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 */
19static int
20snd_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(to: &patch, from: arg, n: sizeof(patch)))
26 return -EFAULT;
27
28 if (patch.key == GUS_PATCH)
29 return snd_soundfont_load_guspatch(card: emu->card, sflist: emu->sflist, data: arg,
30 count: 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(card: emu->card, sflist: emu->sflist, data: arg,
35 count: 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 else
43 return -EINVAL;
44 }
45 return 0;
46}
47
48/*
49 * set misc mode
50 */
51static int
52snd_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(to: &info, from: arg, n: 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 * ioctl
78 */
79static int
80snd_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, arg: (void __user *)arg);
90 case SNDRV_EMUX_IOCTL_RESET_SAMPLES:
91 snd_soundfont_remove_samples(sflist: emu->sflist);
92 break;
93 case SNDRV_EMUX_IOCTL_REMOVE_LAST_SAMPLES:
94 snd_soundfont_remove_unlocked(sflist: emu->sflist);
95 break;
96 case SNDRV_EMUX_IOCTL_MEM_AVAIL:
97 if (emu->memhdr) {
98 int size = snd_util_mem_avail(hdr: 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, arg: (void __user *)arg);
104 }
105
106 return 0;
107}
108
109
110/*
111 * register hwdep device
112 */
113
114int
115snd_emux_init_hwdep(struct snd_emux *emu)
116{
117 struct snd_hwdep *hw;
118 int err;
119
120 err = snd_hwdep_new(card: emu->card, SNDRV_EMUX_HWDEP_NAME, device: emu->hwdep_idx, rhwdep: &hw);
121 if (err < 0)
122 return err;
123 emu->hwdep = hw;
124 strscpy(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- and
128 * 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(card: emu->card);
133 if (err < 0)
134 return err;
135
136 return 0;
137}
138
139
140/*
141 * unregister
142 */
143void
144snd_emux_delete_hwdep(struct snd_emux *emu)
145{
146 if (emu->hwdep) {
147 snd_device_free(card: emu->card, device_data: emu->hwdep);
148 emu->hwdep = NULL;
149 }
150}
151

source code of linux/sound/synth/emux/emux_hwdep.c