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