1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Interface for hwdep device 4 * 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 0x1001 15 16 /* 17 * load patch 18 */ 19 static int 20 snd_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->sflist, arg, 30 patch.len + sizeof(patch), 31 TMP_CLIENT_ID); 32 33 if (patch.type >= SNDRV_SFNT_LOAD_INFO && 34 patch.type <= SNDRV_SFNT_PROBE_DATA) { 35 err = snd_soundfont_load(emu->sflist, arg, patch.len + sizeof(patch), TMP_CLIENT_ID); 36 if (err < 0) 37 return err; 38 } else { 39 if (emu->ops.load_fx) 40 return emu->ops.load_fx(emu, patch.type, patch.optarg, arg, patch.len + sizeof(patch)); 41 else 42 return -EINVAL; 43 } 44 return 0; 45 } 46 47 /* 48 * set misc mode 49 */ 50 static int 51 snd_emux_hwdep_misc_mode(struct snd_emux *emu, void __user *arg) 52 { 53 struct snd_emux_misc_mode info; 54 int i; 55 56 if (copy_from_user(&info, arg, sizeof(info))) 57 return -EFAULT; 58 if (info.mode < 0 || info.mode >= EMUX_MD_END) 59 return -EINVAL; 60 info.mode = array_index_nospec(info.mode, EMUX_MD_END); 61 62 if (info.port < 0) { 63 for (i = 0; i < emu->num_ports; i++) 64 emu->portptrs[i]->ctrls[info.mode] = info.value; 65 } else { 66 if (info.port < emu->num_ports) { 67 info.port = array_index_nospec(info.port, emu->num_ports); 68 emu->portptrs[info.port]->ctrls[info.mode] = info.value; 69 } 70 } 71 return 0; 72 } 73 74 75 /* 76 * ioctl 77 */ 78 static int 79 snd_emux_hwdep_ioctl(struct snd_hwdep * hw, struct file *file, 80 unsigned int cmd, unsigned long arg) 81 { 82 struct snd_emux *emu = hw->private_data; 83 84 switch (cmd) { 85 case SNDRV_EMUX_IOCTL_VERSION: 86 return put_user(SNDRV_EMUX_VERSION, (unsigned int __user *)arg); 87 case SNDRV_EMUX_IOCTL_LOAD_PATCH: 88 return snd_emux_hwdep_load_patch(emu, (void __user *)arg); 89 case SNDRV_EMUX_IOCTL_RESET_SAMPLES: 90 snd_soundfont_remove_samples(emu->sflist); 91 break; 92 case SNDRV_EMUX_IOCTL_REMOVE_LAST_SAMPLES: 93 snd_soundfont_remove_unlocked(emu->sflist); 94 break; 95 case SNDRV_EMUX_IOCTL_MEM_AVAIL: 96 if (emu->memhdr) { 97 int size = snd_util_mem_avail(emu->memhdr); 98 return put_user(size, (unsigned int __user *)arg); 99 } 100 break; 101 case SNDRV_EMUX_IOCTL_MISC_MODE: 102 return snd_emux_hwdep_misc_mode(emu, (void __user *)arg); 103 } 104 105 return 0; 106 } 107 108 109 /* 110 * register hwdep device 111 */ 112 113 int 114 snd_emux_init_hwdep(struct snd_emux *emu) 115 { 116 struct snd_hwdep *hw; 117 int err; 118 119 if ((err = snd_hwdep_new(emu->card, SNDRV_EMUX_HWDEP_NAME, emu->hwdep_idx, &hw)) < 0) 120 return err; 121 emu->hwdep = hw; 122 strcpy(hw->name, SNDRV_EMUX_HWDEP_NAME); 123 hw->iface = SNDRV_HWDEP_IFACE_EMUX_WAVETABLE; 124 hw->ops.ioctl = snd_emux_hwdep_ioctl; 125 /* The ioctl parameter types are compatible between 32- and 126 * 64-bit architectures, so use the same function. */ 127 hw->ops.ioctl_compat = snd_emux_hwdep_ioctl; 128 hw->exclusive = 1; 129 hw->private_data = emu; 130 if ((err = snd_card_register(emu->card)) < 0) 131 return err; 132 133 return 0; 134 } 135 136 137 /* 138 * unregister 139 */ 140 void 141 snd_emux_delete_hwdep(struct snd_emux *emu) 142 { 143 if (emu->hwdep) { 144 snd_device_free(emu->card, emu->hwdep); 145 emu->hwdep = NULL; 146 } 147 } 148