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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Advanced Linux Sound Architecture
0004  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
0005  */
0006 
0007 #include <linux/init.h>
0008 #include <linux/export.h>
0009 #include <linux/slab.h>
0010 #include <linux/time.h>
0011 #include <sound/core.h>
0012 #include <sound/minors.h>
0013 #include <sound/info.h>
0014 #include <linux/sound.h>
0015 #include <linux/mutex.h>
0016 
0017 #define SNDRV_OSS_MINORS 256
0018 
0019 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
0020 static DEFINE_MUTEX(sound_oss_mutex);
0021 
0022 /* NOTE: This function increments the refcount of the associated card like
0023  * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
0024  */
0025 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
0026 {
0027     struct snd_minor *mreg;
0028     void *private_data;
0029 
0030     if (minor >= ARRAY_SIZE(snd_oss_minors))
0031         return NULL;
0032     mutex_lock(&sound_oss_mutex);
0033     mreg = snd_oss_minors[minor];
0034     if (mreg && mreg->type == type) {
0035         private_data = mreg->private_data;
0036         if (private_data && mreg->card_ptr)
0037             get_device(&mreg->card_ptr->card_dev);
0038     } else
0039         private_data = NULL;
0040     mutex_unlock(&sound_oss_mutex);
0041     return private_data;
0042 }
0043 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
0044 
0045 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
0046 {
0047     int minor;
0048 
0049     switch (type) {
0050     case SNDRV_OSS_DEVICE_TYPE_MIXER:
0051         if (snd_BUG_ON(!card || dev < 0 || dev > 1))
0052             return -EINVAL;
0053         minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
0054         break;
0055     case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
0056         minor = SNDRV_MINOR_OSS_SEQUENCER;
0057         break;
0058     case SNDRV_OSS_DEVICE_TYPE_MUSIC:
0059         minor = SNDRV_MINOR_OSS_MUSIC;
0060         break;
0061     case SNDRV_OSS_DEVICE_TYPE_PCM:
0062         if (snd_BUG_ON(!card || dev < 0 || dev > 1))
0063             return -EINVAL;
0064         minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
0065         break;
0066     case SNDRV_OSS_DEVICE_TYPE_MIDI:
0067         if (snd_BUG_ON(!card || dev < 0 || dev > 1))
0068             return -EINVAL;
0069         minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
0070         break;
0071     case SNDRV_OSS_DEVICE_TYPE_DMFM:
0072         minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
0073         break;
0074     case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
0075         minor = SNDRV_MINOR_OSS_SNDSTAT;
0076         break;
0077     default:
0078         return -EINVAL;
0079     }
0080     if (minor < 0 || minor >= SNDRV_OSS_MINORS)
0081         return -EINVAL;
0082     return minor;
0083 }
0084 
0085 int snd_register_oss_device(int type, struct snd_card *card, int dev,
0086                 const struct file_operations *f_ops, void *private_data)
0087 {
0088     int minor = snd_oss_kernel_minor(type, card, dev);
0089     int minor_unit;
0090     struct snd_minor *preg;
0091     int cidx = SNDRV_MINOR_OSS_CARD(minor);
0092     int track2 = -1;
0093     int register1 = -1, register2 = -1;
0094     struct device *carddev = snd_card_get_device_link(card);
0095 
0096     if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
0097         return 0; /* ignore silently */
0098     if (minor < 0)
0099         return minor;
0100     preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
0101     if (preg == NULL)
0102         return -ENOMEM;
0103     preg->type = type;
0104     preg->card = card ? card->number : -1;
0105     preg->device = dev;
0106     preg->f_ops = f_ops;
0107     preg->private_data = private_data;
0108     preg->card_ptr = card;
0109     mutex_lock(&sound_oss_mutex);
0110     snd_oss_minors[minor] = preg;
0111     minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
0112     switch (minor_unit) {
0113     case SNDRV_MINOR_OSS_PCM:
0114         track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
0115         break;
0116     case SNDRV_MINOR_OSS_MIDI:
0117         track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
0118         break;
0119     case SNDRV_MINOR_OSS_MIDI1:
0120         track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
0121         break;
0122     }
0123     register1 = register_sound_special_device(f_ops, minor, carddev);
0124     if (register1 != minor)
0125         goto __end;
0126     if (track2 >= 0) {
0127         register2 = register_sound_special_device(f_ops, track2,
0128                               carddev);
0129         if (register2 != track2)
0130             goto __end;
0131         snd_oss_minors[track2] = preg;
0132     }
0133     mutex_unlock(&sound_oss_mutex);
0134     return 0;
0135 
0136       __end:
0137         if (register2 >= 0)
0138             unregister_sound_special(register2);
0139         if (register1 >= 0)
0140             unregister_sound_special(register1);
0141     snd_oss_minors[minor] = NULL;
0142     mutex_unlock(&sound_oss_mutex);
0143     kfree(preg);
0144         return -EBUSY;
0145 }
0146 EXPORT_SYMBOL(snd_register_oss_device);
0147 
0148 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
0149 {
0150     int minor = snd_oss_kernel_minor(type, card, dev);
0151     int cidx = SNDRV_MINOR_OSS_CARD(minor);
0152     int track2 = -1;
0153     struct snd_minor *mptr;
0154 
0155     if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
0156         return 0;
0157     if (minor < 0)
0158         return minor;
0159     mutex_lock(&sound_oss_mutex);
0160     mptr = snd_oss_minors[minor];
0161     if (mptr == NULL) {
0162         mutex_unlock(&sound_oss_mutex);
0163         return -ENOENT;
0164     }
0165     unregister_sound_special(minor);
0166     switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
0167     case SNDRV_MINOR_OSS_PCM:
0168         track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
0169         break;
0170     case SNDRV_MINOR_OSS_MIDI:
0171         track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
0172         break;
0173     case SNDRV_MINOR_OSS_MIDI1:
0174         track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
0175         break;
0176     }
0177     if (track2 >= 0) {
0178         unregister_sound_special(track2);
0179         snd_oss_minors[track2] = NULL;
0180     }
0181     snd_oss_minors[minor] = NULL;
0182     mutex_unlock(&sound_oss_mutex);
0183     kfree(mptr);
0184     return 0;
0185 }
0186 EXPORT_SYMBOL(snd_unregister_oss_device);
0187 
0188 /*
0189  *  INFO PART
0190  */
0191 
0192 #ifdef CONFIG_SND_PROC_FS
0193 static const char *snd_oss_device_type_name(int type)
0194 {
0195     switch (type) {
0196     case SNDRV_OSS_DEVICE_TYPE_MIXER:
0197         return "mixer";
0198     case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
0199     case SNDRV_OSS_DEVICE_TYPE_MUSIC:
0200         return "sequencer";
0201     case SNDRV_OSS_DEVICE_TYPE_PCM:
0202         return "digital audio";
0203     case SNDRV_OSS_DEVICE_TYPE_MIDI:
0204         return "raw midi";
0205     case SNDRV_OSS_DEVICE_TYPE_DMFM:
0206         return "hardware dependent";
0207     default:
0208         return "?";
0209     }
0210 }
0211 
0212 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
0213                     struct snd_info_buffer *buffer)
0214 {
0215     int minor;
0216     struct snd_minor *mptr;
0217 
0218     mutex_lock(&sound_oss_mutex);
0219     for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
0220         mptr = snd_oss_minors[minor];
0221         if (!mptr)
0222             continue;
0223         if (mptr->card >= 0)
0224             snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
0225                     mptr->card, mptr->device,
0226                     snd_oss_device_type_name(mptr->type));
0227         else
0228             snd_iprintf(buffer, "%3i:       : %s\n", minor,
0229                     snd_oss_device_type_name(mptr->type));
0230     }
0231     mutex_unlock(&sound_oss_mutex);
0232 }
0233 
0234 
0235 int __init snd_minor_info_oss_init(void)
0236 {
0237     struct snd_info_entry *entry;
0238 
0239     entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
0240     if (!entry)
0241         return -ENOMEM;
0242     entry->c.text.read = snd_minor_info_oss_read;
0243     return snd_info_register(entry); /* freed in error path */
0244 }
0245 #endif /* CONFIG_SND_PROC_FS */
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