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 | |
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(hdev: 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, report_id: command, data: buf, size: real_size); |
43 | mutex_unlock(lock: &lua->lua_lock); |
44 | |
45 | return retval ? retval : real_size; |
46 | } |
47 | |
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(hdev: 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, report_id: command, data: buf, size: real_size); |
62 | mutex_unlock(lock: &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 | |
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(kobj: &intf->dev.kobj, attr: &lua_control_attr); |
100 | } |
101 | |
102 | static void lua_remove_sysfs_attributes(struct usb_interface *intf) |
103 | { |
104 | sysfs_remove_bin_file(kobj: &intf->dev.kobj, attr: &lua_control_attr); |
105 | } |
106 | |
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 | |
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(size: 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, data: 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(objp: lua); |
144 | return retval; |
145 | } |
146 | |
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(objp: lua); |
156 | } |
157 | |
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 | |
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 | |