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