Commit | Line | Data |
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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | tea6420 - i2c-driver for the tea6420 by SGS Thomson | |
4 | ||
5 | Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> | |
a832781c | 6 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
1da177e4 LT |
7 | |
8 | The tea6420 is a bus controlled audio-matrix with 5 stereo inputs, | |
9 | 4 stereo outputs and gain control for each output. | |
3ad2f3fb | 10 | It is cascadable, i.e. it can be found at the addresses 0x98 |
1da177e4 LT |
11 | and 0x9a on the i2c-bus. |
12 | ||
f8a7647d | 13 | For detailed information download the specifications directly |
1da177e4 LT |
14 | from SGS Thomson at http://www.st.com |
15 | ||
1da177e4 LT |
16 | */ |
17 | ||
a8733ca5 | 18 | |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/ioctl.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 | 22 | #include <linux/i2c.h> |
2a5b828d | 23 | #include <media/v4l2-device.h> |
1da177e4 LT |
24 | #include "tea6420.h" |
25 | ||
a832781c HV |
26 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
27 | MODULE_DESCRIPTION("tea6420 driver"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
30 | static int debug; | |
1da177e4 | 31 | module_param(debug, int, 0644); |
f87086e3 | 32 | |
a832781c | 33 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
1da177e4 | 34 | |
1da177e4 | 35 | |
1da177e4 | 36 | /* make a connection between the input 'i' and the output 'o' |
1b8dac15 | 37 | with gain 'g' (note: i = 6 means 'mute') */ |
5325b427 HV |
38 | static int tea6420_s_routing(struct v4l2_subdev *sd, |
39 | u32 i, u32 o, u32 config) | |
1da177e4 | 40 | { |
1b8dac15 | 41 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
5325b427 | 42 | int g = (o >> 4) & 0xf; |
a832781c | 43 | u8 byte; |
1da177e4 LT |
44 | int ret; |
45 | ||
5325b427 | 46 | o &= 0xf; |
1b8dac15 | 47 | v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g); |
1da177e4 | 48 | |
c84e6036 | 49 | /* check if the parameters are valid */ |
1da177e4 | 50 | if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0) |
1b8dac15 | 51 | return -EINVAL; |
1da177e4 | 52 | |
a832781c | 53 | byte = ((o - 1) << 5); |
1da177e4 LT |
54 | byte |= (i - 1); |
55 | ||
56 | /* to understand this, have a look at the tea6420-specs (p.5) */ | |
57 | switch (g) { | |
58 | case 0: | |
59 | byte |= (3 << 3); | |
60 | break; | |
61 | case 2: | |
62 | byte |= (2 << 3); | |
63 | break; | |
64 | case 4: | |
65 | byte |= (1 << 3); | |
66 | break; | |
67 | case 6: | |
68 | break; | |
69 | } | |
70 | ||
71 | ret = i2c_smbus_write_byte(client, byte); | |
72 | if (ret) { | |
1b8dac15 | 73 | v4l2_dbg(1, debug, sd, |
a832781c | 74 | "i2c_smbus_write_byte() failed, ret:%d\n", ret); |
1da177e4 LT |
75 | return -EIO; |
76 | } | |
1da177e4 LT |
77 | return 0; |
78 | } | |
79 | ||
2a5b828d HV |
80 | /* ----------------------------------------------------------------------- */ |
81 | ||
1b8dac15 HV |
82 | static const struct v4l2_subdev_audio_ops tea6420_audio_ops = { |
83 | .s_routing = tea6420_s_routing, | |
2a5b828d HV |
84 | }; |
85 | ||
86 | static const struct v4l2_subdev_ops tea6420_ops = { | |
1b8dac15 | 87 | .audio = &tea6420_audio_ops, |
2a5b828d HV |
88 | }; |
89 | ||
8569336f | 90 | static int tea6420_probe(struct i2c_client *client) |
a832781c | 91 | { |
2a5b828d | 92 | struct v4l2_subdev *sd; |
a832781c | 93 | int err, i; |
1da177e4 | 94 | |
a832781c HV |
95 | /* let's see whether this adapter can support what we need */ |
96 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) | |
97 | return -EIO; | |
98 | ||
99 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
100 | client->addr << 1, client->adapter->name); | |
1da177e4 | 101 | |
c02b211d | 102 | sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); |
1b8dac15 HV |
103 | if (sd == NULL) |
104 | return -ENOMEM; | |
105 | v4l2_i2c_subdev_init(sd, client, &tea6420_ops); | |
106 | ||
1da177e4 LT |
107 | /* set initial values: set "mute"-input to all outputs at gain 0 */ |
108 | err = 0; | |
5325b427 HV |
109 | for (i = 1; i < 5; i++) |
110 | err += tea6420_s_routing(sd, 6, i, 0); | |
1da177e4 | 111 | if (err) { |
a832781c | 112 | v4l_dbg(1, debug, client, "could not initialize tea6420\n"); |
1da177e4 LT |
113 | return -ENODEV; |
114 | } | |
2a5b828d HV |
115 | return 0; |
116 | } | |
117 | ||
ed5c2f5f | 118 | static void tea6420_remove(struct i2c_client *client) |
2a5b828d HV |
119 | { |
120 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
121 | ||
122 | v4l2_device_unregister_subdev(sd); | |
1da177e4 LT |
123 | } |
124 | ||
a832781c | 125 | static const struct i2c_device_id tea6420_id[] = { |
cc4cbd4b | 126 | { "tea6420" }, |
a832781c | 127 | { } |
1da177e4 | 128 | }; |
a832781c | 129 | MODULE_DEVICE_TABLE(i2c, tea6420_id); |
1da177e4 | 130 | |
e2c52ba6 HV |
131 | static struct i2c_driver tea6420_driver = { |
132 | .driver = { | |
e2c52ba6 HV |
133 | .name = "tea6420", |
134 | }, | |
aaeb31c0 | 135 | .probe = tea6420_probe, |
e2c52ba6 HV |
136 | .remove = tea6420_remove, |
137 | .id_table = tea6420_id, | |
1da177e4 | 138 | }; |
e2c52ba6 | 139 | |
c6e8d86f | 140 | module_i2c_driver(tea6420_driver); |