LXR linux/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>
  15MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  16MODULE_LICENSE("GPL");
  17MODULE_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
  25struct toonie {
  26        struct aoa_codec        codec;
  27};
  28#define codec_to_toonie(c) container_of(c, struct toonie, codec)
  29
  30static int toonie_dev_register(struct snd_device *dev)
  31{
  32        return 0;
  33}
  34
  35static struct snd_device_ops ops = {
  36        .dev_register = toonie_dev_register,
  37};
  38
  39static 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
  55static 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
  63static 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
  69static int toonie_resume(struct codec_info_item *cii)
  70{
  71        return 0;
  72}
  73#endif /* CONFIG_PM */
  74
  75static 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
  87static 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
 111static 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
 122static struct toonie *toonie;
 123
 124static 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
 144static void __exit toonie_exit(void)
 145{
 146        aoa_codec_unregister(&toonie->codec);
 147        kfree(toonie);
 148}
 149
 150module_init(toonie_init);
 151module_exit(toonie_exit);
 152