1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun //
3*4882a593Smuzhiyun // dummy_codec.c -- dummy audio codec for rockchip
4*4882a593Smuzhiyun //
5*4882a593Smuzhiyun // Copyright (C) 2018 Fuzhou Rockchip Electronics Co., Ltd
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/clk.h>
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/moduleparam.h>
10*4882a593Smuzhiyun #include <linux/slab.h>
11*4882a593Smuzhiyun #include <linux/of.h>
12*4882a593Smuzhiyun #include <linux/of_gpio.h>
13*4882a593Smuzhiyun #include <sound/soc.h>
14*4882a593Smuzhiyun #include <sound/pcm.h>
15*4882a593Smuzhiyun #include <sound/initval.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun struct dummy_codec_priv {
18*4882a593Smuzhiyun struct snd_soc_component *component;
19*4882a593Smuzhiyun struct clk *mclk;
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
dummy_codec_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)22*4882a593Smuzhiyun static int dummy_codec_startup(struct snd_pcm_substream *substream,
23*4882a593Smuzhiyun struct snd_soc_dai *dai)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct dummy_codec_priv *dcp = snd_soc_component_get_drvdata(dai->component);
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun if (!IS_ERR(dcp->mclk))
28*4882a593Smuzhiyun clk_prepare_enable(dcp->mclk);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun return 0;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
dummy_codec_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)33*4882a593Smuzhiyun static void dummy_codec_shutdown(struct snd_pcm_substream *substream,
34*4882a593Smuzhiyun struct snd_soc_dai *dai)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun struct dummy_codec_priv *dcp = snd_soc_component_get_drvdata(dai->component);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun if (!IS_ERR(dcp->mclk))
39*4882a593Smuzhiyun clk_disable_unprepare(dcp->mclk);
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun static struct snd_soc_dai_ops dummy_codec_dai_ops = {
43*4882a593Smuzhiyun .startup = dummy_codec_startup,
44*4882a593Smuzhiyun .shutdown = dummy_codec_shutdown,
45*4882a593Smuzhiyun };
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun struct snd_soc_dai_driver dummy_dai = {
48*4882a593Smuzhiyun .name = "dummy_codec",
49*4882a593Smuzhiyun .playback = {
50*4882a593Smuzhiyun .stream_name = "Dummy Playback",
51*4882a593Smuzhiyun .channels_min = 1,
52*4882a593Smuzhiyun .channels_max = 384,
53*4882a593Smuzhiyun .rates = SNDRV_PCM_RATE_8000_384000,
54*4882a593Smuzhiyun .formats = (SNDRV_PCM_FMTBIT_S8 |
55*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S16_LE |
56*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S20_3LE |
57*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S24_LE |
58*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S32_LE),
59*4882a593Smuzhiyun },
60*4882a593Smuzhiyun .capture = {
61*4882a593Smuzhiyun .stream_name = "Dummy Capture",
62*4882a593Smuzhiyun .channels_min = 1,
63*4882a593Smuzhiyun .channels_max = 384,
64*4882a593Smuzhiyun .rates = SNDRV_PCM_RATE_8000_384000,
65*4882a593Smuzhiyun .formats = (SNDRV_PCM_FMTBIT_S8 |
66*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S16_LE |
67*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S20_3LE |
68*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S24_LE |
69*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S32_LE),
70*4882a593Smuzhiyun },
71*4882a593Smuzhiyun .ops = &dummy_codec_dai_ops,
72*4882a593Smuzhiyun };
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun static const struct snd_soc_component_driver soc_dummy_codec;
75*4882a593Smuzhiyun
rockchip_dummy_codec_probe(struct platform_device * pdev)76*4882a593Smuzhiyun static int rockchip_dummy_codec_probe(struct platform_device *pdev)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun struct dummy_codec_priv *dcp;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun dcp = devm_kzalloc(&pdev->dev, sizeof(*dcp), GFP_KERNEL);
81*4882a593Smuzhiyun if (!dcp)
82*4882a593Smuzhiyun return -ENOMEM;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun platform_set_drvdata(pdev, dcp);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun /* optional mclk, if needs, assign mclk in dts node */
87*4882a593Smuzhiyun dcp->mclk = devm_clk_get(&pdev->dev, "mclk");
88*4882a593Smuzhiyun if (IS_ERR(dcp->mclk)) {
89*4882a593Smuzhiyun if (PTR_ERR(dcp->mclk) == -EPROBE_DEFER)
90*4882a593Smuzhiyun return -EPROBE_DEFER;
91*4882a593Smuzhiyun else if (PTR_ERR(dcp->mclk) != -ENOENT)
92*4882a593Smuzhiyun return -EINVAL;
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun return devm_snd_soc_register_component(&pdev->dev, &soc_dummy_codec,
96*4882a593Smuzhiyun &dummy_dai, 1);
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun static const struct of_device_id rockchip_dummy_codec_of_match[] = {
100*4882a593Smuzhiyun { .compatible = "rockchip,dummy-codec", },
101*4882a593Smuzhiyun {},
102*4882a593Smuzhiyun };
103*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, rockchip_dummy_codec_of_match);
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun static struct platform_driver rockchip_dummy_codec_driver = {
106*4882a593Smuzhiyun .driver = {
107*4882a593Smuzhiyun .name = "dummy_codec",
108*4882a593Smuzhiyun .of_match_table = of_match_ptr(rockchip_dummy_codec_of_match),
109*4882a593Smuzhiyun },
110*4882a593Smuzhiyun .probe = rockchip_dummy_codec_probe,
111*4882a593Smuzhiyun };
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun module_platform_driver(rockchip_dummy_codec_driver);
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
116*4882a593Smuzhiyun MODULE_DESCRIPTION("Rockchip Dummy Codec Driver");
117*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
118