linux-stable/drivers/char/xillybus/xillybus_class.h

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char: xillybus: Move class-related functions to new xillybus_class.c This patch is a preparation for adding another related driver, XillyUSB. In order to share some code between the existing Xillybus driver and the one to be added, some functions are moved to xillybus_class.c XILLYBUS_CLASS is added to Kconfig and is common to all drivers in this group. The relation with the existing XILLYBUS symbol is "select" rather than "depends on" XILLYBUS_CLASS, or else "make olddefconfig" will silently turn off XILLYBUS, which is currently enabled in several distributions. XILLYBUS_CLASS doesn't depend on anything else, hence using it with "select" poses no risk for a broken configuration. After the future addition of the XillyUSB module, the tree of symbols will be as follows: XILLYBUS_CLASS --+-- XILLYBUS --+-- XILLYBUS_PCIE | | | +-- XILLYBUS_OF | +-- XILLYUSB XILLYBUS is for drivers based upon memory registers + DMA-based interfaces, and it's combined with XILLYBUS_PCIE and/or XILLYBUS_OF. XILLYUSB is for the USB variant only. Or a more detailed, bottom-up outline: * CONFIG_XILLYBUS_PCIE -> xillybus_pcie.c: Functions related to PCIe. * CONFIG_XILLYBUS_OF -> xillybus_of.c: Functions related to Xillybus as a peripheral on an FPGA / Processor combo chip. * CONFIG_XILLYBUS -> xillybus_core.c: Functions that are common to the two above, mainly access to the peripheral with memory-mapped registers and DMA. * CONFIG_XILLYUSB -> xillyusb.c: The driver for the USB variant, accesses the peripheral through the USB framework. * CONFIG_XILLYBUS_CLASS -> xillybus_class.c: The new module, which contains the class and API parts that would otherwise appear both in xillybus_core.c and xillyusb.c. Contains utility functions for the two latter. And since I'm at it, comments on the module names are added in the Kconfig's help part. The functions are exported with the non-GPL EXPORT_SYMBOL (a matter of taste). Signed-off-by: Eli Billauer <eli.billauer@gmail.com> Link: https://lore.kernel.org/r/20210526100311.56327-2-eli.billauer@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-26 10:03:10 +00:00
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2021 Xillybus Ltd, http://www.xillybus.com
*
* Header file for the Xillybus class
*/
#ifndef __XILLYBUS_CLASS_H
#define __XILLYBUS_CLASS_H
#include <linux/types.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/module.h>
int xillybus_init_chrdev(struct device *dev,
const struct file_operations *fops,
struct module *owner,
void *private_data,
unsigned char *idt, unsigned int len,
int num_nodes,
const char *prefix, bool enumerate);
void xillybus_cleanup_chrdev(void *private_data,
struct device *dev);
int xillybus_find_inode(struct inode *inode,
void **private_data, int *index);
#endif /* __XILLYBUS_CLASS_H */