dsp: audio_ion: Add 32 bit userspace ioctl support

Add ioctl support for 32 bit userspace on 64bit platform.

Change-Id: I208c452993d10d1901eb926dcd4e4a0a1747eaea
Signed-off-by: Srinivas Marka <[email protected]>

dsp/msm_audio_ion.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2013-2021, The Linux Foundation. All rights reserved.
- * Copyright (c) 2022-2023, Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022-2024, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/init.h>
@@ -19,6 +19,7 @@
 #include <linux/of_device.h>
 #include <linux/export.h>
 #include <linux/ioctl.h>
+#include <linux/compat.h>
 #include <linux/cdev.h>
 #include <linux/fs.h>
 #include <linux/device.h>
@@ -779,6 +780,15 @@ static long msm_audio_ion_ioctl(struct file *file, unsigned int ioctl_num,
 	return ret;
 }
 
+/* support of 32bit userspace on 64bit platforms */
+#ifdef CONFIG_COMPAT
+static long msm_audio_ion_ioctl_compat(struct file *file, unsigned int cmd,
+					unsigned long arg)
+{
+	return msm_audio_ion_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static const struct of_device_id msm_audio_ion_dt_match[] = {
 	{ .compatible = "qcom,msm-audio-ion" },
 	{ .compatible = "qcom,msm-audio-ion-cma"},
@@ -791,6 +801,9 @@ static const struct file_operations msm_audio_ion_fops = {
 	.open = msm_audio_ion_open,
 	.release = msm_audio_ion_release,
 	.unlocked_ioctl = msm_audio_ion_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = msm_audio_ion_ioctl_compat,
+#endif
 };
 
 static int msm_audio_ion_reg_chrdev(struct msm_audio_ion_private *ion_data)