/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_I2C_H
#define __SOUND_I2C_H
/*
*/
#define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
struct snd_i2c_device {
struct list_head list;
struct snd_i2c_bus *bus; /* I2C bus */
char name[32]; /* some useful device name */
unsigned short flags; /* device flags */
unsigned short addr; /* device address (might be 10-bit) */
unsigned long private_value;
void *private_data;
void (*private_free)(struct snd_i2c_device *device);
};
#define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
struct snd_i2c_bit_ops {
void (*start)(struct snd_i2c_bus *bus); /* transfer start */
void (*stop)(struct snd_i2c_bus *bus); /* transfer stop */
void (*direction)(struct snd_i2c_bus *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
void (*setlines)(struct snd_i2c_bus *bus, int clock, int data);
int (*getclock)(struct snd_i2c_bus *bus);
int (*getdata)(struct snd_i2c_bus *bus, int ack);
};
struct snd_i2c_ops {
int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);
};
struct snd_i2c_bus {
struct snd_card *card; /* card which I2C belongs to */
char name[32]; /* some useful label */
struct mutex lock_mutex;
struct snd_i2c_bus *master; /* master bus when SCK/SCL is shared */
struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
struct list_head devices; /* attached devices to this bus */
union {
struct snd_i2c_bit_ops *bit;
void *ops;
} hw_ops; /* lowlevel operations */
const struct snd_i2c_ops *ops; /* midlevel operations */
unsigned long private_value;
void *private_data;
void (*private_free)(struct snd_i2c_bus *bus);
};
#define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
int snd_i2c_bus_create(struct snd_card *card, const char *name,
struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
unsigned char addr, struct snd_i2c_device **rdevice);
int snd_i2c_device_free(struct snd_i2c_device *device);
static inline void snd_i2c_lock(struct snd_i2c_bus *bus)
{
if (bus->master)
mutex_lock(&bus->master->lock_mutex);
else
mutex_lock(&bus->lock_mutex);
}
static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)
{
if (bus->master)
mutex_unlock(&bus->master->lock_mutex);
else
mutex_unlock(&bus->lock_mutex);
}
int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
#endif /* __SOUND_I2C_H */
