openwrt/target/linux/bcm27xx/patches-6.6/950-0507-drivers-char-delete-bcm2835-gpiomem.patch

From 862eb3a09138f7aaf0bf1ab25d7e3a7a447fc15b Mon Sep 17 00:00:00 2001
From: Jonathan Bell <jonathan@raspberrypi.com>
Date: Wed, 26 Apr 2023 13:44:15 +0100
Subject: [PATCH 0507/1085] drivers: char: delete bcm2835-gpiomem

This functionality is now provided by raspberrypi-gpiomem.

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
---
 drivers/char/broadcom/Kconfig           |   8 -
 drivers/char/broadcom/Makefile          |   1 -
 drivers/char/broadcom/bcm2835-gpiomem.c | 258 ------------------------
 3 files changed, 267 deletions(-)
 delete mode 100644 drivers/char/broadcom/bcm2835-gpiomem.c

--- a/drivers/char/broadcom/Kconfig
+++ b/drivers/char/broadcom/Kconfig
@@ -23,14 +23,6 @@ config BCM_VCIO
 
 endif
 
-config BCM2835_DEVGPIOMEM
-	tristate "/dev/gpiomem rootless GPIO access via mmap() on the BCM2835"
-	default m
-	help
-		Provides users with root-free access to the GPIO registers
-		on the 2835. Calling mmap(/dev/gpiomem) will map the GPIO
-		register page to the user's pointer.
-
 config BCM2835_SMI_DEV
 	tristate "Character device driver for BCM2835 Secondary Memory Interface"
 	depends on BCM2835_SMI
--- a/drivers/char/broadcom/Makefile
+++ b/drivers/char/broadcom/Makefile
@@ -1,4 +1,3 @@
 obj-$(CONFIG_BCM2708_VCMEM)	+= vc_mem.o
 obj-$(CONFIG_BCM_VCIO)		+= vcio.o
-obj-$(CONFIG_BCM2835_DEVGPIOMEM)+= bcm2835-gpiomem.o
 obj-$(CONFIG_BCM2835_SMI_DEV)	+= bcm2835_smi_dev.o
--- a/drivers/char/broadcom/bcm2835-gpiomem.c
+++ /dev/null
@@ -1,258 +0,0 @@
-/**
- * GPIO memory device driver
- *
- * Creates a chardev /dev/gpiomem which will provide user access to
- * the BCM2835's GPIO registers when it is mmap()'d.
- * No longer need root for user GPIO access, but without relaxing permissions
- * on /dev/mem.
- *
- * Written by Luke Wren <luke@raspberrypi.org>
- * Copyright (c) 2015, Raspberry Pi (Trading) Ltd.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions, and the following disclaimer,
- *    without modification.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The names of the above-listed copyright holders may not be used
- *    to endorse or promote products derived from this software without
- *    specific prior written permission.
- *
- * ALTERNATIVELY, this software may be distributed under the terms of the
- * GNU General Public License ("GPL") version 2, as published by the Free
- * Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/cdev.h>
-#include <linux/pagemap.h>
-#include <linux/io.h>
-
-#define DEVICE_NAME "bcm2835-gpiomem"
-#define DRIVER_NAME "gpiomem-bcm2835"
-#define DEVICE_MINOR 0
-
-struct bcm2835_gpiomem_instance {
-	unsigned long gpio_regs_phys;
-	struct device *dev;
-};
-
-static struct cdev bcm2835_gpiomem_cdev;
-static dev_t bcm2835_gpiomem_devid;
-static struct class *bcm2835_gpiomem_class;
-static struct device *bcm2835_gpiomem_dev;
-static struct bcm2835_gpiomem_instance *inst;
-
-
-/****************************************************************************
-*
-*   GPIO mem chardev file ops
-*
-***************************************************************************/
-
-static int bcm2835_gpiomem_open(struct inode *inode, struct file *file)
-{
-	int dev = iminor(inode);
-	int ret = 0;
-
-	if (dev != DEVICE_MINOR) {
-		dev_err(inst->dev, "Unknown minor device: %d", dev);
-		ret = -ENXIO;
-	}
-	return ret;
-}
-
-static int bcm2835_gpiomem_release(struct inode *inode, struct file *file)
-{
-	int dev = iminor(inode);
-	int ret = 0;
-
-	if (dev != DEVICE_MINOR) {
-		dev_err(inst->dev, "Unknown minor device %d", dev);
-		ret = -ENXIO;
-	}
-	return ret;
-}
-
-static const struct vm_operations_struct bcm2835_gpiomem_vm_ops = {
-#ifdef CONFIG_HAVE_IOREMAP_PROT
-	.access = generic_access_phys
-#endif
-};
-
-static int bcm2835_gpiomem_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	/* Ignore what the user says - they're getting the GPIO regs
-	   whether they like it or not! */
-	unsigned long gpio_page = inst->gpio_regs_phys >> PAGE_SHIFT;
-
-	vma->vm_page_prot = phys_mem_access_prot(file, gpio_page,
-						 PAGE_SIZE,
-						 vma->vm_page_prot);
-	vma->vm_ops = &bcm2835_gpiomem_vm_ops;
-	if (remap_pfn_range(vma, vma->vm_start,
-			gpio_page,
-			PAGE_SIZE,
-			vma->vm_page_prot)) {
-		return -EAGAIN;
-	}
-	return 0;
-}
-
-static const struct file_operations
-bcm2835_gpiomem_fops = {
-	.owner = THIS_MODULE,
-	.open = bcm2835_gpiomem_open,
-	.release = bcm2835_gpiomem_release,
-	.mmap = bcm2835_gpiomem_mmap,
-};
-
-
- /****************************************************************************
-*
-*   Probe and remove functions
-*
-***************************************************************************/
-
-
-static int bcm2835_gpiomem_probe(struct platform_device *pdev)
-{
-	int err;
-	void *ptr_err;
-	struct device *dev = &pdev->dev;
-	struct resource *ioresource;
-
-	/* Allocate buffers and instance data */
-
-	inst = kzalloc(sizeof(struct bcm2835_gpiomem_instance), GFP_KERNEL);
-
-	if (!inst) {
-		err = -ENOMEM;
-		goto failed_inst_alloc;
-	}
-
-	inst->dev = dev;
-
-	ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (ioresource) {
-		inst->gpio_regs_phys = ioresource->start;
-	} else {
-		dev_err(inst->dev, "failed to get IO resource");
-		err = -ENOENT;
-		goto failed_get_resource;
-	}
-
-	/* Create character device entries */
-
-	err = alloc_chrdev_region(&bcm2835_gpiomem_devid,
-				  DEVICE_MINOR, 1, DEVICE_NAME);
-	if (err != 0) {
-		dev_err(inst->dev, "unable to allocate device number");
-		goto failed_alloc_chrdev;
-	}
-	cdev_init(&bcm2835_gpiomem_cdev, &bcm2835_gpiomem_fops);
-	bcm2835_gpiomem_cdev.owner = THIS_MODULE;
-	err = cdev_add(&bcm2835_gpiomem_cdev, bcm2835_gpiomem_devid, 1);
-	if (err != 0) {
-		dev_err(inst->dev, "unable to register device");
-		goto failed_cdev_add;
-	}
-
-	/* Create sysfs entries */
-
-	bcm2835_gpiomem_class = class_create(DEVICE_NAME);
-	ptr_err = bcm2835_gpiomem_class;
-	if (IS_ERR(ptr_err))
-		goto failed_class_create;
-
-	bcm2835_gpiomem_dev = device_create(bcm2835_gpiomem_class, NULL,
-					bcm2835_gpiomem_devid, NULL,
-					"gpiomem");
-	ptr_err = bcm2835_gpiomem_dev;
-	if (IS_ERR(ptr_err))
-		goto failed_device_create;
-
-	dev_info(inst->dev, "Initialised: Registers at 0x%08lx",
-		inst->gpio_regs_phys);
-
-	return 0;
-
-failed_device_create:
-	class_destroy(bcm2835_gpiomem_class);
-failed_class_create:
-	cdev_del(&bcm2835_gpiomem_cdev);
-	err = PTR_ERR(ptr_err);
-failed_cdev_add:
-	unregister_chrdev_region(bcm2835_gpiomem_devid, 1);
-failed_alloc_chrdev:
-failed_get_resource:
-	kfree(inst);
-failed_inst_alloc:
-	dev_err(inst->dev, "could not load bcm2835_gpiomem");
-	return err;
-}
-
-static int bcm2835_gpiomem_remove(struct platform_device *pdev)
-{
-	struct device *dev = inst->dev;
-
-	kfree(inst);
-	device_destroy(bcm2835_gpiomem_class, bcm2835_gpiomem_devid);
-	class_destroy(bcm2835_gpiomem_class);
-	cdev_del(&bcm2835_gpiomem_cdev);
-	unregister_chrdev_region(bcm2835_gpiomem_devid, 1);
-
-	dev_info(dev, "GPIO mem driver removed - OK");
-	return 0;
-}
-
- /****************************************************************************
-*
-*   Register the driver with device tree
-*
-***************************************************************************/
-
-static const struct of_device_id bcm2835_gpiomem_of_match[] = {
-	{.compatible = "brcm,bcm2835-gpiomem",},
-	{ /* sentinel */ },
-};
-
-MODULE_DEVICE_TABLE(of, bcm2835_gpiomem_of_match);
-
-static struct platform_driver bcm2835_gpiomem_driver = {
-	.probe = bcm2835_gpiomem_probe,
-	.remove = bcm2835_gpiomem_remove,
-	.driver = {
-		   .name = DRIVER_NAME,
-		   .owner = THIS_MODULE,
-		   .of_match_table = bcm2835_gpiomem_of_match,
-		   },
-};
-
-module_platform_driver(bcm2835_gpiomem_driver);
-
-MODULE_ALIAS("platform:gpiomem-bcm2835");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("gpiomem driver for accessing GPIO from userspace");
-MODULE_AUTHOR("Luke Wren <luke@raspberrypi.org>");