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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Roccat Lua driver for Linux
4 *
5 * Copyright (c) 2012 Stefan Achatz <[email protected]>
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
26static 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
48static 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) \
68static ssize_t lua_sysfs_write_ ## thingy(struct file *fp, \
69 struct kobject *kobj, const 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) \
77static ssize_t lua_sysfs_read_ ## thingy(struct file *fp, \
78 struct kobject *kobj, const 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) \
86LUA_SYSFS_W(thingy, THINGY) \
87LUA_SYSFS_R(thingy, THINGY) \
88static const 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
95LUA_BIN_ATTRIBUTE_RW(control, CONTROL)
96
97static int lua_create_sysfs_attributes(struct usb_interface *intf)
98{
99 return sysfs_create_bin_file(&intf->dev.kobj, &lua_control_attr);
100}
101
102static void lua_remove_sysfs_attributes(struct usb_interface *intf)
103{
104 sysfs_remove_bin_file(&intf->dev.kobj, &lua_control_attr);
105}
106
107static 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
115static 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_obj(*lua);
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;
142exit:
143 kfree(lua);
144 return retval;
145}
146
147static 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
158static 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
186exit_stop:
187 hid_hw_stop(hdev);
188exit:
189 return retval;
190}
191
192static void lua_remove(struct hid_device *hdev)
193{
194 lua_remove_specials(hdev);
195 hid_hw_stop(hdev);
196}
197
198static const struct hid_device_id lua_devices[] = {
199 { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_LUA) },
200 { }
201};
202
203MODULE_DEVICE_TABLE(hid, lua_devices);
204
205static struct hid_driver lua_driver = {
206 .name = "lua",
207 .id_table = lua_devices,
208 .probe = lua_probe,
209 .remove = lua_remove
210};
211module_hid_driver(lua_driver);
212
213MODULE_AUTHOR("Stefan Achatz");
214MODULE_DESCRIPTION("USB Roccat Lua driver");
215MODULE_LICENSE("GPL v2");