Commit | Line | Data |
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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> |
1b8dac15 | 34 | #include <media/v4l2-chip-ident.h> |
1da177e4 | 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 | |
973909e8 | 60 | static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) |
a832781c | 61 | { |
973909e8 HV |
62 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
63 | ||
a832781c | 64 | if (i2c_smbus_write_byte_data(client, reg, val)) |
973909e8 | 65 | v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n", |
a832781c HV |
66 | val, reg); |
67 | } | |
1da177e4 | 68 | |
8bb5bafa HV |
69 | static int tda9840_status(struct v4l2_subdev *sd) |
70 | { | |
71 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
72 | u8 byte; | |
73 | ||
74 | if (1 != i2c_master_recv(client, &byte, 1)) { | |
75 | v4l2_dbg(1, debug, sd, | |
76 | "i2c_master_recv() failed\n"); | |
77 | return -EIO; | |
78 | } | |
79 | ||
80 | if (byte & 0x80) { | |
81 | v4l2_dbg(1, debug, sd, | |
82 | "TDA9840_DETECT: register contents invalid\n"); | |
83 | return -EINVAL; | |
84 | } | |
85 | ||
86 | v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); | |
87 | return byte & 0x60; | |
88 | } | |
89 | ||
973909e8 | 90 | static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) |
1da177e4 | 91 | { |
8bb5bafa | 92 | int stat = tda9840_status(sd); |
973909e8 | 93 | int byte; |
707ecf46 | 94 | |
973909e8 HV |
95 | if (t->index) |
96 | return -EINVAL; | |
707ecf46 | 97 | |
8bb5bafa HV |
98 | stat = stat < 0 ? 0 : stat; |
99 | if (stat == 0 || stat == 0x60) /* mono input */ | |
973909e8 | 100 | byte = TDA9840_SET_MONO; |
8bb5bafa HV |
101 | else if (stat == 0x40) /* stereo input */ |
102 | byte = (t->audmode == V4L2_TUNER_MODE_MONO) ? | |
103 | TDA9840_SET_MONO : TDA9840_SET_STEREO; | |
104 | else { /* bilingual */ | |
105 | switch (t->audmode) { | |
106 | case V4L2_TUNER_MODE_LANG1_LANG2: | |
107 | byte = TDA9840_SET_BOTH; | |
108 | break; | |
109 | case V4L2_TUNER_MODE_LANG2: | |
110 | byte = TDA9840_SET_LANG2; | |
111 | break; | |
112 | default: | |
113 | byte = TDA9840_SET_LANG1; | |
114 | break; | |
115 | } | |
973909e8 HV |
116 | } |
117 | v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); | |
118 | tda9840_write(sd, SWITCH, byte); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) | |
123 | { | |
8bb5bafa | 124 | int stat = tda9840_status(sd); |
973909e8 | 125 | |
8bb5bafa HV |
126 | if (stat < 0) |
127 | return stat; | |
707ecf46 | 128 | |
8bb5bafa | 129 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
1da177e4 | 130 | |
8bb5bafa | 131 | switch (stat & 0x60) { |
973909e8 | 132 | case 0x00: |
707ecf46 | 133 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
973909e8 HV |
134 | break; |
135 | case 0x20: | |
136 | t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; | |
137 | break; | |
138 | case 0x40: | |
139 | t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; | |
140 | break; | |
141 | default: /* Incorrect detect */ | |
142 | t->rxsubchans = V4L2_TUNER_MODE_MONO; | |
1da177e4 | 143 | break; |
707ecf46 | 144 | } |
973909e8 HV |
145 | return 0; |
146 | } | |
1da177e4 | 147 | |
1b8dac15 | 148 | static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) |
973909e8 | 149 | { |
1b8dac15 | 150 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
1da177e4 | 151 | |
1b8dac15 | 152 | return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0); |
973909e8 HV |
153 | } |
154 | ||
155 | /* ----------------------------------------------------------------------- */ | |
156 | ||
157 | static const struct v4l2_subdev_core_ops tda9840_core_ops = { | |
1b8dac15 | 158 | .g_chip_ident = tda9840_g_chip_ident, |
973909e8 HV |
159 | }; |
160 | ||
161 | static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { | |
162 | .s_tuner = tda9840_s_tuner, | |
163 | .g_tuner = tda9840_g_tuner, | |
164 | }; | |
165 | ||
166 | static const struct v4l2_subdev_ops tda9840_ops = { | |
167 | .core = &tda9840_core_ops, | |
168 | .tuner = &tda9840_tuner_ops, | |
169 | }; | |
170 | ||
171 | /* ----------------------------------------------------------------------- */ | |
172 | ||
a832781c HV |
173 | static int tda9840_probe(struct i2c_client *client, |
174 | const struct i2c_device_id *id) | |
1da177e4 | 175 | { |
973909e8 | 176 | struct v4l2_subdev *sd; |
1da177e4 LT |
177 | |
178 | /* let's see whether this adapter can support what we need */ | |
a832781c HV |
179 | if (!i2c_check_functionality(client->adapter, |
180 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
181 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) | |
973909e8 | 182 | return -EIO; |
1da177e4 | 183 | |
a832781c HV |
184 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
185 | client->addr << 1, client->adapter->name); | |
1da177e4 | 186 | |
80845a33 | 187 | sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); |
973909e8 HV |
188 | if (sd == NULL) |
189 | return -ENOMEM; | |
190 | v4l2_i2c_subdev_init(sd, client, &tda9840_ops); | |
191 | ||
1da177e4 | 192 | /* set initial values for level & stereo - adjustment, mode */ |
1b8dac15 HV |
193 | tda9840_write(sd, LEVEL_ADJUST, 0); |
194 | tda9840_write(sd, STEREO_ADJUST, 0); | |
973909e8 | 195 | tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); |
1da177e4 LT |
196 | return 0; |
197 | } | |
198 | ||
973909e8 HV |
199 | static int tda9840_remove(struct i2c_client *client) |
200 | { | |
201 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
202 | ||
203 | v4l2_device_unregister_subdev(sd); | |
204 | kfree(sd); | |
205 | return 0; | |
206 | } | |
207 | ||
a832781c HV |
208 | static const struct i2c_device_id tda9840_id[] = { |
209 | { "tda9840", 0 }, | |
210 | { } | |
1da177e4 | 211 | }; |
a832781c | 212 | MODULE_DEVICE_TABLE(i2c, tda9840_id); |
1da177e4 | 213 | |
cb595b51 HV |
214 | static struct i2c_driver tda9840_driver = { |
215 | .driver = { | |
216 | .owner = THIS_MODULE, | |
217 | .name = "tda9840", | |
218 | }, | |
219 | .probe = tda9840_probe, | |
220 | .remove = tda9840_remove, | |
221 | .id_table = tda9840_id, | |
1da177e4 | 222 | }; |
cb595b51 | 223 | |
c6e8d86f | 224 | module_i2c_driver(tda9840_driver); |