Commit | Line | Data |
---|---|---|
fc279cc2 HV |
1 | /* |
2 | * Cirrus Logic cs3308 8-Channel Analog Volume Control | |
3 | * | |
4 | * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com> | |
5 | * Copyright (C) 2012 Steven Toth <stoth@kernellabs.com> | |
6 | * | |
7 | * Derived from cs5345.c Copyright (C) 2007 Hans Verkuil | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/i2c.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/videodev2.h> | |
26 | #include <media/v4l2-device.h> | |
27 | ||
28 | MODULE_DESCRIPTION("i2c device driver for cs3308 8-channel volume control"); | |
29 | MODULE_AUTHOR("Devin Heitmueller"); | |
30 | MODULE_LICENSE("GPL"); | |
31 | ||
32 | static inline int cs3308_write(struct v4l2_subdev *sd, u8 reg, u8 value) | |
33 | { | |
34 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
35 | ||
36 | return i2c_smbus_write_byte_data(client, reg, value); | |
37 | } | |
38 | ||
39 | static inline int cs3308_read(struct v4l2_subdev *sd, u8 reg) | |
40 | { | |
41 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
42 | ||
43 | return i2c_smbus_read_byte_data(client, reg); | |
44 | } | |
45 | ||
46 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
47 | static int cs3308_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) | |
48 | { | |
49 | reg->val = cs3308_read(sd, reg->reg & 0xffff); | |
50 | reg->size = 1; | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static int cs3308_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg) | |
55 | { | |
56 | cs3308_write(sd, reg->reg & 0xffff, reg->val & 0xff); | |
57 | return 0; | |
58 | } | |
59 | #endif | |
60 | ||
61 | /* ----------------------------------------------------------------------- */ | |
62 | ||
63 | static const struct v4l2_subdev_core_ops cs3308_core_ops = { | |
64 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
65 | .g_register = cs3308_g_register, | |
66 | .s_register = cs3308_s_register, | |
67 | #endif | |
68 | }; | |
69 | ||
70 | static const struct v4l2_subdev_ops cs3308_ops = { | |
71 | .core = &cs3308_core_ops, | |
72 | }; | |
73 | ||
74 | /* ----------------------------------------------------------------------- */ | |
75 | ||
76 | static int cs3308_probe(struct i2c_client *client, | |
77 | const struct i2c_device_id *id) | |
78 | { | |
79 | struct v4l2_subdev *sd; | |
80 | unsigned i; | |
81 | ||
82 | /* Check if the adapter supports the needed features */ | |
83 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
84 | return -EIO; | |
85 | ||
86 | if ((i2c_smbus_read_byte_data(client, 0x1c) & 0xf0) != 0xe0) | |
87 | return -ENODEV; | |
88 | ||
89 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
90 | client->addr << 1, client->adapter->name); | |
91 | ||
92 | sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); | |
93 | if (sd == NULL) | |
94 | return -ENOMEM; | |
95 | ||
96 | v4l2_i2c_subdev_init(sd, client, &cs3308_ops); | |
97 | ||
98 | /* Set some reasonable defaults */ | |
99 | cs3308_write(sd, 0x0d, 0x00); /* Power up all channels */ | |
100 | cs3308_write(sd, 0x0e, 0x00); /* Master Power */ | |
101 | cs3308_write(sd, 0x0b, 0x00); /* Device Configuration */ | |
102 | /* Set volume for each channel */ | |
103 | for (i = 1; i <= 8; i++) | |
104 | cs3308_write(sd, i, 0xd2); | |
105 | cs3308_write(sd, 0x0a, 0x00); /* Unmute all channels */ | |
106 | return 0; | |
107 | } | |
108 | ||
109 | /* ----------------------------------------------------------------------- */ | |
110 | ||
111 | static int cs3308_remove(struct i2c_client *client) | |
112 | { | |
113 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
114 | ||
115 | v4l2_device_unregister_subdev(sd); | |
116 | kfree(sd); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | /* ----------------------------------------------------------------------- */ | |
121 | ||
122 | static const struct i2c_device_id cs3308_id[] = { | |
123 | { "cs3308", 0 }, | |
124 | { } | |
125 | }; | |
126 | MODULE_DEVICE_TABLE(i2c, cs3308_id); | |
127 | ||
128 | static struct i2c_driver cs3308_driver = { | |
129 | .driver = { | |
130 | .owner = THIS_MODULE, | |
131 | .name = "cs3308", | |
132 | }, | |
133 | .probe = cs3308_probe, | |
134 | .remove = cs3308_remove, | |
135 | .id_table = cs3308_id, | |
136 | }; | |
137 | ||
138 | module_i2c_driver(cs3308_driver); |