emux_hwdep.c

  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->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 */
 51static int
 52snd_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 */
 79static int
 80snd_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
114int
115snd_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	strscpy(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 */
143void
144snd_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}