1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef __SOUND_I2C_H
3 #define __SOUND_I2C_H
4
5 /*
6 */
7
8 #define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
9
10 struct snd_i2c_device {
11 struct list_head list;
12 struct snd_i2c_bus *bus; /* I2C bus */
13 char name[32]; /* some useful device name */
14 unsigned short flags; /* device flags */
15 unsigned short addr; /* device address (might be 10-bit) */
16 unsigned long private_value;
17 void *private_data;
18 void (*private_free)(struct snd_i2c_device *device);
19 };
20
21 #define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
22
23 struct snd_i2c_bit_ops {
24 void (*start)(struct snd_i2c_bus *bus); /* transfer start */
25 void (*stop)(struct snd_i2c_bus *bus); /* transfer stop */
26 void (*direction)(struct snd_i2c_bus *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
27 void (*setlines)(struct snd_i2c_bus *bus, int clock, int data);
28 int (*getclock)(struct snd_i2c_bus *bus);
29 int (*getdata)(struct snd_i2c_bus *bus, int ack);
30 };
31
32 struct snd_i2c_ops {
33 int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
34 int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
35 int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);
36 };
37
38 struct snd_i2c_bus {
39 struct snd_card *card; /* card which I2C belongs to */
40 char name[32]; /* some useful label */
41
42 struct mutex lock_mutex;
43
44 struct snd_i2c_bus *master; /* master bus when SCK/SCL is shared */
45 struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
46
47 struct list_head devices; /* attached devices to this bus */
48
49 union {
50 struct snd_i2c_bit_ops *bit;
51 void *ops;
52 } hw_ops; /* lowlevel operations */
53 const struct snd_i2c_ops *ops; /* midlevel operations */
54
55 unsigned long private_value;
56 void *private_data;
57 void (*private_free)(struct snd_i2c_bus *bus);
58 };
59
60 #define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
61
62 int snd_i2c_bus_create(struct snd_card *card, const char *name,
63 struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
64 int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
65 unsigned char addr, struct snd_i2c_device **rdevice);
66 int snd_i2c_device_free(struct snd_i2c_device *device);
67
snd_i2c_lock(struct snd_i2c_bus * bus)68 static inline void snd_i2c_lock(struct snd_i2c_bus *bus)
69 {
70 if (bus->master)
71 mutex_lock(&bus->master->lock_mutex);
72 else
73 mutex_lock(&bus->lock_mutex);
74 }
75
snd_i2c_unlock(struct snd_i2c_bus * bus)76 static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)
77 {
78 if (bus->master)
79 mutex_unlock(&bus->master->lock_mutex);
80 else
81 mutex_unlock(&bus->lock_mutex);
82 }
83
84 int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
85 int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
86 int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
87
88 #endif /* __SOUND_I2C_H */
89