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-rw-r--r--drivers/usb/class/cdc-wdm.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 122d056d96d5..8a230f0ef77c 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -13,6 +13,7 @@
*/
#include <linux/kernel.h>
#include <linux/errno.h>
+#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mutex.h>
@@ -644,6 +645,22 @@ static int wdm_release(struct inode *inode, struct file *file)
return 0;
}
+static long wdm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct wdm_device *desc = file->private_data;
+ int rv = 0;
+
+ switch (cmd) {
+ case IOCTL_WDM_MAX_COMMAND:
+ if (copy_to_user((void __user *)arg, &desc->wMaxCommand, sizeof(desc->wMaxCommand)))
+ rv = -EFAULT;
+ break;
+ default:
+ rv = -ENOTTY;
+ }
+ return rv;
+}
+
static const struct file_operations wdm_fops = {
.owner = THIS_MODULE,
.read = wdm_read,
@@ -652,6 +669,8 @@ static const struct file_operations wdm_fops = {
.flush = wdm_flush,
.release = wdm_release,
.poll = wdm_poll,
+ .unlocked_ioctl = wdm_ioctl,
+ .compat_ioctl = wdm_ioctl,
.llseek = noop_llseek,
};