drivers/hid/hid-retrode.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HID driver for Retrode 2 controller adapter and plug-in extensions
   4  *
   5  *  Copyright (c) 2017 Bastien Nocera <hadess@hadess.net>
   6  */
   7
   8 /*
   9  */
  10
  11 #include <linux/input.h>
  12 #include <linux/slab.h>
  13 #include <linux/hid.h>
  14 #include <linux/module.h>
  15 #include "hid-ids.h"
  16
  17 #define CONTROLLER_NAME_BASE "Retrode"
  18
  19 static int retrode_input_configured(struct hid_device *hdev,
  20                                         struct hid_input *hi)
  21 {
  22         struct hid_field *field = hi->report->field[0];
  23         const char *suffix;
  24         int number = 0;
  25         char *name;
  26
  27         switch (field->report->id) {
  28         case 0:
  29                 suffix = "SNES Mouse";
  30                 break;
  31         case 1:
  32         case 2:
  33                 suffix = "SNES / N64";
  34                 number = field->report->id;
  35                 break;
  36         case 3:
  37         case 4:
  38                 suffix = "Mega Drive";
  39                 number = field->report->id - 2;
  40                 break;
  41         default:
  42                 hid_err(hdev, "Got unhandled report id %d\n", field->report->id);
  43                 suffix = "Unknown";
  44         }
  45
  46         if (number)
  47                 name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  48                                 "%s %s #%d", CONTROLLER_NAME_BASE,
  49                                 suffix, number);
  50         else
  51                 name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  52                                 "%s %s", CONTROLLER_NAME_BASE, suffix);
  53
  54         if (!name)
  55                 return -ENOMEM;
  56
  57         hi->input->name = name;
  58
  59         return 0;
  60 }
  61
  62 static int retrode_probe(struct hid_device *hdev,
  63                         const struct hid_device_id *id)
  64 {
  65
  66         int ret;
  67
  68         /* Has no effect on the mouse device */
  69         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
  70
  71         ret = hid_parse(hdev);
  72         if (ret)
  73                 return ret;
  74
  75         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  76         if (ret)
  77                 return ret;
  78
  79         return 0;
  80 }
  81
  82 static const struct hid_device_id retrode_devices[] = {
  83         { HID_USB_DEVICE(USB_VENDOR_ID_FUTURE_TECHNOLOGY, USB_DEVICE_ID_RETRODE2) },
  84         { }
  85 };
  86 MODULE_DEVICE_TABLE(hid, retrode_devices);
  87
  88 static struct hid_driver retrode_driver = {
  89         .name             = "hid-retrode",
  90         .id_table         = retrode_devices,
  91         .input_configured = retrode_input_configured,
  92         .probe            = retrode_probe,
  93 };
  94
  95 module_hid_driver(retrode_driver);
  96
  97 MODULE_LICENSE("GPL");