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
19static inline uint16_t roccat_common2_feature_report(uint8_t report_id)
20{
21	return 0x300 | report_id;
22}
23
24int 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}
44EXPORT_SYMBOL_GPL(roccat_common2_receive);
45
46int 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}
65EXPORT_SYMBOL_GPL(roccat_common2_send);
66
67enum roccat_common2_control_states {
68	ROCCAT_COMMON_CONTROL_STATUS_CRITICAL = 0,
69	ROCCAT_COMMON_CONTROL_STATUS_OK = 1,
70	ROCCAT_COMMON_CONTROL_STATUS_INVALID = 2,
71	ROCCAT_COMMON_CONTROL_STATUS_BUSY = 3,
72	ROCCAT_COMMON_CONTROL_STATUS_CRITICAL_NEW = 4,
73};
74
75static int roccat_common2_receive_control_status(struct usb_device *usb_dev)
76{
77	int retval;
78	struct roccat_common2_control control;
79
80	do {
81		msleep(50);
82		retval = roccat_common2_receive(usb_dev,
83				ROCCAT_COMMON_COMMAND_CONTROL,
84				&control, sizeof(struct roccat_common2_control));
85
86		if (retval)
87			return retval;
88
89		switch (control.value) {
90		case ROCCAT_COMMON_CONTROL_STATUS_OK:
91			return 0;
92		case ROCCAT_COMMON_CONTROL_STATUS_BUSY:
93			msleep(500);
94			continue;
95		case ROCCAT_COMMON_CONTROL_STATUS_INVALID:
96		case ROCCAT_COMMON_CONTROL_STATUS_CRITICAL:
97		case ROCCAT_COMMON_CONTROL_STATUS_CRITICAL_NEW:
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
110int 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}
123EXPORT_SYMBOL_GPL(roccat_common2_send_with_status);
124
125int roccat_common2_device_init_struct(struct usb_device *usb_dev,
126		struct roccat_common2_device *dev)
127{
128	mutex_init(&dev->lock);
129	return 0;
130}
131EXPORT_SYMBOL_GPL(roccat_common2_device_init_struct);
132
133ssize_t roccat_common2_sysfs_read(struct file *fp, struct kobject *kobj,
134		char *buf, loff_t off, size_t count,
135		size_t real_size, uint command)
136{
137	struct device *dev =
138			container_of(kobj, struct device, kobj)->parent->parent;
139	struct roccat_common2_device *roccat_dev = hid_get_drvdata(dev_get_drvdata(dev));
140	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
141	int retval;
142
143	if (off >= real_size)
144		return 0;
145
146	if (off != 0 || count != real_size)
147		return -EINVAL;
148
149	mutex_lock(&roccat_dev->lock);
150	retval = roccat_common2_receive(usb_dev, command, buf, real_size);
151	mutex_unlock(&roccat_dev->lock);
152
153	return retval ? retval : real_size;
154}
155EXPORT_SYMBOL_GPL(roccat_common2_sysfs_read);
156
157ssize_t roccat_common2_sysfs_write(struct file *fp, struct kobject *kobj,
158		void const *buf, loff_t off, size_t count,
159		size_t real_size, uint command)
160{
161	struct device *dev =
162			container_of(kobj, struct device, kobj)->parent->parent;
163	struct roccat_common2_device *roccat_dev = hid_get_drvdata(dev_get_drvdata(dev));
164	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
165	int retval;
166
167	if (off != 0 || count != real_size)
168		return -EINVAL;
169
170	mutex_lock(&roccat_dev->lock);
171	retval = roccat_common2_send_with_status(usb_dev, command, buf, real_size);
172	mutex_unlock(&roccat_dev->lock);
173
174	return retval ? retval : real_size;
175}
176EXPORT_SYMBOL_GPL(roccat_common2_sysfs_write);
177
178MODULE_AUTHOR("Stefan Achatz");
179MODULE_DESCRIPTION("USB Roccat common driver");
180MODULE_LICENSE("GPL v2");
181