diff options
Diffstat (limited to 'src/udev/udev-builtin-input_id.c')
| -rw-r--r-- | src/udev/udev-builtin-input_id.c | 63 |
1 files changed, 49 insertions, 14 deletions
diff --git a/src/udev/udev-builtin-input_id.c b/src/udev/udev-builtin-input_id.c index e6fd077260..26c723225d 100644 --- 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 @@ -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; } |