Re: [PATCH 1/3] picolcd: driver for PicoLCD HID device

+static int picolcd_raw_event(struct hid_device *hdev,
+               struct hid_report *report, u8 *raw_data, int size)
+{
+       struct picolcd_data *data = hid_get_drvdata(hdev);
+       char hexdata[25];
+       int i;
+
+       if (data == NULL)
+               return 1;
+
+       for (i = 0; i < sizeof(hexdata) / 2; i++)
+               sprintf(hexdata+2*i, "%02hhx", raw_data[i]);
+       if (size >= sizeof(hexdata)/2) {
+               hexdata[sizeof(hexdata)-4] = '.';
+               hexdata[sizeof(hexdata)-3] = '.';
+               hexdata[sizeof(hexdata)-2] = '.';
+               hexdata[sizeof(hexdata)-1] = '\0';
+       } else
+               hexdata[size*2] = '\0';
+
+       switch (report->id) {
+       case REPORT_KEYPAD:
+               if (size == 3 && raw_data[0] == 0x11 && data->input_keys) {
+                       return picolcd_raw_keypad(hdev, report, raw_data+1, size-1);
+               } else {
+                       dbg_hid(PICOLCD_NAME " unsupported key event (%d bytes): 0x%s\n", size, hexdata);
+                       break;
+               }
+               break;
+       case REPORT_VERSION:
+               if (size == 3)
+                       dev_info(&hdev->dev, "Firmware version is %hd.%hd\n", raw_data[1], raw_data[2]);
+
+               spin_lock(&data->lock);