1/*
2 * Roccat Lua driver for Linux
3 *
4 * Copyright (c) 2012 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/*
15 * Roccat Lua is a gamer mouse which cpi, button and light settings can be
16 * configured.
17 */
18
19#include <linux/device.h>
20#include <linux/input.h>
21#include <linux/hid.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24#include <linux/hid-roccat.h>
25#include "hid-ids.h"
26#include "hid-roccat-common.h"
27#include "hid-roccat-lua.h"
28
29static ssize_t lua_sysfs_read(struct file *fp, struct kobject *kobj,
30 char *buf, loff_t off, size_t count,
31 size_t real_size, uint command)
32{
33 struct device *dev = kobj_to_dev(kobj);
34 struct lua_device *lua = hid_get_drvdata(dev_get_drvdata(dev));
35 struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
36 int retval;
37
38 if (off >= real_size)
39 return 0;
40
41 if (off != 0 || count != real_size)
42 return -EINVAL;
43
44 mutex_lock(&lua->lua_lock);
45 retval = roccat_common2_receive(usb_dev, command, buf, real_size);
46 mutex_unlock(&lua->lua_lock);
47
48 return retval ? retval : real_size;
49}
50
51static ssize_t lua_sysfs_write(struct file *fp, struct kobject *kobj,
52 void const *buf, loff_t off, size_t count,
53 size_t real_size, uint command)
54{
55 struct device *dev = kobj_to_dev(kobj);
56 struct lua_device *lua = hid_get_drvdata(dev_get_drvdata(dev));
57 struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
58 int retval;
59
60 if (off != 0 || count != real_size)
61 return -EINVAL;
62
63 mutex_lock(&lua->lua_lock);
64 retval = roccat_common2_send(usb_dev, command, buf, real_size);
65 mutex_unlock(&lua->lua_lock);
66
67 return retval ? retval : real_size;
68}
69
70#define LUA_SYSFS_W(thingy, THINGY) \
71static ssize_t lua_sysfs_write_ ## thingy(struct file *fp, \
72 struct kobject *kobj, struct bin_attribute *attr, \
73 char *buf, loff_t off, size_t count) \
74{ \
75 return lua_sysfs_write(fp, kobj, buf, off, count, \
76 LUA_SIZE_ ## THINGY, LUA_COMMAND_ ## THINGY); \
77}
78
79#define LUA_SYSFS_R(thingy, THINGY) \
80static ssize_t lua_sysfs_read_ ## thingy(struct file *fp, \
81 struct kobject *kobj, struct bin_attribute *attr, \
82 char *buf, loff_t off, size_t count) \
83{ \
84 return lua_sysfs_read(fp, kobj, buf, off, count, \
85 LUA_SIZE_ ## THINGY, LUA_COMMAND_ ## THINGY); \
86}
87
88#define LUA_BIN_ATTRIBUTE_RW(thingy, THINGY) \
89LUA_SYSFS_W(thingy, THINGY) \
90LUA_SYSFS_R(thingy, THINGY) \
91static struct bin_attribute lua_ ## thingy ## _attr = { \
92 .attr = { .name = #thingy, .mode = 0660 }, \
93 .size = LUA_SIZE_ ## THINGY, \
94 .read = lua_sysfs_read_ ## thingy, \
95 .write = lua_sysfs_write_ ## thingy \
96};
97
98LUA_BIN_ATTRIBUTE_RW(control, CONTROL)
99
100static int lua_create_sysfs_attributes(struct usb_interface *intf)
101{
102 return sysfs_create_bin_file(&intf->dev.kobj, &lua_control_attr);
103}
104
105static void lua_remove_sysfs_attributes(struct usb_interface *intf)
106{
107 sysfs_remove_bin_file(&intf->dev.kobj, &lua_control_attr);
108}
109
110static int lua_init_lua_device_struct(struct usb_device *usb_dev,
111 struct lua_device *lua)
112{
113 mutex_init(&lua->lua_lock);
114
115 return 0;
116}
117
118static int lua_init_specials(struct hid_device *hdev)
119{
120 struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
121 struct usb_device *usb_dev = interface_to_usbdev(intf);
122 struct lua_device *lua;
123 int retval;
124
125 lua = kzalloc(sizeof(*lua), GFP_KERNEL);
126 if (!lua) {
127 hid_err(hdev, "can't alloc device descriptor\n");
128 return -ENOMEM;
129 }
130 hid_set_drvdata(hdev, lua);
131
132 retval = lua_init_lua_device_struct(usb_dev, lua);
133 if (retval) {
134 hid_err(hdev, "couldn't init struct lua_device\n");
135 goto exit;
136 }
137
138 retval = lua_create_sysfs_attributes(intf);
139 if (retval) {
140 hid_err(hdev, "cannot create sysfs files\n");
141 goto exit;
142 }
143
144 return 0;
145exit:
146 kfree(lua);
147 return retval;
148}
149
150static void lua_remove_specials(struct hid_device *hdev)
151{
152 struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
153 struct lua_device *lua;
154
155 lua_remove_sysfs_attributes(intf);
156
157 lua = hid_get_drvdata(hdev);
158 kfree(lua);
159}
160
161static int lua_probe(struct hid_device *hdev,
162 const struct hid_device_id *id)
163{
164 int retval;
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");
216