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