include/sound/i2c.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
8 #define SND_I2C_DEVICE_ADDRTEN	(1<<0)	/* 10-bit I2C address */
12 	struct snd_i2c_bus *bus;	/* I2C bus */  member
13 	char name[32];		/* some useful device name */  member
15 	unsigned short addr;	/* device address (might be 10-bit) */
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…
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);
35 	int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);
39 	struct snd_card *card;	/* card which I2C belongs to */
40 	char name[32];		/* some useful label */  member
44 	struct snd_i2c_bus *master;	/* master bus when SCK/SCL is shared */
47 	struct list_head devices; /* attached devices to this bus */
57 	void (*private_free)(struct snd_i2c_bus *bus);
62 int snd_i2c_bus_create(struct snd_card *card, const char *name,
64 int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
68 static inline void snd_i2c_lock(struct snd_i2c_bus *bus)  in snd_i2c_lock()  argument
70 	if (bus->master)  in snd_i2c_lock()
71 		mutex_lock(&bus->master->lock_mutex);  in snd_i2c_lock()
73 		mutex_lock(&bus->lock_mutex);  in snd_i2c_lock()
76 static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)  in snd_i2c_unlock()  argument
78 	if (bus->master)  in snd_i2c_unlock()
79 		mutex_unlock(&bus->master->lock_mutex);  in snd_i2c_unlock()
81 		mutex_unlock(&bus->lock_mutex);  in snd_i2c_unlock()
86 int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);