dev: implement writing/reading input events to/from input devices

dev/input.c

@@ -1,4 +1,5 @@
 #include <socks/device.h>
+#include <socks/input.h>
 
 struct input_device *input_device_create(void)
 {
@@ -8,5 +9,43 @@ struct input_device *input_device_create(void)
 	}
 
 	dev->dev_type = DEV_TYPE_INPUT;
+
+	struct input_device *input_dev = INPUT_DEVICE(dev);
+	if (ringbuffer_init(&input_dev->i_events, INPUT_DEVICE_EVENT_QUEUE_SIZE * sizeof(struct input_event)) != KERN_OK) {
+		/* TODO destroy device */
+		return NULL;
+	}
+
 	return INPUT_DEVICE(dev);
 }
+
+kern_status_t input_device_report_event(struct input_device *dev, const struct input_event *ev, bool noblock)
+{
+	struct ringbuffer *event_queue = &dev->i_events;
+	enum ringbuffer_flags flags = RB_NORMAL;
+	if (noblock) {
+		flags = RB_NOBLOCK;
+	}
+
+	size_t r = ringbuffer_write(event_queue, sizeof *ev, ev, flags);
+
+	return r == sizeof *ev ? KERN_OK : KERN_WOULD_BLOCK;
+}
+
+kern_status_t input_device_read(struct device *dev, void *buf, size_t size, size_t *bytes_read)
+{
+	if (dev->dev_type != DEV_TYPE_INPUT || (size % sizeof (struct input_event)) != 0) {
+		return KERN_INVALID_ARGUMENT;
+	}
+
+	struct input_device *input_dev = INPUT_DEVICE(dev);
+	struct ringbuffer *event_queue = &input_dev->i_events;
+
+	size_t r = ringbuffer_read(event_queue, size, buf, RB_NORMAL);
+
+	if (bytes_read) {
+		*bytes_read = r;
+	}
+
+	return KERN_OK;
+}