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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Roccat Lua driver for Linux4 *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 be13 * 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_remove210};211module_hid_driver(lua_driver);212 213MODULE_AUTHOR("Stefan Achatz");214MODULE_DESCRIPTION("USB Roccat Lua driver");215MODULE_LICENSE("GPL v2");216