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