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HID: usbhid: defer LED setting to a workqueue
[karo-tx-linux.git] / 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 = kmemdup(data, size, GFP_KERNEL);
52         if (buf == NULL)
53                 return -ENOMEM;
54
55         len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
56                         HID_REQ_SET_REPORT,
57                         USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
58                         roccat_common_feature_report(report_id),
59                         0, buf, size, USB_CTRL_SET_TIMEOUT);
60
61         kfree(buf);
62         return ((len < 0) ? len : ((len != size) ? -EIO : 0));
63 }
64 EXPORT_SYMBOL_GPL(roccat_common_send);
65
66 MODULE_AUTHOR("Stefan Achatz");
67 MODULE_DESCRIPTION("USB Roccat common driver");
68 MODULE_LICENSE("GPL v2");