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>
 13MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
 14MODULE_LICENSE("GPL");
 15MODULE_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
 23struct toonie {
 24	struct aoa_codec	codec;
 25};
 26#define codec_to_toonie(c) container_of(c, struct toonie, codec)
 27
 28static int toonie_dev_register(struct snd_device *dev)
 29{
 30	return 0;
 31}
 32
 33static const struct snd_device_ops ops = {
 34	.dev_register = toonie_dev_register,
 35};
 36
 37static 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
 53static 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
 61static 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
 67static int toonie_resume(struct codec_info_item *cii)
 68{
 69	return 0;
 70}
 71#endif /* CONFIG_PM */
 72
 73static 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
 85static 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
109static 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
120static struct toonie *toonie;
121
122static 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");
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
142static void __exit toonie_exit(void)
143{
144	aoa_codec_unregister(&toonie->codec);
145	kfree(toonie);
146}
147
148module_init(toonie_init);
149module_exit(toonie_exit);