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/*
* Copyright (C) 2010-2011 Richard Hughes <richard@hughsie.com>
* Copyright (C) 2012 Bastien Nocera <hadess@hadess.net>
*
* Licensed under the GNU General Public License Version 2
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib.h>
#include <locale.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <gudev/gudev.h>
#define LED_BRIGHTNESS 127 /* maximum brightness accepted by led on wacom Intuos4 connected over Bluetooth */
static int
gsd_wacom_led_helper_write (const gchar *filename, gint value, GError **error)
{
gchar *text = NULL;
gint retval;
gint length;
gint fd = -1;
int ret = 1;
fd = open (filename, O_WRONLY);
if (fd < 0) {
g_set_error (error, 1, 0, "failed to open filename: %s", filename);
goto out;
}
/* convert to text */
text = g_strdup_printf ("%i", value);
length = strlen (text);
/* write to device file */
retval = write (fd, text, length);
if (retval != length) {
g_set_error (error, 1, 0, "writing '%s' to %s failed", text, filename);
goto out;
} else
ret = 0;
out:
if (fd >= 0)
close (fd);
g_free (text);
return ret;
}
static char *
get_led_sys_path (GUdevClient *client,
GUdevDevice *device,
int group_num,
int led_num,
gboolean usb,
int *write_value)
{
GUdevDevice *parent;
char *status = NULL;
char *filename = NULL;
GUdevDevice *hid_dev;
const char *dev_uniq;
GList *hid_list;
GList *element;
const char *dev_hid_uniq;
/* check for new unified hid implementation first */
parent = g_udev_device_get_parent_with_subsystem (device, "hid", NULL);
if (parent) {
status = g_strdup_printf ("status_led%d_select", group_num);
filename = g_build_filename (g_udev_device_get_sysfs_path (parent), "wacom_led", status, NULL);
g_free (status);
g_object_unref (parent);
if(g_file_test (filename, G_FILE_TEST_EXISTS)) {
*write_value = led_num;
return filename;
}
g_clear_pointer (&filename, g_free);
}
/* old kernel */
if (usb) {
parent = g_udev_device_get_parent_with_subsystem (device, "usb", "usb_interface");
if (!parent)
goto no_parent;
status = g_strdup_printf ("status_led%d_select", group_num);
filename = g_build_filename (g_udev_device_get_sysfs_path (parent), "wacom_led", status, NULL);
g_free (status);
*write_value = led_num;
} else {
parent = g_udev_device_get_parent_with_subsystem (device, "input", NULL);
if (!parent)
goto no_parent;
dev_uniq = g_udev_device_get_property (parent, "UNIQ");
hid_list = g_udev_client_query_by_subsystem (client, "hid");
element = g_list_first(hid_list);
while (element) {
hid_dev = (GUdevDevice*)element->data;
dev_hid_uniq = g_udev_device_get_property (hid_dev, "HID_UNIQ");
if (g_strrstr (dev_uniq, dev_hid_uniq)){
status = g_strdup_printf ("/leds/%s:selector:%i/brightness", g_udev_device_get_name (hid_dev), led_num);
filename = g_build_filename (g_udev_device_get_sysfs_path (hid_dev), status, NULL);
g_free (status);
break;
}
element = g_list_next(element);
}
g_list_free_full(hid_list, g_object_unref);
*write_value = LED_BRIGHTNESS;
}
g_object_unref (parent);
return filename;
no_parent:
g_debug ("Could not find proper parent device for '%s'",
g_udev_device_get_device_file (device));
return NULL;
}
int main (int argc, char **argv)
{
GOptionContext *context;
GUdevClient *client;
GUdevDevice *device;
int uid, euid;
char *filename;
gboolean usb;
int value;
GError *error = NULL;
const char * const subsystems[] = { "hid", "input", NULL };
int ret = 1;
char *path = NULL;
int group_num = -1;
int led_num = -1;
const GOptionEntry options[] = {
{ "path", '\0', 0, G_OPTION_ARG_FILENAME, &path, "Device path for the Wacom device", NULL },
{ "group", '\0', 0, G_OPTION_ARG_INT, &group_num, "Which LED group to set", NULL },
{ "led", '\0', 0, G_OPTION_ARG_INT, &led_num, "Which LED to set", NULL },
{ NULL}
};
/* get calling process */
uid = getuid ();
euid = geteuid ();
if (uid != 0 || euid != 0) {
g_print ("This program can only be used by the root user\n");
return 1;
}
context = g_option_context_new (NULL);
g_option_context_set_summary (context, "GNOME Settings Daemon Wacom LED Helper");
g_option_context_add_main_entries (context, options, NULL);
g_option_context_parse (context, &argc, &argv, NULL);
if (path == NULL ||
group_num < 0 ||
led_num < 0) {
char *txt;
txt = g_option_context_get_help (context, FALSE, NULL);
g_print ("%s", txt);
g_free (txt);
g_option_context_free (context);
return 1;
}
g_option_context_free (context);
client = g_udev_client_new (subsystems);
device = g_udev_client_query_by_device_file (client, path);
if (device == NULL) {
g_debug ("Could not find device '%s' in udev database", path);
goto out;
}
if (g_udev_device_get_property_as_boolean (device, "ID_INPUT_TABLET") == FALSE &&
g_udev_device_get_property_as_boolean (device, "ID_INPUT_TOUCHPAD") == FALSE) {
g_debug ("Device '%s' is not a Wacom tablet", path);
goto out;
}
if (g_strcmp0 (g_udev_device_get_property (device, "ID_BUS"), "usb") != 0)
usb = FALSE;
else
usb = TRUE;
filename = get_led_sys_path (client, device, group_num, led_num, usb, &value);
if (!filename)
goto out;
if (gsd_wacom_led_helper_write (filename, value, &error)) {
g_debug ("Could not set LED status for '%s': %s", path, error->message);
g_error_free (error);
g_free (filename);
goto out;
}
g_free (filename);
g_debug ("Successfully set LED status for '%s', group %d to %d",
path, group_num, led_num);
ret = 0;
out:
g_free (path);
g_clear_object (&device);
g_clear_object (&client);
return ret;
}
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