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/serio.h>
36 
37 #define DRIVER_DESC	"Stowaway keyboard driver"
38 
39 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
40 MODULE_DESCRIPTION(DRIVER_DESC);
41 MODULE_LICENSE("GPL");
42 
43 #define SKBD_KEY_MASK	0x7f
44 #define SKBD_RELEASE	0x80
45 
46 static unsigned char skbd_keycode[128] = {
47 	KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,
48 	0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,
49 	KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,
50 	KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,
51 	0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,
52 	0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,
53 	KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,
54 	KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,
55 	KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,
56 	KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,
57 	KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT,  0, 0, 0,
58 	KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,
59 	0, 0, 0, 0, 0, 0, 0, 0,
60 	0, 0, 0, 0, 0, 0, 0, 0,
61 	0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,
62 	KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0
63 };
64 
65 struct skbd {
66 	unsigned char keycode[128];
67 	struct input_dev *dev;
68 	struct serio *serio;
69 	char phys[32];
70 };
71 
72 static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
73 				  unsigned int flags)
74 {
75 	struct skbd *skbd = serio_get_drvdata(serio);
76 	struct input_dev *dev = skbd->dev;
77 
78 	if (skbd->keycode[data & SKBD_KEY_MASK]) {
79 		input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
80 				 !(data & SKBD_RELEASE));
81 		input_sync(dev);
82 	}
83 
84 	return IRQ_HANDLED;
85 }
86 
87 static int skbd_connect(struct serio *serio, struct serio_driver *drv)
88 {
89 	struct skbd *skbd;
90 	struct input_dev *input_dev;
91 	int err = -ENOMEM;
92 	int i;
93 
94 	skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL);
95 	input_dev = input_allocate_device();
96 	if (!skbd || !input_dev)
97 		goto fail1;
98 
99 	skbd->serio = serio;
100 	skbd->dev = input_dev;
101 	snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys);
102 	memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));
103 
104 	input_dev->name = "Stowaway Keyboard";
105 	input_dev->phys = skbd->phys;
106 	input_dev->id.bustype = BUS_RS232;
107 	input_dev->id.vendor = SERIO_STOWAWAY;
108 	input_dev->id.product = 0x0001;
109 	input_dev->id.version = 0x0100;
110 	input_dev->dev.parent = &serio->dev;
111 
112 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
113 	input_dev->keycode = skbd->keycode;
114 	input_dev->keycodesize = sizeof(unsigned char);
115 	input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
116 	for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
117 		set_bit(skbd_keycode[i], input_dev->keybit);
118 	clear_bit(0, input_dev->keybit);
119 
120 	serio_set_drvdata(serio, skbd);
121 
122 	err = serio_open(serio, drv);
123 	if (err)
124 		goto fail2;
125 
126 	err = input_register_device(skbd->dev);
127 	if (err)
128 		goto fail3;
129 
130 	return 0;
131 
132  fail3: serio_close(serio);
133  fail2:	serio_set_drvdata(serio, NULL);
134  fail1:	input_free_device(input_dev);
135 	kfree(skbd);
136 	return err;
137 }
138 
139 static void skbd_disconnect(struct serio *serio)
140 {
141 	struct skbd *skbd = serio_get_drvdata(serio);
142 
143 	serio_close(serio);
144 	serio_set_drvdata(serio, NULL);
145 	input_unregister_device(skbd->dev);
146 	kfree(skbd);
147 }
148 
149 static struct serio_device_id skbd_serio_ids[] = {
150 	{
151 		.type	= SERIO_RS232,
152 		.proto	= SERIO_STOWAWAY,
153 		.id	= SERIO_ANY,
154 		.extra	= SERIO_ANY,
155 	},
156 	{ 0 }
157 };
158 
159 MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
160 
161 static struct serio_driver skbd_drv = {
162 	.driver		= {
163 		.name	= "stowaway",
164 	},
165 	.description	= DRIVER_DESC,
166 	.id_table	= skbd_serio_ids,
167 	.interrupt	= skbd_interrupt,
168 	.connect	= skbd_connect,
169 	.disconnect	= skbd_disconnect,
170 };
171 
172 module_serio_driver(skbd_drv);
173