state of SDA line
  30  * @getscl: Get state of SCL line
  31  * @udelay: Delay between each bit operation
  32  * @mdelay: Delay between each byte write
  33  */
  34 struct efx_i2c_bit_operations {
  35         void (*setsda) (struct efx_i2c_interface *i2c);
  36         void (*setscl) (struct efx_i2c_interface *i2c);
  37         int (*getsda) (struct efx_i2c_interface *i2c);
  38         int (*getscl) (struct efx_i2c_interface *i2c);
  39         unsigned int udelay;
  40         unsigned int mdelay;
  41 };
  42
  43 /**
  44  * struct efx_i2c_interface - an I2C interface
  45  *
  46  * An I2C interface.
  47  *
  48  * @efx: Attached Efx NIC
  49  * @op: I2C bus control methods
  50  * @sda: Current output state of SDA line
  51  * @scl: Current output state of SCL line
  52  */
  53 struct efx_i2c_interface {
  54         struct efx_nic *efx;
  55         struct efx_i2c_bit_operations *op;
  56         unsigned int sda:1;
  57         unsigned int scl:1;
  58 };
  59
  60 extern int efx_i2c_check_presence(struct efx_i2c_interface *i2c, u8 device_id);
  61 extern int efx_i2c_fast_read(struct efx_i2c_interface *i2c,
  62                              u8 device_id, u8 offset,
  63                              u8 *data, unsigned int len);
  64 extern int efx_i2c_fast_write(struct efx_i2c_interface *i2c,
  65                               u8 device_id, u8 offset,
  66                               const u8 *data, unsigned int len);
  67 extern int efx_i2c_read(struct efx_i2c_interface *i2c,
  68                         u8 device_id, u8 offset, u8 *data, unsigned int len);
  69 extern int efx_i2c_write(struct efx_i2c_interface *i2c,
  70                          u8 device_id, u8 offset,
  71                          const u8 *data, unsigned int len);
  72
  73 extern int efx_i2c_send_bytes(struct efx_i2c_interface *i2c, u8 device_id,
  74                               const u8 *bytes, unsigned int len);
  75
  76 extern int efx_i2c_recv_bytes(struct efx_i2c_interface *i2c, u8 device_id,
  77                               u8 *bytes, unsigned int len);
  78
  79
  80 /* Versions of the API that retry on failure. */
  81 extern int efx_i2c_check_presence_retry(struct efx_i2c_interface *i2c,
  82                                         u8 device_id);
  83
  84 extern int efx_i2c_read_retry(struct efx_i2c_interface *i2c,
  85                         u8 device_id, u8 offset, u8 *data, unsigned int len);
  86
  87 extern int efx_i2c_write_retry(struct efx_i2c_interface *i2c,
  88                          u8 device_id, u8 offset,
  89                          const u8 *data, unsigned int len);
  90
  91 #endif /* EFX_I2C_DIRECT_H */