1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | tea6415c - i2c-driver for the tea6415c by SGS Thomson |
4 | |
5 | Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> |
6 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
7 | |
8 | The tea6415c is a bus controlled video-matrix-switch |
9 | with 8 inputs and 6 outputs. |
10 | It is cascadable, i.e. it can be found at the addresses |
11 | 0x86 and 0x06 on the i2c-bus. |
12 | |
13 | For detailed information download the specifications directly |
14 | from SGS Thomson at http://www.st.com |
15 | |
16 | */ |
17 | |
18 | |
19 | #include <linux/module.h> |
20 | #include <linux/ioctl.h> |
21 | #include <linux/slab.h> |
22 | #include <linux/i2c.h> |
23 | #include <media/v4l2-device.h> |
24 | #include "tea6415c.h" |
25 | |
26 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>" ); |
27 | MODULE_DESCRIPTION("tea6415c driver" ); |
28 | MODULE_LICENSE("GPL" ); |
29 | |
30 | static int debug; |
31 | module_param(debug, int, 0644); |
32 | |
33 | MODULE_PARM_DESC(debug, "Debug level (0-1)" ); |
34 | |
35 | |
36 | /* makes a connection between the input-pin 'i' and the output-pin 'o' */ |
37 | static int tea6415c_s_routing(struct v4l2_subdev *sd, |
38 | u32 i, u32 o, u32 config) |
39 | { |
40 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
41 | u8 byte = 0; |
42 | int ret; |
43 | |
44 | v4l2_dbg(1, debug, sd, "i=%d, o=%d\n" , i, o); |
45 | |
46 | /* check if the pins are valid */ |
47 | if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) |
48 | && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) |
49 | return -EINVAL; |
50 | |
51 | /* to understand this, have a look at the tea6415c-specs (p.5) */ |
52 | switch (o) { |
53 | case 18: |
54 | byte = 0x00; |
55 | break; |
56 | case 14: |
57 | byte = 0x20; |
58 | break; |
59 | case 16: |
60 | byte = 0x10; |
61 | break; |
62 | case 17: |
63 | byte = 0x08; |
64 | break; |
65 | case 15: |
66 | byte = 0x18; |
67 | break; |
68 | case 13: |
69 | byte = 0x28; |
70 | break; |
71 | } |
72 | |
73 | switch (i) { |
74 | case 5: |
75 | byte |= 0x00; |
76 | break; |
77 | case 8: |
78 | byte |= 0x04; |
79 | break; |
80 | case 3: |
81 | byte |= 0x02; |
82 | break; |
83 | case 20: |
84 | byte |= 0x06; |
85 | break; |
86 | case 6: |
87 | byte |= 0x01; |
88 | break; |
89 | case 10: |
90 | byte |= 0x05; |
91 | break; |
92 | case 1: |
93 | byte |= 0x03; |
94 | break; |
95 | case 11: |
96 | byte |= 0x07; |
97 | break; |
98 | } |
99 | |
100 | ret = i2c_smbus_write_byte(client, value: byte); |
101 | if (ret) { |
102 | v4l2_dbg(1, debug, sd, |
103 | "i2c_smbus_write_byte() failed, ret:%d\n" , ret); |
104 | return -EIO; |
105 | } |
106 | return ret; |
107 | } |
108 | |
109 | /* ----------------------------------------------------------------------- */ |
110 | |
111 | static const struct v4l2_subdev_video_ops tea6415c_video_ops = { |
112 | .s_routing = tea6415c_s_routing, |
113 | }; |
114 | |
115 | static const struct v4l2_subdev_ops tea6415c_ops = { |
116 | .video = &tea6415c_video_ops, |
117 | }; |
118 | |
119 | static int tea6415c_probe(struct i2c_client *client) |
120 | { |
121 | struct v4l2_subdev *sd; |
122 | |
123 | /* let's see whether this adapter can support what we need */ |
124 | if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) |
125 | return -EIO; |
126 | |
127 | v4l_info(client, "chip found @ 0x%x (%s)\n" , |
128 | client->addr << 1, client->adapter->name); |
129 | sd = devm_kzalloc(dev: &client->dev, size: sizeof(*sd), GFP_KERNEL); |
130 | if (sd == NULL) |
131 | return -ENOMEM; |
132 | v4l2_i2c_subdev_init(sd, client, ops: &tea6415c_ops); |
133 | return 0; |
134 | } |
135 | |
136 | static void tea6415c_remove(struct i2c_client *client) |
137 | { |
138 | struct v4l2_subdev *sd = i2c_get_clientdata(client); |
139 | |
140 | v4l2_device_unregister_subdev(sd); |
141 | } |
142 | |
143 | static const struct i2c_device_id tea6415c_id[] = { |
144 | { "tea6415c" , 0 }, |
145 | { } |
146 | }; |
147 | MODULE_DEVICE_TABLE(i2c, tea6415c_id); |
148 | |
149 | static struct i2c_driver tea6415c_driver = { |
150 | .driver = { |
151 | .name = "tea6415c" , |
152 | }, |
153 | .probe = tea6415c_probe, |
154 | .remove = tea6415c_remove, |
155 | .id_table = tea6415c_id, |
156 | }; |
157 | |
158 | module_i2c_driver(tea6415c_driver); |
159 | |