summaryrefslogtreecommitdiff
path: root/udev/libinput-device-group.c
blob: d95e70ee826a85692ba21c76b96aa0559a2578f0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/*
 * Copyright © 2015 Red Hat, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libudev.h>

#include "libinput-util.h"

#if HAVE_LIBWACOM_GET_PAIRED_DEVICE
#include <libwacom/libwacom.h>

static void
wacom_handle_paired(struct udev_device *device,
		    int *vendor_id,
		    int *product_id)
{
	WacomDeviceDatabase *db = NULL;
	WacomDevice *tablet = NULL;
	const WacomMatch *paired;

	db = libwacom_database_new();
	if (!db)
		goto out;

	tablet = libwacom_new_from_usbid(db, *vendor_id, *product_id, NULL);
	if (!tablet)
		goto out;
	paired = libwacom_get_paired_device(tablet);
	if (!paired)
		goto out;

	*vendor_id = libwacom_match_get_vendor_id(paired);
	*product_id = libwacom_match_get_product_id(paired);

out:
	if (tablet)
		libwacom_destroy(tablet);
	if (db)
		libwacom_database_destroy(db);
}
#endif

static int
find_tree_distance(struct udev_device *a, struct udev_device *b)
{
	struct udev_device *ancestor_a = a;
	int dist_a = 0;

	while (ancestor_a != NULL) {
		const char *path_a = udev_device_get_syspath(ancestor_a);
		struct udev_device *ancestor_b = b;
		int dist_b = 0;

		while (ancestor_b != NULL) {
			const char *path_b = udev_device_get_syspath(ancestor_b);

			if (streq(path_a, path_b))
				return dist_a + dist_b;

			dist_b++;
			ancestor_b = udev_device_get_parent(ancestor_b);
		}

		dist_a++;
		ancestor_a = udev_device_get_parent(ancestor_a);
	}
	return -1;
}

static void
wacom_handle_ekr(struct udev_device *device,
		 int *vendor_id,
		 int *product_id)
{
	struct udev *udev;
	struct udev_enumerate *e;
	struct udev_list_entry *entry = NULL;
	int best_dist = -1;

	udev = udev_device_get_udev(device);
	e = udev_enumerate_new(udev);
	udev_enumerate_add_match_subsystem(e, "input");
	udev_enumerate_add_match_sysname(e, "input*");
	udev_enumerate_scan_devices(e);

	udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
		struct udev_device *d;
		const char *path;
		const char *pidstr, *vidstr;
		int pid, vid, dist;

		/* Find and use the closest Wacom device on the system,
		 * relying on wacom_handle_paired() to fix our ID later
		 * if needed.
		 */
		path = udev_list_entry_get_name(entry);
		d = udev_device_new_from_syspath(udev, path);
		if (!d)
			continue;

		vidstr = udev_device_get_property_value(d, "ID_VENDOR_ID");
		pidstr = udev_device_get_property_value(d, "ID_MODEL_ID");

		if (vidstr && pidstr &&
		    safe_atoi_base(vidstr, &vid, 16) &&
		    safe_atoi_base(pidstr, &pid, 16) &&
		    vid == VENDOR_ID_WACOM &&
		    pid != PRODUCT_ID_WACOM_EKR) {
			dist = find_tree_distance(device, d);
			if (dist > 0 && (dist < best_dist || best_dist < 0)) {
				*vendor_id = vid;
				*product_id = pid;
				best_dist = dist;
			}
		}

		udev_device_unref(d);
	}

	udev_enumerate_unref(e);
}

int main(int argc, char **argv)
{
	int rc = 1;
	struct udev *udev = NULL;
	struct udev_device *device = NULL;
	const char *syspath,
	           *phys = NULL;
	const char *product;
	int bustype, vendor_id, product_id, version;
	char group[1024];
	char *str;

	if (argc != 2)
		return 1;

	syspath = argv[1];

	udev = udev_new();
	if (!udev)
		goto out;

	device = udev_device_new_from_syspath(udev, syspath);
	if (!device)
		goto out;

	/* Find the first parent with ATTRS{phys} set. For tablets that
	 * value looks like usb-0000:00:14.0-1/input1. Drop the /input1
	 * bit and use the remainder as device group identifier */
	while (device != NULL) {
		struct udev_device *parent;

		phys = udev_device_get_sysattr_value(device, "phys");
		if (phys)
			break;

		parent = udev_device_get_parent(device);
		udev_device_ref(parent);
		udev_device_unref(device);
		device = parent;
	}

	if (!phys)
		goto out;

	/* udev sets PRODUCT on the same device we find PHYS on, let's rely
	   on that*/
	product = udev_device_get_property_value(device, "PRODUCT");
	if (!product)
		product = "00/00/00/00";

	if (sscanf(product,
		   "%x/%x/%x/%x",
		   &bustype,
		   &vendor_id,
		   &product_id,
		   &version) != 4) {
		snprintf(group, sizeof(group), "%s:%s", product, phys);
	} else {
#if HAVE_LIBWACOM_GET_PAIRED_DEVICE
	    if (vendor_id == VENDOR_ID_WACOM) {
		    if (product_id == PRODUCT_ID_WACOM_EKR)
			    wacom_handle_ekr(device,
					     &vendor_id,
					     &product_id);
		    /* This is called for the EKR as well */
		    wacom_handle_paired(device,
					&vendor_id,
					&product_id);
	    }
#endif
	    snprintf(group,
		     sizeof(group),
		     "%x/%x/%x:%s",
		     bustype,
		     vendor_id,
		     product_id,
		     phys);
	}

	str = strstr(group, "/input");
	if (str)
		*str = '\0';

	/* Cintiq 22HD Touch has
	   usb-0000:00:14.0-6.3.1/input0 for the touch
	   usb-0000:00:14.0-6.3.0/input0 for the pen
	   Check if there's a . after the last -, if so, cut off the string
	   there.
	  */
	str = strrchr(group, '.');
	if (str && str > strrchr(group, '-'))
		*str = '\0';

	printf("%s\n", group);

	rc = 0;
out:
	if (device)
		udev_device_unref(device);
	if (udev)
		udev_unref(udev);

	return rc;
}