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_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 
75 static 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 
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 int 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 }
131 EXPORT_SYMBOL_GPL(roccat_common2_device_init_struct);
132 
133 ssize_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 }
155 EXPORT_SYMBOL_GPL(roccat_common2_sysfs_read);
156 
157 ssize_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 }
176 EXPORT_SYMBOL_GPL(roccat_common2_sysfs_write);
177 
178 MODULE_AUTHOR("Stefan Achatz");
179 MODULE_DESCRIPTION("USB Roccat common driver");
180 MODULE_LICENSE("GPL v2");
181