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->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 else
43 return -EINVAL;
44 }
45 return 0;
46 }
47
48 /*
49 * set misc mode
50 */
51 static int
snd_emux_hwdep_misc_mode(struct snd_emux * emu,void __user * arg)52 snd_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 * ioctl
78 */
79 static int
snd_emux_hwdep_ioctl(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)80 snd_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 device
112 */
113
114 int
snd_emux_init_hwdep(struct snd_emux * emu)115 snd_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- 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(emu->card);
133 if (err < 0)
134 return err;
135
136 return 0;
137 }
138
139
140 /*
141 * unregister
142 */
143 void
snd_emux_delete_hwdep(struct snd_emux * emu)144 snd_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