kernel/sound/aoa/codecs/toonie.c

   1 /*
   2  * Apple Onboard Audio driver for Toonie codec
   3  *
   4  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * GPL v2, can be found in COPYING.
   7  *
   8  *
   9  * This is a driver for the toonie codec chip. This chip is present
  10  * on the Mac Mini and is nothing but a DAC.
  11  */
  12 #include <linux/delay.h>
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  16 MODULE_LICENSE("GPL");
  17 MODULE_DESCRIPTION("toonie codec driver for snd-aoa");
  18
  19 #include "../aoa.h"
  20 #include "../soundbus/soundbus.h"
  21
  22
  23 #define PFX "snd-aoa-codec-toonie: "
  24
  25 struct toonie {
  26         struct aoa_codec        codec;
  27 };
  28 #define codec_to_toonie(c) container_of(c, struct toonie, codec)
  29
  30 static int toonie_dev_register(struct snd_device *dev)
  31 {
  32         return 0;
  33 }
  34
  35 static struct snd_device_ops ops = {
  36         .dev_register = toonie_dev_register,
  37 };
  38
  39 static struct transfer_info toonie_transfers[] = {
  40         /* This thing *only* has analog output,
  41          * the rates are taken from Info.plist
  42          * from Darwin. */
  43         {
  44                 .formats = SNDRV_PCM_FMTBIT_S16_BE |
  45                            SNDRV_PCM_FMTBIT_S24_BE,
  46                 .rates = SNDRV_PCM_RATE_32000 |
  47                          SNDRV_PCM_RATE_44100 |
  48                          SNDRV_PCM_RATE_48000 |
  49                          SNDRV_PCM_RATE_88200 |
  50                          SNDRV_PCM_RATE_96000,
  51         },
  52         {}
  53 };
  54
  55 static int toonie_usable(struct codec_info_item *cii,
  56                          struct transfer_info *ti,
  57                          struct transfer_info *out)
  58 {
  59         return 1;
  60 }
  61
  62 #ifdef CONFIG_PM
  63 static int toonie_suspend(struct codec_info_item *cii, pm_message_t state)
  64 {
  65         /* can we turn it off somehow? */
  66         return 0;
  67 }
  68
  69 static int toonie_resume(struct codec_info_item *cii)
  70 {
  71         return 0;
  72 }
  73 #endif /* CONFIG_PM */
  74
  75 static struct codec_info toonie_codec_info = {
  76         .transfers = toonie_transfers,
  77         .sysclock_factor = 256,
  78         .bus_factor = 64,
  79         .owner = THIS_MODULE,
  80         .usable = toonie_usable,
  81 #ifdef CONFIG_PM
  82         .suspend = toonie_suspend,
  83         .resume = toonie_resume,
  84 #endif
  85 };
  86
  87 static int toonie_init_codec(struct aoa_codec *codec)
  88 {
  89         struct toonie *toonie = codec_to_toonie(codec);
  90
  91         /* nothing connected? what a joke! */
  92         if (toonie->codec.connected != 1)
  93                 return -ENOTCONN;
  94
  95         if (aoa_snd_device_new(SNDRV_DEV_CODEC, toonie, &ops)) {
  96                 printk(KERN_ERR PFX "failed to create toonie snd device!\n");
  97                 return -ENODEV;
  98         }
  99
 100         if (toonie->codec.soundbus_dev->attach_codec(toonie->codec.soundbus_dev,
 101                                                      aoa_get_card(),
 102                                                      &toonie_codec_info, toonie)) {
 103                 printk(KERN_ERR PFX "error creating toonie pcm\n");
 104                 snd_device_free(aoa_get_card(), toonie);
 105                 return -ENODEV;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static void toonie_exit_codec(struct aoa_codec *codec)
 112 {
 113         struct toonie *toonie = codec_to_toonie(codec);
 114
 115         if (!toonie->codec.soundbus_dev) {
 116                 printk(KERN_ERR PFX "toonie_exit_codec called without soundbus_dev!\n");
 117                 return;
 118         }
 119         toonie->codec.soundbus_dev->detach_codec(toonie->codec.soundbus_dev, toonie);
 120 }
 121
 122 static struct toonie *toonie;
 123
 124 static int __init toonie_init(void)
 125 {
 126         toonie = kzalloc(sizeof(struct toonie), GFP_KERNEL);
 127
 128         if (!toonie)
 129                 return -ENOMEM;
 130
 131         strlcpy(toonie->codec.name, "toonie", sizeof(toonie->codec.name));
 132         toonie->codec.owner = THIS_MODULE;
 133         toonie->codec.init = toonie_init_codec;
 134         toonie->codec.exit = toonie_exit_codec;
 135
 136         if (aoa_codec_register(&toonie->codec)) {
 137                 kfree(toonie);
 138                 return -EINVAL;
 139         }
 140
 141         return 0;
 142 }
 143
 144 static void __exit toonie_exit(void)
 145 {
 146         aoa_codec_unregister(&toonie->codec);
 147         kfree(toonie);
 148 }
 149
 150 module_init(toonie_init);
 151 module_exit(toonie_exit);