Merge tag 'mfd-next-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
[linux-2.6-block.git] / sound / soc / qcom / storm.c
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 = substream->private_data;
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(soc_runtime->cpu_dai, 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
100         ret = snd_soc_of_parse_card_name(card, "qcom,model");
101         if (ret) {
102                 dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
103                 return ret;
104         }
105
106         card->dai_link  = &storm_dai_link;
107         card->num_links = 1;
108
109         ret = storm_parse_of(card);
110         if (ret) {
111                 dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
112                 return ret;
113         }
114
115         ret = devm_snd_soc_register_card(&pdev->dev, card);
116         if (ret)
117                 dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);
118
119         return ret;
120
121 }
122
123 #ifdef CONFIG_OF
124 static const struct of_device_id storm_device_id[]  = {
125         { .compatible = "google,storm-audio" },
126         {},
127 };
128 MODULE_DEVICE_TABLE(of, storm_device_id);
129 #endif
130
131 static struct platform_driver storm_platform_driver = {
132         .driver = {
133                 .name = "storm-audio",
134                 .of_match_table =
135                         of_match_ptr(storm_device_id),
136         },
137         .probe = storm_platform_probe,
138 };
139 module_platform_driver(storm_platform_driver);
140
141 MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
142 MODULE_LICENSE("GPL v2");