1 files changed, 124 insertions, 0 deletions
diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c
new file mode 100644
index 000000000..0103d16f6
--- /dev/null
+++ b/sound/core/timer_compat.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   32bit -> 64bit ioctl wrapper for timer API
+ *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
+ */
+
+/* This file included from timer.c */
+
+#include <linux/compat.h>
+
+/*
+ * ILP32/LP64 has different size for 'long' type. Additionally, the size
+ * of storage alignment differs depending on architectures. Here, '__packed'
+ * qualifier is used so that the size of this structure is multiple of 4 and
+ * it fits to any architectures with 32 bit storage alignment.
+ */
+struct snd_timer_gparams32 {
+	struct snd_timer_id tid;
+	u32 period_num;
+	u32 period_den;
+	unsigned char reserved[32];
+} __packed;
+
+struct snd_timer_info32 {
+	u32 flags;
+	s32 card;
+	unsigned char id[64];
+	unsigned char name[80];
+	u32 reserved0;
+	u32 resolution;
+	unsigned char reserved[64];
+};
+
+static int snd_timer_user_gparams_compat(struct file *file,
+					struct snd_timer_gparams32 __user *user)
+{
+	struct snd_timer_gparams gparams;
+
+	if (copy_from_user(&gparams.tid, &user->tid, sizeof(gparams.tid)) ||
+	    get_user(gparams.period_num, &user->period_num) ||
+	    get_user(gparams.period_den, &user->period_den))
+		return -EFAULT;
+
+	return timer_set_gparams(&gparams);
+}
+
+static int snd_timer_user_info_compat(struct file *file,
+				      struct snd_timer_info32 __user *_info)
+{
+	struct snd_timer_user *tu;
+	struct snd_timer_info32 info;
+	struct snd_timer *t;
+
+	tu = file->private_data;
+	if (!tu->timeri)
+		return -EBADFD;
+	t = tu->timeri->timer;
+	if (!t)
+		return -EBADFD;
+	memset(&info, 0, sizeof(info));
+	info.card = t->card ? t->card->number : -1;
+	if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
+		info.flags |= SNDRV_TIMER_FLG_SLAVE;
+	strlcpy(info.id, t->id, sizeof(info.id));
+	strlcpy(info.name, t->name, sizeof(info.name));
+	info.resolution = t->hw.resolution;
+	if (copy_to_user(_info, &info, sizeof(*_info)))
+		return -EFAULT;
+	return 0;
+}
+
+enum {
+	SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
+	SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
+	SNDRV_TIMER_IOCTL_STATUS_COMPAT32 = _IOW('T', 0x14, struct snd_timer_status32),
+	SNDRV_TIMER_IOCTL_STATUS_COMPAT64 = _IOW('T', 0x14, struct snd_timer_status64),
+};
+
+static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
+					  unsigned long arg)
+{
+	void __user *argp = compat_ptr(arg);
+
+	switch (cmd) {
+	case SNDRV_TIMER_IOCTL_PVERSION:
+	case SNDRV_TIMER_IOCTL_TREAD_OLD:
+	case SNDRV_TIMER_IOCTL_TREAD64:
+	case SNDRV_TIMER_IOCTL_GINFO:
+	case SNDRV_TIMER_IOCTL_GSTATUS:
+	case SNDRV_TIMER_IOCTL_SELECT:
+	case SNDRV_TIMER_IOCTL_PARAMS:
+	case SNDRV_TIMER_IOCTL_START:
+	case SNDRV_TIMER_IOCTL_START_OLD:
+	case SNDRV_TIMER_IOCTL_STOP:
+	case SNDRV_TIMER_IOCTL_STOP_OLD:
+	case SNDRV_TIMER_IOCTL_CONTINUE:
+	case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
+	case SNDRV_TIMER_IOCTL_PAUSE:
+	case SNDRV_TIMER_IOCTL_PAUSE_OLD:
+	case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
+		return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp, true);
+	case SNDRV_TIMER_IOCTL_GPARAMS32:
+		return snd_timer_user_gparams_compat(file, argp);
+	case SNDRV_TIMER_IOCTL_INFO32:
+		return snd_timer_user_info_compat(file, argp);
+	case SNDRV_TIMER_IOCTL_STATUS_COMPAT32:
+		return snd_timer_user_status32(file, argp);
+	case SNDRV_TIMER_IOCTL_STATUS_COMPAT64:
+		return snd_timer_user_status64(file, argp);
+	}
+	return -ENOIOCTLCMD;
+}
+
+static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
+					unsigned long arg)
+{
+	struct snd_timer_user *tu = file->private_data;
+	long ret;
+
+	mutex_lock(&tu->ioctl_lock);
+	ret = __snd_timer_user_ioctl_compat(file, cmd, arg);
+	mutex_unlock(&tu->ioctl_lock);
+	return ret;
+}