Root/include/sound/i2c.h

1#ifndef __SOUND_I2C_H
2#define __SOUND_I2C_H
3
4/*
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 *
22 */
23
24#define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
25
26struct snd_i2c_device {
27    struct list_head list;
28    struct snd_i2c_bus *bus; /* I2C bus */
29    char name[32]; /* some useful device name */
30    unsigned short flags; /* device flags */
31    unsigned short addr; /* device address (might be 10-bit) */
32    unsigned long private_value;
33    void *private_data;
34    void (*private_free)(struct snd_i2c_device *device);
35};
36
37#define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
38
39struct snd_i2c_bit_ops {
40    void (*start)(struct snd_i2c_bus *bus); /* transfer start */
41    void (*stop)(struct snd_i2c_bus *bus); /* transfer stop */
42    void (*direction)(struct snd_i2c_bus *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
43    void (*setlines)(struct snd_i2c_bus *bus, int clock, int data);
44    int (*getclock)(struct snd_i2c_bus *bus);
45    int (*getdata)(struct snd_i2c_bus *bus, int ack);
46};
47
48struct snd_i2c_ops {
49    int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
50    int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
51    int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);
52};
53
54struct snd_i2c_bus {
55    struct snd_card *card; /* card which I2C belongs to */
56    char name[32]; /* some useful label */
57
58    struct mutex lock_mutex;
59
60    struct snd_i2c_bus *master; /* master bus when SCK/SCL is shared */
61    struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
62
63    struct list_head devices; /* attached devices to this bus */
64
65    union {
66        struct snd_i2c_bit_ops *bit;
67        void *ops;
68    } hw_ops; /* lowlevel operations */
69    struct snd_i2c_ops *ops; /* midlevel operations */
70
71    unsigned long private_value;
72    void *private_data;
73    void (*private_free)(struct snd_i2c_bus *bus);
74};
75
76#define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
77
78int snd_i2c_bus_create(struct snd_card *card, const char *name,
79               struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
80int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
81              unsigned char addr, struct snd_i2c_device **rdevice);
82int snd_i2c_device_free(struct snd_i2c_device *device);
83
84static inline void snd_i2c_lock(struct snd_i2c_bus *bus)
85{
86    if (bus->master)
87        mutex_lock(&bus->master->lock_mutex);
88    else
89        mutex_lock(&bus->lock_mutex);
90}
91
92static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)
93{
94    if (bus->master)
95        mutex_unlock(&bus->master->lock_mutex);
96    else
97        mutex_unlock(&bus->lock_mutex);
98}
99
100int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
101int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
102int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
103
104#endif /* __SOUND_I2C_H */
105

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