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Kenneth Westfield79119c72015-03-13 01:01:05 -07001/*
2 * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board
14 */
15
16#include <linux/device.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/mod_devicetable.h>
20#include <linux/platform_device.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/soc.h>
24
25#define STORM_SYSCLK_MULT 4
26
27static int storm_ops_hw_params(struct snd_pcm_substream *substream,
28 struct snd_pcm_hw_params *params)
29{
30 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
31 struct snd_soc_card *card = soc_runtime->card;
32 snd_pcm_format_t format = params_format(params);
33 unsigned int rate = params_rate(params);
34 unsigned int sysclk_freq;
35 int bitwidth, ret;
36
37 bitwidth = snd_pcm_format_width(format);
38 if (bitwidth < 0) {
39 dev_err(card->dev, "%s() invalid bit width given: %d\n",
40 __func__, bitwidth);
41 return bitwidth;
42 }
43
44 /*
45 * as the CPU DAI is the I2S bus master and no system clock is needed by
46 * the MAX98357a DAC, simply set the system clock to be a constant
47 * multiple of the bit clock for the clock divider
48 */
49 sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;
50
51 ret = snd_soc_dai_set_sysclk(soc_runtime->cpu_dai, 0, sysclk_freq, 0);
52 if (ret) {
53 dev_err(card->dev, "%s() error setting sysclk to %u: %d\n",
54 __func__, sysclk_freq, ret);
55 return ret;
56 }
57
58 return 0;
59}
60
61static struct snd_soc_ops storm_soc_ops = {
62 .hw_params = storm_ops_hw_params,
63};
64
65static struct snd_soc_dai_link storm_dai_link = {
66 .name = "Primary",
67 .stream_name = "Primary",
68 .codec_dai_name = "HiFi",
69 .ops = &storm_soc_ops,
70};
71
Kenneth Westfield79119c72015-03-13 01:01:05 -070072static int storm_parse_of(struct snd_soc_card *card)
73{
74 struct snd_soc_dai_link *dai_link = card->dai_link;
75 struct device_node *np = card->dev->of_node;
76
77 dai_link->cpu_of_node = of_parse_phandle(np, "cpu", 0);
78 if (!dai_link->cpu_of_node) {
79 dev_err(card->dev, "%s() error getting cpu phandle\n",
80 __func__);
81 return -EINVAL;
82 }
83 dai_link->platform_of_node = dai_link->cpu_of_node;
84
85 dai_link->codec_of_node = of_parse_phandle(np, "codec", 0);
86 if (!dai_link->codec_of_node) {
87 dev_err(card->dev, "%s() error getting codec phandle\n",
88 __func__);
89 return -EINVAL;
90 }
91
92 return 0;
93}
94
95static int storm_platform_probe(struct platform_device *pdev)
96{
Srinivas Kandagatla21e904b2015-06-09 14:34:21 +010097 struct snd_soc_card *card;
Kenneth Westfield79119c72015-03-13 01:01:05 -070098 int ret;
99
Srinivas Kandagatla21e904b2015-06-09 14:34:21 +0100100 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
101 if (!card)
102 return -ENOMEM;
103
Kenneth Westfield79119c72015-03-13 01:01:05 -0700104 card->dev = &pdev->dev;
105 platform_set_drvdata(pdev, card);
106
107 ret = snd_soc_of_parse_card_name(card, "qcom,model");
108 if (ret) {
109 dev_err(&pdev->dev, "%s() error parsing card name: %d\n",
110 __func__, ret);
111 return ret;
112 }
113
114 card->dai_link = &storm_dai_link;
115 card->num_links = 1;
116
117 ret = storm_parse_of(card);
118 if (ret) {
119 dev_err(&pdev->dev, "%s() error resolving dai links: %d\n",
120 __func__, ret);
121 return ret;
122 }
123
124 ret = devm_snd_soc_register_card(&pdev->dev, card);
Srinivas Kandagatla2682c7c2015-06-09 14:35:22 +0100125 if (ret)
Kenneth Westfield79119c72015-03-13 01:01:05 -0700126 dev_err(&pdev->dev, "%s() error registering soundcard: %d\n",
127 __func__, ret);
Kenneth Westfield79119c72015-03-13 01:01:05 -0700128
Srinivas Kandagatla2682c7c2015-06-09 14:35:22 +0100129 return ret;
130
Kenneth Westfield79119c72015-03-13 01:01:05 -0700131}
132
133#ifdef CONFIG_OF
134static const struct of_device_id storm_device_id[] = {
135 { .compatible = "google,storm-audio" },
136 {},
137};
138MODULE_DEVICE_TABLE(of, storm_device_id);
139#endif
140
141static struct platform_driver storm_platform_driver = {
142 .driver = {
143 .name = "storm-audio",
144 .of_match_table =
145 of_match_ptr(storm_device_id),
146 },
147 .probe = storm_platform_probe,
148};
149module_platform_driver(storm_platform_driver);
150
151MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
152MODULE_LICENSE("GPL v2");