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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touchkit_ps2.c (2492B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/* ----------------------------------------------------------------------------
      3 * touchkit_ps2.c  --  Driver for eGalax TouchKit PS/2 Touchscreens
      4 *
      5 * Copyright (C) 2005 by Stefan Lucke
      6 * Copyright (C) 2004 by Daniel Ritz
      7 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
      8 *
      9 * Based upon touchkitusb.c
     10 *
     11 * Vendor documentation is available at:
     12 * http://home.eeti.com.tw/web20/drivers/Software%20Programming%20Guide_v2.0.pdf 
     13 */
     14
     15#include <linux/kernel.h>
     16
     17#include <linux/input.h>
     18#include <linux/serio.h>
     19#include <linux/libps2.h>
     20
     21#include "psmouse.h"
     22#include "touchkit_ps2.h"
     23
     24#define TOUCHKIT_MAX_XC			0x07ff
     25#define TOUCHKIT_MAX_YC			0x07ff
     26
     27#define TOUCHKIT_CMD			0x0a
     28#define TOUCHKIT_CMD_LENGTH		1
     29
     30#define TOUCHKIT_CMD_ACTIVE		'A'
     31#define TOUCHKIT_CMD_FIRMWARE_VERSION	'D'
     32#define TOUCHKIT_CMD_CONTROLLER_TYPE	'E'
     33
     34#define TOUCHKIT_SEND_PARMS(s, r, c)	((s) << 12 | (r) << 8 | (c))
     35
     36#define TOUCHKIT_GET_TOUCHED(packet)	(((packet)[0]) & 0x01)
     37#define TOUCHKIT_GET_X(packet)		(((packet)[1] << 7) | (packet)[2])
     38#define TOUCHKIT_GET_Y(packet)		(((packet)[3] << 7) | (packet)[4])
     39
     40static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
     41{
     42	unsigned char *packet = psmouse->packet;
     43	struct input_dev *dev = psmouse->dev;
     44
     45	if (psmouse->pktcnt != 5)
     46		return PSMOUSE_GOOD_DATA;
     47
     48	input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
     49	input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
     50	input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
     51	input_sync(dev);
     52
     53	return PSMOUSE_FULL_PACKET;
     54}
     55
     56int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties)
     57{
     58	struct input_dev *dev = psmouse->dev;
     59	unsigned char param[3];
     60	int command;
     61
     62	param[0] = TOUCHKIT_CMD_LENGTH;
     63	param[1] = TOUCHKIT_CMD_ACTIVE;
     64	command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
     65
     66	if (ps2_command(&psmouse->ps2dev, param, command))
     67		return -ENODEV;
     68
     69	if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
     70	    param[2] != TOUCHKIT_CMD_ACTIVE)
     71		return -ENODEV;
     72
     73	if (set_properties) {
     74		dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
     75		dev->keybit[BIT_WORD(BTN_MOUSE)] = 0;
     76		dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
     77		input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);
     78		input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0);
     79
     80		psmouse->vendor = "eGalax";
     81		psmouse->name = "Touchscreen";
     82		psmouse->protocol_handler = touchkit_ps2_process_byte;
     83		psmouse->pktsize = 5;
     84	}
     85
     86	return 0;
     87}