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
17 struct imx_rpmsg {
18 struct snd_soc_dai_link dai;
19 struct snd_soc_card card;
20 unsigned long sysclk;
21 bool lpa;
22 };
23
24 static struct dev_pm_ops lpa_pm;
25
26 static 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
33 static 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
106 static 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
237 fail:
238 pdev->dev.of_node = NULL;
239 return ret;
240 }
241
242 static 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 };
249 module_platform_driver(imx_rpmsg_driver);
250
251 MODULE_DESCRIPTION("Freescale SoC Audio RPMSG Machine Driver");
252 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
253 MODULE_ALIAS("platform:imx-audio-rpmsg");
254 MODULE_LICENSE("GPL v2");
255
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