1 files changed, 80 insertions, 3 deletions

diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
index da1ad77d8d51..87d403df1f3f 100644
--- a/drivers/usb/dwc3/debugfs.c
+++ b/drivers/usb/dwc3/debugfs.c
@@ -44,12 +44,12 @@
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/delay.h>
-
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
 
 #include "core.h"
 #include "gadget.h"
 #include "io.h"
+#include "debug.h"
 
 struct dwc3_register {
         const char      *name;
@@ -405,6 +405,75 @@ static const struct file_operations dwc3_regdump_fops = {
         .release                = single_release,
 };
 
+static int dwc3_mode_show(struct seq_file *s, void *unused)
+{
+        struct dwc3             *dwc = s->private;
+        unsigned long           flags;
+        u32                     reg;
+
+        spin_lock_irqsave(&dwc->lock, flags);
+        reg = dwc3_readl(dwc->regs, DWC3_GCTL);
+        spin_unlock_irqrestore(&dwc->lock, flags);
+
+        switch (DWC3_GCTL_PRTCAP(reg)) {
+        case DWC3_GCTL_PRTCAP_HOST:
+                seq_printf(s, "host\n");
+                break;
+        case DWC3_GCTL_PRTCAP_DEVICE:
+                seq_printf(s, "device\n");
+                break;
+        case DWC3_GCTL_PRTCAP_OTG:
+                seq_printf(s, "OTG\n");
+                break;
+        default:
+                seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
+        }
+
+        return 0;
+}
+
+static int dwc3_mode_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, dwc3_mode_show, inode->i_private);
+}
+
+static ssize_t dwc3_mode_write(struct file *file,
+                const char __user *ubuf, size_t count, loff_t *ppos)
+{
+        struct seq_file         *s = file->private_data;
+        struct dwc3             *dwc = s->private;
+        unsigned long           flags;
+        u32                     mode = 0;
+        char                    buf[32];
+
+        if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+                return -EFAULT;
+
+        if (!strncmp(buf, "host", 4))
+                mode |= DWC3_GCTL_PRTCAP_HOST;
+
+        if (!strncmp(buf, "device", 6))
+                mode |= DWC3_GCTL_PRTCAP_DEVICE;
+
+        if (!strncmp(buf, "otg", 3))
+                mode |= DWC3_GCTL_PRTCAP_OTG;
+
+        if (mode) {
+                spin_lock_irqsave(&dwc->lock, flags);
+                dwc3_set_mode(dwc, mode);
+                spin_unlock_irqrestore(&dwc->lock, flags);
+        }
+        return count;
+}
+
+static const struct file_operations dwc3_mode_fops = {
+        .open                   = dwc3_mode_open,
+        .write                  = dwc3_mode_write,
+        .read                   = seq_read,
+        .llseek                 = seq_lseek,
+        .release                = single_release,
+};
+
 int __devinit dwc3_debugfs_init(struct dwc3 *dwc)
 {
         struct dentry           *root;
@@ -412,7 +481,7 @@ int __devinit dwc3_debugfs_init(struct dwc3 *dwc)
         int                     ret;
 
         root = debugfs_create_dir(dev_name(dwc->dev), NULL);
-        if (IS_ERR(root)){
+        if (IS_ERR(root)) {
                 ret = PTR_ERR(root);
                 goto err0;
         }
@@ -425,6 +494,14 @@ int __devinit dwc3_debugfs_init(struct dwc3 *dwc)
                 ret = PTR_ERR(file);
                 goto err1;
         }
+
+        file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,
+                        dwc, &dwc3_mode_fops);
+        if (IS_ERR(file)) {
+                ret = PTR_ERR(file);
+                goto err1;
+        }
+
         return 0;
 
 err1: