1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2000 Justin Cormack
4 */
5
6 /*
7 * Newton keyboard driver for Linux
8 */
9
10 #include <linux/slab.h>
11 #include <linux/module.h>
12 #include <linux/input.h>
13 #include <linux/serio.h>
14
15 #define DRIVER_DESC "Newton keyboard driver"
16
17 MODULE_AUTHOR("Justin Cormack <j.cormack@doc.ic.ac.uk>");
18 MODULE_DESCRIPTION(DRIVER_DESC);
19 MODULE_LICENSE("GPL");
20
21 #define NKBD_KEY 0x7f
22 #define NKBD_PRESS 0x80
23
24 static unsigned char nkbd_keycode[128] = {
25 KEY_A, KEY_S, KEY_D, KEY_F, KEY_H, KEY_G, KEY_Z, KEY_X,
26 KEY_C, KEY_V, 0, KEY_B, KEY_Q, KEY_W, KEY_E, KEY_R,
27 KEY_Y, KEY_T, KEY_1, KEY_2, KEY_3, KEY_4, KEY_6, KEY_5,
28 KEY_EQUAL, KEY_9, KEY_7, KEY_MINUS, KEY_8, KEY_0, KEY_RIGHTBRACE, KEY_O,
29 KEY_U, KEY_LEFTBRACE, KEY_I, KEY_P, KEY_ENTER, KEY_L, KEY_J, KEY_APOSTROPHE,
30 KEY_K, KEY_SEMICOLON, KEY_BACKSLASH, KEY_COMMA, KEY_SLASH, KEY_N, KEY_M, KEY_DOT,
31 KEY_TAB, KEY_SPACE, KEY_GRAVE, KEY_DELETE, 0, 0, 0, KEY_LEFTMETA,
32 KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_LEFTALT, KEY_LEFTCTRL, KEY_RIGHTSHIFT, 0, 0, 0,
33 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
34 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
35 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
36 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
37 KEY_LEFT, KEY_RIGHT, KEY_DOWN, KEY_UP, 0
38 };
39
40 struct nkbd {
41 unsigned char keycode[128];
42 struct input_dev *dev;
43 struct serio *serio;
44 char phys[32];
45 };
46
nkbd_interrupt(struct serio * serio,unsigned char data,unsigned int flags)47 static irqreturn_t nkbd_interrupt(struct serio *serio,
48 unsigned char data, unsigned int flags)
49 {
50 struct nkbd *nkbd = serio_get_drvdata(serio);
51
52 /* invalid scan codes are probably the init sequence, so we ignore them */
53 if (nkbd->keycode[data & NKBD_KEY]) {
54 input_report_key(nkbd->dev, nkbd->keycode[data & NKBD_KEY], data & NKBD_PRESS);
55 input_sync(nkbd->dev);
56 }
57
58 else if (data == 0xe7) /* end of init sequence */
59 printk(KERN_INFO "input: %s on %s\n", nkbd->dev->name, serio->phys);
60 return IRQ_HANDLED;
61
62 }
63
nkbd_connect(struct serio * serio,struct serio_driver * drv)64 static int nkbd_connect(struct serio *serio, struct serio_driver *drv)
65 {
66 struct nkbd *nkbd;
67 struct input_dev *input_dev;
68 int err = -ENOMEM;
69 int i;
70
71 nkbd = kzalloc(sizeof(struct nkbd), GFP_KERNEL);
72 input_dev = input_allocate_device();
73 if (!nkbd || !input_dev)
74 goto fail1;
75
76 nkbd->serio = serio;
77 nkbd->dev = input_dev;
78 snprintf(nkbd->phys, sizeof(nkbd->phys), "%s/input0", serio->phys);
79 memcpy(nkbd->keycode, nkbd_keycode, sizeof(nkbd->keycode));
80
81 input_dev->name = "Newton Keyboard";
82 input_dev->phys = nkbd->phys;
83 input_dev->id.bustype = BUS_RS232;
84 input_dev->id.vendor = SERIO_NEWTON;
85 input_dev->id.product = 0x0001;
86 input_dev->id.version = 0x0100;
87 input_dev->dev.parent = &serio->dev;
88
89 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
90 input_dev->keycode = nkbd->keycode;
91 input_dev->keycodesize = sizeof(unsigned char);
92 input_dev->keycodemax = ARRAY_SIZE(nkbd_keycode);
93 for (i = 0; i < 128; i++)
94 set_bit(nkbd->keycode[i], input_dev->keybit);
95 clear_bit(0, input_dev->keybit);
96
97 serio_set_drvdata(serio, nkbd);
98
99 err = serio_open(serio, drv);
100 if (err)
101 goto fail2;
102
103 err = input_register_device(nkbd->dev);
104 if (err)
105 goto fail3;
106
107 return 0;
108
109 fail3: serio_close(serio);
110 fail2: serio_set_drvdata(serio, NULL);
111 fail1: input_free_device(input_dev);
112 kfree(nkbd);
113 return err;
114 }
115
nkbd_disconnect(struct serio * serio)116 static void nkbd_disconnect(struct serio *serio)
117 {
118 struct nkbd *nkbd = serio_get_drvdata(serio);
119
120 serio_close(serio);
121 serio_set_drvdata(serio, NULL);
122 input_unregister_device(nkbd->dev);
123 kfree(nkbd);
124 }
125
126 static const struct serio_device_id nkbd_serio_ids[] = {
127 {
128 .type = SERIO_RS232,
129 .proto = SERIO_NEWTON,
130 .id = SERIO_ANY,
131 .extra = SERIO_ANY,
132 },
133 { 0 }
134 };
135
136 MODULE_DEVICE_TABLE(serio, nkbd_serio_ids);
137
138 static struct serio_driver nkbd_drv = {
139 .driver = {
140 .name = "newtonkbd",
141 },
142 .description = DRIVER_DESC,
143 .id_table = nkbd_serio_ids,
144 .interrupt = nkbd_interrupt,
145 .connect = nkbd_connect,
146 .disconnect = nkbd_disconnect,
147 };
148
149 module_serio_driver(nkbd_drv);
150