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/spi/spi.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 enum snd_soc_control_type control_type;
45 };
46
wm8940_volatile_register(struct snd_soc_codec * codec,unsigned int reg)47 static int wm8940_volatile_register(struct snd_soc_codec *codec,
48 unsigned int reg)
49 {
50 switch (reg) {
51 case WM8940_SOFTRESET:
52 return 1;
53 default:
54 return 0;
55 }
56 }
57
58 static u16 wm8940_reg_defaults[] = {
59 0x8940, /* Soft Reset */
60 0x0000, /* Power 1 */
61 0x0000, /* Power 2 */
62 0x0000, /* Power 3 */
63 0x0010, /* Interface Control */
64 0x0000, /* Companding Control */
65 0x0140, /* Clock Control */
66 0x0000, /* Additional Controls */
67 0x0000, /* GPIO Control */
68 0x0002, /* Auto Increment Control */
69 0x0000, /* DAC Control */
70 0x00FF, /* DAC Volume */
71 0,
72 0,
73 0x0100, /* ADC Control */
74 0x00FF, /* ADC Volume */
75 0x0000, /* Notch Filter 1 Control 1 */
76 0x0000, /* Notch Filter 1 Control 2 */
77 0x0000, /* Notch Filter 2 Control 1 */
78 0x0000, /* Notch Filter 2 Control 2 */
79 0x0000, /* Notch Filter 3 Control 1 */
80 0x0000, /* Notch Filter 3 Control 2 */
81 0x0000, /* Notch Filter 4 Control 1 */
82 0x0000, /* Notch Filter 4 Control 2 */
83 0x0032, /* DAC Limit Control 1 */
84 0x0000, /* DAC Limit Control 2 */
85 0,
86 0,
87 0,
88 0,
89 0,
90 0,
91 0x0038, /* ALC Control 1 */
92 0x000B, /* ALC Control 2 */
93 0x0032, /* ALC Control 3 */
94 0x0000, /* Noise Gate */
95 0x0041, /* PLLN */
96 0x000C, /* PLLK1 */
97 0x0093, /* PLLK2 */
98 0x00E9, /* PLLK3 */
99 0,
100 0,
101 0x0030, /* ALC Control 4 */
102 0,
103 0x0002, /* Input Control */
104 0x0050, /* PGA Gain */
105 0,
106 0x0002, /* ADC Boost Control */
107 0,
108 0x0002, /* Output Control */
109 0x0000, /* Speaker Mixer Control */
110 0,
111 0,
112 0,
113 0x0079, /* Speaker Volume */
114 0,
115 0x0000, /* Mono Mixer Control */
116 };
117
118 static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
119 static const struct soc_enum wm8940_adc_companding_enum
120 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding);
121 static const struct soc_enum wm8940_dac_companding_enum
122 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding);
123
124 static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
125 static const struct soc_enum wm8940_alc_mode_enum
126 = SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text);
127
128 static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
129 static const struct soc_enum wm8940_mic_bias_level_enum
130 = SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text);
131
132 static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
133 static const struct soc_enum wm8940_filter_mode_enum
134 = SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text);
135
136 static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
137 static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
138 static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
139 static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
140 static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
141 static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
142 static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
143 static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
144 static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
145 static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);
146
147 static const struct snd_kcontrol_new wm8940_snd_controls[] = {
148 SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
149 6, 1, 0),
150 SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
151 SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),
152
153 SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
154 SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
155 SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
156 3, 7, 1, wm8940_alc_max_tlv),
157 SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
158 0, 7, 0, wm8940_alc_min_tlv),
159 SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
160 0, 14, 0, wm8940_alc_tar_tlv),
161 SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
162 SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
163 SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
164 SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
165 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
166 3, 1, 0),
167 SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
168 0, 7, 0),
169
170 SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
171 SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
172 SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
173 SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
174 4, 9, 1, wm8940_lim_thresh_tlv),
175 SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
176 0, 12, 0, wm8940_lim_boost_tlv),
177
178 SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
179 SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
180 0, 63, 0, wm8940_pga_vol_tlv),
181 SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
182 0, 255, 0, wm8940_adc_tlv),
183 SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
184 0, 255, 0, wm8940_adc_tlv),
185 SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
186 SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
187 8, 1, 0, wm8940_capture_boost_vol_tlv),
188 SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
189 0, 63, 0, wm8940_spk_vol_tlv),
190 SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL, 6, 1, 1),
191
192 SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
193 8, 1, 1, wm8940_att_tlv),
194 SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),
195
196 SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
197 SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
198 7, 1, 1, wm8940_att_tlv),
199
200 SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
201 SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
202 SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
203 SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
204 SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
205 SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
206 SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
207 };
208
209 static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
210 SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
211 SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
212 SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
213 };
214
215 static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
216 SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
217 SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
218 SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
219 };
220
221 static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
222 static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
223 SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
224 SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
225 0, 7, 0, wm8940_boost_vol_tlv),
226 SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
227 4, 7, 0, wm8940_boost_vol_tlv),
228 };
229
230 static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
231 SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
232 SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
233 SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
234 };
235
236 static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
237 SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
238 &wm8940_speaker_mixer_controls[0],
239 ARRAY_SIZE(wm8940_speaker_mixer_controls)),
240 SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
241 &wm8940_mono_mixer_controls[0],
242 ARRAY_SIZE(wm8940_mono_mixer_controls)),
243 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),
244
245 SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
246 SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
247 SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
248 SND_SOC_DAPM_OUTPUT("MONOOUT"),
249 SND_SOC_DAPM_OUTPUT("SPKOUTP"),
250 SND_SOC_DAPM_OUTPUT("SPKOUTN"),
251
252 SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
253 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
254 SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
255 &wm8940_micpga_controls[0],
256 ARRAY_SIZE(wm8940_micpga_controls)),
257 SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
258 &wm8940_input_boost_controls[0],
259 ARRAY_SIZE(wm8940_input_boost_controls)),
260 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),
261
262 SND_SOC_DAPM_INPUT("MICN"),
263 SND_SOC_DAPM_INPUT("MICP"),
264 SND_SOC_DAPM_INPUT("AUX"),
265 };
266
267 static const struct snd_soc_dapm_route audio_map[] = {
268 /* Mono output mixer */
269 {"Mono Mixer", "PCM Playback Switch", "DAC"},
270 {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
271 {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
272
273 /* Speaker output mixer */
274 {"Speaker Mixer", "PCM Playback Switch", "DAC"},
275 {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
276 {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
277
278 /* Outputs */
279 {"Mono Out", NULL, "Mono Mixer"},
280 {"MONOOUT", NULL, "Mono Out"},
281 {"SpkN Out", NULL, "Speaker Mixer"},
282 {"SpkP Out", NULL, "Speaker Mixer"},
283 {"SPKOUTN", NULL, "SpkN Out"},
284 {"SPKOUTP", NULL, "SpkP Out"},
285
286 /* Microphone PGA */
287 {"Mic PGA", "MICN Switch", "MICN"},
288 {"Mic PGA", "MICP Switch", "MICP"},
289 {"Mic PGA", "AUX Switch", "AUX"},
290
291 /* Boost Mixer */
292 {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
293 {"Boost Mixer", "Mic Volume", "MICP"},
294 {"Boost Mixer", "Aux Volume", "Aux Input"},
295
296 {"ADC", NULL, "Boost Mixer"},
297 };
298
wm8940_add_widgets(struct snd_soc_codec * codec)299 static int wm8940_add_widgets(struct snd_soc_codec *codec)
300 {
301 struct snd_soc_dapm_context *dapm = &codec->dapm;
302 int ret;
303
304 ret = snd_soc_dapm_new_controls(dapm, wm8940_dapm_widgets,
305 ARRAY_SIZE(wm8940_dapm_widgets));
306 if (ret)
307 goto error_ret;
308 ret = snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
309
310 error_ret:
311 return ret;
312 }
313
314 #define wm8940_reset(c) snd_soc_write(c, WM8940_SOFTRESET, 0);
315
wm8940_set_dai_fmt(struct snd_soc_dai * codec_dai,unsigned int fmt)316 static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
317 unsigned int fmt)
318 {
319 struct snd_soc_codec *codec = codec_dai->codec;
320 u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFE67;
321 u16 clk = snd_soc_read(codec, WM8940_CLOCK) & 0x1fe;
322
323 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
324 case SND_SOC_DAIFMT_CBM_CFM:
325 clk |= 1;
326 break;
327 case SND_SOC_DAIFMT_CBS_CFS:
328 break;
329 default:
330 return -EINVAL;
331 }
332 snd_soc_write(codec, WM8940_CLOCK, clk);
333
334 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
335 case SND_SOC_DAIFMT_I2S:
336 iface |= (2 << 3);
337 break;
338 case SND_SOC_DAIFMT_LEFT_J:
339 iface |= (1 << 3);
340 break;
341 case SND_SOC_DAIFMT_RIGHT_J:
342 break;
343 case SND_SOC_DAIFMT_DSP_A:
344 iface |= (3 << 3);
345 break;
346 case SND_SOC_DAIFMT_DSP_B:
347 iface |= (3 << 3) | (1 << 7);
348 break;
349 }
350
351 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
352 case SND_SOC_DAIFMT_NB_NF:
353 break;
354 case SND_SOC_DAIFMT_NB_IF:
355 iface |= (1 << 7);
356 break;
357 case SND_SOC_DAIFMT_IB_NF:
358 iface |= (1 << 8);
359 break;
360 case SND_SOC_DAIFMT_IB_IF:
361 iface |= (1 << 8) | (1 << 7);
362 break;
363 }
364
365 snd_soc_write(codec, WM8940_IFACE, iface);
366
367 return 0;
368 }
369
wm8940_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)370 static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
371 struct snd_pcm_hw_params *params,
372 struct snd_soc_dai *dai)
373 {
374 struct snd_soc_pcm_runtime *rtd = substream->private_data;
375 struct snd_soc_codec *codec = rtd->codec;
376 u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F;
377 u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1;
378 u16 companding = snd_soc_read(codec,
379 WM8940_COMPANDINGCTL) & 0xFFDF;
380 int ret;
381
382 /* LoutR control */
383 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
384 && params_channels(params) == 2)
385 iface |= (1 << 9);
386
387 switch (params_rate(params)) {
388 case 8000:
389 addcntrl |= (0x5 << 1);
390 break;
391 case 11025:
392 addcntrl |= (0x4 << 1);
393 break;
394 case 16000:
395 addcntrl |= (0x3 << 1);
396 break;
397 case 22050:
398 addcntrl |= (0x2 << 1);
399 break;
400 case 32000:
401 addcntrl |= (0x1 << 1);
402 break;
403 case 44100:
404 case 48000:
405 break;
406 }
407 ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl);
408 if (ret)
409 goto error_ret;
410
411 switch (params_format(params)) {
412 case SNDRV_PCM_FORMAT_S8:
413 companding = companding | (1 << 5);
414 break;
415 case SNDRV_PCM_FORMAT_S16_LE:
416 break;
417 case SNDRV_PCM_FORMAT_S20_3LE:
418 iface |= (1 << 5);
419 break;
420 case SNDRV_PCM_FORMAT_S24_LE:
421 iface |= (2 << 5);
422 break;
423 case SNDRV_PCM_FORMAT_S32_LE:
424 iface |= (3 << 5);
425 break;
426 }
427 ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding);
428 if (ret)
429 goto error_ret;
430 ret = snd_soc_write(codec, WM8940_IFACE, iface);
431
432 error_ret:
433 return ret;
434 }
435
wm8940_mute(struct snd_soc_dai * dai,int mute)436 static int wm8940_mute(struct snd_soc_dai *dai, int mute)
437 {
438 struct snd_soc_codec *codec = dai->codec;
439 u16 mute_reg = snd_soc_read(codec, WM8940_DAC) & 0xffbf;
440
441 if (mute)
442 mute_reg |= 0x40;
443
444 return snd_soc_write(codec, WM8940_DAC, mute_reg);
445 }
446
wm8940_set_bias_level(struct snd_soc_codec * codec,enum snd_soc_bias_level level)447 static int wm8940_set_bias_level(struct snd_soc_codec *codec,
448 enum snd_soc_bias_level level)
449 {
450 u16 val;
451 u16 pwr_reg = snd_soc_read(codec, WM8940_POWER1) & 0x1F0;
452 int ret = 0;
453
454 switch (level) {
455 case SND_SOC_BIAS_ON:
456 /* ensure bufioen and biasen */
457 pwr_reg |= (1 << 2) | (1 << 3);
458 /* Enable thermal shutdown */
459 val = snd_soc_read(codec, WM8940_OUTPUTCTL);
460 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, val | 0x2);
461 if (ret)
462 break;
463 /* set vmid to 75k */
464 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
465 break;
466 case SND_SOC_BIAS_PREPARE:
467 /* ensure bufioen and biasen */
468 pwr_reg |= (1 << 2) | (1 << 3);
469 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
470 break;
471 case SND_SOC_BIAS_STANDBY:
472 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
473 ret = snd_soc_cache_sync(codec);
474 if (ret < 0) {
475 dev_err(codec->dev, "Failed to sync cache: %d\n", ret);
476 return ret;
477 }
478 }
479
480 /* ensure bufioen and biasen */
481 pwr_reg |= (1 << 2) | (1 << 3);
482 /* set vmid to 300k for standby */
483 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x2);
484 break;
485 case SND_SOC_BIAS_OFF:
486 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg);
487 break;
488 }
489
490 codec->dapm.bias_level = level;
491
492 return ret;
493 }
494
495 struct pll_ {
496 unsigned int pre_scale:2;
497 unsigned int n:4;
498 unsigned int k;
499 };
500
501 static struct pll_ pll_div;
502
503 /* The size in bits of the pll divide multiplied by 10
504 * to allow rounding later */
505 #define FIXED_PLL_SIZE ((1 << 24) * 10)
pll_factors(unsigned int target,unsigned int source)506 static void pll_factors(unsigned int target, unsigned int source)
507 {
508 unsigned long long Kpart;
509 unsigned int K, Ndiv, Nmod;
510 /* The left shift ist to avoid accuracy loss when right shifting */
511 Ndiv = target / source;
512
513 if (Ndiv > 12) {
514 source <<= 1;
515 /* Multiply by 2 */
516 pll_div.pre_scale = 0;
517 Ndiv = target / source;
518 } else if (Ndiv < 3) {
519 source >>= 2;
520 /* Divide by 4 */
521 pll_div.pre_scale = 3;
522 Ndiv = target / source;
523 } else if (Ndiv < 6) {
524 source >>= 1;
525 /* divide by 2 */
526 pll_div.pre_scale = 2;
527 Ndiv = target / source;
528 } else
529 pll_div.pre_scale = 1;
530
531 if ((Ndiv < 6) || (Ndiv > 12))
532 printk(KERN_WARNING
533 "WM8940 N value %d outwith recommended range!d\n",
534 Ndiv);
535
536 pll_div.n = Ndiv;
537 Nmod = target % source;
538 Kpart = FIXED_PLL_SIZE * (long long)Nmod;
539
540 do_div(Kpart, source);
541
542 K = Kpart & 0xFFFFFFFF;
543
544 /* Check if we need to round */
545 if ((K % 10) >= 5)
546 K += 5;
547
548 /* Move down to proper range now rounding is done */
549 K /= 10;
550
551 pll_div.k = K;
552 }
553
554 /* Untested at the moment */
wm8940_set_dai_pll(struct snd_soc_dai * codec_dai,int pll_id,int source,unsigned int freq_in,unsigned int freq_out)555 static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
556 int source, unsigned int freq_in, unsigned int freq_out)
557 {
558 struct snd_soc_codec *codec = codec_dai->codec;
559 u16 reg;
560
561 /* Turn off PLL */
562 reg = snd_soc_read(codec, WM8940_POWER1);
563 snd_soc_write(codec, WM8940_POWER1, reg & 0x1df);
564
565 if (freq_in == 0 || freq_out == 0) {
566 /* Clock CODEC directly from MCLK */
567 reg = snd_soc_read(codec, WM8940_CLOCK);
568 snd_soc_write(codec, WM8940_CLOCK, reg & 0x0ff);
569 /* Pll power down */
570 snd_soc_write(codec, WM8940_PLLN, (1 << 7));
571 return 0;
572 }
573
574 /* Pll is followed by a frequency divide by 4 */
575 pll_factors(freq_out*4, freq_in);
576 if (pll_div.k)
577 snd_soc_write(codec, WM8940_PLLN,
578 (pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
579 else /* No factional component */
580 snd_soc_write(codec, WM8940_PLLN,
581 (pll_div.pre_scale << 4) | pll_div.n);
582 snd_soc_write(codec, WM8940_PLLK1, pll_div.k >> 18);
583 snd_soc_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
584 snd_soc_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff);
585 /* Enable the PLL */
586 reg = snd_soc_read(codec, WM8940_POWER1);
587 snd_soc_write(codec, WM8940_POWER1, reg | 0x020);
588
589 /* Run CODEC from PLL instead of MCLK */
590 reg = snd_soc_read(codec, WM8940_CLOCK);
591 snd_soc_write(codec, WM8940_CLOCK, reg | 0x100);
592
593 return 0;
594 }
595
wm8940_set_dai_sysclk(struct snd_soc_dai * codec_dai,int clk_id,unsigned int freq,int dir)596 static int wm8940_set_dai_sysclk(struct snd_soc_dai *codec_dai,
597 int clk_id, unsigned int freq, int dir)
598 {
599 struct snd_soc_codec *codec = codec_dai->codec;
600 struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
601
602 switch (freq) {
603 case 11289600:
604 case 12000000:
605 case 12288000:
606 case 16934400:
607 case 18432000:
608 wm8940->sysclk = freq;
609 return 0;
610 }
611 return -EINVAL;
612 }
613
wm8940_set_dai_clkdiv(struct snd_soc_dai * codec_dai,int div_id,int div)614 static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
615 int div_id, int div)
616 {
617 struct snd_soc_codec *codec = codec_dai->codec;
618 u16 reg;
619 int ret = 0;
620
621 switch (div_id) {
622 case WM8940_BCLKDIV:
623 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFE3;
624 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2));
625 break;
626 case WM8940_MCLKDIV:
627 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFF1F;
628 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 5));
629 break;
630 case WM8940_OPCLKDIV:
631 reg = snd_soc_read(codec, WM8940_GPIO) & 0xFFCF;
632 ret = snd_soc_write(codec, WM8940_GPIO, reg | (div << 4));
633 break;
634 }
635 return ret;
636 }
637
638 #define WM8940_RATES SNDRV_PCM_RATE_8000_48000
639
640 #define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
641 SNDRV_PCM_FMTBIT_S16_LE | \
642 SNDRV_PCM_FMTBIT_S20_3LE | \
643 SNDRV_PCM_FMTBIT_S24_LE | \
644 SNDRV_PCM_FMTBIT_S32_LE)
645
646 static const struct snd_soc_dai_ops wm8940_dai_ops = {
647 .hw_params = wm8940_i2s_hw_params,
648 .set_sysclk = wm8940_set_dai_sysclk,
649 .digital_mute = wm8940_mute,
650 .set_fmt = wm8940_set_dai_fmt,
651 .set_clkdiv = wm8940_set_dai_clkdiv,
652 .set_pll = wm8940_set_dai_pll,
653 };
654
655 static struct snd_soc_dai_driver wm8940_dai = {
656 .name = "wm8940-hifi",
657 .playback = {
658 .stream_name = "Playback",
659 .channels_min = 1,
660 .channels_max = 2,
661 .rates = WM8940_RATES,
662 .formats = WM8940_FORMATS,
663 },
664 .capture = {
665 .stream_name = "Capture",
666 .channels_min = 1,
667 .channels_max = 2,
668 .rates = WM8940_RATES,
669 .formats = WM8940_FORMATS,
670 },
671 .ops = &wm8940_dai_ops,
672 .symmetric_rates = 1,
673 };
674
wm8940_suspend(struct snd_soc_codec * codec)675 static int wm8940_suspend(struct snd_soc_codec *codec)
676 {
677 return wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
678 }
679
wm8940_resume(struct snd_soc_codec * codec)680 static int wm8940_resume(struct snd_soc_codec *codec)
681 {
682 wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
683 return 0;
684 }
685
wm8940_probe(struct snd_soc_codec * codec)686 static int wm8940_probe(struct snd_soc_codec *codec)
687 {
688 struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
689 struct wm8940_setup_data *pdata = codec->dev->platform_data;
690 int ret;
691 u16 reg;
692
693 ret = snd_soc_codec_set_cache_io(codec, 8, 16, wm8940->control_type);
694 if (ret < 0) {
695 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
696 return ret;
697 }
698
699 ret = wm8940_reset(codec);
700 if (ret < 0) {
701 dev_err(codec->dev, "Failed to issue reset\n");
702 return ret;
703 }
704
705 wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
706
707 ret = snd_soc_write(codec, WM8940_POWER1, 0x180);
708 if (ret < 0)
709 return ret;
710
711 if (!pdata)
712 dev_warn(codec->dev, "No platform data supplied\n");
713 else {
714 reg = snd_soc_read(codec, WM8940_OUTPUTCTL);
715 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
716 if (ret < 0)
717 return ret;
718 }
719
720 ret = snd_soc_add_codec_controls(codec, wm8940_snd_controls,
721 ARRAY_SIZE(wm8940_snd_controls));
722 if (ret)
723 return ret;
724 ret = wm8940_add_widgets(codec);
725 return ret;
726 }
727
wm8940_remove(struct snd_soc_codec * codec)728 static int wm8940_remove(struct snd_soc_codec *codec)
729 {
730 wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
731 return 0;
732 }
733
734 static struct snd_soc_codec_driver soc_codec_dev_wm8940 = {
735 .probe = wm8940_probe,
736 .remove = wm8940_remove,
737 .suspend = wm8940_suspend,
738 .resume = wm8940_resume,
739 .set_bias_level = wm8940_set_bias_level,
740 .reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults),
741 .reg_word_size = sizeof(u16),
742 .reg_cache_default = wm8940_reg_defaults,
743 .volatile_register = wm8940_volatile_register,
744 };
745
wm8940_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)746 static __devinit int wm8940_i2c_probe(struct i2c_client *i2c,
747 const struct i2c_device_id *id)
748 {
749 struct wm8940_priv *wm8940;
750 int ret;
751
752 wm8940 = devm_kzalloc(&i2c->dev, sizeof(struct wm8940_priv),
753 GFP_KERNEL);
754 if (wm8940 == NULL)
755 return -ENOMEM;
756
757 i2c_set_clientdata(i2c, wm8940);
758 wm8940->control_type = SND_SOC_I2C;
759
760 ret = snd_soc_register_codec(&i2c->dev,
761 &soc_codec_dev_wm8940, &wm8940_dai, 1);
762
763 return ret;
764 }
765
wm8940_i2c_remove(struct i2c_client * client)766 static __devexit int wm8940_i2c_remove(struct i2c_client *client)
767 {
768 snd_soc_unregister_codec(&client->dev);
769
770 return 0;
771 }
772
773 static const struct i2c_device_id wm8940_i2c_id[] = {
774 { "wm8940", 0 },
775 { }
776 };
777 MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);
778
779 static struct i2c_driver wm8940_i2c_driver = {
780 .driver = {
781 .name = "wm8940",
782 .owner = THIS_MODULE,
783 },
784 .probe = wm8940_i2c_probe,
785 .remove = __devexit_p(wm8940_i2c_remove),
786 .id_table = wm8940_i2c_id,
787 };
788
wm8940_modinit(void)789 static int __init wm8940_modinit(void)
790 {
791 int ret = 0;
792 ret = i2c_add_driver(&wm8940_i2c_driver);
793 if (ret != 0) {
794 printk(KERN_ERR "Failed to register wm8940 I2C driver: %d\n",
795 ret);
796 }
797 return ret;
798 }
799 module_init(wm8940_modinit);
800
wm8940_exit(void)801 static void __exit wm8940_exit(void)
802 {
803 i2c_del_driver(&wm8940_i2c_driver);
804 }
805 module_exit(wm8940_exit);
806
807 MODULE_DESCRIPTION("ASoC WM8940 driver");
808 MODULE_AUTHOR("Jonathan Cameron");
809 MODULE_LICENSE("GPL");
810