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
26 struct 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
39 struct 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
48 struct 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
54 struct 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 const 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
78 int snd_i2c_bus_create(struct snd_card *card, const char *name,
79 struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
80 int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
81 unsigned char addr, struct snd_i2c_device **rdevice);
82 int snd_i2c_device_free(struct snd_i2c_device *device);
83
snd_i2c_lock(struct snd_i2c_bus * bus)84 static 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
snd_i2c_unlock(struct snd_i2c_bus * bus)92 static 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
100 int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
101 int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
102 int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
103
104 #endif /* __SOUND_I2C_H */
105