q6usb.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2022-2025 Qualcomm Innovation Center, Inc. All rights reserved.
  4 */
  5
  6#include <linux/auxiliary_bus.h>
  7#include <linux/device.h>
  8#include <linux/dma-mapping.h>
  9#include <linux/dma-map-ops.h>
 10#include <linux/err.h>
 11#include <linux/init.h>
 12#include <linux/iommu.h>
 13#include <linux/module.h>
 14#include <linux/platform_device.h>
 15#include <linux/slab.h>
 16
 17#include <sound/asound.h>
 18#include <sound/jack.h>
 19#include <sound/pcm.h>
 20#include <sound/pcm_params.h>
 21#include <sound/q6usboffload.h>
 22#include <sound/soc.h>
 23#include <sound/soc-usb.h>
 24
 25#include <dt-bindings/sound/qcom,q6afe.h>
 26
 27#include "q6afe.h"
 28#include "q6dsp-lpass-ports.h"
 29
 30#define Q6_USB_SID_MASK	0xF
 31
 32struct q6usb_port_data {
 33	struct auxiliary_device uauxdev;
 34	struct q6afe_usb_cfg usb_cfg;
 35	struct snd_soc_usb *usb;
 36	struct snd_soc_jack *hs_jack;
 37	struct q6usb_offload priv;
 38
 39	/* Protects against operations between SOC USB and ASoC */
 40	struct mutex mutex;
 41	struct list_head devices;
 42};
 43
 44static const struct snd_soc_dapm_widget q6usb_dai_widgets[] = {
 45	SND_SOC_DAPM_HP("USB_RX_BE", NULL),
 46};
 47
 48static const struct snd_soc_dapm_route q6usb_dapm_routes[] = {
 49	{"USB Playback", NULL, "USB_RX_BE"},
 50};
 51
 52static int q6usb_hw_params(struct snd_pcm_substream *substream,
 53			   struct snd_pcm_hw_params *params,
 54			   struct snd_soc_dai *dai)
 55{
 56	struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
 57	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 58	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 59	int direction = substream->stream;
 60	struct q6afe_port *q6usb_afe;
 61	struct snd_soc_usb_device *sdev;
 62	int ret = -EINVAL;
 63
 64	mutex_lock(&data->mutex);
 65
 66	/* No active chip index */
 67	if (list_empty(&data->devices))
 68		goto out;
 69
 70	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
 71
 72	ret = snd_soc_usb_find_supported_format(sdev->chip_idx, params, direction);
 73	if (ret < 0)
 74		goto out;
 75
 76	q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
 77	if (IS_ERR(q6usb_afe)) {
 78		ret = PTR_ERR(q6usb_afe);
 79		goto out;
 80	}
 81
 82	/* Notify audio DSP about the devices being offloaded */
 83	ret = afe_port_send_usb_dev_param(q6usb_afe, sdev->card_idx,
 84					  sdev->ppcm_idx[sdev->num_playback - 1]);
 85
 86out:
 87	mutex_unlock(&data->mutex);
 88
 89	return ret;
 90}
 91
 92static const struct snd_soc_dai_ops q6usb_ops = {
 93	.hw_params = q6usb_hw_params,
 94};
 95
 96static struct snd_soc_dai_driver q6usb_be_dais[] = {
 97	{
 98		.playback = {
 99			.stream_name = "USB BE RX",
100			.rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
101				SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |
102				SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
103				SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |
104				SNDRV_PCM_RATE_192000,
105			.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
106				SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |
107				SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |
108				SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE,
109			.channels_min = 1,
110			.channels_max = 2,
111			.rate_max =     192000,
112			.rate_min =	8000,
113		},
114		.id = USB_RX,
115		.name = "USB_RX_BE",
116		.ops = &q6usb_ops,
117	},
118};
119
120static int q6usb_audio_ports_of_xlate_dai_name(struct snd_soc_component *component,
121					       const struct of_phandle_args *args,
122					       const char **dai_name)
123{
124	int id = args->args[0];
125	int ret = -EINVAL;
126	int i;
127
128	for (i = 0; i < ARRAY_SIZE(q6usb_be_dais); i++) {
129		if (q6usb_be_dais[i].id == id) {
130			*dai_name = q6usb_be_dais[i].name;
131			ret = 0;
132			break;
133		}
134	}
135
136	return ret;
137}
138
139static int q6usb_get_pcm_id_from_widget(struct snd_soc_dapm_widget *w)
140{
141	struct snd_soc_card *card = snd_soc_dapm_to_card(w->dapm);
142	struct snd_soc_pcm_runtime *rtd;
143	struct snd_soc_dai *dai;
144
145	for_each_card_rtds(card, rtd) {
146		dai = snd_soc_rtd_to_cpu(rtd, 0);
147		/*
148		 * Only look for playback widget. RTD number carries the assigned
149		 * PCM index.
150		 */
151		if (dai->stream[0].widget == w)
152			return rtd->id;
153	}
154
155	return -1;
156}
157
158static int q6usb_usb_mixer_enabled(struct snd_soc_dapm_widget *w)
159{
160	struct snd_soc_dapm_path *p;
161
162	/* Checks to ensure USB path is enabled/connected */
163	snd_soc_dapm_widget_for_each_sink_path(w, p)
164		if (!strcmp(p->sink->name, "USB Mixer") && p->connect)
165			return 1;
166
167	return 0;
168}
169
170static int q6usb_get_pcm_id(struct snd_soc_component *component)
171{
172	struct snd_soc_dapm_widget *w;
173	struct snd_soc_dapm_path *p;
174	int pidx;
175
176	/*
177	 * Traverse widgets to find corresponding FE widget.  The DAI links are
178	 * built like the following:
179	 *    MultiMedia* <-> MM_DL* <-> USB Mixer*
180	 */
181	for_each_card_widgets(component->card, w) {
182		if (!strncmp(w->name, "MultiMedia", 10)) {
183			/*
184			 * Look up all paths associated with the FE widget to see if
185			 * the USB BE is enabled.  The sink widget is responsible to
186			 * link with the USB mixers.
187			 */
188			snd_soc_dapm_widget_for_each_sink_path(w, p) {
189				if (q6usb_usb_mixer_enabled(p->sink)) {
190					pidx = q6usb_get_pcm_id_from_widget(w);
191					return pidx;
192				}
193			}
194		}
195	}
196
197	return -1;
198}
199
200static int q6usb_update_offload_route(struct snd_soc_component *component, int card,
201				      int pcm, int direction, enum snd_soc_usb_kctl path,
202				      long *route)
203{
204	struct q6usb_port_data *data = dev_get_drvdata(component->dev);
205	struct snd_soc_usb_device *sdev;
206	int ret = 0;
207	int idx = -1;
208
209	mutex_lock(&data->mutex);
210
211	if (list_empty(&data->devices) ||
212	    direction == SNDRV_PCM_STREAM_CAPTURE) {
213		ret = -ENODEV;
214		goto out;
215	}
216
217	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
218
219	/*
220	 * Will always look for last PCM device discovered/probed as the
221	 * active offload index.
222	 */
223	if (card == sdev->card_idx &&
224	    pcm == sdev->ppcm_idx[sdev->num_playback - 1]) {
225		idx = path == SND_SOC_USB_KCTL_CARD_ROUTE ?
226				component->card->snd_card->number :
227				q6usb_get_pcm_id(component);
228	}
229
230out:
231	route[0] = idx;
232	mutex_unlock(&data->mutex);
233
234	return ret;
235}
236
237static int q6usb_alsa_connection_cb(struct snd_soc_usb *usb,
238				    struct snd_soc_usb_device *sdev, bool connected)
239{
240	struct q6usb_port_data *data;
241
242	if (!usb->component)
243		return -ENODEV;
244
245	data = dev_get_drvdata(usb->component->dev);
246
247	mutex_lock(&data->mutex);
248	if (connected) {
249		if (data->hs_jack)
250			snd_jack_report(data->hs_jack->jack, SND_JACK_USB);
251
252		/* Selects the latest USB headset plugged in for offloading */
253		list_add_tail(&sdev->list, &data->devices);
254	} else {
255		list_del(&sdev->list);
256
257		if (data->hs_jack)
258			snd_jack_report(data->hs_jack->jack, 0);
259	}
260	mutex_unlock(&data->mutex);
261
262	return 0;
263}
264
265static void q6usb_component_disable_jack(struct q6usb_port_data *data)
266{
267	/* Offload jack has already been disabled */
268	if (!data->hs_jack)
269		return;
270
271	snd_jack_report(data->hs_jack->jack, 0);
272	data->hs_jack = NULL;
273}
274
275static void q6usb_component_enable_jack(struct q6usb_port_data *data,
276					struct snd_soc_jack *jack)
277{
278	snd_jack_report(jack->jack, !list_empty(&data->devices) ? SND_JACK_USB : 0);
279	data->hs_jack = jack;
280}
281
282static int q6usb_component_set_jack(struct snd_soc_component *component,
283				    struct snd_soc_jack *jack, void *priv)
284{
285	struct q6usb_port_data *data = dev_get_drvdata(component->dev);
286
287	mutex_lock(&data->mutex);
288	if (jack)
289		q6usb_component_enable_jack(data, jack);
290	else
291		q6usb_component_disable_jack(data);
292	mutex_unlock(&data->mutex);
293
294	return 0;
295}
296
297static void q6usb_dai_aux_release(struct device *dev) {}
298
299static int q6usb_dai_add_aux_device(struct q6usb_port_data *data,
300				    struct auxiliary_device *auxdev)
301{
302	int ret;
303
304	auxdev->dev.parent = data->priv.dev;
305	auxdev->dev.release = q6usb_dai_aux_release;
306	auxdev->name = "qc-usb-audio-offload";
307
308	ret = auxiliary_device_init(auxdev);
309	if (ret)
310		return ret;
311
312	ret = auxiliary_device_add(auxdev);
313	if (ret)
314		auxiliary_device_uninit(auxdev);
315
316	return ret;
317}
318
319static int q6usb_component_probe(struct snd_soc_component *component)
320{
321	struct q6usb_port_data *data = dev_get_drvdata(component->dev);
322	struct snd_soc_usb *usb;
323	int ret;
324
325	/* Add the QC USB SND aux device */
326	ret = q6usb_dai_add_aux_device(data, &data->uauxdev);
327	if (ret < 0)
328		return ret;
329
330	usb = snd_soc_usb_allocate_port(component, &data->priv);
331	if (IS_ERR(usb))
332		return -ENOMEM;
333
334	usb->connection_status_cb = q6usb_alsa_connection_cb;
335	usb->update_offload_route_info = q6usb_update_offload_route;
336
337	snd_soc_usb_add_port(usb);
338	data->usb = usb;
339
340	return 0;
341}
342
343static void q6usb_component_remove(struct snd_soc_component *component)
344{
345	struct q6usb_port_data *data = dev_get_drvdata(component->dev);
346
347	snd_soc_usb_remove_port(data->usb);
348	auxiliary_device_delete(&data->uauxdev);
349	auxiliary_device_uninit(&data->uauxdev);
350	snd_soc_usb_free_port(data->usb);
351}
352
353static const struct snd_soc_component_driver q6usb_dai_component = {
354	.probe = q6usb_component_probe,
355	.set_jack = q6usb_component_set_jack,
356	.remove = q6usb_component_remove,
357	.name = "q6usb-dai-component",
358	.dapm_widgets = q6usb_dai_widgets,
359	.num_dapm_widgets = ARRAY_SIZE(q6usb_dai_widgets),
360	.dapm_routes = q6usb_dapm_routes,
361	.num_dapm_routes = ARRAY_SIZE(q6usb_dapm_routes),
362	.of_xlate_dai_name = q6usb_audio_ports_of_xlate_dai_name,
363};
364
365static int q6usb_dai_dev_probe(struct platform_device *pdev)
366{
367	struct device_node *node = pdev->dev.of_node;
368	struct q6usb_port_data *data;
369	struct device *dev = &pdev->dev;
370	struct of_phandle_args args;
371	int ret;
372
373	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
374	if (!data)
375		return -ENOMEM;
376
377	ret = of_property_read_u16(node, "qcom,usb-audio-intr-idx",
378				   &data->priv.intr_num);
379	if (ret) {
380		dev_err(&pdev->dev, "failed to read intr idx.\n");
381		return ret;
382	}
383
384	ret = of_parse_phandle_with_fixed_args(node, "iommus", 1, 0, &args);
385	if (!ret)
386		data->priv.sid = args.args[0] & Q6_USB_SID_MASK;
387
388	ret = devm_mutex_init(dev, &data->mutex);
389	if (ret < 0)
390		return ret;
391
392	data->priv.domain = iommu_get_domain_for_dev(&pdev->dev);
393
394	data->priv.dev = dev;
395	INIT_LIST_HEAD(&data->devices);
396	dev_set_drvdata(dev, data);
397
398	return devm_snd_soc_register_component(dev, &q6usb_dai_component,
399					q6usb_be_dais, ARRAY_SIZE(q6usb_be_dais));
400}
401
402static const struct of_device_id q6usb_dai_device_id[] = {
403	{ .compatible = "qcom,q6usb" },
404	{},
405};
406MODULE_DEVICE_TABLE(of, q6usb_dai_device_id);
407
408static struct platform_driver q6usb_dai_platform_driver = {
409	.driver = {
410		.name = "q6usb-dai",
411		.of_match_table = q6usb_dai_device_id,
412	},
413	.probe = q6usb_dai_dev_probe,
414	/*
415	 * Remove not required as resources are cleaned up as part of
416	 * component removal.  Others are device managed resources.
417	 */
418};
419module_platform_driver(q6usb_dai_platform_driver);
420
421MODULE_DESCRIPTION("Q6 USB backend dai driver");
422MODULE_LICENSE("GPL");