1 /*
2 
3     cx88x-audio.c - Conexant CX23880/23881 audio downstream driver driver
4 
5      (c) 2001 Michael Eskin, Tom Zakrajsek [Windows version]
6      (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
7      (c) 2003 Gerd Knorr <kraxel@bytesex.org>
8 
9     -----------------------------------------------------------------------
10 
11     Lot of voodoo here.  Even the data sheet doesn't help to
12     understand what is going on here, the documentation for the audio
13     part of the cx2388x chip is *very* bad.
14 
15     Some of this comes from party done linux driver sources I got from
16     [undocumented].
17 
18     Some comes from the dscaler sources, one of the dscaler driver guy works
19     for Conexant ...
20 
21     -----------------------------------------------------------------------
22 
23     This program is free software; you can redistribute it and/or modify
24     it under the terms of the GNU General Public License as published by
25     the Free Software Foundation; either version 2 of the License, or
26     (at your option) any later version.
27 
28     This program is distributed in the hope that it will be useful,
29     but WITHOUT ANY WARRANTY; without even the implied warranty of
30     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
31     GNU General Public License for more details.
32 
33     You should have received a copy of the GNU General Public License
34     along with this program; if not, write to the Free Software
35     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
36 */
37 
38 #include <linux/module.h>
39 #include <linux/errno.h>
40 #include <linux/freezer.h>
41 #include <linux/kernel.h>
42 #include <linux/mm.h>
43 #include <linux/poll.h>
44 #include <linux/signal.h>
45 #include <linux/ioport.h>
46 #include <linux/types.h>
47 #include <linux/interrupt.h>
48 #include <linux/vmalloc.h>
49 #include <linux/init.h>
50 #include <linux/delay.h>
51 #include <linux/kthread.h>
52 
53 #include "cx88.h"
54 
55 static unsigned int audio_debug;
56 module_param(audio_debug, int, 0644);
57 MODULE_PARM_DESC(audio_debug, "enable debug messages [audio]");
58 
59 static unsigned int always_analog;
60 module_param(always_analog,int,0644);
61 MODULE_PARM_DESC(always_analog,"force analog audio out");
62 
63 static unsigned int radio_deemphasis;
64 module_param(radio_deemphasis,int,0644);
65 MODULE_PARM_DESC(radio_deemphasis, "Radio deemphasis time constant, "
66 		 "0=None, 1=50us (elsewhere), 2=75us (USA)");
67 
68 #define dprintk(fmt, arg...)	if (audio_debug) \
69 	printk(KERN_DEBUG "%s/0: " fmt, core->name , ## arg)
70 
71 /* ----------------------------------------------------------- */
72 
73 static const char * const aud_ctl_names[64] = {
74 	[EN_BTSC_FORCE_MONO] = "BTSC_FORCE_MONO",
75 	[EN_BTSC_FORCE_STEREO] = "BTSC_FORCE_STEREO",
76 	[EN_BTSC_FORCE_SAP] = "BTSC_FORCE_SAP",
77 	[EN_BTSC_AUTO_STEREO] = "BTSC_AUTO_STEREO",
78 	[EN_BTSC_AUTO_SAP] = "BTSC_AUTO_SAP",
79 	[EN_A2_FORCE_MONO1] = "A2_FORCE_MONO1",
80 	[EN_A2_FORCE_MONO2] = "A2_FORCE_MONO2",
81 	[EN_A2_FORCE_STEREO] = "A2_FORCE_STEREO",
82 	[EN_A2_AUTO_MONO2] = "A2_AUTO_MONO2",
83 	[EN_A2_AUTO_STEREO] = "A2_AUTO_STEREO",
84 	[EN_EIAJ_FORCE_MONO1] = "EIAJ_FORCE_MONO1",
85 	[EN_EIAJ_FORCE_MONO2] = "EIAJ_FORCE_MONO2",
86 	[EN_EIAJ_FORCE_STEREO] = "EIAJ_FORCE_STEREO",
87 	[EN_EIAJ_AUTO_MONO2] = "EIAJ_AUTO_MONO2",
88 	[EN_EIAJ_AUTO_STEREO] = "EIAJ_AUTO_STEREO",
89 	[EN_NICAM_FORCE_MONO1] = "NICAM_FORCE_MONO1",
90 	[EN_NICAM_FORCE_MONO2] = "NICAM_FORCE_MONO2",
91 	[EN_NICAM_FORCE_STEREO] = "NICAM_FORCE_STEREO",
92 	[EN_NICAM_AUTO_MONO2] = "NICAM_AUTO_MONO2",
93 	[EN_NICAM_AUTO_STEREO] = "NICAM_AUTO_STEREO",
94 	[EN_FMRADIO_FORCE_MONO] = "FMRADIO_FORCE_MONO",
95 	[EN_FMRADIO_FORCE_STEREO] = "FMRADIO_FORCE_STEREO",
96 	[EN_FMRADIO_AUTO_STEREO] = "FMRADIO_AUTO_STEREO",
97 };
98 
99 struct rlist {
100 	u32 reg;
101 	u32 val;
102 };
103 
104 static void set_audio_registers(struct cx88_core *core, const struct rlist *l)
105 {
106 	int i;
107 
108 	for (i = 0; l[i].reg; i++) {
109 		switch (l[i].reg) {
110 		case AUD_PDF_DDS_CNST_BYTE2:
111 		case AUD_PDF_DDS_CNST_BYTE1:
112 		case AUD_PDF_DDS_CNST_BYTE0:
113 		case AUD_QAM_MODE:
114 		case AUD_PHACC_FREQ_8MSB:
115 		case AUD_PHACC_FREQ_8LSB:
116 			cx_writeb(l[i].reg, l[i].val);
117 			break;
118 		default:
119 			cx_write(l[i].reg, l[i].val);
120 			break;
121 		}
122 	}
123 }
124 
125 static void set_audio_start(struct cx88_core *core, u32 mode)
126 {
127 	/* mute */
128 	cx_write(AUD_VOL_CTL, (1 << 6));
129 
130 	/* start programming */
131 	cx_write(AUD_INIT, mode);
132 	cx_write(AUD_INIT_LD, 0x0001);
133 	cx_write(AUD_SOFT_RESET, 0x0001);
134 }
135 
136 static void set_audio_finish(struct cx88_core *core, u32 ctl)
137 {
138 	u32 volume;
139 
140 	/* restart dma; This avoids buzz in NICAM and is good in others  */
141 	cx88_stop_audio_dma(core);
142 	cx_write(AUD_RATE_THRES_DMD, 0x000000C0);
143 	cx88_start_audio_dma(core);
144 
145 	if (core->board.mpeg & CX88_MPEG_BLACKBIRD) {
146 		cx_write(AUD_I2SINPUTCNTL, 4);
147 		cx_write(AUD_BAUDRATE, 1);
148 		/* 'pass-thru mode': this enables the i2s output to the mpeg encoder */
149 		cx_set(AUD_CTL, EN_I2SOUT_ENABLE);
150 		cx_write(AUD_I2SOUTPUTCNTL, 1);
151 		cx_write(AUD_I2SCNTL, 0);
152 		/* cx_write(AUD_APB_IN_RATE_ADJ, 0); */
153 	}
154 	if ((always_analog) || (!(core->board.mpeg & CX88_MPEG_BLACKBIRD))) {
155 		ctl |= EN_DAC_ENABLE;
156 		cx_write(AUD_CTL, ctl);
157 	}
158 
159 	/* finish programming */
160 	cx_write(AUD_SOFT_RESET, 0x0000);
161 
162 	/* unmute */
163 	volume = cx_sread(SHADOW_AUD_VOL_CTL);
164 	cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, volume);
165 
166 	core->last_change = jiffies;
167 }
168 
169 /* ----------------------------------------------------------- */
170 
171 static void set_audio_standard_BTSC(struct cx88_core *core, unsigned int sap,
172 				    u32 mode)
173 {
174 	static const struct rlist btsc[] = {
175 		{AUD_AFE_12DB_EN, 0x00000001},
176 		{AUD_OUT1_SEL, 0x00000013},
177 		{AUD_OUT1_SHIFT, 0x00000000},
178 		{AUD_POLY0_DDS_CONSTANT, 0x0012010c},
179 		{AUD_DMD_RA_DDS, 0x00c3e7aa},
180 		{AUD_DBX_IN_GAIN, 0x00004734},
181 		{AUD_DBX_WBE_GAIN, 0x00004640},
182 		{AUD_DBX_SE_GAIN, 0x00008d31},
183 		{AUD_DCOC_0_SRC, 0x0000001a},
184 		{AUD_IIR1_4_SEL, 0x00000021},
185 		{AUD_DCOC_PASS_IN, 0x00000003},
186 		{AUD_DCOC_0_SHIFT_IN0, 0x0000000a},
187 		{AUD_DCOC_0_SHIFT_IN1, 0x00000008},
188 		{AUD_DCOC_1_SHIFT_IN0, 0x0000000a},
189 		{AUD_DCOC_1_SHIFT_IN1, 0x00000008},
190 		{AUD_DN0_FREQ, 0x0000283b},
191 		{AUD_DN2_SRC_SEL, 0x00000008},
192 		{AUD_DN2_FREQ, 0x00003000},
193 		{AUD_DN2_AFC, 0x00000002},
194 		{AUD_DN2_SHFT, 0x00000000},
195 		{AUD_IIR2_2_SEL, 0x00000020},
196 		{AUD_IIR2_2_SHIFT, 0x00000000},
197 		{AUD_IIR2_3_SEL, 0x0000001f},
198 		{AUD_IIR2_3_SHIFT, 0x00000000},
199 		{AUD_CRDC1_SRC_SEL, 0x000003ce},
200 		{AUD_CRDC1_SHIFT, 0x00000000},
201 		{AUD_CORDIC_SHIFT_1, 0x00000007},
202 		{AUD_DCOC_1_SRC, 0x0000001b},
203 		{AUD_DCOC1_SHIFT, 0x00000000},
204 		{AUD_RDSI_SEL, 0x00000008},
205 		{AUD_RDSQ_SEL, 0x00000008},
206 		{AUD_RDSI_SHIFT, 0x00000000},
207 		{AUD_RDSQ_SHIFT, 0x00000000},
208 		{AUD_POLYPH80SCALEFAC, 0x00000003},
209 		{ /* end of list */ },
210 	};
211 	static const struct rlist btsc_sap[] = {
212 		{AUD_AFE_12DB_EN, 0x00000001},
213 		{AUD_DBX_IN_GAIN, 0x00007200},
214 		{AUD_DBX_WBE_GAIN, 0x00006200},
215 		{AUD_DBX_SE_GAIN, 0x00006200},
216 		{AUD_IIR1_1_SEL, 0x00000000},
217 		{AUD_IIR1_3_SEL, 0x00000001},
218 		{AUD_DN1_SRC_SEL, 0x00000007},
219 		{AUD_IIR1_4_SHIFT, 0x00000006},
220 		{AUD_IIR2_1_SHIFT, 0x00000000},
221 		{AUD_IIR2_2_SHIFT, 0x00000000},
222 		{AUD_IIR3_0_SHIFT, 0x00000000},
223 		{AUD_IIR3_1_SHIFT, 0x00000000},
224 		{AUD_IIR3_0_SEL, 0x0000000d},
225 		{AUD_IIR3_1_SEL, 0x0000000e},
226 		{AUD_DEEMPH1_SRC_SEL, 0x00000014},
227 		{AUD_DEEMPH1_SHIFT, 0x00000000},
228 		{AUD_DEEMPH1_G0, 0x00004000},
229 		{AUD_DEEMPH1_A0, 0x00000000},
230 		{AUD_DEEMPH1_B0, 0x00000000},
231 		{AUD_DEEMPH1_A1, 0x00000000},
232 		{AUD_DEEMPH1_B1, 0x00000000},
233 		{AUD_OUT0_SEL, 0x0000003f},
234 		{AUD_OUT1_SEL, 0x0000003f},
235 		{AUD_DN1_AFC, 0x00000002},
236 		{AUD_DCOC_0_SHIFT_IN0, 0x0000000a},
237 		{AUD_DCOC_0_SHIFT_IN1, 0x00000008},
238 		{AUD_DCOC_1_SHIFT_IN0, 0x0000000a},
239 		{AUD_DCOC_1_SHIFT_IN1, 0x00000008},
240 		{AUD_IIR1_0_SEL, 0x0000001d},
241 		{AUD_IIR1_2_SEL, 0x0000001e},
242 		{AUD_IIR2_1_SEL, 0x00000002},
243 		{AUD_IIR2_2_SEL, 0x00000004},
244 		{AUD_IIR3_2_SEL, 0x0000000f},
245 		{AUD_DCOC2_SHIFT, 0x00000001},
246 		{AUD_IIR3_2_SHIFT, 0x00000001},
247 		{AUD_DEEMPH0_SRC_SEL, 0x00000014},
248 		{AUD_CORDIC_SHIFT_1, 0x00000006},
249 		{AUD_POLY0_DDS_CONSTANT, 0x000e4db2},
250 		{AUD_DMD_RA_DDS, 0x00f696e6},
251 		{AUD_IIR2_3_SEL, 0x00000025},
252 		{AUD_IIR1_4_SEL, 0x00000021},
253 		{AUD_DN1_FREQ, 0x0000c965},
254 		{AUD_DCOC_PASS_IN, 0x00000003},
255 		{AUD_DCOC_0_SRC, 0x0000001a},
256 		{AUD_DCOC_1_SRC, 0x0000001b},
257 		{AUD_DCOC1_SHIFT, 0x00000000},
258 		{AUD_RDSI_SEL, 0x00000009},
259 		{AUD_RDSQ_SEL, 0x00000009},
260 		{AUD_RDSI_SHIFT, 0x00000000},
261 		{AUD_RDSQ_SHIFT, 0x00000000},
262 		{AUD_POLYPH80SCALEFAC, 0x00000003},
263 		{ /* end of list */ },
264 	};
265 
266 	mode |= EN_FMRADIO_EN_RDS;
267 
268 	if (sap) {
269 		dprintk("%s SAP (status: unknown)\n", __func__);
270 		set_audio_start(core, SEL_SAP);
271 		set_audio_registers(core, btsc_sap);
272 		set_audio_finish(core, mode);
273 	} else {
274 		dprintk("%s (status: known-good)\n", __func__);
275 		set_audio_start(core, SEL_BTSC);
276 		set_audio_registers(core, btsc);
277 		set_audio_finish(core, mode);
278 	}
279 }
280 
281 static void set_audio_standard_NICAM(struct cx88_core *core, u32 mode)
282 {
283 	static const struct rlist nicam_l[] = {
284 		{AUD_AFE_12DB_EN, 0x00000001},
285 		{AUD_RATE_ADJ1, 0x00000060},
286 		{AUD_RATE_ADJ2, 0x000000F9},
287 		{AUD_RATE_ADJ3, 0x000001CC},
288 		{AUD_RATE_ADJ4, 0x000002B3},
289 		{AUD_RATE_ADJ5, 0x00000726},
290 		{AUD_DEEMPHDENOM1_R, 0x0000F3D0},
291 		{AUD_DEEMPHDENOM2_R, 0x00000000},
292 		{AUD_ERRLOGPERIOD_R, 0x00000064},
293 		{AUD_ERRINTRPTTHSHLD1_R, 0x00000FFF},
294 		{AUD_ERRINTRPTTHSHLD2_R, 0x0000001F},
295 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000000F},
296 		{AUD_POLYPH80SCALEFAC, 0x00000003},
297 		{AUD_DMD_RA_DDS, 0x00C00000},
298 		{AUD_PLL_INT, 0x0000001E},
299 		{AUD_PLL_DDS, 0x00000000},
300 		{AUD_PLL_FRAC, 0x0000E542},
301 		{AUD_START_TIMER, 0x00000000},
302 		{AUD_DEEMPHNUMER1_R, 0x000353DE},
303 		{AUD_DEEMPHNUMER2_R, 0x000001B1},
304 		{AUD_PDF_DDS_CNST_BYTE2, 0x06},
305 		{AUD_PDF_DDS_CNST_BYTE1, 0x82},
306 		{AUD_PDF_DDS_CNST_BYTE0, 0x12},
307 		{AUD_QAM_MODE, 0x05},
308 		{AUD_PHACC_FREQ_8MSB, 0x34},
309 		{AUD_PHACC_FREQ_8LSB, 0x4C},
310 		{AUD_DEEMPHGAIN_R, 0x00006680},
311 		{AUD_RATE_THRES_DMD, 0x000000C0},
312 		{ /* end of list */ },
313 	};
314 
315 	static const struct rlist nicam_bgdki_common[] = {
316 		{AUD_AFE_12DB_EN, 0x00000001},
317 		{AUD_RATE_ADJ1, 0x00000010},
318 		{AUD_RATE_ADJ2, 0x00000040},
319 		{AUD_RATE_ADJ3, 0x00000100},
320 		{AUD_RATE_ADJ4, 0x00000400},
321 		{AUD_RATE_ADJ5, 0x00001000},
322 		{AUD_ERRLOGPERIOD_R, 0x00000fff},
323 		{AUD_ERRINTRPTTHSHLD1_R, 0x000003ff},
324 		{AUD_ERRINTRPTTHSHLD2_R, 0x000000ff},
325 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000003f},
326 		{AUD_POLYPH80SCALEFAC, 0x00000003},
327 		{AUD_DEEMPHGAIN_R, 0x000023c2},
328 		{AUD_DEEMPHNUMER1_R, 0x0002a7bc},
329 		{AUD_DEEMPHNUMER2_R, 0x0003023e},
330 		{AUD_DEEMPHDENOM1_R, 0x0000f3d0},
331 		{AUD_DEEMPHDENOM2_R, 0x00000000},
332 		{AUD_PDF_DDS_CNST_BYTE2, 0x06},
333 		{AUD_PDF_DDS_CNST_BYTE1, 0x82},
334 		{AUD_QAM_MODE, 0x05},
335 		{ /* end of list */ },
336 	};
337 
338 	static const struct rlist nicam_i[] = {
339 		{AUD_PDF_DDS_CNST_BYTE0, 0x12},
340 		{AUD_PHACC_FREQ_8MSB, 0x3a},
341 		{AUD_PHACC_FREQ_8LSB, 0x93},
342 		{ /* end of list */ },
343 	};
344 
345 	static const struct rlist nicam_default[] = {
346 		{AUD_PDF_DDS_CNST_BYTE0, 0x16},
347 		{AUD_PHACC_FREQ_8MSB, 0x34},
348 		{AUD_PHACC_FREQ_8LSB, 0x4c},
349 		{ /* end of list */ },
350 	};
351 
352 	set_audio_start(core,SEL_NICAM);
353 	switch (core->tvaudio) {
354 	case WW_L:
355 		dprintk("%s SECAM-L NICAM (status: devel)\n", __func__);
356 		set_audio_registers(core, nicam_l);
357 		break;
358 	case WW_I:
359 		dprintk("%s PAL-I NICAM (status: known-good)\n", __func__);
360 		set_audio_registers(core, nicam_bgdki_common);
361 		set_audio_registers(core, nicam_i);
362 		break;
363 	case WW_NONE:
364 	case WW_BTSC:
365 	case WW_BG:
366 	case WW_DK:
367 	case WW_EIAJ:
368 	case WW_I2SPT:
369 	case WW_FM:
370 	case WW_I2SADC:
371 	case WW_M:
372 		dprintk("%s PAL-BGDK NICAM (status: known-good)\n", __func__);
373 		set_audio_registers(core, nicam_bgdki_common);
374 		set_audio_registers(core, nicam_default);
375 		break;
376 	}
377 
378 	mode |= EN_DMTRX_LR | EN_DMTRX_BYPASS;
379 	set_audio_finish(core, mode);
380 }
381 
382 static void set_audio_standard_A2(struct cx88_core *core, u32 mode)
383 {
384 	static const struct rlist a2_bgdk_common[] = {
385 		{AUD_ERRLOGPERIOD_R, 0x00000064},
386 		{AUD_ERRINTRPTTHSHLD1_R, 0x00000fff},
387 		{AUD_ERRINTRPTTHSHLD2_R, 0x0000001f},
388 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000000f},
389 		{AUD_PDF_DDS_CNST_BYTE2, 0x06},
390 		{AUD_PDF_DDS_CNST_BYTE1, 0x82},
391 		{AUD_PDF_DDS_CNST_BYTE0, 0x12},
392 		{AUD_QAM_MODE, 0x05},
393 		{AUD_PHACC_FREQ_8MSB, 0x34},
394 		{AUD_PHACC_FREQ_8LSB, 0x4c},
395 		{AUD_RATE_ADJ1, 0x00000100},
396 		{AUD_RATE_ADJ2, 0x00000200},
397 		{AUD_RATE_ADJ3, 0x00000300},
398 		{AUD_RATE_ADJ4, 0x00000400},
399 		{AUD_RATE_ADJ5, 0x00000500},
400 		{AUD_THR_FR, 0x00000000},
401 		{AAGC_HYST, 0x0000001a},
402 		{AUD_PILOT_BQD_1_K0, 0x0000755b},
403 		{AUD_PILOT_BQD_1_K1, 0x00551340},
404 		{AUD_PILOT_BQD_1_K2, 0x006d30be},
405 		{AUD_PILOT_BQD_1_K3, 0xffd394af},
406 		{AUD_PILOT_BQD_1_K4, 0x00400000},
407 		{AUD_PILOT_BQD_2_K0, 0x00040000},
408 		{AUD_PILOT_BQD_2_K1, 0x002a4841},
409 		{AUD_PILOT_BQD_2_K2, 0x00400000},
410 		{AUD_PILOT_BQD_2_K3, 0x00000000},
411 		{AUD_PILOT_BQD_2_K4, 0x00000000},
412 		{AUD_MODE_CHG_TIMER, 0x00000040},
413 		{AUD_AFE_12DB_EN, 0x00000001},
414 		{AUD_CORDIC_SHIFT_0, 0x00000007},
415 		{AUD_CORDIC_SHIFT_1, 0x00000007},
416 		{AUD_DEEMPH0_G0, 0x00000380},
417 		{AUD_DEEMPH1_G0, 0x00000380},
418 		{AUD_DCOC_0_SRC, 0x0000001a},
419 		{AUD_DCOC0_SHIFT, 0x00000000},
420 		{AUD_DCOC_0_SHIFT_IN0, 0x0000000a},
421 		{AUD_DCOC_0_SHIFT_IN1, 0x00000008},
422 		{AUD_DCOC_PASS_IN, 0x00000003},
423 		{AUD_IIR3_0_SEL, 0x00000021},
424 		{AUD_DN2_AFC, 0x00000002},
425 		{AUD_DCOC_1_SRC, 0x0000001b},
426 		{AUD_DCOC1_SHIFT, 0x00000000},
427 		{AUD_DCOC_1_SHIFT_IN0, 0x0000000a},
428 		{AUD_DCOC_1_SHIFT_IN1, 0x00000008},
429 		{AUD_IIR3_1_SEL, 0x00000023},
430 		{AUD_RDSI_SEL, 0x00000017},
431 		{AUD_RDSI_SHIFT, 0x00000000},
432 		{AUD_RDSQ_SEL, 0x00000017},
433 		{AUD_RDSQ_SHIFT, 0x00000000},
434 		{AUD_PLL_INT, 0x0000001e},
435 		{AUD_PLL_DDS, 0x00000000},
436 		{AUD_PLL_FRAC, 0x0000e542},
437 		{AUD_POLYPH80SCALEFAC, 0x00000001},
438 		{AUD_START_TIMER, 0x00000000},
439 		{ /* end of list */ },
440 	};
441 
442 	static const struct rlist a2_bg[] = {
443 		{AUD_DMD_RA_DDS, 0x002a4f2f},
444 		{AUD_C1_UP_THR, 0x00007000},
445 		{AUD_C1_LO_THR, 0x00005400},
446 		{AUD_C2_UP_THR, 0x00005400},
447 		{AUD_C2_LO_THR, 0x00003000},
448 		{ /* end of list */ },
449 	};
450 
451 	static const struct rlist a2_dk[] = {
452 		{AUD_DMD_RA_DDS, 0x002a4f2f},
453 		{AUD_C1_UP_THR, 0x00007000},
454 		{AUD_C1_LO_THR, 0x00005400},
455 		{AUD_C2_UP_THR, 0x00005400},
456 		{AUD_C2_LO_THR, 0x00003000},
457 		{AUD_DN0_FREQ, 0x00003a1c},
458 		{AUD_DN2_FREQ, 0x0000d2e0},
459 		{ /* end of list */ },
460 	};
461 
462 	static const struct rlist a1_i[] = {
463 		{AUD_ERRLOGPERIOD_R, 0x00000064},
464 		{AUD_ERRINTRPTTHSHLD1_R, 0x00000fff},
465 		{AUD_ERRINTRPTTHSHLD2_R, 0x0000001f},
466 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000000f},
467 		{AUD_PDF_DDS_CNST_BYTE2, 0x06},
468 		{AUD_PDF_DDS_CNST_BYTE1, 0x82},
469 		{AUD_PDF_DDS_CNST_BYTE0, 0x12},
470 		{AUD_QAM_MODE, 0x05},
471 		{AUD_PHACC_FREQ_8MSB, 0x3a},
472 		{AUD_PHACC_FREQ_8LSB, 0x93},
473 		{AUD_DMD_RA_DDS, 0x002a4f2f},
474 		{AUD_PLL_INT, 0x0000001e},
475 		{AUD_PLL_DDS, 0x00000004},
476 		{AUD_PLL_FRAC, 0x0000e542},
477 		{AUD_RATE_ADJ1, 0x00000100},
478 		{AUD_RATE_ADJ2, 0x00000200},
479 		{AUD_RATE_ADJ3, 0x00000300},
480 		{AUD_RATE_ADJ4, 0x00000400},
481 		{AUD_RATE_ADJ5, 0x00000500},
482 		{AUD_THR_FR, 0x00000000},
483 		{AUD_PILOT_BQD_1_K0, 0x0000755b},
484 		{AUD_PILOT_BQD_1_K1, 0x00551340},
485 		{AUD_PILOT_BQD_1_K2, 0x006d30be},
486 		{AUD_PILOT_BQD_1_K3, 0xffd394af},
487 		{AUD_PILOT_BQD_1_K4, 0x00400000},
488 		{AUD_PILOT_BQD_2_K0, 0x00040000},
489 		{AUD_PILOT_BQD_2_K1, 0x002a4841},
490 		{AUD_PILOT_BQD_2_K2, 0x00400000},
491 		{AUD_PILOT_BQD_2_K3, 0x00000000},
492 		{AUD_PILOT_BQD_2_K4, 0x00000000},
493 		{AUD_MODE_CHG_TIMER, 0x00000060},
494 		{AUD_AFE_12DB_EN, 0x00000001},
495 		{AAGC_HYST, 0x0000000a},
496 		{AUD_CORDIC_SHIFT_0, 0x00000007},
497 		{AUD_CORDIC_SHIFT_1, 0x00000007},
498 		{AUD_C1_UP_THR, 0x00007000},
499 		{AUD_C1_LO_THR, 0x00005400},
500 		{AUD_C2_UP_THR, 0x00005400},
501 		{AUD_C2_LO_THR, 0x00003000},
502 		{AUD_DCOC_0_SRC, 0x0000001a},
503 		{AUD_DCOC0_SHIFT, 0x00000000},
504 		{AUD_DCOC_0_SHIFT_IN0, 0x0000000a},
505 		{AUD_DCOC_0_SHIFT_IN1, 0x00000008},
506 		{AUD_DCOC_PASS_IN, 0x00000003},
507 		{AUD_IIR3_0_SEL, 0x00000021},
508 		{AUD_DN2_AFC, 0x00000002},
509 		{AUD_DCOC_1_SRC, 0x0000001b},
510 		{AUD_DCOC1_SHIFT, 0x00000000},
511 		{AUD_DCOC_1_SHIFT_IN0, 0x0000000a},
512 		{AUD_DCOC_1_SHIFT_IN1, 0x00000008},
513 		{AUD_IIR3_1_SEL, 0x00000023},
514 		{AUD_DN0_FREQ, 0x000035a3},
515 		{AUD_DN2_FREQ, 0x000029c7},
516 		{AUD_CRDC0_SRC_SEL, 0x00000511},
517 		{AUD_IIR1_0_SEL, 0x00000001},
518 		{AUD_IIR1_1_SEL, 0x00000000},
519 		{AUD_IIR3_2_SEL, 0x00000003},
520 		{AUD_IIR3_2_SHIFT, 0x00000000},
521 		{AUD_IIR3_0_SEL, 0x00000002},
522 		{AUD_IIR2_0_SEL, 0x00000021},
523 		{AUD_IIR2_0_SHIFT, 0x00000002},
524 		{AUD_DEEMPH0_SRC_SEL, 0x0000000b},
525 		{AUD_DEEMPH1_SRC_SEL, 0x0000000b},
526 		{AUD_POLYPH80SCALEFAC, 0x00000001},
527 		{AUD_START_TIMER, 0x00000000},
528 		{ /* end of list */ },
529 	};
530 
531 	static const struct rlist am_l[] = {
532 		{AUD_ERRLOGPERIOD_R, 0x00000064},
533 		{AUD_ERRINTRPTTHSHLD1_R, 0x00000FFF},
534 		{AUD_ERRINTRPTTHSHLD2_R, 0x0000001F},
535 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000000F},
536 		{AUD_PDF_DDS_CNST_BYTE2, 0x48},
537 		{AUD_PDF_DDS_CNST_BYTE1, 0x3D},
538 		{AUD_QAM_MODE, 0x00},
539 		{AUD_PDF_DDS_CNST_BYTE0, 0xf5},
540 		{AUD_PHACC_FREQ_8MSB, 0x3a},
541 		{AUD_PHACC_FREQ_8LSB, 0x4a},
542 		{AUD_DEEMPHGAIN_R, 0x00006680},
543 		{AUD_DEEMPHNUMER1_R, 0x000353DE},
544 		{AUD_DEEMPHNUMER2_R, 0x000001B1},
545 		{AUD_DEEMPHDENOM1_R, 0x0000F3D0},
546 		{AUD_DEEMPHDENOM2_R, 0x00000000},
547 		{AUD_FM_MODE_ENABLE, 0x00000007},
548 		{AUD_POLYPH80SCALEFAC, 0x00000003},
549 		{AUD_AFE_12DB_EN, 0x00000001},
550 		{AAGC_GAIN, 0x00000000},
551 		{AAGC_HYST, 0x00000018},
552 		{AAGC_DEF, 0x00000020},
553 		{AUD_DN0_FREQ, 0x00000000},
554 		{AUD_POLY0_DDS_CONSTANT, 0x000E4DB2},
555 		{AUD_DCOC_0_SRC, 0x00000021},
556 		{AUD_IIR1_0_SEL, 0x00000000},
557 		{AUD_IIR1_0_SHIFT, 0x00000007},
558 		{AUD_IIR1_1_SEL, 0x00000002},
559 		{AUD_IIR1_1_SHIFT, 0x00000000},
560 		{AUD_DCOC_1_SRC, 0x00000003},
561 		{AUD_DCOC1_SHIFT, 0x00000000},
562 		{AUD_DCOC_PASS_IN, 0x00000000},
563 		{AUD_IIR1_2_SEL, 0x00000023},
564 		{AUD_IIR1_2_SHIFT, 0x00000000},
565 		{AUD_IIR1_3_SEL, 0x00000004},
566 		{AUD_IIR1_3_SHIFT, 0x00000007},
567 		{AUD_IIR1_4_SEL, 0x00000005},
568 		{AUD_IIR1_4_SHIFT, 0x00000007},
569 		{AUD_IIR3_0_SEL, 0x00000007},
570 		{AUD_IIR3_0_SHIFT, 0x00000000},
571 		{AUD_DEEMPH0_SRC_SEL, 0x00000011},
572 		{AUD_DEEMPH0_SHIFT, 0x00000000},
573 		{AUD_DEEMPH0_G0, 0x00007000},
574 		{AUD_DEEMPH0_A0, 0x00000000},
575 		{AUD_DEEMPH0_B0, 0x00000000},
576 		{AUD_DEEMPH0_A1, 0x00000000},
577 		{AUD_DEEMPH0_B1, 0x00000000},
578 		{AUD_DEEMPH1_SRC_SEL, 0x00000011},
579 		{AUD_DEEMPH1_SHIFT, 0x00000000},
580 		{AUD_DEEMPH1_G0, 0x00007000},
581 		{AUD_DEEMPH1_A0, 0x00000000},
582 		{AUD_DEEMPH1_B0, 0x00000000},
583 		{AUD_DEEMPH1_A1, 0x00000000},
584 		{AUD_DEEMPH1_B1, 0x00000000},
585 		{AUD_OUT0_SEL, 0x0000003F},
586 		{AUD_OUT1_SEL, 0x0000003F},
587 		{AUD_DMD_RA_DDS, 0x00F5C285},
588 		{AUD_PLL_INT, 0x0000001E},
589 		{AUD_PLL_DDS, 0x00000000},
590 		{AUD_PLL_FRAC, 0x0000E542},
591 		{AUD_RATE_ADJ1, 0x00000100},
592 		{AUD_RATE_ADJ2, 0x00000200},
593 		{AUD_RATE_ADJ3, 0x00000300},
594 		{AUD_RATE_ADJ4, 0x00000400},
595 		{AUD_RATE_ADJ5, 0x00000500},
596 		{AUD_RATE_THRES_DMD, 0x000000C0},
597 		{ /* end of list */ },
598 	};
599 
600 	static const struct rlist a2_deemph50[] = {
601 		{AUD_DEEMPH0_G0, 0x00000380},
602 		{AUD_DEEMPH1_G0, 0x00000380},
603 		{AUD_DEEMPHGAIN_R, 0x000011e1},
604 		{AUD_DEEMPHNUMER1_R, 0x0002a7bc},
605 		{AUD_DEEMPHNUMER2_R, 0x0003023c},
606 		{ /* end of list */ },
607 	};
608 
609 	set_audio_start(core, SEL_A2);
610 	switch (core->tvaudio) {
611 	case WW_BG:
612 		dprintk("%s PAL-BG A1/2 (status: known-good)\n", __func__);
613 		set_audio_registers(core, a2_bgdk_common);
614 		set_audio_registers(core, a2_bg);
615 		set_audio_registers(core, a2_deemph50);
616 		break;
617 	case WW_DK:
618 		dprintk("%s PAL-DK A1/2 (status: known-good)\n", __func__);
619 		set_audio_registers(core, a2_bgdk_common);
620 		set_audio_registers(core, a2_dk);
621 		set_audio_registers(core, a2_deemph50);
622 		break;
623 	case WW_I:
624 		dprintk("%s PAL-I A1 (status: known-good)\n", __func__);
625 		set_audio_registers(core, a1_i);
626 		set_audio_registers(core, a2_deemph50);
627 		break;
628 	case WW_L:
629 		dprintk("%s AM-L (status: devel)\n", __func__);
630 		set_audio_registers(core, am_l);
631 		break;
632 	case WW_NONE:
633 	case WW_BTSC:
634 	case WW_EIAJ:
635 	case WW_I2SPT:
636 	case WW_FM:
637 	case WW_I2SADC:
638 	case WW_M:
639 		dprintk("%s Warning: wrong value\n", __func__);
640 		return;
641 		break;
642 	}
643 
644 	mode |= EN_FMRADIO_EN_RDS | EN_DMTRX_SUMDIFF;
645 	set_audio_finish(core, mode);
646 }
647 
648 static void set_audio_standard_EIAJ(struct cx88_core *core)
649 {
650 	static const struct rlist eiaj[] = {
651 		/* TODO: eiaj register settings are not there yet ... */
652 
653 		{ /* end of list */ },
654 	};
655 	dprintk("%s (status: unknown)\n", __func__);
656 
657 	set_audio_start(core, SEL_EIAJ);
658 	set_audio_registers(core, eiaj);
659 	set_audio_finish(core, EN_EIAJ_AUTO_STEREO);
660 }
661 
662 static void set_audio_standard_FM(struct cx88_core *core,
663 				  enum cx88_deemph_type deemph)
664 {
665 	static const struct rlist fm_deemph_50[] = {
666 		{AUD_DEEMPH0_G0, 0x0C45},
667 		{AUD_DEEMPH0_A0, 0x6262},
668 		{AUD_DEEMPH0_B0, 0x1C29},
669 		{AUD_DEEMPH0_A1, 0x3FC66},
670 		{AUD_DEEMPH0_B1, 0x399A},
671 
672 		{AUD_DEEMPH1_G0, 0x0D80},
673 		{AUD_DEEMPH1_A0, 0x6262},
674 		{AUD_DEEMPH1_B0, 0x1C29},
675 		{AUD_DEEMPH1_A1, 0x3FC66},
676 		{AUD_DEEMPH1_B1, 0x399A},
677 
678 		{AUD_POLYPH80SCALEFAC, 0x0003},
679 		{ /* end of list */ },
680 	};
681 	static const struct rlist fm_deemph_75[] = {
682 		{AUD_DEEMPH0_G0, 0x091B},
683 		{AUD_DEEMPH0_A0, 0x6B68},
684 		{AUD_DEEMPH0_B0, 0x11EC},
685 		{AUD_DEEMPH0_A1, 0x3FC66},
686 		{AUD_DEEMPH0_B1, 0x399A},
687 
688 		{AUD_DEEMPH1_G0, 0x0AA0},
689 		{AUD_DEEMPH1_A0, 0x6B68},
690 		{AUD_DEEMPH1_B0, 0x11EC},
691 		{AUD_DEEMPH1_A1, 0x3FC66},
692 		{AUD_DEEMPH1_B1, 0x399A},
693 
694 		{AUD_POLYPH80SCALEFAC, 0x0003},
695 		{ /* end of list */ },
696 	};
697 
698 	/* It is enough to leave default values? */
699 	/* No, it's not!  The deemphasis registers are reset to the 75us
700 	 * values by default.  Analyzing the spectrum of the decoded audio
701 	 * reveals that "no deemphasis" is the same as 75 us, while the 50 us
702 	 * setting results in less deemphasis.  */
703 	static const struct rlist fm_no_deemph[] = {
704 
705 		{AUD_POLYPH80SCALEFAC, 0x0003},
706 		{ /* end of list */ },
707 	};
708 
709 	dprintk("%s (status: unknown)\n", __func__);
710 	set_audio_start(core, SEL_FMRADIO);
711 
712 	switch (deemph) {
713 	default:
714 	case FM_NO_DEEMPH:
715 		set_audio_registers(core, fm_no_deemph);
716 		break;
717 
718 	case FM_DEEMPH_50:
719 		set_audio_registers(core, fm_deemph_50);
720 		break;
721 
722 	case FM_DEEMPH_75:
723 		set_audio_registers(core, fm_deemph_75);
724 		break;
725 	}
726 
727 	set_audio_finish(core, EN_FMRADIO_AUTO_STEREO);
728 }
729 
730 /* ----------------------------------------------------------- */
731 
732 static int cx88_detect_nicam(struct cx88_core *core)
733 {
734 	int i, j = 0;
735 
736 	dprintk("start nicam autodetect.\n");
737 
738 	for (i = 0; i < 6; i++) {
739 		/* if bit1=1 then nicam is detected */
740 		j += ((cx_read(AUD_NICAM_STATUS2) & 0x02) >> 1);
741 
742 		if (j == 1) {
743 			dprintk("nicam is detected.\n");
744 			return 1;
745 		}
746 
747 		/* wait a little bit for next reading status */
748 		msleep(10);
749 	}
750 
751 	dprintk("nicam is not detected.\n");
752 	return 0;
753 }
754 
755 void cx88_set_tvaudio(struct cx88_core *core)
756 {
757 	switch (core->tvaudio) {
758 	case WW_BTSC:
759 		set_audio_standard_BTSC(core, 0, EN_BTSC_AUTO_STEREO);
760 		break;
761 	case WW_BG:
762 	case WW_DK:
763 	case WW_M:
764 	case WW_I:
765 	case WW_L:
766 		/* prepare all dsp registers */
767 		set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
768 
769 		/* set nicam mode - otherwise
770 		   AUD_NICAM_STATUS2 contains wrong values */
771 		set_audio_standard_NICAM(core, EN_NICAM_AUTO_STEREO);
772 		if (0 == cx88_detect_nicam(core)) {
773 			/* fall back to fm / am mono */
774 			set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
775 			core->audiomode_current = V4L2_TUNER_MODE_MONO;
776 			core->use_nicam = 0;
777 		} else {
778 			core->use_nicam = 1;
779 		}
780 		break;
781 	case WW_EIAJ:
782 		set_audio_standard_EIAJ(core);
783 		break;
784 	case WW_FM:
785 		set_audio_standard_FM(core, radio_deemphasis);
786 		break;
787 	case WW_I2SADC:
788 		set_audio_start(core, 0x01);
789 		/*
790 		 * Slave/Philips/Autobaud
791 		 * NB on Nova-S bit1 NPhilipsSony appears to be inverted:
792 		 *	0= Sony, 1=Philips
793 		 */
794 		cx_write(AUD_I2SINPUTCNTL, core->board.i2sinputcntl);
795 		/* Switch to "I2S ADC mode" */
796 		cx_write(AUD_I2SCNTL, 0x1);
797 		set_audio_finish(core, EN_I2SIN_ENABLE);
798 		break;
799 	case WW_NONE:
800 	case WW_I2SPT:
801 		printk("%s/0: unknown tv audio mode [%d]\n",
802 		       core->name, core->tvaudio);
803 		break;
804 	}
805 	return;
806 }
807 
808 void cx88_newstation(struct cx88_core *core)
809 {
810 	core->audiomode_manual = UNSET;
811 	core->last_change = jiffies;
812 }
813 
814 void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t)
815 {
816 	static const char * const m[] = { "stereo", "dual mono", "mono", "sap" };
817 	static const char * const p[] = { "no pilot", "pilot c1", "pilot c2", "?" };
818 	u32 reg, mode, pilot;
819 
820 	reg = cx_read(AUD_STATUS);
821 	mode = reg & 0x03;
822 	pilot = (reg >> 2) & 0x03;
823 
824 	if (core->astat != reg)
825 		dprintk("AUD_STATUS: 0x%x [%s/%s] ctl=%s\n",
826 			reg, m[mode], p[pilot],
827 			aud_ctl_names[cx_read(AUD_CTL) & 63]);
828 	core->astat = reg;
829 
830 	t->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_SAP |
831 	    V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
832 	t->rxsubchans = UNSET;
833 	t->audmode = V4L2_TUNER_MODE_MONO;
834 
835 	switch (mode) {
836 	case 0:
837 		t->audmode = V4L2_TUNER_MODE_STEREO;
838 		break;
839 	case 1:
840 		t->audmode = V4L2_TUNER_MODE_LANG2;
841 		break;
842 	case 2:
843 		t->audmode = V4L2_TUNER_MODE_MONO;
844 		break;
845 	case 3:
846 		t->audmode = V4L2_TUNER_MODE_SAP;
847 		break;
848 	}
849 
850 	switch (core->tvaudio) {
851 	case WW_BTSC:
852 	case WW_BG:
853 	case WW_DK:
854 	case WW_M:
855 	case WW_EIAJ:
856 		if (!core->use_nicam) {
857 			t->rxsubchans = cx88_dsp_detect_stereo_sap(core);
858 			break;
859 		}
860 		break;
861 	case WW_NONE:
862 	case WW_I:
863 	case WW_L:
864 	case WW_I2SPT:
865 	case WW_FM:
866 	case WW_I2SADC:
867 		/* nothing */
868 		break;
869 	}
870 
871 	/* If software stereo detection is not supported... */
872 	if (UNSET == t->rxsubchans) {
873 		t->rxsubchans = V4L2_TUNER_SUB_MONO;
874 		/* If the hardware itself detected stereo, also return
875 		   stereo as an available subchannel */
876 		if (V4L2_TUNER_MODE_STEREO == t->audmode)
877 			t->rxsubchans |= V4L2_TUNER_SUB_STEREO;
878 	}
879 	return;
880 }
881 
882 void cx88_set_stereo(struct cx88_core *core, u32 mode, int manual)
883 {
884 	u32 ctl = UNSET;
885 	u32 mask = UNSET;
886 
887 	if (manual) {
888 		core->audiomode_manual = mode;
889 	} else {
890 		if (UNSET != core->audiomode_manual)
891 			return;
892 	}
893 	core->audiomode_current = mode;
894 
895 	switch (core->tvaudio) {
896 	case WW_BTSC:
897 		switch (mode) {
898 		case V4L2_TUNER_MODE_MONO:
899 			set_audio_standard_BTSC(core, 0, EN_BTSC_FORCE_MONO);
900 			break;
901 		case V4L2_TUNER_MODE_LANG1:
902 			set_audio_standard_BTSC(core, 0, EN_BTSC_AUTO_STEREO);
903 			break;
904 		case V4L2_TUNER_MODE_LANG2:
905 			set_audio_standard_BTSC(core, 1, EN_BTSC_FORCE_SAP);
906 			break;
907 		case V4L2_TUNER_MODE_STEREO:
908 		case V4L2_TUNER_MODE_LANG1_LANG2:
909 			set_audio_standard_BTSC(core, 0, EN_BTSC_FORCE_STEREO);
910 			break;
911 		}
912 		break;
913 	case WW_BG:
914 	case WW_DK:
915 	case WW_M:
916 	case WW_I:
917 	case WW_L:
918 		if (1 == core->use_nicam) {
919 			switch (mode) {
920 			case V4L2_TUNER_MODE_MONO:
921 			case V4L2_TUNER_MODE_LANG1:
922 				set_audio_standard_NICAM(core,
923 							 EN_NICAM_FORCE_MONO1);
924 				break;
925 			case V4L2_TUNER_MODE_LANG2:
926 				set_audio_standard_NICAM(core,
927 							 EN_NICAM_FORCE_MONO2);
928 				break;
929 			case V4L2_TUNER_MODE_STEREO:
930 			case V4L2_TUNER_MODE_LANG1_LANG2:
931 				set_audio_standard_NICAM(core,
932 							 EN_NICAM_FORCE_STEREO);
933 				break;
934 			}
935 		} else {
936 			if ((core->tvaudio == WW_I) || (core->tvaudio == WW_L)) {
937 				/* fall back to fm / am mono */
938 				set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
939 			} else {
940 				/* TODO: Add A2 autodection */
941 				mask = 0x3f;
942 				switch (mode) {
943 				case V4L2_TUNER_MODE_MONO:
944 				case V4L2_TUNER_MODE_LANG1:
945 					ctl = EN_A2_FORCE_MONO1;
946 					break;
947 				case V4L2_TUNER_MODE_LANG2:
948 					ctl = EN_A2_FORCE_MONO2;
949 					break;
950 				case V4L2_TUNER_MODE_STEREO:
951 				case V4L2_TUNER_MODE_LANG1_LANG2:
952 					ctl = EN_A2_FORCE_STEREO;
953 					break;
954 				}
955 			}
956 		}
957 		break;
958 	case WW_FM:
959 		switch (mode) {
960 		case V4L2_TUNER_MODE_MONO:
961 			ctl = EN_FMRADIO_FORCE_MONO;
962 			mask = 0x3f;
963 			break;
964 		case V4L2_TUNER_MODE_STEREO:
965 			ctl = EN_FMRADIO_AUTO_STEREO;
966 			mask = 0x3f;
967 			break;
968 		}
969 		break;
970 	case WW_I2SADC:
971 	case WW_NONE:
972 	case WW_EIAJ:
973 	case WW_I2SPT:
974 		/* DO NOTHING */
975 		break;
976 	}
977 
978 	if (UNSET != ctl) {
979 		dprintk("cx88_set_stereo: mask 0x%x, ctl 0x%x "
980 			"[status=0x%x,ctl=0x%x,vol=0x%x]\n",
981 			mask, ctl, cx_read(AUD_STATUS),
982 			cx_read(AUD_CTL), cx_sread(SHADOW_AUD_VOL_CTL));
983 		cx_andor(AUD_CTL, mask, ctl);
984 	}
985 	return;
986 }
987 
988 int cx88_audio_thread(void *data)
989 {
990 	struct cx88_core *core = data;
991 	struct v4l2_tuner t;
992 	u32 mode = 0;
993 
994 	dprintk("cx88: tvaudio thread started\n");
995 	set_freezable();
996 	for (;;) {
997 		msleep_interruptible(1000);
998 		if (kthread_should_stop())
999 			break;
1000 		try_to_freeze();
1001 
1002 		switch (core->tvaudio) {
1003 		case WW_BG:
1004 		case WW_DK:
1005 		case WW_M:
1006 		case WW_I:
1007 		case WW_L:
1008 			if (core->use_nicam)
1009 				goto hw_autodetect;
1010 
1011 			/* just monitor the audio status for now ... */
1012 			memset(&t, 0, sizeof(t));
1013 			cx88_get_stereo(core, &t);
1014 
1015 			if (UNSET != core->audiomode_manual)
1016 				/* manually set, don't do anything. */
1017 				continue;
1018 
1019 			/* monitor signal and set stereo if available */
1020 			if (t.rxsubchans & V4L2_TUNER_SUB_STEREO)
1021 				mode = V4L2_TUNER_MODE_STEREO;
1022 			else
1023 				mode = V4L2_TUNER_MODE_MONO;
1024 			if (mode == core->audiomode_current)
1025 				continue;
1026 			/* automatically switch to best available mode */
1027 			cx88_set_stereo(core, mode, 0);
1028 			break;
1029 		case WW_NONE:
1030 		case WW_BTSC:
1031 		case WW_EIAJ:
1032 		case WW_I2SPT:
1033 		case WW_FM:
1034 		case WW_I2SADC:
1035 hw_autodetect:
1036 			/* stereo autodetection is supported by hardware so
1037 			   we don't need to do it manually. Do nothing. */
1038 			break;
1039 		}
1040 	}
1041 
1042 	dprintk("cx88: tvaudio thread exiting\n");
1043 	return 0;
1044 }
1045 
1046 /* ----------------------------------------------------------- */
1047 
1048 EXPORT_SYMBOL(cx88_set_tvaudio);
1049 EXPORT_SYMBOL(cx88_newstation);
1050 EXPORT_SYMBOL(cx88_set_stereo);
1051 EXPORT_SYMBOL(cx88_get_stereo);
1052 EXPORT_SYMBOL(cx88_audio_thread);
1053