xref: /openbmc/linux/drivers/hid/hid-retrode.c (revision 2874c5fd)
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 
retrode_input_configured(struct hid_device * hdev,struct hid_input * hi)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 
retrode_probe(struct hid_device * hdev,const struct hid_device_id * id)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");
98