sound/aoa/codecs/toonie.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Apple Onboard Audio driver for Toonie codec
   4  *
   5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This is a driver for the toonie codec chip. This chip is present
   8  * on the Mac Mini and is nothing but a DAC.
   9  */
  10 #include <linux/delay.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  14 MODULE_LICENSE("GPL");
  15 MODULE_DESCRIPTION("toonie codec driver for snd-aoa");
  16
  17 #include "../aoa.h"
  18 #include "../soundbus/soundbus.h"
  19
  20
  21 #define PFX "snd-aoa-codec-toonie: "
  22
  23 struct toonie {
  24         struct aoa_codec        codec;
  25 };
  26 #define codec_to_toonie(c) container_of(c, struct toonie, codec)
  27
  28 static int toonie_dev_register(struct snd_device *dev)
  29 {
  30         return 0;
  31 }
  32
  33 static const struct snd_device_ops ops = {
  34         .dev_register = toonie_dev_register,
  35 };
  36
  37 static struct transfer_info toonie_transfers[] = {
  38         /* This thing *only* has analog output,
  39          * the rates are taken from Info.plist
  40          * from Darwin. */
  41         {
  42                 .formats = SNDRV_PCM_FMTBIT_S16_BE |
  43                            SNDRV_PCM_FMTBIT_S24_BE,
  44                 .rates = SNDRV_PCM_RATE_32000 |
  45                          SNDRV_PCM_RATE_44100 |
  46                          SNDRV_PCM_RATE_48000 |
  47                          SNDRV_PCM_RATE_88200 |
  48                          SNDRV_PCM_RATE_96000,
  49         },
  50         {}
  51 };
  52
  53 static int toonie_usable(struct codec_info_item *cii,
  54                          struct transfer_info *ti,
  55                          struct transfer_info *out)
  56 {
  57         return 1;
  58 }
  59
  60 #ifdef CONFIG_PM
  61 static int toonie_suspend(struct codec_info_item *cii, pm_message_t state)
  62 {
  63         /* can we turn it off somehow? */
  64         return 0;
  65 }
  66
  67 static int toonie_resume(struct codec_info_item *cii)
  68 {
  69         return 0;
  70 }
  71 #endif /* CONFIG_PM */
  72
  73 static struct codec_info toonie_codec_info = {
  74         .transfers = toonie_transfers,
  75         .sysclock_factor = 256,
  76         .bus_factor = 64,
  77         .owner = THIS_MODULE,
  78         .usable = toonie_usable,
  79 #ifdef CONFIG_PM
  80         .suspend = toonie_suspend,
  81         .resume = toonie_resume,
  82 #endif
  83 };
  84
  85 static int toonie_init_codec(struct aoa_codec *codec)
  86 {
  87         struct toonie *toonie = codec_to_toonie(codec);
  88
  89         /* nothing connected? what a joke! */
  90         if (toonie->codec.connected != 1)
  91                 return -ENOTCONN;
  92
  93         if (aoa_snd_device_new(SNDRV_DEV_CODEC, toonie, &ops)) {
  94                 printk(KERN_ERR PFX "failed to create toonie snd device!\n");
  95                 return -ENODEV;
  96         }
  97
  98         if (toonie->codec.soundbus_dev->attach_codec(toonie->codec.soundbus_dev,
  99                                                      aoa_get_card(),
 100                                                      &toonie_codec_info, toonie)) {
 101                 printk(KERN_ERR PFX "error creating toonie pcm\n");
 102                 snd_device_free(aoa_get_card(), toonie);
 103                 return -ENODEV;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static void toonie_exit_codec(struct aoa_codec *codec)
 110 {
 111         struct toonie *toonie = codec_to_toonie(codec);
 112
 113         if (!toonie->codec.soundbus_dev) {
 114                 printk(KERN_ERR PFX "toonie_exit_codec called without soundbus_dev!\n");
 115                 return;
 116         }
 117         toonie->codec.soundbus_dev->detach_codec(toonie->codec.soundbus_dev, toonie);
 118 }
 119
 120 static struct toonie *toonie;
 121
 122 static int __init toonie_init(void)
 123 {
 124         toonie = kzalloc(sizeof(struct toonie), GFP_KERNEL);
 125
 126         if (!toonie)
 127                 return -ENOMEM;
 128
 129         strscpy(toonie->codec.name, "toonie", sizeof(toonie->codec.name));
 130         toonie->codec.owner = THIS_MODULE;
 131         toonie->codec.init = toonie_init_codec;
 132         toonie->codec.exit = toonie_exit_codec;
 133
 134         if (aoa_codec_register(&toonie->codec)) {
 135                 kfree(toonie);
 136                 return -EINVAL;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static void __exit toonie_exit(void)
 143 {
 144         aoa_codec_unregister(&toonie->codec);
 145         kfree(toonie);
 146 }
 147
 148 module_init(toonie_init);
 149 module_exit(toonie_exit);