build-sys: add one more Makefile symlink

[elogind.git] / src / udev / udev-builtin-input_id.c

diff --git a/src/udev/udev-builtin-input_id.c b/src/udev/udev-builtin-input_id.c
index e6fd077260093d794bf426c50479de4b8614d250..46f1c539d2890f6f7eb6290b03cce8f9cfd4e54b 100644 (file)
--- a/src/udev/udev-builtin-input_id.c
+++ b/src/udev/udev-builtin-input_id.c
@@ -1,9 +1,10 @@
 /*
- * compose persistent device path
+ * expose input properties via udev
  *
  * Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com>
  * Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk>
  * Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
+ * Copyright (C) 2014 Carlos Garnacho <carlosg@gnome.org>
  * Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com>
  *
  * This program is free software: you can redistribute it and/or modify
@@ -30,6 +31,7 @@
 #include <linux/input.h>
 
 #include "udev.h"
+#include "util.h"
 
 /* we must use this kernel-compatible implementation */
 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
@@ -39,6 +41,34 @@
 #define LONG(x) ((x)/BITS_PER_LONG)
 #define test_bit(bit, array)    ((array[LONG(bit)] >> OFF(bit)) & 1)
 
+static inline int abs_size_mm(const struct input_absinfo *absinfo) {
+        /* Resolution is defined to be in units/mm for ABS_X/Y */
+        return (absinfo->maximum - absinfo->minimum) / absinfo->resolution;
+}
+
+static void extract_info(struct udev_device *dev, const char *devpath, bool test) {
+        char width[DECIMAL_STR_MAX(int)], height[DECIMAL_STR_MAX(int)];
+        struct input_absinfo xabsinfo = {}, yabsinfo = {};
+        _cleanup_close_ int fd = -1;
+
+        fd = open(devpath, O_RDONLY|O_CLOEXEC);
+        if (fd < 0)
+                return;
+
+        if (ioctl(fd, EVIOCGABS(ABS_X), &xabsinfo) < 0 ||
+            ioctl(fd, EVIOCGABS(ABS_Y), &yabsinfo) < 0)
+                return;
+
+        if (xabsinfo.resolution <= 0 || yabsinfo.resolution <= 0)
+                return;
+
+        snprintf(width, sizeof(width), "%d", abs_size_mm(&xabsinfo));
+        snprintf(height, sizeof(height), "%d", abs_size_mm(&yabsinfo));
+
+        udev_builtin_add_property(dev, test, "ID_INPUT_WIDTH_MM", width);
+        udev_builtin_add_property(dev, test, "ID_INPUT_HEIGHT_MM", height);
+}
+
 /*
  * Read a capability attribute and return bitmask.
  * @param dev udev_device
@@ -81,7 +111,7 @@ static void get_cap_mask(struct udev_device *dev,
 
         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));
+                snprintf(text, sizeof(text), "  bit %%4u: %%0%zulX\n", 2 * sizeof(unsigned long));
                 log_debug("%s decoded bit map:", attr);
                 val = bitmask_size / sizeof (unsigned long);
                 /* skip over leading zeros */
@@ -202,6 +232,7 @@ static int builtin_input_id(struct udev_device *dev, int argc, char *argv[], boo
         unsigned long bitmask_abs[NBITS(ABS_MAX)];
         unsigned long bitmask_key[NBITS(KEY_MAX)];
         unsigned long bitmask_rel[NBITS(REL_MAX)];
+        const char *sysname, *devnode;
 
         /* walk up the parental chain until we find the real input device; the
          * argument is very likely a subdevice of this, like eventN */
@@ -209,19 +240,23 @@ static int builtin_input_id(struct udev_device *dev, int argc, char *argv[], boo
         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);
+        if (pdev) {
+                /* 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);
+        }
+
+        devnode = udev_device_get_devnode(dev);
+        sysname = udev_device_get_sysname(dev);
+        if (devnode && sysname && startswith(sysname, "event"))
+                extract_info(dev, devnode, test);
+
         return EXIT_SUCCESS;
 }