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Linux/sound/soc/generic/simple-card.c

  1 /*
  2  * ASoC simple sound card support
  3  *
  4  * Copyright (C) 2012 Renesas Solutions Corp.
  5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.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 as
  9  * published by the Free Software Foundation.
 10  */
 11 #include <linux/clk.h>
 12 #include <linux/module.h>
 13 #include <linux/of.h>
 14 #include <linux/platform_device.h>
 15 #include <linux/string.h>
 16 #include <sound/simple_card.h>
 17 
 18 static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
 19                                        struct asoc_simple_dai *set,
 20                                        unsigned int daifmt)
 21 {
 22         int ret = 0;
 23 
 24         daifmt |= set->fmt;
 25 
 26         if (daifmt)
 27                 ret = snd_soc_dai_set_fmt(dai, daifmt);
 28 
 29         if (ret == -ENOTSUPP) {
 30                 dev_dbg(dai->dev, "ASoC: set_fmt is not supported\n");
 31                 ret = 0;
 32         }
 33 
 34         if (!ret && set->sysclk)
 35                 ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
 36 
 37         return ret;
 38 }
 39 
 40 static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
 41 {
 42         struct asoc_simple_card_info *info =
 43                                 snd_soc_card_get_drvdata(rtd->card);
 44         struct snd_soc_dai *codec = rtd->codec_dai;
 45         struct snd_soc_dai *cpu = rtd->cpu_dai;
 46         unsigned int daifmt = info->daifmt;
 47         int ret;
 48 
 49         ret = __asoc_simple_card_dai_init(codec, &info->codec_dai, daifmt);
 50         if (ret < 0)
 51                 return ret;
 52 
 53         ret = __asoc_simple_card_dai_init(cpu, &info->cpu_dai, daifmt);
 54         if (ret < 0)
 55                 return ret;
 56 
 57         return 0;
 58 }
 59 
 60 static int
 61 asoc_simple_card_sub_parse_of(struct device_node *np,
 62                               struct asoc_simple_dai *dai,
 63                               struct device_node **node)
 64 {
 65         struct clk *clk;
 66         int ret;
 67 
 68         /*
 69          * get node via "sound-dai = <&phandle port>"
 70          * it will be used as xxx_of_node on soc_bind_dai_link()
 71          */
 72         *node = of_parse_phandle(np, "sound-dai", 0);
 73         if (!*node)
 74                 return -ENODEV;
 75 
 76         /* get dai->name */
 77         ret = snd_soc_of_get_dai_name(np, &dai->name);
 78         if (ret < 0)
 79                 goto parse_error;
 80 
 81         /*
 82          * bitclock-inversion, frame-inversion
 83          * bitclock-master,    frame-master
 84          * and specific "format" if it has
 85          */
 86         dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
 87 
 88         /*
 89          * dai->sysclk come from
 90          *  "clocks = <&xxx>" (if system has common clock)
 91          *  or "system-clock-frequency = <xxx>"
 92          *  or device's module clock.
 93          */
 94         if (of_property_read_bool(np, "clocks")) {
 95                 clk = of_clk_get(np, 0);
 96                 if (IS_ERR(clk)) {
 97                         ret = PTR_ERR(clk);
 98                         goto parse_error;
 99                 }
100 
101                 dai->sysclk = clk_get_rate(clk);
102         } else if (of_property_read_bool(np, "system-clock-frequency")) {
103                 of_property_read_u32(np,
104                                      "system-clock-frequency",
105                                      &dai->sysclk);
106         } else {
107                 clk = of_clk_get(*node, 0);
108                 if (!IS_ERR(clk))
109                         dai->sysclk = clk_get_rate(clk);
110         }
111 
112         ret = 0;
113 
114 parse_error:
115         of_node_put(*node);
116 
117         return ret;
118 }
119 
120 static int asoc_simple_card_parse_of(struct device_node *node,
121                                      struct asoc_simple_card_info *info,
122                                      struct device *dev,
123                                      struct device_node **of_cpu,
124                                      struct device_node **of_codec,
125                                      struct device_node **of_platform)
126 {
127         struct device_node *np;
128         char *name;
129         int ret;
130 
131         /* get CPU/CODEC common format via simple-audio-card,format */
132         info->daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
133                 (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);
134 
135         /* DAPM routes */
136         if (of_property_read_bool(node, "simple-audio-card,routing")) {
137                 ret = snd_soc_of_parse_audio_routing(&info->snd_card,
138                                         "simple-audio-card,routing");
139                 if (ret)
140                         return ret;
141         }
142 
143         /* CPU sub-node */
144         ret = -EINVAL;
145         np = of_get_child_by_name(node, "simple-audio-card,cpu");
146         if (np)
147                 ret = asoc_simple_card_sub_parse_of(np,
148                                                   &info->cpu_dai,
149                                                   of_cpu);
150         if (ret < 0)
151                 return ret;
152 
153         /* CODEC sub-node */
154         ret = -EINVAL;
155         np = of_get_child_by_name(node, "simple-audio-card,codec");
156         if (np)
157                 ret = asoc_simple_card_sub_parse_of(np,
158                                                   &info->codec_dai,
159                                                   of_codec);
160         if (ret < 0)
161                 return ret;
162 
163         if (!info->cpu_dai.name || !info->codec_dai.name)
164                 return -EINVAL;
165 
166         /* card name is created from CPU/CODEC dai name */
167         name = devm_kzalloc(dev,
168                             strlen(info->cpu_dai.name)   +
169                             strlen(info->codec_dai.name) + 2,
170                             GFP_KERNEL);
171         sprintf(name, "%s-%s", info->cpu_dai.name, info->codec_dai.name);
172         info->name = info->card = name;
173 
174         /* simple-card assumes platform == cpu */
175         *of_platform = *of_cpu;
176 
177         dev_dbg(dev, "card-name : %s\n", info->card);
178         dev_dbg(dev, "platform : %04x\n", info->daifmt);
179         dev_dbg(dev, "cpu : %s / %04x / %d\n",
180                 info->cpu_dai.name,
181                 info->cpu_dai.fmt,
182                 info->cpu_dai.sysclk);
183         dev_dbg(dev, "codec : %s / %04x / %d\n",
184                 info->codec_dai.name,
185                 info->codec_dai.fmt,
186                 info->codec_dai.sysclk);
187 
188         return 0;
189 }
190 
191 static int asoc_simple_card_probe(struct platform_device *pdev)
192 {
193         struct asoc_simple_card_info *cinfo;
194         struct device_node *np = pdev->dev.of_node;
195         struct device_node *of_cpu, *of_codec, *of_platform;
196         struct device *dev = &pdev->dev;
197         int ret;
198 
199         cinfo           = NULL;
200         of_cpu          = NULL;
201         of_codec        = NULL;
202         of_platform     = NULL;
203 
204         cinfo = devm_kzalloc(dev, sizeof(*cinfo), GFP_KERNEL);
205         if (!cinfo)
206                 return -ENOMEM;
207 
208         if (np && of_device_is_available(np)) {
209                 cinfo->snd_card.dev = dev;
210 
211                 ret = asoc_simple_card_parse_of(np, cinfo, dev,
212                                                 &of_cpu,
213                                                 &of_codec,
214                                                 &of_platform);
215                 if (ret < 0) {
216                         if (ret != -EPROBE_DEFER)
217                                 dev_err(dev, "parse error %d\n", ret);
218                         return ret;
219                 }
220         } else {
221                 if (!dev->platform_data) {
222                         dev_err(dev, "no info for asoc-simple-card\n");
223                         return -EINVAL;
224                 }
225 
226                 memcpy(cinfo, dev->platform_data, sizeof(*cinfo));
227                 cinfo->snd_card.dev = dev;
228         }
229 
230         if (!cinfo->name        ||
231             !cinfo->card        ||
232             !cinfo->codec_dai.name      ||
233             !(cinfo->codec              || of_codec)    ||
234             !(cinfo->platform           || of_platform) ||
235             !(cinfo->cpu_dai.name       || of_cpu)) {
236                 dev_err(dev, "insufficient asoc_simple_card_info settings\n");
237                 return -EINVAL;
238         }
239 
240         /*
241          * init snd_soc_dai_link
242          */
243         cinfo->snd_link.name            = cinfo->name;
244         cinfo->snd_link.stream_name     = cinfo->name;
245         cinfo->snd_link.cpu_dai_name    = cinfo->cpu_dai.name;
246         cinfo->snd_link.platform_name   = cinfo->platform;
247         cinfo->snd_link.codec_name      = cinfo->codec;
248         cinfo->snd_link.codec_dai_name  = cinfo->codec_dai.name;
249         cinfo->snd_link.cpu_of_node     = of_cpu;
250         cinfo->snd_link.codec_of_node   = of_codec;
251         cinfo->snd_link.platform_of_node = of_platform;
252         cinfo->snd_link.init            = asoc_simple_card_dai_init;
253 
254         /*
255          * init snd_soc_card
256          */
257         cinfo->snd_card.name            = cinfo->card;
258         cinfo->snd_card.owner           = THIS_MODULE;
259         cinfo->snd_card.dai_link        = &cinfo->snd_link;
260         cinfo->snd_card.num_links       = 1;
261 
262         snd_soc_card_set_drvdata(&cinfo->snd_card, cinfo);
263 
264         return devm_snd_soc_register_card(&pdev->dev, &cinfo->snd_card);
265 }
266 
267 static const struct of_device_id asoc_simple_of_match[] = {
268         { .compatible = "simple-audio-card", },
269         {},
270 };
271 MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
272 
273 static struct platform_driver asoc_simple_card = {
274         .driver = {
275                 .name   = "asoc-simple-card",
276                 .owner = THIS_MODULE,
277                 .of_match_table = asoc_simple_of_match,
278         },
279         .probe          = asoc_simple_card_probe,
280 };
281 
282 module_platform_driver(asoc_simple_card);
283 
284 MODULE_ALIAS("platform:asoc-simple-card");
285 MODULE_LICENSE("GPL");
286 MODULE_DESCRIPTION("ASoC Simple Sound Card");
287 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
288 

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