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/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2005 Fen Systems Ltd.
* Copyright 2006 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#ifndef EFX_I2C_DIRECT_H
#define EFX_I2C_DIRECT_H
#include "net_driver.h"
/*
* Direct control of an I2C bus
*/
struct efx_i2c_interface;
/**
* struct efx_i2c_bit_operations - I2C bus direct control methods
*
* I2C bus direct control methods.
*
* @setsda: Set state of SDA line
* @setscl: Set state of SCL line
* @getsda: Get state of SDA line
* @getscl: Get state of SCL line
* @udelay: Delay between each bit operation
* @mdelay: Delay between each byte write
*/
struct efx_i2c_bit_operations {
void (*setsda) (struct efx_i2c_interface *i2c);
void (*setscl) (struct efx_i2c_interface *i2c);
int (*getsda) (struct efx_i2c_interface *i2c);
int (*getscl) (struct efx_i2c_interface *i2c);
unsigned int udelay;
unsigned int mdelay;
};
/**
* struct efx_i2c_interface - an I2C interface
*
* An I2C interface.
*
* @efx: Attached Efx NIC
* @op: I2C bus control methods
* @sda: Current output state of SDA line
* @scl: Current output state of SCL line
*/
struct efx_i2c_interface {
struct efx_nic *efx;
struct efx_i2c_bit_operations *op;
unsigned int sda:1;
unsigned int scl:1;
};
extern int efx_i2c_check_presence(struct efx_i2c_interface *i2c, u8 device_id);
extern int efx_i2c_fast_read(struct efx_i2c_interface *i2c,
u8 device_id, u8 offset,
u8 *data, unsigned int len);
extern int efx_i2c_fast_write(struct efx_i2c_interface *i2c,
u8 device_id, u8 offset,
const u8 *data, unsigned int len);
extern int efx_i2c_read(struct efx_i2c_interface *i2c,
u8 device_id, u8 offset, u8 *data, unsigned int len);
extern int efx_i2c_write(struct efx_i2c_interface *i2c,
u8 device_id, u8 offset,
const u8 *data, unsigned int len);
extern int efx_i2c_send_bytes(struct efx_i2c_interface *i2c, u8 device_id,
const u8 *bytes, unsigned int len);
extern int efx_i2c_recv_bytes(struct efx_i2c_interface *i2c, u8 device_id,
u8 *bytes, unsigned int len);
/* Versions of the API that retry on failure. */
extern int efx_i2c_check_presence_retry(struct efx_i2c_interface *i2c,
u8 device_id);
extern int efx_i2c_read_retry(struct efx_i2c_interface *i2c,
u8 device_id, u8 offset, u8 *data, unsigned int len);
extern int efx_i2c_write_retry(struct efx_i2c_interface *i2c,
u8 device_id, u8 offset,
const u8 *data, unsigned int len);
#endif /* EFX_I2C_DIRECT_H */
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