xref: /openbmc/linux/sound/soc/codecs/hdmi-codec.c (revision 0edbfea5)
1 /*
2  * ALSA SoC codec for HDMI encoder drivers
3  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
4  * Author: Jyri Sarha <jsarha@ti.com>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * version 2 as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
13  * General Public License for more details.
14  */
15 #include <linux/module.h>
16 #include <linux/string.h>
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21 #include <sound/pcm_drm_eld.h>
22 #include <sound/hdmi-codec.h>
23 #include <sound/pcm_iec958.h>
24 
25 #include <drm/drm_crtc.h> /* This is only to get MAX_ELD_BYTES */
26 
27 struct hdmi_codec_priv {
28 	struct hdmi_codec_pdata hcd;
29 	struct snd_soc_dai_driver *daidrv;
30 	struct hdmi_codec_daifmt daifmt[2];
31 	struct mutex current_stream_lock;
32 	struct snd_pcm_substream *current_stream;
33 	struct snd_pcm_hw_constraint_list ratec;
34 	uint8_t eld[MAX_ELD_BYTES];
35 };
36 
37 static const struct snd_soc_dapm_widget hdmi_widgets[] = {
38 	SND_SOC_DAPM_OUTPUT("TX"),
39 };
40 
41 static const struct snd_soc_dapm_route hdmi_routes[] = {
42 	{ "TX", NULL, "Playback" },
43 };
44 
45 enum {
46 	DAI_ID_I2S = 0,
47 	DAI_ID_SPDIF,
48 };
49 
50 static int hdmi_eld_ctl_info(struct snd_kcontrol *kcontrol,
51 			     struct snd_ctl_elem_info *uinfo)
52 {
53 	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
54 	struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
55 
56 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
57 	uinfo->count = sizeof(hcp->eld);
58 
59 	return 0;
60 }
61 
62 static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
63 			    struct snd_ctl_elem_value *ucontrol)
64 {
65 	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
66 	struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
67 
68 	memcpy(ucontrol->value.bytes.data, hcp->eld, sizeof(hcp->eld));
69 
70 	return 0;
71 }
72 
73 static const struct snd_kcontrol_new hdmi_controls[] = {
74 	{
75 		.access = SNDRV_CTL_ELEM_ACCESS_READ |
76 			  SNDRV_CTL_ELEM_ACCESS_VOLATILE,
77 		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
78 		.name = "ELD",
79 		.info = hdmi_eld_ctl_info,
80 		.get = hdmi_eld_ctl_get,
81 	},
82 };
83 
84 static int hdmi_codec_new_stream(struct snd_pcm_substream *substream,
85 				 struct snd_soc_dai *dai)
86 {
87 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
88 	int ret = 0;
89 
90 	mutex_lock(&hcp->current_stream_lock);
91 	if (!hcp->current_stream) {
92 		hcp->current_stream = substream;
93 	} else if (hcp->current_stream != substream) {
94 		dev_err(dai->dev, "Only one simultaneous stream supported!\n");
95 		ret = -EINVAL;
96 	}
97 	mutex_unlock(&hcp->current_stream_lock);
98 
99 	return ret;
100 }
101 
102 static int hdmi_codec_startup(struct snd_pcm_substream *substream,
103 			      struct snd_soc_dai *dai)
104 {
105 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
106 	int ret = 0;
107 
108 	dev_dbg(dai->dev, "%s()\n", __func__);
109 
110 	ret = hdmi_codec_new_stream(substream, dai);
111 	if (ret)
112 		return ret;
113 
114 	if (hcp->hcd.ops->audio_startup) {
115 		ret = hcp->hcd.ops->audio_startup(dai->dev->parent);
116 		if (ret) {
117 			mutex_lock(&hcp->current_stream_lock);
118 			hcp->current_stream = NULL;
119 			mutex_unlock(&hcp->current_stream_lock);
120 			return ret;
121 		}
122 	}
123 
124 	if (hcp->hcd.ops->get_eld) {
125 		ret = hcp->hcd.ops->get_eld(dai->dev->parent, hcp->eld,
126 					    sizeof(hcp->eld));
127 
128 		if (!ret) {
129 			ret = snd_pcm_hw_constraint_eld(substream->runtime,
130 							hcp->eld);
131 			if (ret)
132 				return ret;
133 		}
134 	}
135 	return 0;
136 }
137 
138 static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
139 				struct snd_soc_dai *dai)
140 {
141 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
142 
143 	dev_dbg(dai->dev, "%s()\n", __func__);
144 
145 	WARN_ON(hcp->current_stream != substream);
146 
147 	hcp->hcd.ops->audio_shutdown(dai->dev->parent);
148 
149 	mutex_lock(&hcp->current_stream_lock);
150 	hcp->current_stream = NULL;
151 	mutex_unlock(&hcp->current_stream_lock);
152 }
153 
154 static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
155 				struct snd_pcm_hw_params *params,
156 				struct snd_soc_dai *dai)
157 {
158 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
159 	struct hdmi_codec_params hp = {
160 		.iec = {
161 			.status = { 0 },
162 			.subcode = { 0 },
163 			.pad = 0,
164 			.dig_subframe = { 0 },
165 		}
166 	};
167 	int ret;
168 
169 	dev_dbg(dai->dev, "%s() width %d rate %d channels %d\n", __func__,
170 		params_width(params), params_rate(params),
171 		params_channels(params));
172 
173 	if (params_width(params) > 24)
174 		params->msbits = 24;
175 
176 	ret = snd_pcm_create_iec958_consumer_hw_params(params, hp.iec.status,
177 						       sizeof(hp.iec.status));
178 	if (ret < 0) {
179 		dev_err(dai->dev, "Creating IEC958 channel status failed %d\n",
180 			ret);
181 		return ret;
182 	}
183 
184 	ret = hdmi_codec_new_stream(substream, dai);
185 	if (ret)
186 		return ret;
187 
188 	hdmi_audio_infoframe_init(&hp.cea);
189 	hp.cea.channels = params_channels(params);
190 	hp.cea.coding_type = HDMI_AUDIO_CODING_TYPE_STREAM;
191 	hp.cea.sample_size = HDMI_AUDIO_SAMPLE_SIZE_STREAM;
192 	hp.cea.sample_frequency = HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM;
193 
194 	hp.sample_width = params_width(params);
195 	hp.sample_rate = params_rate(params);
196 	hp.channels = params_channels(params);
197 
198 	return hcp->hcd.ops->hw_params(dai->dev->parent, &hcp->daifmt[dai->id],
199 				       &hp);
200 }
201 
202 static int hdmi_codec_set_fmt(struct snd_soc_dai *dai,
203 			      unsigned int fmt)
204 {
205 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
206 	struct hdmi_codec_daifmt cf = { 0 };
207 	int ret = 0;
208 
209 	dev_dbg(dai->dev, "%s()\n", __func__);
210 
211 	if (dai->id == DAI_ID_SPDIF) {
212 		cf.fmt = HDMI_SPDIF;
213 	} else {
214 		switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
215 		case SND_SOC_DAIFMT_CBM_CFM:
216 			cf.bit_clk_master = 1;
217 			cf.frame_clk_master = 1;
218 			break;
219 		case SND_SOC_DAIFMT_CBS_CFM:
220 			cf.frame_clk_master = 1;
221 			break;
222 		case SND_SOC_DAIFMT_CBM_CFS:
223 			cf.bit_clk_master = 1;
224 			break;
225 		case SND_SOC_DAIFMT_CBS_CFS:
226 			break;
227 		default:
228 			return -EINVAL;
229 		}
230 
231 		switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
232 		case SND_SOC_DAIFMT_NB_NF:
233 			break;
234 		case SND_SOC_DAIFMT_NB_IF:
235 			cf.frame_clk_inv = 1;
236 			break;
237 		case SND_SOC_DAIFMT_IB_NF:
238 			cf.bit_clk_inv = 1;
239 			break;
240 		case SND_SOC_DAIFMT_IB_IF:
241 			cf.frame_clk_inv = 1;
242 			cf.bit_clk_inv = 1;
243 			break;
244 		}
245 
246 		switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
247 		case SND_SOC_DAIFMT_I2S:
248 			cf.fmt = HDMI_I2S;
249 			break;
250 		case SND_SOC_DAIFMT_DSP_A:
251 			cf.fmt = HDMI_DSP_A;
252 			break;
253 		case SND_SOC_DAIFMT_DSP_B:
254 			cf.fmt = HDMI_DSP_B;
255 			break;
256 		case SND_SOC_DAIFMT_RIGHT_J:
257 			cf.fmt = HDMI_RIGHT_J;
258 			break;
259 		case SND_SOC_DAIFMT_LEFT_J:
260 			cf.fmt = HDMI_LEFT_J;
261 			break;
262 		case SND_SOC_DAIFMT_AC97:
263 			cf.fmt = HDMI_AC97;
264 			break;
265 		default:
266 			dev_err(dai->dev, "Invalid DAI interface format\n");
267 			return -EINVAL;
268 		}
269 	}
270 
271 	hcp->daifmt[dai->id] = cf;
272 
273 	return ret;
274 }
275 
276 static int hdmi_codec_digital_mute(struct snd_soc_dai *dai, int mute)
277 {
278 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
279 
280 	dev_dbg(dai->dev, "%s()\n", __func__);
281 
282 	if (hcp->hcd.ops->digital_mute)
283 		return hcp->hcd.ops->digital_mute(dai->dev->parent, mute);
284 
285 	return 0;
286 }
287 
288 static const struct snd_soc_dai_ops hdmi_dai_ops = {
289 	.startup	= hdmi_codec_startup,
290 	.shutdown	= hdmi_codec_shutdown,
291 	.hw_params	= hdmi_codec_hw_params,
292 	.set_fmt	= hdmi_codec_set_fmt,
293 	.digital_mute	= hdmi_codec_digital_mute,
294 };
295 
296 
297 #define HDMI_RATES	(SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
298 			 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
299 			 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |\
300 			 SNDRV_PCM_RATE_192000)
301 
302 #define SPDIF_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
303 			 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
304 			 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
305 			 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE)
306 
307 /*
308  * This list is only for formats allowed on the I2S bus. So there is
309  * some formats listed that are not supported by HDMI interface. For
310  * instance allowing the 32-bit formats enables 24-precision with CPU
311  * DAIs that do not support 24-bit formats. If the extra formats cause
312  * problems, we should add the video side driver an option to disable
313  * them.
314  */
315 #define I2S_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
316 			 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
317 			 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
318 			 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |\
319 			 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE)
320 
321 static struct snd_soc_dai_driver hdmi_i2s_dai = {
322 	.name = "i2s-hifi",
323 	.id = DAI_ID_I2S,
324 	.playback = {
325 		.stream_name = "Playback",
326 		.channels_min = 2,
327 		.channels_max = 8,
328 		.rates = HDMI_RATES,
329 		.formats = I2S_FORMATS,
330 		.sig_bits = 24,
331 	},
332 	.ops = &hdmi_dai_ops,
333 };
334 
335 static const struct snd_soc_dai_driver hdmi_spdif_dai = {
336 	.name = "spdif-hifi",
337 	.id = DAI_ID_SPDIF,
338 	.playback = {
339 		.stream_name = "Playback",
340 		.channels_min = 2,
341 		.channels_max = 2,
342 		.rates = HDMI_RATES,
343 		.formats = SPDIF_FORMATS,
344 	},
345 	.ops = &hdmi_dai_ops,
346 };
347 
348 static struct snd_soc_codec_driver hdmi_codec = {
349 	.controls = hdmi_controls,
350 	.num_controls = ARRAY_SIZE(hdmi_controls),
351 	.dapm_widgets = hdmi_widgets,
352 	.num_dapm_widgets = ARRAY_SIZE(hdmi_widgets),
353 	.dapm_routes = hdmi_routes,
354 	.num_dapm_routes = ARRAY_SIZE(hdmi_routes),
355 };
356 
357 static int hdmi_codec_probe(struct platform_device *pdev)
358 {
359 	struct hdmi_codec_pdata *hcd = pdev->dev.platform_data;
360 	struct device *dev = &pdev->dev;
361 	struct hdmi_codec_priv *hcp;
362 	int dai_count, i = 0;
363 	int ret;
364 
365 	dev_dbg(dev, "%s()\n", __func__);
366 
367 	if (!hcd) {
368 		dev_err(dev, "%s: No plalform data\n", __func__);
369 		return -EINVAL;
370 	}
371 
372 	dai_count = hcd->i2s + hcd->spdif;
373 	if (dai_count < 1 || !hcd->ops || !hcd->ops->hw_params ||
374 	    !hcd->ops->audio_shutdown) {
375 		dev_err(dev, "%s: Invalid parameters\n", __func__);
376 		return -EINVAL;
377 	}
378 
379 	hcp = devm_kzalloc(dev, sizeof(*hcp), GFP_KERNEL);
380 	if (!hcp)
381 		return -ENOMEM;
382 
383 	hcp->hcd = *hcd;
384 	mutex_init(&hcp->current_stream_lock);
385 
386 	hcp->daidrv = devm_kzalloc(dev, dai_count * sizeof(*hcp->daidrv),
387 				   GFP_KERNEL);
388 	if (!hcp->daidrv)
389 		return -ENOMEM;
390 
391 	if (hcd->i2s) {
392 		hcp->daidrv[i] = hdmi_i2s_dai;
393 		hcp->daidrv[i].playback.channels_max =
394 			hcd->max_i2s_channels;
395 		i++;
396 	}
397 
398 	if (hcd->spdif)
399 		hcp->daidrv[i] = hdmi_spdif_dai;
400 
401 	ret = snd_soc_register_codec(dev, &hdmi_codec, hcp->daidrv,
402 				     dai_count);
403 	if (ret) {
404 		dev_err(dev, "%s: snd_soc_register_codec() failed (%d)\n",
405 			__func__, ret);
406 		return ret;
407 	}
408 
409 	dev_set_drvdata(dev, hcp);
410 	return 0;
411 }
412 
413 static int hdmi_codec_remove(struct platform_device *pdev)
414 {
415 	snd_soc_unregister_codec(&pdev->dev);
416 	return 0;
417 }
418 
419 static struct platform_driver hdmi_codec_driver = {
420 	.driver = {
421 		.name = HDMI_CODEC_DRV_NAME,
422 	},
423 	.probe = hdmi_codec_probe,
424 	.remove = hdmi_codec_remove,
425 };
426 
427 module_platform_driver(hdmi_codec_driver);
428 
429 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
430 MODULE_DESCRIPTION("HDMI Audio Codec Driver");
431 MODULE_LICENSE("GPL");
432 MODULE_ALIAS("platform:" HDMI_CODEC_DRV_NAME);
433