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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Interface for hwdep device4 *5 * Copyright (C) 2004 Takashi Iwai <tiwai@suse.de>6 */7 8#include <sound/core.h>9#include <sound/hwdep.h>10#include <linux/uaccess.h>11#include <linux/nospec.h>12#include "emux_voice.h"13 14#define TMP_CLIENT_ID 0x100115 16/*17 * load patch18 */19static int20snd_emux_hwdep_load_patch(struct snd_emux *emu, void __user *arg)21{22 int err;23 struct soundfont_patch_info patch;24 25 if (copy_from_user(&patch, arg, sizeof(patch)))26 return -EFAULT;27 28 if (patch.key == GUS_PATCH)29 return snd_soundfont_load_guspatch(emu->card, emu->sflist, arg,30 patch.len + sizeof(patch));31 32 if (patch.type >= SNDRV_SFNT_LOAD_INFO &&33 patch.type <= SNDRV_SFNT_PROBE_DATA) {34 err = snd_soundfont_load(emu->card, emu->sflist, arg,35 patch.len + sizeof(patch),36 TMP_CLIENT_ID);37 if (err < 0)38 return err;39 } else {40 if (emu->ops.load_fx)41 return emu->ops.load_fx(emu, patch.type, patch.optarg, arg, patch.len + sizeof(patch));42 else43 return -EINVAL;44 }45 return 0;46}47 48/*49 * set misc mode50 */51static int52snd_emux_hwdep_misc_mode(struct snd_emux *emu, void __user *arg)53{54 struct snd_emux_misc_mode info;55 int i;56 57 if (copy_from_user(&info, arg, sizeof(info)))58 return -EFAULT;59 if (info.mode < 0 || info.mode >= EMUX_MD_END)60 return -EINVAL;61 info.mode = array_index_nospec(info.mode, EMUX_MD_END);62 63 if (info.port < 0) {64 for (i = 0; i < emu->num_ports; i++)65 emu->portptrs[i]->ctrls[info.mode] = info.value;66 } else {67 if (info.port < emu->num_ports) {68 info.port = array_index_nospec(info.port, emu->num_ports);69 emu->portptrs[info.port]->ctrls[info.mode] = info.value;70 }71 }72 return 0;73}74 75 76/*77 * ioctl78 */79static int80snd_emux_hwdep_ioctl(struct snd_hwdep * hw, struct file *file,81 unsigned int cmd, unsigned long arg)82{83 struct snd_emux *emu = hw->private_data;84 85 switch (cmd) {86 case SNDRV_EMUX_IOCTL_VERSION:87 return put_user(SNDRV_EMUX_VERSION, (unsigned int __user *)arg);88 case SNDRV_EMUX_IOCTL_LOAD_PATCH:89 return snd_emux_hwdep_load_patch(emu, (void __user *)arg);90 case SNDRV_EMUX_IOCTL_RESET_SAMPLES:91 snd_soundfont_remove_samples(emu->sflist);92 break;93 case SNDRV_EMUX_IOCTL_REMOVE_LAST_SAMPLES:94 snd_soundfont_remove_unlocked(emu->sflist);95 break;96 case SNDRV_EMUX_IOCTL_MEM_AVAIL:97 if (emu->memhdr) {98 int size = snd_util_mem_avail(emu->memhdr);99 return put_user(size, (unsigned int __user *)arg);100 }101 break;102 case SNDRV_EMUX_IOCTL_MISC_MODE:103 return snd_emux_hwdep_misc_mode(emu, (void __user *)arg);104 }105 106 return 0;107}108 109 110/*111 * register hwdep device112 */113 114int115snd_emux_init_hwdep(struct snd_emux *emu)116{117 struct snd_hwdep *hw;118 int err;119 120 err = snd_hwdep_new(emu->card, SNDRV_EMUX_HWDEP_NAME, emu->hwdep_idx, &hw);121 if (err < 0)122 return err;123 emu->hwdep = hw;124 strcpy(hw->name, SNDRV_EMUX_HWDEP_NAME);125 hw->iface = SNDRV_HWDEP_IFACE_EMUX_WAVETABLE;126 hw->ops.ioctl = snd_emux_hwdep_ioctl;127 /* The ioctl parameter types are compatible between 32- and128 * 64-bit architectures, so use the same function. */129 hw->ops.ioctl_compat = snd_emux_hwdep_ioctl;130 hw->exclusive = 1;131 hw->private_data = emu;132 err = snd_card_register(emu->card);133 if (err < 0)134 return err;135 136 return 0;137}138 139 140/*141 * unregister142 */143void144snd_emux_delete_hwdep(struct snd_emux *emu)145{146 if (emu->hwdep) {147 snd_device_free(emu->card, emu->hwdep);148 emu->hwdep = NULL;149 }150}151