sound/aoa/core/snd-aoa-alsa.c

   1 /*
   2  * Apple Onboard Audio Alsa helpers
   3  *
   4  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * GPL v2, can be found in COPYING.
   7  */
   8 #include <linux/module.h>
   9 #include "snd-aoa-alsa.h"
  10
  11 static int index = -1;
  12 module_param(index, int, 0444);
  13 MODULE_PARM_DESC(index, "index for AOA sound card.");
  14
  15 static struct aoa_card *aoa_card;
  16
  17 int aoa_alsa_init(char *name, struct module *mod)
  18 {
  19         struct snd_card *alsa_card;
  20         int err;
  21
  22         if (aoa_card)
  23                 /* cannot be EEXIST due to usage in aoa_fabric_register */
  24                 return -EBUSY;
  25
  26         alsa_card = snd_card_new(index, name, mod, sizeof(struct aoa_card));
  27         if (!alsa_card)
  28                 return -ENOMEM;
  29         aoa_card = alsa_card->private_data;
  30         aoa_card->alsa_card = alsa_card;
  31         strlcpy(alsa_card->driver, "AppleOnbdAudio", sizeof(alsa_card->driver));
  32         strlcpy(alsa_card->shortname, name, sizeof(alsa_card->shortname));
  33         strlcpy(alsa_card->longname, name, sizeof(alsa_card->longname));
  34         strlcpy(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
  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
  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
  61 int aoa_snd_device_new(snd_device_type_t type,
  62         void * device_data, 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
  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);