2 * OF helpers for ALSA SoC Layer
4 * Copyright (C) 2008, Secret Lab Technologies Ltd.
7 #include <linux/module.h>
8 #include <linux/moduleparam.h>
9 #include <linux/init.h>
10 #include <linux/delay.h>
12 #include <linux/bitops.h>
13 #include <linux/platform_device.h>
15 #include <sound/core.h>
16 #include <sound/pcm.h>
17 #include <sound/pcm_params.h>
18 #include <sound/soc.h>
19 #include <sound/soc-of-simple.h>
20 #include <sound/initval.h>
22 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
23 MODULE_LICENSE("GPL");
24 MODULE_DESCRIPTION("ALSA SoC OpenFirmware bindings");
26 static DEFINE_MUTEX(of_snd_soc_mutex);
27 static LIST_HEAD(of_snd_soc_device_list);
28 static int of_snd_soc_next_index;
30 struct of_snd_soc_device {
32 struct list_head list;
33 struct snd_soc_device device;
34 struct snd_soc_card card;
35 struct snd_soc_dai_link dai_link;
36 struct platform_device *pdev;
37 struct device_node *platform_node;
38 struct device_node *codec_node;
41 static struct snd_soc_ops of_snd_soc_ops = {
44 static struct of_snd_soc_device *
45 of_snd_soc_get_device(struct device_node *codec_node)
47 struct of_snd_soc_device *of_soc;
49 list_for_each_entry(of_soc, &of_snd_soc_device_list, list) {
50 if (of_soc->codec_node == codec_node)
54 of_soc = kzalloc(sizeof(struct of_snd_soc_device), GFP_KERNEL);
58 /* Initialize the structure and add it to the global list */
59 of_soc->codec_node = codec_node;
60 of_soc->id = of_snd_soc_next_index++;
61 of_soc->card.dai_link = &of_soc->dai_link;
62 of_soc->card.num_links = 1;
63 of_soc->device.card = &of_soc->card;
64 of_soc->dai_link.ops = &of_snd_soc_ops;
65 list_add(&of_soc->list, &of_snd_soc_device_list);
70 static void of_snd_soc_register_device(struct of_snd_soc_device *of_soc)
72 struct platform_device *pdev;
75 /* Only register the device if both the codec and platform have
77 if ((!of_soc->device.codec_data) || (!of_soc->platform_node))
80 pr_info("platform<-->codec match achieved; registering machine\n");
82 pdev = platform_device_alloc("soc-audio", of_soc->id);
84 pr_err("of_soc: platform_device_alloc() failed\n");
88 pdev->dev.platform_data = of_soc;
89 platform_set_drvdata(pdev, &of_soc->device);
90 of_soc->device.dev = &pdev->dev;
92 /* The ASoC device is complete; register it */
93 rc = platform_device_add(pdev);
95 pr_err("of_soc: platform_device_add() failed\n");
101 int of_snd_soc_register_codec(struct snd_soc_codec_device *codec_dev,
102 void *codec_data, struct snd_soc_dai *dai,
103 struct device_node *node)
105 struct of_snd_soc_device *of_soc;
108 pr_info("registering ASoC codec driver: %s\n", node->full_name);
110 mutex_lock(&of_snd_soc_mutex);
111 of_soc = of_snd_soc_get_device(node);
117 /* Store the codec data */
118 of_soc->device.codec_data = codec_data;
119 of_soc->device.codec_dev = codec_dev;
120 of_soc->dai_link.name = (char *)node->name;
121 of_soc->dai_link.stream_name = (char *)node->name;
122 of_soc->dai_link.codec_dai = dai;
124 /* Now try to register the SoC device */
125 of_snd_soc_register_device(of_soc);
128 mutex_unlock(&of_snd_soc_mutex);
131 EXPORT_SYMBOL_GPL(of_snd_soc_register_codec);
133 int of_snd_soc_register_platform(struct snd_soc_platform *platform,
134 struct device_node *node,
135 struct snd_soc_dai *cpu_dai)
137 struct of_snd_soc_device *of_soc;
138 struct device_node *codec_node;
139 const phandle *handle;
142 pr_info("registering ASoC platform driver: %s\n", node->full_name);
144 handle = of_get_property(node, "codec-handle", &len);
145 if (!handle || len < sizeof(handle))
147 codec_node = of_find_node_by_phandle(*handle);
150 pr_info("looking for codec: %s\n", codec_node->full_name);
152 mutex_lock(&of_snd_soc_mutex);
153 of_soc = of_snd_soc_get_device(codec_node);
159 of_soc->platform_node = node;
160 of_soc->dai_link.cpu_dai = cpu_dai;
161 of_soc->card.platform = platform;
162 of_soc->card.name = of_soc->dai_link.cpu_dai->name;
164 /* Now try to register the SoC device */
165 of_snd_soc_register_device(of_soc);
168 mutex_unlock(&of_snd_soc_mutex);
171 EXPORT_SYMBOL_GPL(of_snd_soc_register_platform);