/* * 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@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) #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wformat-nonliteral" /* * 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) { char text[4096]; unsigned i; char* word; unsigned long val; snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(pdev, attr)); log_debug("%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 log_debug("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 log_debug("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)); log_debug("%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) log_debug(text, i * BITS_PER_LONG, bitmask[i]); } } #pragma GCC diagnostic pop /* 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) { unsigned i; unsigned long found; unsigned long mask; /* do we have any KEY_* capability? */ if (!test_bit (EV_KEY, bitmask_ev)) { log_debug("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]; log_debug("test_key: checking bit block %lu for any keys; found=%i\n", (unsigned long)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)) { log_debug("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", };