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TOMOYO Linux Cross Reference
Linux/sound/soc/codecs/wm8940.c

Version: ~ [ linux-5.6-rc1 ] ~ [ linux-5.5.2 ] ~ [ linux-5.4.17 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.102 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.170 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.213 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.213 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * wm8940.c  --  WM8940 ALSA Soc Audio driver
  3  *
  4  * Author: Jonathan Cameron <jic23@cam.ac.uk>
  5  *
  6  * Based on wm8510.c
  7  *    Copyright  2006 Wolfson Microelectronics PLC.
  8  *    Author:  Liam Girdwood <lrg@slimlogic.co.uk>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  *
 14  * Not currently handled:
 15  * Notch filter control
 16  * AUXMode (inverting vs mixer)
 17  * No means to obtain current gain if alc enabled.
 18  * No use made of gpio
 19  * Fast VMID discharge for power down
 20  * Soft Start
 21  * DLR and ALR Swaps not enabled
 22  * Digital Sidetone not supported
 23  */
 24 #include <linux/module.h>
 25 #include <linux/moduleparam.h>
 26 #include <linux/kernel.h>
 27 #include <linux/init.h>
 28 #include <linux/delay.h>
 29 #include <linux/pm.h>
 30 #include <linux/i2c.h>
 31 #include <linux/regmap.h>
 32 #include <linux/slab.h>
 33 #include <sound/core.h>
 34 #include <sound/pcm.h>
 35 #include <sound/pcm_params.h>
 36 #include <sound/soc.h>
 37 #include <sound/initval.h>
 38 #include <sound/tlv.h>
 39 
 40 #include "wm8940.h"
 41 
 42 struct wm8940_priv {
 43         unsigned int sysclk;
 44         struct regmap *regmap;
 45 };
 46 
 47 static bool wm8940_volatile_register(struct device *dev, unsigned int reg)
 48 {
 49         switch (reg) {
 50         case WM8940_SOFTRESET:
 51                 return true;
 52         default:
 53                 return false;
 54         }
 55 }
 56 
 57 static bool wm8940_readable_register(struct device *dev, unsigned int reg)
 58 {
 59         switch (reg) {
 60         case WM8940_SOFTRESET:
 61         case WM8940_POWER1:
 62         case WM8940_POWER2:
 63         case WM8940_POWER3:
 64         case WM8940_IFACE:
 65         case WM8940_COMPANDINGCTL:
 66         case WM8940_CLOCK:
 67         case WM8940_ADDCNTRL:
 68         case WM8940_GPIO:
 69         case WM8940_CTLINT:
 70         case WM8940_DAC:
 71         case WM8940_DACVOL:
 72         case WM8940_ADC:
 73         case WM8940_ADCVOL:
 74         case WM8940_NOTCH1:
 75         case WM8940_NOTCH2:
 76         case WM8940_NOTCH3:
 77         case WM8940_NOTCH4:
 78         case WM8940_NOTCH5:
 79         case WM8940_NOTCH6:
 80         case WM8940_NOTCH7:
 81         case WM8940_NOTCH8:
 82         case WM8940_DACLIM1:
 83         case WM8940_DACLIM2:
 84         case WM8940_ALC1:
 85         case WM8940_ALC2:
 86         case WM8940_ALC3:
 87         case WM8940_NOISEGATE:
 88         case WM8940_PLLN:
 89         case WM8940_PLLK1:
 90         case WM8940_PLLK2:
 91         case WM8940_PLLK3:
 92         case WM8940_ALC4:
 93         case WM8940_INPUTCTL:
 94         case WM8940_PGAGAIN:
 95         case WM8940_ADCBOOST:
 96         case WM8940_OUTPUTCTL:
 97         case WM8940_SPKMIX:
 98         case WM8940_SPKVOL:
 99         case WM8940_MONOMIX:
100                 return true;
101         default:
102                 return false;
103         }
104 }
105 
106 static const struct reg_default wm8940_reg_defaults[] = {
107         {  0x1, 0x0000 }, /* Power 1 */
108         {  0x2, 0x0000 }, /* Power 2 */
109         {  0x3, 0x0000 }, /* Power 3 */
110         {  0x4, 0x0010 }, /* Interface Control */
111         {  0x5, 0x0000 }, /* Companding Control */
112         {  0x6, 0x0140 }, /* Clock Control */
113         {  0x7, 0x0000 }, /* Additional Controls */
114         {  0x8, 0x0000 }, /* GPIO Control */
115         {  0x9, 0x0002 }, /* Auto Increment Control */
116         {  0xa, 0x0000 }, /* DAC Control */
117         {  0xb, 0x00FF }, /* DAC Volume */
118 
119         {  0xe, 0x0100 }, /* ADC Control */
120         {  0xf, 0x00FF }, /* ADC Volume */
121         { 0x10, 0x0000 }, /* Notch Filter 1 Control 1 */
122         { 0x11, 0x0000 }, /* Notch Filter 1 Control 2 */
123         { 0x12, 0x0000 }, /* Notch Filter 2 Control 1 */
124         { 0x13, 0x0000 }, /* Notch Filter 2 Control 2 */
125         { 0x14, 0x0000 }, /* Notch Filter 3 Control 1 */
126         { 0x15, 0x0000 }, /* Notch Filter 3 Control 2 */
127         { 0x16, 0x0000 }, /* Notch Filter 4 Control 1 */
128         { 0x17, 0x0000 }, /* Notch Filter 4 Control 2 */
129         { 0x18, 0x0032 }, /* DAC Limit Control 1 */
130         { 0x19, 0x0000 }, /* DAC Limit Control 2 */
131 
132         { 0x20, 0x0038 }, /* ALC Control 1 */
133         { 0x21, 0x000B }, /* ALC Control 2 */
134         { 0x22, 0x0032 }, /* ALC Control 3 */
135         { 0x23, 0x0000 }, /* Noise Gate */
136         { 0x24, 0x0041 }, /* PLLN */
137         { 0x25, 0x000C }, /* PLLK1 */
138         { 0x26, 0x0093 }, /* PLLK2 */
139         { 0x27, 0x00E9 }, /* PLLK3 */
140 
141         { 0x2a, 0x0030 }, /* ALC Control 4 */
142 
143         { 0x2c, 0x0002 }, /* Input Control */
144         { 0x2d, 0x0050 }, /* PGA Gain */
145 
146         { 0x2f, 0x0002 }, /* ADC Boost Control */
147 
148         { 0x31, 0x0002 }, /* Output Control */
149         { 0x32, 0x0000 }, /* Speaker Mixer Control */
150 
151         { 0x36, 0x0079 }, /* Speaker Volume */
152 
153         { 0x38, 0x0000 }, /* Mono Mixer Control */
154 };
155 
156 static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
157 static SOC_ENUM_SINGLE_DECL(wm8940_adc_companding_enum,
158                             WM8940_COMPANDINGCTL, 1, wm8940_companding);
159 static SOC_ENUM_SINGLE_DECL(wm8940_dac_companding_enum,
160                             WM8940_COMPANDINGCTL, 3, wm8940_companding);
161 
162 static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
163 static SOC_ENUM_SINGLE_DECL(wm8940_alc_mode_enum,
164                             WM8940_ALC3, 8, wm8940_alc_mode_text);
165 
166 static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
167 static SOC_ENUM_SINGLE_DECL(wm8940_mic_bias_level_enum,
168                             WM8940_INPUTCTL, 8, wm8940_mic_bias_level_text);
169 
170 static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
171 static SOC_ENUM_SINGLE_DECL(wm8940_filter_mode_enum,
172                             WM8940_ADC, 7, wm8940_filter_mode_text);
173 
174 static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
175 static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
176 static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
177 static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
178 static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
179 static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
180 static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
181 static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
182 static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
183 static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);
184 
185 static const struct snd_kcontrol_new wm8940_snd_controls[] = {
186         SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
187                    6, 1, 0),
188         SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
189         SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),
190 
191         SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
192         SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
193         SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
194                        3, 7, 1, wm8940_alc_max_tlv),
195         SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
196                        0, 7, 0, wm8940_alc_min_tlv),
197         SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
198                        0, 14, 0, wm8940_alc_tar_tlv),
199         SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
200         SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
201         SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
202         SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
203         SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
204                    3, 1, 0),
205         SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
206                    0, 7, 0),
207 
208         SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
209         SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
210         SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
211         SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
212                        4, 9, 1, wm8940_lim_thresh_tlv),
213         SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
214                        0, 12, 0, wm8940_lim_boost_tlv),
215 
216         SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
217         SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
218                        0, 63, 0, wm8940_pga_vol_tlv),
219         SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
220                        0, 255, 0, wm8940_adc_tlv),
221         SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
222                        0, 255, 0, wm8940_adc_tlv),
223         SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
224         SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
225                        8, 1, 0, wm8940_capture_boost_vol_tlv),
226         SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
227                        0, 63, 0, wm8940_spk_vol_tlv),
228         SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL,  6, 1, 1),
229 
230         SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
231                        8, 1, 1, wm8940_att_tlv),
232         SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),
233 
234         SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
235         SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
236                        7, 1, 1, wm8940_att_tlv),
237 
238         SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
239         SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
240         SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
241         SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
242         SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
243         SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
244         SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
245 };
246 
247 static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
248         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
249         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
250         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
251 };
252 
253 static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
254         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
255         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
256         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
257 };
258 
259 static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
260 static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
261         SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
262         SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
263                             0, 7, 0, wm8940_boost_vol_tlv),
264         SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
265                             4, 7, 0, wm8940_boost_vol_tlv),
266 };
267 
268 static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
269         SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
270         SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
271         SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
272 };
273 
274 static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
275         SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
276                            &wm8940_speaker_mixer_controls[0],
277                            ARRAY_SIZE(wm8940_speaker_mixer_controls)),
278         SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
279                            &wm8940_mono_mixer_controls[0],
280                            ARRAY_SIZE(wm8940_mono_mixer_controls)),
281         SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),
282 
283         SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
284         SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
285         SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
286         SND_SOC_DAPM_OUTPUT("MONOOUT"),
287         SND_SOC_DAPM_OUTPUT("SPKOUTP"),
288         SND_SOC_DAPM_OUTPUT("SPKOUTN"),
289 
290         SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
291         SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
292         SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
293                            &wm8940_micpga_controls[0],
294                            ARRAY_SIZE(wm8940_micpga_controls)),
295         SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
296                            &wm8940_input_boost_controls[0],
297                            ARRAY_SIZE(wm8940_input_boost_controls)),
298         SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),
299 
300         SND_SOC_DAPM_INPUT("MICN"),
301         SND_SOC_DAPM_INPUT("MICP"),
302         SND_SOC_DAPM_INPUT("AUX"),
303 };
304 
305 static const struct snd_soc_dapm_route wm8940_dapm_routes[] = {
306         /* Mono output mixer */
307         {"Mono Mixer", "PCM Playback Switch", "DAC"},
308         {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
309         {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
310 
311         /* Speaker output mixer */
312         {"Speaker Mixer", "PCM Playback Switch", "DAC"},
313         {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
314         {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
315 
316         /* Outputs */
317         {"Mono Out", NULL, "Mono Mixer"},
318         {"MONOOUT", NULL, "Mono Out"},
319         {"SpkN Out", NULL, "Speaker Mixer"},
320         {"SpkP Out", NULL, "Speaker Mixer"},
321         {"SPKOUTN", NULL, "SpkN Out"},
322         {"SPKOUTP", NULL, "SpkP Out"},
323 
324         /*  Microphone PGA */
325         {"Mic PGA", "MICN Switch", "MICN"},
326         {"Mic PGA", "MICP Switch", "MICP"},
327         {"Mic PGA", "AUX Switch", "AUX"},
328 
329         /* Boost Mixer */
330         {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
331         {"Boost Mixer", "Mic Volume",  "MICP"},
332         {"Boost Mixer", "Aux Volume", "Aux Input"},
333 
334         {"ADC", NULL, "Boost Mixer"},
335 };
336 
337 #define wm8940_reset(c) snd_soc_write(c, WM8940_SOFTRESET, 0);
338 
339 static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
340                               unsigned int fmt)
341 {
342         struct snd_soc_codec *codec = codec_dai->codec;
343         u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFE67;
344         u16 clk = snd_soc_read(codec, WM8940_CLOCK) & 0x1fe;
345 
346         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
347         case SND_SOC_DAIFMT_CBM_CFM:
348                 clk |= 1;
349                 break;
350         case SND_SOC_DAIFMT_CBS_CFS:
351                 break;
352         default:
353                 return -EINVAL;
354         }
355         snd_soc_write(codec, WM8940_CLOCK, clk);
356 
357         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
358         case SND_SOC_DAIFMT_I2S:
359                 iface |= (2 << 3);
360                 break;
361         case SND_SOC_DAIFMT_LEFT_J:
362                 iface |= (1 << 3);
363                 break;
364         case SND_SOC_DAIFMT_RIGHT_J:
365                 break;
366         case SND_SOC_DAIFMT_DSP_A:
367                 iface |= (3 << 3);
368                 break;
369         case SND_SOC_DAIFMT_DSP_B:
370                 iface |= (3 << 3) | (1 << 7);
371                 break;
372         }
373 
374         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
375         case SND_SOC_DAIFMT_NB_NF:
376                 break;
377         case SND_SOC_DAIFMT_NB_IF:
378                 iface |= (1 << 7);
379                 break;
380         case SND_SOC_DAIFMT_IB_NF:
381                 iface |= (1 << 8);
382                 break;
383         case SND_SOC_DAIFMT_IB_IF:
384                 iface |= (1 << 8) | (1 << 7);
385                 break;
386         }
387 
388         snd_soc_write(codec, WM8940_IFACE, iface);
389 
390         return 0;
391 }
392 
393 static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
394                                 struct snd_pcm_hw_params *params,
395                                 struct snd_soc_dai *dai)
396 {
397         struct snd_soc_codec *codec = dai->codec;
398         u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F;
399         u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1;
400         u16 companding =  snd_soc_read(codec,
401                                                 WM8940_COMPANDINGCTL) & 0xFFDF;
402         int ret;
403 
404         /* LoutR control */
405         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
406             && params_channels(params) == 2)
407                 iface |= (1 << 9);
408 
409         switch (params_rate(params)) {
410         case 8000:
411                 addcntrl |= (0x5 << 1);
412                 break;
413         case 11025:
414                 addcntrl |= (0x4 << 1);
415                 break;
416         case 16000:
417                 addcntrl |= (0x3 << 1);
418                 break;
419         case 22050:
420                 addcntrl |= (0x2 << 1);
421                 break;
422         case 32000:
423                 addcntrl |= (0x1 << 1);
424                 break;
425         case 44100:
426         case 48000:
427                 break;
428         }
429         ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl);
430         if (ret)
431                 goto error_ret;
432 
433         switch (params_width(params)) {
434         case 8:
435                 companding = companding | (1 << 5);
436                 break;
437         case 16:
438                 break;
439         case 20:
440                 iface |= (1 << 5);
441                 break;
442         case 24:
443                 iface |= (2 << 5);
444                 break;
445         case 32:
446                 iface |= (3 << 5);
447                 break;
448         }
449         ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding);
450         if (ret)
451                 goto error_ret;
452         ret = snd_soc_write(codec, WM8940_IFACE, iface);
453 
454 error_ret:
455         return ret;
456 }
457 
458 static int wm8940_mute(struct snd_soc_dai *dai, int mute)
459 {
460         struct snd_soc_codec *codec = dai->codec;
461         u16 mute_reg = snd_soc_read(codec, WM8940_DAC) & 0xffbf;
462 
463         if (mute)
464                 mute_reg |= 0x40;
465 
466         return snd_soc_write(codec, WM8940_DAC, mute_reg);
467 }
468 
469 static int wm8940_set_bias_level(struct snd_soc_codec *codec,
470                                  enum snd_soc_bias_level level)
471 {
472         struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
473         u16 val;
474         u16 pwr_reg = snd_soc_read(codec, WM8940_POWER1) & 0x1F0;
475         int ret = 0;
476 
477         switch (level) {
478         case SND_SOC_BIAS_ON:
479                 /* ensure bufioen and biasen */
480                 pwr_reg |= (1 << 2) | (1 << 3);
481                 /* Enable thermal shutdown */
482                 val = snd_soc_read(codec, WM8940_OUTPUTCTL);
483                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, val | 0x2);
484                 if (ret)
485                         break;
486                 /* set vmid to 75k */
487                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
488                 break;
489         case SND_SOC_BIAS_PREPARE:
490                 /* ensure bufioen and biasen */
491                 pwr_reg |= (1 << 2) | (1 << 3);
492                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
493                 break;
494         case SND_SOC_BIAS_STANDBY:
495                 if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
496                         ret = regcache_sync(wm8940->regmap);
497                         if (ret < 0) {
498                                 dev_err(codec->dev, "Failed to sync cache: %d\n", ret);
499                                 return ret;
500                         }
501                 }
502 
503                 /* ensure bufioen and biasen */
504                 pwr_reg |= (1 << 2) | (1 << 3);
505                 /* set vmid to 300k for standby */
506                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x2);
507                 break;
508         case SND_SOC_BIAS_OFF:
509                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg);
510                 break;
511         }
512 
513         return ret;
514 }
515 
516 struct pll_ {
517         unsigned int pre_scale:2;
518         unsigned int n:4;
519         unsigned int k;
520 };
521 
522 static struct pll_ pll_div;
523 
524 /* The size in bits of the pll divide multiplied by 10
525  * to allow rounding later */
526 #define FIXED_PLL_SIZE ((1 << 24) * 10)
527 static void pll_factors(unsigned int target, unsigned int source)
528 {
529         unsigned long long Kpart;
530         unsigned int K, Ndiv, Nmod;
531         /* The left shift ist to avoid accuracy loss when right shifting */
532         Ndiv = target / source;
533 
534         if (Ndiv > 12) {
535                 source <<= 1;
536                 /* Multiply by 2 */
537                 pll_div.pre_scale = 0;
538                 Ndiv = target / source;
539         } else if (Ndiv < 3) {
540                 source >>= 2;
541                 /* Divide by 4 */
542                 pll_div.pre_scale = 3;
543                 Ndiv = target / source;
544         } else if (Ndiv < 6) {
545                 source >>= 1;
546                 /* divide by 2 */
547                 pll_div.pre_scale = 2;
548                 Ndiv = target / source;
549         } else
550                 pll_div.pre_scale = 1;
551 
552         if ((Ndiv < 6) || (Ndiv > 12))
553                 printk(KERN_WARNING
554                         "WM8940 N value %d outwith recommended range!d\n",
555                         Ndiv);
556 
557         pll_div.n = Ndiv;
558         Nmod = target % source;
559         Kpart = FIXED_PLL_SIZE * (long long)Nmod;
560 
561         do_div(Kpart, source);
562 
563         K = Kpart & 0xFFFFFFFF;
564 
565         /* Check if we need to round */
566         if ((K % 10) >= 5)
567                 K += 5;
568 
569         /* Move down to proper range now rounding is done */
570         K /= 10;
571 
572         pll_div.k = K;
573 }
574 
575 /* Untested at the moment */
576 static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
577                 int source, unsigned int freq_in, unsigned int freq_out)
578 {
579         struct snd_soc_codec *codec = codec_dai->codec;
580         u16 reg;
581 
582         /* Turn off PLL */
583         reg = snd_soc_read(codec, WM8940_POWER1);
584         snd_soc_write(codec, WM8940_POWER1, reg & 0x1df);
585 
586         if (freq_in == 0 || freq_out == 0) {
587                 /* Clock CODEC directly from MCLK */
588                 reg = snd_soc_read(codec, WM8940_CLOCK);
589                 snd_soc_write(codec, WM8940_CLOCK, reg & 0x0ff);
590                 /* Pll power down */
591                 snd_soc_write(codec, WM8940_PLLN, (1 << 7));
592                 return 0;
593         }
594 
595         /* Pll is followed by a frequency divide by 4 */
596         pll_factors(freq_out*4, freq_in);
597         if (pll_div.k)
598                 snd_soc_write(codec, WM8940_PLLN,
599                              (pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
600         else /* No factional component */
601                 snd_soc_write(codec, WM8940_PLLN,
602                              (pll_div.pre_scale << 4) | pll_div.n);
603         snd_soc_write(codec, WM8940_PLLK1, pll_div.k >> 18);
604         snd_soc_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
605         snd_soc_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff);
606         /* Enable the PLL */
607         reg = snd_soc_read(codec, WM8940_POWER1);
608         snd_soc_write(codec, WM8940_POWER1, reg | 0x020);
609 
610         /* Run CODEC from PLL instead of MCLK */
611         reg = snd_soc_read(codec, WM8940_CLOCK);
612         snd_soc_write(codec, WM8940_CLOCK, reg | 0x100);
613 
614         return 0;
615 }
616 
617 static int wm8940_set_dai_sysclk(struct snd_soc_dai *codec_dai,
618                                  int clk_id, unsigned int freq, int dir)
619 {
620         struct snd_soc_codec *codec = codec_dai->codec;
621         struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
622 
623         switch (freq) {
624         case 11289600:
625         case 12000000:
626         case 12288000:
627         case 16934400:
628         case 18432000:
629                 wm8940->sysclk = freq;
630                 return 0;
631         }
632         return -EINVAL;
633 }
634 
635 static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
636                                  int div_id, int div)
637 {
638         struct snd_soc_codec *codec = codec_dai->codec;
639         u16 reg;
640         int ret = 0;
641 
642         switch (div_id) {
643         case WM8940_BCLKDIV:
644                 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFE3;
645                 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2));
646                 break;
647         case WM8940_MCLKDIV:
648                 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFF1F;
649                 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 5));
650                 break;
651         case WM8940_OPCLKDIV:
652                 reg = snd_soc_read(codec, WM8940_GPIO) & 0xFFCF;
653                 ret = snd_soc_write(codec, WM8940_GPIO, reg | (div << 4));
654                 break;
655         }
656         return ret;
657 }
658 
659 #define WM8940_RATES SNDRV_PCM_RATE_8000_48000
660 
661 #define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 |                           \
662                         SNDRV_PCM_FMTBIT_S16_LE |                       \
663                         SNDRV_PCM_FMTBIT_S20_3LE |                      \
664                         SNDRV_PCM_FMTBIT_S24_LE |                       \
665                         SNDRV_PCM_FMTBIT_S32_LE)
666 
667 static const struct snd_soc_dai_ops wm8940_dai_ops = {
668         .hw_params = wm8940_i2s_hw_params,
669         .set_sysclk = wm8940_set_dai_sysclk,
670         .digital_mute = wm8940_mute,
671         .set_fmt = wm8940_set_dai_fmt,
672         .set_clkdiv = wm8940_set_dai_clkdiv,
673         .set_pll = wm8940_set_dai_pll,
674 };
675 
676 static struct snd_soc_dai_driver wm8940_dai = {
677         .name = "wm8940-hifi",
678         .playback = {
679                 .stream_name = "Playback",
680                 .channels_min = 1,
681                 .channels_max = 2,
682                 .rates = WM8940_RATES,
683                 .formats = WM8940_FORMATS,
684         },
685         .capture = {
686                 .stream_name = "Capture",
687                 .channels_min = 1,
688                 .channels_max = 2,
689                 .rates = WM8940_RATES,
690                 .formats = WM8940_FORMATS,
691         },
692         .ops = &wm8940_dai_ops,
693         .symmetric_rates = 1,
694 };
695 
696 static int wm8940_probe(struct snd_soc_codec *codec)
697 {
698         struct wm8940_setup_data *pdata = codec->dev->platform_data;
699         int ret;
700         u16 reg;
701 
702         ret = wm8940_reset(codec);
703         if (ret < 0) {
704                 dev_err(codec->dev, "Failed to issue reset\n");
705                 return ret;
706         }
707 
708         snd_soc_codec_force_bias_level(codec, SND_SOC_BIAS_STANDBY);
709 
710         ret = snd_soc_write(codec, WM8940_POWER1, 0x180);
711         if (ret < 0)
712                 return ret;
713 
714         if (!pdata)
715                 dev_warn(codec->dev, "No platform data supplied\n");
716         else {
717                 reg = snd_soc_read(codec, WM8940_OUTPUTCTL);
718                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
719                 if (ret < 0)
720                         return ret;
721         }
722 
723         return ret;
724 }
725 
726 static struct snd_soc_codec_driver soc_codec_dev_wm8940 = {
727         .probe =        wm8940_probe,
728         .set_bias_level = wm8940_set_bias_level,
729         .suspend_bias_off = true,
730 
731         .controls =     wm8940_snd_controls,
732         .num_controls = ARRAY_SIZE(wm8940_snd_controls),
733         .dapm_widgets = wm8940_dapm_widgets,
734         .num_dapm_widgets = ARRAY_SIZE(wm8940_dapm_widgets),
735         .dapm_routes =  wm8940_dapm_routes,
736         .num_dapm_routes = ARRAY_SIZE(wm8940_dapm_routes),
737 };
738 
739 static const struct regmap_config wm8940_regmap = {
740         .reg_bits = 8,
741         .val_bits = 16,
742 
743         .max_register = WM8940_MONOMIX,
744         .reg_defaults = wm8940_reg_defaults,
745         .num_reg_defaults = ARRAY_SIZE(wm8940_reg_defaults),
746         .cache_type = REGCACHE_RBTREE,
747 
748         .readable_reg = wm8940_readable_register,
749         .volatile_reg = wm8940_volatile_register,
750 };
751 
752 static int wm8940_i2c_probe(struct i2c_client *i2c,
753                             const struct i2c_device_id *id)
754 {
755         struct wm8940_priv *wm8940;
756         int ret;
757 
758         wm8940 = devm_kzalloc(&i2c->dev, sizeof(struct wm8940_priv),
759                               GFP_KERNEL);
760         if (wm8940 == NULL)
761                 return -ENOMEM;
762 
763         wm8940->regmap = devm_regmap_init_i2c(i2c, &wm8940_regmap);
764         if (IS_ERR(wm8940->regmap))
765                 return PTR_ERR(wm8940->regmap);
766 
767         i2c_set_clientdata(i2c, wm8940);
768 
769         ret = snd_soc_register_codec(&i2c->dev,
770                         &soc_codec_dev_wm8940, &wm8940_dai, 1);
771 
772         return ret;
773 }
774 
775 static int wm8940_i2c_remove(struct i2c_client *client)
776 {
777         snd_soc_unregister_codec(&client->dev);
778 
779         return 0;
780 }
781 
782 static const struct i2c_device_id wm8940_i2c_id[] = {
783         { "wm8940", 0 },
784         { }
785 };
786 MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);
787 
788 static struct i2c_driver wm8940_i2c_driver = {
789         .driver = {
790                 .name = "wm8940",
791         },
792         .probe =    wm8940_i2c_probe,
793         .remove =   wm8940_i2c_remove,
794         .id_table = wm8940_i2c_id,
795 };
796 
797 module_i2c_driver(wm8940_i2c_driver);
798 
799 MODULE_DESCRIPTION("ASoC WM8940 driver");
800 MODULE_AUTHOR("Jonathan Cameron");
801 MODULE_LICENSE("GPL");
802 

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