2 tda9840 - i2c-driver for the tda9840 by SGS Thomson
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
5 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
7 The tda9840 is a stereo/dual sound processor with digital
8 identification. It can be found at address 0x84 on the i2c-bus.
10 For detailed informations download the specifications directly
11 from SGS Thomson at http://www.st.com
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.
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.
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.
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>
36 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
37 MODULE_DESCRIPTION("tda9840 driver");
38 MODULE_LICENSE("GPL");
41 module_param(debug
, int, 0644);
43 MODULE_PARM_DESC(debug
, "Debug level (0-1)");
46 #define LEVEL_ADJUST 0x02
47 #define STEREO_ADJUST 0x03
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
59 /* addresses to scan, found only at 0x42 (7-Bit) */
60 static unsigned short normal_i2c
[] = { I2C_ADDR_TDA9840
, I2C_CLIENT_END
};
62 /* magic definition of all other variables and things */
65 static void tda9840_write(struct i2c_client
*client
, u8 reg
, u8 val
)
67 if (i2c_smbus_write_byte_data(client
, reg
, val
))
68 v4l_dbg(1, debug
, client
, "error writing %02x to %02x\n",
72 static int tda9840_command(struct i2c_client
*client
, unsigned cmd
, void *arg
)
74 int byte
= *(int *)arg
;
77 case VIDIOC_S_TUNER
: {
78 struct v4l2_tuner
*t
= arg
;
85 case V4L2_TUNER_MODE_STEREO
:
86 byte
= TDA9840_SET_STEREO
;
88 case V4L2_TUNER_MODE_LANG1_LANG2
:
89 byte
= TDA9840_SET_BOTH
;
91 case V4L2_TUNER_MODE_LANG1
:
92 byte
= TDA9840_SET_LANG1
;
94 case V4L2_TUNER_MODE_LANG2
:
95 byte
= TDA9840_SET_LANG2
;
98 byte
= TDA9840_SET_MONO
;
101 v4l_dbg(1, debug
, client
, "TDA9840_SWITCH: 0x%02x\n", byte
);
102 tda9840_write(client
, SWITCH
, byte
);
106 case VIDIOC_G_TUNER
: {
107 struct v4l2_tuner
*t
= arg
;
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");
118 v4l_dbg(1, debug
, client
,
119 "TDA9840_DETECT: register contents invalid\n");
123 v4l_dbg(1, debug
, client
, "TDA9840_DETECT: byte: 0x%02x\n", byte
);
125 switch (byte
& 0x60) {
127 t
->rxsubchans
= V4L2_TUNER_SUB_MONO
;
130 t
->rxsubchans
= V4L2_TUNER_SUB_LANG1
| V4L2_TUNER_SUB_LANG2
;
133 t
->rxsubchans
= V4L2_TUNER_SUB_STEREO
| V4L2_TUNER_SUB_MONO
;
135 default: /* Incorrect detect */
136 t
->rxsubchans
= V4L2_TUNER_MODE_MONO
;
142 case TDA9840_LEVEL_ADJUST
:
143 v4l_dbg(1, debug
, client
, "TDA9840_LEVEL_ADJUST: %d\n", byte
);
145 /* check for correct range */
146 if (byte
> 25 || byte
< -20)
149 /* calculate actual value to set, see specs, page 18 */
155 tda9840_write(client
, LEVEL_ADJUST
, byte
);
158 case TDA9840_STEREO_ADJUST
:
159 v4l_dbg(1, debug
, client
, "TDA9840_STEREO_ADJUST: %d\n", byte
);
161 /* check for correct range */
162 if (byte
> 25 || byte
< -24)
165 /* calculate actual value to set */
172 tda9840_write(client
, STEREO_ADJUST
, byte
);
181 static int tda9840_probe(struct i2c_client
*client
,
182 const struct i2c_device_id
*id
)
187 /* let's see whether this adapter can support what we need */
188 if (!i2c_check_functionality(client
->adapter
,
189 I2C_FUNC_SMBUS_READ_BYTE_DATA
|
190 I2C_FUNC_SMBUS_WRITE_BYTE_DATA
))
193 v4l_info(client
, "chip found @ 0x%x (%s)\n",
194 client
->addr
<< 1, client
->adapter
->name
);
196 /* set initial values for level & stereo - adjustment, mode */
198 result
= tda9840_command(client
, TDA9840_LEVEL_ADJUST
, &byte
);
199 result
+= tda9840_command(client
, TDA9840_STEREO_ADJUST
, &byte
);
200 tda9840_write(client
, SWITCH
, TDA9840_SET_STEREO
);
202 v4l_dbg(1, debug
, client
, "could not initialize tda9840\n");
208 static int tda9840_legacy_probe(struct i2c_adapter
*adapter
)
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
;
214 static const struct i2c_device_id tda9840_id
[] = {
218 MODULE_DEVICE_TABLE(i2c
, tda9840_id
);
220 static struct v4l2_i2c_driver_data v4l2_i2c_data
= {
222 .driverid
= I2C_DRIVERID_TDA9840
,
223 .command
= tda9840_command
,
224 .probe
= tda9840_probe
,
225 .legacy_probe
= tda9840_legacy_probe
,
226 .id_table
= tda9840_id
,