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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touchright.c (3815B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Touchright serial touchscreen driver
      4 *
      5 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
      6 *
      7 * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
      8 * Copyright (c) 2004 Vojtech Pavlik
      9 * and Dan Streetman <ddstreet@ieee.org>
     10 */
     11
     12
     13#include <linux/errno.h>
     14#include <linux/kernel.h>
     15#include <linux/module.h>
     16#include <linux/slab.h>
     17#include <linux/input.h>
     18#include <linux/serio.h>
     19
     20#define DRIVER_DESC	"Touchright serial touchscreen driver"
     21
     22MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
     23MODULE_DESCRIPTION(DRIVER_DESC);
     24MODULE_LICENSE("GPL");
     25
     26/*
     27 * Definitions & global arrays.
     28 */
     29
     30#define TR_FORMAT_TOUCH_BIT	0x01
     31#define TR_FORMAT_STATUS_BYTE	0x40
     32#define TR_FORMAT_STATUS_MASK	~TR_FORMAT_TOUCH_BIT
     33
     34#define TR_LENGTH 5
     35
     36#define TR_MIN_XC 0
     37#define TR_MAX_XC 0x1ff
     38#define TR_MIN_YC 0
     39#define TR_MAX_YC 0x1ff
     40
     41/*
     42 * Per-touchscreen data.
     43 */
     44
     45struct tr {
     46	struct input_dev *dev;
     47	struct serio *serio;
     48	int idx;
     49	unsigned char data[TR_LENGTH];
     50	char phys[32];
     51};
     52
     53static irqreturn_t tr_interrupt(struct serio *serio,
     54		unsigned char data, unsigned int flags)
     55{
     56	struct tr *tr = serio_get_drvdata(serio);
     57	struct input_dev *dev = tr->dev;
     58
     59	tr->data[tr->idx] = data;
     60
     61	if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
     62		if (++tr->idx == TR_LENGTH) {
     63			input_report_abs(dev, ABS_X,
     64				(tr->data[1] << 5) | (tr->data[2] >> 1));
     65			input_report_abs(dev, ABS_Y,
     66				(tr->data[3] << 5) | (tr->data[4] >> 1));
     67			input_report_key(dev, BTN_TOUCH,
     68				tr->data[0] & TR_FORMAT_TOUCH_BIT);
     69			input_sync(dev);
     70			tr->idx = 0;
     71		}
     72	}
     73
     74	return IRQ_HANDLED;
     75}
     76
     77/*
     78 * tr_disconnect() is the opposite of tr_connect()
     79 */
     80
     81static void tr_disconnect(struct serio *serio)
     82{
     83	struct tr *tr = serio_get_drvdata(serio);
     84
     85	input_get_device(tr->dev);
     86	input_unregister_device(tr->dev);
     87	serio_close(serio);
     88	serio_set_drvdata(serio, NULL);
     89	input_put_device(tr->dev);
     90	kfree(tr);
     91}
     92
     93/*
     94 * tr_connect() is the routine that is called when someone adds a
     95 * new serio device that supports the Touchright protocol and registers it as
     96 * an input device.
     97 */
     98
     99static int tr_connect(struct serio *serio, struct serio_driver *drv)
    100{
    101	struct tr *tr;
    102	struct input_dev *input_dev;
    103	int err;
    104
    105	tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
    106	input_dev = input_allocate_device();
    107	if (!tr || !input_dev) {
    108		err = -ENOMEM;
    109		goto fail1;
    110	}
    111
    112	tr->serio = serio;
    113	tr->dev = input_dev;
    114	snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
    115
    116	input_dev->name = "Touchright Serial TouchScreen";
    117	input_dev->phys = tr->phys;
    118	input_dev->id.bustype = BUS_RS232;
    119	input_dev->id.vendor = SERIO_TOUCHRIGHT;
    120	input_dev->id.product = 0;
    121	input_dev->id.version = 0x0100;
    122	input_dev->dev.parent = &serio->dev;
    123	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
    124	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
    125	input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
    126	input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
    127
    128	serio_set_drvdata(serio, tr);
    129
    130	err = serio_open(serio, drv);
    131	if (err)
    132		goto fail2;
    133
    134	err = input_register_device(tr->dev);
    135	if (err)
    136		goto fail3;
    137
    138	return 0;
    139
    140 fail3:	serio_close(serio);
    141 fail2:	serio_set_drvdata(serio, NULL);
    142 fail1:	input_free_device(input_dev);
    143	kfree(tr);
    144	return err;
    145}
    146
    147/*
    148 * The serio driver structure.
    149 */
    150
    151static const struct serio_device_id tr_serio_ids[] = {
    152	{
    153		.type	= SERIO_RS232,
    154		.proto	= SERIO_TOUCHRIGHT,
    155		.id	= SERIO_ANY,
    156		.extra	= SERIO_ANY,
    157	},
    158	{ 0 }
    159};
    160
    161MODULE_DEVICE_TABLE(serio, tr_serio_ids);
    162
    163static struct serio_driver tr_drv = {
    164	.driver		= {
    165		.name	= "touchright",
    166	},
    167	.description	= DRIVER_DESC,
    168	.id_table	= tr_serio_ids,
    169	.interrupt	= tr_interrupt,
    170	.connect	= tr_connect,
    171	.disconnect	= tr_disconnect,
    172};
    173
    174module_serio_driver(tr_drv);