1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * wm8804.c -- WM8804 S/PDIF transceiver driver
4 *
5 * Copyright 2010-11 Wolfson Microelectronics plc
6 *
7 * Author: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/moduleparam.h>
12 #include <linux/init.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/delay.h>
15 #include <linux/pm.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/of_device.h>
18 #include <linux/regulator/consumer.h>
19 #include <linux/slab.h>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/pcm_params.h>
23 #include <sound/soc.h>
24 #include <sound/initval.h>
25 #include <sound/tlv.h>
26 #include <sound/soc-dapm.h>
27
28 #include "wm8804.h"
29
30 #define WM8804_NUM_SUPPLIES 2
31 static const char *wm8804_supply_names[WM8804_NUM_SUPPLIES] = {
32 "PVDD",
33 "DVDD"
34 };
35
36 static const struct reg_default wm8804_reg_defaults[] = {
37 { 3, 0x21 }, /* R3 - PLL1 */
38 { 4, 0xFD }, /* R4 - PLL2 */
39 { 5, 0x36 }, /* R5 - PLL3 */
40 { 6, 0x07 }, /* R6 - PLL4 */
41 { 7, 0x16 }, /* R7 - PLL5 */
42 { 8, 0x18 }, /* R8 - PLL6 */
43 { 9, 0xFF }, /* R9 - SPDMODE */
44 { 10, 0x00 }, /* R10 - INTMASK */
45 { 18, 0x00 }, /* R18 - SPDTX1 */
46 { 19, 0x00 }, /* R19 - SPDTX2 */
47 { 20, 0x00 }, /* R20 - SPDTX3 */
48 { 21, 0x71 }, /* R21 - SPDTX4 */
49 { 22, 0x0B }, /* R22 - SPDTX5 */
50 { 23, 0x70 }, /* R23 - GPO0 */
51 { 24, 0x57 }, /* R24 - GPO1 */
52 { 26, 0x42 }, /* R26 - GPO2 */
53 { 27, 0x06 }, /* R27 - AIFTX */
54 { 28, 0x06 }, /* R28 - AIFRX */
55 { 29, 0x80 }, /* R29 - SPDRX1 */
56 { 30, 0x07 }, /* R30 - PWRDN */
57 };
58
59 struct wm8804_priv {
60 struct device *dev;
61 struct regmap *regmap;
62 struct regulator_bulk_data supplies[WM8804_NUM_SUPPLIES];
63 struct notifier_block disable_nb[WM8804_NUM_SUPPLIES];
64 int mclk_div;
65
66 struct gpio_desc *reset;
67
68 int aif_pwr;
69 };
70
71 static int txsrc_put(struct snd_kcontrol *kcontrol,
72 struct snd_ctl_elem_value *ucontrol);
73
74 static int wm8804_aif_event(struct snd_soc_dapm_widget *w,
75 struct snd_kcontrol *kcontrol, int event);
76
77 /*
78 * We can't use the same notifier block for more than one supply and
79 * there's no way I can see to get from a callback to the caller
80 * except container_of().
81 */
82 #define WM8804_REGULATOR_EVENT(n) \
83 static int wm8804_regulator_event_##n(struct notifier_block *nb, \
84 unsigned long event, void *data) \
85 { \
86 struct wm8804_priv *wm8804 = container_of(nb, struct wm8804_priv, \
87 disable_nb[n]); \
88 if (event & REGULATOR_EVENT_DISABLE) { \
89 regcache_mark_dirty(wm8804->regmap); \
90 } \
91 return 0; \
92 }
93
94 WM8804_REGULATOR_EVENT(0)
95 WM8804_REGULATOR_EVENT(1)
96
97 static const char *txsrc_text[] = { "S/PDIF RX", "AIF" };
98 static SOC_ENUM_SINGLE_DECL(txsrc, WM8804_SPDTX4, 6, txsrc_text);
99
100 static const struct snd_kcontrol_new wm8804_tx_source_mux[] = {
101 SOC_DAPM_ENUM_EXT("Input Source", txsrc,
102 snd_soc_dapm_get_enum_double, txsrc_put),
103 };
104
105 static const struct snd_soc_dapm_widget wm8804_dapm_widgets[] = {
106 SND_SOC_DAPM_OUTPUT("SPDIF Out"),
107 SND_SOC_DAPM_INPUT("SPDIF In"),
108
109 SND_SOC_DAPM_PGA("SPDIFTX", WM8804_PWRDN, 2, 1, NULL, 0),
110 SND_SOC_DAPM_PGA("SPDIFRX", WM8804_PWRDN, 1, 1, NULL, 0),
111
112 SND_SOC_DAPM_MUX("Tx Source", SND_SOC_NOPM, 6, 0, wm8804_tx_source_mux),
113
114 SND_SOC_DAPM_AIF_OUT_E("AIFTX", NULL, 0, SND_SOC_NOPM, 0, 0, wm8804_aif_event,
115 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
116 SND_SOC_DAPM_AIF_IN_E("AIFRX", NULL, 0, SND_SOC_NOPM, 0, 0, wm8804_aif_event,
117 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
118 };
119
120 static const struct snd_soc_dapm_route wm8804_dapm_routes[] = {
121 { "AIFRX", NULL, "Playback" },
122 { "Tx Source", "AIF", "AIFRX" },
123
124 { "SPDIFRX", NULL, "SPDIF In" },
125 { "Tx Source", "S/PDIF RX", "SPDIFRX" },
126
127 { "SPDIFTX", NULL, "Tx Source" },
128 { "SPDIF Out", NULL, "SPDIFTX" },
129
130 { "AIFTX", NULL, "SPDIFRX" },
131 { "Capture", NULL, "AIFTX" },
132 };
133
wm8804_aif_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kcontrol,int event)134 static int wm8804_aif_event(struct snd_soc_dapm_widget *w,
135 struct snd_kcontrol *kcontrol, int event)
136 {
137 struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
138 struct wm8804_priv *wm8804 = snd_soc_component_get_drvdata(component);
139
140 switch (event) {
141 case SND_SOC_DAPM_POST_PMU:
142 /* power up the aif */
143 if (!wm8804->aif_pwr)
144 snd_soc_component_update_bits(component, WM8804_PWRDN, 0x10, 0x0);
145 wm8804->aif_pwr++;
146 break;
147 case SND_SOC_DAPM_POST_PMD:
148 /* power down only both paths are disabled */
149 wm8804->aif_pwr--;
150 if (!wm8804->aif_pwr)
151 snd_soc_component_update_bits(component, WM8804_PWRDN, 0x10, 0x10);
152 break;
153 }
154
155 return 0;
156 }
157
txsrc_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)158 static int txsrc_put(struct snd_kcontrol *kcontrol,
159 struct snd_ctl_elem_value *ucontrol)
160 {
161 struct snd_soc_component *component = snd_soc_dapm_kcontrol_component(kcontrol);
162 struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
163 struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
164 unsigned int val = ucontrol->value.enumerated.item[0] << e->shift_l;
165 unsigned int mask = 1 << e->shift_l;
166 unsigned int txpwr;
167
168 if (val != 0 && val != mask)
169 return -EINVAL;
170
171 snd_soc_dapm_mutex_lock(dapm);
172
173 if (snd_soc_component_test_bits(component, e->reg, mask, val)) {
174 /* save the current power state of the transmitter */
175 txpwr = snd_soc_component_read(component, WM8804_PWRDN) & 0x4;
176
177 /* power down the transmitter */
178 snd_soc_component_update_bits(component, WM8804_PWRDN, 0x4, 0x4);
179
180 /* set the tx source */
181 snd_soc_component_update_bits(component, e->reg, mask, val);
182
183 /* restore the transmitter's configuration */
184 snd_soc_component_update_bits(component, WM8804_PWRDN, 0x4, txpwr);
185 }
186
187 snd_soc_dapm_mutex_unlock(dapm);
188
189 return 0;
190 }
191
wm8804_volatile(struct device * dev,unsigned int reg)192 static bool wm8804_volatile(struct device *dev, unsigned int reg)
193 {
194 switch (reg) {
195 case WM8804_RST_DEVID1:
196 case WM8804_DEVID2:
197 case WM8804_DEVREV:
198 case WM8804_INTSTAT:
199 case WM8804_SPDSTAT:
200 case WM8804_RXCHAN1:
201 case WM8804_RXCHAN2:
202 case WM8804_RXCHAN3:
203 case WM8804_RXCHAN4:
204 case WM8804_RXCHAN5:
205 return true;
206 default:
207 return false;
208 }
209 }
210
wm8804_soft_reset(struct wm8804_priv * wm8804)211 static int wm8804_soft_reset(struct wm8804_priv *wm8804)
212 {
213 return regmap_write(wm8804->regmap, WM8804_RST_DEVID1, 0x0);
214 }
215
wm8804_set_fmt(struct snd_soc_dai * dai,unsigned int fmt)216 static int wm8804_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
217 {
218 struct snd_soc_component *component;
219 u16 format, master, bcp, lrp;
220
221 component = dai->component;
222
223 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
224 case SND_SOC_DAIFMT_I2S:
225 format = 0x2;
226 break;
227 case SND_SOC_DAIFMT_RIGHT_J:
228 format = 0x0;
229 break;
230 case SND_SOC_DAIFMT_LEFT_J:
231 format = 0x1;
232 break;
233 case SND_SOC_DAIFMT_DSP_A:
234 case SND_SOC_DAIFMT_DSP_B:
235 format = 0x3;
236 break;
237 default:
238 dev_err(dai->dev, "Unknown dai format\n");
239 return -EINVAL;
240 }
241
242 /* set data format */
243 snd_soc_component_update_bits(component, WM8804_AIFTX, 0x3, format);
244 snd_soc_component_update_bits(component, WM8804_AIFRX, 0x3, format);
245
246 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
247 case SND_SOC_DAIFMT_CBM_CFM:
248 master = 1;
249 break;
250 case SND_SOC_DAIFMT_CBS_CFS:
251 master = 0;
252 break;
253 default:
254 dev_err(dai->dev, "Unknown master/slave configuration\n");
255 return -EINVAL;
256 }
257
258 /* set master/slave mode */
259 snd_soc_component_update_bits(component, WM8804_AIFRX, 0x40, master << 6);
260
261 bcp = lrp = 0;
262 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
263 case SND_SOC_DAIFMT_NB_NF:
264 break;
265 case SND_SOC_DAIFMT_IB_IF:
266 bcp = lrp = 1;
267 break;
268 case SND_SOC_DAIFMT_IB_NF:
269 bcp = 1;
270 break;
271 case SND_SOC_DAIFMT_NB_IF:
272 lrp = 1;
273 break;
274 default:
275 dev_err(dai->dev, "Unknown polarity configuration\n");
276 return -EINVAL;
277 }
278
279 /* set frame inversion */
280 snd_soc_component_update_bits(component, WM8804_AIFTX, 0x10 | 0x20,
281 (bcp << 4) | (lrp << 5));
282 snd_soc_component_update_bits(component, WM8804_AIFRX, 0x10 | 0x20,
283 (bcp << 4) | (lrp << 5));
284 return 0;
285 }
286
wm8804_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)287 static int wm8804_hw_params(struct snd_pcm_substream *substream,
288 struct snd_pcm_hw_params *params,
289 struct snd_soc_dai *dai)
290 {
291 struct snd_soc_component *component;
292 u16 blen;
293
294 component = dai->component;
295
296 switch (params_width(params)) {
297 case 16:
298 blen = 0x0;
299 break;
300 case 20:
301 blen = 0x1;
302 break;
303 case 24:
304 blen = 0x2;
305 break;
306 default:
307 dev_err(dai->dev, "Unsupported word length: %u\n",
308 params_width(params));
309 return -EINVAL;
310 }
311
312 /* set word length */
313 snd_soc_component_update_bits(component, WM8804_AIFTX, 0xc, blen << 2);
314 snd_soc_component_update_bits(component, WM8804_AIFRX, 0xc, blen << 2);
315
316 return 0;
317 }
318
319 struct pll_div {
320 u32 prescale:1;
321 u32 mclkdiv:1;
322 u32 freqmode:2;
323 u32 n:4;
324 u32 k:22;
325 };
326
327 /* PLL rate to output rate divisions */
328 static struct {
329 unsigned int div;
330 unsigned int freqmode;
331 unsigned int mclkdiv;
332 } post_table[] = {
333 { 2, 0, 0 },
334 { 4, 0, 1 },
335 { 4, 1, 0 },
336 { 8, 1, 1 },
337 { 8, 2, 0 },
338 { 16, 2, 1 },
339 { 12, 3, 0 },
340 { 24, 3, 1 }
341 };
342
343 #define FIXED_PLL_SIZE ((1ULL << 22) * 10)
pll_factors(struct pll_div * pll_div,unsigned int target,unsigned int source,unsigned int mclk_div)344 static int pll_factors(struct pll_div *pll_div, unsigned int target,
345 unsigned int source, unsigned int mclk_div)
346 {
347 u64 Kpart;
348 unsigned long int K, Ndiv, Nmod, tmp;
349 int i;
350
351 /*
352 * Scale the output frequency up; the PLL should run in the
353 * region of 90-100MHz.
354 */
355 for (i = 0; i < ARRAY_SIZE(post_table); i++) {
356 tmp = target * post_table[i].div;
357 if ((tmp >= 90000000 && tmp <= 100000000) &&
358 (mclk_div == post_table[i].mclkdiv)) {
359 pll_div->freqmode = post_table[i].freqmode;
360 pll_div->mclkdiv = post_table[i].mclkdiv;
361 target *= post_table[i].div;
362 break;
363 }
364 }
365
366 if (i == ARRAY_SIZE(post_table)) {
367 pr_err("%s: Unable to scale output frequency: %uHz\n",
368 __func__, target);
369 return -EINVAL;
370 }
371
372 pll_div->prescale = 0;
373 Ndiv = target / source;
374 if (Ndiv < 5) {
375 source >>= 1;
376 pll_div->prescale = 1;
377 Ndiv = target / source;
378 }
379
380 if (Ndiv < 5 || Ndiv > 13) {
381 pr_err("%s: WM8804 N value is not within the recommended range: %lu\n",
382 __func__, Ndiv);
383 return -EINVAL;
384 }
385 pll_div->n = Ndiv;
386
387 Nmod = target % source;
388 Kpart = FIXED_PLL_SIZE * (u64)Nmod;
389
390 do_div(Kpart, source);
391
392 K = Kpart & 0xffffffff;
393 if ((K % 10) >= 5)
394 K += 5;
395 K /= 10;
396 pll_div->k = K;
397
398 return 0;
399 }
400
wm8804_set_pll(struct snd_soc_dai * dai,int pll_id,int source,unsigned int freq_in,unsigned int freq_out)401 static int wm8804_set_pll(struct snd_soc_dai *dai, int pll_id,
402 int source, unsigned int freq_in,
403 unsigned int freq_out)
404 {
405 struct snd_soc_component *component = dai->component;
406 struct wm8804_priv *wm8804 = snd_soc_component_get_drvdata(component);
407 bool change;
408
409 if (!freq_in || !freq_out) {
410 /* disable the PLL */
411 regmap_update_bits_check(wm8804->regmap, WM8804_PWRDN,
412 0x1, 0x1, &change);
413 if (change)
414 pm_runtime_put(wm8804->dev);
415 } else {
416 int ret;
417 struct pll_div pll_div;
418
419 ret = pll_factors(&pll_div, freq_out, freq_in,
420 wm8804->mclk_div);
421 if (ret)
422 return ret;
423
424 /* power down the PLL before reprogramming it */
425 regmap_update_bits_check(wm8804->regmap, WM8804_PWRDN,
426 0x1, 0x1, &change);
427 if (!change)
428 pm_runtime_get_sync(wm8804->dev);
429
430 /* set PLLN and PRESCALE */
431 snd_soc_component_update_bits(component, WM8804_PLL4, 0xf | 0x10,
432 pll_div.n | (pll_div.prescale << 4));
433 /* set mclkdiv and freqmode */
434 snd_soc_component_update_bits(component, WM8804_PLL5, 0x3 | 0x8,
435 pll_div.freqmode | (pll_div.mclkdiv << 3));
436 /* set PLLK */
437 snd_soc_component_write(component, WM8804_PLL1, pll_div.k & 0xff);
438 snd_soc_component_write(component, WM8804_PLL2, (pll_div.k >> 8) & 0xff);
439 snd_soc_component_write(component, WM8804_PLL3, pll_div.k >> 16);
440
441 /* power up the PLL */
442 snd_soc_component_update_bits(component, WM8804_PWRDN, 0x1, 0);
443 }
444
445 return 0;
446 }
447
wm8804_set_sysclk(struct snd_soc_dai * dai,int clk_id,unsigned int freq,int dir)448 static int wm8804_set_sysclk(struct snd_soc_dai *dai,
449 int clk_id, unsigned int freq, int dir)
450 {
451 struct snd_soc_component *component;
452
453 component = dai->component;
454
455 switch (clk_id) {
456 case WM8804_TX_CLKSRC_MCLK:
457 if ((freq >= 10000000 && freq <= 14400000)
458 || (freq >= 16280000 && freq <= 27000000))
459 snd_soc_component_update_bits(component, WM8804_PLL6, 0x80, 0x80);
460 else {
461 dev_err(dai->dev, "OSCCLOCK is not within the "
462 "recommended range: %uHz\n", freq);
463 return -EINVAL;
464 }
465 break;
466 case WM8804_TX_CLKSRC_PLL:
467 snd_soc_component_update_bits(component, WM8804_PLL6, 0x80, 0);
468 break;
469 case WM8804_CLKOUT_SRC_CLK1:
470 snd_soc_component_update_bits(component, WM8804_PLL6, 0x8, 0);
471 break;
472 case WM8804_CLKOUT_SRC_OSCCLK:
473 snd_soc_component_update_bits(component, WM8804_PLL6, 0x8, 0x8);
474 break;
475 default:
476 dev_err(dai->dev, "Unknown clock source: %d\n", clk_id);
477 return -EINVAL;
478 }
479
480 return 0;
481 }
482
wm8804_set_clkdiv(struct snd_soc_dai * dai,int div_id,int div)483 static int wm8804_set_clkdiv(struct snd_soc_dai *dai,
484 int div_id, int div)
485 {
486 struct snd_soc_component *component;
487 struct wm8804_priv *wm8804;
488
489 component = dai->component;
490 switch (div_id) {
491 case WM8804_CLKOUT_DIV:
492 snd_soc_component_update_bits(component, WM8804_PLL5, 0x30,
493 (div & 0x3) << 4);
494 break;
495 case WM8804_MCLK_DIV:
496 wm8804 = snd_soc_component_get_drvdata(component);
497 wm8804->mclk_div = div;
498 break;
499 default:
500 dev_err(dai->dev, "Unknown clock divider: %d\n", div_id);
501 return -EINVAL;
502 }
503 return 0;
504 }
505
506 static const struct snd_soc_dai_ops wm8804_dai_ops = {
507 .hw_params = wm8804_hw_params,
508 .set_fmt = wm8804_set_fmt,
509 .set_sysclk = wm8804_set_sysclk,
510 .set_clkdiv = wm8804_set_clkdiv,
511 .set_pll = wm8804_set_pll
512 };
513
514 #define WM8804_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
515 SNDRV_PCM_FMTBIT_S24_LE)
516
517 #define WM8804_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
518 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \
519 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | \
520 SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000)
521
522 static struct snd_soc_dai_driver wm8804_dai = {
523 .name = "wm8804-spdif",
524 .playback = {
525 .stream_name = "Playback",
526 .channels_min = 2,
527 .channels_max = 2,
528 .rates = WM8804_RATES,
529 .formats = WM8804_FORMATS,
530 },
531 .capture = {
532 .stream_name = "Capture",
533 .channels_min = 2,
534 .channels_max = 2,
535 .rates = WM8804_RATES,
536 .formats = WM8804_FORMATS,
537 },
538 .ops = &wm8804_dai_ops,
539 .symmetric_rate = 1
540 };
541
542 static const struct snd_soc_component_driver soc_component_dev_wm8804 = {
543 .dapm_widgets = wm8804_dapm_widgets,
544 .num_dapm_widgets = ARRAY_SIZE(wm8804_dapm_widgets),
545 .dapm_routes = wm8804_dapm_routes,
546 .num_dapm_routes = ARRAY_SIZE(wm8804_dapm_routes),
547 .use_pmdown_time = 1,
548 .endianness = 1,
549 };
550
551 const struct regmap_config wm8804_regmap_config = {
552 .reg_bits = 8,
553 .val_bits = 8,
554
555 .max_register = WM8804_MAX_REGISTER,
556 .volatile_reg = wm8804_volatile,
557
558 .cache_type = REGCACHE_MAPLE,
559 .reg_defaults = wm8804_reg_defaults,
560 .num_reg_defaults = ARRAY_SIZE(wm8804_reg_defaults),
561 };
562 EXPORT_SYMBOL_GPL(wm8804_regmap_config);
563
wm8804_probe(struct device * dev,struct regmap * regmap)564 int wm8804_probe(struct device *dev, struct regmap *regmap)
565 {
566 struct wm8804_priv *wm8804;
567 unsigned int id1, id2;
568 int i, ret;
569
570 wm8804 = devm_kzalloc(dev, sizeof(*wm8804), GFP_KERNEL);
571 if (!wm8804)
572 return -ENOMEM;
573
574 dev_set_drvdata(dev, wm8804);
575
576 wm8804->dev = dev;
577 wm8804->regmap = regmap;
578
579 wm8804->reset = devm_gpiod_get_optional(dev, "wlf,reset",
580 GPIOD_OUT_LOW);
581 if (IS_ERR(wm8804->reset)) {
582 ret = PTR_ERR(wm8804->reset);
583 dev_err(dev, "Failed to get reset line: %d\n", ret);
584 return ret;
585 }
586
587 for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++)
588 wm8804->supplies[i].supply = wm8804_supply_names[i];
589
590 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(wm8804->supplies),
591 wm8804->supplies);
592 if (ret) {
593 dev_err(dev, "Failed to request supplies: %d\n", ret);
594 return ret;
595 }
596
597 wm8804->disable_nb[0].notifier_call = wm8804_regulator_event_0;
598 wm8804->disable_nb[1].notifier_call = wm8804_regulator_event_1;
599
600 /* This should really be moved into the regulator core */
601 for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++) {
602 struct regulator *regulator = wm8804->supplies[i].consumer;
603
604 ret = devm_regulator_register_notifier(regulator,
605 &wm8804->disable_nb[i]);
606 if (ret != 0) {
607 dev_err(dev,
608 "Failed to register regulator notifier: %d\n",
609 ret);
610 return ret;
611 }
612 }
613
614 ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
615 wm8804->supplies);
616 if (ret) {
617 dev_err(dev, "Failed to enable supplies: %d\n", ret);
618 return ret;
619 }
620
621 gpiod_set_value_cansleep(wm8804->reset, 1);
622
623 ret = regmap_read(regmap, WM8804_RST_DEVID1, &id1);
624 if (ret < 0) {
625 dev_err(dev, "Failed to read device ID: %d\n", ret);
626 goto err_reg_enable;
627 }
628
629 ret = regmap_read(regmap, WM8804_DEVID2, &id2);
630 if (ret < 0) {
631 dev_err(dev, "Failed to read device ID: %d\n", ret);
632 goto err_reg_enable;
633 }
634
635 id2 = (id2 << 8) | id1;
636
637 if (id2 != 0x8805) {
638 dev_err(dev, "Invalid device ID: %#x\n", id2);
639 ret = -EINVAL;
640 goto err_reg_enable;
641 }
642
643 ret = regmap_read(regmap, WM8804_DEVREV, &id1);
644 if (ret < 0) {
645 dev_err(dev, "Failed to read device revision: %d\n",
646 ret);
647 goto err_reg_enable;
648 }
649 dev_info(dev, "revision %c\n", id1 + 'A');
650
651 if (!wm8804->reset) {
652 ret = wm8804_soft_reset(wm8804);
653 if (ret < 0) {
654 dev_err(dev, "Failed to issue reset: %d\n", ret);
655 goto err_reg_enable;
656 }
657 }
658
659 ret = devm_snd_soc_register_component(dev, &soc_component_dev_wm8804,
660 &wm8804_dai, 1);
661 if (ret < 0) {
662 dev_err(dev, "Failed to register CODEC: %d\n", ret);
663 goto err_reg_enable;
664 }
665
666 pm_runtime_set_active(dev);
667 pm_runtime_enable(dev);
668 pm_runtime_idle(dev);
669
670 return 0;
671
672 err_reg_enable:
673 regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
674 return ret;
675 }
676 EXPORT_SYMBOL_GPL(wm8804_probe);
677
wm8804_remove(struct device * dev)678 void wm8804_remove(struct device *dev)
679 {
680 pm_runtime_disable(dev);
681 }
682 EXPORT_SYMBOL_GPL(wm8804_remove);
683
684 #if IS_ENABLED(CONFIG_PM)
wm8804_runtime_resume(struct device * dev)685 static int wm8804_runtime_resume(struct device *dev)
686 {
687 struct wm8804_priv *wm8804 = dev_get_drvdata(dev);
688 int ret;
689
690 ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
691 wm8804->supplies);
692 if (ret) {
693 dev_err(wm8804->dev, "Failed to enable supplies: %d\n", ret);
694 return ret;
695 }
696
697 regcache_sync(wm8804->regmap);
698
699 /* Power up OSCCLK */
700 regmap_update_bits(wm8804->regmap, WM8804_PWRDN, 0x8, 0x0);
701
702 return 0;
703 }
704
wm8804_runtime_suspend(struct device * dev)705 static int wm8804_runtime_suspend(struct device *dev)
706 {
707 struct wm8804_priv *wm8804 = dev_get_drvdata(dev);
708
709 /* Power down OSCCLK */
710 regmap_update_bits(wm8804->regmap, WM8804_PWRDN, 0x8, 0x8);
711
712 regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies),
713 wm8804->supplies);
714
715 return 0;
716 }
717 #endif
718
719 const struct dev_pm_ops wm8804_pm = {
720 SET_RUNTIME_PM_OPS(wm8804_runtime_suspend, wm8804_runtime_resume, NULL)
721 };
722 EXPORT_SYMBOL_GPL(wm8804_pm);
723
724 MODULE_DESCRIPTION("ASoC WM8804 driver");
725 MODULE_AUTHOR("Dimitris Papastamos <dp@opensource.wolfsonmicro.com>");
726 MODULE_LICENSE("GPL");
727