1 files changed, 112 insertions, 0 deletions
diff --git a/sound/drivers/opl4/opl4_proc.c b/sound/drivers/opl4/opl4_proc.c
new file mode 100644
index 0000000000..f2149091e1
--- /dev/null
+++ b/sound/drivers/opl4/opl4_proc.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Functions for the OPL4 proc file
+ * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
+ */
+
+#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 const 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;
+	}
+	opl4->proc_entry = entry;
+	return 0;
+}
+
+void snd_opl4_free_proc(struct snd_opl4 *opl4)
+{
+	snd_info_free_entry(opl4->proc_entry);
+}