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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stowaway.c (3954B)

      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
     23MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
     24MODULE_DESCRIPTION(DRIVER_DESC);
     25MODULE_LICENSE("GPL");
     26
     27#define SKBD_KEY_MASK	0x7f
     28#define SKBD_RELEASE	0x80
     29
     30static 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
     49struct skbd {
     50	unsigned char keycode[128];
     51	struct input_dev *dev;
     52	struct serio *serio;
     53	char phys[32];
     54};
     55
     56static 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
     71static 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
    123static 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
    133static 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
    143MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
    144
    145static 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
    156module_serio_driver(skbd_drv);