| /* |
| * 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) |
| |
| /* |
| * 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", attr, text); |
| |
| memzero(bitmask, 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", 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", 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:", 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) { |
| DISABLE_WARNING_FORMAT_NONLITERAL; |
| log_debug(text, i * BITS_PER_LONG, bitmask[i]); |
| REENABLE_WARNING; |
| } |
| } |
| } |
| |
| /* 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_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"); |
| /* joysticks don't necessarily have to have buttons; e. g. |
| * rudders/pedals are joystick-like, but buttonless; they have |
| * other fancy axes */ |
| else if (test_bit (BTN_TRIGGER, bitmask_key) || |
| test_bit (BTN_A, bitmask_key) || |
| test_bit (BTN_1, bitmask_key) || |
| test_bit (ABS_RX, bitmask_abs) || |
| test_bit (ABS_RY, bitmask_abs) || |
| test_bit (ABS_RZ, bitmask_abs) || |
| test_bit (ABS_THROTTLE, bitmask_abs) || |
| test_bit (ABS_RUDDER, bitmask_abs) || |
| test_bit (ABS_WHEEL, bitmask_abs) || |
| test_bit (ABS_GAS, bitmask_abs) || |
| test_bit (ABS_BRAKE, bitmask_abs)) |
| udev_builtin_add_property(dev, test, "ID_INPUT_JOYSTICK", "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"); |
| 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", (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", 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", |
| }; |