1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Stowaway keyboard driver for Linux
4 */
5
6 /*
7 * Copyright (c) 2006 Marek Vasut
8 *
9 * Based on Newton keyboard driver for Linux
10 * by Justin Cormack
11 */
12
13 /*
14 */
15
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/input.h>
19 #include <linux/serio.h>
20
21 #define DRIVER_DESC "Stowaway keyboard driver"
22
23 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
24 MODULE_DESCRIPTION(DRIVER_DESC);
25 MODULE_LICENSE("GPL");
26
27 #define SKBD_KEY_MASK 0x7f
28 #define SKBD_RELEASE 0x80
29
30 static unsigned char skbd_keycode[128] = {
31 KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,
32 0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,
33 KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,
34 KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,
35 0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,
36 0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,
37 KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,
38 KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,
39 KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,
40 KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,
41 KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0,
42 KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,
43 0, 0, 0, 0, 0, 0, 0, 0,
44 0, 0, 0, 0, 0, 0, 0, 0,
45 0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,
46 KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0
47 };
48
49 struct skbd {
50 unsigned char keycode[128];
51 struct input_dev *dev;
52 struct serio *serio;
53 char phys[32];
54 };
55
skbd_interrupt(struct serio * serio,unsigned char data,unsigned int flags)56 static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
57 unsigned int flags)
58 {
59 struct skbd *skbd = serio_get_drvdata(serio);
60 struct input_dev *dev = skbd->dev;
61
62 if (skbd->keycode[data & SKBD_KEY_MASK]) {
63 input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
64 !(data & SKBD_RELEASE));
65 input_sync(dev);
66 }
67
68 return IRQ_HANDLED;
69 }
70
skbd_connect(struct serio * serio,struct serio_driver * drv)71 static int skbd_connect(struct serio *serio, struct serio_driver *drv)
72 {
73 struct skbd *skbd;
74 struct input_dev *input_dev;
75 int err = -ENOMEM;
76 int i;
77
78 skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL);
79 input_dev = input_allocate_device();
80 if (!skbd || !input_dev)
81 goto fail1;
82
83 skbd->serio = serio;
84 skbd->dev = input_dev;
85 snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys);
86 memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));
87
88 input_dev->name = "Stowaway Keyboard";
89 input_dev->phys = skbd->phys;
90 input_dev->id.bustype = BUS_RS232;
91 input_dev->id.vendor = SERIO_STOWAWAY;
92 input_dev->id.product = 0x0001;
93 input_dev->id.version = 0x0100;
94 input_dev->dev.parent = &serio->dev;
95
96 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
97 input_dev->keycode = skbd->keycode;
98 input_dev->keycodesize = sizeof(unsigned char);
99 input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
100 for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
101 set_bit(skbd_keycode[i], input_dev->keybit);
102 clear_bit(0, input_dev->keybit);
103
104 serio_set_drvdata(serio, skbd);
105
106 err = serio_open(serio, drv);
107 if (err)
108 goto fail2;
109
110 err = input_register_device(skbd->dev);
111 if (err)
112 goto fail3;
113
114 return 0;
115
116 fail3: serio_close(serio);
117 fail2: serio_set_drvdata(serio, NULL);
118 fail1: input_free_device(input_dev);
119 kfree(skbd);
120 return err;
121 }
122
skbd_disconnect(struct serio * serio)123 static void skbd_disconnect(struct serio *serio)
124 {
125 struct skbd *skbd = serio_get_drvdata(serio);
126
127 serio_close(serio);
128 serio_set_drvdata(serio, NULL);
129 input_unregister_device(skbd->dev);
130 kfree(skbd);
131 }
132
133 static const struct serio_device_id skbd_serio_ids[] = {
134 {
135 .type = SERIO_RS232,
136 .proto = SERIO_STOWAWAY,
137 .id = SERIO_ANY,
138 .extra = SERIO_ANY,
139 },
140 { 0 }
141 };
142
143 MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
144
145 static struct serio_driver skbd_drv = {
146 .driver = {
147 .name = "stowaway",
148 },
149 .description = DRIVER_DESC,
150 .id_table = skbd_serio_ids,
151 .interrupt = skbd_interrupt,
152 .connect = skbd_connect,
153 .disconnect = skbd_disconnect,
154 };
155
156 module_serio_driver(skbd_drv);
157
