77bfd24ecfae4fa0039dbb4f47472b898d9d7f41
[linux-2.6.git] / drivers / media / video / tda9840.c
1  /*
2     tda9840 - i2c-driver for the tda9840 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 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
28
29 #include <linux/module.h>
30 #include <linux/ioctl.h>
31 #include <linux/i2c.h>
32 #include <media/v4l2-common.h>
33 #include <media/v4l2-i2c-drv-legacy.h>
34 #include "tda9840.h"
35
36 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
37 MODULE_DESCRIPTION("tda9840 driver");
38 MODULE_LICENSE("GPL");
39
40 static int debug;
41 module_param(debug, int, 0644);
42
43 MODULE_PARM_DESC(debug, "Debug level (0-1)");
44
45 #define SWITCH          0x00
46 #define LEVEL_ADJUST    0x02
47 #define STEREO_ADJUST   0x03
48 #define TEST            0x04
49
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
59 /* addresses to scan, found only at 0x42 (7-Bit) */
60 static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END };
61
62 /* magic definition of all other variables and things */
63 I2C_CLIENT_INSMOD;
64
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 }
71
72 static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg)
73 {
74         int result = 0;
75         int byte = *(int *)arg;
76
77         switch (cmd) {
78         case VIDIOC_S_TUNER: {
79                 struct v4l2_tuner *t = arg;
80                 int byte;
81
82                 if (t->index)
83                         return -EINVAL;
84
85                 switch (t->audmode) {
86                 case V4L2_TUNER_MODE_STEREO:
87                         byte = TDA9840_SET_STEREO;
88                         break;
89                 case V4L2_TUNER_MODE_LANG1_LANG2:
90                         byte = TDA9840_SET_BOTH;
91                         break;
92                 case V4L2_TUNER_MODE_LANG1:
93                         byte = TDA9840_SET_LANG1;
94                         break;
95                 case V4L2_TUNER_MODE_LANG2:
96                         byte = TDA9840_SET_LANG2;
97                         break;
98                 default:
99                         byte = TDA9840_SET_MONO;
100                         break;
101                 }
102                 v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte);
103                 tda9840_write(client, SWITCH, byte);
104                 break;
105         }
106
107         case VIDIOC_G_TUNER: {
108                 struct v4l2_tuner *t = arg;
109                 u8 byte;
110
111                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
112                 if (1 != i2c_master_recv(client, &byte, 1)) {
113                         v4l_dbg(1, debug, client,
114                                 "i2c_master_recv() failed\n");
115                         return -EIO;
116                 }
117
118                 if (byte & 0x80) {
119                         v4l_dbg(1, debug, client,
120                                 "TDA9840_DETECT: register contents invalid\n");
121                         return -EINVAL;
122                 }
123
124                 v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte);
125
126                 switch (byte & 0x60) {
127                 case 0x00:
128                         t->rxsubchans = V4L2_TUNER_SUB_MONO;
129                         break;
130                 case 0x20:
131                         t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
132                         break;
133                 case 0x40:
134                         t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
135                         break;
136                 default: /* Incorrect detect */
137                         t->rxsubchans = V4L2_TUNER_MODE_MONO;
138                         break;
139                 }
140                 break;
141         }
142
143         case TDA9840_LEVEL_ADJUST:
144                 v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte);
145
146                 /* check for correct range */
147                 if (byte > 25 || byte < -20)
148                         return -EINVAL;
149
150                 /* calculate actual value to set, see specs, page 18 */
151                 byte /= 5;
152                 if (0 < byte)
153                         byte += 0x8;
154                 else
155                         byte = -byte;
156                 tda9840_write(client, LEVEL_ADJUST, byte);
157                 break;
158
159         case TDA9840_STEREO_ADJUST:
160                 v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte);
161
162                 /* check for correct range */
163                 if (byte > 25 || byte < -24)
164                         return -EINVAL;
165
166                 /* calculate actual value to set */
167                 byte /= 5;
168                 if (0 < byte)
169                         byte += 0x20;
170                 else
171                         byte = -byte;
172
173                 tda9840_write(client, STEREO_ADJUST, byte);
174                 break;
175         default:
176                 return -ENOIOCTLCMD;
177         }
178
179         if (result)
180                 return -EIO;
181
182         return 0;
183 }
184
185 static int tda9840_probe(struct i2c_client *client,
186                           const struct i2c_device_id *id)
187 {
188         int result;
189         int byte;
190
191         /* let's see whether this adapter can support what we need */
192         if (!i2c_check_functionality(client->adapter,
193                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
194                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
195                 return 0;
196
197         v4l_info(client, "chip found @ 0x%x (%s)\n",
198                         client->addr << 1, client->adapter->name);
199
200         /* set initial values for level & stereo - adjustment, mode */
201         byte = 0;
202         result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte);
203         result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte);
204         tda9840_write(client, SWITCH, TDA9840_SET_STEREO);
205         if (result) {
206                 v4l_dbg(1, debug, client, "could not initialize tda9840\n");
207                 return -ENODEV;
208         }
209         return 0;
210 }
211
212 static int tda9840_legacy_probe(struct i2c_adapter *adapter)
213 {
214         /* Let's see whether this is a known adapter we can attach to.
215            Prevents conflicts with tvaudio.c. */
216         return adapter->id == I2C_HW_SAA7146;
217 }
218 static const struct i2c_device_id tda9840_id[] = {
219         { "tda9840", 0 },
220         { }
221 };
222 MODULE_DEVICE_TABLE(i2c, tda9840_id);
223
224 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
225         .name = "tda9840",
226         .driverid = I2C_DRIVERID_TDA9840,
227         .command = tda9840_command,
228         .probe = tda9840_probe,
229         .legacy_probe = tda9840_legacy_probe,
230         .id_table = tda9840_id,
231 };