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 = 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
  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 = 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) \
  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 module_hid_driver(lua_driver);
 212
 213 MODULE_AUTHOR("Stefan Achatz");
 214 MODULE_DESCRIPTION("USB Roccat Lua driver");
 215 MODULE_LICENSE("GPL v2");