1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Copyright (c) 1999-2001 Vojtech Pavlik
4 */
5
6/*
7 * XT keyboard driver for Linux
8 */
9
10#include <linux/slab.h>
11#include <linux/module.h>
12#include <linux/input.h>
13#include <linux/serio.h>
14
15#define DRIVER_DESC	"XT keyboard driver"
16
17MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
18MODULE_DESCRIPTION(DRIVER_DESC);
19MODULE_LICENSE("GPL");
20
21#define XTKBD_EMUL0	0xe0
22#define XTKBD_EMUL1	0xe1
23#define XTKBD_KEY	0x7f
24#define XTKBD_RELEASE	0x80
25
26static unsigned char xtkbd_keycode[256] = {
27	  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
28	 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
29	 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
30	 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
31	 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
32	 80, 81, 82, 83,  0,  0,  0, 87, 88,  0,  0,  0,  0,  0,  0,  0,
33	  0,  0,  0,  0,  0, 87, 88,  0,  0,  0,  0,110,111,103,108,105,
34	106
35};
36
37struct xtkbd {
38	unsigned char keycode[256];
39	struct input_dev *dev;
40	struct serio *serio;
41	char phys[32];
42};
43
44static irqreturn_t xtkbd_interrupt(struct serio *serio,
45	unsigned char data, unsigned int flags)
46{
47	struct xtkbd *xtkbd = serio_get_drvdata(serio);
48
49	switch (data) {
50		case XTKBD_EMUL0:
51		case XTKBD_EMUL1:
52			break;
53		default:
54
55			if (xtkbd->keycode[data & XTKBD_KEY]) {
56				input_report_key(xtkbd->dev, xtkbd->keycode[data & XTKBD_KEY], !(data & XTKBD_RELEASE));
57				input_sync(xtkbd->dev);
58			} else {
59				printk(KERN_WARNING "xtkbd.c: Unknown key (scancode %#x) %s.\n",
60					data & XTKBD_KEY, data & XTKBD_RELEASE ? "released" : "pressed");
61			}
62	}
63	return IRQ_HANDLED;
64}
65
66static int xtkbd_connect(struct serio *serio, struct serio_driver *drv)
67{
68	struct xtkbd *xtkbd;
69	struct input_dev *input_dev;
70	int err = -ENOMEM;
71	int i;
72
73	xtkbd = kmalloc(sizeof(struct xtkbd), GFP_KERNEL);
74	input_dev = input_allocate_device();
75	if (!xtkbd || !input_dev)
76		goto fail1;
77
78	xtkbd->serio = serio;
79	xtkbd->dev = input_dev;
80	snprintf(xtkbd->phys, sizeof(xtkbd->phys), "%s/input0", serio->phys);
81	memcpy(xtkbd->keycode, xtkbd_keycode, sizeof(xtkbd->keycode));
82
83	input_dev->name = "XT Keyboard";
84	input_dev->phys = xtkbd->phys;
85	input_dev->id.bustype = BUS_XTKBD;
86	input_dev->id.vendor  = 0x0001;
87	input_dev->id.product = 0x0001;
88	input_dev->id.version = 0x0100;
89	input_dev->dev.parent = &serio->dev;
90
91	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
92	input_dev->keycode = xtkbd->keycode;
93	input_dev->keycodesize = sizeof(unsigned char);
94	input_dev->keycodemax = ARRAY_SIZE(xtkbd_keycode);
95
96	for (i = 0; i < 255; i++)
97		set_bit(xtkbd->keycode[i], input_dev->keybit);
98	clear_bit(0, input_dev->keybit);
99
100	serio_set_drvdata(serio, xtkbd);
101
102	err = serio_open(serio, drv);
103	if (err)
104		goto fail2;
105
106	err = input_register_device(xtkbd->dev);
107	if (err)
108		goto fail3;
109
110	return 0;
111
112 fail3:	serio_close(serio);
113 fail2:	serio_set_drvdata(serio, NULL);
114 fail1:	input_free_device(input_dev);
115	kfree(xtkbd);
116	return err;
117}
118
119static void xtkbd_disconnect(struct serio *serio)
120{
121	struct xtkbd *xtkbd = serio_get_drvdata(serio);
122
123	serio_close(serio);
124	serio_set_drvdata(serio, NULL);
125	input_unregister_device(xtkbd->dev);
126	kfree(xtkbd);
127}
128
129static const struct serio_device_id xtkbd_serio_ids[] = {
130	{
131		.type	= SERIO_XT,
132		.proto	= SERIO_ANY,
133		.id	= SERIO_ANY,
134		.extra	= SERIO_ANY,
135	},
136	{ 0 }
137};
138
139MODULE_DEVICE_TABLE(serio, xtkbd_serio_ids);
140
141static struct serio_driver xtkbd_drv = {
142	.driver		= {
143		.name	= "xtkbd",
144	},
145	.description	= DRIVER_DESC,
146	.id_table	= xtkbd_serio_ids,
147	.interrupt	= xtkbd_interrupt,
148	.connect	= xtkbd_connect,
149	.disconnect	= xtkbd_disconnect,
150};
151
152module_serio_driver(xtkbd_drv);
153