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/*
11 */
12
13#include <linux/slab.h>
14#include <linux/module.h>
15#include <linux/input.h>
16#include <linux/serio.h>
17
18#define DRIVER_DESC	"XT keyboard driver"
19
20MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
21MODULE_DESCRIPTION(DRIVER_DESC);
22MODULE_LICENSE("GPL");
23
24#define XTKBD_EMUL0	0xe0
25#define XTKBD_EMUL1	0xe1
26#define XTKBD_KEY	0x7f
27#define XTKBD_RELEASE	0x80
28
29static unsigned char xtkbd_keycode[256] = {
30	  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
31	 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32	 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
33	 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
34	 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
35	 80, 81, 82, 83,  0,  0,  0, 87, 88,  0,  0,  0,  0,  0,  0,  0,
36	  0,  0,  0,  0,  0, 87, 88,  0,  0,  0,  0,110,111,103,108,105,
37	106
38};
39
40struct xtkbd {
41	unsigned char keycode[256];
42	struct input_dev *dev;
43	struct serio *serio;
44	char phys[32];
45};
46
47static irqreturn_t xtkbd_interrupt(struct serio *serio,
48	unsigned char data, unsigned int flags)
49{
50	struct xtkbd *xtkbd = serio_get_drvdata(serio);
51
52	switch (data) {
53		case XTKBD_EMUL0:
54		case XTKBD_EMUL1:
55			break;
56		default:
57
58			if (xtkbd->keycode[data & XTKBD_KEY]) {
59				input_report_key(xtkbd->dev, xtkbd->keycode[data & XTKBD_KEY], !(data & XTKBD_RELEASE));
60				input_sync(xtkbd->dev);
61			} else {
62				printk(KERN_WARNING "xtkbd.c: Unknown key (scancode %#x) %s.\n",
63					data & XTKBD_KEY, data & XTKBD_RELEASE ? "released" : "pressed");
64			}
65	}
66	return IRQ_HANDLED;
67}
68
69static int xtkbd_connect(struct serio *serio, struct serio_driver *drv)
70{
71	struct xtkbd *xtkbd;
72	struct input_dev *input_dev;
73	int err = -ENOMEM;
74	int i;
75
76	xtkbd = kmalloc(sizeof(struct xtkbd), GFP_KERNEL);
77	input_dev = input_allocate_device();
78	if (!xtkbd || !input_dev)
79		goto fail1;
80
81	xtkbd->serio = serio;
82	xtkbd->dev = input_dev;
83	snprintf(xtkbd->phys, sizeof(xtkbd->phys), "%s/input0", serio->phys);
84	memcpy(xtkbd->keycode, xtkbd_keycode, sizeof(xtkbd->keycode));
85
86	input_dev->name = "XT Keyboard";
87	input_dev->phys = xtkbd->phys;
88	input_dev->id.bustype = BUS_XTKBD;
89	input_dev->id.vendor  = 0x0001;
90	input_dev->id.product = 0x0001;
91	input_dev->id.version = 0x0100;
92	input_dev->dev.parent = &serio->dev;
93
94	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
95	input_dev->keycode = xtkbd->keycode;
96	input_dev->keycodesize = sizeof(unsigned char);
97	input_dev->keycodemax = ARRAY_SIZE(xtkbd_keycode);
98
99	for (i = 0; i < 255; i++)
100		set_bit(xtkbd->keycode[i], input_dev->keybit);
101	clear_bit(0, input_dev->keybit);
102
103	serio_set_drvdata(serio, xtkbd);
104
105	err = serio_open(serio, drv);
106	if (err)
107		goto fail2;
108
109	err = input_register_device(xtkbd->dev);
110	if (err)
111		goto fail3;
112
113	return 0;
114
115 fail3:	serio_close(serio);
116 fail2:	serio_set_drvdata(serio, NULL);
117 fail1:	input_free_device(input_dev);
118	kfree(xtkbd);
119	return err;
120}
121
122static void xtkbd_disconnect(struct serio *serio)
123{
124	struct xtkbd *xtkbd = serio_get_drvdata(serio);
125
126	serio_close(serio);
127	serio_set_drvdata(serio, NULL);
128	input_unregister_device(xtkbd->dev);
129	kfree(xtkbd);
130}
131
132static const struct serio_device_id xtkbd_serio_ids[] = {
133	{
134		.type	= SERIO_XT,
135		.proto	= SERIO_ANY,
136		.id	= SERIO_ANY,
137		.extra	= SERIO_ANY,
138	},
139	{ 0 }
140};
141
142MODULE_DEVICE_TABLE(serio, xtkbd_serio_ids);
143
144static struct serio_driver xtkbd_drv = {
145	.driver		= {
146		.name	= "xtkbd",
147	},
148	.description	= DRIVER_DESC,
149	.id_table	= xtkbd_serio_ids,
150	.interrupt	= xtkbd_interrupt,
151	.connect	= xtkbd_connect,
152	.disconnect	= xtkbd_disconnect,
153};
154
155module_serio_driver(xtkbd_drv);
156