tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
20struct 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 */
34struct 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 */
53struct 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
60extern int efx_i2c_check_presence(struct efx_i2c_interface *i2c, u8 device_id);
61extern int efx_i2c_fast_read(struct efx_i2c_interface *i2c,
62 u8 device_id, u8 offset,
63 u8 *data, unsigned int len);
64extern int efx_i2c_fast_write(struct efx_i2c_interface *i2c,
65 u8 device_id, u8 offset,
66 const u8 *data, unsigned int len);
67extern int efx_i2c_read(struct efx_i2c_interface *i2c,
68 u8 device_id, u8 offset, u8 *data, unsigned int len);
69extern int efx_i2c_write(struct efx_i2c_interface *i2c,
70 u8 device_id, u8 offset,
71 const u8 *data, unsigned int len);
72
73extern int efx_i2c_send_bytes(struct efx_i2c_interface *i2c, u8 device_id,
74 const u8 *bytes, unsigned int len);
75
76extern 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. */
81extern int efx_i2c_check_presence_retry(struct efx_i2c_interface *i2c,
82 u8 device_id);
83
84extern int efx_i2c_read_retry(struct efx_i2c_interface *i2c,
85 u8 device_id, u8 offset, u8 *data, unsigned int len);
86
87extern 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 */