i2c.h (2857B)
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 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 else 73 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 else 81 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 */