newtonkbd.c

  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
 17MODULE_AUTHOR("Justin Cormack <j.cormack@doc.ic.ac.uk>");
 18MODULE_DESCRIPTION(DRIVER_DESC);
 19MODULE_LICENSE("GPL");
 20
 21#define NKBD_KEY	0x7f
 22#define NKBD_PRESS	0x80
 23
 24static 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
 40struct nkbd {
 41	unsigned char keycode[128];
 42	struct input_dev *dev;
 43	struct serio *serio;
 44	char phys[32];
 45};
 46
 47static 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
 64static 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(*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
116static 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
126static 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
136MODULE_DEVICE_TABLE(serio, nkbd_serio_ids);
137
138static 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
149module_serio_driver(nkbd_drv);