1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * SoC audio for EDB93xx
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * This driver support CS4271 codec being master or slave, working
8*4882a593Smuzhiyun * in control port mode, connected either via SPI or I2C.
9*4882a593Smuzhiyun * The data format accepted is I2S or left-justified.
10*4882a593Smuzhiyun * DAPM support not implemented.
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/platform_device.h>
14*4882a593Smuzhiyun #include <linux/gpio.h>
15*4882a593Smuzhiyun #include <linux/module.h>
16*4882a593Smuzhiyun #include <linux/soc/cirrus/ep93xx.h>
17*4882a593Smuzhiyun #include <sound/core.h>
18*4882a593Smuzhiyun #include <sound/pcm.h>
19*4882a593Smuzhiyun #include <sound/soc.h>
20*4882a593Smuzhiyun #include <asm/mach-types.h>
21*4882a593Smuzhiyun
edb93xx_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)22*4882a593Smuzhiyun static int edb93xx_hw_params(struct snd_pcm_substream *substream,
23*4882a593Smuzhiyun struct snd_pcm_hw_params *params)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
26*4882a593Smuzhiyun struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
27*4882a593Smuzhiyun struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
28*4882a593Smuzhiyun int err;
29*4882a593Smuzhiyun unsigned int mclk_rate;
30*4882a593Smuzhiyun unsigned int rate = params_rate(params);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun /*
33*4882a593Smuzhiyun * According to CS4271 datasheet we use MCLK/LRCK=256 for
34*4882a593Smuzhiyun * rates below 50kHz and 128 for higher sample rates
35*4882a593Smuzhiyun */
36*4882a593Smuzhiyun if (rate < 50000)
37*4882a593Smuzhiyun mclk_rate = rate * 64 * 4;
38*4882a593Smuzhiyun else
39*4882a593Smuzhiyun mclk_rate = rate * 64 * 2;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
42*4882a593Smuzhiyun SND_SOC_CLOCK_IN);
43*4882a593Smuzhiyun if (err)
44*4882a593Smuzhiyun return err;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
47*4882a593Smuzhiyun SND_SOC_CLOCK_OUT);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun static const struct snd_soc_ops edb93xx_ops = {
51*4882a593Smuzhiyun .hw_params = edb93xx_hw_params,
52*4882a593Smuzhiyun };
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun SND_SOC_DAILINK_DEFS(hifi,
55*4882a593Smuzhiyun DAILINK_COMP_ARRAY(COMP_CPU("ep93xx-i2s")),
56*4882a593Smuzhiyun DAILINK_COMP_ARRAY(COMP_CODEC("spi0.0", "cs4271-hifi")),
57*4882a593Smuzhiyun DAILINK_COMP_ARRAY(COMP_PLATFORM("ep93xx-i2s")));
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun static struct snd_soc_dai_link edb93xx_dai = {
60*4882a593Smuzhiyun .name = "CS4271",
61*4882a593Smuzhiyun .stream_name = "CS4271 HiFi",
62*4882a593Smuzhiyun .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
63*4882a593Smuzhiyun SND_SOC_DAIFMT_CBS_CFS,
64*4882a593Smuzhiyun .ops = &edb93xx_ops,
65*4882a593Smuzhiyun SND_SOC_DAILINK_REG(hifi),
66*4882a593Smuzhiyun };
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun static struct snd_soc_card snd_soc_edb93xx = {
69*4882a593Smuzhiyun .name = "EDB93XX",
70*4882a593Smuzhiyun .owner = THIS_MODULE,
71*4882a593Smuzhiyun .dai_link = &edb93xx_dai,
72*4882a593Smuzhiyun .num_links = 1,
73*4882a593Smuzhiyun };
74*4882a593Smuzhiyun
edb93xx_probe(struct platform_device * pdev)75*4882a593Smuzhiyun static int edb93xx_probe(struct platform_device *pdev)
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun struct snd_soc_card *card = &snd_soc_edb93xx;
78*4882a593Smuzhiyun int ret;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun ret = ep93xx_i2s_acquire();
81*4882a593Smuzhiyun if (ret)
82*4882a593Smuzhiyun return ret;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun card->dev = &pdev->dev;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun ret = snd_soc_register_card(card);
87*4882a593Smuzhiyun if (ret) {
88*4882a593Smuzhiyun dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
89*4882a593Smuzhiyun ret);
90*4882a593Smuzhiyun ep93xx_i2s_release();
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun return ret;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
edb93xx_remove(struct platform_device * pdev)96*4882a593Smuzhiyun static int edb93xx_remove(struct platform_device *pdev)
97*4882a593Smuzhiyun {
98*4882a593Smuzhiyun struct snd_soc_card *card = platform_get_drvdata(pdev);
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun snd_soc_unregister_card(card);
101*4882a593Smuzhiyun ep93xx_i2s_release();
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun return 0;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun static struct platform_driver edb93xx_driver = {
107*4882a593Smuzhiyun .driver = {
108*4882a593Smuzhiyun .name = "edb93xx-audio",
109*4882a593Smuzhiyun },
110*4882a593Smuzhiyun .probe = edb93xx_probe,
111*4882a593Smuzhiyun .remove = edb93xx_remove,
112*4882a593Smuzhiyun };
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun module_platform_driver(edb93xx_driver);
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
117*4882a593Smuzhiyun MODULE_DESCRIPTION("ALSA SoC EDB93xx");
118*4882a593Smuzhiyun MODULE_LICENSE("GPL");
119*4882a593Smuzhiyun MODULE_ALIAS("platform:edb93xx-audio");
120