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
19static 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
62static 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
82static const struct hid_device_id retrode_devices[] = {
83	{ HID_USB_DEVICE(USB_VENDOR_ID_FUTURE_TECHNOLOGY, USB_DEVICE_ID_RETRODE2) },
84	{ }
85};
86MODULE_DEVICE_TABLE(hid, retrode_devices);
87
88static 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
95module_hid_driver(retrode_driver);
96
97MODULE_LICENSE("GPL");
98