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
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, 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, 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 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(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;
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");
216