xref: /openbmc/linux/sound/synth/emux/emux_hwdep.c (revision dd1fc3c5)
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