2 * For the STS-Thompson TDA7432 audio processor chip
4 * Handles audio functions: volume, balance, tone, loudness
5 * This driver will not complain if used with any
6 * other i2c device with the same address.
8 * Muting and tone control by Jonathan Isom <jisom@ematic.com>
10 * Copyright (c) 2000 Eric Sandeen <eric_sandeen@bigfoot.com>
11 * Copyright (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
12 * This code is placed under the terms of the GNU General Public License
13 * Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
14 * Which was based on tda8425.c by Greg Alexander (c) 1998
17 * debug - set to 1 if you'd like to see debug messages
18 * set to 2 if you'd like to be inundated with debug messages
20 * loudness - set between 0 and 15 for varying degrees of loudness effect
22 * maxvol - set maximium volume to +20db (1), default is 0db(0)
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/delay.h>
31 #include <linux/errno.h>
32 #include <linux/slab.h>
33 #include <linux/videodev2.h>
34 #include <linux/i2c.h>
36 #include <media/v4l2-device.h>
37 #include <media/v4l2-ioctl.h>
38 #include <media/i2c-addr.h>
40 #ifndef VIDEO_AUDIO_BALANCE
41 # define VIDEO_AUDIO_BALANCE 32
44 MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
45 MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
46 MODULE_LICENSE("GPL");
49 static int loudness; /* disable loudness by default */
50 static int debug; /* insmod parameter */
51 module_param(debug, int, S_IRUGO | S_IWUSR);
52 MODULE_PARM_DESC(debug, "Set debugging level from 0 to 3. Default is off(0).");
53 module_param(loudness, int, S_IRUGO);
54 MODULE_PARM_DESC(loudness, "Turn loudness on(1) else off(0). Default is off(0).");
55 module_param(maxvol, int, S_IRUGO | S_IWUSR);
56 MODULE_PARM_DESC(maxvol, "Set maximium volume to +20dB(0) else +0dB(1). Default is +20dB(0).");
59 /* Structure of address and subaddresses for the tda7432 */
62 struct v4l2_subdev sd;
72 static inline struct tda7432 *to_state(struct v4l2_subdev *sd)
74 return container_of(sd, struct tda7432, sd);
77 /* The TDA7432 is made by STS-Thompson
79 * http://us.st.com/stonline/books/pdf/docs/4056.pdf
81 * TDA7432: I2C-bus controlled basic audio processor
83 * The TDA7432 controls basic audio functions like volume, balance,
84 * and tone control (including loudness). It also has four channel
85 * output (for front and rear). Since most vidcap cards probably
86 * don't have 4 channel output, this driver will set front & rear
87 * together (no independent control).
90 /* Subaddresses for TDA7432 */
92 #define TDA7432_IN 0x00 /* Input select */
93 #define TDA7432_VL 0x01 /* Volume */
94 #define TDA7432_TN 0x02 /* Bass, Treble (Tone) */
95 #define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */
96 #define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */
97 #define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */
98 #define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */
99 #define TDA7432_LD 0x07 /* Loudness */
102 /* Masks for bits in TDA7432 subaddresses */
104 /* Many of these not used - just for documentation */
106 /* Subaddress 0x00 - Input selection and bass control */
108 /* Bits 0,1,2 control input:
109 * 0x00 - Stereo input
111 * 0x03 - Mute (Using Attenuators Plays better with modules)
112 * Mono probably isn't used - I'm guessing only the stereo
113 * input is connected on most cards, so we'll set it to stereo.
115 * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
116 * Bit 4 controls bass range: 0/1 is extended/standard bass range
118 * Highest 3 bits not used
121 #define TDA7432_STEREO_IN 0
122 #define TDA7432_MONO_IN 2 /* Probably won't be used */
123 #define TDA7432_BASS_SYM 1 << 3
124 #define TDA7432_BASS_NORM 1 << 4
126 /* Subaddress 0x01 - Volume */
128 /* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
129 * Recommended maximum is +20 dB
136 * MSB (bit 7) controls loudness: 1/0 is loudness on/off
139 #define TDA7432_VOL_0DB 0x20
140 #define TDA7432_LD_ON 1 << 7
143 /* Subaddress 0x02 - Tone control */
145 /* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
146 * 0x0 is 14dB, 0x7 is 0dB
148 * Bit 3 controls treble attenuation/gain (sign)
150 * 0 = attenuation (-)
152 * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
153 * (This is only true for normal base range, set in 0x00)
154 * 0x0 << 4 is 14dB, 0x7 is 0dB
156 * Bit 7 controls bass attenuation/gain (sign)
158 * 0 << 7 = attenuation (-)
161 * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
164 #define TDA7432_TREBLE_0DB 0xf
165 #define TDA7432_TREBLE 7
166 #define TDA7432_TREBLE_GAIN 1 << 3
167 #define TDA7432_BASS_0DB 0xf
168 #define TDA7432_BASS 7 << 4
169 #define TDA7432_BASS_GAIN 1 << 7
172 /* Subaddress 0x03 - Left Front attenuation */
173 /* Subaddress 0x04 - Left Rear attenuation */
174 /* Subaddress 0x05 - Right Front attenuation */
175 /* Subaddress 0x06 - Right Rear attenuation */
177 /* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
183 * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
184 * We'll use the mute on the input, though (above)
188 #define TDA7432_ATTEN_0DB 0x00
189 #define TDA7432_MUTE 0x1 << 5
192 /* Subaddress 0x07 - Loudness Control */
194 /* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
195 * when bit 4 is NOT set
200 * If bit 4 is set, then there is a flat attenuation according to
201 * the lower 4 bits, as above.
210 static int tda7432_write(struct v4l2_subdev *sd, int subaddr, int val)
212 struct i2c_client *client = v4l2_get_subdevdata(sd);
213 unsigned char buffer[2];
215 v4l2_dbg(2, debug, sd, "In tda7432_write\n");
216 v4l2_dbg(1, debug, sd, "Writing %d 0x%x\n", subaddr, val);
219 if (2 != i2c_master_send(client, buffer, 2)) {
220 v4l2_err(sd, "I/O error, trying (write %d 0x%x)\n",
227 static int tda7432_set(struct v4l2_subdev *sd)
229 struct i2c_client *client = v4l2_get_subdevdata(sd);
230 struct tda7432 *t = to_state(sd);
231 unsigned char buf[16];
233 v4l2_dbg(1, debug, sd,
234 "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
235 t->input, t->volume, t->bass, t->treble, t->lf, t->lr,
236 t->rf, t->rr, t->loud);
247 if (10 != i2c_master_send(client, buf, 10)) {
248 v4l2_err(sd, "I/O error, trying tda7432_set\n");
255 static void do_tda7432_init(struct v4l2_subdev *sd)
257 struct tda7432 *t = to_state(sd);
259 v4l2_dbg(2, debug, sd, "In tda7432_init\n");
261 t->input = TDA7432_STEREO_IN | /* Main (stereo) input */
262 TDA7432_BASS_SYM | /* Symmetric bass cut */
263 TDA7432_BASS_NORM; /* Normal bass range */
264 t->volume = 0x3b ; /* -27dB Volume */
265 if (loudness) /* Turn loudness on? */
266 t->volume |= TDA7432_LD_ON;
268 t->treble = TDA7432_TREBLE_0DB; /* 0dB Treble */
269 t->bass = TDA7432_BASS_0DB; /* 0dB Bass */
270 t->lf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
271 t->lr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
272 t->rf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
273 t->rr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
274 t->loud = loudness; /* insmod parameter */
279 static int tda7432_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
281 struct tda7432 *t = to_state(sd);
284 case V4L2_CID_AUDIO_MUTE:
285 ctrl->value=t->muted;
287 case V4L2_CID_AUDIO_VOLUME:
288 if (!maxvol){ /* max +20db */
289 ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 630;
290 } else { /* max 0db */
291 ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 829;
294 case V4L2_CID_AUDIO_BALANCE:
296 if ( (t->lf) < (t->rf) )
297 /* right is attenuated, balance shifted left */
298 ctrl->value = (32768 - 1057*(t->rf));
300 /* left is attenuated, balance shifted right */
301 ctrl->value = (32768 + 1057*(t->lf));
304 case V4L2_CID_AUDIO_BASS:
306 /* Bass/treble 4 bits each */
309 bass = ~(bass - 0x8) & 0xf;
310 ctrl->value = (bass << 12)+(bass << 8)+(bass << 4)+(bass);
313 case V4L2_CID_AUDIO_TREBLE:
315 int treble=t->treble;
317 treble = ~(treble - 0x8) & 0xf;
318 ctrl->value = (treble << 12)+(treble << 8)+(treble << 4)+(treble);
325 static int tda7432_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
327 struct tda7432 *t = to_state(sd);
330 case V4L2_CID_AUDIO_MUTE:
331 t->muted=ctrl->value;
333 case V4L2_CID_AUDIO_VOLUME:
334 if(!maxvol){ /* max +20db */
335 t->volume = 0x6f - ((ctrl->value)/630);
336 } else { /* max 0db */
337 t->volume = 0x6f - ((ctrl->value)/829);
339 if (loudness) /* Turn on the loudness bit */
340 t->volume |= TDA7432_LD_ON;
342 tda7432_write(sd, TDA7432_VL, t->volume);
344 case V4L2_CID_AUDIO_BALANCE:
345 if (ctrl->value < 32768) {
346 /* shifted to left, attenuate right */
347 t->rr = (32768 - ctrl->value)/1057;
349 t->lr = TDA7432_ATTEN_0DB;
350 t->lf = TDA7432_ATTEN_0DB;
351 } else if(ctrl->value > 32769) {
352 /* shifted to right, attenuate left */
353 t->lf = (ctrl->value - 32768)/1057;
355 t->rr = TDA7432_ATTEN_0DB;
356 t->rf = TDA7432_ATTEN_0DB;
359 t->rr = TDA7432_ATTEN_0DB;
360 t->rf = TDA7432_ATTEN_0DB;
361 t->lf = TDA7432_ATTEN_0DB;
362 t->lr = TDA7432_ATTEN_0DB;
365 case V4L2_CID_AUDIO_BASS:
366 t->bass = ctrl->value >> 12;
368 t->bass = (~t->bass & 0xf) + 0x8 ;
370 tda7432_write(sd, TDA7432_TN, 0x10 | (t->bass << 4) | t->treble);
372 case V4L2_CID_AUDIO_TREBLE:
373 t->treble= ctrl->value >> 12;
375 t->treble = (~t->treble & 0xf) + 0x8 ;
377 tda7432_write(sd, TDA7432_TN, 0x10 | (t->bass << 4) | t->treble);
383 /* Used for both mute and balance changes */
386 /* Mute & update balance*/
387 tda7432_write(sd, TDA7432_LF, t->lf | TDA7432_MUTE);
388 tda7432_write(sd, TDA7432_LR, t->lr | TDA7432_MUTE);
389 tda7432_write(sd, TDA7432_RF, t->rf | TDA7432_MUTE);
390 tda7432_write(sd, TDA7432_RR, t->rr | TDA7432_MUTE);
392 tda7432_write(sd, TDA7432_LF, t->lf);
393 tda7432_write(sd, TDA7432_LR, t->lr);
394 tda7432_write(sd, TDA7432_RF, t->rf);
395 tda7432_write(sd, TDA7432_RR, t->rr);
400 static int tda7432_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
403 case V4L2_CID_AUDIO_VOLUME:
404 return v4l2_ctrl_query_fill(qc, 0, 65535, 65535 / 100, 58880);
405 case V4L2_CID_AUDIO_MUTE:
406 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
407 case V4L2_CID_AUDIO_BALANCE:
408 case V4L2_CID_AUDIO_BASS:
409 case V4L2_CID_AUDIO_TREBLE:
410 return v4l2_ctrl_query_fill(qc, 0, 65535, 65535 / 100, 32768);
415 /* ----------------------------------------------------------------------- */
417 static const struct v4l2_subdev_core_ops tda7432_core_ops = {
418 .queryctrl = tda7432_queryctrl,
419 .g_ctrl = tda7432_g_ctrl,
420 .s_ctrl = tda7432_s_ctrl,
423 static const struct v4l2_subdev_ops tda7432_ops = {
424 .core = &tda7432_core_ops,
427 /* ----------------------------------------------------------------------- */
429 /* *********************** *
430 * i2c interface functions *
431 * *********************** */
433 static int tda7432_probe(struct i2c_client *client,
434 const struct i2c_device_id *id)
437 struct v4l2_subdev *sd;
439 v4l_info(client, "chip found @ 0x%02x (%s)\n",
440 client->addr << 1, client->adapter->name);
442 t = kzalloc(sizeof(*t), GFP_KERNEL);
446 v4l2_i2c_subdev_init(sd, client, &tda7432_ops);
447 if (loudness < 0 || loudness > 15) {
448 v4l2_warn(sd, "loudness parameter must be between 0 and 15\n");
459 static int tda7432_remove(struct i2c_client *client)
461 struct v4l2_subdev *sd = i2c_get_clientdata(client);
464 v4l2_device_unregister_subdev(sd);
469 static const struct i2c_device_id tda7432_id[] = {
473 MODULE_DEVICE_TABLE(i2c, tda7432_id);
475 static struct i2c_driver tda7432_driver = {
477 .owner = THIS_MODULE,
480 .probe = tda7432_probe,
481 .remove = tda7432_remove,
482 .id_table = tda7432_id,
485 static __init int init_tda7432(void)
487 return i2c_add_driver(&tda7432_driver);
490 static __exit void exit_tda7432(void)
492 i2c_del_driver(&tda7432_driver);
495 module_init(init_tda7432);
496 module_exit(exit_tda7432);