1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/* $NetBSD: i2cvar.h,v 1.26 2022/10/24 10:17:27 riastradh Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Steve C. Woodford and Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _DEV_I2C_I2CVAR_H_
#define _DEV_I2C_I2CVAR_H_
#include <sys/device.h>
#include <sys/mutex.h>
#include <dev/i2c/i2c_io.h>
#include <prop/proplib.h>
/* Flags passed to i2c routines. */
#define I2C_F_WRITE 0 /* new transfer is a write */
#define I2C_F_READ __BIT(0) /* new transfer is a read */
#define I2C_F_LAST __BIT(1) /* last byte of read */
#define I2C_F_STOP __BIT(2) /* send stop after byte */
#define I2C_F_POLL __BIT(3) /* poll, don't sleep */
#define I2C_F_PEC __BIT(4) /* smbus packet error checking */
#define I2C_F_SPEED __BITS(28,31) /* I2C transfer speed selector */
#define I2C_SPEED_SM 0 /* standard mode (100Kb/s) */
#define I2C_SPEED_FM 1 /* fast mode (400Kb/s) */
#define I2C_SPEED_FMPLUS 2 /* fast mode+ (1Mb/s) */
#define I2C_SPEED_HS 3 /* high speed (3.4Mb/s) */
/* i2c bus instance properties */
#define I2C_PROP_INDIRECT_PROBE_STRATEGY \
"i2c-indirect-probe-strategy"
#define I2C_PROBE_STRATEGY_QUICK_WRITE \
"smbus-quick-write"
#define I2C_PROBE_STRATEGY_RECEIVE_BYTE \
"smbus-receive-byte"
#define I2C_PROBE_STRATEGY_NONE \
"none"
#define I2C_PROP_INDIRECT_DEVICE_PERMITLIST \
"i2c-indirect-device-permitlist"
/* value is a prop_array of prop_strings */
struct ic_intr_list {
LIST_ENTRY(ic_intr_list) il_next;
int (*il_intr)(void *);
void *il_intrarg;
};
/*
* This structure provides the interface between the i2c framework
* and the underlying i2c controller.
*
* Note that this structure is designed specifically to allow us
* to either use the autoconfiguration framework or not. This
* allows a driver for a board with a private i2c bus use generic
* i2c client drivers for chips that might be on that board.
*/
typedef struct i2c_controller {
void *ic_cookie; /* controller private */
/*
* These provide synchronization in the presence of
* multiple users of the i2c bus. When a device
* driver wishes to perform transfers on the i2c
* bus, the driver should acquire the bus. When
* the driver is finished, it should release the
* bus.
*
* The main synchronization logic is handled by the
* generic i2c layer, but optional hooks to back-end
* drivers are provided in case additional processing
* is needed (e.g. enabling the i2c controller).
*/
kmutex_t ic_bus_lock;
int (*ic_acquire_bus)(void *, int);
void (*ic_release_bus)(void *, int);
/*
* The preferred API for clients of the i2c interface
* is the scripted API. This handles i2c controllers
* that do not provide raw access to the i2c signals.
*/
int (*ic_exec)(void *, i2c_op_t, i2c_addr_t, const void *, size_t,
void *, size_t, int);
int (*ic_send_start)(void *, int);
int (*ic_send_stop)(void *, int);
int (*ic_initiate_xfer)(void *, i2c_addr_t, int);
int (*ic_read_byte)(void *, uint8_t *, int);
int (*ic_write_byte)(void *, uint8_t, int);
struct i2c_tag_private *ic_tag_private;
} *i2c_tag_t;
/* Used to attach the i2c framework to the controller. */
struct i2cbus_attach_args {
i2c_tag_t iba_tag; /* the controller */
prop_array_t iba_child_devices; /* child devices (direct config) */
};
/* Type of value stored in "ia_cookie" */
enum i2c_cookie_type {
I2C_COOKIE_NONE, /* Cookie is not valid */
I2C_COOKIE_OF, /* Cookie is an OF node phandle */
I2C_COOKIE_ACPI, /* Cookie is an ACPI handle */
};
/* Used to attach devices on the i2c bus. */
struct i2c_attach_args {
i2c_tag_t ia_tag; /* our controller */
i2c_addr_t ia_addr; /* address of device */
int ia_type; /* bus type */
/* only set if using direct config */
const char * ia_name; /* name of the device */
int ia_ncompat; /* number of pointers in the
ia_compat array */
const char ** ia_compat; /* chip names */
prop_dictionary_t ia_prop; /* dictionary for this device */
/*
* The following is of limited usefulness and should only be used
* in rare cases where we really know what we are doing. Example:
* a machine dependent i2c driver (located in sys/arch/$arch/dev)
* needing to access some firmware properties.
* Depending on the firmware in use, an identifier for the device
* may be present. Example: on OpenFirmware machines the device
* tree OF node - if available. This info is hard to transport
* down to MD drivers through the MI i2c bus otherwise.
*
* On ACPI platforms this is the ACPI_HANDLE of the device.
*/
uintptr_t ia_cookie; /* OF node in openfirmware machines */
enum i2c_cookie_type ia_cookietype; /* Value type of cookie */
};
/*
* API presented to i2c controllers.
*/
int iicbus_print(void *, const char *);
void iic_tag_init(i2c_tag_t);
void iic_tag_fini(i2c_tag_t);
/*
* API presented to i2c devices.
*/
int iic_compatible_match(const struct i2c_attach_args *,
const struct device_compatible_entry *);
bool iic_use_direct_match(const struct i2c_attach_args *, const cfdata_t,
const struct device_compatible_entry *, int *);
const struct device_compatible_entry *
iic_compatible_lookup(const struct i2c_attach_args *,
const struct device_compatible_entry *);
/*
* Constants to indicate the quality of a match made by a driver's
* match routine, from lowest to highest:
*
* -- Address only; no other checks were made.
*
* -- Address + device probed and recognized.
*
* -- Direct-config match by "compatible" string.
*
* -- Direct-config match by specific driver name.
*/
#define I2C_MATCH_ADDRESS_ONLY 1
#define I2C_MATCH_ADDRESS_AND_PROBE 2
#define I2C_MATCH_DIRECT_COMPATIBLE 10
#define I2C_MATCH_DIRECT_COMPATIBLE_MAX 99
#define I2C_MATCH_DIRECT_SPECIFIC 100
#ifdef _I2C_PRIVATE
/*
* Macros used internally by the i2c framework.
*/
#define iic_send_start(ic, flags) \
(*(ic)->ic_send_start)((ic)->ic_cookie, (flags))
#define iic_send_stop(ic, flags) \
(*(ic)->ic_send_stop)((ic)->ic_cookie, (flags))
#define iic_initiate_xfer(ic, addr, flags) \
(*(ic)->ic_initiate_xfer)((ic)->ic_cookie, (addr), (flags))
#define iic_read_byte(ic, bytep, flags) \
(*(ic)->ic_read_byte)((ic)->ic_cookie, (bytep), (flags))
#define iic_write_byte(ic, byte, flags) \
(*(ic)->ic_write_byte)((ic)->ic_cookie, (byte), (flags))
#endif /* _I2C_PRIVATE */
/*
* Simplified API for clients of the i2c framework. Definitions
* in <dev/i2c/i2c_io.h>.
*/
int iic_acquire_bus(i2c_tag_t, int);
void iic_release_bus(i2c_tag_t, int);
int iic_exec(i2c_tag_t, i2c_op_t, i2c_addr_t, const void *,
size_t, void *, size_t, int);
int iic_smbus_write_byte(i2c_tag_t, i2c_addr_t, uint8_t, uint8_t, int);
int iic_smbus_write_word(i2c_tag_t, i2c_addr_t, uint8_t, uint16_t, int);
int iic_smbus_read_byte(i2c_tag_t, i2c_addr_t, uint8_t, uint8_t *, int);
int iic_smbus_read_word(i2c_tag_t, i2c_addr_t, uint8_t, uint16_t *, int);
int iic_smbus_receive_byte(i2c_tag_t, i2c_addr_t, uint8_t *, int);
int iic_smbus_send_byte(i2c_tag_t, i2c_addr_t, uint8_t, int);
int iic_smbus_quick_read(i2c_tag_t, i2c_addr_t, int);
int iic_smbus_quick_write(i2c_tag_t, i2c_addr_t, int);
int iic_smbus_block_read(i2c_tag_t, i2c_addr_t, uint8_t, uint8_t *,
size_t, int);
int iic_smbus_block_write(i2c_tag_t, i2c_addr_t, uint8_t, uint8_t *,
size_t, int);
#endif /* _DEV_I2C_I2CVAR_H_ */
|