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(&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 */
50static int
51snd_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 */
78static int
79snd_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
113int
114snd_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 */
142void
143snd_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