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 
40 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
41 MODULE_DESCRIPTION(DRIVER_DESC);
42 MODULE_LICENSE("GPL");
43 
44 #define SKBD_KEY_MASK	0x7f
45 #define SKBD_RELEASE	0x80
46 
47 static 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 
66 struct skbd {
67 	unsigned char keycode[128];
68 	struct input_dev *dev;
69 	struct serio *serio;
70 	char phys[32];
71 };
72 
73 static 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 
88 static 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_MASK(EV_KEY) | BIT_MASK(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 
140 static 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 
150 static 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 
160 MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
161 
162 static 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 
173 static int __init skbd_init(void)
174 {
175 	return serio_register_driver(&skbd_drv);
176 }
177 
178 static void __exit skbd_exit(void)
179 {
180 	serio_unregister_driver(&skbd_drv);
181 }
182 
183 module_init(skbd_init);
184 module_exit(skbd_exit);
185