drivers/hid/hid-roccat-common.c

   1 /*
   2  * Roccat common functions for device specific drivers
   3  *
   4  * Copyright (c) 2011 Stefan Achatz <erazor_de@users.sourceforge.net>
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  */
  13
  14 #include <linux/slab.h>
  15 #include "hid-roccat-common.h"
  16
  17 int roccat_common_receive(struct usb_device *usb_dev, uint usb_command,
  18                 void *data, uint size)
  19 {
  20         char *buf;
  21         int len;
  22
  23         buf = kmalloc(size, GFP_KERNEL);
  24         if (buf == NULL)
  25                 return -ENOMEM;
  26
  27         len = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
  28                         USB_REQ_CLEAR_FEATURE,
  29                         USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
  30                         usb_command, 0, buf, size, USB_CTRL_SET_TIMEOUT);
  31
  32         memcpy(data, buf, size);
  33         kfree(buf);
  34         return ((len < 0) ? len : ((len != size) ? -EIO : 0));
  35 }
  36 EXPORT_SYMBOL_GPL(roccat_common_receive);
  37
  38 int roccat_common_send(struct usb_device *usb_dev, uint usb_command,
  39                 void const *data, uint size)
  40 {
  41         char *buf;
  42         int len;
  43
  44         buf = kmalloc(size, GFP_KERNEL);
  45         if (buf == NULL)
  46                 return -ENOMEM;
  47
  48         memcpy(buf, data, size);
  49
  50         len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
  51                         USB_REQ_SET_CONFIGURATION,
  52                         USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
  53                         usb_command, 0, buf, size, USB_CTRL_SET_TIMEOUT);
  54
  55         kfree(buf);
  56         return ((len < 0) ? len : ((len != size) ? -EIO : 0));
  57 }
  58 EXPORT_SYMBOL_GPL(roccat_common_send);
  59
  60 MODULE_AUTHOR("Stefan Achatz");
  61 MODULE_DESCRIPTION("USB Roccat common driver");
  62 MODULE_LICENSE("GPL v2");