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> |
1b8dac15 | 36 | #include <media/v4l2-chip-ident.h> |
1da177e4 LT |
37 | #include "tea6415c.h" |
38 | ||
a832781c HV |
39 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
40 | MODULE_DESCRIPTION("tea6415c driver"); | |
41 | MODULE_LICENSE("GPL"); | |
f87086e3 | 42 | |
a832781c HV |
43 | static int debug; |
44 | module_param(debug, int, 0644); | |
1da177e4 | 45 | |
a832781c | 46 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
1da177e4 | 47 | |
1da177e4 | 48 | |
1b8dac15 | 49 | /* makes a connection between the input-pin 'i' and the output-pin 'o' */ |
5325b427 HV |
50 | static int tea6415c_s_routing(struct v4l2_subdev *sd, |
51 | u32 i, u32 o, u32 config) | |
1da177e4 | 52 | { |
1b8dac15 | 53 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
1da177e4 LT |
54 | u8 byte = 0; |
55 | int ret; | |
a8733ca5 | 56 | |
1b8dac15 | 57 | v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o); |
1da177e4 LT |
58 | |
59 | /* check if the pins are valid */ | |
60 | if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) | |
61 | && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) | |
1b8dac15 | 62 | return -EINVAL; |
1da177e4 LT |
63 | |
64 | /* to understand this, have a look at the tea6415c-specs (p.5) */ | |
65 | switch (o) { | |
66 | case 18: | |
67 | byte = 0x00; | |
68 | break; | |
69 | case 14: | |
70 | byte = 0x20; | |
71 | break; | |
72 | case 16: | |
73 | byte = 0x10; | |
74 | break; | |
75 | case 17: | |
76 | byte = 0x08; | |
77 | break; | |
78 | case 15: | |
79 | byte = 0x18; | |
80 | break; | |
81 | case 13: | |
82 | byte = 0x28; | |
83 | break; | |
84 | }; | |
85 | ||
86 | switch (i) { | |
87 | case 5: | |
88 | byte |= 0x00; | |
89 | break; | |
90 | case 8: | |
91 | byte |= 0x04; | |
92 | break; | |
93 | case 3: | |
94 | byte |= 0x02; | |
95 | break; | |
96 | case 20: | |
97 | byte |= 0x06; | |
98 | break; | |
99 | case 6: | |
100 | byte |= 0x01; | |
101 | break; | |
102 | case 10: | |
103 | byte |= 0x05; | |
104 | break; | |
105 | case 1: | |
106 | byte |= 0x03; | |
107 | break; | |
108 | case 11: | |
109 | byte |= 0x07; | |
110 | break; | |
111 | }; | |
112 | ||
113 | ret = i2c_smbus_write_byte(client, byte); | |
114 | if (ret) { | |
1b8dac15 | 115 | v4l2_dbg(1, debug, sd, |
a832781c | 116 | "i2c_smbus_write_byte() failed, ret:%d\n", ret); |
1da177e4 LT |
117 | return -EIO; |
118 | } | |
1da177e4 LT |
119 | return ret; |
120 | } | |
121 | ||
1b8dac15 | 122 | static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) |
1da177e4 | 123 | { |
1b8dac15 | 124 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
1da177e4 | 125 | |
1b8dac15 | 126 | return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0); |
85d826b0 HV |
127 | } |
128 | ||
129 | /* ----------------------------------------------------------------------- */ | |
130 | ||
131 | static const struct v4l2_subdev_core_ops tea6415c_core_ops = { | |
1b8dac15 HV |
132 | .g_chip_ident = tea6415c_g_chip_ident, |
133 | }; | |
134 | ||
135 | static const struct v4l2_subdev_video_ops tea6415c_video_ops = { | |
136 | .s_routing = tea6415c_s_routing, | |
85d826b0 HV |
137 | }; |
138 | ||
139 | static const struct v4l2_subdev_ops tea6415c_ops = { | |
140 | .core = &tea6415c_core_ops, | |
1b8dac15 | 141 | .video = &tea6415c_video_ops, |
85d826b0 HV |
142 | }; |
143 | ||
a832781c HV |
144 | static int tea6415c_probe(struct i2c_client *client, |
145 | const struct i2c_device_id *id) | |
1da177e4 | 146 | { |
85d826b0 HV |
147 | struct v4l2_subdev *sd; |
148 | ||
a832781c HV |
149 | /* let's see whether this adapter can support what we need */ |
150 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) | |
76e4a9a7 | 151 | return -EIO; |
a832781c HV |
152 | |
153 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
154 | client->addr << 1, client->adapter->name); | |
80845a33 | 155 | sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); |
85d826b0 HV |
156 | if (sd == NULL) |
157 | return -ENOMEM; | |
158 | v4l2_i2c_subdev_init(sd, client, &tea6415c_ops); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static int tea6415c_remove(struct i2c_client *client) | |
163 | { | |
164 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
165 | ||
166 | v4l2_device_unregister_subdev(sd); | |
167 | kfree(sd); | |
a832781c | 168 | return 0; |
1da177e4 LT |
169 | } |
170 | ||
a832781c HV |
171 | static const struct i2c_device_id tea6415c_id[] = { |
172 | { "tea6415c", 0 }, | |
173 | { } | |
174 | }; | |
175 | MODULE_DEVICE_TABLE(i2c, tea6415c_id); | |
1da177e4 | 176 | |
0c748826 HV |
177 | static struct i2c_driver tea6415c_driver = { |
178 | .driver = { | |
179 | .owner = THIS_MODULE, | |
180 | .name = "tea6415c", | |
181 | }, | |
182 | .probe = tea6415c_probe, | |
183 | .remove = tea6415c_remove, | |
184 | .id_table = tea6415c_id, | |
a832781c | 185 | }; |
0c748826 | 186 | |
c6e8d86f | 187 | module_i2c_driver(tea6415c_driver); |