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> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 | 32 | #include <linux/i2c.h> |
973909e8 | 33 | #include <media/v4l2-device.h> |
1da177e4 | 34 | |
a832781c HV |
35 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
36 | MODULE_DESCRIPTION("tda9840 driver"); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
39 | static int debug; | |
1da177e4 | 40 | module_param(debug, int, 0644); |
f87086e3 | 41 | |
a832781c | 42 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
1da177e4 LT |
43 | |
44 | #define SWITCH 0x00 | |
45 | #define LEVEL_ADJUST 0x02 | |
46 | #define STEREO_ADJUST 0x03 | |
47 | #define TEST 0x04 | |
48 | ||
707ecf46 HV |
49 | #define TDA9840_SET_MUTE 0x00 |
50 | #define TDA9840_SET_MONO 0x10 | |
51 | #define TDA9840_SET_STEREO 0x2a | |
52 | #define TDA9840_SET_LANG1 0x12 | |
53 | #define TDA9840_SET_LANG2 0x1e | |
54 | #define TDA9840_SET_BOTH 0x1a | |
55 | #define TDA9840_SET_BOTH_R 0x16 | |
56 | #define TDA9840_SET_EXTERNAL 0x7a | |
57 | ||
1da177e4 | 58 | |
973909e8 | 59 | static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) |
a832781c | 60 | { |
973909e8 HV |
61 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
62 | ||
a832781c | 63 | if (i2c_smbus_write_byte_data(client, reg, val)) |
973909e8 | 64 | v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n", |
a832781c HV |
65 | val, reg); |
66 | } | |
1da177e4 | 67 | |
8bb5bafa HV |
68 | static int tda9840_status(struct v4l2_subdev *sd) |
69 | { | |
70 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
71 | u8 byte; | |
72 | ||
73 | if (1 != i2c_master_recv(client, &byte, 1)) { | |
74 | v4l2_dbg(1, debug, sd, | |
75 | "i2c_master_recv() failed\n"); | |
76 | return -EIO; | |
77 | } | |
78 | ||
79 | if (byte & 0x80) { | |
80 | v4l2_dbg(1, debug, sd, | |
81 | "TDA9840_DETECT: register contents invalid\n"); | |
82 | return -EINVAL; | |
83 | } | |
84 | ||
85 | v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); | |
86 | return byte & 0x60; | |
87 | } | |
88 | ||
2f73c7c5 | 89 | static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t) |
1da177e4 | 90 | { |
8bb5bafa | 91 | int stat = tda9840_status(sd); |
973909e8 | 92 | int byte; |
707ecf46 | 93 | |
973909e8 HV |
94 | if (t->index) |
95 | return -EINVAL; | |
707ecf46 | 96 | |
8bb5bafa HV |
97 | stat = stat < 0 ? 0 : stat; |
98 | if (stat == 0 || stat == 0x60) /* mono input */ | |
973909e8 | 99 | byte = TDA9840_SET_MONO; |
8bb5bafa HV |
100 | else if (stat == 0x40) /* stereo input */ |
101 | byte = (t->audmode == V4L2_TUNER_MODE_MONO) ? | |
102 | TDA9840_SET_MONO : TDA9840_SET_STEREO; | |
103 | else { /* bilingual */ | |
104 | switch (t->audmode) { | |
105 | case V4L2_TUNER_MODE_LANG1_LANG2: | |
106 | byte = TDA9840_SET_BOTH; | |
107 | break; | |
108 | case V4L2_TUNER_MODE_LANG2: | |
109 | byte = TDA9840_SET_LANG2; | |
110 | break; | |
111 | default: | |
112 | byte = TDA9840_SET_LANG1; | |
113 | break; | |
114 | } | |
973909e8 HV |
115 | } |
116 | v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); | |
117 | tda9840_write(sd, SWITCH, byte); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) | |
122 | { | |
8bb5bafa | 123 | int stat = tda9840_status(sd); |
973909e8 | 124 | |
8bb5bafa HV |
125 | if (stat < 0) |
126 | return stat; | |
707ecf46 | 127 | |
8bb5bafa | 128 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
1da177e4 | 129 | |
8bb5bafa | 130 | switch (stat & 0x60) { |
973909e8 | 131 | case 0x00: |
707ecf46 | 132 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
973909e8 HV |
133 | break; |
134 | case 0x20: | |
135 | t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; | |
136 | break; | |
137 | case 0x40: | |
138 | t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; | |
139 | break; | |
140 | default: /* Incorrect detect */ | |
141 | t->rxsubchans = V4L2_TUNER_MODE_MONO; | |
1da177e4 | 142 | break; |
707ecf46 | 143 | } |
973909e8 HV |
144 | return 0; |
145 | } | |
1da177e4 | 146 | |
973909e8 HV |
147 | /* ----------------------------------------------------------------------- */ |
148 | ||
973909e8 HV |
149 | static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { |
150 | .s_tuner = tda9840_s_tuner, | |
151 | .g_tuner = tda9840_g_tuner, | |
152 | }; | |
153 | ||
154 | static const struct v4l2_subdev_ops tda9840_ops = { | |
973909e8 HV |
155 | .tuner = &tda9840_tuner_ops, |
156 | }; | |
157 | ||
158 | /* ----------------------------------------------------------------------- */ | |
159 | ||
a832781c HV |
160 | static int tda9840_probe(struct i2c_client *client, |
161 | const struct i2c_device_id *id) | |
1da177e4 | 162 | { |
973909e8 | 163 | struct v4l2_subdev *sd; |
1da177e4 LT |
164 | |
165 | /* let's see whether this adapter can support what we need */ | |
a832781c HV |
166 | if (!i2c_check_functionality(client->adapter, |
167 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
168 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) | |
973909e8 | 169 | return -EIO; |
1da177e4 | 170 | |
a832781c HV |
171 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
172 | client->addr << 1, client->adapter->name); | |
1da177e4 | 173 | |
c02b211d | 174 | sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); |
973909e8 HV |
175 | if (sd == NULL) |
176 | return -ENOMEM; | |
177 | v4l2_i2c_subdev_init(sd, client, &tda9840_ops); | |
178 | ||
1da177e4 | 179 | /* set initial values for level & stereo - adjustment, mode */ |
1b8dac15 HV |
180 | tda9840_write(sd, LEVEL_ADJUST, 0); |
181 | tda9840_write(sd, STEREO_ADJUST, 0); | |
973909e8 | 182 | tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); |
1da177e4 LT |
183 | return 0; |
184 | } | |
185 | ||
973909e8 HV |
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); | |
973909e8 HV |
191 | return 0; |
192 | } | |
193 | ||
a832781c HV |
194 | static const struct i2c_device_id tda9840_id[] = { |
195 | { "tda9840", 0 }, | |
196 | { } | |
1da177e4 | 197 | }; |
a832781c | 198 | MODULE_DEVICE_TABLE(i2c, tda9840_id); |
1da177e4 | 199 | |
cb595b51 HV |
200 | static struct i2c_driver tda9840_driver = { |
201 | .driver = { | |
202 | .owner = THIS_MODULE, | |
203 | .name = "tda9840", | |
204 | }, | |
205 | .probe = tda9840_probe, | |
206 | .remove = tda9840_remove, | |
207 | .id_table = tda9840_id, | |
1da177e4 | 208 | }; |
cb595b51 | 209 | |
c6e8d86f | 210 | module_i2c_driver(tda9840_driver); |