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 * This code is placed under the terms of the GNU General Public License
12 * Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
13 * Which was based on tda8425.c by Greg Alexander (c) 1998
16 * debug - set to 1 if you'd like to see debug messages
17 * set to 2 if you'd like to be inundated with debug messages
19 * loudness - set between 0 and 15 for varying degrees of loudness effect
21 * maxvol - set maximium volume to +20db (1), default is 0db(0)
24 * Revision: 0.7 - maxvol module parm to set maximium volume 0db or +20db
25 * store if muted so we can return it
26 * change balance only if flaged to
27 * Revision: 0.6 - added tone controls
28 * Revision: 0.5 - Fixed odd balance problem
29 * Revision: 0.4 - added muting
30 * Revision: 0.3 - Fixed silly reversed volume controls. :)
31 * Revision: 0.2 - Cleaned up #defines
32 * fixed volume control
33 * Added I2C_DRIVERID_TDA7432
34 * added loudness insmod control
35 * Revision: 0.1 - initial version
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/kernel.h>
41 #include <linux/sched.h>
42 #include <linux/string.h>
43 #include <linux/timer.h>
44 #include <linux/delay.h>
45 #include <linux/errno.h>
46 #include <linux/slab.h>
47 #include <linux/videodev.h>
48 #include <linux/i2c.h>
49 #include <linux/i2c-algo-bit.h>
52 #include <media/audiochip.h>
55 #ifndef VIDEO_AUDIO_BALANCE
56 # define VIDEO_AUDIO_BALANCE 32
59 MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
60 MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
61 MODULE_LICENSE("GPL");
64 static int loudness; /* disable loudness by default */
65 static int debug; /* insmod parameter */
66 module_param(debug, int, S_IRUGO | S_IWUSR);
67 module_param(loudness, int, S_IRUGO);
68 MODULE_PARM_DESC(maxvol,"Set maximium volume to +20db (0), default is 0db(1)");
69 module_param(maxvol, int, S_IRUGO | S_IWUSR);
72 /* Address to scan (I2C address of this chip) */
73 static unsigned short normal_i2c[] = {
79 /* Structure of address and subaddresses for the tda7432 */
91 static struct i2c_driver driver;
92 static struct i2c_client client_template;
94 #define dprintk if (debug) printk
95 #define d2printk if (debug > 1) printk
97 /* The TDA7432 is made by STS-Thompson
99 * http://us.st.com/stonline/books/pdf/docs/4056.pdf
101 * TDA7432: I2C-bus controlled basic audio processor
103 * The TDA7432 controls basic audio functions like volume, balance,
104 * and tone control (including loudness). It also has four channel
105 * output (for front and rear). Since most vidcap cards probably
106 * don't have 4 channel output, this driver will set front & rear
107 * together (no independent control).
110 /* Subaddresses for TDA7432 */
112 #define TDA7432_IN 0x00 /* Input select */
113 #define TDA7432_VL 0x01 /* Volume */
114 #define TDA7432_TN 0x02 /* Bass, Treble (Tone) */
115 #define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */
116 #define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */
117 #define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */
118 #define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */
119 #define TDA7432_LD 0x07 /* Loudness */
122 /* Masks for bits in TDA7432 subaddresses */
124 /* Many of these not used - just for documentation */
126 /* Subaddress 0x00 - Input selection and bass control */
128 /* Bits 0,1,2 control input:
129 * 0x00 - Stereo input
131 * 0x03 - Mute (Using Attenuators Plays better with modules)
132 * Mono probably isn't used - I'm guessing only the stereo
133 * input is connected on most cards, so we'll set it to stereo.
135 * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
136 * Bit 4 controls bass range: 0/1 is extended/standard bass range
138 * Highest 3 bits not used
141 #define TDA7432_STEREO_IN 0
142 #define TDA7432_MONO_IN 2 /* Probably won't be used */
143 #define TDA7432_BASS_SYM 1 << 3
144 #define TDA7432_BASS_NORM 1 << 4
146 /* Subaddress 0x01 - Volume */
148 /* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
149 * Recommended maximum is +20 dB
156 * MSB (bit 7) controls loudness: 1/0 is loudness on/off
159 #define TDA7432_VOL_0DB 0x20
160 #define TDA7432_LD_ON 1 << 7
163 /* Subaddress 0x02 - Tone control */
165 /* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
166 * 0x0 is 14dB, 0x7 is 0dB
168 * Bit 3 controls treble attenuation/gain (sign)
170 * 0 = attenuation (-)
172 * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
173 * (This is only true for normal base range, set in 0x00)
174 * 0x0 << 4 is 14dB, 0x7 is 0dB
176 * Bit 7 controls bass attenuation/gain (sign)
178 * 0 << 7 = attenuation (-)
181 * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
184 #define TDA7432_TREBLE_0DB 0xf
185 #define TDA7432_TREBLE 7
186 #define TDA7432_TREBLE_GAIN 1 << 3
187 #define TDA7432_BASS_0DB 0xf
188 #define TDA7432_BASS 7 << 4
189 #define TDA7432_BASS_GAIN 1 << 7
192 /* Subaddress 0x03 - Left Front attenuation */
193 /* Subaddress 0x04 - Left Rear attenuation */
194 /* Subaddress 0x05 - Right Front attenuation */
195 /* Subaddress 0x06 - Right Rear attenuation */
197 /* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
203 * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
204 * We'll use the mute on the input, though (above)
208 #define TDA7432_ATTEN_0DB 0x00
209 #define TDA7432_MUTE 0x1 << 5
212 /* Subaddress 0x07 - Loudness Control */
214 /* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
215 * when bit 4 is NOT set
220 * If bit 4 is set, then there is a flat attenuation according to
221 * the lower 4 bits, as above.
230 static int tda7432_write(struct i2c_client *client, int subaddr, int val)
232 unsigned char buffer[2];
233 d2printk("tda7432: In tda7432_write\n");
234 dprintk("tda7432: Writing %d 0x%x\n", subaddr, val);
237 if (2 != i2c_master_send(client,buffer,2)) {
238 printk(KERN_WARNING "tda7432: I/O error, trying (write %d 0x%x)\n",
245 /* I don't think we ever actually _read_ the chip... */
247 static int tda7432_set(struct i2c_client *client)
249 struct tda7432 *t = i2c_get_clientdata(client);
250 unsigned char buf[16];
251 d2printk("tda7432: In tda7432_set\n");
254 "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
255 t->input,t->volume,t->bass,t->treble,t->lf,t->lr,t->rf,t->rr,t->loud);
266 if (10 != i2c_master_send(client,buf,10)) {
267 printk(KERN_WARNING "tda7432: I/O error, trying tda7432_set\n");
274 static void do_tda7432_init(struct i2c_client *client)
276 struct tda7432 *t = i2c_get_clientdata(client);
277 d2printk("tda7432: In tda7432_init\n");
279 t->input = TDA7432_STEREO_IN | /* Main (stereo) input */
280 TDA7432_BASS_SYM | /* Symmetric bass cut */
281 TDA7432_BASS_NORM; /* Normal bass range */
282 t->volume = 0x3b ; /* -27dB Volume */
283 if (loudness) /* Turn loudness on? */
284 t->volume |= TDA7432_LD_ON;
285 t->muted = VIDEO_AUDIO_MUTE;
286 t->treble = TDA7432_TREBLE_0DB; /* 0dB Treble */
287 t->bass = TDA7432_BASS_0DB; /* 0dB Bass */
288 t->lf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
289 t->lr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
290 t->rf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
291 t->rr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
292 t->loud = loudness; /* insmod parameter */
297 /* *********************** *
298 * i2c interface functions *
299 * *********************** */
301 static int tda7432_attach(struct i2c_adapter *adap, int addr, int kind)
304 struct i2c_client *client;
305 d2printk("tda7432: In tda7432_attach\n");
307 t = kmalloc(sizeof *t,GFP_KERNEL);
310 memset(t,0,sizeof *t);
313 memcpy(client,&client_template,sizeof(struct i2c_client));
314 client->adapter = adap;
316 i2c_set_clientdata(client, t);
318 do_tda7432_init(client);
319 printk(KERN_INFO "tda7432: init\n");
321 i2c_attach_client(client);
325 static int tda7432_probe(struct i2c_adapter *adap)
327 #ifdef I2C_CLASS_TV_ANALOG
328 if (adap->class & I2C_CLASS_TV_ANALOG)
329 return i2c_probe(adap, &addr_data, tda7432_attach);
331 if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))
332 return i2c_probe(adap, &addr_data, tda7432_attach);
337 static int tda7432_detach(struct i2c_client *client)
339 struct tda7432 *t = i2c_get_clientdata(client);
341 do_tda7432_init(client);
342 i2c_detach_client(client);
348 static int tda7432_command(struct i2c_client *client,
349 unsigned int cmd, void *arg)
351 struct tda7432 *t = i2c_get_clientdata(client);
352 d2printk("tda7432: In tda7432_command\n");
355 /* --- v4l ioctls --- */
356 /* take care: bttv does userspace copying, we'll get a
357 kernel pointer here... */
359 /* Query card - scale from TDA7432 settings to V4L settings */
362 struct video_audio *va = arg;
363 dprintk("tda7432: VIDIOCGAUDIO\n");
365 va->flags |= VIDEO_AUDIO_VOLUME |
370 va->flags |= VIDEO_AUDIO_MUTE;
371 va->mode |= VIDEO_SOUND_STEREO;
372 /* Master volume control
373 * V4L volume is min 0, max 65535
375 * Min (-79dB) is 0x6f
376 * Max (+20dB) is 0x07 (630)
377 * Max (0dB) is 0x20 (829)
378 * (Mask out bit 7 of vol - it's for the loudness setting)
380 if (!maxvol){ /* max +20db */
381 va->volume = ( 0x6f - (t->volume & 0x7F) ) * 630;
382 } else { /* max 0db */
383 va->volume = ( 0x6f - (t->volume & 0x7F) ) * 829;
386 /* Balance depends on L,R attenuation
387 * V4L balance is 0 to 65535, middle is 32768
388 * TDA7432 attenuation: min (0dB) is 0, max (-37.5dB) is 0x1f
389 * to scale up to V4L numbers, mult by 1057
390 * attenuation exists for lf, lr, rf, rr
391 * we use only lf and rf (front channels)
394 if ( (t->lf) < (t->rf) )
395 /* right is attenuated, balance shifted left */
396 va->balance = (32768 - 1057*(t->rf));
398 /* left is attenuated, balance shifted right */
399 va->balance = (32768 + 1057*(t->lf));
401 /* Bass/treble 4 bits each */
404 va->bass = ~(va->bass - 0x8) & 0xf;
405 va->bass = (va->bass << 12)+(va->bass << 8)+(va->bass << 4)+(va->bass);
406 va->treble=t->treble;
407 if(va->treble >= 0x8)
408 va->treble = ~(va->treble - 0x8) & 0xf;
409 va->treble = (va->treble << 12)+(va->treble << 8)+(va->treble << 4)+(va->treble);
411 break; /* VIDIOCGAUDIO case */
414 /* Set card - scale from V4L settings to TDA7432 settings */
417 struct video_audio *va = arg;
418 dprintk("tda7432: VIDEOCSAUDIO\n");
420 if(va->flags & VIDEO_AUDIO_VOLUME){
421 if(!maxvol){ /* max +20db */
422 t->volume = 0x6f - ((va->volume)/630);
423 } else { /* max 0db */
424 t->volume = 0x6f - ((va->volume)/829);
427 if (loudness) /* Turn on the loudness bit */
428 t->volume |= TDA7432_LD_ON;
430 tda7432_write(client,TDA7432_VL, t->volume);
433 if(va->flags & VIDEO_AUDIO_BASS)
435 t->bass = va->bass >> 12;
437 t->bass = (~t->bass & 0xf) + 0x8 ;
439 if(va->flags & VIDEO_AUDIO_TREBLE)
441 t->treble= va->treble >> 12;
443 t->treble = (~t->treble & 0xf) + 0x8 ;
445 if(va->flags & (VIDEO_AUDIO_TREBLE| VIDEO_AUDIO_BASS))
446 tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble );
448 if(va->flags & VIDEO_AUDIO_BALANCE) {
449 if (va->balance < 32768)
451 /* shifted to left, attenuate right */
452 t->rr = (32768 - va->balance)/1057;
454 t->lr = TDA7432_ATTEN_0DB;
455 t->lf = TDA7432_ATTEN_0DB;
457 else if(va->balance > 32769)
459 /* shifted to right, attenuate left */
460 t->lf = (va->balance - 32768)/1057;
462 t->rr = TDA7432_ATTEN_0DB;
463 t->rf = TDA7432_ATTEN_0DB;
468 t->rr = TDA7432_ATTEN_0DB;
469 t->rf = TDA7432_ATTEN_0DB;
470 t->lf = TDA7432_ATTEN_0DB;
471 t->lr = TDA7432_ATTEN_0DB;
475 t->muted=(va->flags & VIDEO_AUDIO_MUTE);
478 /* Mute & update balance*/
479 tda7432_write(client,TDA7432_LF, t->lf | TDA7432_MUTE);
480 tda7432_write(client,TDA7432_LR, t->lr | TDA7432_MUTE);
481 tda7432_write(client,TDA7432_RF, t->rf | TDA7432_MUTE);
482 tda7432_write(client,TDA7432_RR, t->rr | TDA7432_MUTE);
484 tda7432_write(client,TDA7432_LF, t->lf);
485 tda7432_write(client,TDA7432_LR, t->lr);
486 tda7432_write(client,TDA7432_RF, t->rf);
487 tda7432_write(client,TDA7432_RR, t->rr);
492 } /* end of VIDEOCSAUDIO case */
494 default: /* Not VIDEOCGAUDIO or VIDEOCSAUDIO */
497 d2printk("tda7432: Default\n");
499 } /* end of (cmd) switch */
504 static struct i2c_driver driver = {
505 .owner = THIS_MODULE,
506 .name = "i2c tda7432 driver",
507 .id = I2C_DRIVERID_TDA7432,
508 .flags = I2C_DF_NOTIFY,
509 .attach_adapter = tda7432_probe,
510 .detach_client = tda7432_detach,
511 .command = tda7432_command,
514 static struct i2c_client client_template =
516 I2C_DEVNAME("tda7432"),
520 static int __init tda7432_init(void)
522 if ( (loudness < 0) || (loudness > 15) ) {
523 printk(KERN_ERR "tda7432: loudness parameter must be between 0 and 15\n");
527 return i2c_add_driver(&driver);
530 static void __exit tda7432_fini(void)
532 i2c_del_driver(&driver);
535 module_init(tda7432_init);
536 module_exit(tda7432_fini);