1 /*
2  *  Copyright (c) 2000 Justin Cormack
3  */
4 
5 /*
6  * Newton keyboard driver for Linux
7  */
8 
9 /*
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23  *
24  * Should you need to contact me, the author, you can do so either by
25  * e-mail - mail your message to <j.cormack@doc.ic.ac.uk>, or by paper mail:
26  * Justin Cormack, 68 Dartmouth Park Road, London NW5 1SN, UK.
27  */
28 
29 #include <linux/slab.h>
30 #include <linux/module.h>
31 #include <linux/input.h>
32 #include <linux/serio.h>
33 
34 #define DRIVER_DESC	"Newton keyboard driver"
35 
36 MODULE_AUTHOR("Justin Cormack <j.cormack@doc.ic.ac.uk>");
37 MODULE_DESCRIPTION(DRIVER_DESC);
38 MODULE_LICENSE("GPL");
39 
40 #define NKBD_KEY	0x7f
41 #define NKBD_PRESS	0x80
42 
43 static unsigned char nkbd_keycode[128] = {
44 	KEY_A, KEY_S, KEY_D, KEY_F, KEY_H, KEY_G, KEY_Z, KEY_X,
45 	KEY_C, KEY_V, 0, KEY_B, KEY_Q, KEY_W, KEY_E, KEY_R,
46 	KEY_Y, KEY_T, KEY_1, KEY_2, KEY_3, KEY_4, KEY_6, KEY_5,
47 	KEY_EQUAL, KEY_9, KEY_7, KEY_MINUS, KEY_8, KEY_0, KEY_RIGHTBRACE, KEY_O,
48 	KEY_U, KEY_LEFTBRACE, KEY_I, KEY_P, KEY_ENTER, KEY_L, KEY_J, KEY_APOSTROPHE,
49 	KEY_K, KEY_SEMICOLON, KEY_BACKSLASH, KEY_COMMA, KEY_SLASH, KEY_N, KEY_M, KEY_DOT,
50 	KEY_TAB, KEY_SPACE, KEY_GRAVE, KEY_DELETE, 0, 0, 0, KEY_LEFTMETA,
51 	KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_LEFTALT, KEY_LEFTCTRL, KEY_RIGHTSHIFT, 0, 0, 0,
52 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
53 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
54 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56 	KEY_LEFT, KEY_RIGHT, KEY_DOWN, KEY_UP, 0
57 };
58 
59 struct nkbd {
60 	unsigned char keycode[128];
61 	struct input_dev *dev;
62 	struct serio *serio;
63 	char phys[32];
64 };
65 
66 static irqreturn_t nkbd_interrupt(struct serio *serio,
67 		unsigned char data, unsigned int flags)
68 {
69 	struct nkbd *nkbd = serio_get_drvdata(serio);
70 
71 	/* invalid scan codes are probably the init sequence, so we ignore them */
72 	if (nkbd->keycode[data & NKBD_KEY]) {
73 		input_report_key(nkbd->dev, nkbd->keycode[data & NKBD_KEY], data & NKBD_PRESS);
74 		input_sync(nkbd->dev);
75 	}
76 
77 	else if (data == 0xe7) /* end of init sequence */
78 		printk(KERN_INFO "input: %s on %s\n", nkbd->dev->name, serio->phys);
79 	return IRQ_HANDLED;
80 
81 }
82 
83 static int nkbd_connect(struct serio *serio, struct serio_driver *drv)
84 {
85 	struct nkbd *nkbd;
86 	struct input_dev *input_dev;
87 	int err = -ENOMEM;
88 	int i;
89 
90 	nkbd = kzalloc(sizeof(struct nkbd), GFP_KERNEL);
91 	input_dev = input_allocate_device();
92 	if (!nkbd || !input_dev)
93 		goto fail1;
94 
95 	nkbd->serio = serio;
96 	nkbd->dev = input_dev;
97 	snprintf(nkbd->phys, sizeof(nkbd->phys), "%s/input0", serio->phys);
98 	memcpy(nkbd->keycode, nkbd_keycode, sizeof(nkbd->keycode));
99 
100 	input_dev->name = "Newton Keyboard";
101 	input_dev->phys = nkbd->phys;
102 	input_dev->id.bustype = BUS_RS232;
103 	input_dev->id.vendor = SERIO_NEWTON;
104 	input_dev->id.product = 0x0001;
105 	input_dev->id.version = 0x0100;
106 	input_dev->dev.parent = &serio->dev;
107 
108 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
109 	input_dev->keycode = nkbd->keycode;
110 	input_dev->keycodesize = sizeof(unsigned char);
111 	input_dev->keycodemax = ARRAY_SIZE(nkbd_keycode);
112 	for (i = 0; i < 128; i++)
113 		set_bit(nkbd->keycode[i], input_dev->keybit);
114 	clear_bit(0, input_dev->keybit);
115 
116 	serio_set_drvdata(serio, nkbd);
117 
118 	err = serio_open(serio, drv);
119 	if (err)
120 		goto fail2;
121 
122 	err = input_register_device(nkbd->dev);
123 	if (err)
124 		goto fail3;
125 
126 	return 0;
127 
128  fail3:	serio_close(serio);
129  fail2:	serio_set_drvdata(serio, NULL);
130  fail1:	input_free_device(input_dev);
131 	kfree(nkbd);
132 	return err;
133 }
134 
135 static void nkbd_disconnect(struct serio *serio)
136 {
137 	struct nkbd *nkbd = serio_get_drvdata(serio);
138 
139 	serio_close(serio);
140 	serio_set_drvdata(serio, NULL);
141 	input_unregister_device(nkbd->dev);
142 	kfree(nkbd);
143 }
144 
145 static struct serio_device_id nkbd_serio_ids[] = {
146 	{
147 		.type	= SERIO_RS232,
148 		.proto	= SERIO_NEWTON,
149 		.id	= SERIO_ANY,
150 		.extra	= SERIO_ANY,
151 	},
152 	{ 0 }
153 };
154 
155 MODULE_DEVICE_TABLE(serio, nkbd_serio_ids);
156 
157 static struct serio_driver nkbd_drv = {
158 	.driver		= {
159 		.name	= "newtonkbd",
160 	},
161 	.description	= DRIVER_DESC,
162 	.id_table	= nkbd_serio_ids,
163 	.interrupt	= nkbd_interrupt,
164 	.connect	= nkbd_connect,
165 	.disconnect	= nkbd_disconnect,
166 };
167 
168 module_serio_driver(nkbd_drv);
169