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linux-hardened/drivers/input/mouse/inport.c
David Howells f6b12d0434 Annotate hardware config module parameters in drivers/input/ 
When the kernel is running in secure boot mode, we lock down the kernel to
prevent userspace from modifying the running kernel image.  Whilst this
includes prohibiting access to things like /dev/mem, it must also prevent
access by means of configuring driver modules in such a way as to cause a
device to access or modify the kernel image.

To this end, annotate module_param* statements that refer to hardware
configuration and indicate for future reference what type of parameter they
specify.  The parameter parser in the core sees this information and can
skip such parameters with an error message if the kernel is locked down.
The module initialisation then runs as normal, but just sees whatever the
default values for those parameters is.

Note that we do still need to do the module initialisation because some
drivers have viable defaults set in case parameters aren't specified and
some drivers support automatic configuration (e.g. PNP or PCI) in addition
to manually coded parameters.

This patch annotates drivers in drivers/input/.

Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
cc: linux-input@vger.kernel.org
2017-04-20 12:02:32 +01:00

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/*
* Copyright (c) 1999-2001 Vojtech Pavlik
*
* Based on the work of:
* Teemu Rantanen Derrick Cole
* Peter Cervasio Christoph Niemann
* Philip Blundell Russell King
* Bob Harris
*/
/*
* Inport (ATI XL and Microsoft) busmouse driver for Linux
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <asm/io.h>
#include <asm/irq.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Inport (ATI XL and Microsoft) busmouse driver");
MODULE_LICENSE("GPL");
#define INPORT_BASE 0x23c
#define INPORT_EXTENT 4
#define INPORT_CONTROL_PORT INPORT_BASE + 0
#define INPORT_DATA_PORT INPORT_BASE + 1
#define INPORT_SIGNATURE_PORT INPORT_BASE + 2
#define INPORT_REG_BTNS 0x00
#define INPORT_REG_X 0x01
#define INPORT_REG_Y 0x02
#define INPORT_REG_MODE 0x07
#define INPORT_RESET 0x80
#ifdef CONFIG_MOUSE_ATIXL
#define INPORT_NAME "ATI XL Mouse"
#define INPORT_VENDOR 0x0002
#define INPORT_SPEED_30HZ 0x01
#define INPORT_SPEED_50HZ 0x02
#define INPORT_SPEED_100HZ 0x03
#define INPORT_SPEED_200HZ 0x04
#define INPORT_MODE_BASE INPORT_SPEED_100HZ
#define INPORT_MODE_IRQ 0x08
#else
#define INPORT_NAME "Microsoft InPort Mouse"
#define INPORT_VENDOR 0x0001
#define INPORT_MODE_BASE 0x10
#define INPORT_MODE_IRQ 0x01
#endif
#define INPORT_MODE_HOLD 0x20
#define INPORT_IRQ 5
static int inport_irq = INPORT_IRQ;
module_param_hw_named(irq, inport_irq, uint, irq, 0);
MODULE_PARM_DESC(irq, "IRQ number (5=default)");
static struct input_dev *inport_dev;
static irqreturn_t inport_interrupt(int irq, void *dev_id)
{
unsigned char buttons;
outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
outb(INPORT_MODE_HOLD | INPORT_MODE_IRQ | INPORT_MODE_BASE, INPORT_DATA_PORT);
outb(INPORT_REG_X, INPORT_CONTROL_PORT);
input_report_rel(inport_dev, REL_X, inb(INPORT_DATA_PORT));
outb(INPORT_REG_Y, INPORT_CONTROL_PORT);
input_report_rel(inport_dev, REL_Y, inb(INPORT_DATA_PORT));
outb(INPORT_REG_BTNS, INPORT_CONTROL_PORT);
buttons = inb(INPORT_DATA_PORT);
input_report_key(inport_dev, BTN_MIDDLE, buttons & 1);
input_report_key(inport_dev, BTN_LEFT, buttons & 2);
input_report_key(inport_dev, BTN_RIGHT, buttons & 4);
outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
outb(INPORT_MODE_IRQ | INPORT_MODE_BASE, INPORT_DATA_PORT);
input_sync(inport_dev);
return IRQ_HANDLED;
}
static int inport_open(struct input_dev *dev)
{
if (request_irq(inport_irq, inport_interrupt, 0, "inport", NULL))
return -EBUSY;
outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
outb(INPORT_MODE_IRQ | INPORT_MODE_BASE, INPORT_DATA_PORT);
return 0;
}
static void inport_close(struct input_dev *dev)
{
outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
outb(INPORT_MODE_BASE, INPORT_DATA_PORT);
free_irq(inport_irq, NULL);
}
static int __init inport_init(void)
{
unsigned char a, b, c;
int err;
if (!request_region(INPORT_BASE, INPORT_EXTENT, "inport")) {
printk(KERN_ERR "inport.c: Can't allocate ports at %#x\n", INPORT_BASE);
return -EBUSY;
}
a = inb(INPORT_SIGNATURE_PORT);
b = inb(INPORT_SIGNATURE_PORT);
c = inb(INPORT_SIGNATURE_PORT);
if (a == b || a != c) {
printk(KERN_INFO "inport.c: Didn't find InPort mouse at %#x\n", INPORT_BASE);
err = -ENODEV;
goto err_release_region;
}
inport_dev = input_allocate_device();
if (!inport_dev) {
printk(KERN_ERR "inport.c: Not enough memory for input device\n");
err = -ENOMEM;
goto err_release_region;
}
inport_dev->name = INPORT_NAME;
inport_dev->phys = "isa023c/input0";
inport_dev->id.bustype = BUS_ISA;
inport_dev->id.vendor = INPORT_VENDOR;
inport_dev->id.product = 0x0001;
inport_dev->id.version = 0x0100;
inport_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
inport_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
inport_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
inport_dev->open = inport_open;
inport_dev->close = inport_close;
outb(INPORT_RESET, INPORT_CONTROL_PORT);
outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
outb(INPORT_MODE_BASE, INPORT_DATA_PORT);
err = input_register_device(inport_dev);
if (err)
goto err_free_dev;
return 0;
err_free_dev:
input_free_device(inport_dev);
err_release_region:
release_region(INPORT_BASE, INPORT_EXTENT);
return err;
}
static void __exit inport_exit(void)
{
input_unregister_device(inport_dev);
release_region(INPORT_BASE, INPORT_EXTENT);
}
module_init(inport_init);
module_exit(inport_exit);
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