89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
|
/* 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 */
|