mirror of
https://gitlab.freedesktop.org/libevdev/libevdev.git
synced 2025-12-20 06:50:06 +01:00
tools: add a tool to change kernel devices
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer
parent
def17850d1
commit
3bf7d50230
4 changed files with 321 additions and 1 deletions
1
tools/.gitignore
vendored
1
tools/.gitignore
vendored
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@ -1,3 +1,4 @@
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libevdev-events
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touchpad-edge-detector
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mouse-dpi-tool
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libevdev-tweak-device
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@ -1,7 +1,8 @@
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noinst_PROGRAMS = libevdev-events
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bin_PROGRAMS = \
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touchpad-edge-detector \
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mouse-dpi-tool
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mouse-dpi-tool \
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libevdev-tweak-device
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AM_CPPFLAGS = $(GCC_CFLAGS) -I$(top_srcdir) -I$(top_srcdir)/include -I$(top_srcdir)/libevdev
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libevdev_ldadd = $(top_builddir)/libevdev/libevdev.la
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@ -14,3 +15,7 @@ touchpad_edge_detector_LDADD = $(libevdev_ldadd)
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mouse_dpi_tool_SOURCES = mouse-dpi-tool.c
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mouse_dpi_tool_LDADD = $(libevdev_ldadd)
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libevdev_tweak_device_SOURCES = libevdev-tweak-device.c
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libevdev_tweak_device_LDADD = $(libevdev_ldadd)
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libevdev_tweak_device_MANS = libevdev-tweak-device.1
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59
tools/libevdev-tweak-device.1
Normal file
59
tools/libevdev-tweak-device.1
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@ -0,0 +1,59 @@
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.TH LIBEVDEV-TWEAK-DEVICE "1"
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.SH NAME
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libevdev-tweak-device \- modify an evdev kernel device
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.SH SYNOPSIS
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.B libevdev-tweak-device
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--abs ABS_X [--min a] [--max b] [--res c] [--fuzz d] [--flat e]
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/dev/input/eventX
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.PP
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.B libevdev-tweak-device
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--led LED_NUML --on|--off /dev/input/eventX
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.SH DESCRIPTION
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.PP
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The
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.I libevdev-tweak-device
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tool changes the properties of the evdev kernel device at
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.I /dev/input/eventX.
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Currently this may be used to force an LED on or off, or to change the
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properties of an absolute axis (e.g. its minimum/maximum range or
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resolution). Changes are permanent until the device is removed.
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.SH OPTIONS
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.SS Changing absolute axes
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.TP 8
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.B --abs axis
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Change the given named ABS_ kernel axis, e.g. ABS_X. For a full list, see linux/input.h.
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Each of the options
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.B min, max, res, fuzz, flat
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may be given.
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.TP 8
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.B --min v
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Set the absinfo minimum to the value v
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.TP 8
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.B --max v
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Set the absinfo maximum to the value v
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.TP 8
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.B --res v
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Set the absinfo resolution to the value v
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.TP 8
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.B --fuzz v
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Set the absinfo fuzz to the value v
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.TP 8
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.B --flat v
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Set the absinfo flat to the value v
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.PP
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.SS Toggling LEDs
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.TP 8
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.B --led led
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Change the given LED, e.g. LED_NUML. For a full list, see linux/input.h.
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.TP 8
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.B --on
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Change the LED state to on
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.TP 8
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.B --off
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Change the LED state to off
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.SH NOTES
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.PP
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The kernel does not notify processes about absinfo property changes. Any
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process that has previously obtained the absinfo from the device will remain
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on the old information. This makes using this tool potentially racy, use
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with caution.
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255
tools/libevdev-tweak-device.c
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255
tools/libevdev-tweak-device.c
Normal file
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@ -0,0 +1,255 @@
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/*
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* Copyright © 2014 Red Hat, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#define _GNU_SOURCE
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#include <config.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <linux/input.h>
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#include "libevdev.h"
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static unsigned int changes; /* bitmask of changes */
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static struct input_absinfo absinfo;
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static int axis;
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static int led;
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static int led_state = -1;
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const char *path;
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static void
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usage(void)
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{
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printf("%s --abs <axis> [--min min] [--max max] [--res res] [--fuzz fuzz] [--flat flat] /dev/input/eventXYZ\n"
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"\tChange the absinfo struct for the named axis\n"
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"%s --led <led> --on|--off /dev/input/eventXYZ\n"
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"\tEnable or disable the named LED\n",
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program_invocation_short_name, program_invocation_short_name);
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}
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enum opts {
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OPT_ABS = 1 << 0,
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OPT_MIN = 1 << 1,
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OPT_MAX = 1 << 2,
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OPT_FUZZ = 1 << 3,
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OPT_FLAT = 1 << 4,
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OPT_RES = 1 << 5,
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OPT_LED = 1 << 6,
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OPT_ON = 1 << 7,
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OPT_OFF = 1 << 8,
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OPT_HELP = 1 << 9,
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};
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static int
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parse_options(int argc, char **argv)
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{
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int rc = 1;
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int c;
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int option_index = 0;
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static struct option opts[] = {
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{ "abs", 1, 0, OPT_ABS },
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{ "min", 1, 0, OPT_MIN },
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{ "max", 1, 0, OPT_MAX },
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{ "fuzz", 1, 0, OPT_FUZZ },
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{ "flat", 1, 0, OPT_FLAT },
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{ "res", 1, 0, OPT_RES },
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{ "led", 1, 0, OPT_LED },
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{ "on", 0, 0, OPT_ON },
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{ "off", 0, 0, OPT_OFF },
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{ "help", 0, 0, OPT_HELP },
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{ NULL, 0, 0, 0 },
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};
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if (argc < 2)
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goto error;
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while (1) {
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c = getopt_long(argc, argv, "h", opts, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 'h':
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case OPT_HELP:
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goto error;
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case OPT_ABS:
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if (changes & OPT_LED)
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goto error;
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axis = libevdev_event_code_from_name(EV_ABS,
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optarg);
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if (axis == -1)
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goto error;
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break;
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case OPT_LED:
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if (changes & OPT_ABS)
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goto error;
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led = libevdev_event_code_from_name(EV_LED,
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optarg);
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if (led == -1)
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goto error;
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break;
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case OPT_MIN:
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absinfo.minimum = atoi(optarg);
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break;
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case OPT_MAX:
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absinfo.maximum = atoi(optarg);
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break;
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case OPT_FUZZ:
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absinfo.fuzz = atoi(optarg);
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break;
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case OPT_FLAT:
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absinfo.flat = atoi(optarg);
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break;
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case OPT_RES:
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absinfo.resolution = atoi(optarg);
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break;
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case OPT_ON:
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if (led_state != -1)
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goto error;
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led_state = 1;
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break;
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case OPT_OFF:
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if (led_state != -1)
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goto error;
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led_state = 0;
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break;
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default:
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goto error;
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}
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changes |= c;
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}
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if (optind >= argc)
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goto error;
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path = argv[optind];
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rc = 0;
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error:
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return rc;
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}
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static void
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set_abs(struct libevdev *dev)
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{
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int rc;
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struct input_absinfo abs;
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const struct input_absinfo *a;
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if ((a = libevdev_get_abs_info(dev, axis)) == NULL) {
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fprintf(stderr,
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"Device '%s' doesn't have axis %s\n",
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libevdev_get_name(dev),
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libevdev_event_code_get_name(EV_ABS, axis));
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return;
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}
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abs = *a;
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if (changes & OPT_MIN)
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abs.minimum = absinfo.minimum;
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if (changes & OPT_MAX)
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abs.maximum = absinfo.maximum;
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if (changes & OPT_FUZZ)
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abs.fuzz = absinfo.fuzz;
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if (changes & OPT_FLAT)
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abs.flat = absinfo.flat;
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if (changes & OPT_RES)
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abs.resolution = absinfo.resolution;
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rc = libevdev_kernel_set_abs_info(dev, axis, &abs);
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if (rc != 0)
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fprintf(stderr,
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"Failed to set absinfo %s: %s",
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libevdev_event_code_get_name(EV_ABS, axis),
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strerror(-rc));
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}
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static void
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set_led(struct libevdev *dev)
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{
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int rc;
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enum libevdev_led_value state =
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led_state ? LIBEVDEV_LED_ON : LIBEVDEV_LED_OFF;
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if (!libevdev_has_event_code(dev, EV_LED, led)) {
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fprintf(stderr,
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"Device '%s' doesn't have %s\n",
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libevdev_get_name(dev),
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libevdev_event_code_get_name(EV_LED, axis));
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return;
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}
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rc = libevdev_kernel_set_led_value(dev, led, state);
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if (rc != 0)
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fprintf(stderr,
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"Failed to set LED %s: %s",
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libevdev_event_code_get_name(EV_LED, led),
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strerror(-rc));
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}
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int
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main(int argc, char **argv)
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{
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struct libevdev *dev = NULL;
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int fd;
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int rc = 1;
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rc = parse_options(argc, argv);
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if (rc != 0 || !path) {
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usage();
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goto out;
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}
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fd = open(path, O_RDWR);
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if (fd < 0) {
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perror("Failed to open device");
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goto out;
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}
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rc = libevdev_new_from_fd(fd, &dev);
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if (rc < 0) {
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fprintf(stderr, "Failed to init libevdev (%s)\n", strerror(-rc));
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goto out;
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}
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if (changes & OPT_ABS)
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set_abs(dev);
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else if (changes & OPT_LED)
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set_led(dev);
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else
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fprintf(stderr,
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"++?????++ Out of Cheese Error. Redo From Start.\n");
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out:
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libevdev_free(dev);
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return rc;
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}
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