1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Stowaway keyboard driver for Linux
4 */
5
6/*
7 *  Copyright (c) 2006 Marek Vasut
8 *
9 *  Based on Newton keyboard driver for Linux
10 *  by Justin Cormack
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	"Stowaway keyboard driver"
19
20MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
21MODULE_DESCRIPTION(DRIVER_DESC);
22MODULE_LICENSE("GPL");
23
24#define SKBD_KEY_MASK	0x7f
25#define SKBD_RELEASE	0x80
26
27static unsigned char skbd_keycode[128] = {
28	KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,
29	0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,
30	KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,
31	KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,
32	0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,
33	0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,
34	KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,
35	KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,
36	KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,
37	KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,
38	KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT,  0, 0, 0,
39	KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,
40	0, 0, 0, 0, 0, 0, 0, 0,
41	0, 0, 0, 0, 0, 0, 0, 0,
42	0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,
43	KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0
44};
45
46struct skbd {
47	unsigned char keycode[128];
48	struct input_dev *dev;
49	struct serio *serio;
50	char phys[32];
51};
52
53static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
54				  unsigned int flags)
55{
56	struct skbd *skbd = serio_get_drvdata(serio);
57	struct input_dev *dev = skbd->dev;
58
59	if (skbd->keycode[data & SKBD_KEY_MASK]) {
60		input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
61				 !(data & SKBD_RELEASE));
62		input_sync(dev);
63	}
64
65	return IRQ_HANDLED;
66}
67
68static int skbd_connect(struct serio *serio, struct serio_driver *drv)
69{
70	struct skbd *skbd;
71	struct input_dev *input_dev;
72	int err = -ENOMEM;
73	int i;
74
75	skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL);
76	input_dev = input_allocate_device();
77	if (!skbd || !input_dev)
78		goto fail1;
79
80	skbd->serio = serio;
81	skbd->dev = input_dev;
82	snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys);
83	memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));
84
85	input_dev->name = "Stowaway Keyboard";
86	input_dev->phys = skbd->phys;
87	input_dev->id.bustype = BUS_RS232;
88	input_dev->id.vendor = SERIO_STOWAWAY;
89	input_dev->id.product = 0x0001;
90	input_dev->id.version = 0x0100;
91	input_dev->dev.parent = &serio->dev;
92
93	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
94	input_dev->keycode = skbd->keycode;
95	input_dev->keycodesize = sizeof(unsigned char);
96	input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
97	for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
98		set_bit(skbd_keycode[i], input_dev->keybit);
99	clear_bit(0, input_dev->keybit);
100
101	serio_set_drvdata(serio, skbd);
102
103	err = serio_open(serio, drv);
104	if (err)
105		goto fail2;
106
107	err = input_register_device(skbd->dev);
108	if (err)
109		goto fail3;
110
111	return 0;
112
113 fail3: serio_close(serio);
114 fail2:	serio_set_drvdata(serio, NULL);
115 fail1:	input_free_device(input_dev);
116	kfree(skbd);
117	return err;
118}
119
120static void skbd_disconnect(struct serio *serio)
121{
122	struct skbd *skbd = serio_get_drvdata(serio);
123
124	serio_close(serio);
125	serio_set_drvdata(serio, NULL);
126	input_unregister_device(skbd->dev);
127	kfree(skbd);
128}
129
130static const struct serio_device_id skbd_serio_ids[] = {
131	{
132		.type	= SERIO_RS232,
133		.proto	= SERIO_STOWAWAY,
134		.id	= SERIO_ANY,
135		.extra	= SERIO_ANY,
136	},
137	{ 0 }
138};
139
140MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
141
142static struct serio_driver skbd_drv = {
143	.driver		= {
144		.name	= "stowaway",
145	},
146	.description	= DRIVER_DESC,
147	.id_table	= skbd_serio_ids,
148	.interrupt	= skbd_interrupt,
149	.connect	= skbd_connect,
150	.disconnect	= skbd_disconnect,
151};
152
153module_serio_driver(skbd_drv);
154