sound/aoa/core/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 "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, struct device *dev)
  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         err = snd_card_create(index, name, mod, sizeof(struct aoa_card),
  27                               &alsa_card);
  28         if (err < 0)
  29                 return err;
  30         aoa_card = alsa_card->private_data;
  31         aoa_card->alsa_card = alsa_card;
  32         alsa_card->dev = dev;
  33         strlcpy(alsa_card->driver, "AppleOnbdAudio", sizeof(alsa_card->driver));
  34         strlcpy(alsa_card->shortname, name, sizeof(alsa_card->shortname));
  35         strlcpy(alsa_card->longname, name, sizeof(alsa_card->longname));
  36         strlcpy(alsa_card->mixername, name, sizeof(alsa_card->mixername));
  37         err = snd_card_register(aoa_card->alsa_card);
  38         if (err < 0) {
  39                 printk(KERN_ERR "snd-aoa: couldn't register alsa card\n");
  40                 snd_card_free(aoa_card->alsa_card);
  41                 aoa_card = NULL;
  42                 return err;
  43         }
  44         return 0;
  45 }
  46
  47 struct snd_card *aoa_get_card(void)
  48 {
  49         if (aoa_card)
  50                 return aoa_card->alsa_card;
  51         return NULL;
  52 }
  53 EXPORT_SYMBOL_GPL(aoa_get_card);
  54
  55 void aoa_alsa_cleanup(void)
  56 {
  57         if (aoa_card) {
  58                 snd_card_free(aoa_card->alsa_card);
  59                 aoa_card = NULL;
  60         }
  61 }
  62
  63 int aoa_snd_device_new(snd_device_type_t type,
  64                        void * device_data, struct snd_device_ops * ops)
  65 {
  66         struct snd_card *card = aoa_get_card();
  67         int err;
  68
  69         if (!card) return -ENOMEM;
  70
  71         err = snd_device_new(card, type, device_data, ops);
  72         if (err) {
  73                 printk(KERN_ERR "snd-aoa: failed to create snd device (%d)\n", err);
  74                 return err;
  75         }
  76         err = snd_device_register(card, device_data);
  77         if (err) {
  78                 printk(KERN_ERR "snd-aoa: failed to register "
  79                                 "snd device (%d)\n", err);
  80                 printk(KERN_ERR "snd-aoa: have you forgotten the "
  81                                 "dev_register callback?\n");
  82                 snd_device_free(card, device_data);
  83         }
  84         return err;
  85 }
  86 EXPORT_SYMBOL_GPL(aoa_snd_device_new);
  87
  88 int aoa_snd_ctl_add(struct snd_kcontrol* control)
  89 {
  90         int err;
  91
  92         if (!aoa_card) return -ENODEV;
  93
  94         err = snd_ctl_add(aoa_card->alsa_card, control);
  95         if (err)
  96                 printk(KERN_ERR "snd-aoa: failed to add alsa control (%d)\n",
  97                        err);
  98         return err;
  99 }
 100 EXPORT_SYMBOL_GPL(aoa_snd_ctl_add);