1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // ASoC audio graph sound card support 4 // 5 // Copyright (C) 2016 Renesas Solutions Corp. 6 // Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 7 // 8 // based on ${LINUX}/sound/soc/generic/simple-card.c 9 10 #include <linux/clk.h> 11 #include <linux/device.h> 12 #include <linux/gpio.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/of_device.h> 17 #include <linux/of_gpio.h> 18 #include <linux/of_graph.h> 19 #include <linux/platform_device.h> 20 #include <linux/string.h> 21 #include <sound/simple_card_utils.h> 22 23 struct graph_card_data { 24 struct snd_soc_card snd_card; 25 struct graph_dai_props { 26 struct asoc_simple_dai cpu_dai; 27 struct asoc_simple_dai codec_dai; 28 unsigned int mclk_fs; 29 } *dai_props; 30 unsigned int mclk_fs; 31 struct asoc_simple_jack hp_jack; 32 struct asoc_simple_jack mic_jack; 33 struct snd_soc_dai_link *dai_link; 34 struct gpio_desc *pa_gpio; 35 }; 36 37 static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w, 38 struct snd_kcontrol *kcontrol, 39 int event) 40 { 41 struct snd_soc_dapm_context *dapm = w->dapm; 42 struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card); 43 44 switch (event) { 45 case SND_SOC_DAPM_POST_PMU: 46 gpiod_set_value_cansleep(priv->pa_gpio, 1); 47 break; 48 case SND_SOC_DAPM_PRE_PMD: 49 gpiod_set_value_cansleep(priv->pa_gpio, 0); 50 break; 51 default: 52 return -EINVAL; 53 } 54 55 return 0; 56 } 57 58 static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = { 59 SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM, 60 0, 0, NULL, 0, asoc_graph_card_outdrv_event, 61 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD), 62 }; 63 64 #define graph_priv_to_card(priv) (&(priv)->snd_card) 65 #define graph_priv_to_props(priv, i) ((priv)->dai_props + (i)) 66 #define graph_priv_to_dev(priv) (graph_priv_to_card(priv)->dev) 67 #define graph_priv_to_link(priv, i) (graph_priv_to_card(priv)->dai_link + (i)) 68 69 static int asoc_graph_card_startup(struct snd_pcm_substream *substream) 70 { 71 struct snd_soc_pcm_runtime *rtd = substream->private_data; 72 struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card); 73 struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num); 74 int ret; 75 76 ret = asoc_simple_card_clk_enable(&dai_props->cpu_dai); 77 if (ret) 78 return ret; 79 80 ret = asoc_simple_card_clk_enable(&dai_props->codec_dai); 81 if (ret) 82 asoc_simple_card_clk_disable(&dai_props->cpu_dai); 83 84 return ret; 85 } 86 87 static void asoc_graph_card_shutdown(struct snd_pcm_substream *substream) 88 { 89 struct snd_soc_pcm_runtime *rtd = substream->private_data; 90 struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card); 91 struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num); 92 93 asoc_simple_card_clk_disable(&dai_props->cpu_dai); 94 95 asoc_simple_card_clk_disable(&dai_props->codec_dai); 96 } 97 98 static int asoc_graph_card_hw_params(struct snd_pcm_substream *substream, 99 struct snd_pcm_hw_params *params) 100 { 101 struct snd_soc_pcm_runtime *rtd = substream->private_data; 102 struct snd_soc_dai *codec_dai = rtd->codec_dai; 103 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 104 struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card); 105 struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num); 106 unsigned int mclk, mclk_fs = 0; 107 int ret = 0; 108 109 if (priv->mclk_fs) 110 mclk_fs = priv->mclk_fs; 111 else if (dai_props->mclk_fs) 112 mclk_fs = dai_props->mclk_fs; 113 114 if (mclk_fs) { 115 mclk = params_rate(params) * mclk_fs; 116 ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk, 117 SND_SOC_CLOCK_IN); 118 if (ret && ret != -ENOTSUPP) 119 goto err; 120 121 ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk, 122 SND_SOC_CLOCK_OUT); 123 if (ret && ret != -ENOTSUPP) 124 goto err; 125 } 126 return 0; 127 err: 128 return ret; 129 } 130 131 static const struct snd_soc_ops asoc_graph_card_ops = { 132 .startup = asoc_graph_card_startup, 133 .shutdown = asoc_graph_card_shutdown, 134 .hw_params = asoc_graph_card_hw_params, 135 }; 136 137 static int asoc_graph_card_dai_init(struct snd_soc_pcm_runtime *rtd) 138 { 139 struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card); 140 struct snd_soc_dai *codec = rtd->codec_dai; 141 struct snd_soc_dai *cpu = rtd->cpu_dai; 142 struct graph_dai_props *dai_props = 143 graph_priv_to_props(priv, rtd->num); 144 int ret; 145 146 ret = asoc_simple_card_init_dai(codec, &dai_props->codec_dai); 147 if (ret < 0) 148 return ret; 149 150 ret = asoc_simple_card_init_dai(cpu, &dai_props->cpu_dai); 151 if (ret < 0) 152 return ret; 153 154 return 0; 155 } 156 157 static int asoc_graph_card_dai_link_of(struct device_node *cpu_port, 158 struct graph_card_data *priv, 159 int idx) 160 { 161 struct device *dev = graph_priv_to_dev(priv); 162 struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx); 163 struct graph_dai_props *dai_props = graph_priv_to_props(priv, idx); 164 struct asoc_simple_dai *cpu_dai = &dai_props->cpu_dai; 165 struct asoc_simple_dai *codec_dai = &dai_props->codec_dai; 166 struct device_node *cpu_ep = of_get_next_child(cpu_port, NULL); 167 struct device_node *codec_ep = of_graph_get_remote_endpoint(cpu_ep); 168 struct device_node *rcpu_ep = of_graph_get_remote_endpoint(codec_ep); 169 int ret; 170 171 if (rcpu_ep != cpu_ep) { 172 dev_err(dev, "remote-endpoint mismatch (%s/%s/%s)\n", 173 cpu_ep->name, codec_ep->name, rcpu_ep->name); 174 ret = -EINVAL; 175 goto dai_link_of_err; 176 } 177 178 ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep, 179 NULL, &dai_link->dai_fmt); 180 if (ret < 0) 181 goto dai_link_of_err; 182 183 of_property_read_u32(rcpu_ep, "mclk-fs", &dai_props->mclk_fs); 184 185 ret = asoc_simple_card_parse_graph_cpu(cpu_ep, dai_link); 186 if (ret < 0) 187 goto dai_link_of_err; 188 189 ret = asoc_simple_card_parse_graph_codec(codec_ep, dai_link); 190 if (ret < 0) 191 goto dai_link_of_err; 192 193 ret = asoc_simple_card_of_parse_tdm(cpu_ep, cpu_dai); 194 if (ret < 0) 195 goto dai_link_of_err; 196 197 ret = asoc_simple_card_of_parse_tdm(codec_ep, codec_dai); 198 if (ret < 0) 199 goto dai_link_of_err; 200 201 ret = asoc_simple_card_parse_clk_cpu(dev, cpu_ep, dai_link, cpu_dai); 202 if (ret < 0) 203 goto dai_link_of_err; 204 205 ret = asoc_simple_card_parse_clk_codec(dev, codec_ep, dai_link, codec_dai); 206 if (ret < 0) 207 goto dai_link_of_err; 208 209 ret = asoc_simple_card_canonicalize_dailink(dai_link); 210 if (ret < 0) 211 goto dai_link_of_err; 212 213 ret = asoc_simple_card_set_dailink_name(dev, dai_link, 214 "%s-%s", 215 dai_link->cpu_dai_name, 216 dai_link->codec_dai_name); 217 if (ret < 0) 218 goto dai_link_of_err; 219 220 dai_link->ops = &asoc_graph_card_ops; 221 dai_link->init = asoc_graph_card_dai_init; 222 223 asoc_simple_card_canonicalize_cpu(dai_link, 224 of_graph_get_endpoint_count(dai_link->cpu_of_node) == 1); 225 226 dai_link_of_err: 227 of_node_put(cpu_ep); 228 of_node_put(rcpu_ep); 229 of_node_put(codec_ep); 230 231 return ret; 232 } 233 234 static int asoc_graph_card_parse_of(struct graph_card_data *priv) 235 { 236 struct of_phandle_iterator it; 237 struct device *dev = graph_priv_to_dev(priv); 238 struct snd_soc_card *card = graph_priv_to_card(priv); 239 struct device_node *node = dev->of_node; 240 int rc, idx = 0; 241 int ret; 242 243 ret = asoc_simple_card_of_parse_widgets(card, NULL); 244 if (ret < 0) 245 return ret; 246 247 ret = asoc_simple_card_of_parse_routing(card, NULL, 1); 248 if (ret < 0) 249 return ret; 250 251 /* Factor to mclk, used in hw_params() */ 252 of_property_read_u32(node, "mclk-fs", &priv->mclk_fs); 253 254 of_for_each_phandle(&it, rc, node, "dais", NULL, 0) { 255 ret = asoc_graph_card_dai_link_of(it.node, priv, idx++); 256 if (ret < 0) { 257 of_node_put(it.node); 258 259 return ret; 260 } 261 } 262 263 return asoc_simple_card_parse_card_name(card, NULL); 264 } 265 266 static int asoc_graph_get_dais_count(struct device *dev) 267 { 268 struct of_phandle_iterator it; 269 struct device_node *node = dev->of_node; 270 int count = 0; 271 int rc; 272 273 of_for_each_phandle(&it, rc, node, "dais", NULL, 0) 274 count++; 275 276 return count; 277 } 278 279 static int asoc_graph_soc_card_probe(struct snd_soc_card *card) 280 { 281 struct graph_card_data *priv = snd_soc_card_get_drvdata(card); 282 int ret; 283 284 ret = asoc_simple_card_init_hp(card, &priv->hp_jack, NULL); 285 if (ret < 0) 286 return ret; 287 288 ret = asoc_simple_card_init_mic(card, &priv->mic_jack, NULL); 289 if (ret < 0) 290 return ret; 291 292 return 0; 293 } 294 295 static int asoc_graph_card_probe(struct platform_device *pdev) 296 { 297 struct graph_card_data *priv; 298 struct snd_soc_dai_link *dai_link; 299 struct graph_dai_props *dai_props; 300 struct device *dev = &pdev->dev; 301 struct snd_soc_card *card; 302 int num, ret; 303 304 /* Allocate the private data and the DAI link array */ 305 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 306 if (!priv) 307 return -ENOMEM; 308 309 num = asoc_graph_get_dais_count(dev); 310 if (num == 0) 311 return -EINVAL; 312 313 dai_props = devm_kcalloc(dev, num, sizeof(*dai_props), GFP_KERNEL); 314 dai_link = devm_kcalloc(dev, num, sizeof(*dai_link), GFP_KERNEL); 315 if (!dai_props || !dai_link) 316 return -ENOMEM; 317 318 priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW); 319 if (IS_ERR(priv->pa_gpio)) { 320 ret = PTR_ERR(priv->pa_gpio); 321 dev_err(dev, "failed to get amplifier gpio: %d\n", ret); 322 return ret; 323 } 324 325 priv->dai_props = dai_props; 326 priv->dai_link = dai_link; 327 328 /* Init snd_soc_card */ 329 card = graph_priv_to_card(priv); 330 card->owner = THIS_MODULE; 331 card->dev = dev; 332 card->dai_link = dai_link; 333 card->num_links = num; 334 card->dapm_widgets = asoc_graph_card_dapm_widgets; 335 card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets); 336 card->probe = asoc_graph_soc_card_probe; 337 338 ret = asoc_graph_card_parse_of(priv); 339 if (ret < 0) { 340 if (ret != -EPROBE_DEFER) 341 dev_err(dev, "parse error %d\n", ret); 342 goto err; 343 } 344 345 snd_soc_card_set_drvdata(card, priv); 346 347 ret = devm_snd_soc_register_card(dev, card); 348 if (ret < 0) 349 goto err; 350 351 return 0; 352 err: 353 asoc_simple_card_clean_reference(card); 354 355 return ret; 356 } 357 358 static int asoc_graph_card_remove(struct platform_device *pdev) 359 { 360 struct snd_soc_card *card = platform_get_drvdata(pdev); 361 362 return asoc_simple_card_clean_reference(card); 363 } 364 365 static const struct of_device_id asoc_graph_of_match[] = { 366 { .compatible = "audio-graph-card", }, 367 {}, 368 }; 369 MODULE_DEVICE_TABLE(of, asoc_graph_of_match); 370 371 static struct platform_driver asoc_graph_card = { 372 .driver = { 373 .name = "asoc-audio-graph-card", 374 .pm = &snd_soc_pm_ops, 375 .of_match_table = asoc_graph_of_match, 376 }, 377 .probe = asoc_graph_card_probe, 378 .remove = asoc_graph_card_remove, 379 }; 380 module_platform_driver(asoc_graph_card); 381 382 MODULE_ALIAS("platform:asoc-audio-graph-card"); 383 MODULE_LICENSE("GPL v2"); 384 MODULE_DESCRIPTION("ASoC Audio Graph Sound Card"); 385 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); 386