drivers/hid/hid-roccat-lua.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Roccat Lua driver for Linux
   4  *
   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 be
  13  * 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
  26 static 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
  48 static 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) \
  68 static 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) \
  77 static 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) \
  86 LUA_SYSFS_W(thingy, THINGY) \
  87 LUA_SYSFS_R(thingy, THINGY) \
  88 static 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
  95 LUA_BIN_ATTRIBUTE_RW(control, CONTROL)
  96
  97 static int lua_create_sysfs_attributes(struct usb_interface *intf)
  98 {
  99         return sysfs_create_bin_file(&intf->dev.kobj, &lua_control_attr);
 100 }
 101
 102 static void lua_remove_sysfs_attributes(struct usb_interface *intf)
 103 {
 104         sysfs_remove_bin_file(&intf->dev.kobj, &lua_control_attr);
 105 }
 106
 107 static 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
 115 static 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;
 142 exit:
 143         kfree(lua);
 144         return retval;
 145 }
 146
 147 static 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
 158 static int lua_probe(struct hid_device *hdev,
 159                 const struct hid_device_id *id)
 160 {
 161         int retval;
 162
 163         retval = hid_parse(hdev);
 164         if (retval) {
 165                 hid_err(hdev, "parse failed\n");
 166                 goto exit;
 167         }
 168
 169         retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 170         if (retval) {
 171                 hid_err(hdev, "hw start failed\n");
 172                 goto exit;
 173         }
 174
 175         retval = lua_init_specials(hdev);
 176         if (retval) {
 177                 hid_err(hdev, "couldn't install mouse\n");
 178                 goto exit_stop;
 179         }
 180
 181         return 0;
 182
 183 exit_stop:
 184         hid_hw_stop(hdev);
 185 exit:
 186         return retval;
 187 }
 188
 189 static void lua_remove(struct hid_device *hdev)
 190 {
 191         lua_remove_specials(hdev);
 192         hid_hw_stop(hdev);
 193 }
 194
 195 static const struct hid_device_id lua_devices[] = {
 196         { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_LUA) },
 197         { }
 198 };
 199
 200 MODULE_DEVICE_TABLE(hid, lua_devices);
 201
 202 static struct hid_driver lua_driver = {
 203                 .name = "lua",
 204                 .id_table = lua_devices,
 205                 .probe = lua_probe,
 206                 .remove = lua_remove
 207 };
 208 module_hid_driver(lua_driver);
 209
 210 MODULE_AUTHOR("Stefan Achatz");
 211 MODULE_DESCRIPTION("USB Roccat Lua driver");
 212 MODULE_LICENSE("GPL v2");