Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | tda9840 - i2c-driver for the tda9840 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 tda9840 is a stereo/dual sound processor with digital | |
8 | identification. It can be found at address 0x84 on the i2c-bus. | |
9 | ||
10 | For detailed informations download the specifications directly | |
11 | from SGS Thomson at http://www.st.com | |
12 | ||
13 | This program is free software; you can redistribute it and/or modify | |
14 | it under the terms of the GNU General Public License as published by | |
15 | the Free Software Foundation; either version 2 of the License, or | |
16 | (at your option) any later version. | |
17 | ||
18 | This program is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
24 | along with this program; if not, write to the Free Software | |
25 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | */ | |
27 | ||
a8733ca5 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | #include <linux/ioctl.h> | |
31 | #include <linux/i2c.h> | |
a832781c HV |
32 | #include <media/v4l2-common.h> |
33 | #include <media/v4l2-i2c-drv-legacy.h> | |
1da177e4 LT |
34 | #include "tda9840.h" |
35 | ||
a832781c HV |
36 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
37 | MODULE_DESCRIPTION("tda9840 driver"); | |
38 | MODULE_LICENSE("GPL"); | |
39 | ||
40 | static int debug; | |
1da177e4 | 41 | module_param(debug, int, 0644); |
f87086e3 | 42 | |
a832781c | 43 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
1da177e4 LT |
44 | |
45 | #define SWITCH 0x00 | |
46 | #define LEVEL_ADJUST 0x02 | |
47 | #define STEREO_ADJUST 0x03 | |
48 | #define TEST 0x04 | |
49 | ||
50 | /* addresses to scan, found only at 0x42 (7-Bit) */ | |
09df1c16 | 51 | static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END }; |
1da177e4 LT |
52 | |
53 | /* magic definition of all other variables and things */ | |
54 | I2C_CLIENT_INSMOD; | |
55 | ||
a832781c HV |
56 | static void tda9840_write(struct i2c_client *client, u8 reg, u8 val) |
57 | { | |
58 | if (i2c_smbus_write_byte_data(client, reg, val)) | |
59 | v4l_dbg(1, debug, client, "error writing %02x to %02x\n", | |
60 | val, reg); | |
61 | } | |
1da177e4 | 62 | |
a832781c | 63 | static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg) |
1da177e4 LT |
64 | { |
65 | int result; | |
66 | int byte = *(int *)arg; | |
67 | ||
68 | switch (cmd) { | |
69 | case TDA9840_SWITCH: | |
a832781c | 70 | v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte); |
1da177e4 LT |
71 | |
72 | if (byte != TDA9840_SET_MONO | |
73 | && byte != TDA9840_SET_MUTE | |
74 | && byte != TDA9840_SET_STEREO | |
75 | && byte != TDA9840_SET_LANG1 | |
76 | && byte != TDA9840_SET_LANG2 | |
77 | && byte != TDA9840_SET_BOTH | |
78 | && byte != TDA9840_SET_BOTH_R | |
79 | && byte != TDA9840_SET_EXTERNAL) { | |
80 | return -EINVAL; | |
81 | } | |
82 | ||
a832781c | 83 | tda9840_write(client, SWITCH, byte); |
1da177e4 LT |
84 | break; |
85 | ||
86 | case TDA9840_LEVEL_ADJUST: | |
a832781c | 87 | v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte); |
1da177e4 LT |
88 | |
89 | /* check for correct range */ | |
90 | if (byte > 25 || byte < -20) | |
91 | return -EINVAL; | |
92 | ||
93 | /* calculate actual value to set, see specs, page 18 */ | |
94 | byte /= 5; | |
95 | if (0 < byte) | |
96 | byte += 0x8; | |
97 | else | |
98 | byte = -byte; | |
a832781c | 99 | tda9840_write(client, LEVEL_ADJUST, byte); |
1da177e4 LT |
100 | break; |
101 | ||
102 | case TDA9840_STEREO_ADJUST: | |
a832781c | 103 | v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte); |
1da177e4 LT |
104 | |
105 | /* check for correct range */ | |
106 | if (byte > 25 || byte < -24) | |
107 | return -EINVAL; | |
108 | ||
109 | /* calculate actual value to set */ | |
110 | byte /= 5; | |
111 | if (0 < byte) | |
112 | byte += 0x20; | |
113 | else | |
114 | byte = -byte; | |
115 | ||
a832781c | 116 | tda9840_write(client, STEREO_ADJUST, byte); |
1da177e4 LT |
117 | break; |
118 | ||
119 | case TDA9840_DETECT: { | |
120 | int *ret = (int *)arg; | |
121 | ||
122 | byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST); | |
123 | if (byte == -1) { | |
a832781c HV |
124 | v4l_dbg(1, debug, client, |
125 | "i2c_smbus_read_byte_data() failed\n"); | |
1da177e4 LT |
126 | return -EIO; |
127 | } | |
128 | ||
a832781c HV |
129 | if (byte & 0x80) { |
130 | v4l_dbg(1, debug, client, | |
131 | "TDA9840_DETECT: register contents invalid\n"); | |
1da177e4 LT |
132 | return -EINVAL; |
133 | } | |
134 | ||
a832781c HV |
135 | v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte); |
136 | *ret = (byte & 0x60) >> 5; | |
1da177e4 LT |
137 | result = 0; |
138 | break; | |
139 | } | |
140 | case TDA9840_TEST: | |
a832781c | 141 | v4l_dbg(1, debug, client, "TDA9840_TEST: 0x%02x\n", byte); |
1da177e4 LT |
142 | |
143 | /* mask out irrelevant bits */ | |
144 | byte &= 0x3; | |
145 | ||
a832781c | 146 | tda9840_write(client, TEST, byte); |
1da177e4 LT |
147 | break; |
148 | default: | |
149 | return -ENOIOCTLCMD; | |
150 | } | |
151 | ||
152 | if (result) | |
153 | return -EIO; | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
a832781c HV |
158 | static int tda9840_probe(struct i2c_client *client, |
159 | const struct i2c_device_id *id) | |
1da177e4 | 160 | { |
a832781c HV |
161 | int result; |
162 | int byte; | |
1da177e4 LT |
163 | |
164 | /* let's see whether this adapter can support what we need */ | |
a832781c HV |
165 | if (!i2c_check_functionality(client->adapter, |
166 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
167 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) | |
1da177e4 | 168 | return 0; |
1da177e4 | 169 | |
a832781c HV |
170 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
171 | client->addr << 1, client->adapter->name); | |
1da177e4 LT |
172 | |
173 | /* set initial values for level & stereo - adjustment, mode */ | |
174 | byte = 0; | |
a832781c HV |
175 | result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte); |
176 | result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte); | |
1da177e4 | 177 | byte = TDA9840_SET_MONO; |
a832781c | 178 | result = tda9840_command(client, TDA9840_SWITCH, &byte); |
1da177e4 | 179 | if (result) { |
a832781c | 180 | v4l_dbg(1, debug, client, "could not initialize tda9840\n"); |
1da177e4 LT |
181 | return -ENODEV; |
182 | } | |
1da177e4 LT |
183 | return 0; |
184 | } | |
185 | ||
a832781c | 186 | static int tda9840_legacy_probe(struct i2c_adapter *adapter) |
1da177e4 | 187 | { |
a832781c HV |
188 | /* Let's see whether this is a known adapter we can attach to. |
189 | Prevents conflicts with tvaudio.c. */ | |
190 | return adapter->id == I2C_HW_SAA7146; | |
1da177e4 | 191 | } |
a832781c HV |
192 | static const struct i2c_device_id tda9840_id[] = { |
193 | { "tda9840", 0 }, | |
194 | { } | |
1da177e4 | 195 | }; |
a832781c | 196 | MODULE_DEVICE_TABLE(i2c, tda9840_id); |
1da177e4 | 197 | |
a832781c | 198 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
fae91e72 | 199 | .name = "tda9840", |
a832781c HV |
200 | .driverid = I2C_DRIVERID_TDA9840, |
201 | .command = tda9840_command, | |
202 | .probe = tda9840_probe, | |
203 | .legacy_probe = tda9840_legacy_probe, | |
204 | .id_table = tda9840_id, | |
1da177e4 | 205 | }; |