1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Roccat common functions for device specific drivers
4 *
5 * Copyright (c) 2011 Stefan Achatz <erazor_de@users.sourceforge.net>
6 */
7
8 /*
9 */
10
11 #include <linux/hid.h>
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include "hid-roccat-common.h"
15
roccat_common2_feature_report(uint8_t report_id)16 static inline uint16_t roccat_common2_feature_report(uint8_t report_id)
17 {
18 return 0x300 | report_id;
19 }
20
roccat_common2_receive(struct usb_device * usb_dev,uint report_id,void * data,uint size)21 int roccat_common2_receive(struct usb_device *usb_dev, uint report_id,
22 void *data, uint size)
23 {
24 char *buf;
25 int len;
26
27 buf = kmalloc(size, GFP_KERNEL);
28 if (buf == NULL)
29 return -ENOMEM;
30
31 len = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
32 HID_REQ_GET_REPORT,
33 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
34 roccat_common2_feature_report(report_id),
35 0, buf, size, USB_CTRL_SET_TIMEOUT);
36
37 memcpy(data, buf, size);
38 kfree(buf);
39 return ((len < 0) ? len : ((len != size) ? -EIO : 0));
40 }
41 EXPORT_SYMBOL_GPL(roccat_common2_receive);
42
roccat_common2_send(struct usb_device * usb_dev,uint report_id,void const * data,uint size)43 int roccat_common2_send(struct usb_device *usb_dev, uint report_id,
44 void const *data, uint size)
45 {
46 char *buf;
47 int len;
48
49 buf = kmemdup(data, size, GFP_KERNEL);
50 if (buf == NULL)
51 return -ENOMEM;
52
53 len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
54 HID_REQ_SET_REPORT,
55 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
56 roccat_common2_feature_report(report_id),
57 0, buf, size, USB_CTRL_SET_TIMEOUT);
58
59 kfree(buf);
60 return ((len < 0) ? len : ((len != size) ? -EIO : 0));
61 }
62 EXPORT_SYMBOL_GPL(roccat_common2_send);
63
64 enum roccat_common2_control_states {
65 ROCCAT_COMMON_CONTROL_STATUS_CRITICAL = 0,
66 ROCCAT_COMMON_CONTROL_STATUS_OK = 1,
67 ROCCAT_COMMON_CONTROL_STATUS_INVALID = 2,
68 ROCCAT_COMMON_CONTROL_STATUS_BUSY = 3,
69 ROCCAT_COMMON_CONTROL_STATUS_CRITICAL_NEW = 4,
70 };
71
roccat_common2_receive_control_status(struct usb_device * usb_dev)72 static int roccat_common2_receive_control_status(struct usb_device *usb_dev)
73 {
74 int retval;
75 struct roccat_common2_control control;
76
77 do {
78 msleep(50);
79 retval = roccat_common2_receive(usb_dev,
80 ROCCAT_COMMON_COMMAND_CONTROL,
81 &control, sizeof(struct roccat_common2_control));
82
83 if (retval)
84 return retval;
85
86 switch (control.value) {
87 case ROCCAT_COMMON_CONTROL_STATUS_OK:
88 return 0;
89 case ROCCAT_COMMON_CONTROL_STATUS_BUSY:
90 msleep(500);
91 continue;
92 case ROCCAT_COMMON_CONTROL_STATUS_INVALID:
93 case ROCCAT_COMMON_CONTROL_STATUS_CRITICAL:
94 case ROCCAT_COMMON_CONTROL_STATUS_CRITICAL_NEW:
95 return -EINVAL;
96 default:
97 dev_err(&usb_dev->dev,
98 "roccat_common2_receive_control_status: "
99 "unknown response value 0x%x\n",
100 control.value);
101 return -EINVAL;
102 }
103
104 } while (1);
105 }
106
roccat_common2_send_with_status(struct usb_device * usb_dev,uint command,void const * buf,uint size)107 int roccat_common2_send_with_status(struct usb_device *usb_dev,
108 uint command, void const *buf, uint size)
109 {
110 int retval;
111
112 retval = roccat_common2_send(usb_dev, command, buf, size);
113 if (retval)
114 return retval;
115
116 msleep(100);
117
118 return roccat_common2_receive_control_status(usb_dev);
119 }
120 EXPORT_SYMBOL_GPL(roccat_common2_send_with_status);
121
roccat_common2_device_init_struct(struct usb_device * usb_dev,struct roccat_common2_device * dev)122 int roccat_common2_device_init_struct(struct usb_device *usb_dev,
123 struct roccat_common2_device *dev)
124 {
125 mutex_init(&dev->lock);
126 return 0;
127 }
128 EXPORT_SYMBOL_GPL(roccat_common2_device_init_struct);
129
roccat_common2_sysfs_read(struct file * fp,struct kobject * kobj,char * buf,loff_t off,size_t count,size_t real_size,uint command)130 ssize_t roccat_common2_sysfs_read(struct file *fp, struct kobject *kobj,
131 char *buf, loff_t off, size_t count,
132 size_t real_size, uint command)
133 {
134 struct device *dev = kobj_to_dev(kobj)->parent->parent;
135 struct roccat_common2_device *roccat_dev = hid_get_drvdata(dev_get_drvdata(dev));
136 struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
137 int retval;
138
139 if (off >= real_size)
140 return 0;
141
142 if (off != 0 || count != real_size)
143 return -EINVAL;
144
145 mutex_lock(&roccat_dev->lock);
146 retval = roccat_common2_receive(usb_dev, command, buf, real_size);
147 mutex_unlock(&roccat_dev->lock);
148
149 return retval ? retval : real_size;
150 }
151 EXPORT_SYMBOL_GPL(roccat_common2_sysfs_read);
152
roccat_common2_sysfs_write(struct file * fp,struct kobject * kobj,void const * buf,loff_t off,size_t count,size_t real_size,uint command)153 ssize_t roccat_common2_sysfs_write(struct file *fp, struct kobject *kobj,
154 void const *buf, loff_t off, size_t count,
155 size_t real_size, uint command)
156 {
157 struct device *dev = kobj_to_dev(kobj)->parent->parent;
158 struct roccat_common2_device *roccat_dev = hid_get_drvdata(dev_get_drvdata(dev));
159 struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
160 int retval;
161
162 if (off != 0 || count != real_size)
163 return -EINVAL;
164
165 mutex_lock(&roccat_dev->lock);
166 retval = roccat_common2_send_with_status(usb_dev, command, buf, real_size);
167 mutex_unlock(&roccat_dev->lock);
168
169 return retval ? retval : real_size;
170 }
171 EXPORT_SYMBOL_GPL(roccat_common2_sysfs_write);
172
173 MODULE_AUTHOR("Stefan Achatz");
174 MODULE_DESCRIPTION("USB Roccat common driver");
175 MODULE_LICENSE("GPL v2");
176