1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Roccat Lua driver for Linux
4 *
5 * Copyright (c) 2012 Stefan Achatz <erazor_de@users.sourceforge.net>
6 */
7
8 /*
9 */
10
11 /*
12 * Roccat Lua is a gamer mouse which cpi, button and light settings can be
13 * configured.
14 */
15
16 #include <linux/device.h>
17 #include <linux/input.h>
18 #include <linux/hid.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
21 #include <linux/hid-roccat.h>
22 #include "hid-ids.h"
23 #include "hid-roccat-common.h"
24 #include "hid-roccat-lua.h"
25
lua_sysfs_read(struct file * fp,struct kobject * kobj,char * buf,loff_t off,size_t count,size_t real_size,uint command)26 static ssize_t lua_sysfs_read(struct file *fp, struct kobject *kobj,
27 char *buf, loff_t off, size_t count,
28 size_t real_size, uint command)
29 {
30 struct device *dev = kobj_to_dev(kobj);
31 struct lua_device *lua = hid_get_drvdata(dev_get_drvdata(dev));
32 struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
33 int retval;
34
35 if (off >= real_size)
36 return 0;
37
38 if (off != 0 || count != real_size)
39 return -EINVAL;
40
41 mutex_lock(&lua->lua_lock);
42 retval = roccat_common2_receive(usb_dev, command, buf, real_size);
43 mutex_unlock(&lua->lua_lock);
44
45 return retval ? retval : real_size;
46 }
47
lua_sysfs_write(struct file * fp,struct kobject * kobj,void const * buf,loff_t off,size_t count,size_t real_size,uint command)48 static ssize_t lua_sysfs_write(struct file *fp, struct kobject *kobj,
49 void const *buf, loff_t off, size_t count,
50 size_t real_size, uint command)
51 {
52 struct device *dev = kobj_to_dev(kobj);
53 struct lua_device *lua = hid_get_drvdata(dev_get_drvdata(dev));
54 struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
55 int retval;
56
57 if (off != 0 || count != real_size)
58 return -EINVAL;
59
60 mutex_lock(&lua->lua_lock);
61 retval = roccat_common2_send(usb_dev, command, buf, real_size);
62 mutex_unlock(&lua->lua_lock);
63
64 return retval ? retval : real_size;
65 }
66
67 #define LUA_SYSFS_W(thingy, THINGY) \
68 static ssize_t lua_sysfs_write_ ## thingy(struct file *fp, \
69 struct kobject *kobj, struct bin_attribute *attr, \
70 char *buf, loff_t off, size_t count) \
71 { \
72 return lua_sysfs_write(fp, kobj, buf, off, count, \
73 LUA_SIZE_ ## THINGY, LUA_COMMAND_ ## THINGY); \
74 }
75
76 #define LUA_SYSFS_R(thingy, THINGY) \
77 static ssize_t lua_sysfs_read_ ## thingy(struct file *fp, \
78 struct kobject *kobj, struct bin_attribute *attr, \
79 char *buf, loff_t off, size_t count) \
80 { \
81 return lua_sysfs_read(fp, kobj, buf, off, count, \
82 LUA_SIZE_ ## THINGY, LUA_COMMAND_ ## THINGY); \
83 }
84
85 #define LUA_BIN_ATTRIBUTE_RW(thingy, THINGY) \
86 LUA_SYSFS_W(thingy, THINGY) \
87 LUA_SYSFS_R(thingy, THINGY) \
88 static struct bin_attribute lua_ ## thingy ## _attr = { \
89 .attr = { .name = #thingy, .mode = 0660 }, \
90 .size = LUA_SIZE_ ## THINGY, \
91 .read = lua_sysfs_read_ ## thingy, \
92 .write = lua_sysfs_write_ ## thingy \
93 };
94
LUA_BIN_ATTRIBUTE_RW(control,CONTROL)95 LUA_BIN_ATTRIBUTE_RW(control, CONTROL)
96
97 static int lua_create_sysfs_attributes(struct usb_interface *intf)
98 {
99 return sysfs_create_bin_file(&intf->dev.kobj, &lua_control_attr);
100 }
101
lua_remove_sysfs_attributes(struct usb_interface * intf)102 static void lua_remove_sysfs_attributes(struct usb_interface *intf)
103 {
104 sysfs_remove_bin_file(&intf->dev.kobj, &lua_control_attr);
105 }
106
lua_init_lua_device_struct(struct usb_device * usb_dev,struct lua_device * lua)107 static int lua_init_lua_device_struct(struct usb_device *usb_dev,
108 struct lua_device *lua)
109 {
110 mutex_init(&lua->lua_lock);
111
112 return 0;
113 }
114
lua_init_specials(struct hid_device * hdev)115 static int lua_init_specials(struct hid_device *hdev)
116 {
117 struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
118 struct usb_device *usb_dev = interface_to_usbdev(intf);
119 struct lua_device *lua;
120 int retval;
121
122 lua = kzalloc(sizeof(*lua), GFP_KERNEL);
123 if (!lua) {
124 hid_err(hdev, "can't alloc device descriptor\n");
125 return -ENOMEM;
126 }
127 hid_set_drvdata(hdev, lua);
128
129 retval = lua_init_lua_device_struct(usb_dev, lua);
130 if (retval) {
131 hid_err(hdev, "couldn't init struct lua_device\n");
132 goto exit;
133 }
134
135 retval = lua_create_sysfs_attributes(intf);
136 if (retval) {
137 hid_err(hdev, "cannot create sysfs files\n");
138 goto exit;
139 }
140
141 return 0;
142 exit:
143 kfree(lua);
144 return retval;
145 }
146
lua_remove_specials(struct hid_device * hdev)147 static void lua_remove_specials(struct hid_device *hdev)
148 {
149 struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
150 struct lua_device *lua;
151
152 lua_remove_sysfs_attributes(intf);
153
154 lua = hid_get_drvdata(hdev);
155 kfree(lua);
156 }
157
lua_probe(struct hid_device * hdev,const struct hid_device_id * id)158 static int lua_probe(struct hid_device *hdev,
159 const struct hid_device_id *id)
160 {
161 int retval;
162
163 if (!hid_is_usb(hdev))
164 return -EINVAL;
165
166 retval = hid_parse(hdev);
167 if (retval) {
168 hid_err(hdev, "parse failed\n");
169 goto exit;
170 }
171
172 retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
173 if (retval) {
174 hid_err(hdev, "hw start failed\n");
175 goto exit;
176 }
177
178 retval = lua_init_specials(hdev);
179 if (retval) {
180 hid_err(hdev, "couldn't install mouse\n");
181 goto exit_stop;
182 }
183
184 return 0;
185
186 exit_stop:
187 hid_hw_stop(hdev);
188 exit:
189 return retval;
190 }
191
lua_remove(struct hid_device * hdev)192 static void lua_remove(struct hid_device *hdev)
193 {
194 lua_remove_specials(hdev);
195 hid_hw_stop(hdev);
196 }
197
198 static const struct hid_device_id lua_devices[] = {
199 { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_LUA) },
200 { }
201 };
202
203 MODULE_DEVICE_TABLE(hid, lua_devices);
204
205 static struct hid_driver lua_driver = {
206 .name = "lua",
207 .id_table = lua_devices,
208 .probe = lua_probe,
209 .remove = lua_remove
210 };
211 module_hid_driver(lua_driver);
212
213 MODULE_AUTHOR("Stefan Achatz");
214 MODULE_DESCRIPTION("USB Roccat Lua driver");
215 MODULE_LICENSE("GPL v2");
216