103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
|
#ifndef __SOUND_I2C_H
|
||
|
|
#define __SOUND_I2C_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
*
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
typedef struct _snd_i2c_device snd_i2c_device_t;
|
||
|
|
typedef struct _snd_i2c_bus snd_i2c_bus_t;
|
||
|
|
|
||
|
|
#define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
|
||
|
|
|
||
|
|
struct _snd_i2c_device {
|
||
|
|
struct list_head list;
|
||
|
|
snd_i2c_bus_t *bus; /* I2C bus */
|
||
|
|
char name[32]; /* some useful device name */
|
||
|
|
unsigned short flags; /* device flags */
|
||
|
|
unsigned short addr; /* device address (might be 10-bit) */
|
||
|
|
unsigned long private_value;
|
||
|
|
void *private_data;
|
||
|
|
void (*private_free)(snd_i2c_device_t *device);
|
||
|
|
};
|
||
|
|
|
||
|
|
#define snd_i2c_device(n) list_entry(n, snd_i2c_device_t, list)
|
||
|
|
|
||
|
|
typedef struct _snd_i2c_bit_ops {
|
||
|
|
void (*start)(snd_i2c_bus_t *bus); /* transfer start */
|
||
|
|
void (*stop)(snd_i2c_bus_t *bus); /* transfer stop */
|
||
|
|
void (*direction)(snd_i2c_bus_t *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
|
||
|
|
void (*setlines)(snd_i2c_bus_t *bus, int clock, int data);
|
||
|
|
int (*getclock)(snd_i2c_bus_t *bus);
|
||
|
|
int (*getdata)(snd_i2c_bus_t *bus, int ack);
|
||
|
|
} snd_i2c_bit_ops_t;
|
||
|
|
|
||
|
|
typedef struct _snd_i2c_ops {
|
||
|
|
int (*sendbytes)(snd_i2c_device_t *device, unsigned char *bytes, int count);
|
||
|
|
int (*readbytes)(snd_i2c_device_t *device, unsigned char *bytes, int count);
|
||
|
|
int (*probeaddr)(snd_i2c_bus_t *bus, unsigned short addr);
|
||
|
|
} snd_i2c_ops_t;
|
||
|
|
|
||
|
|
struct _snd_i2c_bus {
|
||
|
|
snd_card_t *card; /* card which I2C belongs to */
|
||
|
|
char name[32]; /* some useful label */
|
||
|
|
|
||
|
|
struct semaphore lock_mutex;
|
||
|
|
|
||
|
|
snd_i2c_bus_t *master; /* master bus when SCK/SCL is shared */
|
||
|
|
struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
|
||
|
|
|
||
|
|
struct list_head devices; /* attached devices to this bus */
|
||
|
|
|
||
|
|
union {
|
||
|
|
snd_i2c_bit_ops_t *bit;
|
||
|
|
void *ops;
|
||
|
|
} hw_ops; /* lowlevel operations */
|
||
|
|
snd_i2c_ops_t *ops; /* midlevel operations */
|
||
|
|
|
||
|
|
unsigned long private_value;
|
||
|
|
void *private_data;
|
||
|
|
void (*private_free)(snd_i2c_bus_t *bus);
|
||
|
|
};
|
||
|
|
|
||
|
|
#define snd_i2c_slave_bus(n) list_entry(n, snd_i2c_bus_t, buses)
|
||
|
|
|
||
|
|
int snd_i2c_bus_create(snd_card_t *card, const char *name, snd_i2c_bus_t *master, snd_i2c_bus_t **ri2c);
|
||
|
|
int snd_i2c_device_create(snd_i2c_bus_t *bus, const char *name, unsigned char addr, snd_i2c_device_t **rdevice);
|
||
|
|
int snd_i2c_device_free(snd_i2c_device_t *device);
|
||
|
|
|
||
|
|
static inline void snd_i2c_lock(snd_i2c_bus_t *bus) {
|
||
|
|
if (bus->master)
|
||
|
|
down(&bus->master->lock_mutex);
|
||
|
|
else
|
||
|
|
down(&bus->lock_mutex);
|
||
|
|
}
|
||
|
|
static inline void snd_i2c_unlock(snd_i2c_bus_t *bus) {
|
||
|
|
if (bus->master)
|
||
|
|
up(&bus->master->lock_mutex);
|
||
|
|
else
|
||
|
|
up(&bus->lock_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
int snd_i2c_sendbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
|
||
|
|
int snd_i2c_readbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
|
||
|
|
int snd_i2c_probeaddr(snd_i2c_bus_t *bus, unsigned short addr);
|
||
|
|
|
||
|
|
#endif /* __SOUND_I2C_H */
|