sound/core/seq/seq_compat.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   32bit -> 64bit ioctl wrapper for sequencer API
   4  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5  */
   6
   7 /* This file included from seq.c */
   8
   9 #include <linux/compat.h>
  10 #include <linux/slab.h>
  11
  12 struct snd_seq_port_info32 {
  13         struct snd_seq_addr addr;       /* client/port numbers */
  14         char name[64];                  /* port name */
  15
  16         u32 capability; /* port capability bits */
  17         u32 type;               /* port type bits */
  18         s32 midi_channels;              /* channels per MIDI port */
  19         s32 midi_voices;                /* voices per MIDI port */
  20         s32 synth_voices;               /* voices per SYNTH port */
  21
  22         s32 read_use;                   /* R/O: subscribers for output (from this port) */
  23         s32 write_use;                  /* R/O: subscribers for input (to this port) */
  24
  25         u32 kernel;                     /* reserved for kernel use (must be NULL) */
  26         u32 flags;              /* misc. conditioning */
  27         unsigned char time_queue;       /* queue # for timestamping */
  28         char reserved[59];              /* for future use */
  29 };
  30
  31 static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned int cmd,
  32                                         struct snd_seq_port_info32 __user *data32)
  33 {
  34         int err = -EFAULT;
  35         struct snd_seq_port_info *data;
  36
  37         data = kmalloc(sizeof(*data), GFP_KERNEL);
  38         if (!data)
  39                 return -ENOMEM;
  40
  41         if (copy_from_user(data, data32, sizeof(*data32)) ||
  42             get_user(data->flags, &data32->flags) ||
  43             get_user(data->time_queue, &data32->time_queue))
  44                 goto error;
  45         data->kernel = NULL;
  46
  47         err = snd_seq_kernel_client_ctl(client->number, cmd, data);
  48         if (err < 0)
  49                 goto error;
  50
  51         if (copy_to_user(data32, data, sizeof(*data32)) ||
  52             put_user(data->flags, &data32->flags) ||
  53             put_user(data->time_queue, &data32->time_queue))
  54                 err = -EFAULT;
  55
  56  error:
  57         kfree(data);
  58         return err;
  59 }
  60
  61
  62
  63 /*
  64  */
  65
  66 enum {
  67         SNDRV_SEQ_IOCTL_CREATE_PORT32 = _IOWR('S', 0x20, struct snd_seq_port_info32),
  68         SNDRV_SEQ_IOCTL_DELETE_PORT32 = _IOW ('S', 0x21, struct snd_seq_port_info32),
  69         SNDRV_SEQ_IOCTL_GET_PORT_INFO32 = _IOWR('S', 0x22, struct snd_seq_port_info32),
  70         SNDRV_SEQ_IOCTL_SET_PORT_INFO32 = _IOW ('S', 0x23, struct snd_seq_port_info32),
  71         SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT32 = _IOWR('S', 0x52, struct snd_seq_port_info32),
  72 };
  73
  74 static long snd_seq_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
  75 {
  76         struct snd_seq_client *client = file->private_data;
  77         void __user *argp = compat_ptr(arg);
  78
  79         if (snd_BUG_ON(!client))
  80                 return -ENXIO;
  81
  82         switch (cmd) {
  83         case SNDRV_SEQ_IOCTL_PVERSION:
  84         case SNDRV_SEQ_IOCTL_CLIENT_ID:
  85         case SNDRV_SEQ_IOCTL_SYSTEM_INFO:
  86         case SNDRV_SEQ_IOCTL_GET_CLIENT_INFO:
  87         case SNDRV_SEQ_IOCTL_SET_CLIENT_INFO:
  88         case SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT:
  89         case SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT:
  90         case SNDRV_SEQ_IOCTL_CREATE_QUEUE:
  91         case SNDRV_SEQ_IOCTL_DELETE_QUEUE:
  92         case SNDRV_SEQ_IOCTL_GET_QUEUE_INFO:
  93         case SNDRV_SEQ_IOCTL_SET_QUEUE_INFO:
  94         case SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE:
  95         case SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS:
  96         case SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO:
  97         case SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO:
  98         case SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER:
  99         case SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER:
 100         case SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT:
 101         case SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT:
 102         case SNDRV_SEQ_IOCTL_GET_CLIENT_POOL:
 103         case SNDRV_SEQ_IOCTL_SET_CLIENT_POOL:
 104         case SNDRV_SEQ_IOCTL_REMOVE_EVENTS:
 105         case SNDRV_SEQ_IOCTL_QUERY_SUBS:
 106         case SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION:
 107         case SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT:
 108         case SNDRV_SEQ_IOCTL_RUNNING_MODE:
 109                 return snd_seq_ioctl(file, cmd, arg);
 110         case SNDRV_SEQ_IOCTL_CREATE_PORT32:
 111                 return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_CREATE_PORT, argp);
 112         case SNDRV_SEQ_IOCTL_DELETE_PORT32:
 113                 return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_DELETE_PORT, argp);
 114         case SNDRV_SEQ_IOCTL_GET_PORT_INFO32:
 115                 return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_GET_PORT_INFO, argp);
 116         case SNDRV_SEQ_IOCTL_SET_PORT_INFO32:
 117                 return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_SET_PORT_INFO, argp);
 118         case SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT32:
 119                 return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, argp);
 120         }
 121         return -ENOIOCTLCMD;
 122 }