1 /*
2 tea6415c - i2c-driver for the tea6415c by SGS Thomson
3
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
5 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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
30
31 #include <linux/module.h>
32 #include <linux/ioctl.h>
33 #include <linux/slab.h>
34 #include <linux/i2c.h>
35 #include <media/v4l2-device.h>
36 #include <media/v4l2-chip-ident.h>
37 #include "tea6415c.h"
38
39 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
40 MODULE_DESCRIPTION("tea6415c driver");
41 MODULE_LICENSE("GPL");
42
43 static int debug;
44 module_param(debug, int, 0644);
45
46 MODULE_PARM_DESC(debug, "Debug level (0-1)");
47
48
49 /* makes a connection between the input-pin 'i' and the output-pin 'o' */
tea6415c_s_routing(struct v4l2_subdev * sd,u32 i,u32 o,u32 config)50 static int tea6415c_s_routing(struct v4l2_subdev *sd,
51 u32 i, u32 o, u32 config)
52 {
53 struct i2c_client *client = v4l2_get_subdevdata(sd);
54 u8 byte = 0;
55 int ret;
56
57 v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
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)))
62 return -EINVAL;
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) {
115 v4l2_dbg(1, debug, sd,
116 "i2c_smbus_write_byte() failed, ret:%d\n", ret);
117 return -EIO;
118 }
119 return ret;
120 }
121
tea6415c_g_chip_ident(struct v4l2_subdev * sd,struct v4l2_dbg_chip_ident * chip)122 static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
123 {
124 struct i2c_client *client = v4l2_get_subdevdata(sd);
125
126 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
127 }
128
129 /* ----------------------------------------------------------------------- */
130
131 static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
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,
137 };
138
139 static const struct v4l2_subdev_ops tea6415c_ops = {
140 .core = &tea6415c_core_ops,
141 .video = &tea6415c_video_ops,
142 };
143
tea6415c_probe(struct i2c_client * client,const struct i2c_device_id * id)144 static int tea6415c_probe(struct i2c_client *client,
145 const struct i2c_device_id *id)
146 {
147 struct v4l2_subdev *sd;
148
149 /* let's see whether this adapter can support what we need */
150 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
151 return -EIO;
152
153 v4l_info(client, "chip found @ 0x%x (%s)\n",
154 client->addr << 1, client->adapter->name);
155 sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
156 if (sd == NULL)
157 return -ENOMEM;
158 v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
159 return 0;
160 }
161
tea6415c_remove(struct i2c_client * client)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);
168 return 0;
169 }
170
171 static const struct i2c_device_id tea6415c_id[] = {
172 { "tea6415c", 0 },
173 { }
174 };
175 MODULE_DEVICE_TABLE(i2c, tea6415c_id);
176
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,
185 };
186
init_tea6415c(void)187 static __init int init_tea6415c(void)
188 {
189 return i2c_add_driver(&tea6415c_driver);
190 }
191
exit_tea6415c(void)192 static __exit void exit_tea6415c(void)
193 {
194 i2c_del_driver(&tea6415c_driver);
195 }
196
197 module_init(init_tea6415c);
198 module_exit(exit_tea6415c);
199