| 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 |
|
|---|
| 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 |
|
|---|
| 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 */
|
|---|
