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1/* SPDX-License-Identifier: GPL-2.0-or-later */2#ifndef __SOUND_I2C_H3#define __SOUND_I2C_H4 5/*6 */7 8#define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */9 10struct 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 23struct 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 32struct 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 38struct 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 62int snd_i2c_bus_create(struct snd_card *card, const char *name,63 struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);64int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,65 unsigned char addr, struct snd_i2c_device **rdevice);66int snd_i2c_device_free(struct snd_i2c_device *device);67 68static inline void snd_i2c_lock(struct snd_i2c_bus *bus)69{70 if (bus->master)71 mutex_lock(&bus->master->lock_mutex);72 else73 mutex_lock(&bus->lock_mutex);74}75 76static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)77{78 if (bus->master)79 mutex_unlock(&bus->master->lock_mutex);80 else81 mutex_unlock(&bus->lock_mutex);82}83 84int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);85int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);86int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);87 88#endif /* __SOUND_I2C_H */89