summaryrefslogtreecommitdiff
path: root/src/udev/udev-builtin-input_id.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/udev/udev-builtin-input_id.c')
-rw-r--r--src/udev/udev-builtin-input_id.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-input_id.c b/src/udev/udev-builtin-input_id.c
new file mode 100644
index 0000000000..a062ef7c7a
--- /dev/null
+++ b/src/udev/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",
+};
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-05 17:54:15 +0000