Fixed input device detection on systems that aren't running the udev daemon
Sam Lantinga
parent
639b39c46c
commit
89127c2d70
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@ -25,18 +25,19 @@
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* udevadm info --query=all -n input/event3 (for a keyboard, mouse, etc)
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* udevadm info --query=property -n input/event2
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*/
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#include "SDL_udev.h"
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#ifdef SDL_USE_LIBUDEV
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#include <linux/input.h>
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#include "SDL.h"
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static char* SDL_UDEV_LIBS[] = { "libudev.so.1", "libudev.so.0" };
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#define _THIS SDL_UDEV_PrivateData *_this
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static _THIS = NULL;
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#include "SDL.h"
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static SDL_bool SDL_UDEV_load_sym(const char *fn, void **addr);
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static int SDL_UDEV_load_syms(void);
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static SDL_bool SDL_UDEV_hotplug_update_available(void);
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@ -64,7 +65,9 @@ SDL_UDEV_load_syms(void)
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SDL_UDEV_SYM(udev_device_get_action);
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SDL_UDEV_SYM(udev_device_get_devnode);
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SDL_UDEV_SYM(udev_device_get_subsystem);
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SDL_UDEV_SYM(udev_device_get_parent_with_subsystem_devtype);
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SDL_UDEV_SYM(udev_device_get_property_value);
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SDL_UDEV_SYM(udev_device_get_sysattr_value);
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SDL_UDEV_SYM(udev_device_new_from_syspath);
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SDL_UDEV_SYM(udev_device_unref);
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SDL_UDEV_SYM(udev_enumerate_add_match_property);
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@ -274,6 +277,109 @@ SDL_UDEV_LoadLibrary(void)
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return retval;
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}
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#define BITS_PER_LONG (sizeof(unsigned long) * 8)
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#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
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#define OFF(x) ((x)%BITS_PER_LONG)
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#define BIT(x) (1UL<<OFF(x))
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#define LONG(x) ((x)/BITS_PER_LONG)
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#define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
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static void get_caps(struct udev_device *dev, struct udev_device *pdev, const char *attr, unsigned long *bitmask, size_t bitmask_len)
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{
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const char *value;
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char text[4096];
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char *word;
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int i;
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unsigned long v;
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SDL_memset(bitmask, 0, bitmask_len*sizeof(*bitmask));
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value = _this->udev_device_get_sysattr_value(pdev, attr);
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if (!value) {
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return;
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}
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SDL_strlcpy(text, value, sizeof(text));
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i = 0;
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while ((word = SDL_strrchr(text, ' ')) != NULL) {
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v = SDL_strtoul(word+1, NULL, 16);
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if (i < bitmask_len) {
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bitmask[i] = v;
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}
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++i;
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*word = '\0';
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}
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v = SDL_strtoul(text, NULL, 16);
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if (i < bitmask_len) {
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bitmask[i] = v;
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}
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}
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static int
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guess_device_class(struct udev_device *dev)
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{
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int devclass = 0;
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struct udev_device *pdev;
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unsigned long bitmask_ev[NBITS(EV_MAX)];
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unsigned long bitmask_abs[NBITS(ABS_MAX)];
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unsigned long bitmask_key[NBITS(KEY_MAX)];
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unsigned long bitmask_rel[NBITS(REL_MAX)];
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unsigned long keyboard_mask;
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/* walk up the parental chain until we find the real input device; the
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* argument is very likely a subdevice of this, like eventN */
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pdev = dev;
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while (pdev && !_this->udev_device_get_sysattr_value(pdev, "capabilities/ev")) {
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pdev = _this->udev_device_get_parent_with_subsystem_devtype(pdev, "input", NULL);
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}
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if (!pdev) {
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return 0;
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}
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get_caps(dev, pdev, "capabilities/ev", bitmask_ev, SDL_arraysize(bitmask_ev));
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get_caps(dev, pdev, "capabilities/abs", bitmask_abs, SDL_arraysize(bitmask_abs));
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get_caps(dev, pdev, "capabilities/rel", bitmask_rel, SDL_arraysize(bitmask_rel));
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get_caps(dev, pdev, "capabilities/key", bitmask_key, SDL_arraysize(bitmask_key));
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if (test_bit(EV_ABS, bitmask_ev) &&
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test_bit(ABS_X, bitmask_abs) && test_bit(ABS_Y, bitmask_abs)) {
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if (test_bit(BTN_STYLUS, bitmask_key) || test_bit(BTN_TOOL_PEN, bitmask_key)) {
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; /* ID_INPUT_TABLET */
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} else if (test_bit(BTN_TOOL_FINGER, bitmask_key) && !test_bit(BTN_TOOL_PEN, bitmask_key)) {
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; /* ID_INPUT_TOUCHPAD */
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} else if (test_bit(BTN_MOUSE, bitmask_key)) {
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devclass |= SDL_UDEV_DEVICE_MOUSE; /* ID_INPUT_MOUSE */
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} else if (test_bit(BTN_TOUCH, bitmask_key)) {
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; /* ID_INPUT_TOUCHSCREEN */
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} else if (test_bit(BTN_TRIGGER, bitmask_key) ||
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test_bit(BTN_A, bitmask_key) ||
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test_bit(BTN_1, bitmask_key) ||
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test_bit(ABS_RX, bitmask_abs) ||
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test_bit(ABS_RY, bitmask_abs) ||
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test_bit(ABS_RZ, bitmask_abs) ||
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test_bit(ABS_THROTTLE, bitmask_abs) ||
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test_bit(ABS_RUDDER, bitmask_abs) ||
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test_bit(ABS_WHEEL, bitmask_abs) ||
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test_bit(ABS_GAS, bitmask_abs) ||
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test_bit(ABS_BRAKE, bitmask_abs)) {
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devclass |= SDL_UDEV_DEVICE_JOYSTICK; /* ID_INPUT_JOYSTICK */
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}
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}
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if (test_bit(EV_REL, bitmask_ev) &&
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test_bit(REL_X, bitmask_rel) && test_bit(REL_Y, bitmask_rel) &&
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test_bit(BTN_MOUSE, bitmask_key)) {
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devclass |= SDL_UDEV_DEVICE_MOUSE; /* ID_INPUT_MOUSE */
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}
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/* the first 32 bits are ESC, numbers, and Q to D; if we have all of
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* those, consider it a full keyboard; do not test KEY_RESERVED, though */
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keyboard_mask = 0xFFFFFFFE;
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if ((bitmask_key[0] & keyboard_mask) == keyboard_mask)
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devclass |= SDL_UDEV_DEVICE_KEYBOARD; /* ID_INPUT_KEYBOARD */
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return devclass;
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}
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static void
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device_event(SDL_UDEV_deviceevent type, struct udev_device *dev)
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{
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@ -308,7 +414,7 @@ device_event(SDL_UDEV_deviceevent type, struct udev_device *dev)
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}
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if (devclass == 0) {
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// Fall back to old style input classes
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/* Fall back to old style input classes */
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val = _this->udev_device_get_property_value(dev, "ID_CLASS");
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if (val != NULL) {
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if (SDL_strcmp(val, "joystick") == 0) {
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@ -321,7 +427,8 @@ device_event(SDL_UDEV_deviceevent type, struct udev_device *dev)
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return;
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}
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} else {
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return;
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/* We could be linked with libudev on a system that doesn't have udev running */
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devclass = guess_device_class(dev);
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}
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}
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} else {
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@ -75,7 +75,9 @@ typedef struct SDL_UDEV_PrivateData
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const char *(*udev_device_get_action)(struct udev_device *);
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const char *(*udev_device_get_devnode)(struct udev_device *);
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const char *(*udev_device_get_subsystem)(struct udev_device *);
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struct udev_device *(*udev_device_get_parent_with_subsystem_devtype)(struct udev_device *udev_device, const char *subsystem, const char *devtype);
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const char *(*udev_device_get_property_value)(struct udev_device *, const char *);
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const char *(*udev_device_get_sysattr_value)(struct udev_device *udev_device, const char *sysattr);
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struct udev_device *(*udev_device_new_from_syspath)(struct udev *, const char *);
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void (*udev_device_unref)(struct udev_device *);
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int (*udev_enumerate_add_match_property)(struct udev_enumerate *, const char *, const char *);
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