v4.19.13 snapshot.
diff --git a/sound/drivers/opl4/opl4_proc.c b/sound/drivers/opl4/opl4_proc.c
new file mode 100644
index 0000000..16b2409
--- /dev/null
+++ b/sound/drivers/opl4/opl4_proc.c
@@ -0,0 +1,129 @@
+/*
+ * Functions for the OPL4 proc file
+ * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "opl4_local.h"
+#include <linux/vmalloc.h>
+#include <linux/export.h>
+#include <sound/info.h>
+
+static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
+ unsigned short mode, void **file_private_data)
+{
+ struct snd_opl4 *opl4 = entry->private_data;
+
+ mutex_lock(&opl4->access_mutex);
+ if (opl4->memory_access) {
+ mutex_unlock(&opl4->access_mutex);
+ return -EBUSY;
+ }
+ opl4->memory_access++;
+ mutex_unlock(&opl4->access_mutex);
+ return 0;
+}
+
+static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
+ unsigned short mode, void *file_private_data)
+{
+ struct snd_opl4 *opl4 = entry->private_data;
+
+ mutex_lock(&opl4->access_mutex);
+ opl4->memory_access--;
+ mutex_unlock(&opl4->access_mutex);
+ return 0;
+}
+
+static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
+ void *file_private_data,
+ struct file *file, char __user *_buf,
+ size_t count, loff_t pos)
+{
+ struct snd_opl4 *opl4 = entry->private_data;
+ char* buf;
+
+ buf = vmalloc(count);
+ if (!buf)
+ return -ENOMEM;
+ snd_opl4_read_memory(opl4, buf, pos, count);
+ if (copy_to_user(_buf, buf, count)) {
+ vfree(buf);
+ return -EFAULT;
+ }
+ vfree(buf);
+ return count;
+}
+
+static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
+ void *file_private_data,
+ struct file *file,
+ const char __user *_buf,
+ size_t count, loff_t pos)
+{
+ struct snd_opl4 *opl4 = entry->private_data;
+ char *buf;
+
+ buf = vmalloc(count);
+ if (!buf)
+ return -ENOMEM;
+ if (copy_from_user(buf, _buf, count)) {
+ vfree(buf);
+ return -EFAULT;
+ }
+ snd_opl4_write_memory(opl4, buf, pos, count);
+ vfree(buf);
+ return count;
+}
+
+static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
+ .open = snd_opl4_mem_proc_open,
+ .release = snd_opl4_mem_proc_release,
+ .read = snd_opl4_mem_proc_read,
+ .write = snd_opl4_mem_proc_write,
+};
+
+int snd_opl4_create_proc(struct snd_opl4 *opl4)
+{
+ struct snd_info_entry *entry;
+
+ entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
+ if (entry) {
+ if (opl4->hardware < OPL3_HW_OPL4_ML) {
+ /* OPL4 can access 4 MB external ROM/SRAM */
+ entry->mode |= 0200;
+ entry->size = 4 * 1024 * 1024;
+ } else {
+ /* OPL4-ML has 1 MB internal ROM */
+ entry->size = 1 * 1024 * 1024;
+ }
+ entry->content = SNDRV_INFO_CONTENT_DATA;
+ entry->c.ops = &snd_opl4_mem_proc_ops;
+ entry->module = THIS_MODULE;
+ entry->private_data = opl4;
+ if (snd_info_register(entry) < 0) {
+ snd_info_free_entry(entry);
+ entry = NULL;
+ }
+ }
+ opl4->proc_entry = entry;
+ return 0;
+}
+
+void snd_opl4_free_proc(struct snd_opl4 *opl4)
+{
+ snd_info_free_entry(opl4->proc_entry);
+}