// SPDX-License-Identifier: GPL-2.0-or-later/* * Roccat Lua driver for Linux * * Copyright (c) 2012 Stefan Achatz <erazor_de@users.sourceforge.net> */ /* */ /* * Roccat Lua is a gamer mouse which cpi, button and light settings can be * configured. */ #include <linux/device.h>#include <linux/input.h>#include <linux/hid.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/hid-roccat.h>#include "hid-ids.h"#include "hid-roccat-common.h"#include "hid-roccat-lua.h" static ssize_t lua_sysfs_read(struct file *fp, struct kobject *kobj,		char *buf, loff_t off, size_t count,		size_t real_size, uint command){	struct device *dev = kobj_to_dev(kobj);	struct lua_device *lua = hid_get_drvdata(dev_get_drvdata(dev));	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));	int retval; 	if (off >= real_size)		return 0; 	if (off != 0 || count != real_size)		return -EINVAL; 	mutex_lock(&lua->lua_lock);	retval = roccat_common2_receive(usb_dev, command, buf, real_size);	mutex_unlock(&lua->lua_lock); 	return retval ? retval : real_size;} static ssize_t lua_sysfs_write(struct file *fp, struct kobject *kobj,		void const *buf, loff_t off, size_t count,		size_t real_size, uint command){	struct device *dev = kobj_to_dev(kobj);	struct lua_device *lua = hid_get_drvdata(dev_get_drvdata(dev));	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));	int retval; 	if (off != 0 || count != real_size)		return -EINVAL; 	mutex_lock(&lua->lua_lock);	retval = roccat_common2_send(usb_dev, command, buf, real_size);	mutex_unlock(&lua->lua_lock); 	return retval ? retval : real_size;} #define LUA_SYSFS_W(thingy, THINGY) \static ssize_t lua_sysfs_write_ ## thingy(struct file *fp, \		struct kobject *kobj, const struct bin_attribute *attr, \		char *buf, loff_t off, size_t count) \{ \	return lua_sysfs_write(fp, kobj, buf, off, count, \			LUA_SIZE_ ## THINGY, LUA_COMMAND_ ## THINGY); \} #define LUA_SYSFS_R(thingy, THINGY) \static ssize_t lua_sysfs_read_ ## thingy(struct file *fp, \		struct kobject *kobj, const struct bin_attribute *attr, \		char *buf, loff_t off, size_t count) \{ \	return lua_sysfs_read(fp, kobj, buf, off, count, \			LUA_SIZE_ ## THINGY, LUA_COMMAND_ ## THINGY); \} #define LUA_BIN_ATTRIBUTE_RW(thingy, THINGY) \LUA_SYSFS_W(thingy, THINGY) \LUA_SYSFS_R(thingy, THINGY) \static const struct bin_attribute lua_ ## thingy ## _attr = { \	.attr = { .name = #thingy, .mode = 0660 }, \	.size = LUA_SIZE_ ## THINGY, \	.read = lua_sysfs_read_ ## thingy, \	.write = lua_sysfs_write_ ## thingy \}; LUA_BIN_ATTRIBUTE_RW(control, CONTROL) static int lua_create_sysfs_attributes(struct usb_interface *intf){	return sysfs_create_bin_file(&intf->dev.kobj, &lua_control_attr);} static void lua_remove_sysfs_attributes(struct usb_interface *intf){	sysfs_remove_bin_file(&intf->dev.kobj, &lua_control_attr);} static int lua_init_lua_device_struct(struct usb_device *usb_dev,		struct lua_device *lua){	mutex_init(&lua->lua_lock); 	return 0;} static int lua_init_specials(struct hid_device *hdev){	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);	struct usb_device *usb_dev = interface_to_usbdev(intf);	struct lua_device *lua;	int retval; 	lua = kzalloc_obj(*lua);	if (!lua) {		hid_err(hdev, "can't alloc device descriptor\n");		return -ENOMEM;	}	hid_set_drvdata(hdev, lua); 	retval = lua_init_lua_device_struct(usb_dev, lua);	if (retval) {		hid_err(hdev, "couldn't init struct lua_device\n");		goto exit;	} 	retval = lua_create_sysfs_attributes(intf);	if (retval) {		hid_err(hdev, "cannot create sysfs files\n");		goto exit;	} 	return 0;exit:	kfree(lua);	return retval;} static void lua_remove_specials(struct hid_device *hdev){	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);	struct lua_device *lua; 	lua_remove_sysfs_attributes(intf); 	lua = hid_get_drvdata(hdev);	kfree(lua);} static int lua_probe(struct hid_device *hdev,		const struct hid_device_id *id){	int retval; 	if (!hid_is_usb(hdev))		return -EINVAL; 	retval = hid_parse(hdev);	if (retval) {		hid_err(hdev, "parse failed\n");		goto exit;	} 	retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);	if (retval) {		hid_err(hdev, "hw start failed\n");		goto exit;	} 	retval = lua_init_specials(hdev);	if (retval) {		hid_err(hdev, "couldn't install mouse\n");		goto exit_stop;	} 	return 0; exit_stop:	hid_hw_stop(hdev);exit:	return retval;} static void lua_remove(struct hid_device *hdev){	lua_remove_specials(hdev);	hid_hw_stop(hdev);} static const struct hid_device_id lua_devices[] = {	{ HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_LUA) },	{ }}; MODULE_DEVICE_TABLE(hid, lua_devices); static struct hid_driver lua_driver = {		.name = "lua",		.id_table = lua_devices,		.probe = lua_probe,		.remove = lua_remove};module_hid_driver(lua_driver); MODULE_AUTHOR("Stefan Achatz");MODULE_DESCRIPTION("USB Roccat Lua driver");MODULE_LICENSE("GPL v2");