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
snd_emux_hwdep_load_patch(struct snd_emux * emu,void __user * arg)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
snd_emux_hwdep_misc_mode(struct snd_emux * emu,void __user * arg)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
snd_emux_hwdep_ioctl(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)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
snd_emux_init_hwdep(struct snd_emux * emu)114 snd_emux_init_hwdep(struct snd_emux *emu)
115 {
116 struct snd_hwdep *hw;
117 int err;
118
119 err = snd_hwdep_new(emu->card, SNDRV_EMUX_HWDEP_NAME, emu->hwdep_idx, &hw);
120 if (err < 0)
121 return err;
122 emu->hwdep = hw;
123 strcpy(hw->name, SNDRV_EMUX_HWDEP_NAME);
124 hw->iface = SNDRV_HWDEP_IFACE_EMUX_WAVETABLE;
125 hw->ops.ioctl = snd_emux_hwdep_ioctl;
126 /* The ioctl parameter types are compatible between 32- and
127 * 64-bit architectures, so use the same function. */
128 hw->ops.ioctl_compat = snd_emux_hwdep_ioctl;
129 hw->exclusive = 1;
130 hw->private_data = emu;
131 err = snd_card_register(emu->card);
132 if (err < 0)
133 return err;
134
135 return 0;
136 }
137
138
139 /*
140 * unregister
141 */
142 void
snd_emux_delete_hwdep(struct snd_emux * emu)143 snd_emux_delete_hwdep(struct snd_emux *emu)
144 {
145 if (emu->hwdep) {
146 snd_device_free(emu->card, emu->hwdep);
147 emu->hwdep = NULL;
148 }
149 }
150