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
32 if (patch.type >= SNDRV_SFNT_LOAD_INFO &&
33 patch.type <= SNDRV_SFNT_PROBE_DATA) {
34 err = snd_soundfont_load(emu->sflist, arg, patch.len + sizeof(patch), TMP_CLIENT_ID);
35 if (err < 0)
36 return err;
37 } else {
38 if (emu->ops.load_fx)
39 return emu->ops.load_fx(emu, patch.type, patch.optarg, arg, patch.len + sizeof(patch));
40 else
41 return -EINVAL;
42 }
43 return 0;
44 }
45
46 /*
47 * set misc mode
48 */
49 static int
50 snd_emux_hwdep_misc_mode(struct snd_emux *emu, void __user *arg)
51 {
52 struct snd_emux_misc_mode info;
53 int i;
54
55 if (copy_from_user(&info, arg, sizeof(info)))
56 return -EFAULT;
57 if (info.mode < 0 || info.mode >= EMUX_MD_END)
58 return -EINVAL;
59 info.mode = array_index_nospec(info.mode, EMUX_MD_END);
60
61 if (info.port < 0) {
62 for (i = 0; i < emu->num_ports; i++)
63 emu->portptrs[i]->ctrls[info.mode] = info.value;
64 } else {
65 if (info.port < emu->num_ports) {
66 info.port = array_index_nospec(info.port, emu->num_ports);
67 emu->portptrs[info.port]->ctrls[info.mode] = info.value;
68 }
69 }
70 return 0;
71 }
72
73
74 /*
75 * ioctl
76 */
77 static int
78 snd_emux_hwdep_ioctl(struct snd_hwdep * hw, struct file *file,
79 unsigned int cmd, unsigned long arg)
80 {
81 struct snd_emux *emu = hw->private_data;
82
83 switch (cmd) {
84 case SNDRV_EMUX_IOCTL_VERSION:
85 return put_user(SNDRV_EMUX_VERSION, (unsigned int __user *)arg);
86 case SNDRV_EMUX_IOCTL_LOAD_PATCH:
87 return snd_emux_hwdep_load_patch(emu, (void __user *)arg);
88 case SNDRV_EMUX_IOCTL_RESET_SAMPLES:
89 snd_soundfont_remove_samples(emu->sflist);
90 break;
91 case SNDRV_EMUX_IOCTL_REMOVE_LAST_SAMPLES:
92 snd_soundfont_remove_unlocked(emu->sflist);
93 break;
94 case SNDRV_EMUX_IOCTL_MEM_AVAIL:
95 if (emu->memhdr) {
96 int size = snd_util_mem_avail(emu->memhdr);
97 return put_user(size, (unsigned int __user *)arg);
98 }
99 break;
100 case SNDRV_EMUX_IOCTL_MISC_MODE:
101 return snd_emux_hwdep_misc_mode(emu, (void __user *)arg);
102 }
103
104 return 0;
105 }
106
107
108 /*
109 * register hwdep device
110 */
111
112 int
113 snd_emux_init_hwdep(struct snd_emux *emu)
114 {
115 struct snd_hwdep *hw;
116 int err;
117
118 err = snd_hwdep_new(emu->card, SNDRV_EMUX_HWDEP_NAME, emu->hwdep_idx, &hw);
119 if (err < 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 err = snd_card_register(emu->card);
131 if (err < 0)
132 return err;
133
134 return 0;
135 }
136
137
138 /*
139 * unregister
140 */
141 void
142 snd_emux_delete_hwdep(struct snd_emux *emu)
143 {
144 if (emu->hwdep) {
145 snd_device_free(emu->card, emu->hwdep);
146 emu->hwdep = NULL;
147 }
148 }
149
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