Commit | Line | Data |
---|---|---|
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 | ||
707ecf46 HV |
50 | #define TDA9840_SET_MUTE 0x00 |
51 | #define TDA9840_SET_MONO 0x10 | |
52 | #define TDA9840_SET_STEREO 0x2a | |
53 | #define TDA9840_SET_LANG1 0x12 | |
54 | #define TDA9840_SET_LANG2 0x1e | |
55 | #define TDA9840_SET_BOTH 0x1a | |
56 | #define TDA9840_SET_BOTH_R 0x16 | |
57 | #define TDA9840_SET_EXTERNAL 0x7a | |
58 | ||
1da177e4 | 59 | /* addresses to scan, found only at 0x42 (7-Bit) */ |
09df1c16 | 60 | static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END }; |
1da177e4 LT |
61 | |
62 | /* magic definition of all other variables and things */ | |
63 | I2C_CLIENT_INSMOD; | |
64 | ||
a832781c HV |
65 | static void tda9840_write(struct i2c_client *client, u8 reg, u8 val) |
66 | { | |
67 | if (i2c_smbus_write_byte_data(client, reg, val)) | |
68 | v4l_dbg(1, debug, client, "error writing %02x to %02x\n", | |
69 | val, reg); | |
70 | } | |
1da177e4 | 71 | |
a832781c | 72 | static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg) |
1da177e4 | 73 | { |
1da177e4 LT |
74 | int byte = *(int *)arg; |
75 | ||
76 | switch (cmd) { | |
707ecf46 HV |
77 | case VIDIOC_S_TUNER: { |
78 | struct v4l2_tuner *t = arg; | |
79 | int byte; | |
80 | ||
81 | if (t->index) | |
82 | return -EINVAL; | |
83 | ||
84 | switch (t->audmode) { | |
85 | case V4L2_TUNER_MODE_STEREO: | |
86 | byte = TDA9840_SET_STEREO; | |
87 | break; | |
88 | case V4L2_TUNER_MODE_LANG1_LANG2: | |
89 | byte = TDA9840_SET_BOTH; | |
90 | break; | |
91 | case V4L2_TUNER_MODE_LANG1: | |
92 | byte = TDA9840_SET_LANG1; | |
93 | break; | |
94 | case V4L2_TUNER_MODE_LANG2: | |
95 | byte = TDA9840_SET_LANG2; | |
96 | break; | |
97 | default: | |
98 | byte = TDA9840_SET_MONO; | |
99 | break; | |
100 | } | |
a832781c | 101 | v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte); |
707ecf46 HV |
102 | tda9840_write(client, SWITCH, byte); |
103 | break; | |
104 | } | |
105 | ||
106 | case VIDIOC_G_TUNER: { | |
107 | struct v4l2_tuner *t = arg; | |
108 | u8 byte; | |
1da177e4 | 109 | |
707ecf46 HV |
110 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
111 | if (1 != i2c_master_recv(client, &byte, 1)) { | |
112 | v4l_dbg(1, debug, client, | |
113 | "i2c_master_recv() failed\n"); | |
114 | return -EIO; | |
115 | } | |
116 | ||
117 | if (byte & 0x80) { | |
118 | v4l_dbg(1, debug, client, | |
119 | "TDA9840_DETECT: register contents invalid\n"); | |
1da177e4 LT |
120 | return -EINVAL; |
121 | } | |
122 | ||
707ecf46 HV |
123 | v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte); |
124 | ||
125 | switch (byte & 0x60) { | |
126 | case 0x00: | |
127 | t->rxsubchans = V4L2_TUNER_SUB_MONO; | |
128 | break; | |
129 | case 0x20: | |
130 | t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; | |
131 | break; | |
132 | case 0x40: | |
133 | t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; | |
134 | break; | |
135 | default: /* Incorrect detect */ | |
136 | t->rxsubchans = V4L2_TUNER_MODE_MONO; | |
137 | break; | |
138 | } | |
1da177e4 | 139 | break; |
707ecf46 | 140 | } |
1da177e4 LT |
141 | |
142 | case TDA9840_LEVEL_ADJUST: | |
a832781c | 143 | v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte); |
1da177e4 LT |
144 | |
145 | /* check for correct range */ | |
146 | if (byte > 25 || byte < -20) | |
147 | return -EINVAL; | |
148 | ||
149 | /* calculate actual value to set, see specs, page 18 */ | |
150 | byte /= 5; | |
151 | if (0 < byte) | |
152 | byte += 0x8; | |
153 | else | |
154 | byte = -byte; | |
a832781c | 155 | tda9840_write(client, LEVEL_ADJUST, byte); |
1da177e4 LT |
156 | break; |
157 | ||
158 | case TDA9840_STEREO_ADJUST: | |
a832781c | 159 | v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte); |
1da177e4 LT |
160 | |
161 | /* check for correct range */ | |
162 | if (byte > 25 || byte < -24) | |
163 | return -EINVAL; | |
164 | ||
165 | /* calculate actual value to set */ | |
166 | byte /= 5; | |
167 | if (0 < byte) | |
168 | byte += 0x20; | |
169 | else | |
170 | byte = -byte; | |
171 | ||
a832781c | 172 | tda9840_write(client, STEREO_ADJUST, byte); |
1da177e4 | 173 | break; |
1da177e4 LT |
174 | default: |
175 | return -ENOIOCTLCMD; | |
176 | } | |
177 | ||
1da177e4 LT |
178 | return 0; |
179 | } | |
180 | ||
a832781c HV |
181 | static int tda9840_probe(struct i2c_client *client, |
182 | const struct i2c_device_id *id) | |
1da177e4 | 183 | { |
a832781c HV |
184 | int result; |
185 | int byte; | |
1da177e4 LT |
186 | |
187 | /* let's see whether this adapter can support what we need */ | |
a832781c HV |
188 | if (!i2c_check_functionality(client->adapter, |
189 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
190 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) | |
1da177e4 | 191 | return 0; |
1da177e4 | 192 | |
a832781c HV |
193 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
194 | client->addr << 1, client->adapter->name); | |
1da177e4 LT |
195 | |
196 | /* set initial values for level & stereo - adjustment, mode */ | |
197 | byte = 0; | |
a832781c HV |
198 | result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte); |
199 | result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte); | |
707ecf46 | 200 | tda9840_write(client, SWITCH, TDA9840_SET_STEREO); |
1da177e4 | 201 | if (result) { |
a832781c | 202 | v4l_dbg(1, debug, client, "could not initialize tda9840\n"); |
1da177e4 LT |
203 | return -ENODEV; |
204 | } | |
1da177e4 LT |
205 | return 0; |
206 | } | |
207 | ||
a832781c | 208 | static int tda9840_legacy_probe(struct i2c_adapter *adapter) |
1da177e4 | 209 | { |
a832781c HV |
210 | /* Let's see whether this is a known adapter we can attach to. |
211 | Prevents conflicts with tvaudio.c. */ | |
212 | return adapter->id == I2C_HW_SAA7146; | |
1da177e4 | 213 | } |
a832781c HV |
214 | static const struct i2c_device_id tda9840_id[] = { |
215 | { "tda9840", 0 }, | |
216 | { } | |
1da177e4 | 217 | }; |
a832781c | 218 | MODULE_DEVICE_TABLE(i2c, tda9840_id); |
1da177e4 | 219 | |
a832781c | 220 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
fae91e72 | 221 | .name = "tda9840", |
a832781c HV |
222 | .driverid = I2C_DRIVERID_TDA9840, |
223 | .command = tda9840_command, | |
224 | .probe = tda9840_probe, | |
225 | .legacy_probe = tda9840_legacy_probe, | |
226 | .id_table = tda9840_id, | |
1da177e4 | 227 | }; |