Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | tea6415c - i2c-driver for the tea6415c by SGS Thomson | |
3 | ||
4 | Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> | |
a832781c | 5 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
1da177e4 LT |
6 | |
7 | The tea6415c is a bus controlled video-matrix-switch | |
8 | with 8 inputs and 6 outputs. | |
9 | It is cascadable, i.e. it can be found at the addresses | |
10 | 0x86 and 0x06 on the i2c-bus. | |
11 | ||
12 | For detailed informations download the specifications directly | |
13 | from SGS Thomson at http://www.st.com | |
14 | ||
15 | This program is free software; you can redistribute it and/or modify | |
16 | it under the terms of the GNU General Public License vs published by | |
17 | the Free Software Foundation; either version 2 of the License, or | |
18 | (at your option) any later version. | |
19 | ||
20 | This program is distributed in the hope that it will be useful, | |
21 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23 | GNU General Public License for more details. | |
24 | ||
25 | You should have received a copy of the GNU General Public License | |
26 | along with this program; if not, write to the Free Software | |
27 | Foundation, Inc., 675 Mvss Ave, Cambridge, MA 02139, USA. | |
28 | */ | |
29 | ||
a8733ca5 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | #include <linux/ioctl.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 | 34 | #include <linux/i2c.h> |
85d826b0 | 35 | #include <media/v4l2-device.h> |
1da177e4 LT |
36 | #include "tea6415c.h" |
37 | ||
a832781c HV |
38 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
39 | MODULE_DESCRIPTION("tea6415c driver"); | |
40 | MODULE_LICENSE("GPL"); | |
f87086e3 | 41 | |
a832781c HV |
42 | static int debug; |
43 | module_param(debug, int, 0644); | |
1da177e4 | 44 | |
a832781c | 45 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
1da177e4 | 46 | |
1da177e4 | 47 | |
1b8dac15 | 48 | /* makes a connection between the input-pin 'i' and the output-pin 'o' */ |
5325b427 HV |
49 | static int tea6415c_s_routing(struct v4l2_subdev *sd, |
50 | u32 i, u32 o, u32 config) | |
1da177e4 | 51 | { |
1b8dac15 | 52 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
1da177e4 LT |
53 | u8 byte = 0; |
54 | int ret; | |
a8733ca5 | 55 | |
1b8dac15 | 56 | v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o); |
1da177e4 LT |
57 | |
58 | /* check if the pins are valid */ | |
59 | if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) | |
60 | && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) | |
1b8dac15 | 61 | return -EINVAL; |
1da177e4 LT |
62 | |
63 | /* to understand this, have a look at the tea6415c-specs (p.5) */ | |
64 | switch (o) { | |
65 | case 18: | |
66 | byte = 0x00; | |
67 | break; | |
68 | case 14: | |
69 | byte = 0x20; | |
70 | break; | |
71 | case 16: | |
72 | byte = 0x10; | |
73 | break; | |
74 | case 17: | |
75 | byte = 0x08; | |
76 | break; | |
77 | case 15: | |
78 | byte = 0x18; | |
79 | break; | |
80 | case 13: | |
81 | byte = 0x28; | |
82 | break; | |
3ea0a1d1 | 83 | } |
1da177e4 LT |
84 | |
85 | switch (i) { | |
86 | case 5: | |
87 | byte |= 0x00; | |
88 | break; | |
89 | case 8: | |
90 | byte |= 0x04; | |
91 | break; | |
92 | case 3: | |
93 | byte |= 0x02; | |
94 | break; | |
95 | case 20: | |
96 | byte |= 0x06; | |
97 | break; | |
98 | case 6: | |
99 | byte |= 0x01; | |
100 | break; | |
101 | case 10: | |
102 | byte |= 0x05; | |
103 | break; | |
104 | case 1: | |
105 | byte |= 0x03; | |
106 | break; | |
107 | case 11: | |
108 | byte |= 0x07; | |
109 | break; | |
3ea0a1d1 | 110 | } |
1da177e4 LT |
111 | |
112 | ret = i2c_smbus_write_byte(client, byte); | |
113 | if (ret) { | |
1b8dac15 | 114 | v4l2_dbg(1, debug, sd, |
a832781c | 115 | "i2c_smbus_write_byte() failed, ret:%d\n", ret); |
1da177e4 LT |
116 | return -EIO; |
117 | } | |
1da177e4 LT |
118 | return ret; |
119 | } | |
120 | ||
85d826b0 HV |
121 | /* ----------------------------------------------------------------------- */ |
122 | ||
1b8dac15 HV |
123 | static const struct v4l2_subdev_video_ops tea6415c_video_ops = { |
124 | .s_routing = tea6415c_s_routing, | |
85d826b0 HV |
125 | }; |
126 | ||
127 | static const struct v4l2_subdev_ops tea6415c_ops = { | |
1b8dac15 | 128 | .video = &tea6415c_video_ops, |
85d826b0 HV |
129 | }; |
130 | ||
a832781c HV |
131 | static int tea6415c_probe(struct i2c_client *client, |
132 | const struct i2c_device_id *id) | |
1da177e4 | 133 | { |
85d826b0 HV |
134 | struct v4l2_subdev *sd; |
135 | ||
a832781c HV |
136 | /* let's see whether this adapter can support what we need */ |
137 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) | |
76e4a9a7 | 138 | return -EIO; |
a832781c HV |
139 | |
140 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
141 | client->addr << 1, client->adapter->name); | |
c02b211d | 142 | sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); |
85d826b0 HV |
143 | if (sd == NULL) |
144 | return -ENOMEM; | |
145 | v4l2_i2c_subdev_init(sd, client, &tea6415c_ops); | |
146 | return 0; | |
147 | } | |
148 | ||
149 | static int tea6415c_remove(struct i2c_client *client) | |
150 | { | |
151 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
152 | ||
153 | v4l2_device_unregister_subdev(sd); | |
a832781c | 154 | return 0; |
1da177e4 LT |
155 | } |
156 | ||
a832781c HV |
157 | static const struct i2c_device_id tea6415c_id[] = { |
158 | { "tea6415c", 0 }, | |
159 | { } | |
160 | }; | |
161 | MODULE_DEVICE_TABLE(i2c, tea6415c_id); | |
1da177e4 | 162 | |
0c748826 HV |
163 | static struct i2c_driver tea6415c_driver = { |
164 | .driver = { | |
165 | .owner = THIS_MODULE, | |
166 | .name = "tea6415c", | |
167 | }, | |
168 | .probe = tea6415c_probe, | |
169 | .remove = tea6415c_remove, | |
170 | .id_table = tea6415c_id, | |
a832781c | 171 | }; |
0c748826 | 172 | |
c6e8d86f | 173 | module_i2c_driver(tea6415c_driver); |