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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dynapro.c (4455B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Dynapro serial touchscreen driver
      4 *
      5 * Copyright (c) 2009 Tias Guns
      6 * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
      7 * Richard Lemon
      8 */
      9
     10
     11/*
     12 * 2009/09/19 Tias Guns <tias@ulyssis.org>
     13 *   Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
     14 */
     15
     16#include <linux/errno.h>
     17#include <linux/kernel.h>
     18#include <linux/module.h>
     19#include <linux/slab.h>
     20#include <linux/input.h>
     21#include <linux/serio.h>
     22
     23#define DRIVER_DESC	"Dynapro serial touchscreen driver"
     24
     25MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
     26MODULE_DESCRIPTION(DRIVER_DESC);
     27MODULE_LICENSE("GPL");
     28
     29/*
     30 * Definitions & global arrays.
     31 */
     32
     33#define DYNAPRO_FORMAT_TOUCH_BIT 0x40
     34#define DYNAPRO_FORMAT_LENGTH 3
     35#define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
     36
     37#define DYNAPRO_MIN_XC 0
     38#define DYNAPRO_MAX_XC 0x3ff
     39#define DYNAPRO_MIN_YC 0
     40#define DYNAPRO_MAX_YC 0x3ff
     41
     42#define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
     43#define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
     44#define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
     45
     46/*
     47 * Per-touchscreen data.
     48 */
     49
     50struct dynapro {
     51	struct input_dev *dev;
     52	struct serio *serio;
     53	int idx;
     54	unsigned char data[DYNAPRO_FORMAT_LENGTH];
     55	char phys[32];
     56};
     57
     58static void dynapro_process_data(struct dynapro *pdynapro)
     59{
     60	struct input_dev *dev = pdynapro->dev;
     61
     62	if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
     63		input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
     64		input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
     65		input_report_key(dev, BTN_TOUCH,
     66				 DYNAPRO_GET_TOUCHED(pdynapro->data));
     67		input_sync(dev);
     68
     69		pdynapro->idx = 0;
     70	}
     71}
     72
     73static irqreturn_t dynapro_interrupt(struct serio *serio,
     74		unsigned char data, unsigned int flags)
     75{
     76	struct dynapro *pdynapro = serio_get_drvdata(serio);
     77
     78	pdynapro->data[pdynapro->idx] = data;
     79
     80	if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
     81		dynapro_process_data(pdynapro);
     82	else
     83		dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
     84			pdynapro->data[0]);
     85
     86	return IRQ_HANDLED;
     87}
     88
     89static void dynapro_disconnect(struct serio *serio)
     90{
     91	struct dynapro *pdynapro = serio_get_drvdata(serio);
     92
     93	input_get_device(pdynapro->dev);
     94	input_unregister_device(pdynapro->dev);
     95	serio_close(serio);
     96	serio_set_drvdata(serio, NULL);
     97	input_put_device(pdynapro->dev);
     98	kfree(pdynapro);
     99}
    100
    101/*
    102 * dynapro_connect() is the routine that is called when someone adds a
    103 * new serio device that supports dynapro protocol and registers it as
    104 * an input device. This is usually accomplished using inputattach.
    105 */
    106
    107static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
    108{
    109	struct dynapro *pdynapro;
    110	struct input_dev *input_dev;
    111	int err;
    112
    113	pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
    114	input_dev = input_allocate_device();
    115	if (!pdynapro || !input_dev) {
    116		err = -ENOMEM;
    117		goto fail1;
    118	}
    119
    120	pdynapro->serio = serio;
    121	pdynapro->dev = input_dev;
    122	snprintf(pdynapro->phys, sizeof(pdynapro->phys),
    123		 "%s/input0", serio->phys);
    124
    125	input_dev->name = "Dynapro Serial TouchScreen";
    126	input_dev->phys = pdynapro->phys;
    127	input_dev->id.bustype = BUS_RS232;
    128	input_dev->id.vendor = SERIO_DYNAPRO;
    129	input_dev->id.product = 0;
    130	input_dev->id.version = 0x0001;
    131	input_dev->dev.parent = &serio->dev;
    132	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
    133	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
    134	input_set_abs_params(pdynapro->dev, ABS_X,
    135			     DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
    136	input_set_abs_params(pdynapro->dev, ABS_Y,
    137			     DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
    138
    139	serio_set_drvdata(serio, pdynapro);
    140
    141	err = serio_open(serio, drv);
    142	if (err)
    143		goto fail2;
    144
    145	err = input_register_device(pdynapro->dev);
    146	if (err)
    147		goto fail3;
    148
    149	return 0;
    150
    151 fail3:	serio_close(serio);
    152 fail2:	serio_set_drvdata(serio, NULL);
    153 fail1:	input_free_device(input_dev);
    154	kfree(pdynapro);
    155	return err;
    156}
    157
    158/*
    159 * The serio driver structure.
    160 */
    161
    162static const struct serio_device_id dynapro_serio_ids[] = {
    163	{
    164		.type	= SERIO_RS232,
    165		.proto	= SERIO_DYNAPRO,
    166		.id	= SERIO_ANY,
    167		.extra	= SERIO_ANY,
    168	},
    169	{ 0 }
    170};
    171
    172MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
    173
    174static struct serio_driver dynapro_drv = {
    175	.driver		= {
    176		.name	= "dynapro",
    177	},
    178	.description	= DRIVER_DESC,
    179	.id_table	= dynapro_serio_ids,
    180	.interrupt	= dynapro_interrupt,
    181	.connect	= dynapro_connect,
    182	.disconnect	= dynapro_disconnect,
    183};
    184
    185module_serio_driver(dynapro_drv);