1 /*
2 * Renesas Sampling Rate Convert Sound Card for DPCM
3 *
4 * Copyright (C) 2015 Renesas Solutions Corp.
5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 *
7 * based on ${LINUX}/sound/soc/generic/simple-card.c
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/clk.h>
14 #include <linux/device.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/of_device.h>
18 #include <linux/platform_device.h>
19 #include <linux/string.h>
20 #include <sound/jack.h>
21 #include <sound/soc.h>
22 #include <sound/soc-dai.h>
23
24 struct rsrc_card_of_data {
25 const char *prefix;
26 const struct snd_soc_dapm_route *routes;
27 int num_routes;
28 };
29
30 static const struct snd_soc_dapm_route routes_ssi0_ak4642[] = {
31 {"ak4642 Playback", NULL, "DAI0 Playback"},
32 {"DAI0 Capture", NULL, "ak4642 Capture"},
33 };
34
35 static const struct rsrc_card_of_data routes_of_ssi0_ak4642 = {
36 .prefix = "ak4642",
37 .routes = routes_ssi0_ak4642,
38 .num_routes = ARRAY_SIZE(routes_ssi0_ak4642),
39 };
40
41 static const struct of_device_id rsrc_card_of_match[] = {
42 { .compatible = "renesas,rsrc-card,lager", .data = &routes_of_ssi0_ak4642 },
43 { .compatible = "renesas,rsrc-card,koelsch", .data = &routes_of_ssi0_ak4642 },
44 { .compatible = "renesas,rsrc-card", },
45 {},
46 };
47 MODULE_DEVICE_TABLE(of, rsrc_card_of_match);
48
49 #define DAI_NAME_NUM 32
50 struct rsrc_card_dai {
51 unsigned int fmt;
52 unsigned int sysclk;
53 struct clk *clk;
54 char dai_name[DAI_NAME_NUM];
55 };
56
57 #define IDX_CPU 0
58 #define IDX_CODEC 1
59 struct rsrc_card_priv {
60 struct snd_soc_card snd_card;
61 struct snd_soc_codec_conf codec_conf;
62 struct rsrc_card_dai *dai_props;
63 struct snd_soc_dai_link *dai_link;
64 int dai_num;
65 u32 convert_rate;
66 };
67
68 #define rsrc_priv_to_dev(priv) ((priv)->snd_card.dev)
69 #define rsrc_priv_to_link(priv, i) ((priv)->snd_card.dai_link + (i))
70 #define rsrc_priv_to_props(priv, i) ((priv)->dai_props + (i))
71 #define rsrc_dev_to_of_data(dev) (of_match_device(rsrc_card_of_match, (dev))->data)
72
rsrc_card_startup(struct snd_pcm_substream * substream)73 static int rsrc_card_startup(struct snd_pcm_substream *substream)
74 {
75 struct snd_soc_pcm_runtime *rtd = substream->private_data;
76 struct rsrc_card_priv *priv = snd_soc_card_get_drvdata(rtd->card);
77 struct rsrc_card_dai *dai_props =
78 rsrc_priv_to_props(priv, rtd - rtd->card->rtd);
79
80 return clk_prepare_enable(dai_props->clk);
81 }
82
rsrc_card_shutdown(struct snd_pcm_substream * substream)83 static void rsrc_card_shutdown(struct snd_pcm_substream *substream)
84 {
85 struct snd_soc_pcm_runtime *rtd = substream->private_data;
86 struct rsrc_card_priv *priv = snd_soc_card_get_drvdata(rtd->card);
87 struct rsrc_card_dai *dai_props =
88 rsrc_priv_to_props(priv, rtd - rtd->card->rtd);
89
90 clk_disable_unprepare(dai_props->clk);
91 }
92
93 static struct snd_soc_ops rsrc_card_ops = {
94 .startup = rsrc_card_startup,
95 .shutdown = rsrc_card_shutdown,
96 };
97
rsrc_card_dai_init(struct snd_soc_pcm_runtime * rtd)98 static int rsrc_card_dai_init(struct snd_soc_pcm_runtime *rtd)
99 {
100 struct rsrc_card_priv *priv = snd_soc_card_get_drvdata(rtd->card);
101 struct snd_soc_dai *dai;
102 struct snd_soc_dai_link *dai_link;
103 struct rsrc_card_dai *dai_props;
104 int num = rtd - rtd->card->rtd;
105 int ret;
106
107 dai_link = rsrc_priv_to_link(priv, num);
108 dai_props = rsrc_priv_to_props(priv, num);
109 dai = dai_link->dynamic ?
110 rtd->cpu_dai :
111 rtd->codec_dai;
112
113 if (dai_props->fmt) {
114 ret = snd_soc_dai_set_fmt(dai, dai_props->fmt);
115 if (ret && ret != -ENOTSUPP) {
116 dev_err(dai->dev, "set_fmt error\n");
117 goto err;
118 }
119 }
120
121 if (dai_props->sysclk) {
122 ret = snd_soc_dai_set_sysclk(dai, 0, dai_props->sysclk, 0);
123 if (ret && ret != -ENOTSUPP) {
124 dev_err(dai->dev, "set_sysclk error\n");
125 goto err;
126 }
127 }
128
129 ret = 0;
130
131 err:
132 return ret;
133 }
134
rsrc_card_be_hw_params_fixup(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_hw_params * params)135 static int rsrc_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
136 struct snd_pcm_hw_params *params)
137 {
138 struct rsrc_card_priv *priv = snd_soc_card_get_drvdata(rtd->card);
139 struct snd_interval *rate = hw_param_interval(params,
140 SNDRV_PCM_HW_PARAM_RATE);
141
142 if (!priv->convert_rate)
143 return 0;
144
145 rate->min = rate->max = priv->convert_rate;
146
147 return 0;
148 }
149
rsrc_card_parse_daifmt(struct device_node * node,struct device_node * np,struct rsrc_card_priv * priv,int idx,bool is_fe)150 static int rsrc_card_parse_daifmt(struct device_node *node,
151 struct device_node *np,
152 struct rsrc_card_priv *priv,
153 int idx, bool is_fe)
154 {
155 struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
156 struct device_node *bitclkmaster = NULL;
157 struct device_node *framemaster = NULL;
158 struct device_node *codec = is_fe ? NULL : np;
159 unsigned int daifmt;
160
161 daifmt = snd_soc_of_parse_daifmt(node, NULL,
162 &bitclkmaster, &framemaster);
163 daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
164
165 if (!bitclkmaster && !framemaster)
166 return -EINVAL;
167
168 if (codec == bitclkmaster)
169 daifmt |= (codec == framemaster) ?
170 SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
171 else
172 daifmt |= (codec == framemaster) ?
173 SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
174
175 dai_props->fmt = daifmt;
176
177 of_node_put(bitclkmaster);
178 of_node_put(framemaster);
179
180 return 0;
181 }
182
rsrc_card_parse_links(struct device_node * np,struct rsrc_card_priv * priv,int idx,bool is_fe)183 static int rsrc_card_parse_links(struct device_node *np,
184 struct rsrc_card_priv *priv,
185 int idx, bool is_fe)
186 {
187 struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
188 struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
189 struct of_phandle_args args;
190 int ret;
191
192 /*
193 * Get node via "sound-dai = <&phandle port>"
194 * it will be used as xxx_of_node on soc_bind_dai_link()
195 */
196 ret = of_parse_phandle_with_args(np, "sound-dai",
197 "#sound-dai-cells", 0, &args);
198 if (ret)
199 return ret;
200
201 if (is_fe) {
202 /* BE is dummy */
203 dai_link->codec_of_node = NULL;
204 dai_link->codec_dai_name = "snd-soc-dummy-dai";
205 dai_link->codec_name = "snd-soc-dummy";
206
207 /* FE settings */
208 dai_link->dynamic = 1;
209 dai_link->dpcm_merged_format = 1;
210 dai_link->cpu_of_node = args.np;
211 snd_soc_of_get_dai_name(np, &dai_link->cpu_dai_name);
212
213 /* set dai_name */
214 snprintf(dai_props->dai_name, DAI_NAME_NUM, "fe.%s",
215 dai_link->cpu_dai_name);
216
217 /*
218 * In soc_bind_dai_link() will check cpu name after
219 * of_node matching if dai_link has cpu_dai_name.
220 * but, it will never match if name was created by
221 * fmt_single_name() remove cpu_dai_name if cpu_args
222 * was 0. See:
223 * fmt_single_name()
224 * fmt_multiple_name()
225 */
226 if (!args.args_count)
227 dai_link->cpu_dai_name = NULL;
228 } else {
229 struct device *dev = rsrc_priv_to_dev(priv);
230 const struct rsrc_card_of_data *of_data;
231
232 of_data = rsrc_dev_to_of_data(dev);
233
234 /* FE is dummy */
235 dai_link->cpu_of_node = NULL;
236 dai_link->cpu_dai_name = "snd-soc-dummy-dai";
237 dai_link->cpu_name = "snd-soc-dummy";
238
239 /* BE settings */
240 dai_link->no_pcm = 1;
241 dai_link->be_hw_params_fixup = rsrc_card_be_hw_params_fixup;
242 dai_link->codec_of_node = args.np;
243 snd_soc_of_get_dai_name(np, &dai_link->codec_dai_name);
244
245 /* additional name prefix */
246 if (of_data) {
247 priv->codec_conf.of_node = dai_link->codec_of_node;
248 priv->codec_conf.name_prefix = of_data->prefix;
249 } else {
250 snd_soc_of_parse_audio_prefix(&priv->snd_card,
251 &priv->codec_conf,
252 dai_link->codec_of_node,
253 "audio-prefix");
254 }
255
256 /* set dai_name */
257 snprintf(dai_props->dai_name, DAI_NAME_NUM, "be.%s",
258 dai_link->codec_dai_name);
259 }
260
261 /* Simple Card assumes platform == cpu */
262 dai_link->platform_of_node = dai_link->cpu_of_node;
263 dai_link->dpcm_playback = 1;
264 dai_link->dpcm_capture = 1;
265 dai_link->name = dai_props->dai_name;
266 dai_link->stream_name = dai_props->dai_name;
267 dai_link->ops = &rsrc_card_ops;
268 dai_link->init = rsrc_card_dai_init;
269
270 return 0;
271 }
272
rsrc_card_parse_clk(struct device_node * np,struct rsrc_card_priv * priv,int idx,bool is_fe)273 static int rsrc_card_parse_clk(struct device_node *np,
274 struct rsrc_card_priv *priv,
275 int idx, bool is_fe)
276 {
277 struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
278 struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
279 struct clk *clk;
280 struct device_node *of_np = is_fe ? dai_link->cpu_of_node :
281 dai_link->codec_of_node;
282 u32 val;
283
284 /*
285 * Parse dai->sysclk come from "clocks = <&xxx>"
286 * (if system has common clock)
287 * or "system-clock-frequency = <xxx>"
288 * or device's module clock.
289 */
290 if (of_property_read_bool(np, "clocks")) {
291 clk = of_clk_get(np, 0);
292 if (IS_ERR(clk))
293 return PTR_ERR(clk);
294
295 dai_props->sysclk = clk_get_rate(clk);
296 dai_props->clk = clk;
297 } else if (!of_property_read_u32(np, "system-clock-frequency", &val)) {
298 dai_props->sysclk = val;
299 } else {
300 clk = of_clk_get(of_np, 0);
301 if (!IS_ERR(clk))
302 dai_props->sysclk = clk_get_rate(clk);
303 }
304
305 return 0;
306 }
307
rsrc_card_dai_link_of(struct device_node * node,struct device_node * np,struct rsrc_card_priv * priv,int idx)308 static int rsrc_card_dai_link_of(struct device_node *node,
309 struct device_node *np,
310 struct rsrc_card_priv *priv,
311 int idx)
312 {
313 struct device *dev = rsrc_priv_to_dev(priv);
314 struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
315 bool is_fe = false;
316 int ret;
317
318 if (0 == strcmp(np->name, "cpu"))
319 is_fe = true;
320
321 ret = rsrc_card_parse_daifmt(node, np, priv, idx, is_fe);
322 if (ret < 0)
323 return ret;
324
325 ret = rsrc_card_parse_links(np, priv, idx, is_fe);
326 if (ret < 0)
327 return ret;
328
329 ret = rsrc_card_parse_clk(np, priv, idx, is_fe);
330 if (ret < 0)
331 return ret;
332
333 dev_dbg(dev, "\t%s / %04x / %d\n",
334 dai_props->dai_name,
335 dai_props->fmt,
336 dai_props->sysclk);
337
338 return ret;
339 }
340
rsrc_card_parse_of(struct device_node * node,struct rsrc_card_priv * priv,struct device * dev)341 static int rsrc_card_parse_of(struct device_node *node,
342 struct rsrc_card_priv *priv,
343 struct device *dev)
344 {
345 const struct rsrc_card_of_data *of_data = rsrc_dev_to_of_data(dev);
346 struct rsrc_card_dai *props;
347 struct snd_soc_dai_link *links;
348 struct device_node *np;
349 int ret;
350 int i, num;
351
352 if (!node)
353 return -EINVAL;
354
355 num = of_get_child_count(node);
356 props = devm_kzalloc(dev, sizeof(*props) * num, GFP_KERNEL);
357 links = devm_kzalloc(dev, sizeof(*links) * num, GFP_KERNEL);
358 if (!props || !links)
359 return -ENOMEM;
360
361 priv->dai_props = props;
362 priv->dai_link = links;
363 priv->dai_num = num;
364
365 /* Init snd_soc_card */
366 priv->snd_card.owner = THIS_MODULE;
367 priv->snd_card.dev = dev;
368 priv->snd_card.dai_link = priv->dai_link;
369 priv->snd_card.num_links = num;
370 priv->snd_card.codec_conf = &priv->codec_conf;
371 priv->snd_card.num_configs = 1;
372
373 if (of_data) {
374 priv->snd_card.of_dapm_routes = of_data->routes;
375 priv->snd_card.num_of_dapm_routes = of_data->num_routes;
376 } else {
377 snd_soc_of_parse_audio_routing(&priv->snd_card,
378 "audio-routing");
379 }
380
381 /* Parse the card name from DT */
382 snd_soc_of_parse_card_name(&priv->snd_card, "card-name");
383
384 /* sampling rate convert */
385 of_property_read_u32(node, "convert-rate", &priv->convert_rate);
386
387 dev_dbg(dev, "New rsrc-audio-card: %s (%d)\n",
388 priv->snd_card.name ? priv->snd_card.name : "",
389 priv->convert_rate);
390
391 i = 0;
392 for_each_child_of_node(node, np) {
393 ret = rsrc_card_dai_link_of(node, np, priv, i);
394 if (ret < 0)
395 return ret;
396 i++;
397 }
398
399 if (!priv->snd_card.name)
400 priv->snd_card.name = priv->snd_card.dai_link->name;
401
402 return 0;
403 }
404
405 /* Decrease the reference count of the device nodes */
rsrc_card_unref(struct snd_soc_card * card)406 static int rsrc_card_unref(struct snd_soc_card *card)
407 {
408 struct snd_soc_dai_link *dai_link;
409 int num_links;
410
411 for (num_links = 0, dai_link = card->dai_link;
412 num_links < card->num_links;
413 num_links++, dai_link++) {
414 of_node_put(dai_link->cpu_of_node);
415 of_node_put(dai_link->codec_of_node);
416 }
417 return 0;
418 }
419
rsrc_card_probe(struct platform_device * pdev)420 static int rsrc_card_probe(struct platform_device *pdev)
421 {
422 struct rsrc_card_priv *priv;
423 struct device_node *np = pdev->dev.of_node;
424 struct device *dev = &pdev->dev;
425 int ret;
426
427 /* Allocate the private data */
428 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
429 if (!priv)
430 return -ENOMEM;
431
432 ret = rsrc_card_parse_of(np, priv, dev);
433 if (ret < 0) {
434 if (ret != -EPROBE_DEFER)
435 dev_err(dev, "parse error %d\n", ret);
436 goto err;
437 }
438
439 snd_soc_card_set_drvdata(&priv->snd_card, priv);
440
441 ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
442 if (ret >= 0)
443 return ret;
444 err:
445 rsrc_card_unref(&priv->snd_card);
446
447 return ret;
448 }
449
rsrc_card_remove(struct platform_device * pdev)450 static int rsrc_card_remove(struct platform_device *pdev)
451 {
452 struct snd_soc_card *card = platform_get_drvdata(pdev);
453
454 return rsrc_card_unref(card);
455 }
456
457 static struct platform_driver rsrc_card = {
458 .driver = {
459 .name = "renesas-src-audio-card",
460 .of_match_table = rsrc_card_of_match,
461 },
462 .probe = rsrc_card_probe,
463 .remove = rsrc_card_remove,
464 };
465
466 module_platform_driver(rsrc_card);
467
468 MODULE_ALIAS("platform:renesas-src-audio-card");
469 MODULE_LICENSE("GPL");
470 MODULE_DESCRIPTION("Renesas Sampling Rate Convert Sound Card");
471 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
472