// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Advanced Linux Sound Architecture
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <linux/kmod.h>
#include <linux/mutex.h>

static int major = CONFIG_SND_MAJOR;
int snd_major;
EXPORT_SYMBOL(snd_major);

static int cards_limit = 1;

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
MODULE_LICENSE("GPL");
module_param(major, int, 0444);
MODULE_PARM_DESC(major, "Major # for sound driver.");
module_param(cards_limit, int, 0444);
MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);

/* this one holds the actual max. card number currently available.
 * as default, it's identical with cards_limit option.  when more
 * modules are loaded manually, this limit number increases, too.
 */
int snd_ecards_limit;
EXPORT_SYMBOL(snd_ecards_limit);

static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
static DEFINE_MUTEX(sound_mutex);

#ifdef CONFIG_MODULES

/**
 * snd_request_card - try to load the card module
 * @card: the card number
 *
 * Tries to load the module "snd-card-X" for the given card number
 * via request_module.  Returns immediately if already loaded.
 */
void snd_request_card(int card)
{
        if (snd_card_locked(card))
                return;
        if (card < 0 || card >= cards_limit)
                return;
        request_module("snd-card-%i", card);
}
EXPORT_SYMBOL(snd_request_card);

static void snd_request_other(int minor)
{
        char *str;

        switch (minor) {
        case SNDRV_MINOR_SEQUENCER:     str = "snd-seq";        break;
        case SNDRV_MINOR_TIMER:         str = "snd-timer";      break;
        default:                        return;
        }
        request_module(str);
}

#endif  /* modular kernel */

/**
 * snd_lookup_minor_data - get user data of a registered device
 * @minor: the minor number
 * @type: device type (SNDRV_DEVICE_TYPE_XXX)
 *
 * Checks that a minor device with the specified type is registered, and returns
 * its user data pointer.
 *
 * This function increments the reference counter of the card instance
 * if an associated instance with the given minor number and type is found.
 * The caller must call snd_card_unref() appropriately later.
 *
 * Return: The user data pointer if the specified device is found. %NULL
 * otherwise.
 */
void *snd_lookup_minor_data(unsigned int minor, int type)
{
        struct snd_minor *mreg;
        void *private_data;

        if (minor >= ARRAY_SIZE(snd_minors))
                return NULL;
        mutex_lock(&sound_mutex);
        mreg = snd_minors[minor];
        if (mreg && mreg->type == type) {
                private_data = mreg->private_data;
                if (private_data && mreg->card_ptr)
                        get_device(&mreg->card_ptr->card_dev);
        } else
                private_data = NULL;
        mutex_unlock(&sound_mutex);
        return private_data;
}
EXPORT_SYMBOL(snd_lookup_minor_data);

#ifdef CONFIG_MODULES
static struct snd_minor *autoload_device(unsigned int minor)
{
        int dev;
        mutex_unlock(&sound_mutex); /* release lock temporarily */
        dev = SNDRV_MINOR_DEVICE(minor);
        if (dev == SNDRV_MINOR_CONTROL) {
                /* /dev/aloadC? */
                int card = SNDRV_MINOR_CARD(minor);
                struct snd_card *ref = snd_card_ref(card);
                if (!ref)
                        snd_request_card(card);
                else
                        snd_card_unref(ref);
        } else if (dev == SNDRV_MINOR_GLOBAL) {
                /* /dev/aloadSEQ */
                snd_request_other(minor);
        }
        mutex_lock(&sound_mutex); /* reacuire lock */
        return snd_minors[minor];
}
#else /* !CONFIG_MODULES */
#define autoload_device(minor)  NULL
#endif /* CONFIG_MODULES */

static int snd_open(struct inode *inode, struct file *file)
{
        unsigned int minor = iminor(inode);
        struct snd_minor *mptr = NULL;
        const struct file_operations *new_fops;
        int err = 0;

        if (minor >= ARRAY_SIZE(snd_minors))
                return -ENODEV;
        mutex_lock(&sound_mutex);
        mptr = snd_minors[minor];
        if (mptr == NULL) {
                mptr = autoload_device(minor);
                if (!mptr) {
                        mutex_unlock(&sound_mutex);
                        return -ENODEV;
                }
        }
        new_fops = fops_get(mptr->f_ops);
        mutex_unlock(&sound_mutex);
        if (!new_fops)
                return -ENODEV;
        replace_fops(file, new_fops);

        if (file->f_op->open)
                err = file->f_op->open(inode, file);
        return err;
}

static const struct file_operations snd_fops =
{
        .owner =        THIS_MODULE,
        .open =         snd_open,
        .llseek =       noop_llseek,
};

#ifdef CONFIG_SND_DYNAMIC_MINORS
static int snd_find_free_minor(int type, struct snd_card *card, int dev)
{
        int minor;

        /* static minors for module auto loading */
        if (type == SNDRV_DEVICE_TYPE_SEQUENCER)
                return SNDRV_MINOR_SEQUENCER;
        if (type == SNDRV_DEVICE_TYPE_TIMER)
                return SNDRV_MINOR_TIMER;

        for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
                /* skip static minors still used for module auto loading */
                if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL)
                        continue;
                if (minor == SNDRV_MINOR_SEQUENCER ||
                    minor == SNDRV_MINOR_TIMER)
                        continue;
                if (!snd_minors[minor])
                        return minor;
        }
        return -EBUSY;
}
#else
static int snd_find_free_minor(int type, struct snd_card *card, int dev)
{
        int minor;

        switch (type) {
        case SNDRV_DEVICE_TYPE_SEQUENCER:
        case SNDRV_DEVICE_TYPE_TIMER:
                minor = type;
                break;
        case SNDRV_DEVICE_TYPE_CONTROL:
                if (snd_BUG_ON(!card))
                        return -EINVAL;
                minor = SNDRV_MINOR(card->number, type);
                break;
        case SNDRV_DEVICE_TYPE_HWDEP:
        case SNDRV_DEVICE_TYPE_RAWMIDI:
        case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
        case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
        case SNDRV_DEVICE_TYPE_COMPRESS:
                if (snd_BUG_ON(!card))
                        return -EINVAL;
                minor = SNDRV_MINOR(card->number, type + dev);
                break;
        default:
                return -EINVAL;
        }
        if (snd_BUG_ON(minor < 0 || minor >= SNDRV_OS_MINORS))
                return -EINVAL;
        if (snd_minors[minor])
                return -EBUSY;
        return minor;
}
#endif

/**
 * snd_register_device - Register the ALSA device file for the card
 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
 * @card: the card instance
 * @dev: the device index
 * @f_ops: the file operations
 * @private_data: user pointer for f_ops->open()
 * @device: the device to register
 *
 * Registers an ALSA device file for the given card.
 * The operators have to be set in reg parameter.
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
int snd_register_device(int type, struct snd_card *card, int dev,
                        const struct file_operations *f_ops,
                        void *private_data, struct device *device)
{
        int minor;
        int err = 0;
        struct snd_minor *preg;

        if (snd_BUG_ON(!device))
                return -EINVAL;

        preg = kmalloc(sizeof *preg, GFP_KERNEL);
        if (preg == NULL)
                return -ENOMEM;
        preg->type = type;
        preg->card = card ? card->number : -1;
        preg->device = dev;
        preg->f_ops = f_ops;
        preg->private_data = private_data;
        preg->card_ptr = card;
        mutex_lock(&sound_mutex);
        minor = snd_find_free_minor(type, card, dev);
        if (minor < 0) {
                err = minor;
                goto error;
        }

        preg->dev = device;
        device->devt = MKDEV(major, minor);
        err = device_add(device);
        if (err < 0)
                goto error;

        snd_minors[minor] = preg;
 error:
        mutex_unlock(&sound_mutex);
        if (err < 0)
                kfree(preg);
        return err;
}
EXPORT_SYMBOL(snd_register_device);

/**
 * snd_unregister_device - unregister the device on the given card
 * @dev: the device instance
 *
 * Unregisters the device file already registered via
 * snd_register_device().
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
int snd_unregister_device(struct device *dev)
{
        int minor;
        struct snd_minor *preg;

        mutex_lock(&sound_mutex);
        for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
                preg = snd_minors[minor];
                if (preg && preg->dev == dev) {
                        snd_minors[minor] = NULL;
                        device_del(dev);
                        kfree(preg);
                        break;
                }
        }
        mutex_unlock(&sound_mutex);
        if (minor >= ARRAY_SIZE(snd_minors))
                return -ENOENT;
        return 0;
}
EXPORT_SYMBOL(snd_unregister_device);

#ifdef CONFIG_SND_PROC_FS
/*
 *  INFO PART
 */
static const char *snd_device_type_name(int type)
{
        switch (type) {
        case SNDRV_DEVICE_TYPE_CONTROL:
                return "control";
        case SNDRV_DEVICE_TYPE_HWDEP:
                return "hardware dependent";
        case SNDRV_DEVICE_TYPE_RAWMIDI:
                return "raw midi";
        case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
                return "digital audio playback";
        case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
                return "digital audio capture";
        case SNDRV_DEVICE_TYPE_SEQUENCER:
                return "sequencer";
        case SNDRV_DEVICE_TYPE_TIMER:
                return "timer";
        default:
                return "?";
        }
}

static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
        int minor;
        struct snd_minor *mptr;

        mutex_lock(&sound_mutex);
        for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
                if (!(mptr = snd_minors[minor]))
                        continue;
                if (mptr->card >= 0) {
                        if (mptr->device >= 0)
                                snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
                                            minor, mptr->card, mptr->device,
                                            snd_device_type_name(mptr->type));
                        else
                                snd_iprintf(buffer, "%3i: [%2i]   : %s\n",
                                            minor, mptr->card,
                                            snd_device_type_name(mptr->type));
                } else
                        snd_iprintf(buffer, "%3i:        : %s\n", minor,
                                    snd_device_type_name(mptr->type));
        }
        mutex_unlock(&sound_mutex);
}

int __init snd_minor_info_init(void)
{
        struct snd_info_entry *entry;

        entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
        if (!entry)
                return -ENOMEM;
        entry->c.text.read = snd_minor_info_read;
        return snd_info_register(entry); /* freed in error path */
}
#endif /* CONFIG_SND_PROC_FS */

/*
 *  INIT PART
 */

static int __init alsa_sound_init(void)
{
        snd_major = major;
        snd_ecards_limit = cards_limit;
        if (register_chrdev(major, "alsa", &snd_fops)) {
                pr_err("ALSA core: unable to register native major device number %d\n", major);
                return -EIO;
        }
        if (snd_info_init() < 0) {
                unregister_chrdev(major, "alsa");
                return -ENOMEM;
        }
#ifndef MODULE
        pr_info("Advanced Linux Sound Architecture Driver Initialized.\n");
#endif
        return 0;
}

static void __exit alsa_sound_exit(void)
{
        snd_info_done();
        unregister_chrdev(major, "alsa");
}

subsys_initcall(alsa_sound_init);
module_exit(alsa_sound_exit);