aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/cx18/cx18-av-audio.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/video/cx18/cx18-av-audio.c')
-rw-r--r--drivers/media/video/cx18/cx18-av-audio.c471
1 files changed, 471 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-av-audio.c b/drivers/media/video/cx18/cx18-av-audio.c
new file mode 100644
index 00000000000..4a24ffb17a7
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-av-audio.c
@@ -0,0 +1,471 @@
1/*
2 * cx18 ADEC audio functions
3 *
4 * Derived from cx25840-audio.c
5 *
6 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
7 * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 * 02110-1301, USA.
23 */
24
25#include "cx18-driver.h"
26
27static int set_audclk_freq(struct cx18 *cx, u32 freq)
28{
29 struct cx18_av_state *state = &cx->av_state;
30
31 if (freq != 32000 && freq != 44100 && freq != 48000)
32 return -EINVAL;
33
34 /*
35 * The PLL parameters are based on the external crystal frequency that
36 * would ideally be:
37 *
38 * NTSC Color subcarrier freq * 8 =
39 * 4.5 MHz/286 * 455/2 * 8 = 28.63636363... MHz
40 *
41 * The accidents of history and rationale that explain from where this
42 * combination of magic numbers originate can be found in:
43 *
44 * [1] Abrahams, I. C., "Choice of Chrominance Subcarrier Frequency in
45 * the NTSC Standards", Proceedings of the I-R-E, January 1954, pp 79-80
46 *
47 * [2] Abrahams, I. C., "The 'Frequency Interleaving' Principle in the
48 * NTSC Standards", Proceedings of the I-R-E, January 1954, pp 81-83
49 *
50 * As Mike Bradley has rightly pointed out, it's not the exact crystal
51 * frequency that matters, only that all parts of the driver and
52 * firmware are using the same value (close to the ideal value).
53 *
54 * Since I have a strong suspicion that, if the firmware ever assumes a
55 * crystal value at all, it will assume 28.636360 MHz, the crystal
56 * freq used in calculations in this driver will be:
57 *
58 * xtal_freq = 28.636360 MHz
59 *
60 * an error of less than 0.13 ppm which is way, way better than any off
61 * the shelf crystal will have for accuracy anyway.
62 *
63 * Below I aim to run the PLLs' VCOs near 400 MHz to minimze error.
64 *
65 * Many thanks to Jeff Campbell and Mike Bradley for their extensive
66 * investigation, experimentation, testing, and suggested solutions of
67 * of audio/video sync problems with SVideo and CVBS captures.
68 */
69
70 if (state->aud_input > CX18_AV_AUDIO_SERIAL2) {
71 switch (freq) {
72 case 32000:
73 /*
74 * VID_PLL Integer = 0x0f, VID_PLL Post Divider = 0x04
75 * AUX_PLL Integer = 0x0d, AUX PLL Post Divider = 0x20
76 */
77 cx18_av_write4(cx, 0x108, 0x200d040f);
78
79 /* VID_PLL Fraction = 0x2be2fe */
80 /* xtal * 0xf.15f17f0/4 = 108 MHz: 432 MHz pre-postdiv*/
81 cx18_av_write4(cx, 0x10c, 0x002be2fe);
82
83 /* AUX_PLL Fraction = 0x176740c */
84 /* xtal * 0xd.bb3a060/0x20 = 32000 * 384: 393 MHz p-pd*/
85 cx18_av_write4(cx, 0x110, 0x0176740c);
86
87 /* src3/4/6_ctl */
88 /* 0x1.f77f = (4 * xtal/8*2/455) / 32000 */
89 cx18_av_write4(cx, 0x900, 0x0801f77f);
90 cx18_av_write4(cx, 0x904, 0x0801f77f);
91 cx18_av_write4(cx, 0x90c, 0x0801f77f);
92
93 /* SA_MCLK_SEL=1, SA_MCLK_DIV=0x20 */
94 cx18_av_write(cx, 0x127, 0x60);
95
96 /* AUD_COUNT = 0x2fff = 8 samples * 4 * 384 - 1 */
97 cx18_av_write4(cx, 0x12c, 0x11202fff);
98
99 /*
100 * EN_AV_LOCK = 0
101 * VID_COUNT = 0x0d2ef8 = 107999.000 * 8 =
102 * ((8 samples/32,000) * (13,500,000 * 8) * 4 - 1) * 8
103 */
104 cx18_av_write4(cx, 0x128, 0xa00d2ef8);
105 break;
106
107 case 44100:
108 /*
109 * VID_PLL Integer = 0x0f, VID_PLL Post Divider = 0x04
110 * AUX_PLL Integer = 0x0e, AUX PLL Post Divider = 0x18
111 */
112 cx18_av_write4(cx, 0x108, 0x180e040f);
113
114 /* VID_PLL Fraction = 0x2be2fe */
115 /* xtal * 0xf.15f17f0/4 = 108 MHz: 432 MHz pre-postdiv*/
116 cx18_av_write4(cx, 0x10c, 0x002be2fe);
117
118 /* AUX_PLL Fraction = 0x062a1f2 */
119 /* xtal * 0xe.3150f90/0x18 = 44100 * 384: 406 MHz p-pd*/
120 cx18_av_write4(cx, 0x110, 0x0062a1f2);
121
122 /* src3/4/6_ctl */
123 /* 0x1.6d59 = (4 * xtal/8*2/455) / 44100 */
124 cx18_av_write4(cx, 0x900, 0x08016d59);
125 cx18_av_write4(cx, 0x904, 0x08016d59);
126 cx18_av_write4(cx, 0x90c, 0x08016d59);
127
128 /* SA_MCLK_SEL=1, SA_MCLK_DIV=0x18 */
129 cx18_av_write(cx, 0x127, 0x58);
130
131 /* AUD_COUNT = 0x92ff = 49 samples * 2 * 384 - 1 */
132 cx18_av_write4(cx, 0x12c, 0x112092ff);
133
134 /*
135 * EN_AV_LOCK = 0
136 * VID_COUNT = 0x1d4bf8 = 239999.000 * 8 =
137 * ((49 samples/44,100) * (13,500,000 * 8) * 2 - 1) * 8
138 */
139 cx18_av_write4(cx, 0x128, 0xa01d4bf8);
140 break;
141
142 case 48000:
143 /*
144 * VID_PLL Integer = 0x0f, VID_PLL Post Divider = 0x04
145 * AUX_PLL Integer = 0x0e, AUX PLL Post Divider = 0x16
146 */
147 cx18_av_write4(cx, 0x108, 0x160e040f);
148
149 /* VID_PLL Fraction = 0x2be2fe */
150 /* xtal * 0xf.15f17f0/4 = 108 MHz: 432 MHz pre-postdiv*/
151 cx18_av_write4(cx, 0x10c, 0x002be2fe);
152
153 /* AUX_PLL Fraction = 0x05227ad */
154 /* xtal * 0xe.2913d68/0x16 = 48000 * 384: 406 MHz p-pd*/
155 cx18_av_write4(cx, 0x110, 0x005227ad);
156
157 /* src3/4/6_ctl */
158 /* 0x1.4faa = (4 * xtal/8*2/455) / 48000 */
159 cx18_av_write4(cx, 0x900, 0x08014faa);
160 cx18_av_write4(cx, 0x904, 0x08014faa);
161 cx18_av_write4(cx, 0x90c, 0x08014faa);
162
163 /* SA_MCLK_SEL=1, SA_MCLK_DIV=0x16 */
164 cx18_av_write(cx, 0x127, 0x56);
165
166 /* AUD_COUNT = 0x5fff = 4 samples * 16 * 384 - 1 */
167 cx18_av_write4(cx, 0x12c, 0x11205fff);
168
169 /*
170 * EN_AV_LOCK = 0
171 * VID_COUNT = 0x1193f8 = 143999.000 * 8 =
172 * ((4 samples/48,000) * (13,500,000 * 8) * 16 - 1) * 8
173 */
174 cx18_av_write4(cx, 0x128, 0xa01193f8);
175 break;
176 }
177 } else {
178 switch (freq) {
179 case 32000:
180 /*
181 * VID_PLL Integer = 0x0f, VID_PLL Post Divider = 0x04
182 * AUX_PLL Integer = 0x0d, AUX PLL Post Divider = 0x30
183 */
184 cx18_av_write4(cx, 0x108, 0x300d040f);
185
186 /* VID_PLL Fraction = 0x2be2fe */
187 /* xtal * 0xf.15f17f0/4 = 108 MHz: 432 MHz pre-postdiv*/
188 cx18_av_write4(cx, 0x10c, 0x002be2fe);
189
190 /* AUX_PLL Fraction = 0x176740c */
191 /* xtal * 0xd.bb3a060/0x30 = 32000 * 256: 393 MHz p-pd*/
192 cx18_av_write4(cx, 0x110, 0x0176740c);
193
194 /* src1_ctl */
195 /* 0x1.0000 = 32000/32000 */
196 cx18_av_write4(cx, 0x8f8, 0x08010000);
197
198 /* src3/4/6_ctl */
199 /* 0x2.0000 = 2 * (32000/32000) */
200 cx18_av_write4(cx, 0x900, 0x08020000);
201 cx18_av_write4(cx, 0x904, 0x08020000);
202 cx18_av_write4(cx, 0x90c, 0x08020000);
203
204 /* SA_MCLK_SEL=1, SA_MCLK_DIV=0x30 */
205 cx18_av_write(cx, 0x127, 0x70);
206
207 /* AUD_COUNT = 0x1fff = 8 samples * 4 * 256 - 1 */
208 cx18_av_write4(cx, 0x12c, 0x11201fff);
209
210 /*
211 * EN_AV_LOCK = 0
212 * VID_COUNT = 0x0d2ef8 = 107999.000 * 8 =
213 * ((8 samples/32,000) * (13,500,000 * 8) * 4 - 1) * 8
214 */
215 cx18_av_write4(cx, 0x128, 0xa00d2ef8);
216 break;
217
218 case 44100:
219 /*
220 * VID_PLL Integer = 0x0f, VID_PLL Post Divider = 0x04
221 * AUX_PLL Integer = 0x0e, AUX PLL Post Divider = 0x24
222 */
223 cx18_av_write4(cx, 0x108, 0x240e040f);
224
225 /* VID_PLL Fraction = 0x2be2fe */
226 /* xtal * 0xf.15f17f0/4 = 108 MHz: 432 MHz pre-postdiv*/
227 cx18_av_write4(cx, 0x10c, 0x002be2fe);
228
229 /* AUX_PLL Fraction = 0x062a1f2 */
230 /* xtal * 0xe.3150f90/0x24 = 44100 * 256: 406 MHz p-pd*/
231 cx18_av_write4(cx, 0x110, 0x0062a1f2);
232
233 /* src1_ctl */
234 /* 0x1.60cd = 44100/32000 */
235 cx18_av_write4(cx, 0x8f8, 0x080160cd);
236
237 /* src3/4/6_ctl */
238 /* 0x1.7385 = 2 * (32000/44100) */
239 cx18_av_write4(cx, 0x900, 0x08017385);
240 cx18_av_write4(cx, 0x904, 0x08017385);
241 cx18_av_write4(cx, 0x90c, 0x08017385);
242
243 /* SA_MCLK_SEL=1, SA_MCLK_DIV=0x24 */
244 cx18_av_write(cx, 0x127, 0x64);
245
246 /* AUD_COUNT = 0x61ff = 49 samples * 2 * 256 - 1 */
247 cx18_av_write4(cx, 0x12c, 0x112061ff);
248
249 /*
250 * EN_AV_LOCK = 0
251 * VID_COUNT = 0x1d4bf8 = 239999.000 * 8 =
252 * ((49 samples/44,100) * (13,500,000 * 8) * 2 - 1) * 8
253 */
254 cx18_av_write4(cx, 0x128, 0xa01d4bf8);
255 break;
256
257 case 48000:
258 /*
259 * VID_PLL Integer = 0x0f, VID_PLL Post Divider = 0x04
260 * AUX_PLL Integer = 0x0d, AUX PLL Post Divider = 0x20
261 */
262 cx18_av_write4(cx, 0x108, 0x200d040f);
263
264 /* VID_PLL Fraction = 0x2be2fe */
265 /* xtal * 0xf.15f17f0/4 = 108 MHz: 432 MHz pre-postdiv*/
266 cx18_av_write4(cx, 0x10c, 0x002be2fe);
267
268 /* AUX_PLL Fraction = 0x176740c */
269 /* xtal * 0xd.bb3a060/0x20 = 48000 * 256: 393 MHz p-pd*/
270 cx18_av_write4(cx, 0x110, 0x0176740c);
271
272 /* src1_ctl */
273 /* 0x1.8000 = 48000/32000 */
274 cx18_av_write4(cx, 0x8f8, 0x08018000);
275
276 /* src3/4/6_ctl */
277 /* 0x1.5555 = 2 * (32000/48000) */
278 cx18_av_write4(cx, 0x900, 0x08015555);
279 cx18_av_write4(cx, 0x904, 0x08015555);
280 cx18_av_write4(cx, 0x90c, 0x08015555);
281
282 /* SA_MCLK_SEL=1, SA_MCLK_DIV=0x20 */
283 cx18_av_write(cx, 0x127, 0x60);
284
285 /* AUD_COUNT = 0x3fff = 4 samples * 16 * 256 - 1 */
286 cx18_av_write4(cx, 0x12c, 0x11203fff);
287
288 /*
289 * EN_AV_LOCK = 0
290 * VID_COUNT = 0x1193f8 = 143999.000 * 8 =
291 * ((4 samples/48,000) * (13,500,000 * 8) * 16 - 1) * 8
292 */
293 cx18_av_write4(cx, 0x128, 0xa01193f8);
294 break;
295 }
296 }
297
298 state->audclk_freq = freq;
299
300 return 0;
301}
302
303void cx18_av_audio_set_path(struct cx18 *cx)
304{
305 struct cx18_av_state *state = &cx->av_state;
306 u8 v;
307
308 /* stop microcontroller */
309 v = cx18_av_read(cx, 0x803) & ~0x10;
310 cx18_av_write_expect(cx, 0x803, v, v, 0x1f);
311
312 /* assert soft reset */
313 v = cx18_av_read(cx, 0x810) | 0x01;
314 cx18_av_write_expect(cx, 0x810, v, v, 0x0f);
315
316 /* Mute everything to prevent the PFFT! */
317 cx18_av_write(cx, 0x8d3, 0x1f);
318
319 if (state->aud_input <= CX18_AV_AUDIO_SERIAL2) {
320 /* Set Path1 to Serial Audio Input */
321 cx18_av_write4(cx, 0x8d0, 0x01011012);
322
323 /* The microcontroller should not be started for the
324 * non-tuner inputs: autodetection is specific for
325 * TV audio. */
326 } else {
327 /* Set Path1 to Analog Demod Main Channel */
328 cx18_av_write4(cx, 0x8d0, 0x1f063870);
329 }
330
331 set_audclk_freq(cx, state->audclk_freq);
332
333 /* deassert soft reset */
334 v = cx18_av_read(cx, 0x810) & ~0x01;
335 cx18_av_write_expect(cx, 0x810, v, v, 0x0f);
336
337 if (state->aud_input > CX18_AV_AUDIO_SERIAL2) {
338 /* When the microcontroller detects the
339 * audio format, it will unmute the lines */
340 v = cx18_av_read(cx, 0x803) | 0x10;
341 cx18_av_write_expect(cx, 0x803, v, v, 0x1f);
342 }
343}
344
345static void set_volume(struct cx18 *cx, int volume)
346{
347 /* First convert the volume to msp3400 values (0-127) */
348 int vol = volume >> 9;
349 /* now scale it up to cx18_av values
350 * -114dB to -96dB maps to 0
351 * this should be 19, but in my testing that was 4dB too loud */
352 if (vol <= 23)
353 vol = 0;
354 else
355 vol -= 23;
356
357 /* PATH1_VOLUME */
358 cx18_av_write(cx, 0x8d4, 228 - (vol * 2));
359}
360
361static void set_bass(struct cx18 *cx, int bass)
362{
363 /* PATH1_EQ_BASS_VOL */
364 cx18_av_and_or(cx, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
365}
366
367static void set_treble(struct cx18 *cx, int treble)
368{
369 /* PATH1_EQ_TREBLE_VOL */
370 cx18_av_and_or(cx, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
371}
372
373static void set_balance(struct cx18 *cx, int balance)
374{
375 int bal = balance >> 8;
376 if (bal > 0x80) {
377 /* PATH1_BAL_LEFT */
378 cx18_av_and_or(cx, 0x8d5, 0x7f, 0x80);
379 /* PATH1_BAL_LEVEL */
380 cx18_av_and_or(cx, 0x8d5, ~0x7f, bal & 0x7f);
381 } else {
382 /* PATH1_BAL_LEFT */
383 cx18_av_and_or(cx, 0x8d5, 0x7f, 0x00);
384 /* PATH1_BAL_LEVEL */
385 cx18_av_and_or(cx, 0x8d5, ~0x7f, 0x80 - bal);
386 }
387}
388
389static void set_mute(struct cx18 *cx, int mute)
390{
391 struct cx18_av_state *state = &cx->av_state;
392 u8 v;
393
394 if (state->aud_input > CX18_AV_AUDIO_SERIAL2) {
395 /* Must turn off microcontroller in order to mute sound.
396 * Not sure if this is the best method, but it does work.
397 * If the microcontroller is running, then it will undo any
398 * changes to the mute register. */
399 v = cx18_av_read(cx, 0x803);
400 if (mute) {
401 /* disable microcontroller */
402 v &= ~0x10;
403 cx18_av_write_expect(cx, 0x803, v, v, 0x1f);
404 cx18_av_write(cx, 0x8d3, 0x1f);
405 } else {
406 /* enable microcontroller */
407 v |= 0x10;
408 cx18_av_write_expect(cx, 0x803, v, v, 0x1f);
409 }
410 } else {
411 /* SRC1_MUTE_EN */
412 cx18_av_and_or(cx, 0x8d3, ~0x2, mute ? 0x02 : 0x00);
413 }
414}
415
416int cx18_av_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
417{
418 struct cx18 *cx = v4l2_get_subdevdata(sd);
419 struct cx18_av_state *state = &cx->av_state;
420 int retval;
421 u8 v;
422
423 if (state->aud_input > CX18_AV_AUDIO_SERIAL2) {
424 v = cx18_av_read(cx, 0x803) & ~0x10;
425 cx18_av_write_expect(cx, 0x803, v, v, 0x1f);
426 cx18_av_write(cx, 0x8d3, 0x1f);
427 }
428 v = cx18_av_read(cx, 0x810) | 0x1;
429 cx18_av_write_expect(cx, 0x810, v, v, 0x0f);
430
431 retval = set_audclk_freq(cx, freq);
432
433 v = cx18_av_read(cx, 0x810) & ~0x1;
434 cx18_av_write_expect(cx, 0x810, v, v, 0x0f);
435 if (state->aud_input > CX18_AV_AUDIO_SERIAL2) {
436 v = cx18_av_read(cx, 0x803) | 0x10;
437 cx18_av_write_expect(cx, 0x803, v, v, 0x1f);
438 }
439 return retval;
440}
441
442static int cx18_av_audio_s_ctrl(struct v4l2_ctrl *ctrl)
443{
444 struct v4l2_subdev *sd = to_sd(ctrl);
445 struct cx18 *cx = v4l2_get_subdevdata(sd);
446
447 switch (ctrl->id) {
448 case V4L2_CID_AUDIO_VOLUME:
449 set_volume(cx, ctrl->val);
450 break;
451 case V4L2_CID_AUDIO_BASS:
452 set_bass(cx, ctrl->val);
453 break;
454 case V4L2_CID_AUDIO_TREBLE:
455 set_treble(cx, ctrl->val);
456 break;
457 case V4L2_CID_AUDIO_BALANCE:
458 set_balance(cx, ctrl->val);
459 break;
460 case V4L2_CID_AUDIO_MUTE:
461 set_mute(cx, ctrl->val);
462 break;
463 default:
464 return -EINVAL;
465 }
466 return 0;
467}
468
469const struct v4l2_ctrl_ops cx18_av_audio_ctrl_ops = {
470 .s_ctrl = cx18_av_audio_s_ctrl,
471};
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-20 21:43:24 -0400