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> | |
31 | #include <linux/i2c.h> | |
973909e8 | 32 | #include <media/v4l2-device.h> |
a832781c | 33 | #include <media/v4l2-i2c-drv-legacy.h> |
1da177e4 LT |
34 | #include "tda9840.h" |
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 | /* addresses to scan, found only at 0x42 (7-Bit) */ |
09df1c16 | 60 | static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END }; |
1da177e4 LT |
61 | |
62 | /* magic definition of all other variables and things */ | |
63 | I2C_CLIENT_INSMOD; | |
64 | ||
973909e8 | 65 | static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) |
a832781c | 66 | { |
973909e8 HV |
67 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
68 | ||
a832781c | 69 | if (i2c_smbus_write_byte_data(client, reg, val)) |
973909e8 | 70 | v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n", |
a832781c HV |
71 | val, reg); |
72 | } | |
1da177e4 | 73 | |
973909e8 | 74 | static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) |
1da177e4 | 75 | { |
973909e8 | 76 | int byte; |
707ecf46 | 77 | |
973909e8 HV |
78 | if (t->index) |
79 | return -EINVAL; | |
707ecf46 | 80 | |
973909e8 HV |
81 | switch (t->audmode) { |
82 | case V4L2_TUNER_MODE_STEREO: | |
83 | byte = TDA9840_SET_STEREO; | |
707ecf46 | 84 | break; |
973909e8 HV |
85 | case V4L2_TUNER_MODE_LANG1_LANG2: |
86 | byte = TDA9840_SET_BOTH; | |
87 | break; | |
88 | case V4L2_TUNER_MODE_LANG1: | |
89 | byte = TDA9840_SET_LANG1; | |
90 | break; | |
91 | case V4L2_TUNER_MODE_LANG2: | |
92 | byte = TDA9840_SET_LANG2; | |
93 | break; | |
94 | default: | |
95 | byte = TDA9840_SET_MONO; | |
96 | break; | |
97 | } | |
98 | v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); | |
99 | tda9840_write(sd, SWITCH, byte); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) | |
104 | { | |
105 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
106 | u8 byte; | |
107 | ||
108 | t->rxsubchans = V4L2_TUNER_SUB_MONO; | |
109 | if (1 != i2c_master_recv(client, &byte, 1)) { | |
110 | v4l2_dbg(1, debug, sd, | |
111 | "i2c_master_recv() failed\n"); | |
112 | return -EIO; | |
113 | } | |
114 | ||
115 | if (byte & 0x80) { | |
116 | v4l2_dbg(1, debug, sd, | |
117 | "TDA9840_DETECT: register contents invalid\n"); | |
118 | return -EINVAL; | |
707ecf46 HV |
119 | } |
120 | ||
973909e8 | 121 | v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); |
1da177e4 | 122 | |
973909e8 HV |
123 | switch (byte & 0x60) { |
124 | case 0x00: | |
707ecf46 | 125 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
973909e8 HV |
126 | break; |
127 | case 0x20: | |
128 | t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; | |
129 | break; | |
130 | case 0x40: | |
131 | t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; | |
132 | break; | |
133 | default: /* Incorrect detect */ | |
134 | t->rxsubchans = V4L2_TUNER_MODE_MONO; | |
1da177e4 | 135 | break; |
707ecf46 | 136 | } |
973909e8 HV |
137 | return 0; |
138 | } | |
1da177e4 | 139 | |
069b7479 | 140 | static long tda9840_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg) |
973909e8 HV |
141 | { |
142 | int byte; | |
143 | ||
144 | switch (cmd) { | |
1da177e4 | 145 | case TDA9840_LEVEL_ADJUST: |
973909e8 HV |
146 | byte = *(int *)arg; |
147 | v4l2_dbg(1, debug, sd, "TDA9840_LEVEL_ADJUST: %d\n", byte); | |
1da177e4 LT |
148 | |
149 | /* check for correct range */ | |
150 | if (byte > 25 || byte < -20) | |
151 | return -EINVAL; | |
152 | ||
153 | /* calculate actual value to set, see specs, page 18 */ | |
154 | byte /= 5; | |
155 | if (0 < byte) | |
156 | byte += 0x8; | |
157 | else | |
158 | byte = -byte; | |
973909e8 | 159 | tda9840_write(sd, LEVEL_ADJUST, byte); |
1da177e4 LT |
160 | break; |
161 | ||
162 | case TDA9840_STEREO_ADJUST: | |
973909e8 HV |
163 | byte = *(int *)arg; |
164 | v4l2_dbg(1, debug, sd, "TDA9840_STEREO_ADJUST: %d\n", byte); | |
1da177e4 LT |
165 | |
166 | /* check for correct range */ | |
167 | if (byte > 25 || byte < -24) | |
168 | return -EINVAL; | |
169 | ||
170 | /* calculate actual value to set */ | |
171 | byte /= 5; | |
172 | if (0 < byte) | |
173 | byte += 0x20; | |
174 | else | |
175 | byte = -byte; | |
176 | ||
973909e8 | 177 | tda9840_write(sd, STEREO_ADJUST, byte); |
1da177e4 | 178 | break; |
1da177e4 LT |
179 | default: |
180 | return -ENOIOCTLCMD; | |
181 | } | |
1da177e4 LT |
182 | return 0; |
183 | } | |
184 | ||
973909e8 HV |
185 | static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg) |
186 | { | |
187 | return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg); | |
188 | } | |
189 | ||
190 | /* ----------------------------------------------------------------------- */ | |
191 | ||
192 | static const struct v4l2_subdev_core_ops tda9840_core_ops = { | |
193 | .ioctl = tda9840_ioctl, | |
194 | }; | |
195 | ||
196 | static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { | |
197 | .s_tuner = tda9840_s_tuner, | |
198 | .g_tuner = tda9840_g_tuner, | |
199 | }; | |
200 | ||
201 | static const struct v4l2_subdev_ops tda9840_ops = { | |
202 | .core = &tda9840_core_ops, | |
203 | .tuner = &tda9840_tuner_ops, | |
204 | }; | |
205 | ||
206 | /* ----------------------------------------------------------------------- */ | |
207 | ||
a832781c HV |
208 | static int tda9840_probe(struct i2c_client *client, |
209 | const struct i2c_device_id *id) | |
1da177e4 | 210 | { |
973909e8 | 211 | struct v4l2_subdev *sd; |
a832781c HV |
212 | int result; |
213 | int byte; | |
1da177e4 LT |
214 | |
215 | /* let's see whether this adapter can support what we need */ | |
a832781c HV |
216 | if (!i2c_check_functionality(client->adapter, |
217 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
218 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) | |
973909e8 | 219 | return -EIO; |
1da177e4 | 220 | |
a832781c HV |
221 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
222 | client->addr << 1, client->adapter->name); | |
1da177e4 | 223 | |
973909e8 HV |
224 | sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); |
225 | if (sd == NULL) | |
226 | return -ENOMEM; | |
227 | v4l2_i2c_subdev_init(sd, client, &tda9840_ops); | |
228 | ||
1da177e4 LT |
229 | /* set initial values for level & stereo - adjustment, mode */ |
230 | byte = 0; | |
973909e8 HV |
231 | result = tda9840_ioctl(sd, TDA9840_LEVEL_ADJUST, &byte); |
232 | result |= tda9840_ioctl(sd, TDA9840_STEREO_ADJUST, &byte); | |
233 | tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); | |
1da177e4 | 234 | if (result) { |
973909e8 HV |
235 | v4l2_dbg(1, debug, sd, "could not initialize tda9840\n"); |
236 | kfree(sd); | |
1da177e4 LT |
237 | return -ENODEV; |
238 | } | |
1da177e4 LT |
239 | return 0; |
240 | } | |
241 | ||
973909e8 HV |
242 | static int tda9840_remove(struct i2c_client *client) |
243 | { | |
244 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
245 | ||
246 | v4l2_device_unregister_subdev(sd); | |
247 | kfree(sd); | |
248 | return 0; | |
249 | } | |
250 | ||
a832781c | 251 | static int tda9840_legacy_probe(struct i2c_adapter *adapter) |
1da177e4 | 252 | { |
a832781c HV |
253 | /* Let's see whether this is a known adapter we can attach to. |
254 | Prevents conflicts with tvaudio.c. */ | |
255 | return adapter->id == I2C_HW_SAA7146; | |
1da177e4 | 256 | } |
a832781c HV |
257 | static const struct i2c_device_id tda9840_id[] = { |
258 | { "tda9840", 0 }, | |
259 | { } | |
1da177e4 | 260 | }; |
a832781c | 261 | MODULE_DEVICE_TABLE(i2c, tda9840_id); |
1da177e4 | 262 | |
a832781c | 263 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
fae91e72 | 264 | .name = "tda9840", |
a832781c HV |
265 | .driverid = I2C_DRIVERID_TDA9840, |
266 | .command = tda9840_command, | |
267 | .probe = tda9840_probe, | |
973909e8 | 268 | .remove = tda9840_remove, |
a832781c HV |
269 | .legacy_probe = tda9840_legacy_probe, |
270 | .id_table = tda9840_id, | |
1da177e4 | 271 | }; |