1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Apple Onboard Audio Alsa helpers
4  *
5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6  */
7 #include <linux/module.h>
8 #include "alsa.h"
9 
10 static int index = -1;
11 module_param(index, int, 0444);
12 MODULE_PARM_DESC(index, "index for AOA sound card.");
13 
14 static struct aoa_card *aoa_card;
15 
aoa_alsa_init(char * name,struct module * mod,struct device * dev)16 int aoa_alsa_init(char *name, struct module *mod, struct device *dev)
17 {
18 	struct snd_card *alsa_card;
19 	int err;
20 
21 	if (aoa_card)
22 		/* cannot be EEXIST due to usage in aoa_fabric_register */
23 		return -EBUSY;
24 
25 	err = snd_card_new(dev, index, name, mod, sizeof(struct aoa_card),
26 			   &alsa_card);
27 	if (err < 0)
28 		return err;
29 	aoa_card = alsa_card->private_data;
30 	aoa_card->alsa_card = alsa_card;
31 	strscpy(alsa_card->driver, "AppleOnbdAudio", sizeof(alsa_card->driver));
32 	strscpy(alsa_card->shortname, name, sizeof(alsa_card->shortname));
33 	strscpy(alsa_card->longname, name, sizeof(alsa_card->longname));
34 	strscpy(alsa_card->mixername, name, sizeof(alsa_card->mixername));
35 	err = snd_card_register(aoa_card->alsa_card);
36 	if (err < 0) {
37 		printk(KERN_ERR "snd-aoa: couldn't register alsa card\n");
38 		snd_card_free(aoa_card->alsa_card);
39 		aoa_card = NULL;
40 		return err;
41 	}
42 	return 0;
43 }
44 
aoa_get_card(void)45 struct snd_card *aoa_get_card(void)
46 {
47 	if (aoa_card)
48 		return aoa_card->alsa_card;
49 	return NULL;
50 }
51 EXPORT_SYMBOL_GPL(aoa_get_card);
52 
aoa_alsa_cleanup(void)53 void aoa_alsa_cleanup(void)
54 {
55 	if (aoa_card) {
56 		snd_card_free(aoa_card->alsa_card);
57 		aoa_card = NULL;
58 	}
59 }
60 
aoa_snd_device_new(enum snd_device_type type,void * device_data,const struct snd_device_ops * ops)61 int aoa_snd_device_new(enum snd_device_type type,
62 		       void *device_data, const struct snd_device_ops *ops)
63 {
64 	struct snd_card *card = aoa_get_card();
65 	int err;
66 
67 	if (!card) return -ENOMEM;
68 
69 	err = snd_device_new(card, type, device_data, ops);
70 	if (err) {
71 		printk(KERN_ERR "snd-aoa: failed to create snd device (%d)\n", err);
72 		return err;
73 	}
74 	err = snd_device_register(card, device_data);
75 	if (err) {
76 		printk(KERN_ERR "snd-aoa: failed to register "
77 				"snd device (%d)\n", err);
78 		printk(KERN_ERR "snd-aoa: have you forgotten the "
79 				"dev_register callback?\n");
80 		snd_device_free(card, device_data);
81 	}
82 	return err;
83 }
84 EXPORT_SYMBOL_GPL(aoa_snd_device_new);
85 
aoa_snd_ctl_add(struct snd_kcontrol * control)86 int aoa_snd_ctl_add(struct snd_kcontrol* control)
87 {
88 	int err;
89 
90 	if (!aoa_card) return -ENODEV;
91 
92 	err = snd_ctl_add(aoa_card->alsa_card, control);
93 	if (err)
94 		printk(KERN_ERR "snd-aoa: failed to add alsa control (%d)\n",
95 		       err);
96 	return err;
97 }
98 EXPORT_SYMBOL_GPL(aoa_snd_ctl_add);
99