1// SPDX-License-Identifier: GPL-2.0+
  2// Copyright 2017-2020 NXP
  3
  4#include <linux/module.h>
  5#include <linux/of_platform.h>
  6#include <linux/of_reserved_mem.h>
  7#include <linux/i2c.h>
  8#include <linux/slab.h>
  9#include <linux/clk.h>
 10#include <sound/soc.h>
 11#include <sound/jack.h>
 12#include <sound/control.h>
 13#include <sound/pcm_params.h>
 14#include <sound/soc-dapm.h>
 15#include "imx-pcm-rpmsg.h"
 16
 17struct imx_rpmsg {
 18	struct snd_soc_dai_link dai;
 19	struct snd_soc_card card;
 20	unsigned long sysclk;
 21	bool lpa;
 22};
 23
 24static struct dev_pm_ops lpa_pm;
 25
 26static const struct snd_soc_dapm_widget imx_rpmsg_dapm_widgets[] = {
 27	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 28	SND_SOC_DAPM_SPK("Ext Spk", NULL),
 29	SND_SOC_DAPM_MIC("Mic Jack", NULL),
 30	SND_SOC_DAPM_MIC("Main MIC", NULL),
 31};
 32
 33static int imx_rpmsg_late_probe(struct snd_soc_card *card)
 34{
 35	struct imx_rpmsg *data = snd_soc_card_get_drvdata(card);
 36	struct snd_soc_pcm_runtime *rtd = list_first_entry(&card->rtd_list,
 37							   struct snd_soc_pcm_runtime, list);
 38	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 39	struct device *dev = card->dev;
 40	int ret;
 41
 42	if (data->lpa) {
 43		struct snd_soc_component *codec_comp;
 44		struct device_node *codec_np;
 45		struct device_driver *codec_drv;
 46		struct device *codec_dev = NULL;
 47
 48		codec_np = data->dai.codecs->of_node;
 49		if (codec_np) {
 50			struct platform_device *codec_pdev;
 51			struct i2c_client *codec_i2c;
 52
 53			codec_i2c = of_find_i2c_device_by_node(codec_np);
 54			if (codec_i2c)
 55				codec_dev = &codec_i2c->dev;
 56			if (!codec_dev) {
 57				codec_pdev = of_find_device_by_node(codec_np);
 58				if (codec_pdev)
 59					codec_dev = &codec_pdev->dev;
 60			}
 61		}
 62		if (codec_dev) {
 63			codec_comp = snd_soc_lookup_component_nolocked(codec_dev, NULL);
 64			if (codec_comp) {
 65				int i, num_widgets;
 66				const char *widgets;
 67				struct snd_soc_dapm_context *dapm;
 68
 69				num_widgets = of_property_count_strings(data->card.dev->of_node,
 70									"ignore-suspend-widgets");
 71				for (i = 0; i < num_widgets; i++) {
 72					of_property_read_string_index(data->card.dev->of_node,
 73								      "ignore-suspend-widgets",
 74								      i, &widgets);
 75					dapm = snd_soc_component_get_dapm(codec_comp);
 76					snd_soc_dapm_ignore_suspend(dapm, widgets);
 77				}
 78			}
 79			codec_drv = codec_dev->driver;
 80			if (codec_drv->pm) {
 81				memcpy(&lpa_pm, codec_drv->pm, sizeof(lpa_pm));
 82				lpa_pm.suspend = NULL;
 83				lpa_pm.resume = NULL;
 84				lpa_pm.freeze = NULL;
 85				lpa_pm.thaw = NULL;
 86				lpa_pm.poweroff = NULL;
 87				lpa_pm.restore = NULL;
 88				codec_drv->pm = &lpa_pm;
 89			}
 90			put_device(codec_dev);
 91		}
 92	}
 93
 94	if (!data->sysclk)
 95		return 0;
 96
 97	ret = snd_soc_dai_set_sysclk(codec_dai, 0, data->sysclk, SND_SOC_CLOCK_IN);
 98	if (ret && ret != -ENOTSUPP) {
 99		dev_err(dev, "failed to set sysclk in %s\n", __func__);
100		return ret;
101	}
102
103	return 0;
104}
105
106static int imx_rpmsg_probe(struct platform_device *pdev)
107{
108	struct snd_soc_dai_link_component *dlc;
109	struct snd_soc_dai *cpu_dai;
110	struct device_node *np = NULL;
111	struct of_phandle_args args;
112	const char *platform_name;
113	struct imx_rpmsg *data;
114	int ret = 0;
115
116	dlc = devm_kzalloc(&pdev->dev, 3 * sizeof(*dlc), GFP_KERNEL);
117	if (!dlc)
118		return -ENOMEM;
119
120	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
121	if (!data) {
122		ret = -ENOMEM;
123		goto fail;
124	}
125
126	data->dai.cpus = &dlc[0];
127	data->dai.num_cpus = 1;
128	data->dai.platforms = &dlc[1];
129	data->dai.num_platforms = 1;
130	data->dai.codecs = &dlc[2];
131	data->dai.num_codecs = 1;
132
133	data->dai.name = "rpmsg hifi";
134	data->dai.stream_name = "rpmsg hifi";
135	data->dai.dai_fmt = SND_SOC_DAIFMT_I2S |
136			    SND_SOC_DAIFMT_NB_NF |
137			    SND_SOC_DAIFMT_CBC_CFC;
138
139	/*
140	 * i.MX rpmsg sound cards work on codec slave mode. MCLK will be
141	 * disabled by CPU DAI driver in hw_free(). Some codec requires MCLK
142	 * present at power up/down sequence. So need to set ignore_pmdown_time
143	 * to power down codec immediately before MCLK is turned off.
144	 */
145	data->dai.ignore_pmdown_time = 1;
146
147	data->dai.cpus->dai_name = pdev->dev.platform_data;
148	cpu_dai = snd_soc_find_dai(data->dai.cpus);
149	if (!cpu_dai) {
150		ret = -EPROBE_DEFER;
151		goto fail;
152	}
153	np = cpu_dai->dev->of_node;
154	if (!np) {
155		dev_err(&pdev->dev, "failed to parse CPU DAI device node\n");
156		ret = -ENODEV;
157		goto fail;
158	}
159
160	ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
161	if (ret)
162		dev_warn(&pdev->dev, "no reserved DMA memory\n");
163
164	/* Optional codec node */
165	ret = of_parse_phandle_with_fixed_args(np, "audio-codec", 0, 0, &args);
166	if (ret) {
167		*data->dai.codecs = snd_soc_dummy_dlc;
168	} else {
169		struct clk *clk;
170
171		ret = snd_soc_get_dlc(&args, data->dai.codecs);
172		if (ret) {
173			dev_err(&pdev->dev, "Unable to get codec_dai_name\n");
174			goto fail;
175		}
176
177		clk = devm_get_clk_from_child(&pdev->dev, args.np, NULL);
178		if (!IS_ERR(clk))
179			data->sysclk = clk_get_rate(clk);
180	}
181
182	if (!of_property_read_string(np, "fsl,rpmsg-channel-name", &platform_name))
183		data->dai.platforms->name = platform_name;
184	else
185		data->dai.platforms->name = "rpmsg-audio-channel";
186	data->dai.playback_only = true;
187	data->dai.capture_only = true;
188	data->card.num_links = 1;
189	data->card.dai_link = &data->dai;
190
191	if (of_property_read_bool(np, "fsl,rpmsg-out"))
192		data->dai.capture_only = false;
193
194	if (of_property_read_bool(np, "fsl,rpmsg-in"))
195		data->dai.playback_only = false;
196
197	if (data->dai.playback_only && data->dai.capture_only) {
198		dev_err(&pdev->dev, "no enabled rpmsg DAI link\n");
199		ret = -EINVAL;
200		goto fail;
201	}
202
203	if (of_property_read_bool(np, "fsl,enable-lpa"))
204		data->lpa = true;
205
206	data->card.dev = &pdev->dev;
207	data->card.owner = THIS_MODULE;
208	data->card.dapm_widgets = imx_rpmsg_dapm_widgets;
209	data->card.num_dapm_widgets = ARRAY_SIZE(imx_rpmsg_dapm_widgets);
210	data->card.late_probe = imx_rpmsg_late_probe;
211	/*
212	 * Inoder to use common api to get card name and audio routing.
213	 * Use parent of_node for this device, revert it after finishing using
214	 */
215	data->card.dev->of_node = np;
216
217	ret = snd_soc_of_parse_card_name(&data->card, "model");
218	if (ret)
219		goto fail;
220
221	if (of_property_read_bool(np, "audio-routing")) {
222		ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
223		if (ret) {
224			dev_err(&pdev->dev, "failed to parse audio-routing: %d\n", ret);
225			goto fail;
226		}
227	}
228
229	platform_set_drvdata(pdev, &data->card);
230	snd_soc_card_set_drvdata(&data->card, data);
231	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
232	if (ret) {
233		dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
234		goto fail;
235	}
236
237fail:
238	pdev->dev.of_node = NULL;
239	return ret;
240}
241
242static struct platform_driver imx_rpmsg_driver = {
243	.driver = {
244		.name = "imx-audio-rpmsg",
245		.pm = &snd_soc_pm_ops,
246	},
247	.probe = imx_rpmsg_probe,
248};
249module_platform_driver(imx_rpmsg_driver);
250
251MODULE_DESCRIPTION("Freescale SoC Audio RPMSG Machine Driver");
252MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
253MODULE_ALIAS("platform:imx-audio-rpmsg");
254MODULE_LICENSE("GPL v2");