xref: /linux/sound/aoa/codecs/toonie.c (revision d0034a7a4ac7fae708146ac0059b9c47a1543f0d)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Apple Onboard Audio driver for Toonie codec
4  *
5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6  *
7  * This is a driver for the toonie codec chip. This chip is present
8  * on the Mac Mini and is nothing but a DAC.
9  */
10 #include <linux/delay.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
14 MODULE_LICENSE("GPL");
15 MODULE_DESCRIPTION("toonie codec driver for snd-aoa");
16 
17 #include "../aoa.h"
18 #include "../soundbus/soundbus.h"
19 
20 
21 #define PFX "snd-aoa-codec-toonie: "
22 
23 struct toonie {
24 	struct aoa_codec	codec;
25 };
26 #define codec_to_toonie(c) container_of(c, struct toonie, codec)
27 
toonie_dev_register(struct snd_device * dev)28 static int toonie_dev_register(struct snd_device *dev)
29 {
30 	return 0;
31 }
32 
33 static const struct snd_device_ops ops = {
34 	.dev_register = toonie_dev_register,
35 };
36 
37 static struct transfer_info toonie_transfers[] = {
38 	/* This thing *only* has analog output,
39 	 * the rates are taken from Info.plist
40 	 * from Darwin. */
41 	{
42 		.formats = SNDRV_PCM_FMTBIT_S16_BE |
43 			   SNDRV_PCM_FMTBIT_S24_BE,
44 		.rates = SNDRV_PCM_RATE_32000 |
45 			 SNDRV_PCM_RATE_44100 |
46 			 SNDRV_PCM_RATE_48000 |
47 			 SNDRV_PCM_RATE_88200 |
48 			 SNDRV_PCM_RATE_96000,
49 	},
50 	{}
51 };
52 
toonie_usable(struct codec_info_item * cii,struct transfer_info * ti,struct transfer_info * out)53 static int toonie_usable(struct codec_info_item *cii,
54 			 struct transfer_info *ti,
55 			 struct transfer_info *out)
56 {
57 	return 1;
58 }
59 
60 #ifdef CONFIG_PM
toonie_suspend(struct codec_info_item * cii,pm_message_t state)61 static int toonie_suspend(struct codec_info_item *cii, pm_message_t state)
62 {
63 	/* can we turn it off somehow? */
64 	return 0;
65 }
66 
toonie_resume(struct codec_info_item * cii)67 static int toonie_resume(struct codec_info_item *cii)
68 {
69 	return 0;
70 }
71 #endif /* CONFIG_PM */
72 
73 static struct codec_info toonie_codec_info = {
74 	.transfers = toonie_transfers,
75 	.sysclock_factor = 256,
76 	.bus_factor = 64,
77 	.owner = THIS_MODULE,
78 	.usable = toonie_usable,
79 #ifdef CONFIG_PM
80 	.suspend = toonie_suspend,
81 	.resume = toonie_resume,
82 #endif
83 };
84 
toonie_init_codec(struct aoa_codec * codec)85 static int toonie_init_codec(struct aoa_codec *codec)
86 {
87 	struct toonie *toonie = codec_to_toonie(codec);
88 
89 	/* nothing connected? what a joke! */
90 	if (toonie->codec.connected != 1)
91 		return -ENOTCONN;
92 
93 	if (aoa_snd_device_new(SNDRV_DEV_CODEC, toonie, &ops)) {
94 		printk(KERN_ERR PFX "failed to create toonie snd device!\n");
95 		return -ENODEV;
96 	}
97 
98 	if (toonie->codec.soundbus_dev->attach_codec(toonie->codec.soundbus_dev,
99 						     aoa_get_card(),
100 						     &toonie_codec_info, toonie)) {
101 		printk(KERN_ERR PFX "error creating toonie pcm\n");
102 		snd_device_free(aoa_get_card(), toonie);
103 		return -ENODEV;
104 	}
105 
106 	return 0;
107 }
108 
toonie_exit_codec(struct aoa_codec * codec)109 static void toonie_exit_codec(struct aoa_codec *codec)
110 {
111 	struct toonie *toonie = codec_to_toonie(codec);
112 
113 	if (!toonie->codec.soundbus_dev) {
114 		printk(KERN_ERR PFX "toonie_exit_codec called without soundbus_dev!\n");
115 		return;
116 	}
117 	toonie->codec.soundbus_dev->detach_codec(toonie->codec.soundbus_dev, toonie);
118 }
119 
120 static struct toonie *toonie;
121 
toonie_init(void)122 static int __init toonie_init(void)
123 {
124 	toonie = kzalloc(sizeof(struct toonie), GFP_KERNEL);
125 
126 	if (!toonie)
127 		return -ENOMEM;
128 
129 	strscpy(toonie->codec.name, "toonie", sizeof(toonie->codec.name));
130 	toonie->codec.owner = THIS_MODULE;
131 	toonie->codec.init = toonie_init_codec;
132 	toonie->codec.exit = toonie_exit_codec;
133 
134 	if (aoa_codec_register(&toonie->codec)) {
135 		kfree(toonie);
136 		return -EINVAL;
137 	}
138 
139 	return 0;
140 }
141 
toonie_exit(void)142 static void __exit toonie_exit(void)
143 {
144 	aoa_codec_unregister(&toonie->codec);
145 	kfree(toonie);
146 }
147 
148 module_init(toonie_init);
149 module_exit(toonie_exit);
150