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");
128