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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> | |
33 | #include <linux/i2c.h> | |
85d826b0 | 34 | #include <media/v4l2-device.h> |
a832781c | 35 | #include <media/v4l2-i2c-drv-legacy.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 LT |
46 | |
47 | /* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */ | |
48 | static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END }; | |
1da177e4 LT |
49 | |
50 | /* magic definition of all other variables and things */ | |
51 | I2C_CLIENT_INSMOD; | |
52 | ||
1da177e4 LT |
53 | /* makes a connection between the input-pin 'i' and the output-pin 'o' |
54 | for the tea6415c-client 'client' */ | |
55 | static int switch_matrix(struct i2c_client *client, int i, int o) | |
56 | { | |
57 | u8 byte = 0; | |
58 | int ret; | |
a8733ca5 | 59 | |
a832781c | 60 | v4l_dbg(1, debug, client, "i=%d, o=%d\n", i, o); |
1da177e4 LT |
61 | |
62 | /* check if the pins are valid */ | |
63 | if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) | |
64 | && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) | |
65 | return -1; | |
66 | ||
67 | /* to understand this, have a look at the tea6415c-specs (p.5) */ | |
68 | switch (o) { | |
69 | case 18: | |
70 | byte = 0x00; | |
71 | break; | |
72 | case 14: | |
73 | byte = 0x20; | |
74 | break; | |
75 | case 16: | |
76 | byte = 0x10; | |
77 | break; | |
78 | case 17: | |
79 | byte = 0x08; | |
80 | break; | |
81 | case 15: | |
82 | byte = 0x18; | |
83 | break; | |
84 | case 13: | |
85 | byte = 0x28; | |
86 | break; | |
87 | }; | |
88 | ||
89 | switch (i) { | |
90 | case 5: | |
91 | byte |= 0x00; | |
92 | break; | |
93 | case 8: | |
94 | byte |= 0x04; | |
95 | break; | |
96 | case 3: | |
97 | byte |= 0x02; | |
98 | break; | |
99 | case 20: | |
100 | byte |= 0x06; | |
101 | break; | |
102 | case 6: | |
103 | byte |= 0x01; | |
104 | break; | |
105 | case 10: | |
106 | byte |= 0x05; | |
107 | break; | |
108 | case 1: | |
109 | byte |= 0x03; | |
110 | break; | |
111 | case 11: | |
112 | byte |= 0x07; | |
113 | break; | |
114 | }; | |
115 | ||
116 | ret = i2c_smbus_write_byte(client, byte); | |
117 | if (ret) { | |
a832781c HV |
118 | v4l_dbg(1, debug, client, |
119 | "i2c_smbus_write_byte() failed, ret:%d\n", ret); | |
1da177e4 LT |
120 | return -EIO; |
121 | } | |
1da177e4 LT |
122 | return ret; |
123 | } | |
124 | ||
069b7479 | 125 | static long tea6415c_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg) |
1da177e4 | 126 | { |
85d826b0 HV |
127 | if (cmd == TEA6415C_SWITCH) { |
128 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
129 | struct tea6415c_multiplex *v = (struct tea6415c_multiplex *)arg; | |
1da177e4 | 130 | |
85d826b0 | 131 | return switch_matrix(client, v->in, v->out); |
1da177e4 | 132 | } |
85d826b0 | 133 | return -ENOIOCTLCMD; |
1da177e4 LT |
134 | } |
135 | ||
85d826b0 HV |
136 | static int tea6415c_command(struct i2c_client *client, unsigned cmd, void *arg) |
137 | { | |
138 | return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg); | |
139 | } | |
140 | ||
141 | /* ----------------------------------------------------------------------- */ | |
142 | ||
143 | static const struct v4l2_subdev_core_ops tea6415c_core_ops = { | |
144 | .ioctl = tea6415c_ioctl, | |
145 | }; | |
146 | ||
147 | static const struct v4l2_subdev_ops tea6415c_ops = { | |
148 | .core = &tea6415c_core_ops, | |
149 | }; | |
150 | ||
a832781c HV |
151 | /* this function is called by i2c_probe */ |
152 | static int tea6415c_probe(struct i2c_client *client, | |
153 | const struct i2c_device_id *id) | |
1da177e4 | 154 | { |
85d826b0 HV |
155 | struct v4l2_subdev *sd; |
156 | ||
a832781c HV |
157 | /* let's see whether this adapter can support what we need */ |
158 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) | |
159 | return 0; | |
160 | ||
161 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
162 | client->addr << 1, client->adapter->name); | |
85d826b0 HV |
163 | sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); |
164 | if (sd == NULL) | |
165 | return -ENOMEM; | |
166 | v4l2_i2c_subdev_init(sd, client, &tea6415c_ops); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int tea6415c_remove(struct i2c_client *client) | |
171 | { | |
172 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
173 | ||
174 | v4l2_device_unregister_subdev(sd); | |
175 | kfree(sd); | |
a832781c | 176 | return 0; |
1da177e4 LT |
177 | } |
178 | ||
a832781c | 179 | static int tea6415c_legacy_probe(struct i2c_adapter *adapter) |
1da177e4 | 180 | { |
a832781c HV |
181 | /* Let's see whether this is a known adapter we can attach to. |
182 | Prevents conflicts with tvaudio.c. */ | |
183 | return adapter->id == I2C_HW_SAA7146; | |
1da177e4 LT |
184 | } |
185 | ||
a832781c HV |
186 | static const struct i2c_device_id tea6415c_id[] = { |
187 | { "tea6415c", 0 }, | |
188 | { } | |
189 | }; | |
190 | MODULE_DEVICE_TABLE(i2c, tea6415c_id); | |
1da177e4 | 191 | |
a832781c HV |
192 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
193 | .name = "tea6415c", | |
a832781c HV |
194 | .command = tea6415c_command, |
195 | .probe = tea6415c_probe, | |
85d826b0 | 196 | .remove = tea6415c_remove, |
a832781c HV |
197 | .legacy_probe = tea6415c_legacy_probe, |
198 | .id_table = tea6415c_id, | |
199 | }; |