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 = container_of(kobj, struct device, 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 = container_of(kobj, struct device, 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