1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
4 *
5 * storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board
6 */
7
8 #include <linux/device.h>
9 #include <linux/module.h>
10 #include <linux/of.h>
11 #include <linux/mod_devicetable.h>
12 #include <linux/platform_device.h>
13 #include <sound/pcm.h>
14 #include <sound/pcm_params.h>
15 #include <sound/soc.h>
16
17 #define STORM_SYSCLK_MULT 4
18
19 static int storm_ops_hw_params(struct snd_pcm_substream *substream,
20 struct snd_pcm_hw_params *params)
21 {
22 struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(substream);
23 struct snd_soc_card *card = soc_runtime->card;
24 snd_pcm_format_t format = params_format(params);
25 unsigned int rate = params_rate(params);
26 unsigned int sysclk_freq;
27 int bitwidth, ret;
28
29 bitwidth = snd_pcm_format_width(format);
30 if (bitwidth < 0) {
31 dev_err(card->dev, "invalid bit width given: %d\n", bitwidth);
32 return bitwidth;
33 }
34
35 /*
36 * as the CPU DAI is the I2S bus master and no system clock is needed by
37 * the MAX98357a DAC, simply set the system clock to be a constant
38 * multiple of the bit clock for the clock divider
39 */
40 sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;
41
42 ret = snd_soc_dai_set_sysclk(snd_soc_rtd_to_cpu(soc_runtime, 0), 0, sysclk_freq, 0);
43 if (ret) {
44 dev_err(card->dev, "error setting sysclk to %u: %d\n",
45 sysclk_freq, ret);
46 return ret;
47 }
48
49 return 0;
50 }
51
52 static const struct snd_soc_ops storm_soc_ops = {
53 .hw_params = storm_ops_hw_params,
54 };
55
56 SND_SOC_DAILINK_DEFS(hifi,
57 DAILINK_COMP_ARRAY(COMP_EMPTY()),
58 DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "HiFi")),
59 DAILINK_COMP_ARRAY(COMP_EMPTY()));
60
61 static struct snd_soc_dai_link storm_dai_link = {
62 .name = "Primary",
63 .stream_name = "Primary",
64 .ops = &storm_soc_ops,
65 SND_SOC_DAILINK_REG(hifi),
66 };
67
68 static int storm_parse_of(struct snd_soc_card *card)
69 {
70 struct snd_soc_dai_link *dai_link = card->dai_link;
71 struct device_node *np = card->dev->of_node;
72
73 dai_link->cpus->of_node = of_parse_phandle(np, "cpu", 0);
74 if (!dai_link->cpus->of_node) {
75 dev_err(card->dev, "error getting cpu phandle\n");
76 return -EINVAL;
77 }
78 dai_link->platforms->of_node = dai_link->cpus->of_node;
79
80 dai_link->codecs->of_node = of_parse_phandle(np, "codec", 0);
81 if (!dai_link->codecs->of_node) {
82 dev_err(card->dev, "error getting codec phandle\n");
83 return -EINVAL;
84 }
85
86 return 0;
87 }
88
89 static int storm_platform_probe(struct platform_device *pdev)
90 {
91 struct snd_soc_card *card;
92 int ret;
93
94 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
95 if (!card)
96 return -ENOMEM;
97
98 card->dev = &pdev->dev;
99 card->owner = THIS_MODULE;
100
101 ret = snd_soc_of_parse_card_name(card, "qcom,model");
102 if (ret) {
103 dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
104 return ret;
105 }
106
107 card->dai_link = &storm_dai_link;
108 card->num_links = 1;
109
110 ret = storm_parse_of(card);
111 if (ret) {
112 dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
113 return ret;
114 }
115
116 ret = devm_snd_soc_register_card(&pdev->dev, card);
117 if (ret)
118 dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);
119
120 return ret;
121
122 }
123
124 #ifdef CONFIG_OF
125 static const struct of_device_id storm_device_id[] = {
126 { .compatible = "google,storm-audio" },
127 {},
128 };
129 MODULE_DEVICE_TABLE(of, storm_device_id);
130 #endif
131
132 static struct platform_driver storm_platform_driver = {
133 .driver = {
134 .name = "storm-audio",
135 .of_match_table =
136 of_match_ptr(storm_device_id),
137 },
138 .probe = storm_platform_probe,
139 };
140 module_platform_driver(storm_platform_driver);
141
142 MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
143 MODULE_LICENSE("GPL");
144
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