Add pckbd driver.

1 files changed, 136 insertions, 0 deletions

diff --git a/src/kernel/dev/pckbd.c b/src/kernel/dev/pckbd.c
new file mode 100644
index 0000000..a911b85
--- /dev/null
+++ b/src/kernel/dev/pckbd.c
@@ -0,0 +1,136 @@
+#include <string.h>
+
+#include <idt.h>
+#include <nullfs.h>
+#include <thread.h>
+
+#include <dev/pckbd.h>
+
+#include <proto/keyboard.h>
+
+#define PCKBD_BUF_LEN 16
+
+kbd_event_t pckbd_buf[PCKBD_BUF_LEN];
+int pckbd_buf_used = 0;
+bool pckbd_escaped = false;
+
+void irq1_handler(registers_t *regs) {
+	uint8_t scancode = inb(0x60);
+	if (scancode == 0xE0) {
+		pckbd_escaped = true;
+	} else {
+		kbd_event_t ev;
+		if (scancode & 0x80) {
+			if (pckbd_escaped) {
+				ev.scancode = scancode;
+				ev.type = KBD_EVENT_KEYRELEASE;
+			} else {
+				ev.scancode = scancode & 0x7F;
+				ev.type = KBD_EVENT_KEYRELEASE;
+			}
+		} else {
+			if (pckbd_escaped) {
+				ev.scancode = scancode | 0x80;
+				ev.type = KBD_EVENT_KEYPRESS;
+			} else {
+				ev.scancode = scancode;
+				ev.type = KBD_EVENT_KEYPRESS;
+			}
+		}
+
+		if (pckbd_buf_used < PCKBD_BUF_LEN) {
+			pckbd_buf[pckbd_buf_used++] = ev;
+
+			resume_on(&pckbd_buf);
+		}
+
+		pckbd_escaped = false;
+	}
+}
+
+//  ---- VFS operations
+
+bool pckbd_open(fs_node_t *n, int mode);
+size_t pckbd_read(fs_handle_t *h, size_t offset, size_t len, char *buf);
+int pckbd_poll(fs_handle_t *h, void** out_wait_obj);
+void pckbd_close(fs_handle_t *h);
+int pckbd_ioctl(fs_handle_t *h, int command, void* data);
+bool pckbd_stat(fs_node_t *n, stat_t *st);
+
+fs_node_ops_t pckbd_ops = {
+	.open = pckbd_open,
+	.read = pckbd_read,
+	.write = 0,
+	.readdir = 0,
+	.poll = pckbd_poll,
+	.close = pckbd_close,
+	.ioctl = pckbd_ioctl,
+	.stat = pckbd_stat,
+	.walk = 0,
+	.delete = 0,
+	.move = 0,
+	.create = 0,
+	.dispose = 0,
+};
+
+void pckbd_setup(fs_t *iofs) {
+	idt_set_irq_handler(IRQ1, &irq1_handler);
+
+	nullfs_add_node(iofs, "/input/pckbd", 0, &pckbd_ops, 0);
+}
+
+bool pckbd_open(fs_node_t *n, int mode) {
+	return (mode == FM_READ);
+}
+
+size_t pckbd_read(fs_handle_t *h, size_t offset, size_t len, char *buf) {
+	int ret = 0;
+
+	int st = enter_critical(CL_NOINT);
+
+	while (len - ret >= sizeof(kbd_event_t) && pckbd_buf_used > 0) {
+		memcpy(buf + ret, &pckbd_buf[0], sizeof(kbd_event_t));
+
+		for (int i = 1; i < pckbd_buf_used; i++) {
+			pckbd_buf[i-1] = pckbd_buf[i];
+		}
+		pckbd_buf_used--;
+
+		ret += sizeof(kbd_event_t);
+	}
+
+	exit_critical(st);
+
+	return ret;
+}
+
+int pckbd_poll(fs_handle_t *h, void** out_wait_obj) {
+	*out_wait_obj = &pckbd_buf;
+
+	return (pckbd_buf_used > 0 ? SEL_READ : 0);
+}
+
+void pckbd_close(fs_handle_t *h) {
+	return;	//  nothing to do
+}
+
+int pckbd_ioctl(fs_handle_t *h, int command, void* data) {
+	if (command == IOCTL_KBD_SET_LEDS) {
+		uint8_t leds = (uint32_t)data & 0x07;
+
+		outb(0x60, leds);
+
+		return 1;
+	}
+	return 0;
+}
+
+bool pckbd_stat(fs_node_t *n, stat_t *st) {
+	st->type = FT_CHARDEV;
+	st->size = 0;
+	st->access = FM_READ;
+
+	return true;
+}
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/