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/hid.h>
  15 #include <linux/slab.h>
  16 #include <linux/module.h>
  17 #include "hid-roccat-common.h"
  18
  19 static inline uint16_t roccat_common_feature_report(uint8_t report_id)
  20 {
  21         return 0x300 | report_id;
  22 }
  23
  24 int roccat_common_receive(struct usb_device *usb_dev, uint report_id,
  25                 void *data, uint size)
  26 {
  27         char *buf;
  28         int len;
  29
  30         buf = kmalloc(size, GFP_KERNEL);
  31         if (buf == NULL)
  32                 return -ENOMEM;
  33
  34         len = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
  35                         HID_REQ_GET_REPORT,
  36                         USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
  37                         roccat_common_feature_report(report_id),
  38                         0, buf, size, USB_CTRL_SET_TIMEOUT);
  39
  40         memcpy(data, buf, size);
  41         kfree(buf);
  42         return ((len < 0) ? len : ((len != size) ? -EIO : 0));
  43 }
  44 EXPORT_SYMBOL_GPL(roccat_common_receive);
  45
  46 int roccat_common_send(struct usb_device *usb_dev, uint report_id,
  47                 void const *data, uint size)
  48 {
  49         char *buf;
  50         int len;
  51
  52         buf = kmemdup(data, size, GFP_KERNEL);
  53         if (buf == NULL)
  54                 return -ENOMEM;
  55
  56         len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
  57                         HID_REQ_SET_REPORT,
  58                         USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
  59                         roccat_common_feature_report(report_id),
  60                         0, buf, size, USB_CTRL_SET_TIMEOUT);
  61
  62         kfree(buf);
  63         return ((len < 0) ? len : ((len != size) ? -EIO : 0));
  64 }
  65 EXPORT_SYMBOL_GPL(roccat_common_send);
  66
  67 MODULE_AUTHOR("Stefan Achatz");
  68 MODULE_DESCRIPTION("USB Roccat common driver");
  69 MODULE_LICENSE("GPL v2");