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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 | |
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; |
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 | |
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); |
46 | }; |
47 | |
48 | struct 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 | |
54 | struct 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 | |
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); |
83 | |
84 | static 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 | |
92 | static 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 | |
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); |
103 | |
104 | #endif /* __SOUND_I2C_H */ |
105 |
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Tags:
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