1 files changed, 76 insertions, 0 deletions

diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
index 6282e3c1a362..f81243c86790 100644
--- a/drivers/hid/hid-wiimote-debug.c
+++ b/drivers/hid/hid-wiimote-debug.c
@@ -10,12 +10,80 @@
  * any later version.
  */
 
+#include <linux/debugfs.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
+#include <linux/uaccess.h>
 #include "hid-wiimote.h"
 
 struct wiimote_debug {
         struct wiimote_data *wdata;
+        struct dentry *eeprom;
+};
+
+static int wiidebug_eeprom_open(struct inode *i, struct file *f)
+{
+        f->private_data = i->i_private;
+        return 0;
+}
+
+static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
+                                                                loff_t *off)
+{
+        struct wiimote_debug *dbg = f->private_data;
+        struct wiimote_data *wdata = dbg->wdata;
+        unsigned long flags;
+        ssize_t ret;
+        char buf[16];
+        __u16 size;
+
+        if (s == 0)
+                return -EINVAL;
+        if (*off > 0xffffff)
+                return 0;
+        if (s > 16)
+                s = 16;
+
+        ret = wiimote_cmd_acquire(wdata);
+        if (ret)
+                return ret;
+
+        spin_lock_irqsave(&wdata->state.lock, flags);
+        wdata->state.cmd_read_size = s;
+        wdata->state.cmd_read_buf = buf;
+        wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
+        wiiproto_req_reeprom(wdata, *off, s);
+        spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+        ret = wiimote_cmd_wait(wdata);
+        if (!ret)
+                size = wdata->state.cmd_read_size;
+
+        spin_lock_irqsave(&wdata->state.lock, flags);
+        wdata->state.cmd_read_buf = NULL;
+        spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+        wiimote_cmd_release(wdata);
+
+        if (ret)
+                return ret;
+        else if (size == 0)
+                return -EIO;
+
+        if (copy_to_user(u, buf, size))
+                return -EFAULT;
+
+        *off += size;
+        ret = size;
+
+        return ret;
+}
+
+static const struct file_operations wiidebug_eeprom_fops = {
+        .owner = THIS_MODULE,
+        .open = wiidebug_eeprom_open,
+        .read = wiidebug_eeprom_read,
+        .llseek = generic_file_llseek,
 };
 
 int wiidebug_init(struct wiimote_data *wdata)
@@ -29,6 +97,13 @@ int wiidebug_init(struct wiimote_data *wdata)
 
         dbg->wdata = wdata;
 
+        dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
+                dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
+        if (!dbg->eeprom) {
+                kfree(dbg);
+                return -ENOMEM;
+        }
+
         spin_lock_irqsave(&wdata->state.lock, flags);
         wdata->debug = dbg;
         spin_unlock_irqrestore(&wdata->state.lock, flags);
@@ -48,5 +123,6 @@ void wiidebug_deinit(struct wiimote_data *wdata)
         wdata->debug = NULL;
         spin_unlock_irqrestore(&wdata->state.lock, flags);
 
+        debugfs_remove(dbg->eeprom);
         kfree(dbg);
 }