1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Copyright (c) 2000 Justin Cormack
4 */
5
6/*
7 * Newton 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	"Newton keyboard driver"
19
20MODULE_AUTHOR("Justin Cormack <j.cormack@doc.ic.ac.uk>");
21MODULE_DESCRIPTION(DRIVER_DESC);
22MODULE_LICENSE("GPL");
23
24#define NKBD_KEY	0x7f
25#define NKBD_PRESS	0x80
26
27static unsigned char nkbd_keycode[128] = {
28	KEY_A, KEY_S, KEY_D, KEY_F, KEY_H, KEY_G, KEY_Z, KEY_X,
29	KEY_C, KEY_V, 0, KEY_B, KEY_Q, KEY_W, KEY_E, KEY_R,
30	KEY_Y, KEY_T, KEY_1, KEY_2, KEY_3, KEY_4, KEY_6, KEY_5,
31	KEY_EQUAL, KEY_9, KEY_7, KEY_MINUS, KEY_8, KEY_0, KEY_RIGHTBRACE, KEY_O,
32	KEY_U, KEY_LEFTBRACE, KEY_I, KEY_P, KEY_ENTER, KEY_L, KEY_J, KEY_APOSTROPHE,
33	KEY_K, KEY_SEMICOLON, KEY_BACKSLASH, KEY_COMMA, KEY_SLASH, KEY_N, KEY_M, KEY_DOT,
34	KEY_TAB, KEY_SPACE, KEY_GRAVE, KEY_DELETE, 0, 0, 0, KEY_LEFTMETA,
35	KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_LEFTALT, KEY_LEFTCTRL, KEY_RIGHTSHIFT, 0, 0, 0,
36	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
37	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
38	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
39	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
40	KEY_LEFT, KEY_RIGHT, KEY_DOWN, KEY_UP, 0
41};
42
43struct nkbd {
44	unsigned char keycode[128];
45	struct input_dev *dev;
46	struct serio *serio;
47	char phys[32];
48};
49
50static irqreturn_t nkbd_interrupt(struct serio *serio,
51		unsigned char data, unsigned int flags)
52{
53	struct nkbd *nkbd = serio_get_drvdata(serio);
54
55	/* invalid scan codes are probably the init sequence, so we ignore them */
56	if (nkbd->keycode[data & NKBD_KEY]) {
57		input_report_key(nkbd->dev, nkbd->keycode[data & NKBD_KEY], data & NKBD_PRESS);
58		input_sync(nkbd->dev);
59	}
60
61	else if (data == 0xe7) /* end of init sequence */
62		printk(KERN_INFO "input: %s on %s\n", nkbd->dev->name, serio->phys);
63	return IRQ_HANDLED;
64
65}
66
67static int nkbd_connect(struct serio *serio, struct serio_driver *drv)
68{
69	struct nkbd *nkbd;
70	struct input_dev *input_dev;
71	int err = -ENOMEM;
72	int i;
73
74	nkbd = kzalloc(sizeof(struct nkbd), GFP_KERNEL);
75	input_dev = input_allocate_device();
76	if (!nkbd || !input_dev)
77		goto fail1;
78
79	nkbd->serio = serio;
80	nkbd->dev = input_dev;
81	snprintf(nkbd->phys, sizeof(nkbd->phys), "%s/input0", serio->phys);
82	memcpy(nkbd->keycode, nkbd_keycode, sizeof(nkbd->keycode));
83
84	input_dev->name = "Newton Keyboard";
85	input_dev->phys = nkbd->phys;
86	input_dev->id.bustype = BUS_RS232;
87	input_dev->id.vendor = SERIO_NEWTON;
88	input_dev->id.product = 0x0001;
89	input_dev->id.version = 0x0100;
90	input_dev->dev.parent = &serio->dev;
91
92	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
93	input_dev->keycode = nkbd->keycode;
94	input_dev->keycodesize = sizeof(unsigned char);
95	input_dev->keycodemax = ARRAY_SIZE(nkbd_keycode);
96	for (i = 0; i < 128; i++)
97		set_bit(nkbd->keycode[i], input_dev->keybit);
98	clear_bit(0, input_dev->keybit);
99
100	serio_set_drvdata(serio, nkbd);
101
102	err = serio_open(serio, drv);
103	if (err)
104		goto fail2;
105
106	err = input_register_device(nkbd->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(nkbd);
116	return err;
117}
118
119static void nkbd_disconnect(struct serio *serio)
120{
121	struct nkbd *nkbd = serio_get_drvdata(serio);
122
123	serio_close(serio);
124	serio_set_drvdata(serio, NULL);
125	input_unregister_device(nkbd->dev);
126	kfree(nkbd);
127}
128
129static const struct serio_device_id nkbd_serio_ids[] = {
130	{
131		.type	= SERIO_RS232,
132		.proto	= SERIO_NEWTON,
133		.id	= SERIO_ANY,
134		.extra	= SERIO_ANY,
135	},
136	{ 0 }
137};
138
139MODULE_DEVICE_TABLE(serio, nkbd_serio_ids);
140
141static struct serio_driver nkbd_drv = {
142	.driver		= {
143		.name	= "newtonkbd",
144	},
145	.description	= DRIVER_DESC,
146	.id_table	= nkbd_serio_ids,
147	.interrupt	= nkbd_interrupt,
148	.connect	= nkbd_connect,
149	.disconnect	= nkbd_disconnect,
150};
151
152module_serio_driver(nkbd_drv);
153