1#ifndef __SOUND_I2C_H
2#define __SOUND_I2C_H
3
4/*
5 *
6 *
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.
11 *
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.
16 *
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
20 *
21 *
22 */
23
24#define SND_I2C_DEVICE_ADDRTEN	(1<<0)	/* 10-bit I2C address */
25
26struct 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;
33	void *private_data;
34	void (*private_free)(struct snd_i2c_device *device);
35};
36
37#define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
38
39struct 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);
46};
47
48struct snd_i2c_ops {
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);
52};
53
54struct snd_i2c_bus {
55	struct snd_card *card;	/* card which I2C belongs to */
56	char name[32];		/* some useful label */
57
58	struct mutex lock_mutex;
59
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 */
62
63	struct list_head devices; /* attached devices to this bus */
64
65	union {
66		struct snd_i2c_bit_ops *bit;
67		void *ops;
68	} hw_ops;		/* lowlevel operations */
69	struct snd_i2c_ops *ops;	/* midlevel operations */
70
71	unsigned long private_value;
72	void *private_data;
73	void (*private_free)(struct snd_i2c_bus *bus);
74};
75
76#define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
77
78int snd_i2c_bus_create(struct snd_card *card, const char *name,
79		       struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
80int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
81			  unsigned char addr, struct snd_i2c_device **rdevice);
82int snd_i2c_device_free(struct snd_i2c_device *device);
83
84static inline void snd_i2c_lock(struct snd_i2c_bus *bus)
85{
86	if (bus->master)
87		mutex_lock(&bus->master->lock_mutex);
88	else
89		mutex_lock(&bus->lock_mutex);
90}
91
92static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)
93{
94	if (bus->master)
95		mutex_unlock(&bus->master->lock_mutex);
96	else
97		mutex_unlock(&bus->lock_mutex);
98}
99
100int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
101int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
102int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
103
104#endif /* __SOUND_I2C_H */
105