generic mouse interface

src/sys/mouse.c

@@ -0,0 +1,84 @@
+#include <kernel/mouse.h>
+#include <kernel/devman.h>
+#include <arch/panic.h>
+#include <poll.h>
+#include <arch/interrupt.h>
+
+#define MOUSE_COUNT 32
+
+static int mouseinuse;
+
+mouse_t mouse[MOUSE_COUNT];
+ringbuffer_t devbuffer;
+
+void mouse_packet(int id, mousepacket_t packet){
+	ringbuffer_write(&devbuffer, &packet, sizeof(mousepacket_t));
+	ringbuffer_write(&mouse[id].buffer, &packet, sizeof(mousepacket_t));
+	event_signal(&mouse[id].event, false);
+}
+
+int mouse_getnew(){
+	
+	int id;
+
+	for(id = 0; id < 32; ++id)
+		if(((mouseinuse >> id) & 1) == 0)
+			break;
+
+	if(id == 32)
+		return -1;
+
+	mouseinuse |= 1 << id;
+	
+	return id;
+	
+}
+
+static int read(int *error, int minor, void* buff, size_t count, size_t offset){
+        count /= sizeof(mousepacket_t);
+        if(count == 0){
+                *error = EINVAL;
+                return -1;
+        }
+
+        arch_interrupt_disable();
+
+        count = ringbuffer_read(&devbuffer, buff, count*sizeof(mousepacket_t));
+
+        arch_interrupt_enable();
+
+        *error = 0;
+        return count;
+
+}
+
+static int poll(int minor, pollfd* fd){
+
+        if((fd->events & POLLIN) && devbuffer.read != devbuffer.write)
+                fd->revents |= POLLIN;
+
+
+        return 0;
+}
+
+
+static devcalls calls = {
+	.read = read,
+	.poll = poll
+};
+
+void mouse_init(){
+	
+	for(uintmax_t i = 0; i < MOUSE_COUNT; ++i){
+		if(ringbuffer_init(&mouse[i].buffer, sizeof(mousepacket_t)*100))
+			_panic("Out of memory!", NULL);
+	}
+
+	if(ringbuffer_init(&devbuffer, sizeof(mousepacket_t)*100))
+		_panic("Out of memory", NULL);
+	
+	if(devman_newdevice("mouse", TYPE_CHARDEV, MAJOR_MOUSE, 0, &calls))
+		_panic("Failed to create mouse device", NULL);
+
+
+}