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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * For the STS-Thompson TDA7432 audio processor chip | |
3 | * | |
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. | |
7 | * | |
8 | * Muting and tone control by Jonathan Isom <jisom@ematic.com> | |
9 | * | |
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 | |
14 | * | |
15 | * OPTIONS: | |
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 | |
18 | * | |
19 | * loudness - set between 0 and 15 for varying degrees of loudness effect | |
20 | * | |
21 | * maxvol - set maximium volume to +20db (1), default is 0db(0) | |
22 | * | |
23 | * | |
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 | |
36 | */ | |
37 | ||
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> | |
50 | ||
51 | #include "bttv.h" | |
52 | #include <media/audiochip.h> | |
53 | #include <media/id.h> | |
54 | ||
55 | #ifndef VIDEO_AUDIO_BALANCE | |
56 | # define VIDEO_AUDIO_BALANCE 32 | |
57 | #endif | |
58 | ||
59 | MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>"); | |
60 | MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip"); | |
61 | MODULE_LICENSE("GPL"); | |
62 | ||
63 | static int maxvol; | |
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); | |
70 | ||
71 | ||
72 | /* Address to scan (I2C address of this chip) */ | |
73 | static unsigned short normal_i2c[] = { | |
74 | I2C_TDA7432 >> 1, | |
75 | I2C_CLIENT_END, | |
76 | }; | |
77 | static unsigned short normal_i2c_range[] = { I2C_CLIENT_END, I2C_CLIENT_END }; | |
78 | I2C_CLIENT_INSMOD; | |
79 | ||
80 | /* Structure of address and subaddresses for the tda7432 */ | |
81 | ||
82 | struct tda7432 { | |
83 | int addr; | |
84 | int input; | |
85 | int volume; | |
86 | int muted; | |
87 | int bass, treble; | |
88 | int lf, lr, rf, rr; | |
89 | int loud; | |
90 | struct i2c_client c; | |
91 | }; | |
92 | static struct i2c_driver driver; | |
93 | static struct i2c_client client_template; | |
94 | ||
95 | #define dprintk if (debug) printk | |
96 | #define d2printk if (debug > 1) printk | |
97 | ||
98 | /* The TDA7432 is made by STS-Thompson | |
99 | * http://www.st.com | |
100 | * http://us.st.com/stonline/books/pdf/docs/4056.pdf | |
101 | * | |
102 | * TDA7432: I2C-bus controlled basic audio processor | |
103 | * | |
104 | * The TDA7432 controls basic audio functions like volume, balance, | |
105 | * and tone control (including loudness). It also has four channel | |
106 | * output (for front and rear). Since most vidcap cards probably | |
107 | * don't have 4 channel output, this driver will set front & rear | |
108 | * together (no independent control). | |
109 | */ | |
110 | ||
111 | /* Subaddresses for TDA7432 */ | |
112 | ||
113 | #define TDA7432_IN 0x00 /* Input select */ | |
114 | #define TDA7432_VL 0x01 /* Volume */ | |
115 | #define TDA7432_TN 0x02 /* Bass, Treble (Tone) */ | |
116 | #define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */ | |
117 | #define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */ | |
118 | #define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */ | |
119 | #define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */ | |
120 | #define TDA7432_LD 0x07 /* Loudness */ | |
121 | ||
122 | ||
123 | /* Masks for bits in TDA7432 subaddresses */ | |
124 | ||
125 | /* Many of these not used - just for documentation */ | |
126 | ||
127 | /* Subaddress 0x00 - Input selection and bass control */ | |
128 | ||
129 | /* Bits 0,1,2 control input: | |
130 | * 0x00 - Stereo input | |
131 | * 0x02 - Mono input | |
132 | * 0x03 - Mute (Using Attenuators Plays better with modules) | |
133 | * Mono probably isn't used - I'm guessing only the stereo | |
134 | * input is connected on most cards, so we'll set it to stereo. | |
135 | * | |
136 | * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut | |
137 | * Bit 4 controls bass range: 0/1 is extended/standard bass range | |
138 | * | |
139 | * Highest 3 bits not used | |
140 | */ | |
141 | ||
142 | #define TDA7432_STEREO_IN 0 | |
143 | #define TDA7432_MONO_IN 2 /* Probably won't be used */ | |
144 | #define TDA7432_BASS_SYM 1 << 3 | |
145 | #define TDA7432_BASS_NORM 1 << 4 | |
146 | ||
147 | /* Subaddress 0x01 - Volume */ | |
148 | ||
149 | /* Lower 7 bits control volume from -79dB to +32dB in 1dB steps | |
150 | * Recommended maximum is +20 dB | |
151 | * | |
152 | * +32dB: 0x00 | |
153 | * +20dB: 0x0c | |
154 | * 0dB: 0x20 | |
155 | * -79dB: 0x6f | |
156 | * | |
157 | * MSB (bit 7) controls loudness: 1/0 is loudness on/off | |
158 | */ | |
159 | ||
160 | #define TDA7432_VOL_0DB 0x20 | |
161 | #define TDA7432_LD_ON 1 << 7 | |
162 | ||
163 | ||
164 | /* Subaddress 0x02 - Tone control */ | |
165 | ||
166 | /* Bits 0,1,2 control absolute treble gain from 0dB to 14dB | |
167 | * 0x0 is 14dB, 0x7 is 0dB | |
168 | * | |
169 | * Bit 3 controls treble attenuation/gain (sign) | |
170 | * 1 = gain (+) | |
171 | * 0 = attenuation (-) | |
172 | * | |
173 | * Bits 4,5,6 control absolute bass gain from 0dB to 14dB | |
174 | * (This is only true for normal base range, set in 0x00) | |
175 | * 0x0 << 4 is 14dB, 0x7 is 0dB | |
176 | * | |
177 | * Bit 7 controls bass attenuation/gain (sign) | |
178 | * 1 << 7 = gain (+) | |
179 | * 0 << 7 = attenuation (-) | |
180 | * | |
181 | * Example: | |
182 | * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble | |
183 | */ | |
184 | ||
185 | #define TDA7432_TREBLE_0DB 0xf | |
186 | #define TDA7432_TREBLE 7 | |
187 | #define TDA7432_TREBLE_GAIN 1 << 3 | |
188 | #define TDA7432_BASS_0DB 0xf | |
189 | #define TDA7432_BASS 7 << 4 | |
190 | #define TDA7432_BASS_GAIN 1 << 7 | |
191 | ||
192 | ||
193 | /* Subaddress 0x03 - Left Front attenuation */ | |
194 | /* Subaddress 0x04 - Left Rear attenuation */ | |
195 | /* Subaddress 0x05 - Right Front attenuation */ | |
196 | /* Subaddress 0x06 - Right Rear attenuation */ | |
197 | ||
198 | /* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB | |
199 | * in 1.5dB steps. | |
200 | * | |
201 | * 0x00 is 0dB | |
202 | * 0x1f is -37.5dB | |
203 | * | |
204 | * Bit 5 mutes that channel when set (1 = mute, 0 = unmute) | |
205 | * We'll use the mute on the input, though (above) | |
206 | * Bits 6,7 unused | |
207 | */ | |
208 | ||
209 | #define TDA7432_ATTEN_0DB 0x00 | |
210 | #define TDA7432_MUTE 0x1 << 5 | |
211 | ||
212 | ||
213 | /* Subaddress 0x07 - Loudness Control */ | |
214 | ||
215 | /* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps | |
216 | * when bit 4 is NOT set | |
217 | * | |
218 | * 0x0 is 0dB | |
219 | * 0xf is -15dB | |
220 | * | |
221 | * If bit 4 is set, then there is a flat attenuation according to | |
222 | * the lower 4 bits, as above. | |
223 | * | |
224 | * Bits 5,6,7 unused | |
225 | */ | |
226 | ||
227 | ||
228 | ||
229 | /* Begin code */ | |
230 | ||
231 | static int tda7432_write(struct i2c_client *client, int subaddr, int val) | |
232 | { | |
233 | unsigned char buffer[2]; | |
234 | d2printk("tda7432: In tda7432_write\n"); | |
235 | dprintk("tda7432: Writing %d 0x%x\n", subaddr, val); | |
236 | buffer[0] = subaddr; | |
237 | buffer[1] = val; | |
238 | if (2 != i2c_master_send(client,buffer,2)) { | |
239 | printk(KERN_WARNING "tda7432: I/O error, trying (write %d 0x%x)\n", | |
240 | subaddr, val); | |
241 | return -1; | |
242 | } | |
243 | return 0; | |
244 | } | |
245 | ||
246 | /* I don't think we ever actually _read_ the chip... */ | |
247 | #if 0 | |
248 | static int tda7432_read(struct i2c_client *client) | |
249 | { | |
250 | unsigned char buffer; | |
251 | d2printk("tda7432: In tda7432_read\n"); | |
252 | if (1 != i2c_master_recv(client,&buffer,1)) { | |
253 | printk(KERN_WARNING "tda7432: I/O error, trying (read)\n"); | |
254 | return -1; | |
255 | } | |
256 | dprintk("tda7432: Read 0x%02x\n", buffer); | |
257 | return buffer; | |
258 | } | |
259 | #endif | |
260 | ||
261 | static int tda7432_set(struct i2c_client *client) | |
262 | { | |
263 | struct tda7432 *t = i2c_get_clientdata(client); | |
264 | unsigned char buf[16]; | |
265 | d2printk("tda7432: In tda7432_set\n"); | |
266 | ||
267 | dprintk(KERN_INFO | |
268 | "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n", | |
269 | t->input,t->volume,t->bass,t->treble,t->lf,t->lr,t->rf,t->rr,t->loud); | |
270 | buf[0] = TDA7432_IN; | |
271 | buf[1] = t->input; | |
272 | buf[2] = t->volume; | |
273 | buf[3] = t->bass; | |
274 | buf[4] = t->treble; | |
275 | buf[5] = t->lf; | |
276 | buf[6] = t->lr; | |
277 | buf[7] = t->rf; | |
278 | buf[8] = t->rr; | |
279 | buf[9] = t->loud; | |
280 | if (10 != i2c_master_send(client,buf,10)) { | |
281 | printk(KERN_WARNING "tda7432: I/O error, trying tda7432_set\n"); | |
282 | return -1; | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static void do_tda7432_init(struct i2c_client *client) | |
289 | { | |
290 | struct tda7432 *t = i2c_get_clientdata(client); | |
291 | d2printk("tda7432: In tda7432_init\n"); | |
292 | ||
293 | t->input = TDA7432_STEREO_IN | /* Main (stereo) input */ | |
294 | TDA7432_BASS_SYM | /* Symmetric bass cut */ | |
295 | TDA7432_BASS_NORM; /* Normal bass range */ | |
296 | t->volume = 0x3b ; /* -27dB Volume */ | |
297 | if (loudness) /* Turn loudness on? */ | |
298 | t->volume |= TDA7432_LD_ON; | |
299 | t->muted = VIDEO_AUDIO_MUTE; | |
300 | t->treble = TDA7432_TREBLE_0DB; /* 0dB Treble */ | |
301 | t->bass = TDA7432_BASS_0DB; /* 0dB Bass */ | |
302 | t->lf = TDA7432_ATTEN_0DB; /* 0dB attenuation */ | |
303 | t->lr = TDA7432_ATTEN_0DB; /* 0dB attenuation */ | |
304 | t->rf = TDA7432_ATTEN_0DB; /* 0dB attenuation */ | |
305 | t->rr = TDA7432_ATTEN_0DB; /* 0dB attenuation */ | |
306 | t->loud = loudness; /* insmod parameter */ | |
307 | ||
308 | tda7432_set(client); | |
309 | } | |
310 | ||
311 | /* *********************** * | |
312 | * i2c interface functions * | |
313 | * *********************** */ | |
314 | ||
315 | static int tda7432_attach(struct i2c_adapter *adap, int addr, int kind) | |
316 | { | |
317 | struct tda7432 *t; | |
318 | struct i2c_client *client; | |
319 | d2printk("tda7432: In tda7432_attach\n"); | |
320 | ||
321 | t = kmalloc(sizeof *t,GFP_KERNEL); | |
322 | if (!t) | |
323 | return -ENOMEM; | |
324 | memset(t,0,sizeof *t); | |
325 | ||
326 | client = &t->c; | |
327 | memcpy(client,&client_template,sizeof(struct i2c_client)); | |
328 | client->adapter = adap; | |
329 | client->addr = addr; | |
330 | i2c_set_clientdata(client, t); | |
331 | ||
332 | do_tda7432_init(client); | |
333 | printk(KERN_INFO "tda7432: init\n"); | |
334 | ||
335 | i2c_attach_client(client); | |
336 | return 0; | |
337 | } | |
338 | ||
339 | static int tda7432_probe(struct i2c_adapter *adap) | |
340 | { | |
341 | #ifdef I2C_CLASS_TV_ANALOG | |
342 | if (adap->class & I2C_CLASS_TV_ANALOG) | |
343 | return i2c_probe(adap, &addr_data, tda7432_attach); | |
344 | #else | |
345 | if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848)) | |
346 | return i2c_probe(adap, &addr_data, tda7432_attach); | |
347 | #endif | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static int tda7432_detach(struct i2c_client *client) | |
352 | { | |
353 | struct tda7432 *t = i2c_get_clientdata(client); | |
354 | ||
355 | do_tda7432_init(client); | |
356 | i2c_detach_client(client); | |
357 | ||
358 | kfree(t); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | static int tda7432_command(struct i2c_client *client, | |
363 | unsigned int cmd, void *arg) | |
364 | { | |
365 | struct tda7432 *t = i2c_get_clientdata(client); | |
366 | d2printk("tda7432: In tda7432_command\n"); | |
367 | ||
368 | switch (cmd) { | |
369 | /* --- v4l ioctls --- */ | |
370 | /* take care: bttv does userspace copying, we'll get a | |
371 | kernel pointer here... */ | |
372 | ||
373 | /* Query card - scale from TDA7432 settings to V4L settings */ | |
374 | case VIDIOCGAUDIO: | |
375 | { | |
376 | struct video_audio *va = arg; | |
377 | dprintk("tda7432: VIDIOCGAUDIO\n"); | |
378 | ||
379 | va->flags |= VIDEO_AUDIO_VOLUME | | |
380 | VIDEO_AUDIO_BASS | | |
381 | VIDEO_AUDIO_TREBLE | | |
382 | VIDEO_AUDIO_MUTABLE; | |
383 | if (t->muted) | |
384 | va->flags |= VIDEO_AUDIO_MUTE; | |
385 | va->mode |= VIDEO_SOUND_STEREO; | |
386 | /* Master volume control | |
387 | * V4L volume is min 0, max 65535 | |
388 | * TDA7432 Volume: | |
389 | * Min (-79dB) is 0x6f | |
390 | * Max (+20dB) is 0x07 (630) | |
391 | * Max (0dB) is 0x20 (829) | |
392 | * (Mask out bit 7 of vol - it's for the loudness setting) | |
393 | */ | |
394 | if (!maxvol){ /* max +20db */ | |
395 | va->volume = ( 0x6f - (t->volume & 0x7F) ) * 630; | |
396 | } else { /* max 0db */ | |
397 | va->volume = ( 0x6f - (t->volume & 0x7F) ) * 829; | |
398 | } | |
399 | ||
400 | /* Balance depends on L,R attenuation | |
401 | * V4L balance is 0 to 65535, middle is 32768 | |
402 | * TDA7432 attenuation: min (0dB) is 0, max (-37.5dB) is 0x1f | |
403 | * to scale up to V4L numbers, mult by 1057 | |
404 | * attenuation exists for lf, lr, rf, rr | |
405 | * we use only lf and rf (front channels) | |
406 | */ | |
407 | ||
408 | if ( (t->lf) < (t->rf) ) | |
409 | /* right is attenuated, balance shifted left */ | |
410 | va->balance = (32768 - 1057*(t->rf)); | |
411 | else | |
412 | /* left is attenuated, balance shifted right */ | |
413 | va->balance = (32768 + 1057*(t->lf)); | |
414 | ||
415 | /* Bass/treble 4 bits each */ | |
416 | va->bass=t->bass; | |
417 | if(va->bass >= 0x8) | |
418 | va->bass = ~(va->bass - 0x8) & 0xf; | |
419 | va->bass = (va->bass << 12)+(va->bass << 8)+(va->bass << 4)+(va->bass); | |
420 | va->treble=t->treble; | |
421 | if(va->treble >= 0x8) | |
422 | va->treble = ~(va->treble - 0x8) & 0xf; | |
423 | va->treble = (va->treble << 12)+(va->treble << 8)+(va->treble << 4)+(va->treble); | |
424 | ||
425 | break; /* VIDIOCGAUDIO case */ | |
426 | } | |
427 | ||
428 | /* Set card - scale from V4L settings to TDA7432 settings */ | |
429 | case VIDIOCSAUDIO: | |
430 | { | |
431 | struct video_audio *va = arg; | |
432 | dprintk("tda7432: VIDEOCSAUDIO\n"); | |
433 | ||
434 | if(va->flags & VIDEO_AUDIO_VOLUME){ | |
435 | if(!maxvol){ /* max +20db */ | |
436 | t->volume = 0x6f - ((va->volume)/630); | |
437 | } else { /* max 0db */ | |
438 | t->volume = 0x6f - ((va->volume)/829); | |
439 | } | |
440 | ||
441 | if (loudness) /* Turn on the loudness bit */ | |
442 | t->volume |= TDA7432_LD_ON; | |
443 | ||
444 | tda7432_write(client,TDA7432_VL, t->volume); | |
445 | } | |
446 | ||
447 | if(va->flags & VIDEO_AUDIO_BASS) | |
448 | { | |
449 | t->bass = va->bass >> 12; | |
450 | if(t->bass>= 0x8) | |
451 | t->bass = (~t->bass & 0xf) + 0x8 ; | |
452 | } | |
453 | if(va->flags & VIDEO_AUDIO_TREBLE) | |
454 | { | |
455 | t->treble= va->treble >> 12; | |
456 | if(t->treble>= 0x8) | |
457 | t->treble = (~t->treble & 0xf) + 0x8 ; | |
458 | } | |
459 | if(va->flags & (VIDEO_AUDIO_TREBLE| VIDEO_AUDIO_BASS)) | |
460 | tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble ); | |
461 | ||
462 | if(va->flags & VIDEO_AUDIO_BALANCE) { | |
463 | if (va->balance < 32768) | |
464 | { | |
465 | /* shifted to left, attenuate right */ | |
466 | t->rr = (32768 - va->balance)/1057; | |
467 | t->rf = t->rr; | |
468 | t->lr = TDA7432_ATTEN_0DB; | |
469 | t->lf = TDA7432_ATTEN_0DB; | |
470 | } | |
471 | else if(va->balance > 32769) | |
472 | { | |
473 | /* shifted to right, attenuate left */ | |
474 | t->lf = (va->balance - 32768)/1057; | |
475 | t->lr = t->lf; | |
476 | t->rr = TDA7432_ATTEN_0DB; | |
477 | t->rf = TDA7432_ATTEN_0DB; | |
478 | } | |
479 | else | |
480 | { | |
481 | /* centered */ | |
482 | t->rr = TDA7432_ATTEN_0DB; | |
483 | t->rf = TDA7432_ATTEN_0DB; | |
484 | t->lf = TDA7432_ATTEN_0DB; | |
485 | t->lr = TDA7432_ATTEN_0DB; | |
486 | } | |
487 | } | |
488 | ||
489 | t->muted=(va->flags & VIDEO_AUDIO_MUTE); | |
490 | if (t->muted) | |
491 | { | |
492 | /* Mute & update balance*/ | |
493 | tda7432_write(client,TDA7432_LF, t->lf | TDA7432_MUTE); | |
494 | tda7432_write(client,TDA7432_LR, t->lr | TDA7432_MUTE); | |
495 | tda7432_write(client,TDA7432_RF, t->rf | TDA7432_MUTE); | |
496 | tda7432_write(client,TDA7432_RR, t->rr | TDA7432_MUTE); | |
497 | } else { | |
498 | tda7432_write(client,TDA7432_LF, t->lf); | |
499 | tda7432_write(client,TDA7432_LR, t->lr); | |
500 | tda7432_write(client,TDA7432_RF, t->rf); | |
501 | tda7432_write(client,TDA7432_RR, t->rr); | |
502 | } | |
503 | ||
504 | break; | |
505 | ||
506 | } /* end of VIDEOCSAUDIO case */ | |
507 | ||
508 | default: /* Not VIDEOCGAUDIO or VIDEOCSAUDIO */ | |
509 | ||
510 | /* nothing */ | |
511 | d2printk("tda7432: Default\n"); | |
512 | ||
513 | } /* end of (cmd) switch */ | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | static struct i2c_driver driver = { | |
519 | .owner = THIS_MODULE, | |
520 | .name = "i2c tda7432 driver", | |
521 | .id = I2C_DRIVERID_TDA7432, | |
522 | .flags = I2C_DF_NOTIFY, | |
523 | .attach_adapter = tda7432_probe, | |
524 | .detach_client = tda7432_detach, | |
525 | .command = tda7432_command, | |
526 | }; | |
527 | ||
528 | static struct i2c_client client_template = | |
529 | { | |
530 | I2C_DEVNAME("tda7432"), | |
531 | .driver = &driver, | |
532 | }; | |
533 | ||
534 | static int __init tda7432_init(void) | |
535 | { | |
536 | if ( (loudness < 0) || (loudness > 15) ) { | |
537 | printk(KERN_ERR "tda7432: loudness parameter must be between 0 and 15\n"); | |
538 | return -EINVAL; | |
539 | } | |
540 | ||
541 | return i2c_add_driver(&driver); | |
542 | } | |
543 | ||
544 | static void __exit tda7432_fini(void) | |
545 | { | |
546 | i2c_del_driver(&driver); | |
547 | } | |
548 | ||
549 | module_init(tda7432_init); | |
550 | module_exit(tda7432_fini); | |
551 | ||
552 | /* | |
553 | * Local variables: | |
554 | * c-basic-offset: 8 | |
555 | * End: | |
556 | */ |