105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
#ifndef __SOUND_I2C_H
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#define __SOUND_I2C_H
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/*
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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 semaphore 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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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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down(&bus->master->lock_mutex);
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else
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down(&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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up(&bus->master->lock_mutex);
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else
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up(&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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