7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
26 struct snd_i2c_device
{
27 struct list_head list
;
28 struct snd_i2c_bus
*bus
; /* I2C bus */
29 char name
[32]; /* some useful device name */
30 unsigned short flags
; /* device flags */
31 unsigned short addr
; /* device address (might be 10-bit) */
32 unsigned long private_value
;
34 void (*private_free
)(struct snd_i2c_device
*device
);
37 #define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
39 struct snd_i2c_bit_ops
{
40 void (*start
)(struct snd_i2c_bus
*bus
); /* transfer start */
41 void (*stop
)(struct snd_i2c_bus
*bus
); /* transfer stop */
42 void (*direction
)(struct snd_i2c_bus
*bus
, int clock
, int data
); /* set line direction (0 = write, 1 = read) */
43 void (*setlines
)(struct snd_i2c_bus
*bus
, int clock
, int data
);
44 int (*getclock
)(struct snd_i2c_bus
*bus
);
45 int (*getdata
)(struct snd_i2c_bus
*bus
, int ack
);
49 int (*sendbytes
)(struct snd_i2c_device
*device
, unsigned char *bytes
, int count
);
50 int (*readbytes
)(struct snd_i2c_device
*device
, unsigned char *bytes
, int count
);
51 int (*probeaddr
)(struct snd_i2c_bus
*bus
, unsigned short addr
);
55 struct snd_card
*card
; /* card which I2C belongs to */
56 char name
[32]; /* some useful label */
58 struct mutex lock_mutex
;
60 struct snd_i2c_bus
*master
; /* master bus when SCK/SCL is shared */
61 struct list_head buses
; /* master: slave buses sharing SCK/SCL, slave: link list */
63 struct list_head devices
; /* attached devices to this bus */
66 struct snd_i2c_bit_ops
*bit
;
68 } hw_ops
; /* lowlevel operations */
69 struct snd_i2c_ops
*ops
; /* midlevel operations */
71 unsigned long private_value
;
73 void (*private_free
)(struct snd_i2c_bus
*bus
);
76 #define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
78 int snd_i2c_bus_create(struct snd_card
*card
, const char *name
,
79 struct snd_i2c_bus
*master
, struct snd_i2c_bus
**ri2c
);
80 int snd_i2c_device_create(struct snd_i2c_bus
*bus
, const char *name
,
81 unsigned char addr
, struct snd_i2c_device
**rdevice
);
82 int snd_i2c_device_free(struct snd_i2c_device
*device
);
84 static inline void snd_i2c_lock(struct snd_i2c_bus
*bus
)
87 mutex_lock(&bus
->master
->lock_mutex
);
89 mutex_lock(&bus
->lock_mutex
);
92 static inline void snd_i2c_unlock(struct snd_i2c_bus
*bus
)
95 mutex_unlock(&bus
->master
->lock_mutex
);
97 mutex_unlock(&bus
->lock_mutex
);
100 int snd_i2c_sendbytes(struct snd_i2c_device
*device
, unsigned char *bytes
, int count
);
101 int snd_i2c_readbytes(struct snd_i2c_device
*device
, unsigned char *bytes
, int count
);
102 int snd_i2c_probeaddr(struct snd_i2c_bus
*bus
, unsigned short addr
);
104 #endif /* __SOUND_I2C_H */