1/*
2 * Stowaway keyboard driver for Linux
3 */
4
5/*
6 *  Copyright (c) 2006 Marek Vasut
7 *
8 *  Based on Newton keyboard driver for Linux
9 *  by Justin Cormack
10 */
11
12/*
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 *
27 * Should you need to contact me, the author, you can do so either by
28 * e-mail - mail your message to <marek.vasut@gmail.com>, or by paper mail:
29 * Marek Vasut, Liskovecka 559, Frydek-Mistek, 738 01 Czech Republic
30 */
31
32#include <linux/slab.h>
33#include <linux/module.h>
34#include <linux/input.h>
35#include <linux/init.h>
36#include <linux/serio.h>
37
38#define DRIVER_DESC	"Stowaway keyboard driver"
39
40MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
41MODULE_DESCRIPTION(DRIVER_DESC);
42MODULE_LICENSE("GPL");
43
44#define SKBD_KEY_MASK	0x7f
45#define SKBD_RELEASE	0x80
46
47static unsigned char skbd_keycode[128] = {
48	KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,
49	0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,
50	KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,
51	KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,
52	0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,
53	0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,
54	KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,
55	KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,
56	KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,
57	KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,
58	KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT,  0, 0, 0,
59	KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,
60	0, 0, 0, 0, 0, 0, 0, 0,
61	0, 0, 0, 0, 0, 0, 0, 0,
62	0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,
63	KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0
64};
65
66struct skbd {
67	unsigned char keycode[128];
68	struct input_dev *dev;
69	struct serio *serio;
70	char phys[32];
71};
72
73static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
74				  unsigned int flags)
75{
76	struct skbd *skbd = serio_get_drvdata(serio);
77	struct input_dev *dev = skbd->dev;
78
79	if (skbd->keycode[data & SKBD_KEY_MASK]) {
80		input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
81				 !(data & SKBD_RELEASE));
82		input_sync(dev);
83	}
84
85	return IRQ_HANDLED;
86}
87
88static int skbd_connect(struct serio *serio, struct serio_driver *drv)
89{
90	struct skbd *skbd;
91	struct input_dev *input_dev;
92	int err = -ENOMEM;
93	int i;
94
95	skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL);
96	input_dev = input_allocate_device();
97	if (!skbd || !input_dev)
98		goto fail1;
99
100	skbd->serio = serio;
101	skbd->dev = input_dev;
102	snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys);
103	memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));
104
105	input_dev->name = "Stowaway Keyboard";
106	input_dev->phys = skbd->phys;
107	input_dev->id.bustype = BUS_RS232;
108	input_dev->id.vendor = SERIO_STOWAWAY;
109	input_dev->id.product = 0x0001;
110	input_dev->id.version = 0x0100;
111	input_dev->dev.parent = &serio->dev;
112
113	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
114	input_dev->keycode = skbd->keycode;
115	input_dev->keycodesize = sizeof(unsigned char);
116	input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
117	for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
118		set_bit(skbd_keycode[i], input_dev->keybit);
119	clear_bit(0, input_dev->keybit);
120
121	serio_set_drvdata(serio, skbd);
122
123	err = serio_open(serio, drv);
124	if (err)
125		goto fail2;
126
127	err = input_register_device(skbd->dev);
128	if (err)
129		goto fail3;
130
131	return 0;
132
133 fail3: serio_close(serio);
134 fail2:	serio_set_drvdata(serio, NULL);
135 fail1:	input_free_device(input_dev);
136	kfree(skbd);
137	return err;
138}
139
140static void skbd_disconnect(struct serio *serio)
141{
142	struct skbd *skbd = serio_get_drvdata(serio);
143
144	serio_close(serio);
145	serio_set_drvdata(serio, NULL);
146	input_unregister_device(skbd->dev);
147	kfree(skbd);
148}
149
150static struct serio_device_id skbd_serio_ids[] = {
151	{
152		.type	= SERIO_RS232,
153		.proto	= SERIO_STOWAWAY,
154		.id	= SERIO_ANY,
155		.extra	= SERIO_ANY,
156	},
157	{ 0 }
158};
159
160MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
161
162static struct serio_driver skbd_drv = {
163	.driver		= {
164		.name	= "stowaway",
165	},
166	.description	= DRIVER_DESC,
167	.id_table	= skbd_serio_ids,
168	.interrupt	= skbd_interrupt,
169	.connect	= skbd_connect,
170	.disconnect	= skbd_disconnect,
171};
172
173static int __init skbd_init(void)
174{
175	return serio_register_driver(&skbd_drv);
176}
177
178static void __exit skbd_exit(void)
179{
180	serio_unregister_driver(&skbd_drv);
181}
182
183module_init(skbd_init);
184module_exit(skbd_exit);
185