drivers/hid/hid-retrode.c

   1 /*
   2  *  HID driver for Retrode 2 controller adapter and plug-in extensions
   3  *
   4  *  Copyright (c) 2017 Bastien Nocera <[email protected]>
   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 #include <linux/input.h>
  15 #include <linux/slab.h>
  16 #include <linux/hid.h>
  17 #include <linux/module.h>
  18 #include "hid-ids.h"
  19
  20 #define CONTROLLER_NAME_BASE "Retrode"
  21
  22 static int retrode_input_configured(struct hid_device *hdev,
  23                                         struct hid_input *hi)
  24 {
  25         struct hid_field *field = hi->report->field[0];
  26         const char *suffix;
  27         int number = 0;
  28         char *name;
  29
  30         switch (field->report->id) {
  31         case 0:
  32                 suffix = "SNES Mouse";
  33                 break;
  34         case 1:
  35         case 2:
  36                 suffix = "SNES / N64";
  37                 number = field->report->id;
  38                 break;
  39         case 3:
  40         case 4:
  41                 suffix = "Mega Drive";
  42                 number = field->report->id - 2;
  43                 break;
  44         default:
  45                 hid_err(hdev, "Got unhandled report id %d\n", field->report->id);
  46                 suffix = "Unknown";
  47         }
  48
  49         if (number)
  50                 name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  51                                 "%s %s #%d", CONTROLLER_NAME_BASE,
  52                                 suffix, number);
  53         else
  54                 name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  55                                 "%s %s", CONTROLLER_NAME_BASE, suffix);
  56
  57         if (!name)
  58                 return -ENOMEM;
  59
  60         hi->input->name = name;
  61
  62         return 0;
  63 }
  64
  65 static int retrode_probe(struct hid_device *hdev,
  66                         const struct hid_device_id *id)
  67 {
  68
  69         int ret;
  70
  71         /* Has no effect on the mouse device */
  72         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
  73
  74         ret = hid_parse(hdev);
  75         if (ret)
  76                 return ret;
  77
  78         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  79         if (ret)
  80                 return ret;
  81
  82         return 0;
  83 }
  84
  85 static const struct hid_device_id retrode_devices[] = {
  86         { HID_USB_DEVICE(USB_VENDOR_ID_FUTURE_TECHNOLOGY, USB_DEVICE_ID_RETRODE2) },
  87         { }
  88 };
  89 MODULE_DEVICE_TABLE(hid, retrode_devices);
  90
  91 static struct hid_driver retrode_driver = {
  92         .name             = "hid-retrode",
  93         .id_table         = retrode_devices,
  94         .input_configured = retrode_input_configured,
  95         .probe            = retrode_probe,
  96 };
  97
  98 module_hid_driver(retrode_driver);
  99
 100 MODULE_LICENSE("GPL");