1 files changed, 218 insertions, 0 deletions
diff --git a/src/udev-builtin-input_id.c b/src/udev-builtin-input_id.c
new file mode 100644
index 0000000000..c0c4270256
--- /dev/null
+++ b/src/udev-builtin-input_id.c
@@ -0,0 +1,218 @@
+/*
+ * compose persistent device path
+ *
+ * Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com>
+ * Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk>
+ * Copyright (C) 2011 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <linux/limits.h>
+#include <linux/input.h>
+
+#include "udev.h"
+
+/* we must use this kernel-compatible implementation */
+#define BITS_PER_LONG (sizeof(unsigned long) * 8)
+#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
+#define OFF(x)  ((x)%BITS_PER_LONG)
+#define BIT(x)  (1UL<<OFF(x))
+#define LONG(x) ((x)/BITS_PER_LONG)
+#define test_bit(bit, array)    ((array[LONG(bit)] >> OFF(bit)) & 1)
+
+/*
+ * Read a capability attribute and return bitmask.
+ * @param dev udev_device
+ * @param attr sysfs attribute name (e. g. "capabilities/key")
+ * @param bitmask: Output array which has a sizeof of bitmask_size
+ */
+static void get_cap_mask(struct udev_device *dev,
+			 struct udev_device *pdev, const char* attr,
+			 unsigned long *bitmask, size_t bitmask_size,
+			 bool test)
+{
+	struct udev *udev = udev_device_get_udev(dev);
+	char text[4096];
+	unsigned i;
+	char* word;
+	unsigned long val;
+
+	snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(pdev, attr));
+	info(udev, "%s raw kernel attribute: %s\n", attr, text);
+
+	memset (bitmask, 0, bitmask_size);
+	i = 0;
+	while ((word = strrchr(text, ' ')) != NULL) {
+		val = strtoul (word+1, NULL, 16);
+		if (i < bitmask_size/sizeof(unsigned long))
+			bitmask[i] = val;
+		else
+			info(udev, "ignoring %s block %lX which is larger than maximum size\n", attr, val);
+		*word = '\0';
+		++i;
+	}
+	val = strtoul (text, NULL, 16);
+	if (i < bitmask_size / sizeof(unsigned long))
+		bitmask[i] = val;
+	else
+		info(udev, "ignoring %s block %lX which is larger than maximum size\n", attr, val);
+
+	if (test) {
+		/* printf pattern with the right unsigned long number of hex chars */
+		snprintf(text, sizeof(text), "  bit %%4u: %%0%zilX\n", 2 * sizeof(unsigned long));
+		info(udev, "%s decoded bit map:\n", attr);
+		val = bitmask_size / sizeof (unsigned long);
+		/* skip over leading zeros */
+		while (bitmask[val-1] == 0 && val > 0)
+			--val;
+		for (i = 0; i < val; ++i)
+			info(udev, text, i * BITS_PER_LONG, bitmask[i]);
+	}
+}
+
+/* pointer devices */
+static void test_pointers (struct udev_device *dev,
+			   const unsigned long* bitmask_ev,
+			   const unsigned long* bitmask_abs,
+			   const unsigned long* bitmask_key,
+			   const unsigned long* bitmask_rel,
+			   bool test)
+{
+	int is_mouse = 0;
+	int is_touchpad = 0;
+
+	if (!test_bit (EV_KEY, bitmask_ev)) {
+		if (test_bit (EV_ABS, bitmask_ev) &&
+		    test_bit (ABS_X, bitmask_abs) &&
+		    test_bit (ABS_Y, bitmask_abs) &&
+		    test_bit (ABS_Z, bitmask_abs))
+			udev_builtin_add_property(dev, test, "ID_INPUT_ACCELEROMETER", "1");
+		return;
+	}
+
+	if (test_bit (EV_ABS, bitmask_ev) &&
+	    test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
+		if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
+			udev_builtin_add_property(dev, test, "ID_INPUT_TABLET", "1");
+		else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
+			is_touchpad = 1;
+		else if (test_bit (BTN_TRIGGER, bitmask_key) ||
+			 test_bit (BTN_A, bitmask_key) ||
+			 test_bit (BTN_1, bitmask_key))
+			udev_builtin_add_property(dev, test, "ID_INPUT_JOYSTICK", "1");
+		else if (test_bit (BTN_MOUSE, bitmask_key))
+			/* This path is taken by VMware's USB mouse, which has
+			 * absolute axes, but no touch/pressure button. */
+			is_mouse = 1;
+		else if (test_bit (BTN_TOUCH, bitmask_key))
+			udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHSCREEN", "1");
+	}
+
+	if (test_bit (EV_REL, bitmask_ev) &&
+	    test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel) &&
+	    test_bit (BTN_MOUSE, bitmask_key))
+		is_mouse = 1;
+
+	if (is_mouse)
+		udev_builtin_add_property(dev, test, "ID_INPUT_MOUSE", "1");
+	if (is_touchpad)
+		udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHPAD", "1");
+}
+
+/* key like devices */
+static void test_key (struct udev_device *dev,
+		      const unsigned long* bitmask_ev,
+		      const unsigned long* bitmask_key,
+		      bool test)
+{
+	struct udev *udev = udev_device_get_udev(dev);
+	unsigned i;
+	unsigned long found;
+	unsigned long mask;
+
+	/* do we have any KEY_* capability? */
+	if (!test_bit (EV_KEY, bitmask_ev)) {
+		info(udev, "test_key: no EV_KEY capability\n");
+		return;
+	}
+
+	/* only consider KEY_* here, not BTN_* */
+	found = 0;
+	for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) {
+		found |= bitmask_key[i];
+		info(udev, "test_key: checking bit block %lu for any keys; found=%i\n", i*BITS_PER_LONG, found > 0);
+	}
+	/* If there are no keys in the lower block, check the higher block */
+	if (!found) {
+		for (i = KEY_OK; i < BTN_TRIGGER_HAPPY; ++i) {
+			if (test_bit (i, bitmask_key)) {
+				info(udev, "test_key: Found key %x in high block\n", i);
+				found = 1;
+				break;
+			}
+		}
+	}
+
+	if (found > 0)
+		udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1");
+
+	/* the first 32 bits are ESC, numbers, and Q to D; if we have all of
+	 * those, consider it a full keyboard; do not test KEY_RESERVED, though */
+	mask = 0xFFFFFFFE;
+	if ((bitmask_key[0] & mask) == mask)
+		udev_builtin_add_property(dev, test, "ID_INPUT_KEYBOARD", "1");
+}
+
+static int builtin_input_id(struct udev_device *dev, int argc, char *argv[], bool test)
+{
+	struct udev_device *pdev;
+	unsigned long bitmask_ev[NBITS(EV_MAX)];
+	unsigned long bitmask_abs[NBITS(ABS_MAX)];
+	unsigned long bitmask_key[NBITS(KEY_MAX)];
+	unsigned long bitmask_rel[NBITS(REL_MAX)];
+
+	/* walk up the parental chain until we find the real input device; the
+	 * argument is very likely a subdevice of this, like eventN */
+	pdev = dev;
+	while (pdev != NULL && udev_device_get_sysattr_value(pdev, "capabilities/ev") == NULL)
+		pdev = udev_device_get_parent_with_subsystem_devtype(pdev, "input", NULL);
+
+	/* not an "input" class device */
+	if (pdev == NULL)
+		return EXIT_SUCCESS;
+
+	/* Use this as a flag that input devices were detected, so that this
+	 * program doesn't need to be called more than once per device */
+	udev_builtin_add_property(dev, test, "ID_INPUT", "1");
+	get_cap_mask(dev, pdev, "capabilities/ev", bitmask_ev, sizeof(bitmask_ev), test);
+	get_cap_mask(dev, pdev, "capabilities/abs", bitmask_abs, sizeof(bitmask_abs), test);
+	get_cap_mask(dev, pdev, "capabilities/rel", bitmask_rel, sizeof(bitmask_rel), test);
+	get_cap_mask(dev, pdev, "capabilities/key", bitmask_key, sizeof(bitmask_key), test);
+	test_pointers(dev, bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel, test);
+	test_key(dev, bitmask_ev, bitmask_key, test);
+	return EXIT_SUCCESS;
+}
+
+const struct udev_builtin udev_builtin_input_id = {
+	.name = "input_id",
+	.cmd = builtin_input_id,
+	.help = "input device properties",
+};