diff options
Diffstat (limited to 'drivers/media/video/tea6420.c')
-rw-r--r-- | drivers/media/video/tea6420.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/drivers/media/video/tea6420.c b/drivers/media/video/tea6420.c new file mode 100644 index 00000000000..f350b6c2450 --- /dev/null +++ b/drivers/media/video/tea6420.c | |||
@@ -0,0 +1,180 @@ | |||
1 | /* | ||
2 | tea6420 - i2c-driver for the tea6420 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 tea6420 is a bus controlled audio-matrix with 5 stereo inputs, | ||
8 | 4 stereo outputs and gain control for each output. | ||
9 | It is cascadable, i.e. it can be found at the addresses 0x98 | ||
10 | and 0x9a 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 as 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 Mass 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 "tea6420.h" | ||
38 | |||
39 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); | ||
40 | MODULE_DESCRIPTION("tea6420 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 | /* make a connection between the input 'i' and the output 'o' | ||
50 | with gain 'g' (note: i = 6 means 'mute') */ | ||
51 | static int tea6420_s_routing(struct v4l2_subdev *sd, | ||
52 | u32 i, u32 o, u32 config) | ||
53 | { | ||
54 | struct i2c_client *client = v4l2_get_subdevdata(sd); | ||
55 | int g = (o >> 4) & 0xf; | ||
56 | u8 byte; | ||
57 | int ret; | ||
58 | |||
59 | o &= 0xf; | ||
60 | v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g); | ||
61 | |||
62 | /* check if the parameters are valid */ | ||
63 | if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0) | ||
64 | return -EINVAL; | ||
65 | |||
66 | byte = ((o - 1) << 5); | ||
67 | byte |= (i - 1); | ||
68 | |||
69 | /* to understand this, have a look at the tea6420-specs (p.5) */ | ||
70 | switch (g) { | ||
71 | case 0: | ||
72 | byte |= (3 << 3); | ||
73 | break; | ||
74 | case 2: | ||
75 | byte |= (2 << 3); | ||
76 | break; | ||
77 | case 4: | ||
78 | byte |= (1 << 3); | ||
79 | break; | ||
80 | case 6: | ||
81 | break; | ||
82 | } | ||
83 | |||
84 | ret = i2c_smbus_write_byte(client, byte); | ||
85 | if (ret) { | ||
86 | v4l2_dbg(1, debug, sd, | ||
87 | "i2c_smbus_write_byte() failed, ret:%d\n", ret); | ||
88 | return -EIO; | ||
89 | } | ||
90 | return 0; | ||
91 | } | ||
92 | |||
93 | static int tea6420_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) | ||
94 | { | ||
95 | struct i2c_client *client = v4l2_get_subdevdata(sd); | ||
96 | |||
97 | return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6420, 0); | ||
98 | } | ||
99 | |||
100 | /* ----------------------------------------------------------------------- */ | ||
101 | |||
102 | static const struct v4l2_subdev_core_ops tea6420_core_ops = { | ||
103 | .g_chip_ident = tea6420_g_chip_ident, | ||
104 | }; | ||
105 | |||
106 | static const struct v4l2_subdev_audio_ops tea6420_audio_ops = { | ||
107 | .s_routing = tea6420_s_routing, | ||
108 | }; | ||
109 | |||
110 | static const struct v4l2_subdev_ops tea6420_ops = { | ||
111 | .core = &tea6420_core_ops, | ||
112 | .audio = &tea6420_audio_ops, | ||
113 | }; | ||
114 | |||
115 | static int tea6420_probe(struct i2c_client *client, | ||
116 | const struct i2c_device_id *id) | ||
117 | { | ||
118 | struct v4l2_subdev *sd; | ||
119 | int err, i; | ||
120 | |||
121 | /* let's see whether this adapter can support what we need */ | ||
122 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) | ||
123 | return -EIO; | ||
124 | |||
125 | v4l_info(client, "chip found @ 0x%x (%s)\n", | ||
126 | client->addr << 1, client->adapter->name); | ||
127 | |||
128 | sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); | ||
129 | if (sd == NULL) | ||
130 | return -ENOMEM; | ||
131 | v4l2_i2c_subdev_init(sd, client, &tea6420_ops); | ||
132 | |||
133 | /* set initial values: set "mute"-input to all outputs at gain 0 */ | ||
134 | err = 0; | ||
135 | for (i = 1; i < 5; i++) | ||
136 | err += tea6420_s_routing(sd, 6, i, 0); | ||
137 | if (err) { | ||
138 | v4l_dbg(1, debug, client, "could not initialize tea6420\n"); | ||
139 | return -ENODEV; | ||
140 | } | ||
141 | return 0; | ||
142 | } | ||
143 | |||
144 | static int tea6420_remove(struct i2c_client *client) | ||
145 | { | ||
146 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | ||
147 | |||
148 | v4l2_device_unregister_subdev(sd); | ||
149 | kfree(sd); | ||
150 | return 0; | ||
151 | } | ||
152 | |||
153 | static const struct i2c_device_id tea6420_id[] = { | ||
154 | { "tea6420", 0 }, | ||
155 | { } | ||
156 | }; | ||
157 | MODULE_DEVICE_TABLE(i2c, tea6420_id); | ||
158 | |||
159 | static struct i2c_driver tea6420_driver = { | ||
160 | .driver = { | ||
161 | .owner = THIS_MODULE, | ||
162 | .name = "tea6420", | ||
163 | }, | ||
164 | .probe = tea6420_probe, | ||
165 | .remove = tea6420_remove, | ||
166 | .id_table = tea6420_id, | ||
167 | }; | ||
168 | |||
169 | static __init int init_tea6420(void) | ||
170 | { | ||
171 | return i2c_add_driver(&tea6420_driver); | ||
172 | } | ||
173 | |||
174 | static __exit void exit_tea6420(void) | ||
175 | { | ||
176 | i2c_del_driver(&tea6420_driver); | ||
177 | } | ||
178 | |||
179 | module_init(init_tea6420); | ||
180 | module_exit(exit_tea6420); | ||