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
|
#ifndef __SOUND_I2C_H
#define __SOUND_I2C_H
/*
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
*/
typedef struct _snd_i2c_device snd_i2c_device_t;
typedef struct _snd_i2c_bus snd_i2c_bus_t;
#define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
struct _snd_i2c_device {
struct list_head list;
snd_i2c_bus_t *bus; /* I2C bus */
char name[32]; /* some useful device name */
unsigned short flags; /* device flags */
unsigned short addr; /* device address (might be 10-bit) */
unsigned long private_value;
void *private_data;
void (*private_free)(snd_i2c_device_t *device);
};
#define snd_i2c_device(n) list_entry(n, snd_i2c_device_t, list)
typedef struct _snd_i2c_bit_ops {
void (*start)(snd_i2c_bus_t *bus); /* transfer start */
void (*stop)(snd_i2c_bus_t *bus); /* transfer stop */
void (*direction)(snd_i2c_bus_t *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
void (*setlines)(snd_i2c_bus_t *bus, int clock, int data);
int (*getclock)(snd_i2c_bus_t *bus);
int (*getdata)(snd_i2c_bus_t *bus, int ack);
} snd_i2c_bit_ops_t;
typedef struct _snd_i2c_ops {
int (*sendbytes)(snd_i2c_device_t *device, unsigned char *bytes, int count);
int (*readbytes)(snd_i2c_device_t *device, unsigned char *bytes, int count);
int (*probeaddr)(snd_i2c_bus_t *bus, unsigned short addr);
} snd_i2c_ops_t;
struct _snd_i2c_bus {
snd_card_t *card; /* card which I2C belongs to */
char name[32]; /* some useful label */
struct semaphore lock_mutex;
snd_i2c_bus_t *master; /* master bus when SCK/SCL is shared */
struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
struct list_head devices; /* attached devices to this bus */
union {
snd_i2c_bit_ops_t *bit;
void *ops;
} hw_ops; /* lowlevel operations */
snd_i2c_ops_t *ops; /* midlevel operations */
unsigned long private_value;
void *private_data;
void (*private_free)(snd_i2c_bus_t *bus);
};
#define snd_i2c_slave_bus(n) list_entry(n, snd_i2c_bus_t, buses)
int snd_i2c_bus_create(snd_card_t *card, const char *name, snd_i2c_bus_t *master, snd_i2c_bus_t **ri2c);
int snd_i2c_device_create(snd_i2c_bus_t *bus, const char *name, unsigned char addr, snd_i2c_device_t **rdevice);
int snd_i2c_device_free(snd_i2c_device_t *device);
static inline void snd_i2c_lock(snd_i2c_bus_t *bus) {
if (bus->master)
down(&bus->master->lock_mutex);
else
down(&bus->lock_mutex);
}
static inline void snd_i2c_unlock(snd_i2c_bus_t *bus) {
if (bus->master)
up(&bus->master->lock_mutex);
else
up(&bus->lock_mutex);
}
int snd_i2c_sendbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
int snd_i2c_readbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
int snd_i2c_probeaddr(snd_i2c_bus_t *bus, unsigned short addr);
#endif /* __SOUND_I2C_H */
|
