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#include <linux/slab.h>
11#include <linux/module.h>
12#include <linux/input.h>
13#include <linux/serio.h>
14
15#define DRIVER_DESC	"Newton keyboard driver"
16
17MODULE_AUTHOR("Justin Cormack <j.cormack@doc.ic.ac.uk>");
18MODULE_DESCRIPTION(DRIVER_DESC);
19MODULE_LICENSE("GPL");
20
21#define NKBD_KEY	0x7f
22#define NKBD_PRESS	0x80
23
24static unsigned char nkbd_keycode[128] = {
25	KEY_A, KEY_S, KEY_D, KEY_F, KEY_H, KEY_G, KEY_Z, KEY_X,
26	KEY_C, KEY_V, 0, KEY_B, KEY_Q, KEY_W, KEY_E, KEY_R,
27	KEY_Y, KEY_T, KEY_1, KEY_2, KEY_3, KEY_4, KEY_6, KEY_5,
28	KEY_EQUAL, KEY_9, KEY_7, KEY_MINUS, KEY_8, KEY_0, KEY_RIGHTBRACE, KEY_O,
29	KEY_U, KEY_LEFTBRACE, KEY_I, KEY_P, KEY_ENTER, KEY_L, KEY_J, KEY_APOSTROPHE,
30	KEY_K, KEY_SEMICOLON, KEY_BACKSLASH, KEY_COMMA, KEY_SLASH, KEY_N, KEY_M, KEY_DOT,
31	KEY_TAB, KEY_SPACE, KEY_GRAVE, KEY_DELETE, 0, 0, 0, KEY_LEFTMETA,
32	KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_LEFTALT, KEY_LEFTCTRL, KEY_RIGHTSHIFT, 0, 0, 0,
33	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
34	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
35	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
36	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
37	KEY_LEFT, KEY_RIGHT, KEY_DOWN, KEY_UP, 0
38};
39
40struct nkbd {
41	unsigned char keycode[128];
42	struct input_dev *dev;
43	struct serio *serio;
44	char phys[32];
45};
46
47static irqreturn_t nkbd_interrupt(struct serio *serio,
48		unsigned char data, unsigned int flags)
49{
50	struct nkbd *nkbd = serio_get_drvdata(serio);
51
52	/* invalid scan codes are probably the init sequence, so we ignore them */
53	if (nkbd->keycode[data & NKBD_KEY]) {
54		input_report_key(nkbd->dev, nkbd->keycode[data & NKBD_KEY], data & NKBD_PRESS);
55		input_sync(nkbd->dev);
56	}
57
58	else if (data == 0xe7) /* end of init sequence */
59		printk(KERN_INFO "input: %s on %s\n", nkbd->dev->name, serio->phys);
60	return IRQ_HANDLED;
61
62}
63
64static int nkbd_connect(struct serio *serio, struct serio_driver *drv)
65{
66	struct nkbd *nkbd;
67	struct input_dev *input_dev;
68	int err = -ENOMEM;
69	int i;
70
71	nkbd = kzalloc(sizeof(struct nkbd), GFP_KERNEL);
72	input_dev = input_allocate_device();
73	if (!nkbd || !input_dev)
74		goto fail1;
75
76	nkbd->serio = serio;
77	nkbd->dev = input_dev;
78	snprintf(nkbd->phys, sizeof(nkbd->phys), "%s/input0", serio->phys);
79	memcpy(nkbd->keycode, nkbd_keycode, sizeof(nkbd->keycode));
80
81	input_dev->name = "Newton Keyboard";
82	input_dev->phys = nkbd->phys;
83	input_dev->id.bustype = BUS_RS232;
84	input_dev->id.vendor = SERIO_NEWTON;
85	input_dev->id.product = 0x0001;
86	input_dev->id.version = 0x0100;
87	input_dev->dev.parent = &serio->dev;
88
89	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
90	input_dev->keycode = nkbd->keycode;
91	input_dev->keycodesize = sizeof(unsigned char);
92	input_dev->keycodemax = ARRAY_SIZE(nkbd_keycode);
93	for (i = 0; i < 128; i++)
94		set_bit(nkbd->keycode[i], input_dev->keybit);
95	clear_bit(0, input_dev->keybit);
96
97	serio_set_drvdata(serio, nkbd);
98
99	err = serio_open(serio, drv);
100	if (err)
101		goto fail2;
102
103	err = input_register_device(nkbd->dev);
104	if (err)
105		goto fail3;
106
107	return 0;
108
109 fail3:	serio_close(serio);
110 fail2:	serio_set_drvdata(serio, NULL);
111 fail1:	input_free_device(input_dev);
112	kfree(nkbd);
113	return err;
114}
115
116static void nkbd_disconnect(struct serio *serio)
117{
118	struct nkbd *nkbd = serio_get_drvdata(serio);
119
120	serio_close(serio);
121	serio_set_drvdata(serio, NULL);
122	input_unregister_device(nkbd->dev);
123	kfree(nkbd);
124}
125
126static const struct serio_device_id nkbd_serio_ids[] = {
127	{
128		.type	= SERIO_RS232,
129		.proto	= SERIO_NEWTON,
130		.id	= SERIO_ANY,
131		.extra	= SERIO_ANY,
132	},
133	{ 0 }
134};
135
136MODULE_DEVICE_TABLE(serio, nkbd_serio_ids);
137
138static struct serio_driver nkbd_drv = {
139	.driver		= {
140		.name	= "newtonkbd",
141	},
142	.description	= DRIVER_DESC,
143	.id_table	= nkbd_serio_ids,
144	.interrupt	= nkbd_interrupt,
145	.connect	= nkbd_connect,
146	.disconnect	= nkbd_disconnect,
147};
148
149module_serio_driver(nkbd_drv);
150