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#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

 *

 *

 */

#define SND_I2C_DEVICE_ADDRTEN  (1<<0)  /* 10-bit I2C address */

struct snd_i2c_device {

        struct list_head list;

        struct snd_i2c_bus *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)(struct snd_i2c_device *device);

};

#define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)

struct snd_i2c_bit_ops {

        void (*start)(struct snd_i2c_bus *bus); /* transfer start */

        void (*stop)(struct snd_i2c_bus *bus);  /* transfer stop */

        void (*direction)(struct snd_i2c_bus *bus, int clock, int data);  /* set line direction (0 = write, 1 = read) */

        void (*setlines)(struct snd_i2c_bus *bus, int clock, int data);

        int (*getclock)(struct snd_i2c_bus *bus);

        int (*getdata)(struct snd_i2c_bus *bus, int ack);

};

struct snd_i2c_ops {

        int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);

        int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);

        int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);

};

struct snd_i2c_bus {

        struct snd_card *card;  /* card which I2C belongs to */

        char name[32];          /* some useful label */

        struct mutex lock_mutex;

        struct snd_i2c_bus *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 {

                struct snd_i2c_bit_ops *bit;

                void *ops;

        } hw_ops;               /* lowlevel operations */

        struct snd_i2c_ops *ops;        /* midlevel operations */

        unsigned long private_value;

        void *private_data;

        void (*private_free)(struct snd_i2c_bus *bus);

};

#define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)

int snd_i2c_bus_create(struct snd_card *card, const char *name,

                       struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);

int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,

                          unsigned char addr, struct snd_i2c_device **rdevice);

int snd_i2c_device_free(struct snd_i2c_device *device);

static inline void snd_i2c_lock(struct snd_i2c_bus *bus)

{

        if (bus->master)

                mutex_lock(&bus->master->lock_mutex);

        else

                mutex_lock(&bus->lock_mutex);

}

static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)

{

        if (bus->master)

                mutex_unlock(&bus->master->lock_mutex);

        else

                mutex_unlock(&bus->lock_mutex);

}

int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);

int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);

int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);

#endif /* __SOUND_I2C_H */