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