1 files changed, 149 insertions, 0 deletions
diff --git a/sound/synth/emux/emux_hwdep.c b/sound/synth/emux/emux_hwdep.c
new file mode 100644
index 0000000000..81719bfb8e
--- /dev/null
+++ b/sound/synth/emux/emux_hwdep.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Interface for hwdep device
+ *
+ *  Copyright (C) 2004 Takashi Iwai <tiwai@suse.de>
+ */
+
+#include <sound/core.h>
+#include <sound/hwdep.h>
+#include <linux/uaccess.h>
+#include <linux/nospec.h>
+#include "emux_voice.h"
+
+#define TMP_CLIENT_ID	0x1001
+
+/*
+ * load patch
+ */
+static int
+snd_emux_hwdep_load_patch(struct snd_emux *emu, void __user *arg)
+{
+	int err;
+	struct soundfont_patch_info patch;
+
+	if (copy_from_user(&patch, arg, sizeof(patch)))
+		return -EFAULT;
+
+	if (patch.key == GUS_PATCH)
+		return snd_soundfont_load_guspatch(emu->sflist, arg,
+						   patch.len + sizeof(patch),
+						   TMP_CLIENT_ID);
+
+	if (patch.type >= SNDRV_SFNT_LOAD_INFO &&
+	    patch.type <= SNDRV_SFNT_PROBE_DATA) {
+		err = snd_soundfont_load(emu->sflist, arg, patch.len + sizeof(patch), TMP_CLIENT_ID);
+		if (err < 0)
+			return err;
+	} else {
+		if (emu->ops.load_fx)
+			return emu->ops.load_fx(emu, patch.type, patch.optarg, arg, patch.len + sizeof(patch));
+		else
+			return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * set misc mode
+ */
+static int
+snd_emux_hwdep_misc_mode(struct snd_emux *emu, void __user *arg)
+{
+	struct snd_emux_misc_mode info;
+	int i;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+	if (info.mode < 0 || info.mode >= EMUX_MD_END)
+		return -EINVAL;
+	info.mode = array_index_nospec(info.mode, EMUX_MD_END);
+
+	if (info.port < 0) {
+		for (i = 0; i < emu->num_ports; i++)
+			emu->portptrs[i]->ctrls[info.mode] = info.value;
+	} else {
+		if (info.port < emu->num_ports) {
+			info.port = array_index_nospec(info.port, emu->num_ports);
+			emu->portptrs[info.port]->ctrls[info.mode] = info.value;
+		}
+	}
+	return 0;
+}
+
+
+/*
+ * ioctl
+ */
+static int
+snd_emux_hwdep_ioctl(struct snd_hwdep * hw, struct file *file,
+		     unsigned int cmd, unsigned long arg)
+{
+	struct snd_emux *emu = hw->private_data;
+
+	switch (cmd) {
+	case SNDRV_EMUX_IOCTL_VERSION:
+		return put_user(SNDRV_EMUX_VERSION, (unsigned int __user *)arg);
+	case SNDRV_EMUX_IOCTL_LOAD_PATCH:
+		return snd_emux_hwdep_load_patch(emu, (void __user *)arg);
+	case SNDRV_EMUX_IOCTL_RESET_SAMPLES:
+		snd_soundfont_remove_samples(emu->sflist);
+		break;
+	case SNDRV_EMUX_IOCTL_REMOVE_LAST_SAMPLES:
+		snd_soundfont_remove_unlocked(emu->sflist);
+		break;
+	case SNDRV_EMUX_IOCTL_MEM_AVAIL:
+		if (emu->memhdr) {
+			int size = snd_util_mem_avail(emu->memhdr);
+			return put_user(size, (unsigned int __user *)arg);
+		}
+		break;
+	case SNDRV_EMUX_IOCTL_MISC_MODE:
+		return snd_emux_hwdep_misc_mode(emu, (void __user *)arg);
+	}
+
+	return 0;
+}
+
+
+/*
+ * register hwdep device
+ */
+
+int
+snd_emux_init_hwdep(struct snd_emux *emu)
+{
+	struct snd_hwdep *hw;
+	int err;
+
+	err = snd_hwdep_new(emu->card, SNDRV_EMUX_HWDEP_NAME, emu->hwdep_idx, &hw);
+	if (err < 0)
+		return err;
+	emu->hwdep = hw;
+	strcpy(hw->name, SNDRV_EMUX_HWDEP_NAME);
+	hw->iface = SNDRV_HWDEP_IFACE_EMUX_WAVETABLE;
+	hw->ops.ioctl = snd_emux_hwdep_ioctl;
+	/* The ioctl parameter types are compatible between 32- and
+	 * 64-bit architectures, so use the same function. */
+	hw->ops.ioctl_compat = snd_emux_hwdep_ioctl;
+	hw->exclusive = 1;
+	hw->private_data = emu;
+	err = snd_card_register(emu->card);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+
+/*
+ * unregister
+ */
+void
+snd_emux_delete_hwdep(struct snd_emux *emu)
+{
+	if (emu->hwdep) {
+		snd_device_free(emu->card, emu->hwdep);
+		emu->hwdep = NULL;
+	}
+}