linux/drivers/hid/hid-roccat-lua.c
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   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, (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) \
  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};
 211
 212static int __init lua_init(void)
 213{
 214        return hid_register_driver(&lua_driver);
 215}
 216
 217static void __exit lua_exit(void)
 218{
 219        hid_unregister_driver(&lua_driver);
 220}
 221
 222module_init(lua_init);
 223module_exit(lua_exit);
 224
 225MODULE_AUTHOR("Stefan Achatz");
 226MODULE_DESCRIPTION("USB Roccat Lua driver");
 227MODULE_LICENSE("GPL v2");
 228
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