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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
3 *
4 * Copyright (C) 2015 Atmel
5 *
6 * Author: Songjun Wu <songjun.wu@atmel.com>
7 */
8
9#include <linux/of.h>
10#include <linux/clk.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14#include <sound/core.h>
15#include <sound/dmaengine_pcm.h>
16#include <sound/pcm_params.h>
17#include <sound/tlv.h>
18#include "atmel-classd.h"
19
20struct atmel_classd_pdata {
21 bool non_overlap_enable;
22 int non_overlap_time;
23 int pwm_type;
24 const char *card_name;
25};
26
27struct atmel_classd {
28 dma_addr_t phy_base;
29 struct regmap *regmap;
30 struct clk *pclk;
31 struct clk *gclk;
32 struct device *dev;
33 int irq;
34 const struct atmel_classd_pdata *pdata;
35};
36
37#ifdef CONFIG_OF
38static const struct of_device_id atmel_classd_of_match[] = {
39 {
40 .compatible = "atmel,sama5d2-classd",
41 }, {
42 /* sentinel */
43 }
44};
45MODULE_DEVICE_TABLE(of, atmel_classd_of_match);
46
47static struct atmel_classd_pdata *atmel_classd_dt_init(struct device *dev)
48{
49 struct device_node *np = dev->of_node;
50 struct atmel_classd_pdata *pdata;
51 const char *pwm_type_s;
52 int ret;
53
54 if (!np) {
55 dev_err(dev, "device node not found\n");
56 return ERR_PTR(-EINVAL);
57 }
58
59 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
60 if (!pdata)
61 return ERR_PTR(-ENOMEM);
62
63 ret = of_property_read_string(np, "atmel,pwm-type", &pwm_type_s);
64 if ((ret == 0) && (strcmp(pwm_type_s, "diff") == 0))
65 pdata->pwm_type = CLASSD_MR_PWMTYP_DIFF;
66 else
67 pdata->pwm_type = CLASSD_MR_PWMTYP_SINGLE;
68
69 ret = of_property_read_u32(np,
70 "atmel,non-overlap-time", &pdata->non_overlap_time);
71 if (ret)
72 pdata->non_overlap_enable = false;
73 else
74 pdata->non_overlap_enable = true;
75
76 ret = of_property_read_string(np, "atmel,model", &pdata->card_name);
77 if (ret)
78 pdata->card_name = "CLASSD";
79
80 return pdata;
81}
82#else
83static inline struct atmel_classd_pdata *
84atmel_classd_dt_init(struct device *dev)
85{
86 return ERR_PTR(-EINVAL);
87}
88#endif
89
90#define ATMEL_CLASSD_RATES (SNDRV_PCM_RATE_8000 \
91 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 \
92 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 \
93 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 \
94 | SNDRV_PCM_RATE_96000)
95
96static const struct snd_pcm_hardware atmel_classd_hw = {
97 .info = SNDRV_PCM_INFO_MMAP
98 | SNDRV_PCM_INFO_MMAP_VALID
99 | SNDRV_PCM_INFO_INTERLEAVED
100 | SNDRV_PCM_INFO_RESUME
101 | SNDRV_PCM_INFO_PAUSE,
102 .formats = (SNDRV_PCM_FMTBIT_S16_LE),
103 .rates = ATMEL_CLASSD_RATES,
104 .rate_min = 8000,
105 .rate_max = 96000,
106 .channels_min = 1,
107 .channels_max = 2,
108 .buffer_bytes_max = 64 * 1024,
109 .period_bytes_min = 256,
110 .period_bytes_max = 32 * 1024,
111 .periods_min = 2,
112 .periods_max = 256,
113};
114
115#define ATMEL_CLASSD_PREALLOC_BUF_SIZE (64 * 1024)
116
117/* cpu dai component */
118static int atmel_classd_cpu_dai_startup(struct snd_pcm_substream *substream,
119 struct snd_soc_dai *cpu_dai)
120{
121 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
122 struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
123 int err;
124
125 regmap_write(dd->regmap, CLASSD_THR, 0x0);
126
127 err = clk_prepare_enable(dd->pclk);
128 if (err)
129 return err;
130 err = clk_prepare_enable(dd->gclk);
131 if (err) {
132 clk_disable_unprepare(dd->pclk);
133 return err;
134 }
135 return 0;
136}
137
138/* platform */
139static int
140atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
141 struct snd_pcm_hw_params *params,
142 struct dma_slave_config *slave_config)
143{
144 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
145 struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
146
147 if (params_physical_width(params) != 16) {
148 dev_err(dd->dev,
149 "only supports 16-bit audio data\n");
150 return -EINVAL;
151 }
152
153 if (params_channels(params) == 1)
154 slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
155 else
156 slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
157
158 slave_config->direction = DMA_MEM_TO_DEV;
159 slave_config->dst_addr = dd->phy_base + CLASSD_THR;
160 slave_config->dst_maxburst = 1;
161 slave_config->src_maxburst = 1;
162 slave_config->device_fc = false;
163
164 return 0;
165}
166
167static const struct snd_dmaengine_pcm_config
168atmel_classd_dmaengine_pcm_config = {
169 .prepare_slave_config = atmel_classd_platform_configure_dma,
170 .pcm_hardware = &atmel_classd_hw,
171 .prealloc_buffer_size = ATMEL_CLASSD_PREALLOC_BUF_SIZE,
172};
173
174/* codec */
175static const char * const mono_mode_text[] = {
176 "mix", "sat", "left", "right"
177};
178
179static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
180 CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
181 mono_mode_text);
182
183static const char * const eqcfg_text[] = {
184 "Treble-12dB", "Treble-6dB",
185 "Medium-8dB", "Medium-3dB",
186 "Bass-12dB", "Bass-6dB",
187 "0 dB",
188 "Bass+6dB", "Bass+12dB",
189 "Medium+3dB", "Medium+8dB",
190 "Treble+6dB", "Treble+12dB",
191};
192
193static const unsigned int eqcfg_value[] = {
194 CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
195 CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
196 CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
197 CLASSD_INTPMR_EQCFG_FLAT,
198 CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
199 CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
200 CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
201};
202
203static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
204 CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
205 eqcfg_text, eqcfg_value);
206
207static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);
208
209static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
210SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
211 CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
212 78, 1, classd_digital_tlv),
213
214SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
215 CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),
216
217SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),
218
219SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),
220
221SOC_ENUM("Mono Mode", classd_mono_mode_enum),
222
223SOC_ENUM("EQ", classd_eqcfg_enum),
224};
225
226static const char * const pwm_type[] = {
227 "Single ended", "Differential"
228};
229
230static int atmel_classd_component_probe(struct snd_soc_component *component)
231{
232 struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
233 struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
234 const struct atmel_classd_pdata *pdata = dd->pdata;
235 u32 mask, val;
236
237 mask = CLASSD_MR_PWMTYP_MASK;
238 val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;
239
240 mask |= CLASSD_MR_NON_OVERLAP_MASK;
241 if (pdata->non_overlap_enable) {
242 val |= (CLASSD_MR_NON_OVERLAP_EN
243 << CLASSD_MR_NON_OVERLAP_SHIFT);
244
245 mask |= CLASSD_MR_NOVR_VAL_MASK;
246 switch (pdata->non_overlap_time) {
247 case 5:
248 val |= (CLASSD_MR_NOVR_VAL_5NS
249 << CLASSD_MR_NOVR_VAL_SHIFT);
250 break;
251 case 10:
252 val |= (CLASSD_MR_NOVR_VAL_10NS
253 << CLASSD_MR_NOVR_VAL_SHIFT);
254 break;
255 case 15:
256 val |= (CLASSD_MR_NOVR_VAL_15NS
257 << CLASSD_MR_NOVR_VAL_SHIFT);
258 break;
259 case 20:
260 val |= (CLASSD_MR_NOVR_VAL_20NS
261 << CLASSD_MR_NOVR_VAL_SHIFT);
262 break;
263 default:
264 val |= (CLASSD_MR_NOVR_VAL_10NS
265 << CLASSD_MR_NOVR_VAL_SHIFT);
266 dev_warn(component->dev,
267 "non-overlapping value %d is invalid, the default value 10 is specified\n",
268 pdata->non_overlap_time);
269 break;
270 }
271 }
272
273 snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
274
275 dev_info(component->dev,
276 "PWM modulation type is %s, non-overlapping is %s\n",
277 pwm_type[pdata->pwm_type],
278 pdata->non_overlap_enable?"enabled":"disabled");
279
280 return 0;
281}
282
283static int atmel_classd_component_resume(struct snd_soc_component *component)
284{
285 struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
286 struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
287
288 return regcache_sync(dd->regmap);
289}
290
291static int atmel_classd_cpu_dai_mute_stream(struct snd_soc_dai *cpu_dai,
292 int mute, int direction)
293{
294 struct snd_soc_component *component = cpu_dai->component;
295 u32 mask, val;
296
297 mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;
298
299 if (mute)
300 val = mask;
301 else
302 val = 0;
303
304 snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
305
306 return 0;
307}
308
309#define CLASSD_GCLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
310#define CLASSD_GCLK_RATE_12M288_MPY_8 (12288 * 1000 * 8)
311
312static struct {
313 int rate;
314 int sample_rate;
315 int dsp_clk;
316 unsigned long gclk_rate;
317} const sample_rates[] = {
318 { 8000, CLASSD_INTPMR_FRAME_8K,
319 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
320 { 16000, CLASSD_INTPMR_FRAME_16K,
321 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
322 { 32000, CLASSD_INTPMR_FRAME_32K,
323 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
324 { 48000, CLASSD_INTPMR_FRAME_48K,
325 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
326 { 96000, CLASSD_INTPMR_FRAME_96K,
327 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
328 { 22050, CLASSD_INTPMR_FRAME_22K,
329 CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
330 { 44100, CLASSD_INTPMR_FRAME_44K,
331 CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
332 { 88200, CLASSD_INTPMR_FRAME_88K,
333 CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
334};
335
336static int
337atmel_classd_cpu_dai_hw_params(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params *params,
339 struct snd_soc_dai *cpu_dai)
340{
341 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
342 struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
343 struct snd_soc_component *component = cpu_dai->component;
344 int fs;
345 int i, best, best_val, cur_val, ret;
346 u32 mask, val;
347
348 fs = params_rate(params);
349
350 best = 0;
351 best_val = abs(fs - sample_rates[0].rate);
352 for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
353 /* Closest match */
354 cur_val = abs(fs - sample_rates[i].rate);
355 if (cur_val < best_val) {
356 best = i;
357 best_val = cur_val;
358 }
359 }
360
361 dev_dbg(component->dev,
362 "Selected SAMPLE_RATE of %dHz, GCLK_RATE of %ldHz\n",
363 sample_rates[best].rate, sample_rates[best].gclk_rate);
364
365 clk_disable_unprepare(dd->gclk);
366
367 ret = clk_set_rate(dd->gclk, sample_rates[best].gclk_rate);
368 if (ret)
369 return ret;
370
371 mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK | CLASSD_INTPMR_FRAME_MASK;
372 val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
373 | (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);
374
375 snd_soc_component_update_bits(component, CLASSD_INTPMR, mask, val);
376
377 return clk_prepare_enable(dd->gclk);
378}
379
380static void
381atmel_classd_cpu_dai_shutdown(struct snd_pcm_substream *substream,
382 struct snd_soc_dai *cpu_dai)
383{
384 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
385 struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
386
387 clk_disable_unprepare(dd->gclk);
388}
389
390static int atmel_classd_cpu_dai_prepare(struct snd_pcm_substream *substream,
391 struct snd_soc_dai *cpu_dai)
392{
393 struct snd_soc_component *component = cpu_dai->component;
394
395 snd_soc_component_update_bits(component, CLASSD_MR,
396 CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK,
397 (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
398 |(CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT));
399
400 return 0;
401}
402
403static int atmel_classd_cpu_dai_trigger(struct snd_pcm_substream *substream,
404 int cmd, struct snd_soc_dai *cpu_dai)
405{
406 struct snd_soc_component *component = cpu_dai->component;
407 u32 mask, val;
408
409 mask = CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK;
410
411 switch (cmd) {
412 case SNDRV_PCM_TRIGGER_START:
413 case SNDRV_PCM_TRIGGER_RESUME:
414 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
415 val = mask;
416 break;
417 case SNDRV_PCM_TRIGGER_STOP:
418 case SNDRV_PCM_TRIGGER_SUSPEND:
419 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
420 val = (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
421 | (CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT);
422 break;
423 default:
424 return -EINVAL;
425 }
426
427 snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
428
429 return 0;
430}
431
432static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
433 .startup = atmel_classd_cpu_dai_startup,
434 .shutdown = atmel_classd_cpu_dai_shutdown,
435 .mute_stream = atmel_classd_cpu_dai_mute_stream,
436 .hw_params = atmel_classd_cpu_dai_hw_params,
437 .prepare = atmel_classd_cpu_dai_prepare,
438 .trigger = atmel_classd_cpu_dai_trigger,
439 .no_capture_mute = 1,
440};
441
442static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
443 .playback = {
444 .stream_name = "Playback",
445 .channels_min = 1,
446 .channels_max = 2,
447 .rates = ATMEL_CLASSD_RATES,
448 .formats = SNDRV_PCM_FMTBIT_S16_LE,
449 },
450 .ops = &atmel_classd_cpu_dai_ops,
451};
452
453static const struct snd_soc_component_driver atmel_classd_cpu_dai_component = {
454 .name = "atmel-classd",
455 .probe = atmel_classd_component_probe,
456 .resume = atmel_classd_component_resume,
457 .controls = atmel_classd_snd_controls,
458 .num_controls = ARRAY_SIZE(atmel_classd_snd_controls),
459 .idle_bias_on = 1,
460 .use_pmdown_time = 1,
461 .legacy_dai_naming = 1,
462};
463
464/* ASoC sound card */
465static int atmel_classd_asoc_card_init(struct device *dev,
466 struct snd_soc_card *card)
467{
468 struct snd_soc_dai_link *dai_link;
469 struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
470 struct snd_soc_dai_link_component *comp;
471
472 dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
473 if (!dai_link)
474 return -ENOMEM;
475
476 comp = devm_kzalloc(dev, 2 * sizeof(*comp), GFP_KERNEL);
477 if (!comp)
478 return -ENOMEM;
479
480 dai_link->cpus = &comp[0];
481 dai_link->codecs = &snd_soc_dummy_dlc;
482 dai_link->platforms = &comp[1];
483
484 dai_link->num_cpus = 1;
485 dai_link->num_codecs = 1;
486 dai_link->num_platforms = 1;
487
488 dai_link->name = "CLASSD";
489 dai_link->stream_name = "CLASSD PCM";
490 dai_link->cpus->dai_name = dev_name(dev);
491 dai_link->platforms->name = dev_name(dev);
492
493 card->dai_link = dai_link;
494 card->num_links = 1;
495 card->name = dd->pdata->card_name;
496 card->dev = dev;
497
498 return 0;
499};
500
501/* regmap configuration */
502static const struct reg_default atmel_classd_reg_defaults[] = {
503 { CLASSD_INTPMR, 0x00301212 },
504};
505
506#define ATMEL_CLASSD_REG_MAX 0xE4
507static const struct regmap_config atmel_classd_regmap_config = {
508 .reg_bits = 32,
509 .reg_stride = 4,
510 .val_bits = 32,
511 .max_register = ATMEL_CLASSD_REG_MAX,
512
513 .cache_type = REGCACHE_FLAT,
514 .reg_defaults = atmel_classd_reg_defaults,
515 .num_reg_defaults = ARRAY_SIZE(atmel_classd_reg_defaults),
516};
517
518static int atmel_classd_probe(struct platform_device *pdev)
519{
520 struct device *dev = &pdev->dev;
521 struct atmel_classd *dd;
522 struct resource *res;
523 void __iomem *io_base;
524 const struct atmel_classd_pdata *pdata;
525 struct snd_soc_card *card;
526 int ret;
527
528 pdata = dev_get_platdata(dev);
529 if (!pdata) {
530 pdata = atmel_classd_dt_init(dev);
531 if (IS_ERR(pdata))
532 return PTR_ERR(pdata);
533 }
534
535 dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
536 if (!dd)
537 return -ENOMEM;
538
539 dd->pdata = pdata;
540
541 dd->irq = platform_get_irq(pdev, 0);
542 if (dd->irq < 0)
543 return dd->irq;
544
545 dd->pclk = devm_clk_get(dev, "pclk");
546 if (IS_ERR(dd->pclk)) {
547 ret = PTR_ERR(dd->pclk);
548 dev_err(dev, "failed to get peripheral clock: %d\n", ret);
549 return ret;
550 }
551
552 dd->gclk = devm_clk_get(dev, "gclk");
553 if (IS_ERR(dd->gclk)) {
554 ret = PTR_ERR(dd->gclk);
555 dev_err(dev, "failed to get GCK clock: %d\n", ret);
556 return ret;
557 }
558
559 io_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
560 if (IS_ERR(io_base))
561 return PTR_ERR(io_base);
562
563 dd->phy_base = res->start;
564 dd->dev = dev;
565
566 dd->regmap = devm_regmap_init_mmio(dev, io_base,
567 &atmel_classd_regmap_config);
568 if (IS_ERR(dd->regmap)) {
569 ret = PTR_ERR(dd->regmap);
570 dev_err(dev, "failed to init register map: %d\n", ret);
571 return ret;
572 }
573
574 ret = devm_snd_soc_register_component(dev,
575 &atmel_classd_cpu_dai_component,
576 &atmel_classd_cpu_dai, 1);
577 if (ret) {
578 dev_err(dev, "could not register CPU DAI: %d\n", ret);
579 return ret;
580 }
581
582 ret = devm_snd_dmaengine_pcm_register(dev,
583 &atmel_classd_dmaengine_pcm_config,
584 0);
585 if (ret) {
586 dev_err(dev, "could not register platform: %d\n", ret);
587 return ret;
588 }
589
590 /* register sound card */
591 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
592 if (!card) {
593 ret = -ENOMEM;
594 goto unregister_codec;
595 }
596
597 snd_soc_card_set_drvdata(card, dd);
598
599 ret = atmel_classd_asoc_card_init(dev, card);
600 if (ret) {
601 dev_err(dev, "failed to init sound card\n");
602 goto unregister_codec;
603 }
604
605 ret = devm_snd_soc_register_card(dev, card);
606 if (ret) {
607 dev_err(dev, "failed to register sound card: %d\n", ret);
608 goto unregister_codec;
609 }
610
611 return 0;
612
613unregister_codec:
614 return ret;
615}
616
617static struct platform_driver atmel_classd_driver = {
618 .driver = {
619 .name = "atmel-classd",
620 .of_match_table = of_match_ptr(atmel_classd_of_match),
621 .pm = &snd_soc_pm_ops,
622 },
623 .probe = atmel_classd_probe,
624};
625module_platform_driver(atmel_classd_driver);
626
627MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
628MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
629MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
3 *
4 * Copyright (C) 2015 Atmel
5 *
6 * Author: Songjun Wu <songjun.wu@atmel.com>
7 */
8
9#include <linux/of.h>
10#include <linux/clk.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14#include <sound/core.h>
15#include <sound/dmaengine_pcm.h>
16#include <sound/pcm_params.h>
17#include <sound/tlv.h>
18#include "atmel-classd.h"
19
20struct atmel_classd_pdata {
21 bool non_overlap_enable;
22 int non_overlap_time;
23 int pwm_type;
24 const char *card_name;
25};
26
27struct atmel_classd {
28 dma_addr_t phy_base;
29 struct regmap *regmap;
30 struct clk *pclk;
31 struct clk *gclk;
32 struct device *dev;
33 int irq;
34 const struct atmel_classd_pdata *pdata;
35};
36
37#ifdef CONFIG_OF
38static const struct of_device_id atmel_classd_of_match[] = {
39 {
40 .compatible = "atmel,sama5d2-classd",
41 }, {
42 /* sentinel */
43 }
44};
45MODULE_DEVICE_TABLE(of, atmel_classd_of_match);
46
47static struct atmel_classd_pdata *atmel_classd_dt_init(struct device *dev)
48{
49 struct device_node *np = dev->of_node;
50 struct atmel_classd_pdata *pdata;
51 const char *pwm_type;
52 int ret;
53
54 if (!np) {
55 dev_err(dev, "device node not found\n");
56 return ERR_PTR(-EINVAL);
57 }
58
59 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
60 if (!pdata)
61 return ERR_PTR(-ENOMEM);
62
63 ret = of_property_read_string(np, "atmel,pwm-type", &pwm_type);
64 if ((ret == 0) && (strcmp(pwm_type, "diff") == 0))
65 pdata->pwm_type = CLASSD_MR_PWMTYP_DIFF;
66 else
67 pdata->pwm_type = CLASSD_MR_PWMTYP_SINGLE;
68
69 ret = of_property_read_u32(np,
70 "atmel,non-overlap-time", &pdata->non_overlap_time);
71 if (ret)
72 pdata->non_overlap_enable = false;
73 else
74 pdata->non_overlap_enable = true;
75
76 ret = of_property_read_string(np, "atmel,model", &pdata->card_name);
77 if (ret)
78 pdata->card_name = "CLASSD";
79
80 return pdata;
81}
82#else
83static inline struct atmel_classd_pdata *
84atmel_classd_dt_init(struct device *dev)
85{
86 return ERR_PTR(-EINVAL);
87}
88#endif
89
90#define ATMEL_CLASSD_RATES (SNDRV_PCM_RATE_8000 \
91 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 \
92 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 \
93 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 \
94 | SNDRV_PCM_RATE_96000)
95
96static const struct snd_pcm_hardware atmel_classd_hw = {
97 .info = SNDRV_PCM_INFO_MMAP
98 | SNDRV_PCM_INFO_MMAP_VALID
99 | SNDRV_PCM_INFO_INTERLEAVED
100 | SNDRV_PCM_INFO_RESUME
101 | SNDRV_PCM_INFO_PAUSE,
102 .formats = (SNDRV_PCM_FMTBIT_S16_LE),
103 .rates = ATMEL_CLASSD_RATES,
104 .rate_min = 8000,
105 .rate_max = 96000,
106 .channels_min = 1,
107 .channels_max = 2,
108 .buffer_bytes_max = 64 * 1024,
109 .period_bytes_min = 256,
110 .period_bytes_max = 32 * 1024,
111 .periods_min = 2,
112 .periods_max = 256,
113};
114
115#define ATMEL_CLASSD_PREALLOC_BUF_SIZE (64 * 1024)
116
117/* cpu dai component */
118static int atmel_classd_cpu_dai_startup(struct snd_pcm_substream *substream,
119 struct snd_soc_dai *cpu_dai)
120{
121 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
122 struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
123 int err;
124
125 regmap_write(dd->regmap, CLASSD_THR, 0x0);
126
127 err = clk_prepare_enable(dd->pclk);
128 if (err)
129 return err;
130 err = clk_prepare_enable(dd->gclk);
131 if (err) {
132 clk_disable_unprepare(dd->pclk);
133 return err;
134 }
135 return 0;
136}
137
138/* platform */
139static int
140atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
141 struct snd_pcm_hw_params *params,
142 struct dma_slave_config *slave_config)
143{
144 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
145 struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
146
147 if (params_physical_width(params) != 16) {
148 dev_err(dd->dev,
149 "only supports 16-bit audio data\n");
150 return -EINVAL;
151 }
152
153 if (params_channels(params) == 1)
154 slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
155 else
156 slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
157
158 slave_config->direction = DMA_MEM_TO_DEV;
159 slave_config->dst_addr = dd->phy_base + CLASSD_THR;
160 slave_config->dst_maxburst = 1;
161 slave_config->src_maxburst = 1;
162 slave_config->device_fc = false;
163
164 return 0;
165}
166
167static const struct snd_dmaengine_pcm_config
168atmel_classd_dmaengine_pcm_config = {
169 .prepare_slave_config = atmel_classd_platform_configure_dma,
170 .pcm_hardware = &atmel_classd_hw,
171 .prealloc_buffer_size = ATMEL_CLASSD_PREALLOC_BUF_SIZE,
172};
173
174/* codec */
175static const char * const mono_mode_text[] = {
176 "mix", "sat", "left", "right"
177};
178
179static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
180 CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
181 mono_mode_text);
182
183static const char * const eqcfg_text[] = {
184 "Treble-12dB", "Treble-6dB",
185 "Medium-8dB", "Medium-3dB",
186 "Bass-12dB", "Bass-6dB",
187 "0 dB",
188 "Bass+6dB", "Bass+12dB",
189 "Medium+3dB", "Medium+8dB",
190 "Treble+6dB", "Treble+12dB",
191};
192
193static const unsigned int eqcfg_value[] = {
194 CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
195 CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
196 CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
197 CLASSD_INTPMR_EQCFG_FLAT,
198 CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
199 CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
200 CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
201};
202
203static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
204 CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
205 eqcfg_text, eqcfg_value);
206
207static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);
208
209static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
210SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
211 CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
212 78, 1, classd_digital_tlv),
213
214SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
215 CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),
216
217SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),
218
219SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),
220
221SOC_ENUM("Mono Mode", classd_mono_mode_enum),
222
223SOC_ENUM("EQ", classd_eqcfg_enum),
224};
225
226static const char * const pwm_type[] = {
227 "Single ended", "Differential"
228};
229
230static int atmel_classd_component_probe(struct snd_soc_component *component)
231{
232 struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
233 struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
234 const struct atmel_classd_pdata *pdata = dd->pdata;
235 u32 mask, val;
236
237 mask = CLASSD_MR_PWMTYP_MASK;
238 val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;
239
240 mask |= CLASSD_MR_NON_OVERLAP_MASK;
241 if (pdata->non_overlap_enable) {
242 val |= (CLASSD_MR_NON_OVERLAP_EN
243 << CLASSD_MR_NON_OVERLAP_SHIFT);
244
245 mask |= CLASSD_MR_NOVR_VAL_MASK;
246 switch (pdata->non_overlap_time) {
247 case 5:
248 val |= (CLASSD_MR_NOVR_VAL_5NS
249 << CLASSD_MR_NOVR_VAL_SHIFT);
250 break;
251 case 10:
252 val |= (CLASSD_MR_NOVR_VAL_10NS
253 << CLASSD_MR_NOVR_VAL_SHIFT);
254 break;
255 case 15:
256 val |= (CLASSD_MR_NOVR_VAL_15NS
257 << CLASSD_MR_NOVR_VAL_SHIFT);
258 break;
259 case 20:
260 val |= (CLASSD_MR_NOVR_VAL_20NS
261 << CLASSD_MR_NOVR_VAL_SHIFT);
262 break;
263 default:
264 val |= (CLASSD_MR_NOVR_VAL_10NS
265 << CLASSD_MR_NOVR_VAL_SHIFT);
266 dev_warn(component->dev,
267 "non-overlapping value %d is invalid, the default value 10 is specified\n",
268 pdata->non_overlap_time);
269 break;
270 }
271 }
272
273 snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
274
275 dev_info(component->dev,
276 "PWM modulation type is %s, non-overlapping is %s\n",
277 pwm_type[pdata->pwm_type],
278 pdata->non_overlap_enable?"enabled":"disabled");
279
280 return 0;
281}
282
283static int atmel_classd_component_resume(struct snd_soc_component *component)
284{
285 struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
286 struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
287
288 return regcache_sync(dd->regmap);
289}
290
291static int atmel_classd_cpu_dai_mute_stream(struct snd_soc_dai *cpu_dai,
292 int mute, int direction)
293{
294 struct snd_soc_component *component = cpu_dai->component;
295 u32 mask, val;
296
297 mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;
298
299 if (mute)
300 val = mask;
301 else
302 val = 0;
303
304 snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
305
306 return 0;
307}
308
309#define CLASSD_GCLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
310#define CLASSD_GCLK_RATE_12M288_MPY_8 (12288 * 1000 * 8)
311
312static struct {
313 int rate;
314 int sample_rate;
315 int dsp_clk;
316 unsigned long gclk_rate;
317} const sample_rates[] = {
318 { 8000, CLASSD_INTPMR_FRAME_8K,
319 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
320 { 16000, CLASSD_INTPMR_FRAME_16K,
321 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
322 { 32000, CLASSD_INTPMR_FRAME_32K,
323 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
324 { 48000, CLASSD_INTPMR_FRAME_48K,
325 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
326 { 96000, CLASSD_INTPMR_FRAME_96K,
327 CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
328 { 22050, CLASSD_INTPMR_FRAME_22K,
329 CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
330 { 44100, CLASSD_INTPMR_FRAME_44K,
331 CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
332 { 88200, CLASSD_INTPMR_FRAME_88K,
333 CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
334};
335
336static int
337atmel_classd_cpu_dai_hw_params(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params *params,
339 struct snd_soc_dai *cpu_dai)
340{
341 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
342 struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
343 struct snd_soc_component *component = cpu_dai->component;
344 int fs;
345 int i, best, best_val, cur_val, ret;
346 u32 mask, val;
347
348 fs = params_rate(params);
349
350 best = 0;
351 best_val = abs(fs - sample_rates[0].rate);
352 for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
353 /* Closest match */
354 cur_val = abs(fs - sample_rates[i].rate);
355 if (cur_val < best_val) {
356 best = i;
357 best_val = cur_val;
358 }
359 }
360
361 dev_dbg(component->dev,
362 "Selected SAMPLE_RATE of %dHz, GCLK_RATE of %ldHz\n",
363 sample_rates[best].rate, sample_rates[best].gclk_rate);
364
365 clk_disable_unprepare(dd->gclk);
366
367 ret = clk_set_rate(dd->gclk, sample_rates[best].gclk_rate);
368 if (ret)
369 return ret;
370
371 mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK | CLASSD_INTPMR_FRAME_MASK;
372 val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
373 | (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);
374
375 snd_soc_component_update_bits(component, CLASSD_INTPMR, mask, val);
376
377 return clk_prepare_enable(dd->gclk);
378}
379
380static void
381atmel_classd_cpu_dai_shutdown(struct snd_pcm_substream *substream,
382 struct snd_soc_dai *cpu_dai)
383{
384 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
385 struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
386
387 clk_disable_unprepare(dd->gclk);
388}
389
390static int atmel_classd_cpu_dai_prepare(struct snd_pcm_substream *substream,
391 struct snd_soc_dai *cpu_dai)
392{
393 struct snd_soc_component *component = cpu_dai->component;
394
395 snd_soc_component_update_bits(component, CLASSD_MR,
396 CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK,
397 (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
398 |(CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT));
399
400 return 0;
401}
402
403static int atmel_classd_cpu_dai_trigger(struct snd_pcm_substream *substream,
404 int cmd, struct snd_soc_dai *cpu_dai)
405{
406 struct snd_soc_component *component = cpu_dai->component;
407 u32 mask, val;
408
409 mask = CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK;
410
411 switch (cmd) {
412 case SNDRV_PCM_TRIGGER_START:
413 case SNDRV_PCM_TRIGGER_RESUME:
414 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
415 val = mask;
416 break;
417 case SNDRV_PCM_TRIGGER_STOP:
418 case SNDRV_PCM_TRIGGER_SUSPEND:
419 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
420 val = (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
421 | (CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT);
422 break;
423 default:
424 return -EINVAL;
425 }
426
427 snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
428
429 return 0;
430}
431
432static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
433 .startup = atmel_classd_cpu_dai_startup,
434 .shutdown = atmel_classd_cpu_dai_shutdown,
435 .mute_stream = atmel_classd_cpu_dai_mute_stream,
436 .hw_params = atmel_classd_cpu_dai_hw_params,
437 .prepare = atmel_classd_cpu_dai_prepare,
438 .trigger = atmel_classd_cpu_dai_trigger,
439 .no_capture_mute = 1,
440};
441
442static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
443 .playback = {
444 .stream_name = "Playback",
445 .channels_min = 1,
446 .channels_max = 2,
447 .rates = ATMEL_CLASSD_RATES,
448 .formats = SNDRV_PCM_FMTBIT_S16_LE,
449 },
450 .ops = &atmel_classd_cpu_dai_ops,
451};
452
453static const struct snd_soc_component_driver atmel_classd_cpu_dai_component = {
454 .name = "atmel-classd",
455 .probe = atmel_classd_component_probe,
456 .resume = atmel_classd_component_resume,
457 .controls = atmel_classd_snd_controls,
458 .num_controls = ARRAY_SIZE(atmel_classd_snd_controls),
459 .idle_bias_on = 1,
460 .use_pmdown_time = 1,
461 .endianness = 1,
462};
463
464/* ASoC sound card */
465static int atmel_classd_asoc_card_init(struct device *dev,
466 struct snd_soc_card *card)
467{
468 struct snd_soc_dai_link *dai_link;
469 struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
470 struct snd_soc_dai_link_component *comp;
471
472 dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
473 if (!dai_link)
474 return -ENOMEM;
475
476 comp = devm_kzalloc(dev, 3 * sizeof(*comp), GFP_KERNEL);
477 if (!comp)
478 return -ENOMEM;
479
480 dai_link->cpus = &comp[0];
481 dai_link->codecs = &comp[1];
482 dai_link->platforms = &comp[2];
483
484 dai_link->num_cpus = 1;
485 dai_link->num_codecs = 1;
486 dai_link->num_platforms = 1;
487
488 dai_link->name = "CLASSD";
489 dai_link->stream_name = "CLASSD PCM";
490 dai_link->codecs->dai_name = "snd-soc-dummy-dai";
491 dai_link->cpus->dai_name = dev_name(dev);
492 dai_link->codecs->name = "snd-soc-dummy";
493 dai_link->platforms->name = dev_name(dev);
494
495 card->dai_link = dai_link;
496 card->num_links = 1;
497 card->name = dd->pdata->card_name;
498 card->dev = dev;
499
500 return 0;
501};
502
503/* regmap configuration */
504static const struct reg_default atmel_classd_reg_defaults[] = {
505 { CLASSD_INTPMR, 0x00301212 },
506};
507
508#define ATMEL_CLASSD_REG_MAX 0xE4
509static const struct regmap_config atmel_classd_regmap_config = {
510 .reg_bits = 32,
511 .reg_stride = 4,
512 .val_bits = 32,
513 .max_register = ATMEL_CLASSD_REG_MAX,
514
515 .cache_type = REGCACHE_FLAT,
516 .reg_defaults = atmel_classd_reg_defaults,
517 .num_reg_defaults = ARRAY_SIZE(atmel_classd_reg_defaults),
518};
519
520static int atmel_classd_probe(struct platform_device *pdev)
521{
522 struct device *dev = &pdev->dev;
523 struct atmel_classd *dd;
524 struct resource *res;
525 void __iomem *io_base;
526 const struct atmel_classd_pdata *pdata;
527 struct snd_soc_card *card;
528 int ret;
529
530 pdata = dev_get_platdata(dev);
531 if (!pdata) {
532 pdata = atmel_classd_dt_init(dev);
533 if (IS_ERR(pdata))
534 return PTR_ERR(pdata);
535 }
536
537 dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
538 if (!dd)
539 return -ENOMEM;
540
541 dd->pdata = pdata;
542
543 dd->irq = platform_get_irq(pdev, 0);
544 if (dd->irq < 0)
545 return dd->irq;
546
547 dd->pclk = devm_clk_get(dev, "pclk");
548 if (IS_ERR(dd->pclk)) {
549 ret = PTR_ERR(dd->pclk);
550 dev_err(dev, "failed to get peripheral clock: %d\n", ret);
551 return ret;
552 }
553
554 dd->gclk = devm_clk_get(dev, "gclk");
555 if (IS_ERR(dd->gclk)) {
556 ret = PTR_ERR(dd->gclk);
557 dev_err(dev, "failed to get GCK clock: %d\n", ret);
558 return ret;
559 }
560
561 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
562 io_base = devm_ioremap_resource(dev, res);
563 if (IS_ERR(io_base))
564 return PTR_ERR(io_base);
565
566 dd->phy_base = res->start;
567 dd->dev = dev;
568
569 dd->regmap = devm_regmap_init_mmio(dev, io_base,
570 &atmel_classd_regmap_config);
571 if (IS_ERR(dd->regmap)) {
572 ret = PTR_ERR(dd->regmap);
573 dev_err(dev, "failed to init register map: %d\n", ret);
574 return ret;
575 }
576
577 ret = devm_snd_soc_register_component(dev,
578 &atmel_classd_cpu_dai_component,
579 &atmel_classd_cpu_dai, 1);
580 if (ret) {
581 dev_err(dev, "could not register CPU DAI: %d\n", ret);
582 return ret;
583 }
584
585 ret = devm_snd_dmaengine_pcm_register(dev,
586 &atmel_classd_dmaengine_pcm_config,
587 0);
588 if (ret) {
589 dev_err(dev, "could not register platform: %d\n", ret);
590 return ret;
591 }
592
593 /* register sound card */
594 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
595 if (!card) {
596 ret = -ENOMEM;
597 goto unregister_codec;
598 }
599
600 snd_soc_card_set_drvdata(card, dd);
601
602 ret = atmel_classd_asoc_card_init(dev, card);
603 if (ret) {
604 dev_err(dev, "failed to init sound card\n");
605 goto unregister_codec;
606 }
607
608 ret = devm_snd_soc_register_card(dev, card);
609 if (ret) {
610 dev_err(dev, "failed to register sound card: %d\n", ret);
611 goto unregister_codec;
612 }
613
614 return 0;
615
616unregister_codec:
617 return ret;
618}
619
620static int atmel_classd_remove(struct platform_device *pdev)
621{
622 return 0;
623}
624
625static struct platform_driver atmel_classd_driver = {
626 .driver = {
627 .name = "atmel-classd",
628 .of_match_table = of_match_ptr(atmel_classd_of_match),
629 .pm = &snd_soc_pm_ops,
630 },
631 .probe = atmel_classd_probe,
632 .remove = atmel_classd_remove,
633};
634module_platform_driver(atmel_classd_driver);
635
636MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
637MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
638MODULE_LICENSE("GPL");