Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | tea6420 - i2c-driver for the tea6420 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 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 adresses 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 | ||
a8733ca5 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | #include <linux/ioctl.h> | |
33 | #include <linux/i2c.h> | |
2a5b828d | 34 | #include <media/v4l2-device.h> |
a832781c | 35 | #include <media/v4l2-i2c-drv-legacy.h> |
1da177e4 LT |
36 | #include "tea6420.h" |
37 | ||
a832781c HV |
38 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
39 | MODULE_DESCRIPTION("tea6420 driver"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | ||
42 | static int debug; | |
1da177e4 | 43 | module_param(debug, int, 0644); |
f87086e3 | 44 | |
a832781c | 45 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
1da177e4 LT |
46 | |
47 | /* addresses to scan, found only at 0x4c and/or 0x4d (7-Bit) */ | |
09df1c16 | 48 | static unsigned short normal_i2c[] = { I2C_ADDR_TEA6420_1, I2C_ADDR_TEA6420_2, I2C_CLIENT_END }; |
1da177e4 LT |
49 | |
50 | /* magic definition of all other variables and things */ | |
51 | I2C_CLIENT_INSMOD; | |
52 | ||
1da177e4 LT |
53 | /* make a connection between the input 'i' and the output 'o' |
54 | with gain 'g' for the tea6420-client 'client' (note: i = 6 means 'mute') */ | |
55 | static int tea6420_switch(struct i2c_client *client, int i, int o, int g) | |
56 | { | |
a832781c | 57 | u8 byte; |
1da177e4 LT |
58 | int ret; |
59 | ||
a832781c | 60 | v4l_dbg(1, debug, client, "i=%d, o=%d, g=%d\n", i, o, g); |
1da177e4 | 61 | |
c84e6036 | 62 | /* check if the parameters are valid */ |
1da177e4 LT |
63 | if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0) |
64 | return -1; | |
65 | ||
a832781c | 66 | byte = ((o - 1) << 5); |
1da177e4 LT |
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) { | |
a832781c HV |
86 | v4l_dbg(1, debug, client, |
87 | "i2c_smbus_write_byte() failed, ret:%d\n", ret); | |
1da177e4 LT |
88 | return -EIO; |
89 | } | |
1da177e4 LT |
90 | return 0; |
91 | } | |
92 | ||
069b7479 | 93 | static long tea6420_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg) |
1da177e4 | 94 | { |
2a5b828d HV |
95 | if (cmd == TEA6420_SWITCH) { |
96 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
97 | struct tea6420_multiplex *a = (struct tea6420_multiplex *)arg; | |
1da177e4 | 98 | |
2a5b828d | 99 | return tea6420_switch(client, a->in, a->out, a->gain); |
1da177e4 | 100 | } |
2a5b828d HV |
101 | return -ENOIOCTLCMD; |
102 | } | |
1da177e4 | 103 | |
2a5b828d HV |
104 | static int tea6420_command(struct i2c_client *client, unsigned cmd, void *arg) |
105 | { | |
106 | return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg); | |
a832781c | 107 | } |
1da177e4 | 108 | |
2a5b828d HV |
109 | /* ----------------------------------------------------------------------- */ |
110 | ||
111 | static const struct v4l2_subdev_core_ops tea6420_core_ops = { | |
112 | .ioctl = tea6420_ioctl, | |
113 | }; | |
114 | ||
115 | static const struct v4l2_subdev_ops tea6420_ops = { | |
116 | .core = &tea6420_core_ops, | |
117 | }; | |
118 | ||
a832781c HV |
119 | /* this function is called by i2c_probe */ |
120 | static int tea6420_probe(struct i2c_client *client, | |
121 | const struct i2c_device_id *id) | |
122 | { | |
2a5b828d | 123 | struct v4l2_subdev *sd; |
a832781c | 124 | int err, i; |
1da177e4 | 125 | |
a832781c HV |
126 | /* let's see whether this adapter can support what we need */ |
127 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) | |
128 | return -EIO; | |
129 | ||
130 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
131 | client->addr << 1, client->adapter->name); | |
1da177e4 LT |
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_switch(client, 6, i, 0); | |
137 | } | |
138 | if (err) { | |
a832781c | 139 | v4l_dbg(1, debug, client, "could not initialize tea6420\n"); |
1da177e4 LT |
140 | return -ENODEV; |
141 | } | |
2a5b828d HV |
142 | |
143 | sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); | |
144 | if (sd == NULL) | |
145 | return -ENOMEM; | |
146 | v4l2_i2c_subdev_init(sd, client, &tea6420_ops); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int tea6420_remove(struct i2c_client *client) | |
151 | { | |
152 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
153 | ||
154 | v4l2_device_unregister_subdev(sd); | |
155 | kfree(sd); | |
1da177e4 LT |
156 | return 0; |
157 | } | |
158 | ||
a832781c | 159 | static int tea6420_legacy_probe(struct i2c_adapter *adapter) |
1da177e4 | 160 | { |
a832781c HV |
161 | /* Let's see whether this is a known adapter we can attach to. |
162 | Prevents conflicts with tvaudio.c. */ | |
163 | return adapter->id == I2C_HW_SAA7146; | |
1da177e4 LT |
164 | } |
165 | ||
a832781c HV |
166 | static const struct i2c_device_id tea6420_id[] = { |
167 | { "tea6420", 0 }, | |
168 | { } | |
1da177e4 | 169 | }; |
a832781c | 170 | MODULE_DEVICE_TABLE(i2c, tea6420_id); |
1da177e4 | 171 | |
a832781c | 172 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
fae91e72 | 173 | .name = "tea6420", |
a832781c HV |
174 | .driverid = I2C_DRIVERID_TEA6420, |
175 | .command = tea6420_command, | |
176 | .probe = tea6420_probe, | |
2a5b828d | 177 | .remove = tea6420_remove, |
a832781c HV |
178 | .legacy_probe = tea6420_legacy_probe, |
179 | .id_table = tea6420_id, | |
1da177e4 | 180 | }; |