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/slab.h>
32 #include <linux/i2c.h>
33 #include <media/v4l2-device.h>
34 #include <media/v4l2-chip-ident.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
tda9840_write(struct v4l2_subdev * sd,u8 reg,u8 val)60 static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
61 {
62 struct i2c_client *client = v4l2_get_subdevdata(sd);
63
64 if (i2c_smbus_write_byte_data(client, reg, val))
65 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
66 val, reg);
67 }
68
tda9840_s_tuner(struct v4l2_subdev * sd,struct v4l2_tuner * t)69 static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
70 {
71 int byte;
72
73 if (t->index)
74 return -EINVAL;
75
76 switch (t->audmode) {
77 case V4L2_TUNER_MODE_STEREO:
78 byte = TDA9840_SET_STEREO;
79 break;
80 case V4L2_TUNER_MODE_LANG1_LANG2:
81 byte = TDA9840_SET_BOTH;
82 break;
83 case V4L2_TUNER_MODE_LANG1:
84 byte = TDA9840_SET_LANG1;
85 break;
86 case V4L2_TUNER_MODE_LANG2:
87 byte = TDA9840_SET_LANG2;
88 break;
89 default:
90 byte = TDA9840_SET_MONO;
91 break;
92 }
93 v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
94 tda9840_write(sd, SWITCH, byte);
95 return 0;
96 }
97
tda9840_g_tuner(struct v4l2_subdev * sd,struct v4l2_tuner * t)98 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
99 {
100 struct i2c_client *client = v4l2_get_subdevdata(sd);
101 u8 byte;
102
103 t->rxsubchans = V4L2_TUNER_SUB_MONO;
104 if (1 != i2c_master_recv(client, &byte, 1)) {
105 v4l2_dbg(1, debug, sd,
106 "i2c_master_recv() failed\n");
107 return -EIO;
108 }
109
110 if (byte & 0x80) {
111 v4l2_dbg(1, debug, sd,
112 "TDA9840_DETECT: register contents invalid\n");
113 return -EINVAL;
114 }
115
116 v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
117
118 switch (byte & 0x60) {
119 case 0x00:
120 t->rxsubchans = V4L2_TUNER_SUB_MONO;
121 break;
122 case 0x20:
123 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
124 break;
125 case 0x40:
126 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
127 break;
128 default: /* Incorrect detect */
129 t->rxsubchans = V4L2_TUNER_MODE_MONO;
130 break;
131 }
132 return 0;
133 }
134
tda9840_g_chip_ident(struct v4l2_subdev * sd,struct v4l2_dbg_chip_ident * chip)135 static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
136 {
137 struct i2c_client *client = v4l2_get_subdevdata(sd);
138
139 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
140 }
141
142 /* ----------------------------------------------------------------------- */
143
144 static const struct v4l2_subdev_core_ops tda9840_core_ops = {
145 .g_chip_ident = tda9840_g_chip_ident,
146 };
147
148 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
149 .s_tuner = tda9840_s_tuner,
150 .g_tuner = tda9840_g_tuner,
151 };
152
153 static const struct v4l2_subdev_ops tda9840_ops = {
154 .core = &tda9840_core_ops,
155 .tuner = &tda9840_tuner_ops,
156 };
157
158 /* ----------------------------------------------------------------------- */
159
tda9840_probe(struct i2c_client * client,const struct i2c_device_id * id)160 static int tda9840_probe(struct i2c_client *client,
161 const struct i2c_device_id *id)
162 {
163 struct v4l2_subdev *sd;
164
165 /* let's see whether this adapter can support what we need */
166 if (!i2c_check_functionality(client->adapter,
167 I2C_FUNC_SMBUS_READ_BYTE_DATA |
168 I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
169 return -EIO;
170
171 v4l_info(client, "chip found @ 0x%x (%s)\n",
172 client->addr << 1, client->adapter->name);
173
174 sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
175 if (sd == NULL)
176 return -ENOMEM;
177 v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
178
179 /* set initial values for level & stereo - adjustment, mode */
180 tda9840_write(sd, LEVEL_ADJUST, 0);
181 tda9840_write(sd, STEREO_ADJUST, 0);
182 tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
183 return 0;
184 }
185
tda9840_remove(struct i2c_client * client)186 static int tda9840_remove(struct i2c_client *client)
187 {
188 struct v4l2_subdev *sd = i2c_get_clientdata(client);
189
190 v4l2_device_unregister_subdev(sd);
191 kfree(sd);
192 return 0;
193 }
194
195 static const struct i2c_device_id tda9840_id[] = {
196 { "tda9840", 0 },
197 { }
198 };
199 MODULE_DEVICE_TABLE(i2c, tda9840_id);
200
201 static struct i2c_driver tda9840_driver = {
202 .driver = {
203 .owner = THIS_MODULE,
204 .name = "tda9840",
205 },
206 .probe = tda9840_probe,
207 .remove = tda9840_remove,
208 .id_table = tda9840_id,
209 };
210
211 module_i2c_driver(tda9840_driver);
212