xref: /openbmc/linux/drivers/hid/hid-roccat-lua.c (revision a579510a)
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 
lua_sysfs_read(struct file * fp,struct kobject * kobj,char * buf,loff_t off,size_t count,size_t real_size,uint command)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(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 
lua_sysfs_write(struct file * fp,struct kobject * kobj,void const * buf,loff_t off,size_t count,size_t real_size,uint command)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(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) \
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 
LUA_BIN_ATTRIBUTE_RW(control,CONTROL)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(&intf->dev.kobj, &lua_control_attr);
100 }
101 
lua_remove_sysfs_attributes(struct usb_interface * intf)102 static void lua_remove_sysfs_attributes(struct usb_interface *intf)
103 {
104 	sysfs_remove_bin_file(&intf->dev.kobj, &lua_control_attr);
105 }
106 
lua_init_lua_device_struct(struct usb_device * usb_dev,struct lua_device * lua)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 
lua_init_specials(struct hid_device * hdev)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(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;
142 exit:
143 	kfree(lua);
144 	return retval;
145 }
146 
lua_remove_specials(struct hid_device * hdev)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(lua);
156 }
157 
lua_probe(struct hid_device * hdev,const struct hid_device_id * id)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 
lua_remove(struct hid_device * hdev)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