ASoC: atmel-classd: add the Audio Class D Amplifier
[sfrench/cifs-2.6.git] / sound / soc / atmel / atmel-classd.c
1 /* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
2  *
3  * Copyright (C) 2015 Atmel
4  *
5  * Author: Songjun Wu <songjun.wu@atmel.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 or later
9  * as published by the Free Software Foundation.
10  */
11
12 #include <linux/of.h>
13 #include <linux/clk.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <sound/core.h>
18 #include <sound/dmaengine_pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/tlv.h>
21 #include "atmel-classd.h"
22
23 struct atmel_classd_pdata {
24         bool non_overlap_enable;
25         int non_overlap_time;
26         int pwm_type;
27         const char *card_name;
28 };
29
30 struct atmel_classd {
31         dma_addr_t phy_base;
32         struct regmap *regmap;
33         struct clk *pclk;
34         struct clk *gclk;
35         struct clk *aclk;
36         int irq;
37         const struct atmel_classd_pdata *pdata;
38 };
39
40 #ifdef CONFIG_OF
41 static const struct of_device_id atmel_classd_of_match[] = {
42         {
43                 .compatible = "atmel,sama5d2-classd",
44         }, {
45                 /* sentinel */
46         }
47 };
48 MODULE_DEVICE_TABLE(of, atmel_classd_of_match);
49
50 static struct atmel_classd_pdata *atmel_classd_dt_init(struct device *dev)
51 {
52         struct device_node *np = dev->of_node;
53         struct atmel_classd_pdata *pdata;
54         const char *pwm_type;
55         int ret;
56
57         if (!np) {
58                 dev_err(dev, "device node not found\n");
59                 return ERR_PTR(-EINVAL);
60         }
61
62         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
63         if (!pdata)
64                 return ERR_PTR(-ENOMEM);
65
66         ret = of_property_read_string(np, "atmel,pwm-type", &pwm_type);
67         if ((ret == 0) && (strcmp(pwm_type, "diff") == 0))
68                 pdata->pwm_type = CLASSD_MR_PWMTYP_DIFF;
69         else
70                 pdata->pwm_type = CLASSD_MR_PWMTYP_SINGLE;
71
72         ret = of_property_read_u32(np,
73                         "atmel,non-overlap-time", &pdata->non_overlap_time);
74         if (ret)
75                 pdata->non_overlap_enable = false;
76         else
77                 pdata->non_overlap_enable = true;
78
79         ret = of_property_read_string(np, "atmel,model", &pdata->card_name);
80         if (ret)
81                 pdata->card_name = "CLASSD";
82
83         return pdata;
84 }
85 #else
86 static inline struct atmel_classd_pdata *
87 atmel_classd_dt_init(struct device *dev)
88 {
89         return ERR_PTR(-EINVAL);
90 }
91 #endif
92
93 #define ATMEL_CLASSD_RATES (SNDRV_PCM_RATE_8000 \
94                         | SNDRV_PCM_RATE_16000  | SNDRV_PCM_RATE_22050 \
95                         | SNDRV_PCM_RATE_32000  | SNDRV_PCM_RATE_44100 \
96                         | SNDRV_PCM_RATE_48000  | SNDRV_PCM_RATE_88200 \
97                         | SNDRV_PCM_RATE_96000)
98
99 static const struct snd_pcm_hardware atmel_classd_hw = {
100         .info                   = SNDRV_PCM_INFO_MMAP
101                                 | SNDRV_PCM_INFO_MMAP_VALID
102                                 | SNDRV_PCM_INFO_INTERLEAVED
103                                 | SNDRV_PCM_INFO_RESUME
104                                 | SNDRV_PCM_INFO_PAUSE,
105         .formats                = (SNDRV_PCM_FMTBIT_S16_LE),
106         .rates                  = ATMEL_CLASSD_RATES,
107         .rate_min               = 8000,
108         .rate_max               = 96000,
109         .channels_min           = 2,
110         .channels_max           = 2,
111         .buffer_bytes_max       = 64 * 1024,
112         .period_bytes_min       = 256,
113         .period_bytes_max       = 32 * 1024,
114         .periods_min            = 2,
115         .periods_max            = 256,
116 };
117
118 #define ATMEL_CLASSD_PREALLOC_BUF_SIZE  (64 * 1024)
119
120 /* cpu dai component */
121 static int atmel_classd_cpu_dai_startup(struct snd_pcm_substream *substream,
122                                         struct snd_soc_dai *cpu_dai)
123 {
124         struct snd_soc_pcm_runtime *rtd = substream->private_data;
125         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
126
127         regmap_write(dd->regmap, CLASSD_THR, 0x0);
128
129         return clk_prepare_enable(dd->pclk);
130 }
131
132 static void atmel_classd_cpu_dai_shutdown(struct snd_pcm_substream *substream,
133                                         struct snd_soc_dai *cpu_dai)
134 {
135         struct snd_soc_pcm_runtime *rtd = substream->private_data;
136         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
137
138         clk_disable_unprepare(dd->pclk);
139 }
140
141 static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
142         .startup        = atmel_classd_cpu_dai_startup,
143         .shutdown       = atmel_classd_cpu_dai_shutdown,
144 };
145
146 static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
147         .playback = {
148                 .channels_min   = 2,
149                 .channels_max   = 2,
150                 .rates          = ATMEL_CLASSD_RATES,
151                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,},
152         .ops = &atmel_classd_cpu_dai_ops,
153 };
154
155 static const struct snd_soc_component_driver atmel_classd_cpu_dai_component = {
156         .name = "atmel-classd",
157 };
158
159 /* platform */
160 static int
161 atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
162         struct snd_pcm_hw_params *params,
163         struct dma_slave_config *slave_config)
164 {
165         struct snd_soc_pcm_runtime *rtd = substream->private_data;
166         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
167
168         if (params_physical_width(params) != 16) {
169                 dev_err(rtd->platform->dev,
170                         "only supports 16-bit audio data\n");
171                 return -EINVAL;
172         }
173
174         slave_config->direction         = DMA_MEM_TO_DEV;
175         slave_config->dst_addr          = dd->phy_base + CLASSD_THR;
176         slave_config->dst_addr_width    = DMA_SLAVE_BUSWIDTH_4_BYTES;
177         slave_config->dst_maxburst      = 1;
178         slave_config->src_maxburst      = 1;
179         slave_config->device_fc         = false;
180
181         return 0;
182 }
183
184 static const struct snd_dmaengine_pcm_config
185 atmel_classd_dmaengine_pcm_config = {
186         .prepare_slave_config   = atmel_classd_platform_configure_dma,
187         .pcm_hardware           = &atmel_classd_hw,
188         .prealloc_buffer_size   = ATMEL_CLASSD_PREALLOC_BUF_SIZE,
189 };
190
191 /* codec */
192 static const char * const mono_mode_text[] = {
193         "mix", "sat", "left", "right"
194 };
195
196 static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
197                         CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
198                         mono_mode_text);
199
200 static const char * const eqcfg_text[] = {
201         "Treble-12dB", "Treble-6dB",
202         "Medium-8dB", "Medium-3dB",
203         "Bass-12dB", "Bass-6dB",
204         "0 dB",
205         "Bass+6dB", "Bass+12dB",
206         "Medium+3dB", "Medium+8dB",
207         "Treble+6dB", "Treble+12dB",
208 };
209
210 static const unsigned int eqcfg_value[] = {
211         CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
212         CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
213         CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
214         CLASSD_INTPMR_EQCFG_FLAT,
215         CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
216         CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
217         CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
218 };
219
220 static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
221                 CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
222                 eqcfg_text, eqcfg_value);
223
224 static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);
225
226 static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
227 SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
228                 CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
229                 78, 1, classd_digital_tlv),
230
231 SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
232                 CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),
233
234 SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),
235
236 SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),
237
238 SOC_ENUM("Mono Mode", classd_mono_mode_enum),
239
240 SOC_ENUM("EQ", classd_eqcfg_enum),
241 };
242
243 static const char * const pwm_type[] = {
244         "Single ended", "Differential"
245 };
246
247 static int atmel_classd_codec_probe(struct snd_soc_codec *codec)
248 {
249         struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
250         struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
251         const struct atmel_classd_pdata *pdata = dd->pdata;
252         u32 mask, val;
253
254         mask = CLASSD_MR_PWMTYP_MASK;
255         val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;
256
257         mask |= CLASSD_MR_NON_OVERLAP_MASK;
258         if (pdata->non_overlap_enable) {
259                 val |= (CLASSD_MR_NON_OVERLAP_EN
260                         << CLASSD_MR_NON_OVERLAP_SHIFT);
261
262                 mask |= CLASSD_MR_NOVR_VAL_MASK;
263                 switch (pdata->non_overlap_time) {
264                 case 5:
265                         val |= (CLASSD_MR_NOVR_VAL_5NS
266                                 << CLASSD_MR_NOVR_VAL_SHIFT);
267                         break;
268                 case 10:
269                         val |= (CLASSD_MR_NOVR_VAL_10NS
270                                 << CLASSD_MR_NOVR_VAL_SHIFT);
271                         break;
272                 case 15:
273                         val |= (CLASSD_MR_NOVR_VAL_15NS
274                                 << CLASSD_MR_NOVR_VAL_SHIFT);
275                         break;
276                 case 20:
277                         val |= (CLASSD_MR_NOVR_VAL_20NS
278                                 << CLASSD_MR_NOVR_VAL_SHIFT);
279                         break;
280                 default:
281                         val |= (CLASSD_MR_NOVR_VAL_10NS
282                                 << CLASSD_MR_NOVR_VAL_SHIFT);
283                         dev_warn(codec->dev,
284                                 "non-overlapping value %d is invalid, the default value 10 is specified\n",
285                                 pdata->non_overlap_time);
286                         break;
287                 }
288         }
289
290         snd_soc_update_bits(codec, CLASSD_MR, mask, val);
291
292         dev_info(codec->dev,
293                 "PWM modulation type is %s, non-overlapping is %s\n",
294                 pwm_type[pdata->pwm_type],
295                 pdata->non_overlap_enable?"enabled":"disabled");
296
297         return 0;
298 }
299
300 static struct regmap *atmel_classd_codec_get_remap(struct device *dev)
301 {
302         return dev_get_regmap(dev, NULL);
303 }
304
305 static struct snd_soc_codec_driver soc_codec_dev_classd = {
306         .probe          = atmel_classd_codec_probe,
307         .controls       = atmel_classd_snd_controls,
308         .num_controls   = ARRAY_SIZE(atmel_classd_snd_controls),
309         .get_regmap     = atmel_classd_codec_get_remap,
310 };
311
312 /* codec dai component */
313 static int atmel_classd_codec_dai_startup(struct snd_pcm_substream *substream,
314                                 struct snd_soc_dai *codec_dai)
315 {
316         struct snd_soc_pcm_runtime *rtd = substream->private_data;
317         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
318         int ret;
319
320         ret = clk_prepare_enable(dd->aclk);
321         if (ret)
322                 return ret;
323
324         return clk_prepare_enable(dd->gclk);
325 }
326
327 static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
328         int mute)
329 {
330         struct snd_soc_codec *codec = codec_dai->codec;
331         u32 mask, val;
332
333         mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;
334
335         if (mute)
336                 val = mask;
337         else
338                 val = 0;
339
340         snd_soc_update_bits(codec, CLASSD_MR, mask, val);
341
342         return 0;
343 }
344
345 #define CLASSD_ACLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
346 #define CLASSD_ACLK_RATE_12M288_MPY_8  (12228 * 1000 * 8)
347
348 static struct {
349         int rate;
350         int sample_rate;
351         int dsp_clk;
352         unsigned long aclk_rate;
353 } const sample_rates[] = {
354         { 8000,  CLASSD_INTPMR_FRAME_8K,
355         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
356         { 16000, CLASSD_INTPMR_FRAME_16K,
357         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
358         { 32000, CLASSD_INTPMR_FRAME_32K,
359         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
360         { 48000, CLASSD_INTPMR_FRAME_48K,
361         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
362         { 96000, CLASSD_INTPMR_FRAME_96K,
363         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
364         { 22050, CLASSD_INTPMR_FRAME_22K,
365         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
366         { 44100, CLASSD_INTPMR_FRAME_44K,
367         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
368         { 88200, CLASSD_INTPMR_FRAME_88K,
369         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
370 };
371
372 static int
373 atmel_classd_codec_dai_hw_params(struct snd_pcm_substream *substream,
374                             struct snd_pcm_hw_params *params,
375                             struct snd_soc_dai *codec_dai)
376 {
377         struct snd_soc_pcm_runtime *rtd = substream->private_data;
378         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
379         struct snd_soc_codec *codec = codec_dai->codec;
380         int fs;
381         int i, best, best_val, cur_val, ret;
382         u32 mask, val;
383
384         fs = params_rate(params);
385
386         best = 0;
387         best_val = abs(fs - sample_rates[0].rate);
388         for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
389                 /* Closest match */
390                 cur_val = abs(fs - sample_rates[i].rate);
391                 if (cur_val < best_val) {
392                         best = i;
393                         best_val = cur_val;
394                 }
395         }
396
397         dev_dbg(codec->dev,
398                 "Selected SAMPLE_RATE of %dHz, ACLK_RATE of %ldHz\n",
399                 sample_rates[best].rate, sample_rates[best].aclk_rate);
400
401         clk_disable_unprepare(dd->gclk);
402         clk_disable_unprepare(dd->aclk);
403
404         ret = clk_set_rate(dd->aclk, sample_rates[best].aclk_rate);
405         if (ret)
406                 return ret;
407
408         mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK | CLASSD_INTPMR_FRAME_MASK;
409         val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
410         | (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);
411
412         snd_soc_update_bits(codec, CLASSD_INTPMR, mask, val);
413
414         ret = clk_prepare_enable(dd->aclk);
415         if (ret)
416                 return ret;
417
418         return clk_prepare_enable(dd->gclk);
419 }
420
421 static void
422 atmel_classd_codec_dai_shutdown(struct snd_pcm_substream *substream,
423                             struct snd_soc_dai *codec_dai)
424 {
425         struct snd_soc_pcm_runtime *rtd = substream->private_data;
426         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
427
428         clk_disable_unprepare(dd->gclk);
429         clk_disable_unprepare(dd->aclk);
430 }
431
432 static int atmel_classd_codec_dai_prepare(struct snd_pcm_substream *substream,
433                                         struct snd_soc_dai *codec_dai)
434 {
435         struct snd_soc_codec *codec = codec_dai->codec;
436
437         snd_soc_update_bits(codec, CLASSD_MR,
438                                 CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK,
439                                 (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
440                                 |(CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT));
441
442         return 0;
443 }
444
445 static int atmel_classd_codec_dai_trigger(struct snd_pcm_substream *substream,
446                                         int cmd, struct snd_soc_dai *codec_dai)
447 {
448         struct snd_soc_codec *codec = codec_dai->codec;
449         u32 mask, val;
450
451         mask = CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK;
452
453         switch (cmd) {
454         case SNDRV_PCM_TRIGGER_START:
455         case SNDRV_PCM_TRIGGER_RESUME:
456         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
457                 val = mask;
458                 break;
459         case SNDRV_PCM_TRIGGER_STOP:
460         case SNDRV_PCM_TRIGGER_SUSPEND:
461         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
462                 val = (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
463                         | (CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT);
464                 break;
465         default:
466                 return -EINVAL;
467         }
468
469         snd_soc_update_bits(codec, CLASSD_MR, mask, val);
470
471         return 0;
472 }
473
474 static const struct snd_soc_dai_ops atmel_classd_codec_dai_ops = {
475         .digital_mute   = atmel_classd_codec_dai_digital_mute,
476         .startup        = atmel_classd_codec_dai_startup,
477         .shutdown       = atmel_classd_codec_dai_shutdown,
478         .hw_params      = atmel_classd_codec_dai_hw_params,
479         .prepare        = atmel_classd_codec_dai_prepare,
480         .trigger        = atmel_classd_codec_dai_trigger,
481 };
482
483 #define ATMEL_CLASSD_CODEC_DAI_NAME  "atmel-classd-hifi"
484
485 static struct snd_soc_dai_driver atmel_classd_codec_dai = {
486         .name = ATMEL_CLASSD_CODEC_DAI_NAME,
487         .playback = {
488                 .stream_name    = "Playback",
489                 .channels_min   = 2,
490                 .channels_max   = 2,
491                 .rates          = ATMEL_CLASSD_RATES,
492                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,
493         },
494         .ops = &atmel_classd_codec_dai_ops,
495 };
496
497 /* ASoC sound card */
498 static int atmel_classd_asoc_card_init(struct device *dev,
499                                         struct snd_soc_card *card)
500 {
501         struct snd_soc_dai_link *dai_link;
502         struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
503
504         dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
505         if (!dai_link)
506                 return -ENOMEM;
507
508         dai_link->name                  = "CLASSD";
509         dai_link->stream_name           = "CLASSD PCM";
510         dai_link->codec_dai_name        = ATMEL_CLASSD_CODEC_DAI_NAME;
511         dai_link->cpu_dai_name          = dev_name(dev);
512         dai_link->codec_name            = dev_name(dev);
513         dai_link->platform_name         = dev_name(dev);
514
515         card->dai_link  = dai_link;
516         card->num_links = 1;
517         card->name      = dd->pdata->card_name;
518         card->dev       = dev;
519
520         return 0;
521 };
522
523 /* regmap configuration */
524 static const struct reg_default atmel_classd_reg_defaults[] = {
525         { CLASSD_INTPMR,   0x00301212 },
526 };
527
528 #define ATMEL_CLASSD_REG_MAX    0xE4
529 static const struct regmap_config atmel_classd_regmap_config = {
530         .reg_bits       = 32,
531         .reg_stride     = 4,
532         .val_bits       = 32,
533         .max_register   = ATMEL_CLASSD_REG_MAX,
534
535         .cache_type             = REGCACHE_FLAT,
536         .reg_defaults           = atmel_classd_reg_defaults,
537         .num_reg_defaults       = ARRAY_SIZE(atmel_classd_reg_defaults),
538 };
539
540 static int atmel_classd_probe(struct platform_device *pdev)
541 {
542         struct device *dev = &pdev->dev;
543         struct atmel_classd *dd;
544         struct resource *res;
545         void __iomem *io_base;
546         const struct atmel_classd_pdata *pdata;
547         struct snd_soc_card *card;
548         int ret;
549
550         pdata = dev_get_platdata(dev);
551         if (!pdata) {
552                 pdata = atmel_classd_dt_init(dev);
553                 if (IS_ERR(pdata))
554                         return PTR_ERR(pdata);
555         }
556
557         dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
558         if (!dd)
559                 return -ENOMEM;
560
561         dd->pdata = pdata;
562
563         dd->irq = platform_get_irq(pdev, 0);
564         if (dd->irq < 0) {
565                 ret = dd->irq;
566                 dev_err(dev, "failed to could not get irq: %d\n", ret);
567                 return ret;
568         }
569
570         dd->pclk = devm_clk_get(dev, "pclk");
571         if (IS_ERR(dd->pclk)) {
572                 ret = PTR_ERR(dd->pclk);
573                 dev_err(dev, "failed to get peripheral clock: %d\n", ret);
574                 return ret;
575         }
576
577         dd->gclk = devm_clk_get(dev, "gclk");
578         if (IS_ERR(dd->gclk)) {
579                 ret = PTR_ERR(dd->gclk);
580                 dev_err(dev, "failed to get GCK clock: %d\n", ret);
581                 return ret;
582         }
583
584         dd->aclk = devm_clk_get(dev, "aclk");
585         if (IS_ERR(dd->aclk)) {
586                 ret = PTR_ERR(dd->aclk);
587                 dev_err(dev, "failed to get audio clock: %d\n", ret);
588                 return ret;
589         }
590
591         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
592         if (!res) {
593                 dev_err(dev, "no memory resource\n");
594                 return -ENXIO;
595         }
596
597         io_base = devm_ioremap_resource(dev, res);
598         if (IS_ERR(io_base)) {
599                 ret =  PTR_ERR(io_base);
600                 dev_err(dev, "failed to remap register memory: %d\n", ret);
601                 return ret;
602         }
603
604         dd->phy_base = res->start;
605
606         dd->regmap = devm_regmap_init_mmio(dev, io_base,
607                                         &atmel_classd_regmap_config);
608         if (IS_ERR(dd->regmap)) {
609                 ret = PTR_ERR(dd->regmap);
610                 dev_err(dev, "failed to init register map: %d\n", ret);
611                 return ret;
612         }
613
614         ret = devm_snd_soc_register_component(dev,
615                                         &atmel_classd_cpu_dai_component,
616                                         &atmel_classd_cpu_dai, 1);
617         if (ret) {
618                 dev_err(dev, "could not register CPU DAI: %d\n", ret);
619                 return ret;
620         }
621
622         ret = devm_snd_dmaengine_pcm_register(dev,
623                                         &atmel_classd_dmaengine_pcm_config,
624                                         0);
625         if (ret) {
626                 dev_err(dev, "could not register platform: %d\n", ret);
627                 return ret;
628         }
629
630         ret = snd_soc_register_codec(dev, &soc_codec_dev_classd,
631                                         &atmel_classd_codec_dai, 1);
632         if (ret) {
633                 dev_err(dev, "could not register codec: %d\n", ret);
634                 return ret;
635         }
636
637         /* register sound card */
638         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
639         if (!card)
640                 return -ENOMEM;
641
642         snd_soc_card_set_drvdata(card, dd);
643         platform_set_drvdata(pdev, card);
644
645         ret = atmel_classd_asoc_card_init(dev, card);
646         if (ret) {
647                 dev_err(dev, "failed to init sound card\n");
648                 return ret;
649         }
650
651         ret = devm_snd_soc_register_card(dev, card);
652         if (ret) {
653                 dev_err(dev, "failed to register sound card: %d\n", ret);
654                 return ret;
655         }
656
657         return 0;
658 }
659
660 static int atmel_classd_remove(struct platform_device *pdev)
661 {
662         snd_soc_unregister_codec(&pdev->dev);
663         return 0;
664 }
665
666 static struct platform_driver atmel_classd_driver = {
667         .driver = {
668                 .name           = "atmel-classd",
669                 .of_match_table = of_match_ptr(atmel_classd_of_match),
670                 .pm             = &snd_soc_pm_ops,
671         },
672         .probe  = atmel_classd_probe,
673         .remove = atmel_classd_remove,
674 };
675 module_platform_driver(atmel_classd_driver);
676
677 MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
678 MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
679 MODULE_LICENSE("GPL");