1 files changed, 87 insertions, 0 deletions

diff --git a/src/capabilities.c b/src/capabilities.c
new file mode 100644
index 0000000..3149131
--- /dev/null
+++ b/src/capabilities.c
@@ -0,0 +1,87 @@
+#include "capabilities.h"
+#include <errno.h>
+
+////////////////////////////////////////////////////////
+
+#define SETABS(c, x, map, key, fd)                                      \
+        c->has_##x = getbit(map, key) && getabs(&c->abs_##x, key, fd)
+
+#define ADDCAP(s, c, x) strcat(s, c->has_##x ? " " #x : "")
+
+////////////////////////////////////////////////////////
+
+static const int bits_per_long = 8 * sizeof(long);
+
+static inline int nlongs(int nbit)
+{
+        return (nbit + bits_per_long - 1) / bits_per_long;
+}
+
+static inline bool getbit(const unsigned long* map, int key)
+{
+        return (map[key / bits_per_long] >> (key % bits_per_long)) & 0x01;
+}
+
+static bool getabs(struct input_absinfo *abs, int key, int fd)
+{
+        int rc;
+        SYSCALL(rc = ioctl(fd, EVIOCGABS(key), abs));
+        return rc >= 0;
+}
+
+////////////////////////////////////////////////////////
+
+static int read_capabilities(struct Capabilities *cap, int fd)
+{
+        unsigned long evbits[nlongs(EV_MAX)];
+        unsigned long absbits[nlongs(ABS_MAX)];
+        unsigned long keybits[nlongs(KEY_MAX)];
+        int rc;
+
+        memset(cap, 0, sizeof(struct Capabilities));
+        
+        SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_SYN, sizeof(evbits)), evbits));
+        if (rc < 0)
+                return rc;
+        SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits));
+        if (rc < 0)
+                return rc;
+        SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbits)), absbits));
+        if (rc < 0)
+                return rc;
+
+        cap->has_left = getbit(keybits, BTN_LEFT);
+        cap->has_middle = getbit(keybits, BTN_MIDDLE);
+        cap->has_right = getbit(keybits, BTN_RIGHT);
+        cap->has_mtdata = getbit(keybits, BTN_MT_REPORT_PACKET);
+
+        SETABS(cap, touch_major, absbits, ABS_MT_TOUCH_MAJOR, fd);
+        SETABS(cap, touch_minor, absbits, ABS_MT_TOUCH_MINOR, fd);
+        SETABS(cap, width_major, absbits, ABS_MT_WIDTH_MAJOR, fd);
+        SETABS(cap, width_minor, absbits, ABS_MT_WIDTH_MINOR, fd);
+        SETABS(cap, orientation, absbits, ABS_MT_ORIENTATION, fd);
+        SETABS(cap, position_x, absbits, ABS_MT_POSITION_X, fd);
+        SETABS(cap, position_y, absbits, ABS_MT_POSITION_Y, fd);
+}
+
+////////////////////////////////////////////////////////
+
+static int output_capabilities(const struct Capabilities *cap)
+{
+        char line[1024];
+        memset(line, 0, sizeof(line));
+        ADDCAP(line, cap, left);
+        ADDCAP(line, cap, middle);
+        ADDCAP(line, cap, right);
+        ADDCAP(line, cap, mtdata);
+        ADDCAP(line, cap, touch_major);
+        ADDCAP(line, cap, touch_minor);
+        ADDCAP(line, cap, width_major);
+        ADDCAP(line, cap, width_minor);
+        ADDCAP(line, cap, orientation);
+        ADDCAP(line, cap, position_x);
+        ADDCAP(line, cap, position_y);
+        xf86Msg(X_INFO, "multitouch: caps:%s\n", line);
+}
+
+////////////////////////////////////////////////////////