summaryrefslogtreecommitdiffstats
path: root/sound/soc/fsl/soc-of-simple.c
blob: 53be6491320a944beed760873b766c5fb71f294e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/*
 * OF helpers for ALSA SoC Layer
 *
 * Copyright (C) 2008, Secret Lab Technologies Ltd.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-of-simple.h>
#include <sound/initval.h>

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ALSA SoC OpenFirmware bindings");

static DEFINE_MUTEX(of_snd_soc_mutex);
static LIST_HEAD(of_snd_soc_device_list);
static int of_snd_soc_next_index;

struct of_snd_soc_device {
	int id;
	struct list_head list;
	struct snd_soc_device device;
	struct snd_soc_card card;
	struct snd_soc_dai_link dai_link;
	struct platform_device *pdev;
	struct device_node *platform_node;
	struct device_node *codec_node;
};

static struct snd_soc_ops of_snd_soc_ops = {
};

static struct of_snd_soc_device *
of_snd_soc_get_device(struct device_node *codec_node)
{
	struct of_snd_soc_device *of_soc;

	list_for_each_entry(of_soc, &of_snd_soc_device_list, list) {
		if (of_soc->codec_node == codec_node)
			return of_soc;
	}

	of_soc = kzalloc(sizeof(struct of_snd_soc_device), GFP_KERNEL);
	if (!of_soc)
		return NULL;

	/* Initialize the structure and add it to the global list */
	of_soc->codec_node = codec_node;
	of_soc->id = of_snd_soc_next_index++;
	of_soc->card.dai_link = &of_soc->dai_link;
	of_soc->card.num_links = 1;
	of_soc->device.card = &of_soc->card;
	of_soc->dai_link.ops = &of_snd_soc_ops;
	list_add(&of_soc->list, &of_snd_soc_device_list);

	return of_soc;
}

static void of_snd_soc_register_device(struct of_snd_soc_device *of_soc)
{
	struct platform_device *pdev;
	int rc;

	/* Only register the device if both the codec and platform have
	 * been registered */
	if ((!of_soc->device.codec_data) || (!of_soc->platform_node))
		return;

	pr_info("platform<-->codec match achieved; registering machine\n");

	pdev = platform_device_alloc("soc-audio", of_soc->id);
	if (!pdev) {
		pr_err("of_soc: platform_device_alloc() failed\n");
		return;
	}

	pdev->dev.platform_data = of_soc;
	platform_set_drvdata(pdev, &of_soc->device);
	of_soc->device.dev = &pdev->dev;

	/* The ASoC device is complete; register it */
	rc = platform_device_add(pdev);
	if (rc) {
		pr_err("of_soc: platform_device_add() failed\n");
		return;
	}

}

int of_snd_soc_register_codec(struct snd_soc_codec_device *codec_dev,
			      void *codec_data, struct snd_soc_dai *dai,
			      struct device_node *node)
{
	struct of_snd_soc_device *of_soc;
	int rc = 0;

	pr_info("registering ASoC codec driver: %s\n", node->full_name);

	mutex_lock(&of_snd_soc_mutex);
	of_soc = of_snd_soc_get_device(node);
	if (!of_soc) {
		rc = -ENOMEM;
		goto out;
	}

	/* Store the codec data */
	of_soc->device.codec_data = codec_data;
	of_soc->device.codec_dev = codec_dev;
	of_soc->dai_link.name = (char *)node->name;
	of_soc->dai_link.stream_name = (char *)node->name;
	of_soc->dai_link.codec_dai = dai;

	/* Now try to register the SoC device */
	of_snd_soc_register_device(of_soc);

 out:
	mutex_unlock(&of_snd_soc_mutex);
	return rc;
}
EXPORT_SYMBOL_GPL(of_snd_soc_register_codec);

int of_snd_soc_register_platform(struct snd_soc_platform *platform,
				 struct device_node *node,
				 struct snd_soc_dai *cpu_dai)
{
	struct of_snd_soc_device *of_soc;
	struct device_node *codec_node;
	const phandle *handle;
	int len, rc = 0;

	pr_info("registering ASoC platform driver: %s\n", node->full_name);

	handle = of_get_property(node, "codec-handle", &len);
	if (!handle || len < sizeof(handle))
		return -ENODEV;
	codec_node = of_find_node_by_phandle(*handle);
	if (!codec_node)
		return -ENODEV;
	pr_info("looking for codec: %s\n", codec_node->full_name);

	mutex_lock(&of_snd_soc_mutex);
	of_soc = of_snd_soc_get_device(codec_node);
	if (!of_soc) {
		rc = -ENOMEM;
		goto out;
	}

	of_soc->platform_node = node;
	of_soc->dai_link.cpu_dai = cpu_dai;
	of_soc->device.platform = platform;
	of_soc->card.name = of_soc->dai_link.cpu_dai->name;

	/* Now try to register the SoC device */
	of_snd_soc_register_device(of_soc);

 out:
	mutex_unlock(&of_snd_soc_mutex);
	return rc;
}
EXPORT_SYMBOL_GPL(of_snd_soc_register_platform);
OpenPOWER on IntegriCloud