staging: gpib: Add GPIB common core driver

This is the common core driver that interfaces with the userland code
and creates the gpib device files.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20240918121908.19366-6-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gpib/common/Makefile

@@ -0,0 +1,6 @@
+
+obj-m += gpib_common.o
+
+gpib_common-objs := gpib_os.o iblib.o
+
+

drivers/staging/gpib/common/ibsys.h

@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include "gpibP.h"
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/major.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/timer.h>
+
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+
+int gpib_allocate_board(gpib_board_t *board);
+void gpib_deallocate_board(gpib_board_t *board);
+
+unsigned int num_status_bytes(const gpib_status_queue_t *dev);
+int push_status_byte(gpib_status_queue_t *device, uint8_t poll_byte);
+int pop_status_byte(gpib_status_queue_t *device, uint8_t *poll_byte);
+gpib_status_queue_t *get_gpib_status_queue(gpib_board_t *board, unsigned int pad, int sad);
+int get_serial_poll_byte(gpib_board_t *board, unsigned int pad, int sad,
+			 unsigned int usec_timeout, uint8_t *poll_byte);
+int autopoll_all_devices(gpib_board_t *board);