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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nvec_ps2.c (4242B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * nvec_ps2: mouse driver for a NVIDIA compliant embedded controller
      4 *
      5 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
      6 *
      7 * Authors:  Pierre-Hugues Husson <phhusson@free.fr>
      8 *           Ilya Petrov <ilya.muromec@gmail.com>
      9 *           Marc Dietrich <marvin24@gmx.de>
     10 */
     11
     12#include <linux/module.h>
     13#include <linux/slab.h>
     14#include <linux/serio.h>
     15#include <linux/delay.h>
     16#include <linux/platform_device.h>
     17
     18#include "nvec.h"
     19
     20#define PACKET_SIZE	6
     21
     22#define ENABLE_MOUSE	0xf4
     23#define DISABLE_MOUSE	0xf5
     24#define PSMOUSE_RST	0xff
     25
     26#ifdef NVEC_PS2_DEBUG
     27#define NVEC_PHD(str, buf, len) \
     28	print_hex_dump(KERN_DEBUG, str, DUMP_PREFIX_NONE, \
     29			16, 1, buf, len, false)
     30#else
     31#define NVEC_PHD(str, buf, len) do { } while (0)
     32#endif
     33
     34enum ps2_subcmds {
     35	SEND_COMMAND = 1,
     36	RECEIVE_N,
     37	AUTO_RECEIVE_N,
     38	CANCEL_AUTO_RECEIVE,
     39};
     40
     41struct nvec_ps2 {
     42	struct serio *ser_dev;
     43	struct notifier_block notifier;
     44	struct nvec_chip *nvec;
     45};
     46
     47static struct nvec_ps2 ps2_dev;
     48
     49static int ps2_startstreaming(struct serio *ser_dev)
     50{
     51	unsigned char buf[] = { NVEC_PS2, AUTO_RECEIVE_N, PACKET_SIZE };
     52
     53	return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
     54}
     55
     56static void ps2_stopstreaming(struct serio *ser_dev)
     57{
     58	unsigned char buf[] = { NVEC_PS2, CANCEL_AUTO_RECEIVE };
     59
     60	nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
     61}
     62
     63static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
     64{
     65	unsigned char buf[] = { NVEC_PS2, SEND_COMMAND, ENABLE_MOUSE, 1 };
     66
     67	buf[2] = cmd & 0xff;
     68
     69	dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
     70	return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
     71}
     72
     73static int nvec_ps2_notifier(struct notifier_block *nb,
     74			     unsigned long event_type, void *data)
     75{
     76	int i;
     77	unsigned char *msg = data;
     78
     79	switch (event_type) {
     80	case NVEC_PS2_EVT:
     81		for (i = 0; i < msg[1]; i++)
     82			serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
     83		NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
     84		return NOTIFY_STOP;
     85
     86	case NVEC_PS2:
     87		if (msg[2] == 1) {
     88			for (i = 0; i < (msg[1] - 2); i++)
     89				serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
     90			NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
     91		}
     92
     93		else if (msg[1] != 2) /* !ack */
     94			NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
     95		return NOTIFY_STOP;
     96	}
     97
     98	return NOTIFY_DONE;
     99}
    100
    101static int nvec_mouse_probe(struct platform_device *pdev)
    102{
    103	struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
    104	struct serio *ser_dev;
    105
    106	ser_dev = kzalloc(sizeof(*ser_dev), GFP_KERNEL);
    107	if (!ser_dev)
    108		return -ENOMEM;
    109
    110	ser_dev->id.type = SERIO_8042;
    111	ser_dev->write = ps2_sendcommand;
    112	ser_dev->start = ps2_startstreaming;
    113	ser_dev->stop = ps2_stopstreaming;
    114
    115	strscpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
    116	strscpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
    117
    118	ps2_dev.ser_dev = ser_dev;
    119	ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
    120	ps2_dev.nvec = nvec;
    121	nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
    122
    123	serio_register_port(ser_dev);
    124
    125	return 0;
    126}
    127
    128static int nvec_mouse_remove(struct platform_device *pdev)
    129{
    130	struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
    131
    132	ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
    133	ps2_stopstreaming(ps2_dev.ser_dev);
    134	nvec_unregister_notifier(nvec, &ps2_dev.notifier);
    135	serio_unregister_port(ps2_dev.ser_dev);
    136
    137	return 0;
    138}
    139
    140#ifdef CONFIG_PM_SLEEP
    141static int nvec_mouse_suspend(struct device *dev)
    142{
    143	/* disable mouse */
    144	ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
    145
    146	/* send cancel autoreceive */
    147	ps2_stopstreaming(ps2_dev.ser_dev);
    148
    149	return 0;
    150}
    151
    152static int nvec_mouse_resume(struct device *dev)
    153{
    154	/* start streaming */
    155	ps2_startstreaming(ps2_dev.ser_dev);
    156
    157	/* enable mouse */
    158	ps2_sendcommand(ps2_dev.ser_dev, ENABLE_MOUSE);
    159
    160	return 0;
    161}
    162#endif
    163
    164static SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
    165			 nvec_mouse_resume);
    166
    167static struct platform_driver nvec_mouse_driver = {
    168	.probe  = nvec_mouse_probe,
    169	.remove = nvec_mouse_remove,
    170	.driver = {
    171		.name = "nvec-mouse",
    172		.pm = &nvec_mouse_pm_ops,
    173	},
    174};
    175
    176module_platform_driver(nvec_mouse_driver);
    177
    178MODULE_DESCRIPTION("NVEC mouse driver");
    179MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
    180MODULE_ALIAS("platform:nvec-mouse");
    181MODULE_LICENSE("GPL");