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| 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 | |
| 10 | struct 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 | |
| 23 | struct 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 | |
| 32 | struct 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 | |
| 38 | struct 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 | |
| 62 | int snd_i2c_bus_create(struct snd_card *card, const char *name, |
| 63 | struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c); |
| 64 | int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name, |
| 65 | unsigned char addr, struct snd_i2c_device **rdevice); |
| 66 | int snd_i2c_device_free(struct snd_i2c_device *device); |
| 67 | |
| 68 | static 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 | |
| 76 | static 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 | |
| 84 | int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count); |
| 85 | int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count); |
| 86 | int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr); |
| 87 | |
| 88 | #endif /* __SOUND_I2C_H */ |
| 89 |
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