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