cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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emux_hwdep.c (3342B)

      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}