Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / hid / hid-roccat-lua.c
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
29 static 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
51 static 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, (void *)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) \
71 static 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) \
80 static 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) \
89 LUA_SYSFS_W(thingy, THINGY) \
90 LUA_SYSFS_R(thingy, THINGY) \
91 static 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
98 LUA_BIN_ATTRIBUTE_RW(control, CONTROL)
99
100 static int lua_create_sysfs_attributes(struct usb_interface *intf)
101 {
102         return sysfs_create_bin_file(&intf->dev.kobj, &lua_control_attr);
103 }
104
105 static void lua_remove_sysfs_attributes(struct usb_interface *intf)
106 {
107         sysfs_remove_bin_file(&intf->dev.kobj, &lua_control_attr);
108 }
109
110 static 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
118 static 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;
145 exit:
146         kfree(lua);
147         return retval;
148 }
149
150 static 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
161 static 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
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
212 static int __init lua_init(void)
213 {
214         return hid_register_driver(&lua_driver);
215 }
216
217 static void __exit lua_exit(void)
218 {
219         hid_unregister_driver(&lua_driver);
220 }
221
222 module_init(lua_init);
223 module_exit(lua_exit);
224
225 MODULE_AUTHOR("Stefan Achatz");
226 MODULE_DESCRIPTION("USB Roccat Lua driver");
227 MODULE_LICENSE("GPL v2");