1 // SPDX-License-Identifier: GPL-2.0-or-later
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 
24 #include "cx88.h"
25 
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/freezer.h>
29 #include <linux/kernel.h>
30 #include <linux/mm.h>
31 #include <linux/poll.h>
32 #include <linux/signal.h>
33 #include <linux/ioport.h>
34 #include <linux/types.h>
35 #include <linux/interrupt.h>
36 #include <linux/vmalloc.h>
37 #include <linux/init.h>
38 #include <linux/delay.h>
39 #include <linux/kthread.h>
40 
41 static unsigned int audio_debug;
42 module_param(audio_debug, int, 0644);
43 MODULE_PARM_DESC(audio_debug, "enable debug messages [audio]");
44 
45 static unsigned int always_analog;
46 module_param(always_analog, int, 0644);
47 MODULE_PARM_DESC(always_analog, "force analog audio out");
48 
49 static unsigned int radio_deemphasis;
50 module_param(radio_deemphasis, int, 0644);
51 MODULE_PARM_DESC(radio_deemphasis,
52 		 "Radio deemphasis time constant, 0=None, 1=50us (elsewhere), 2=75us (USA)");
53 
54 #define dprintk(fmt, arg...) do {				\
55 	if (audio_debug)						\
56 		printk(KERN_DEBUG pr_fmt("%s: tvaudio:" fmt),		\
57 			__func__, ##arg);				\
58 } while (0)
59 /* ----------------------------------------------------------- */
60 
61 static const char * const aud_ctl_names[64] = {
62 	[EN_BTSC_FORCE_MONO] = "BTSC_FORCE_MONO",
63 	[EN_BTSC_FORCE_STEREO] = "BTSC_FORCE_STEREO",
64 	[EN_BTSC_FORCE_SAP] = "BTSC_FORCE_SAP",
65 	[EN_BTSC_AUTO_STEREO] = "BTSC_AUTO_STEREO",
66 	[EN_BTSC_AUTO_SAP] = "BTSC_AUTO_SAP",
67 	[EN_A2_FORCE_MONO1] = "A2_FORCE_MONO1",
68 	[EN_A2_FORCE_MONO2] = "A2_FORCE_MONO2",
69 	[EN_A2_FORCE_STEREO] = "A2_FORCE_STEREO",
70 	[EN_A2_AUTO_MONO2] = "A2_AUTO_MONO2",
71 	[EN_A2_AUTO_STEREO] = "A2_AUTO_STEREO",
72 	[EN_EIAJ_FORCE_MONO1] = "EIAJ_FORCE_MONO1",
73 	[EN_EIAJ_FORCE_MONO2] = "EIAJ_FORCE_MONO2",
74 	[EN_EIAJ_FORCE_STEREO] = "EIAJ_FORCE_STEREO",
75 	[EN_EIAJ_AUTO_MONO2] = "EIAJ_AUTO_MONO2",
76 	[EN_EIAJ_AUTO_STEREO] = "EIAJ_AUTO_STEREO",
77 	[EN_NICAM_FORCE_MONO1] = "NICAM_FORCE_MONO1",
78 	[EN_NICAM_FORCE_MONO2] = "NICAM_FORCE_MONO2",
79 	[EN_NICAM_FORCE_STEREO] = "NICAM_FORCE_STEREO",
80 	[EN_NICAM_AUTO_MONO2] = "NICAM_AUTO_MONO2",
81 	[EN_NICAM_AUTO_STEREO] = "NICAM_AUTO_STEREO",
82 	[EN_FMRADIO_FORCE_MONO] = "FMRADIO_FORCE_MONO",
83 	[EN_FMRADIO_FORCE_STEREO] = "FMRADIO_FORCE_STEREO",
84 	[EN_FMRADIO_AUTO_STEREO] = "FMRADIO_AUTO_STEREO",
85 };
86 
87 struct rlist {
88 	u32 reg;
89 	u32 val;
90 };
91 
92 static void set_audio_registers(struct cx88_core *core, const struct rlist *l)
93 {
94 	int i;
95 
96 	for (i = 0; l[i].reg; i++) {
97 		switch (l[i].reg) {
98 		case AUD_PDF_DDS_CNST_BYTE2:
99 		case AUD_PDF_DDS_CNST_BYTE1:
100 		case AUD_PDF_DDS_CNST_BYTE0:
101 		case AUD_QAM_MODE:
102 		case AUD_PHACC_FREQ_8MSB:
103 		case AUD_PHACC_FREQ_8LSB:
104 			cx_writeb(l[i].reg, l[i].val);
105 			break;
106 		default:
107 			cx_write(l[i].reg, l[i].val);
108 			break;
109 		}
110 	}
111 }
112 
113 static void set_audio_start(struct cx88_core *core, u32 mode)
114 {
115 	/* mute */
116 	cx_write(AUD_VOL_CTL, (1 << 6));
117 
118 	/* start programming */
119 	cx_write(AUD_INIT, mode);
120 	cx_write(AUD_INIT_LD, 0x0001);
121 	cx_write(AUD_SOFT_RESET, 0x0001);
122 }
123 
124 static void set_audio_finish(struct cx88_core *core, u32 ctl)
125 {
126 	u32 volume;
127 
128 	/* restart dma; This avoids buzz in NICAM and is good in others  */
129 	cx88_stop_audio_dma(core);
130 	cx_write(AUD_RATE_THRES_DMD, 0x000000C0);
131 	cx88_start_audio_dma(core);
132 
133 	if (core->board.mpeg & CX88_MPEG_BLACKBIRD) {
134 		cx_write(AUD_I2SINPUTCNTL, 4);
135 		cx_write(AUD_BAUDRATE, 1);
136 		/*
137 		 * 'pass-thru mode': this enables the i2s
138 		 * output to the mpeg encoder
139 		 */
140 		cx_set(AUD_CTL, EN_I2SOUT_ENABLE);
141 		cx_write(AUD_I2SOUTPUTCNTL, 1);
142 		cx_write(AUD_I2SCNTL, 0);
143 		/* cx_write(AUD_APB_IN_RATE_ADJ, 0); */
144 	}
145 	if ((always_analog) || (!(core->board.mpeg & CX88_MPEG_BLACKBIRD))) {
146 		ctl |= EN_DAC_ENABLE;
147 		cx_write(AUD_CTL, ctl);
148 	}
149 
150 	/* finish programming */
151 	cx_write(AUD_SOFT_RESET, 0x0000);
152 
153 	/* unmute */
154 	volume = cx_sread(SHADOW_AUD_VOL_CTL);
155 	cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, volume);
156 
157 	core->last_change = jiffies;
158 }
159 
160 /* ----------------------------------------------------------- */
161 
162 static void set_audio_standard_BTSC(struct cx88_core *core, unsigned int sap,
163 				    u32 mode)
164 {
165 	static const struct rlist btsc[] = {
166 		{AUD_AFE_12DB_EN, 0x00000001},
167 		{AUD_OUT1_SEL, 0x00000013},
168 		{AUD_OUT1_SHIFT, 0x00000000},
169 		{AUD_POLY0_DDS_CONSTANT, 0x0012010c},
170 		{AUD_DMD_RA_DDS, 0x00c3e7aa},
171 		{AUD_DBX_IN_GAIN, 0x00004734},
172 		{AUD_DBX_WBE_GAIN, 0x00004640},
173 		{AUD_DBX_SE_GAIN, 0x00008d31},
174 		{AUD_DCOC_0_SRC, 0x0000001a},
175 		{AUD_IIR1_4_SEL, 0x00000021},
176 		{AUD_DCOC_PASS_IN, 0x00000003},
177 		{AUD_DCOC_0_SHIFT_IN0, 0x0000000a},
178 		{AUD_DCOC_0_SHIFT_IN1, 0x00000008},
179 		{AUD_DCOC_1_SHIFT_IN0, 0x0000000a},
180 		{AUD_DCOC_1_SHIFT_IN1, 0x00000008},
181 		{AUD_DN0_FREQ, 0x0000283b},
182 		{AUD_DN2_SRC_SEL, 0x00000008},
183 		{AUD_DN2_FREQ, 0x00003000},
184 		{AUD_DN2_AFC, 0x00000002},
185 		{AUD_DN2_SHFT, 0x00000000},
186 		{AUD_IIR2_2_SEL, 0x00000020},
187 		{AUD_IIR2_2_SHIFT, 0x00000000},
188 		{AUD_IIR2_3_SEL, 0x0000001f},
189 		{AUD_IIR2_3_SHIFT, 0x00000000},
190 		{AUD_CRDC1_SRC_SEL, 0x000003ce},
191 		{AUD_CRDC1_SHIFT, 0x00000000},
192 		{AUD_CORDIC_SHIFT_1, 0x00000007},
193 		{AUD_DCOC_1_SRC, 0x0000001b},
194 		{AUD_DCOC1_SHIFT, 0x00000000},
195 		{AUD_RDSI_SEL, 0x00000008},
196 		{AUD_RDSQ_SEL, 0x00000008},
197 		{AUD_RDSI_SHIFT, 0x00000000},
198 		{AUD_RDSQ_SHIFT, 0x00000000},
199 		{AUD_POLYPH80SCALEFAC, 0x00000003},
200 		{ /* end of list */ },
201 	};
202 	static const struct rlist btsc_sap[] = {
203 		{AUD_AFE_12DB_EN, 0x00000001},
204 		{AUD_DBX_IN_GAIN, 0x00007200},
205 		{AUD_DBX_WBE_GAIN, 0x00006200},
206 		{AUD_DBX_SE_GAIN, 0x00006200},
207 		{AUD_IIR1_1_SEL, 0x00000000},
208 		{AUD_IIR1_3_SEL, 0x00000001},
209 		{AUD_DN1_SRC_SEL, 0x00000007},
210 		{AUD_IIR1_4_SHIFT, 0x00000006},
211 		{AUD_IIR2_1_SHIFT, 0x00000000},
212 		{AUD_IIR2_2_SHIFT, 0x00000000},
213 		{AUD_IIR3_0_SHIFT, 0x00000000},
214 		{AUD_IIR3_1_SHIFT, 0x00000000},
215 		{AUD_IIR3_0_SEL, 0x0000000d},
216 		{AUD_IIR3_1_SEL, 0x0000000e},
217 		{AUD_DEEMPH1_SRC_SEL, 0x00000014},
218 		{AUD_DEEMPH1_SHIFT, 0x00000000},
219 		{AUD_DEEMPH1_G0, 0x00004000},
220 		{AUD_DEEMPH1_A0, 0x00000000},
221 		{AUD_DEEMPH1_B0, 0x00000000},
222 		{AUD_DEEMPH1_A1, 0x00000000},
223 		{AUD_DEEMPH1_B1, 0x00000000},
224 		{AUD_OUT0_SEL, 0x0000003f},
225 		{AUD_OUT1_SEL, 0x0000003f},
226 		{AUD_DN1_AFC, 0x00000002},
227 		{AUD_DCOC_0_SHIFT_IN0, 0x0000000a},
228 		{AUD_DCOC_0_SHIFT_IN1, 0x00000008},
229 		{AUD_DCOC_1_SHIFT_IN0, 0x0000000a},
230 		{AUD_DCOC_1_SHIFT_IN1, 0x00000008},
231 		{AUD_IIR1_0_SEL, 0x0000001d},
232 		{AUD_IIR1_2_SEL, 0x0000001e},
233 		{AUD_IIR2_1_SEL, 0x00000002},
234 		{AUD_IIR2_2_SEL, 0x00000004},
235 		{AUD_IIR3_2_SEL, 0x0000000f},
236 		{AUD_DCOC2_SHIFT, 0x00000001},
237 		{AUD_IIR3_2_SHIFT, 0x00000001},
238 		{AUD_DEEMPH0_SRC_SEL, 0x00000014},
239 		{AUD_CORDIC_SHIFT_1, 0x00000006},
240 		{AUD_POLY0_DDS_CONSTANT, 0x000e4db2},
241 		{AUD_DMD_RA_DDS, 0x00f696e6},
242 		{AUD_IIR2_3_SEL, 0x00000025},
243 		{AUD_IIR1_4_SEL, 0x00000021},
244 		{AUD_DN1_FREQ, 0x0000c965},
245 		{AUD_DCOC_PASS_IN, 0x00000003},
246 		{AUD_DCOC_0_SRC, 0x0000001a},
247 		{AUD_DCOC_1_SRC, 0x0000001b},
248 		{AUD_DCOC1_SHIFT, 0x00000000},
249 		{AUD_RDSI_SEL, 0x00000009},
250 		{AUD_RDSQ_SEL, 0x00000009},
251 		{AUD_RDSI_SHIFT, 0x00000000},
252 		{AUD_RDSQ_SHIFT, 0x00000000},
253 		{AUD_POLYPH80SCALEFAC, 0x00000003},
254 		{ /* end of list */ },
255 	};
256 
257 	mode |= EN_FMRADIO_EN_RDS;
258 
259 	if (sap) {
260 		dprintk("%s SAP (status: unknown)\n", __func__);
261 		set_audio_start(core, SEL_SAP);
262 		set_audio_registers(core, btsc_sap);
263 		set_audio_finish(core, mode);
264 	} else {
265 		dprintk("%s (status: known-good)\n", __func__);
266 		set_audio_start(core, SEL_BTSC);
267 		set_audio_registers(core, btsc);
268 		set_audio_finish(core, mode);
269 	}
270 }
271 
272 static void set_audio_standard_NICAM(struct cx88_core *core, u32 mode)
273 {
274 	static const struct rlist nicam_l[] = {
275 		{AUD_AFE_12DB_EN, 0x00000001},
276 		{AUD_RATE_ADJ1, 0x00000060},
277 		{AUD_RATE_ADJ2, 0x000000F9},
278 		{AUD_RATE_ADJ3, 0x000001CC},
279 		{AUD_RATE_ADJ4, 0x000002B3},
280 		{AUD_RATE_ADJ5, 0x00000726},
281 		{AUD_DEEMPHDENOM1_R, 0x0000F3D0},
282 		{AUD_DEEMPHDENOM2_R, 0x00000000},
283 		{AUD_ERRLOGPERIOD_R, 0x00000064},
284 		{AUD_ERRINTRPTTHSHLD1_R, 0x00000FFF},
285 		{AUD_ERRINTRPTTHSHLD2_R, 0x0000001F},
286 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000000F},
287 		{AUD_POLYPH80SCALEFAC, 0x00000003},
288 		{AUD_DMD_RA_DDS, 0x00C00000},
289 		{AUD_PLL_INT, 0x0000001E},
290 		{AUD_PLL_DDS, 0x00000000},
291 		{AUD_PLL_FRAC, 0x0000E542},
292 		{AUD_START_TIMER, 0x00000000},
293 		{AUD_DEEMPHNUMER1_R, 0x000353DE},
294 		{AUD_DEEMPHNUMER2_R, 0x000001B1},
295 		{AUD_PDF_DDS_CNST_BYTE2, 0x06},
296 		{AUD_PDF_DDS_CNST_BYTE1, 0x82},
297 		{AUD_PDF_DDS_CNST_BYTE0, 0x12},
298 		{AUD_QAM_MODE, 0x05},
299 		{AUD_PHACC_FREQ_8MSB, 0x34},
300 		{AUD_PHACC_FREQ_8LSB, 0x4C},
301 		{AUD_DEEMPHGAIN_R, 0x00006680},
302 		{AUD_RATE_THRES_DMD, 0x000000C0},
303 		{ /* end of list */ },
304 	};
305 
306 	static const struct rlist nicam_bgdki_common[] = {
307 		{AUD_AFE_12DB_EN, 0x00000001},
308 		{AUD_RATE_ADJ1, 0x00000010},
309 		{AUD_RATE_ADJ2, 0x00000040},
310 		{AUD_RATE_ADJ3, 0x00000100},
311 		{AUD_RATE_ADJ4, 0x00000400},
312 		{AUD_RATE_ADJ5, 0x00001000},
313 		{AUD_ERRLOGPERIOD_R, 0x00000fff},
314 		{AUD_ERRINTRPTTHSHLD1_R, 0x000003ff},
315 		{AUD_ERRINTRPTTHSHLD2_R, 0x000000ff},
316 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000003f},
317 		{AUD_POLYPH80SCALEFAC, 0x00000003},
318 		{AUD_DEEMPHGAIN_R, 0x000023c2},
319 		{AUD_DEEMPHNUMER1_R, 0x0002a7bc},
320 		{AUD_DEEMPHNUMER2_R, 0x0003023e},
321 		{AUD_DEEMPHDENOM1_R, 0x0000f3d0},
322 		{AUD_DEEMPHDENOM2_R, 0x00000000},
323 		{AUD_PDF_DDS_CNST_BYTE2, 0x06},
324 		{AUD_PDF_DDS_CNST_BYTE1, 0x82},
325 		{AUD_QAM_MODE, 0x05},
326 		{ /* end of list */ },
327 	};
328 
329 	static const struct rlist nicam_i[] = {
330 		{AUD_PDF_DDS_CNST_BYTE0, 0x12},
331 		{AUD_PHACC_FREQ_8MSB, 0x3a},
332 		{AUD_PHACC_FREQ_8LSB, 0x93},
333 		{ /* end of list */ },
334 	};
335 
336 	static const struct rlist nicam_default[] = {
337 		{AUD_PDF_DDS_CNST_BYTE0, 0x16},
338 		{AUD_PHACC_FREQ_8MSB, 0x34},
339 		{AUD_PHACC_FREQ_8LSB, 0x4c},
340 		{ /* end of list */ },
341 	};
342 
343 	set_audio_start(core, SEL_NICAM);
344 	switch (core->tvaudio) {
345 	case WW_L:
346 		dprintk("%s SECAM-L NICAM (status: devel)\n", __func__);
347 		set_audio_registers(core, nicam_l);
348 		break;
349 	case WW_I:
350 		dprintk("%s PAL-I NICAM (status: known-good)\n", __func__);
351 		set_audio_registers(core, nicam_bgdki_common);
352 		set_audio_registers(core, nicam_i);
353 		break;
354 	case WW_NONE:
355 	case WW_BTSC:
356 	case WW_BG:
357 	case WW_DK:
358 	case WW_EIAJ:
359 	case WW_I2SPT:
360 	case WW_FM:
361 	case WW_I2SADC:
362 	case WW_M:
363 		dprintk("%s PAL-BGDK NICAM (status: known-good)\n", __func__);
364 		set_audio_registers(core, nicam_bgdki_common);
365 		set_audio_registers(core, nicam_default);
366 		break;
367 	}
368 
369 	mode |= EN_DMTRX_LR | EN_DMTRX_BYPASS;
370 	set_audio_finish(core, mode);
371 }
372 
373 static void set_audio_standard_A2(struct cx88_core *core, u32 mode)
374 {
375 	static const struct rlist a2_bgdk_common[] = {
376 		{AUD_ERRLOGPERIOD_R, 0x00000064},
377 		{AUD_ERRINTRPTTHSHLD1_R, 0x00000fff},
378 		{AUD_ERRINTRPTTHSHLD2_R, 0x0000001f},
379 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000000f},
380 		{AUD_PDF_DDS_CNST_BYTE2, 0x06},
381 		{AUD_PDF_DDS_CNST_BYTE1, 0x82},
382 		{AUD_PDF_DDS_CNST_BYTE0, 0x12},
383 		{AUD_QAM_MODE, 0x05},
384 		{AUD_PHACC_FREQ_8MSB, 0x34},
385 		{AUD_PHACC_FREQ_8LSB, 0x4c},
386 		{AUD_RATE_ADJ1, 0x00000100},
387 		{AUD_RATE_ADJ2, 0x00000200},
388 		{AUD_RATE_ADJ3, 0x00000300},
389 		{AUD_RATE_ADJ4, 0x00000400},
390 		{AUD_RATE_ADJ5, 0x00000500},
391 		{AUD_THR_FR, 0x00000000},
392 		{AAGC_HYST, 0x0000001a},
393 		{AUD_PILOT_BQD_1_K0, 0x0000755b},
394 		{AUD_PILOT_BQD_1_K1, 0x00551340},
395 		{AUD_PILOT_BQD_1_K2, 0x006d30be},
396 		{AUD_PILOT_BQD_1_K3, 0xffd394af},
397 		{AUD_PILOT_BQD_1_K4, 0x00400000},
398 		{AUD_PILOT_BQD_2_K0, 0x00040000},
399 		{AUD_PILOT_BQD_2_K1, 0x002a4841},
400 		{AUD_PILOT_BQD_2_K2, 0x00400000},
401 		{AUD_PILOT_BQD_2_K3, 0x00000000},
402 		{AUD_PILOT_BQD_2_K4, 0x00000000},
403 		{AUD_MODE_CHG_TIMER, 0x00000040},
404 		{AUD_AFE_12DB_EN, 0x00000001},
405 		{AUD_CORDIC_SHIFT_0, 0x00000007},
406 		{AUD_CORDIC_SHIFT_1, 0x00000007},
407 		{AUD_DEEMPH0_G0, 0x00000380},
408 		{AUD_DEEMPH1_G0, 0x00000380},
409 		{AUD_DCOC_0_SRC, 0x0000001a},
410 		{AUD_DCOC0_SHIFT, 0x00000000},
411 		{AUD_DCOC_0_SHIFT_IN0, 0x0000000a},
412 		{AUD_DCOC_0_SHIFT_IN1, 0x00000008},
413 		{AUD_DCOC_PASS_IN, 0x00000003},
414 		{AUD_IIR3_0_SEL, 0x00000021},
415 		{AUD_DN2_AFC, 0x00000002},
416 		{AUD_DCOC_1_SRC, 0x0000001b},
417 		{AUD_DCOC1_SHIFT, 0x00000000},
418 		{AUD_DCOC_1_SHIFT_IN0, 0x0000000a},
419 		{AUD_DCOC_1_SHIFT_IN1, 0x00000008},
420 		{AUD_IIR3_1_SEL, 0x00000023},
421 		{AUD_RDSI_SEL, 0x00000017},
422 		{AUD_RDSI_SHIFT, 0x00000000},
423 		{AUD_RDSQ_SEL, 0x00000017},
424 		{AUD_RDSQ_SHIFT, 0x00000000},
425 		{AUD_PLL_INT, 0x0000001e},
426 		{AUD_PLL_DDS, 0x00000000},
427 		{AUD_PLL_FRAC, 0x0000e542},
428 		{AUD_POLYPH80SCALEFAC, 0x00000001},
429 		{AUD_START_TIMER, 0x00000000},
430 		{ /* end of list */ },
431 	};
432 
433 	static const struct rlist a2_bg[] = {
434 		{AUD_DMD_RA_DDS, 0x002a4f2f},
435 		{AUD_C1_UP_THR, 0x00007000},
436 		{AUD_C1_LO_THR, 0x00005400},
437 		{AUD_C2_UP_THR, 0x00005400},
438 		{AUD_C2_LO_THR, 0x00003000},
439 		{ /* end of list */ },
440 	};
441 
442 	static const struct rlist a2_dk[] = {
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 		{AUD_DN0_FREQ, 0x00003a1c},
449 		{AUD_DN2_FREQ, 0x0000d2e0},
450 		{ /* end of list */ },
451 	};
452 
453 	static const struct rlist a1_i[] = {
454 		{AUD_ERRLOGPERIOD_R, 0x00000064},
455 		{AUD_ERRINTRPTTHSHLD1_R, 0x00000fff},
456 		{AUD_ERRINTRPTTHSHLD2_R, 0x0000001f},
457 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000000f},
458 		{AUD_PDF_DDS_CNST_BYTE2, 0x06},
459 		{AUD_PDF_DDS_CNST_BYTE1, 0x82},
460 		{AUD_PDF_DDS_CNST_BYTE0, 0x12},
461 		{AUD_QAM_MODE, 0x05},
462 		{AUD_PHACC_FREQ_8MSB, 0x3a},
463 		{AUD_PHACC_FREQ_8LSB, 0x93},
464 		{AUD_DMD_RA_DDS, 0x002a4f2f},
465 		{AUD_PLL_INT, 0x0000001e},
466 		{AUD_PLL_DDS, 0x00000004},
467 		{AUD_PLL_FRAC, 0x0000e542},
468 		{AUD_RATE_ADJ1, 0x00000100},
469 		{AUD_RATE_ADJ2, 0x00000200},
470 		{AUD_RATE_ADJ3, 0x00000300},
471 		{AUD_RATE_ADJ4, 0x00000400},
472 		{AUD_RATE_ADJ5, 0x00000500},
473 		{AUD_THR_FR, 0x00000000},
474 		{AUD_PILOT_BQD_1_K0, 0x0000755b},
475 		{AUD_PILOT_BQD_1_K1, 0x00551340},
476 		{AUD_PILOT_BQD_1_K2, 0x006d30be},
477 		{AUD_PILOT_BQD_1_K3, 0xffd394af},
478 		{AUD_PILOT_BQD_1_K4, 0x00400000},
479 		{AUD_PILOT_BQD_2_K0, 0x00040000},
480 		{AUD_PILOT_BQD_2_K1, 0x002a4841},
481 		{AUD_PILOT_BQD_2_K2, 0x00400000},
482 		{AUD_PILOT_BQD_2_K3, 0x00000000},
483 		{AUD_PILOT_BQD_2_K4, 0x00000000},
484 		{AUD_MODE_CHG_TIMER, 0x00000060},
485 		{AUD_AFE_12DB_EN, 0x00000001},
486 		{AAGC_HYST, 0x0000000a},
487 		{AUD_CORDIC_SHIFT_0, 0x00000007},
488 		{AUD_CORDIC_SHIFT_1, 0x00000007},
489 		{AUD_C1_UP_THR, 0x00007000},
490 		{AUD_C1_LO_THR, 0x00005400},
491 		{AUD_C2_UP_THR, 0x00005400},
492 		{AUD_C2_LO_THR, 0x00003000},
493 		{AUD_DCOC_0_SRC, 0x0000001a},
494 		{AUD_DCOC0_SHIFT, 0x00000000},
495 		{AUD_DCOC_0_SHIFT_IN0, 0x0000000a},
496 		{AUD_DCOC_0_SHIFT_IN1, 0x00000008},
497 		{AUD_DCOC_PASS_IN, 0x00000003},
498 		{AUD_IIR3_0_SEL, 0x00000021},
499 		{AUD_DN2_AFC, 0x00000002},
500 		{AUD_DCOC_1_SRC, 0x0000001b},
501 		{AUD_DCOC1_SHIFT, 0x00000000},
502 		{AUD_DCOC_1_SHIFT_IN0, 0x0000000a},
503 		{AUD_DCOC_1_SHIFT_IN1, 0x00000008},
504 		{AUD_IIR3_1_SEL, 0x00000023},
505 		{AUD_DN0_FREQ, 0x000035a3},
506 		{AUD_DN2_FREQ, 0x000029c7},
507 		{AUD_CRDC0_SRC_SEL, 0x00000511},
508 		{AUD_IIR1_0_SEL, 0x00000001},
509 		{AUD_IIR1_1_SEL, 0x00000000},
510 		{AUD_IIR3_2_SEL, 0x00000003},
511 		{AUD_IIR3_2_SHIFT, 0x00000000},
512 		{AUD_IIR3_0_SEL, 0x00000002},
513 		{AUD_IIR2_0_SEL, 0x00000021},
514 		{AUD_IIR2_0_SHIFT, 0x00000002},
515 		{AUD_DEEMPH0_SRC_SEL, 0x0000000b},
516 		{AUD_DEEMPH1_SRC_SEL, 0x0000000b},
517 		{AUD_POLYPH80SCALEFAC, 0x00000001},
518 		{AUD_START_TIMER, 0x00000000},
519 		{ /* end of list */ },
520 	};
521 
522 	static const struct rlist am_l[] = {
523 		{AUD_ERRLOGPERIOD_R, 0x00000064},
524 		{AUD_ERRINTRPTTHSHLD1_R, 0x00000FFF},
525 		{AUD_ERRINTRPTTHSHLD2_R, 0x0000001F},
526 		{AUD_ERRINTRPTTHSHLD3_R, 0x0000000F},
527 		{AUD_PDF_DDS_CNST_BYTE2, 0x48},
528 		{AUD_PDF_DDS_CNST_BYTE1, 0x3D},
529 		{AUD_QAM_MODE, 0x00},
530 		{AUD_PDF_DDS_CNST_BYTE0, 0xf5},
531 		{AUD_PHACC_FREQ_8MSB, 0x3a},
532 		{AUD_PHACC_FREQ_8LSB, 0x4a},
533 		{AUD_DEEMPHGAIN_R, 0x00006680},
534 		{AUD_DEEMPHNUMER1_R, 0x000353DE},
535 		{AUD_DEEMPHNUMER2_R, 0x000001B1},
536 		{AUD_DEEMPHDENOM1_R, 0x0000F3D0},
537 		{AUD_DEEMPHDENOM2_R, 0x00000000},
538 		{AUD_FM_MODE_ENABLE, 0x00000007},
539 		{AUD_POLYPH80SCALEFAC, 0x00000003},
540 		{AUD_AFE_12DB_EN, 0x00000001},
541 		{AAGC_GAIN, 0x00000000},
542 		{AAGC_HYST, 0x00000018},
543 		{AAGC_DEF, 0x00000020},
544 		{AUD_DN0_FREQ, 0x00000000},
545 		{AUD_POLY0_DDS_CONSTANT, 0x000E4DB2},
546 		{AUD_DCOC_0_SRC, 0x00000021},
547 		{AUD_IIR1_0_SEL, 0x00000000},
548 		{AUD_IIR1_0_SHIFT, 0x00000007},
549 		{AUD_IIR1_1_SEL, 0x00000002},
550 		{AUD_IIR1_1_SHIFT, 0x00000000},
551 		{AUD_DCOC_1_SRC, 0x00000003},
552 		{AUD_DCOC1_SHIFT, 0x00000000},
553 		{AUD_DCOC_PASS_IN, 0x00000000},
554 		{AUD_IIR1_2_SEL, 0x00000023},
555 		{AUD_IIR1_2_SHIFT, 0x00000000},
556 		{AUD_IIR1_3_SEL, 0x00000004},
557 		{AUD_IIR1_3_SHIFT, 0x00000007},
558 		{AUD_IIR1_4_SEL, 0x00000005},
559 		{AUD_IIR1_4_SHIFT, 0x00000007},
560 		{AUD_IIR3_0_SEL, 0x00000007},
561 		{AUD_IIR3_0_SHIFT, 0x00000000},
562 		{AUD_DEEMPH0_SRC_SEL, 0x00000011},
563 		{AUD_DEEMPH0_SHIFT, 0x00000000},
564 		{AUD_DEEMPH0_G0, 0x00007000},
565 		{AUD_DEEMPH0_A0, 0x00000000},
566 		{AUD_DEEMPH0_B0, 0x00000000},
567 		{AUD_DEEMPH0_A1, 0x00000000},
568 		{AUD_DEEMPH0_B1, 0x00000000},
569 		{AUD_DEEMPH1_SRC_SEL, 0x00000011},
570 		{AUD_DEEMPH1_SHIFT, 0x00000000},
571 		{AUD_DEEMPH1_G0, 0x00007000},
572 		{AUD_DEEMPH1_A0, 0x00000000},
573 		{AUD_DEEMPH1_B0, 0x00000000},
574 		{AUD_DEEMPH1_A1, 0x00000000},
575 		{AUD_DEEMPH1_B1, 0x00000000},
576 		{AUD_OUT0_SEL, 0x0000003F},
577 		{AUD_OUT1_SEL, 0x0000003F},
578 		{AUD_DMD_RA_DDS, 0x00F5C285},
579 		{AUD_PLL_INT, 0x0000001E},
580 		{AUD_PLL_DDS, 0x00000000},
581 		{AUD_PLL_FRAC, 0x0000E542},
582 		{AUD_RATE_ADJ1, 0x00000100},
583 		{AUD_RATE_ADJ2, 0x00000200},
584 		{AUD_RATE_ADJ3, 0x00000300},
585 		{AUD_RATE_ADJ4, 0x00000400},
586 		{AUD_RATE_ADJ5, 0x00000500},
587 		{AUD_RATE_THRES_DMD, 0x000000C0},
588 		{ /* end of list */ },
589 	};
590 
591 	static const struct rlist a2_deemph50[] = {
592 		{AUD_DEEMPH0_G0, 0x00000380},
593 		{AUD_DEEMPH1_G0, 0x00000380},
594 		{AUD_DEEMPHGAIN_R, 0x000011e1},
595 		{AUD_DEEMPHNUMER1_R, 0x0002a7bc},
596 		{AUD_DEEMPHNUMER2_R, 0x0003023c},
597 		{ /* end of list */ },
598 	};
599 
600 	set_audio_start(core, SEL_A2);
601 	switch (core->tvaudio) {
602 	case WW_BG:
603 		dprintk("%s PAL-BG A1/2 (status: known-good)\n", __func__);
604 		set_audio_registers(core, a2_bgdk_common);
605 		set_audio_registers(core, a2_bg);
606 		set_audio_registers(core, a2_deemph50);
607 		break;
608 	case WW_DK:
609 		dprintk("%s PAL-DK A1/2 (status: known-good)\n", __func__);
610 		set_audio_registers(core, a2_bgdk_common);
611 		set_audio_registers(core, a2_dk);
612 		set_audio_registers(core, a2_deemph50);
613 		break;
614 	case WW_I:
615 		dprintk("%s PAL-I A1 (status: known-good)\n", __func__);
616 		set_audio_registers(core, a1_i);
617 		set_audio_registers(core, a2_deemph50);
618 		break;
619 	case WW_L:
620 		dprintk("%s AM-L (status: devel)\n", __func__);
621 		set_audio_registers(core, am_l);
622 		break;
623 	case WW_NONE:
624 	case WW_BTSC:
625 	case WW_EIAJ:
626 	case WW_I2SPT:
627 	case WW_FM:
628 	case WW_I2SADC:
629 	case WW_M:
630 		dprintk("%s Warning: wrong value\n", __func__);
631 		return;
632 	}
633 
634 	mode |= EN_FMRADIO_EN_RDS | EN_DMTRX_SUMDIFF;
635 	set_audio_finish(core, mode);
636 }
637 
638 static void set_audio_standard_EIAJ(struct cx88_core *core)
639 {
640 	static const struct rlist eiaj[] = {
641 		/* TODO: eiaj register settings are not there yet ... */
642 
643 		{ /* end of list */ },
644 	};
645 	dprintk("%s (status: unknown)\n", __func__);
646 
647 	set_audio_start(core, SEL_EIAJ);
648 	set_audio_registers(core, eiaj);
649 	set_audio_finish(core, EN_EIAJ_AUTO_STEREO);
650 }
651 
652 static void set_audio_standard_FM(struct cx88_core *core,
653 				  enum cx88_deemph_type deemph)
654 {
655 	static const struct rlist fm_deemph_50[] = {
656 		{AUD_DEEMPH0_G0, 0x0C45},
657 		{AUD_DEEMPH0_A0, 0x6262},
658 		{AUD_DEEMPH0_B0, 0x1C29},
659 		{AUD_DEEMPH0_A1, 0x3FC66},
660 		{AUD_DEEMPH0_B1, 0x399A},
661 
662 		{AUD_DEEMPH1_G0, 0x0D80},
663 		{AUD_DEEMPH1_A0, 0x6262},
664 		{AUD_DEEMPH1_B0, 0x1C29},
665 		{AUD_DEEMPH1_A1, 0x3FC66},
666 		{AUD_DEEMPH1_B1, 0x399A},
667 
668 		{AUD_POLYPH80SCALEFAC, 0x0003},
669 		{ /* end of list */ },
670 	};
671 	static const struct rlist fm_deemph_75[] = {
672 		{AUD_DEEMPH0_G0, 0x091B},
673 		{AUD_DEEMPH0_A0, 0x6B68},
674 		{AUD_DEEMPH0_B0, 0x11EC},
675 		{AUD_DEEMPH0_A1, 0x3FC66},
676 		{AUD_DEEMPH0_B1, 0x399A},
677 
678 		{AUD_DEEMPH1_G0, 0x0AA0},
679 		{AUD_DEEMPH1_A0, 0x6B68},
680 		{AUD_DEEMPH1_B0, 0x11EC},
681 		{AUD_DEEMPH1_A1, 0x3FC66},
682 		{AUD_DEEMPH1_B1, 0x399A},
683 
684 		{AUD_POLYPH80SCALEFAC, 0x0003},
685 		{ /* end of list */ },
686 	};
687 
688 	/*
689 	 * It is enough to leave default values?
690 	 *
691 	 * No, it's not!  The deemphasis registers are reset to the 75us
692 	 * values by default.  Analyzing the spectrum of the decoded audio
693 	 * reveals that "no deemphasis" is the same as 75 us, while the 50 us
694 	 * setting results in less deemphasis.
695 	 */
696 	static const struct rlist fm_no_deemph[] = {
697 		{AUD_POLYPH80SCALEFAC, 0x0003},
698 		{ /* end of list */ },
699 	};
700 
701 	dprintk("%s (status: unknown)\n", __func__);
702 	set_audio_start(core, SEL_FMRADIO);
703 
704 	switch (deemph) {
705 	default:
706 	case FM_NO_DEEMPH:
707 		set_audio_registers(core, fm_no_deemph);
708 		break;
709 
710 	case FM_DEEMPH_50:
711 		set_audio_registers(core, fm_deemph_50);
712 		break;
713 
714 	case FM_DEEMPH_75:
715 		set_audio_registers(core, fm_deemph_75);
716 		break;
717 	}
718 
719 	set_audio_finish(core, EN_FMRADIO_AUTO_STEREO);
720 }
721 
722 /* ----------------------------------------------------------- */
723 
724 static int cx88_detect_nicam(struct cx88_core *core)
725 {
726 	int i, j = 0;
727 
728 	dprintk("start nicam autodetect.\n");
729 
730 	for (i = 0; i < 6; i++) {
731 		/* if bit1=1 then nicam is detected */
732 		j += ((cx_read(AUD_NICAM_STATUS2) & 0x02) >> 1);
733 
734 		if (j == 1) {
735 			dprintk("nicam is detected.\n");
736 			return 1;
737 		}
738 
739 		/* wait a little bit for next reading status */
740 		usleep_range(10000, 20000);
741 	}
742 
743 	dprintk("nicam is not detected.\n");
744 	return 0;
745 }
746 
747 void cx88_set_tvaudio(struct cx88_core *core)
748 {
749 	switch (core->tvaudio) {
750 	case WW_BTSC:
751 		set_audio_standard_BTSC(core, 0, EN_BTSC_AUTO_STEREO);
752 		break;
753 	case WW_BG:
754 	case WW_DK:
755 	case WW_M:
756 	case WW_I:
757 	case WW_L:
758 		/* prepare all dsp registers */
759 		set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
760 
761 		/*
762 		 * set nicam mode - otherwise
763 		 * AUD_NICAM_STATUS2 contains wrong values
764 		 */
765 		set_audio_standard_NICAM(core, EN_NICAM_AUTO_STEREO);
766 		if (cx88_detect_nicam(core) == 0) {
767 			/* fall back to fm / am mono */
768 			set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
769 			core->audiomode_current = V4L2_TUNER_MODE_MONO;
770 			core->use_nicam = 0;
771 		} else {
772 			core->use_nicam = 1;
773 		}
774 		break;
775 	case WW_EIAJ:
776 		set_audio_standard_EIAJ(core);
777 		break;
778 	case WW_FM:
779 		set_audio_standard_FM(core, radio_deemphasis);
780 		break;
781 	case WW_I2SADC:
782 		set_audio_start(core, 0x01);
783 		/*
784 		 * Slave/Philips/Autobaud
785 		 * NB on Nova-S bit1 NPhilipsSony appears to be inverted:
786 		 *	0= Sony, 1=Philips
787 		 */
788 		cx_write(AUD_I2SINPUTCNTL, core->board.i2sinputcntl);
789 		/* Switch to "I2S ADC mode" */
790 		cx_write(AUD_I2SCNTL, 0x1);
791 		set_audio_finish(core, EN_I2SIN_ENABLE);
792 		break;
793 	case WW_NONE:
794 	case WW_I2SPT:
795 		pr_info("unknown tv audio mode [%d]\n", core->tvaudio);
796 		break;
797 	}
798 }
799 EXPORT_SYMBOL(cx88_set_tvaudio);
800 
801 void cx88_newstation(struct cx88_core *core)
802 {
803 	core->audiomode_manual = UNSET;
804 	core->last_change = jiffies;
805 }
806 EXPORT_SYMBOL(cx88_newstation);
807 
808 void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t)
809 {
810 	static const char * const m[] = { "stereo", "dual mono",
811 					  "mono",   "sap" };
812 	static const char * const p[] = { "no pilot", "pilot c1",
813 					  "pilot c2", "?" };
814 	u32 reg, mode, pilot;
815 
816 	reg = cx_read(AUD_STATUS);
817 	mode = reg & 0x03;
818 	pilot = (reg >> 2) & 0x03;
819 
820 	if (core->astat != reg)
821 		dprintk("AUD_STATUS: 0x%x [%s/%s] ctl=%s\n",
822 			reg, m[mode], p[pilot],
823 			aud_ctl_names[cx_read(AUD_CTL) & 63]);
824 	core->astat = reg;
825 
826 	t->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_SAP |
827 	    V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
828 	t->rxsubchans = UNSET;
829 	t->audmode = V4L2_TUNER_MODE_MONO;
830 
831 	switch (mode) {
832 	case 0:
833 		t->audmode = V4L2_TUNER_MODE_STEREO;
834 		break;
835 	case 1:
836 		t->audmode = V4L2_TUNER_MODE_LANG2;
837 		break;
838 	case 2:
839 		t->audmode = V4L2_TUNER_MODE_MONO;
840 		break;
841 	case 3:
842 		t->audmode = V4L2_TUNER_MODE_SAP;
843 		break;
844 	}
845 
846 	switch (core->tvaudio) {
847 	case WW_BTSC:
848 	case WW_BG:
849 	case WW_DK:
850 	case WW_M:
851 	case WW_EIAJ:
852 		if (!core->use_nicam) {
853 			t->rxsubchans = cx88_dsp_detect_stereo_sap(core);
854 			break;
855 		}
856 		break;
857 	case WW_NONE:
858 	case WW_I:
859 	case WW_L:
860 	case WW_I2SPT:
861 	case WW_FM:
862 	case WW_I2SADC:
863 		/* nothing */
864 		break;
865 	}
866 
867 	/* If software stereo detection is not supported... */
868 	if (t->rxsubchans == UNSET) {
869 		t->rxsubchans = V4L2_TUNER_SUB_MONO;
870 		/*
871 		 * If the hardware itself detected stereo, also return
872 		 * stereo as an available subchannel
873 		 */
874 		if (t->audmode == V4L2_TUNER_MODE_STEREO)
875 			t->rxsubchans |= V4L2_TUNER_SUB_STEREO;
876 	}
877 }
878 EXPORT_SYMBOL(cx88_get_stereo);
879 
880 
881 void cx88_set_stereo(struct cx88_core *core, u32 mode, int manual)
882 {
883 	u32 ctl = UNSET;
884 	u32 mask = UNSET;
885 
886 	if (manual) {
887 		core->audiomode_manual = mode;
888 	} else {
889 		if (core->audiomode_manual != UNSET)
890 			return;
891 	}
892 	core->audiomode_current = mode;
893 
894 	switch (core->tvaudio) {
895 	case WW_BTSC:
896 		switch (mode) {
897 		case V4L2_TUNER_MODE_MONO:
898 			set_audio_standard_BTSC(core, 0, EN_BTSC_FORCE_MONO);
899 			break;
900 		case V4L2_TUNER_MODE_LANG1:
901 			set_audio_standard_BTSC(core, 0, EN_BTSC_AUTO_STEREO);
902 			break;
903 		case V4L2_TUNER_MODE_LANG2:
904 			set_audio_standard_BTSC(core, 1, EN_BTSC_FORCE_SAP);
905 			break;
906 		case V4L2_TUNER_MODE_STEREO:
907 		case V4L2_TUNER_MODE_LANG1_LANG2:
908 			set_audio_standard_BTSC(core, 0, EN_BTSC_FORCE_STEREO);
909 			break;
910 		}
911 		break;
912 	case WW_BG:
913 	case WW_DK:
914 	case WW_M:
915 	case WW_I:
916 	case WW_L:
917 		if (core->use_nicam == 1) {
918 			switch (mode) {
919 			case V4L2_TUNER_MODE_MONO:
920 			case V4L2_TUNER_MODE_LANG1:
921 				set_audio_standard_NICAM(core,
922 							 EN_NICAM_FORCE_MONO1);
923 				break;
924 			case V4L2_TUNER_MODE_LANG2:
925 				set_audio_standard_NICAM(core,
926 							 EN_NICAM_FORCE_MONO2);
927 				break;
928 			case V4L2_TUNER_MODE_STEREO:
929 			case V4L2_TUNER_MODE_LANG1_LANG2:
930 				set_audio_standard_NICAM(core,
931 							 EN_NICAM_FORCE_STEREO);
932 				break;
933 			}
934 		} else {
935 			if ((core->tvaudio == WW_I) ||
936 			    (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 (ctl != UNSET) {
979 		dprintk("cx88_set_stereo: mask 0x%x, ctl 0x%x [status=0x%x,ctl=0x%x,vol=0x%x]\n",
980 			mask, ctl, cx_read(AUD_STATUS),
981 			cx_read(AUD_CTL), cx_sread(SHADOW_AUD_VOL_CTL));
982 		cx_andor(AUD_CTL, mask, ctl);
983 	}
984 }
985 EXPORT_SYMBOL(cx88_set_stereo);
986 
987 int cx88_audio_thread(void *data)
988 {
989 	struct cx88_core *core = data;
990 	struct v4l2_tuner t;
991 	u32 mode = 0;
992 
993 	dprintk("cx88: tvaudio thread started\n");
994 	set_freezable();
995 	for (;;) {
996 		msleep_interruptible(1000);
997 		if (kthread_should_stop())
998 			break;
999 		try_to_freeze();
1000 
1001 		switch (core->tvaudio) {
1002 		case WW_BG:
1003 		case WW_DK:
1004 		case WW_M:
1005 		case WW_I:
1006 		case WW_L:
1007 			if (core->use_nicam)
1008 				goto hw_autodetect;
1009 
1010 			/* just monitor the audio status for now ... */
1011 			memset(&t, 0, sizeof(t));
1012 			cx88_get_stereo(core, &t);
1013 
1014 			if (core->audiomode_manual != UNSET)
1015 				/* manually set, don't do anything. */
1016 				continue;
1017 
1018 			/* monitor signal and set stereo if available */
1019 			if (t.rxsubchans & V4L2_TUNER_SUB_STEREO)
1020 				mode = V4L2_TUNER_MODE_STEREO;
1021 			else
1022 				mode = V4L2_TUNER_MODE_MONO;
1023 			if (mode == core->audiomode_current)
1024 				continue;
1025 			/* automatically switch to best available mode */
1026 			cx88_set_stereo(core, mode, 0);
1027 			break;
1028 		case WW_NONE:
1029 		case WW_BTSC:
1030 		case WW_EIAJ:
1031 		case WW_I2SPT:
1032 		case WW_FM:
1033 		case WW_I2SADC:
1034 hw_autodetect:
1035 			/*
1036 			 * stereo autodetection is supported by hardware so
1037 			 * we don't need to do it manually. Do nothing.
1038 			 */
1039 			break;
1040 		}
1041 	}
1042 
1043 	dprintk("cx88: tvaudio thread exiting\n");
1044 	return 0;
1045 }
1046 EXPORT_SYMBOL(cx88_audio_thread);
1047