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_common2_feature_report(uint8_t report_id)
  20 {
  21         return 0x300 | report_id;
  22 }
  23
  24 int roccat_common2_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_common2_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_common2_receive);
  45
  46 int roccat_common2_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_common2_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_common2_send);
  66
  67 enum roccat_common2_control_states {
  68         ROCCAT_COMMON_CONTROL_STATUS_OVERLOAD = 0,
  69         ROCCAT_COMMON_CONTROL_STATUS_OK = 1,
  70         ROCCAT_COMMON_CONTROL_STATUS_INVALID = 2,
  71         ROCCAT_COMMON_CONTROL_STATUS_WAIT = 3,
  72 };
  73
  74 static int roccat_common2_receive_control_status(struct usb_device *usb_dev)
  75 {
  76         int retval;
  77         struct roccat_common2_control control;
  78
  79         do {
  80                 msleep(50);
  81                 retval = roccat_common2_receive(usb_dev,
  82                                 ROCCAT_COMMON_COMMAND_CONTROL,
  83                                 &control, sizeof(struct roccat_common2_control));
  84
  85                 if (retval)
  86                         return retval;
  87
  88                 switch (control.value) {
  89                 case ROCCAT_COMMON_CONTROL_STATUS_OK:
  90                         return 0;
  91                 case ROCCAT_COMMON_CONTROL_STATUS_WAIT:
  92                         msleep(500);
  93                         continue;
  94                 case ROCCAT_COMMON_CONTROL_STATUS_INVALID:
  95
  96                 case ROCCAT_COMMON_CONTROL_STATUS_OVERLOAD:
  97                         /* seems to be critical - replug necessary */
  98                         return -EINVAL;
  99                 default:
 100                         dev_err(&usb_dev->dev,
 101                                         "roccat_common2_receive_control_status: "
 102                                         "unknown response value 0x%x\n",
 103                                         control.value);
 104                         return -EINVAL;
 105                 }
 106
 107         } while (1);
 108 }
 109
 110 int roccat_common2_send_with_status(struct usb_device *usb_dev,
 111                 uint command, void const *buf, uint size)
 112 {
 113         int retval;
 114
 115         retval = roccat_common2_send(usb_dev, command, buf, size);
 116         if (retval)
 117                 return retval;
 118
 119         msleep(100);
 120
 121         return roccat_common2_receive_control_status(usb_dev);
 122 }
 123 EXPORT_SYMBOL_GPL(roccat_common2_send_with_status);
 124
 125 MODULE_AUTHOR("Stefan Achatz");
 126 MODULE_DESCRIPTION("USB Roccat common driver");
 127 MODULE_LICENSE("GPL v2");