103 lines
3.4 KiB
C
103 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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typedef struct _snd_i2c_device snd_i2c_device_t;
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typedef struct _snd_i2c_bus snd_i2c_bus_t;
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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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snd_i2c_bus_t *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)(snd_i2c_device_t *device);
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};
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#define snd_i2c_device(n) list_entry(n, snd_i2c_device_t, list)
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typedef struct _snd_i2c_bit_ops {
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void (*start)(snd_i2c_bus_t *bus); /* transfer start */
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void (*stop)(snd_i2c_bus_t *bus); /* transfer stop */
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void (*direction)(snd_i2c_bus_t *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
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void (*setlines)(snd_i2c_bus_t *bus, int clock, int data);
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int (*getclock)(snd_i2c_bus_t *bus);
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int (*getdata)(snd_i2c_bus_t *bus, int ack);
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} snd_i2c_bit_ops_t;
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typedef struct _snd_i2c_ops {
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int (*sendbytes)(snd_i2c_device_t *device, unsigned char *bytes, int count);
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int (*readbytes)(snd_i2c_device_t *device, unsigned char *bytes, int count);
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int (*probeaddr)(snd_i2c_bus_t *bus, unsigned short addr);
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} snd_i2c_ops_t;
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struct _snd_i2c_bus {
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snd_card_t *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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snd_i2c_bus_t *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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snd_i2c_bit_ops_t *bit;
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void *ops;
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} hw_ops; /* lowlevel operations */
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snd_i2c_ops_t *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)(snd_i2c_bus_t *bus);
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};
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#define snd_i2c_slave_bus(n) list_entry(n, snd_i2c_bus_t, buses)
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int snd_i2c_bus_create(snd_card_t *card, const char *name, snd_i2c_bus_t *master, snd_i2c_bus_t **ri2c);
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int snd_i2c_device_create(snd_i2c_bus_t *bus, const char *name, unsigned char addr, snd_i2c_device_t **rdevice);
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int snd_i2c_device_free(snd_i2c_device_t *device);
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static inline void snd_i2c_lock(snd_i2c_bus_t *bus) {
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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(snd_i2c_bus_t *bus) {
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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(snd_i2c_device_t *device, unsigned char *bytes, int count);
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int snd_i2c_readbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
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int snd_i2c_probeaddr(snd_i2c_bus_t *bus, unsigned short addr);
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#endif /* __SOUND_I2C_H */
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