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14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/init.h>
17#include <linux/delay.h>
18#include <linux/pm.h>
19#include <linux/i2c.h>
20#include <linux/regmap.h>
21#include <linux/regulator/consumer.h>
22#include <linux/slab.h>
23#include <linux/of_device.h>
24#include <sound/core.h>
25#include <sound/pcm.h>
26#include <sound/pcm_params.h>
27#include <sound/soc.h>
28#include <sound/initval.h>
29#include <sound/tlv.h>
30
31#include "wm8523.h"
32
33#define WM8523_NUM_SUPPLIES 2
34static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = {
35 "AVDD",
36 "LINEVDD",
37};
38
39#define WM8523_NUM_RATES 7
40
41
42struct wm8523_priv {
43 struct regmap *regmap;
44 struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES];
45 unsigned int sysclk;
46 unsigned int rate_constraint_list[WM8523_NUM_RATES];
47 struct snd_pcm_hw_constraint_list rate_constraint;
48};
49
50static const struct reg_default wm8523_reg_defaults[] = {
51 { 2, 0x0000 },
52 { 3, 0x1812 },
53 { 4, 0x0000 },
54 { 5, 0x0001 },
55 { 6, 0x0190 },
56 { 7, 0x0190 },
57 { 8, 0x0000 },
58};
59
60static bool wm8523_volatile_register(struct device *dev, unsigned int reg)
61{
62 switch (reg) {
63 case WM8523_DEVICE_ID:
64 case WM8523_REVISION:
65 return true;
66 default:
67 return false;
68 }
69}
70
71static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0);
72
73static const char *wm8523_zd_count_text[] = {
74 "1024",
75 "2048",
76};
77
78static SOC_ENUM_SINGLE_DECL(wm8523_zc_count, WM8523_ZERO_DETECT, 0,
79 wm8523_zd_count_text);
80
81static const struct snd_kcontrol_new wm8523_controls[] = {
82SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR,
83 0, 448, 0, dac_tlv),
84SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0),
85SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0),
86SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1),
87SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0),
88SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0),
89SOC_ENUM("Zero Detect Count", wm8523_zc_count),
90};
91
92static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = {
93SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
94SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
95SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
96};
97
98static const struct snd_soc_dapm_route wm8523_dapm_routes[] = {
99 { "LINEVOUTL", NULL, "DAC" },
100 { "LINEVOUTR", NULL, "DAC" },
101};
102
103static struct {
104 int value;
105 int ratio;
106} lrclk_ratios[WM8523_NUM_RATES] = {
107 { 1, 128 },
108 { 2, 192 },
109 { 3, 256 },
110 { 4, 384 },
111 { 5, 512 },
112 { 6, 768 },
113 { 7, 1152 },
114};
115
116static struct {
117 int value;
118 int ratio;
119} bclk_ratios[WM8523_NUM_RATES] = {
120 { 2, 32 },
121 { 3, 64 },
122 { 4, 128 },
123};
124
125static int wm8523_startup(struct snd_pcm_substream *substream,
126 struct snd_soc_dai *dai)
127{
128 struct snd_soc_codec *codec = dai->codec;
129 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
130
131
132
133
134 if (!wm8523->sysclk) {
135 dev_err(codec->dev,
136 "No MCLK configured, call set_sysclk() on init\n");
137 return -EINVAL;
138 }
139
140 snd_pcm_hw_constraint_list(substream->runtime, 0,
141 SNDRV_PCM_HW_PARAM_RATE,
142 &wm8523->rate_constraint);
143
144 return 0;
145}
146
147static int wm8523_hw_params(struct snd_pcm_substream *substream,
148 struct snd_pcm_hw_params *params,
149 struct snd_soc_dai *dai)
150{
151 struct snd_soc_codec *codec = dai->codec;
152 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
153 int i;
154 u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
155 u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2);
156
157
158 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
159 if (wm8523->sysclk / params_rate(params) ==
160 lrclk_ratios[i].ratio)
161 break;
162 }
163
164
165 if (i == ARRAY_SIZE(lrclk_ratios)) {
166 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
167 wm8523->sysclk / params_rate(params));
168 return -EINVAL;
169 }
170
171 aifctrl2 &= ~WM8523_SR_MASK;
172 aifctrl2 |= lrclk_ratios[i].value;
173
174 if (aifctrl1 & WM8523_AIF_MSTR) {
175
176 for (i = 0; i < ARRAY_SIZE(bclk_ratios); i++)
177 if (params_width(params) * 2 <= bclk_ratios[i].ratio)
178 break;
179
180 if (i == ARRAY_SIZE(bclk_ratios)) {
181 dev_err(codec->dev,
182 "No matching BCLK/fs ratio for word length %d\n",
183 params_width(params));
184 return -EINVAL;
185 }
186
187 aifctrl2 &= ~WM8523_BCLKDIV_MASK;
188 aifctrl2 |= bclk_ratios[i].value << WM8523_BCLKDIV_SHIFT;
189 }
190
191 aifctrl1 &= ~WM8523_WL_MASK;
192 switch (params_width(params)) {
193 case 16:
194 break;
195 case 20:
196 aifctrl1 |= 0x8;
197 break;
198 case 24:
199 aifctrl1 |= 0x10;
200 break;
201 case 32:
202 aifctrl1 |= 0x18;
203 break;
204 }
205
206 snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
207 snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2);
208
209 return 0;
210}
211
212static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,
213 int clk_id, unsigned int freq, int dir)
214{
215 struct snd_soc_codec *codec = codec_dai->codec;
216 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
217 unsigned int val;
218 int i;
219
220 wm8523->sysclk = freq;
221
222 wm8523->rate_constraint.count = 0;
223 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
224 val = freq / lrclk_ratios[i].ratio;
225
226
227
228
229 switch (val) {
230 case 8000:
231 case 11025:
232 case 16000:
233 case 22050:
234 case 32000:
235 case 44100:
236 case 48000:
237 case 64000:
238 case 88200:
239 case 96000:
240 case 176400:
241 case 192000:
242 dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
243 val);
244 wm8523->rate_constraint_list[i] = val;
245 wm8523->rate_constraint.count++;
246 break;
247 default:
248 dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
249 val);
250 }
251 }
252
253
254 if (wm8523->rate_constraint.count == 0)
255 return -EINVAL;
256
257 return 0;
258}
259
260
261static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,
262 unsigned int fmt)
263{
264 struct snd_soc_codec *codec = codec_dai->codec;
265 u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
266
267 aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK |
268 WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK);
269
270 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
271 case SND_SOC_DAIFMT_CBM_CFM:
272 aifctrl1 |= WM8523_AIF_MSTR;
273 break;
274 case SND_SOC_DAIFMT_CBS_CFS:
275 break;
276 default:
277 return -EINVAL;
278 }
279
280 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
281 case SND_SOC_DAIFMT_I2S:
282 aifctrl1 |= 0x0002;
283 break;
284 case SND_SOC_DAIFMT_RIGHT_J:
285 break;
286 case SND_SOC_DAIFMT_LEFT_J:
287 aifctrl1 |= 0x0001;
288 break;
289 case SND_SOC_DAIFMT_DSP_A:
290 aifctrl1 |= 0x0003;
291 break;
292 case SND_SOC_DAIFMT_DSP_B:
293 aifctrl1 |= 0x0023;
294 break;
295 default:
296 return -EINVAL;
297 }
298
299 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
300 case SND_SOC_DAIFMT_NB_NF:
301 break;
302 case SND_SOC_DAIFMT_IB_IF:
303 aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV;
304 break;
305 case SND_SOC_DAIFMT_IB_NF:
306 aifctrl1 |= WM8523_BCLK_INV;
307 break;
308 case SND_SOC_DAIFMT_NB_IF:
309 aifctrl1 |= WM8523_LRCLK_INV;
310 break;
311 default:
312 return -EINVAL;
313 }
314
315 snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
316
317 return 0;
318}
319
320static int wm8523_set_bias_level(struct snd_soc_codec *codec,
321 enum snd_soc_bias_level level)
322{
323 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
324 int ret;
325
326 switch (level) {
327 case SND_SOC_BIAS_ON:
328 break;
329
330 case SND_SOC_BIAS_PREPARE:
331
332 snd_soc_update_bits(codec, WM8523_PSCTRL1,
333 WM8523_SYS_ENA_MASK, 3);
334 break;
335
336 case SND_SOC_BIAS_STANDBY:
337 if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
338 ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
339 wm8523->supplies);
340 if (ret != 0) {
341 dev_err(codec->dev,
342 "Failed to enable supplies: %d\n",
343 ret);
344 return ret;
345 }
346
347
348 regcache_sync(wm8523->regmap);
349
350
351 snd_soc_update_bits(codec, WM8523_PSCTRL1,
352 WM8523_SYS_ENA_MASK, 1);
353
354 msleep(100);
355 }
356
357
358 snd_soc_update_bits(codec, WM8523_PSCTRL1,
359 WM8523_SYS_ENA_MASK, 2);
360
361 break;
362
363 case SND_SOC_BIAS_OFF:
364
365 snd_soc_update_bits(codec, WM8523_PSCTRL1,
366 WM8523_SYS_ENA_MASK, 0);
367 msleep(100);
368
369 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),
370 wm8523->supplies);
371 break;
372 }
373 return 0;
374}
375
376#define WM8523_RATES SNDRV_PCM_RATE_8000_192000
377
378#define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
379 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
380
381static const struct snd_soc_dai_ops wm8523_dai_ops = {
382 .startup = wm8523_startup,
383 .hw_params = wm8523_hw_params,
384 .set_sysclk = wm8523_set_dai_sysclk,
385 .set_fmt = wm8523_set_dai_fmt,
386};
387
388static struct snd_soc_dai_driver wm8523_dai = {
389 .name = "wm8523-hifi",
390 .playback = {
391 .stream_name = "Playback",
392 .channels_min = 2,
393 .channels_max = 2,
394 .rates = WM8523_RATES,
395 .formats = WM8523_FORMATS,
396 },
397 .ops = &wm8523_dai_ops,
398};
399
400static int wm8523_probe(struct snd_soc_codec *codec)
401{
402 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
403
404 wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];
405 wm8523->rate_constraint.count =
406 ARRAY_SIZE(wm8523->rate_constraint_list);
407
408
409 snd_soc_update_bits(codec, WM8523_DAC_GAINR,
410 WM8523_DACR_VU, WM8523_DACR_VU);
411 snd_soc_update_bits(codec, WM8523_DAC_CTRL3, WM8523_ZC, WM8523_ZC);
412
413 return 0;
414}
415
416static struct snd_soc_codec_driver soc_codec_dev_wm8523 = {
417 .probe = wm8523_probe,
418 .set_bias_level = wm8523_set_bias_level,
419 .suspend_bias_off = true,
420
421 .controls = wm8523_controls,
422 .num_controls = ARRAY_SIZE(wm8523_controls),
423 .dapm_widgets = wm8523_dapm_widgets,
424 .num_dapm_widgets = ARRAY_SIZE(wm8523_dapm_widgets),
425 .dapm_routes = wm8523_dapm_routes,
426 .num_dapm_routes = ARRAY_SIZE(wm8523_dapm_routes),
427};
428
429static const struct of_device_id wm8523_of_match[] = {
430 { .compatible = "wlf,wm8523" },
431 { },
432};
433MODULE_DEVICE_TABLE(of, wm8523_of_match);
434
435static const struct regmap_config wm8523_regmap = {
436 .reg_bits = 8,
437 .val_bits = 16,
438 .max_register = WM8523_ZERO_DETECT,
439
440 .reg_defaults = wm8523_reg_defaults,
441 .num_reg_defaults = ARRAY_SIZE(wm8523_reg_defaults),
442 .cache_type = REGCACHE_RBTREE,
443
444 .volatile_reg = wm8523_volatile_register,
445};
446
447#if IS_ENABLED(CONFIG_I2C)
448static int wm8523_i2c_probe(struct i2c_client *i2c,
449 const struct i2c_device_id *id)
450{
451 struct wm8523_priv *wm8523;
452 unsigned int val;
453 int ret, i;
454
455 wm8523 = devm_kzalloc(&i2c->dev, sizeof(struct wm8523_priv),
456 GFP_KERNEL);
457 if (wm8523 == NULL)
458 return -ENOMEM;
459
460 wm8523->regmap = devm_regmap_init_i2c(i2c, &wm8523_regmap);
461 if (IS_ERR(wm8523->regmap)) {
462 ret = PTR_ERR(wm8523->regmap);
463 dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
464 return ret;
465 }
466
467 for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)
468 wm8523->supplies[i].supply = wm8523_supply_names[i];
469
470 ret = devm_regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8523->supplies),
471 wm8523->supplies);
472 if (ret != 0) {
473 dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret);
474 return ret;
475 }
476
477 ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
478 wm8523->supplies);
479 if (ret != 0) {
480 dev_err(&i2c->dev, "Failed to enable supplies: %d\n", ret);
481 return ret;
482 }
483
484 ret = regmap_read(wm8523->regmap, WM8523_DEVICE_ID, &val);
485 if (ret < 0) {
486 dev_err(&i2c->dev, "Failed to read ID register\n");
487 goto err_enable;
488 }
489 if (val != 0x8523) {
490 dev_err(&i2c->dev, "Device is not a WM8523, ID is %x\n", ret);
491 ret = -EINVAL;
492 goto err_enable;
493 }
494
495 ret = regmap_read(wm8523->regmap, WM8523_REVISION, &val);
496 if (ret < 0) {
497 dev_err(&i2c->dev, "Failed to read revision register\n");
498 goto err_enable;
499 }
500 dev_info(&i2c->dev, "revision %c\n",
501 (val & WM8523_CHIP_REV_MASK) + 'A');
502
503 ret = regmap_write(wm8523->regmap, WM8523_DEVICE_ID, 0x8523);
504 if (ret != 0) {
505 dev_err(&i2c->dev, "Failed to reset device: %d\n", ret);
506 goto err_enable;
507 }
508
509 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
510
511 i2c_set_clientdata(i2c, wm8523);
512
513 ret = snd_soc_register_codec(&i2c->dev,
514 &soc_codec_dev_wm8523, &wm8523_dai, 1);
515
516 return ret;
517
518err_enable:
519 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
520 return ret;
521}
522
523static int wm8523_i2c_remove(struct i2c_client *client)
524{
525 snd_soc_unregister_codec(&client->dev);
526 return 0;
527}
528
529static const struct i2c_device_id wm8523_i2c_id[] = {
530 { "wm8523", 0 },
531 { }
532};
533MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);
534
535static struct i2c_driver wm8523_i2c_driver = {
536 .driver = {
537 .name = "wm8523",
538 .of_match_table = wm8523_of_match,
539 },
540 .probe = wm8523_i2c_probe,
541 .remove = wm8523_i2c_remove,
542 .id_table = wm8523_i2c_id,
543};
544#endif
545
546static int __init wm8523_modinit(void)
547{
548 int ret;
549#if IS_ENABLED(CONFIG_I2C)
550 ret = i2c_add_driver(&wm8523_i2c_driver);
551 if (ret != 0) {
552 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n",
553 ret);
554 }
555#endif
556 return 0;
557}
558module_init(wm8523_modinit);
559
560static void __exit wm8523_exit(void)
561{
562#if IS_ENABLED(CONFIG_I2C)
563 i2c_del_driver(&wm8523_i2c_driver);
564#endif
565}
566module_exit(wm8523_exit);
567
568MODULE_DESCRIPTION("ASoC WM8523 driver");
569MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
570MODULE_LICENSE("GPL");
571
