cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xtkbd.c (3706B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Copyright (c) 1999-2001 Vojtech Pavlik
      4 */
      5
      6/*
      7 * XT keyboard driver for Linux
      8 */
      9
     10/*
     11 */
     12
     13#include <linux/slab.h>
     14#include <linux/module.h>
     15#include <linux/input.h>
     16#include <linux/serio.h>
     17
     18#define DRIVER_DESC	"XT keyboard driver"
     19
     20MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
     21MODULE_DESCRIPTION(DRIVER_DESC);
     22MODULE_LICENSE("GPL");
     23
     24#define XTKBD_EMUL0	0xe0
     25#define XTKBD_EMUL1	0xe1
     26#define XTKBD_KEY	0x7f
     27#define XTKBD_RELEASE	0x80
     28
     29static unsigned char xtkbd_keycode[256] = {
     30	  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
     31	 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
     32	 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
     33	 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
     34	 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
     35	 80, 81, 82, 83,  0,  0,  0, 87, 88,  0,  0,  0,  0,  0,  0,  0,
     36	  0,  0,  0,  0,  0, 87, 88,  0,  0,  0,  0,110,111,103,108,105,
     37	106
     38};
     39
     40struct xtkbd {
     41	unsigned char keycode[256];
     42	struct input_dev *dev;
     43	struct serio *serio;
     44	char phys[32];
     45};
     46
     47static irqreturn_t xtkbd_interrupt(struct serio *serio,
     48	unsigned char data, unsigned int flags)
     49{
     50	struct xtkbd *xtkbd = serio_get_drvdata(serio);
     51
     52	switch (data) {
     53		case XTKBD_EMUL0:
     54		case XTKBD_EMUL1:
     55			break;
     56		default:
     57
     58			if (xtkbd->keycode[data & XTKBD_KEY]) {
     59				input_report_key(xtkbd->dev, xtkbd->keycode[data & XTKBD_KEY], !(data & XTKBD_RELEASE));
     60				input_sync(xtkbd->dev);
     61			} else {
     62				printk(KERN_WARNING "xtkbd.c: Unknown key (scancode %#x) %s.\n",
     63					data & XTKBD_KEY, data & XTKBD_RELEASE ? "released" : "pressed");
     64			}
     65	}
     66	return IRQ_HANDLED;
     67}
     68
     69static int xtkbd_connect(struct serio *serio, struct serio_driver *drv)
     70{
     71	struct xtkbd *xtkbd;
     72	struct input_dev *input_dev;
     73	int err = -ENOMEM;
     74	int i;
     75
     76	xtkbd = kmalloc(sizeof(struct xtkbd), GFP_KERNEL);
     77	input_dev = input_allocate_device();
     78	if (!xtkbd || !input_dev)
     79		goto fail1;
     80
     81	xtkbd->serio = serio;
     82	xtkbd->dev = input_dev;
     83	snprintf(xtkbd->phys, sizeof(xtkbd->phys), "%s/input0", serio->phys);
     84	memcpy(xtkbd->keycode, xtkbd_keycode, sizeof(xtkbd->keycode));
     85
     86	input_dev->name = "XT Keyboard";
     87	input_dev->phys = xtkbd->phys;
     88	input_dev->id.bustype = BUS_XTKBD;
     89	input_dev->id.vendor  = 0x0001;
     90	input_dev->id.product = 0x0001;
     91	input_dev->id.version = 0x0100;
     92	input_dev->dev.parent = &serio->dev;
     93
     94	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
     95	input_dev->keycode = xtkbd->keycode;
     96	input_dev->keycodesize = sizeof(unsigned char);
     97	input_dev->keycodemax = ARRAY_SIZE(xtkbd_keycode);
     98
     99	for (i = 0; i < 255; i++)
    100		set_bit(xtkbd->keycode[i], input_dev->keybit);
    101	clear_bit(0, input_dev->keybit);
    102
    103	serio_set_drvdata(serio, xtkbd);
    104
    105	err = serio_open(serio, drv);
    106	if (err)
    107		goto fail2;
    108
    109	err = input_register_device(xtkbd->dev);
    110	if (err)
    111		goto fail3;
    112
    113	return 0;
    114
    115 fail3:	serio_close(serio);
    116 fail2:	serio_set_drvdata(serio, NULL);
    117 fail1:	input_free_device(input_dev);
    118	kfree(xtkbd);
    119	return err;
    120}
    121
    122static void xtkbd_disconnect(struct serio *serio)
    123{
    124	struct xtkbd *xtkbd = serio_get_drvdata(serio);
    125
    126	serio_close(serio);
    127	serio_set_drvdata(serio, NULL);
    128	input_unregister_device(xtkbd->dev);
    129	kfree(xtkbd);
    130}
    131
    132static const struct serio_device_id xtkbd_serio_ids[] = {
    133	{
    134		.type	= SERIO_XT,
    135		.proto	= SERIO_ANY,
    136		.id	= SERIO_ANY,
    137		.extra	= SERIO_ANY,
    138	},
    139	{ 0 }
    140};
    141
    142MODULE_DEVICE_TABLE(serio, xtkbd_serio_ids);
    143
    144static struct serio_driver xtkbd_drv = {
    145	.driver		= {
    146		.name	= "xtkbd",
    147	},
    148	.description	= DRIVER_DESC,
    149	.id_table	= xtkbd_serio_ids,
    150	.interrupt	= xtkbd_interrupt,
    151	.connect	= xtkbd_connect,
    152	.disconnect	= xtkbd_disconnect,
    153};
    154
    155module_serio_driver(xtkbd_drv);