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>
54 #ifndef VIDEO_AUDIO_BALANCE
55 # define VIDEO_AUDIO_BALANCE 32
58 MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
59 MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
60 MODULE_LICENSE("GPL");
63 static int loudness; /* disable loudness by default */
64 static int debug; /* insmod parameter */
65 module_param(debug, int, S_IRUGO | S_IWUSR);
66 module_param(loudness, int, S_IRUGO);
67 MODULE_PARM_DESC(maxvol,"Set maximium volume to +20db (0), default is 0db(1)");
68 module_param(maxvol, int, S_IRUGO | S_IWUSR);
71 /* Address to scan (I2C address of this chip) */
72 static unsigned short normal_i2c[] = {
78 /* Structure of address and subaddresses for the tda7432 */
90 static struct i2c_driver driver;
91 static struct i2c_client client_template;
93 #define dprintk if (debug) printk
94 #define d2printk if (debug > 1) printk
96 /* The TDA7432 is made by STS-Thompson
98 * http://us.st.com/stonline/books/pdf/docs/4056.pdf
100 * TDA7432: I2C-bus controlled basic audio processor
102 * The TDA7432 controls basic audio functions like volume, balance,
103 * and tone control (including loudness). It also has four channel
104 * output (for front and rear). Since most vidcap cards probably
105 * don't have 4 channel output, this driver will set front & rear
106 * together (no independent control).
109 /* Subaddresses for TDA7432 */
111 #define TDA7432_IN 0x00 /* Input select */
112 #define TDA7432_VL 0x01 /* Volume */
113 #define TDA7432_TN 0x02 /* Bass, Treble (Tone) */
114 #define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */
115 #define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */
116 #define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */
117 #define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */
118 #define TDA7432_LD 0x07 /* Loudness */
121 /* Masks for bits in TDA7432 subaddresses */
123 /* Many of these not used - just for documentation */
125 /* Subaddress 0x00 - Input selection and bass control */
127 /* Bits 0,1,2 control input:
128 * 0x00 - Stereo input
130 * 0x03 - Mute (Using Attenuators Plays better with modules)
131 * Mono probably isn't used - I'm guessing only the stereo
132 * input is connected on most cards, so we'll set it to stereo.
134 * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
135 * Bit 4 controls bass range: 0/1 is extended/standard bass range
137 * Highest 3 bits not used
140 #define TDA7432_STEREO_IN 0
141 #define TDA7432_MONO_IN 2 /* Probably won't be used */
142 #define TDA7432_BASS_SYM 1 << 3
143 #define TDA7432_BASS_NORM 1 << 4
145 /* Subaddress 0x01 - Volume */
147 /* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
148 * Recommended maximum is +20 dB
155 * MSB (bit 7) controls loudness: 1/0 is loudness on/off
158 #define TDA7432_VOL_0DB 0x20
159 #define TDA7432_LD_ON 1 << 7
162 /* Subaddress 0x02 - Tone control */
164 /* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
165 * 0x0 is 14dB, 0x7 is 0dB
167 * Bit 3 controls treble attenuation/gain (sign)
169 * 0 = attenuation (-)
171 * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
172 * (This is only true for normal base range, set in 0x00)
173 * 0x0 << 4 is 14dB, 0x7 is 0dB
175 * Bit 7 controls bass attenuation/gain (sign)
177 * 0 << 7 = attenuation (-)
180 * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
183 #define TDA7432_TREBLE_0DB 0xf
184 #define TDA7432_TREBLE 7
185 #define TDA7432_TREBLE_GAIN 1 << 3
186 #define TDA7432_BASS_0DB 0xf
187 #define TDA7432_BASS 7 << 4
188 #define TDA7432_BASS_GAIN 1 << 7
191 /* Subaddress 0x03 - Left Front attenuation */
192 /* Subaddress 0x04 - Left Rear attenuation */
193 /* Subaddress 0x05 - Right Front attenuation */
194 /* Subaddress 0x06 - Right Rear attenuation */
196 /* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
202 * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
203 * We'll use the mute on the input, though (above)
207 #define TDA7432_ATTEN_0DB 0x00
208 #define TDA7432_MUTE 0x1 << 5
211 /* Subaddress 0x07 - Loudness Control */
213 /* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
214 * when bit 4 is NOT set
219 * If bit 4 is set, then there is a flat attenuation according to
220 * the lower 4 bits, as above.
229 static int tda7432_write(struct i2c_client *client, int subaddr, int val)
231 unsigned char buffer[2];
232 d2printk("tda7432: In tda7432_write\n");
233 dprintk("tda7432: Writing %d 0x%x\n", subaddr, val);
236 if (2 != i2c_master_send(client,buffer,2)) {
237 printk(KERN_WARNING "tda7432: I/O error, trying (write %d 0x%x)\n",
244 /* I don't think we ever actually _read_ the chip... */
246 static int tda7432_set(struct i2c_client *client)
248 struct tda7432 *t = i2c_get_clientdata(client);
249 unsigned char buf[16];
250 d2printk("tda7432: In tda7432_set\n");
253 "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
254 t->input,t->volume,t->bass,t->treble,t->lf,t->lr,t->rf,t->rr,t->loud);
265 if (10 != i2c_master_send(client,buf,10)) {
266 printk(KERN_WARNING "tda7432: I/O error, trying tda7432_set\n");
273 static void do_tda7432_init(struct i2c_client *client)
275 struct tda7432 *t = i2c_get_clientdata(client);
276 d2printk("tda7432: In tda7432_init\n");
278 t->input = TDA7432_STEREO_IN | /* Main (stereo) input */
279 TDA7432_BASS_SYM | /* Symmetric bass cut */
280 TDA7432_BASS_NORM; /* Normal bass range */
281 t->volume = 0x3b ; /* -27dB Volume */
282 if (loudness) /* Turn loudness on? */
283 t->volume |= TDA7432_LD_ON;
284 t->muted = VIDEO_AUDIO_MUTE;
285 t->treble = TDA7432_TREBLE_0DB; /* 0dB Treble */
286 t->bass = TDA7432_BASS_0DB; /* 0dB Bass */
287 t->lf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
288 t->lr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
289 t->rf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
290 t->rr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
291 t->loud = loudness; /* insmod parameter */
296 /* *********************** *
297 * i2c interface functions *
298 * *********************** */
300 static int tda7432_attach(struct i2c_adapter *adap, int addr, int kind)
303 struct i2c_client *client;
304 d2printk("tda7432: In tda7432_attach\n");
306 t = kmalloc(sizeof *t,GFP_KERNEL);
309 memset(t,0,sizeof *t);
312 memcpy(client,&client_template,sizeof(struct i2c_client));
313 client->adapter = adap;
315 i2c_set_clientdata(client, t);
317 do_tda7432_init(client);
318 printk(KERN_INFO "tda7432: init\n");
320 i2c_attach_client(client);
324 static int tda7432_probe(struct i2c_adapter *adap)
326 #ifdef I2C_CLASS_TV_ANALOG
327 if (adap->class & I2C_CLASS_TV_ANALOG)
328 return i2c_probe(adap, &addr_data, tda7432_attach);
330 if (adap->id == I2C_HW_B_BT848)
331 return i2c_probe(adap, &addr_data, tda7432_attach);
336 static int tda7432_detach(struct i2c_client *client)
338 struct tda7432 *t = i2c_get_clientdata(client);
340 do_tda7432_init(client);
341 i2c_detach_client(client);
347 static int tda7432_command(struct i2c_client *client,
348 unsigned int cmd, void *arg)
350 struct tda7432 *t = i2c_get_clientdata(client);
351 d2printk("tda7432: In tda7432_command\n");
354 /* --- v4l ioctls --- */
355 /* take care: bttv does userspace copying, we'll get a
356 kernel pointer here... */
358 /* Query card - scale from TDA7432 settings to V4L settings */
361 struct video_audio *va = arg;
362 dprintk("tda7432: VIDIOCGAUDIO\n");
364 va->flags |= VIDEO_AUDIO_VOLUME |
369 va->flags |= VIDEO_AUDIO_MUTE;
370 va->mode |= VIDEO_SOUND_STEREO;
371 /* Master volume control
372 * V4L volume is min 0, max 65535
374 * Min (-79dB) is 0x6f
375 * Max (+20dB) is 0x07 (630)
376 * Max (0dB) is 0x20 (829)
377 * (Mask out bit 7 of vol - it's for the loudness setting)
379 if (!maxvol){ /* max +20db */
380 va->volume = ( 0x6f - (t->volume & 0x7F) ) * 630;
381 } else { /* max 0db */
382 va->volume = ( 0x6f - (t->volume & 0x7F) ) * 829;
385 /* Balance depends on L,R attenuation
386 * V4L balance is 0 to 65535, middle is 32768
387 * TDA7432 attenuation: min (0dB) is 0, max (-37.5dB) is 0x1f
388 * to scale up to V4L numbers, mult by 1057
389 * attenuation exists for lf, lr, rf, rr
390 * we use only lf and rf (front channels)
393 if ( (t->lf) < (t->rf) )
394 /* right is attenuated, balance shifted left */
395 va->balance = (32768 - 1057*(t->rf));
397 /* left is attenuated, balance shifted right */
398 va->balance = (32768 + 1057*(t->lf));
400 /* Bass/treble 4 bits each */
403 va->bass = ~(va->bass - 0x8) & 0xf;
404 va->bass = (va->bass << 12)+(va->bass << 8)+(va->bass << 4)+(va->bass);
405 va->treble=t->treble;
406 if(va->treble >= 0x8)
407 va->treble = ~(va->treble - 0x8) & 0xf;
408 va->treble = (va->treble << 12)+(va->treble << 8)+(va->treble << 4)+(va->treble);
410 break; /* VIDIOCGAUDIO case */
413 /* Set card - scale from V4L settings to TDA7432 settings */
416 struct video_audio *va = arg;
417 dprintk("tda7432: VIDEOCSAUDIO\n");
419 if(va->flags & VIDEO_AUDIO_VOLUME){
420 if(!maxvol){ /* max +20db */
421 t->volume = 0x6f - ((va->volume)/630);
422 } else { /* max 0db */
423 t->volume = 0x6f - ((va->volume)/829);
426 if (loudness) /* Turn on the loudness bit */
427 t->volume |= TDA7432_LD_ON;
429 tda7432_write(client,TDA7432_VL, t->volume);
432 if(va->flags & VIDEO_AUDIO_BASS)
434 t->bass = va->bass >> 12;
436 t->bass = (~t->bass & 0xf) + 0x8 ;
438 if(va->flags & VIDEO_AUDIO_TREBLE)
440 t->treble= va->treble >> 12;
442 t->treble = (~t->treble & 0xf) + 0x8 ;
444 if(va->flags & (VIDEO_AUDIO_TREBLE| VIDEO_AUDIO_BASS))
445 tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble );
447 if(va->flags & VIDEO_AUDIO_BALANCE) {
448 if (va->balance < 32768)
450 /* shifted to left, attenuate right */
451 t->rr = (32768 - va->balance)/1057;
453 t->lr = TDA7432_ATTEN_0DB;
454 t->lf = TDA7432_ATTEN_0DB;
456 else if(va->balance > 32769)
458 /* shifted to right, attenuate left */
459 t->lf = (va->balance - 32768)/1057;
461 t->rr = TDA7432_ATTEN_0DB;
462 t->rf = TDA7432_ATTEN_0DB;
467 t->rr = TDA7432_ATTEN_0DB;
468 t->rf = TDA7432_ATTEN_0DB;
469 t->lf = TDA7432_ATTEN_0DB;
470 t->lr = TDA7432_ATTEN_0DB;
474 t->muted=(va->flags & VIDEO_AUDIO_MUTE);
477 /* Mute & update balance*/
478 tda7432_write(client,TDA7432_LF, t->lf | TDA7432_MUTE);
479 tda7432_write(client,TDA7432_LR, t->lr | TDA7432_MUTE);
480 tda7432_write(client,TDA7432_RF, t->rf | TDA7432_MUTE);
481 tda7432_write(client,TDA7432_RR, t->rr | TDA7432_MUTE);
483 tda7432_write(client,TDA7432_LF, t->lf);
484 tda7432_write(client,TDA7432_LR, t->lr);
485 tda7432_write(client,TDA7432_RF, t->rf);
486 tda7432_write(client,TDA7432_RR, t->rr);
491 } /* end of VIDEOCSAUDIO case */
493 default: /* Not VIDEOCGAUDIO or VIDEOCSAUDIO */
496 d2printk("tda7432: Default\n");
498 } /* end of (cmd) switch */
503 static struct i2c_driver driver = {
504 .owner = THIS_MODULE,
505 .name = "i2c tda7432 driver",
506 .id = I2C_DRIVERID_TDA7432,
507 .flags = I2C_DF_NOTIFY,
508 .attach_adapter = tda7432_probe,
509 .detach_client = tda7432_detach,
510 .command = tda7432_command,
513 static struct i2c_client client_template =
519 static int __init tda7432_init(void)
521 if ( (loudness < 0) || (loudness > 15) ) {
522 printk(KERN_ERR "tda7432: loudness parameter must be between 0 and 15\n");
526 return i2c_add_driver(&driver);
529 static void __exit tda7432_fini(void)
531 i2c_del_driver(&driver);
534 module_init(tda7432_init);
535 module_exit(tda7432_fini);