LXR linux/sound/synth/emux/emux

   1/*
   2 *  Interface for hwdep device
   3 *
   4 *  Copyright (C) 2004 Takashi Iwai <tiwai@suse.de>
   5 *
   6 *   This program is free software; you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation; either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 *
  16 *   You should have received a copy of the GNU General Public License
  17 *   along with this program; if not, write to the Free Software
  18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 *
  20 */
  21
  22#include <sound/core.h>
  23#include <sound/hwdep.h>
  24#include <linux/uaccess.h>
  25#include <linux/nospec.h>
  26#include "emux_voice.h"
  27
  28#define TMP_CLIENT_ID   0x1001
  29
  30/*
  31 * load patch
  32 */
  33static int
  34snd_emux_hwdep_load_patch(struct snd_emux *emu, void __user *arg)
  35{
  36        int err;
  37        struct soundfont_patch_info patch;
  38
  39        if (copy_from_user(&patch, arg, sizeof(patch)))
  40                return -EFAULT;
  41
  42        if (patch.type >= SNDRV_SFNT_LOAD_INFO &&
  43            patch.type <= SNDRV_SFNT_PROBE_DATA) {
  44                err = snd_soundfont_load(emu->sflist, arg, patch.len + sizeof(patch), TMP_CLIENT_ID);
  45                if (err < 0)
  46                        return err;
  47        } else {
  48                if (emu->ops.load_fx)
  49                        return emu->ops.load_fx(emu, patch.type, patch.optarg, arg, patch.len + sizeof(patch));
  50                else
  51                        return -EINVAL;
  52        }
  53        return 0;
  54}
  55
  56/*
  57 * set misc mode
  58 */
  59static int
  60snd_emux_hwdep_misc_mode(struct snd_emux *emu, void __user *arg)
  61{
  62        struct snd_emux_misc_mode info;
  63        int i;
  64
  65        if (copy_from_user(&info, arg, sizeof(info)))
  66                return -EFAULT;
  67        if (info.mode < 0 || info.mode >= EMUX_MD_END)
  68                return -EINVAL;
  69        info.mode = array_index_nospec(info.mode, EMUX_MD_END);
  70
  71        if (info.port < 0) {
  72                for (i = 0; i < emu->num_ports; i++)
  73                        emu->portptrs[i]->ctrls[info.mode] = info.value;
  74        } else {
  75                if (info.port < emu->num_ports) {
  76                        info.port = array_index_nospec(info.port, emu->num_ports);
  77                        emu->portptrs[info.port]->ctrls[info.mode] = info.value;
  78                }
  79        }
  80        return 0;
  81}
  82
  83
  84/*
  85 * ioctl
  86 */
  87static int
  88snd_emux_hwdep_ioctl(struct snd_hwdep * hw, struct file *file,
  89                     unsigned int cmd, unsigned long arg)
  90{
  91        struct snd_emux *emu = hw->private_data;
  92
  93        switch (cmd) {
  94        case SNDRV_EMUX_IOCTL_VERSION:
  95                return put_user(SNDRV_EMUX_VERSION, (unsigned int __user *)arg);
  96        case SNDRV_EMUX_IOCTL_LOAD_PATCH:
  97                return snd_emux_hwdep_load_patch(emu, (void __user *)arg);
  98        case SNDRV_EMUX_IOCTL_RESET_SAMPLES:
  99                snd_soundfont_remove_samples(emu->sflist);
 100                break;
 101        case SNDRV_EMUX_IOCTL_REMOVE_LAST_SAMPLES:
 102                snd_soundfont_remove_unlocked(emu->sflist);
 103                break;
 104        case SNDRV_EMUX_IOCTL_MEM_AVAIL:
 105                if (emu->memhdr) {
 106                        int size = snd_util_mem_avail(emu->memhdr);
 107                        return put_user(size, (unsigned int __user *)arg);
 108                }
 109                break;
 110        case SNDRV_EMUX_IOCTL_MISC_MODE:
 111                return snd_emux_hwdep_misc_mode(emu, (void __user *)arg);
 112        }
 113
 114        return 0;
 115}
 116
 117
 118/*
 119 * register hwdep device
 120 */
 121
 122int
 123snd_emux_init_hwdep(struct snd_emux *emu)
 124{
 125        struct snd_hwdep *hw;
 126        int err;
 127
 128        if ((err = snd_hwdep_new(emu->card, SNDRV_EMUX_HWDEP_NAME, emu->hwdep_idx, &hw)) < 0)
 129                return err;
 130        emu->hwdep = hw;
 131        strcpy(hw->name, SNDRV_EMUX_HWDEP_NAME);
 132        hw->iface = SNDRV_HWDEP_IFACE_EMUX_WAVETABLE;
 133        hw->ops.ioctl = snd_emux_hwdep_ioctl;
 134        /* The ioctl parameter types are compatible between 32- and
 135         * 64-bit architectures, so use the same function. */
 136        hw->ops.ioctl_compat = snd_emux_hwdep_ioctl;
 137        hw->exclusive = 1;
 138        hw->private_data = emu;
 139        if ((err = snd_card_register(emu->card)) < 0)
 140                return err;
 141
 142        return 0;
 143}
 144
 145
 146/*
 147 * unregister
 148 */
 149void
 150snd_emux_delete_hwdep(struct snd_emux *emu)
 151{
 152        if (emu->hwdep) {
 153                snd_device_free(emu->card, emu->hwdep);
 154                emu->hwdep = NULL;
 155        }
 156}
 157