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