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301 lines
9.0 KiB
Diff
301 lines
9.0 KiB
Diff
From 862eb3a09138f7aaf0bf1ab25d7e3a7a447fc15b Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Wed, 26 Apr 2023 13:44:15 +0100
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Subject: [PATCH 0507/1085] drivers: char: delete bcm2835-gpiomem
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This functionality is now provided by raspberrypi-gpiomem.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/char/broadcom/Kconfig | 8 -
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drivers/char/broadcom/Makefile | 1 -
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drivers/char/broadcom/bcm2835-gpiomem.c | 258 ------------------------
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3 files changed, 267 deletions(-)
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delete mode 100644 drivers/char/broadcom/bcm2835-gpiomem.c
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--- a/drivers/char/broadcom/Kconfig
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+++ b/drivers/char/broadcom/Kconfig
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@@ -23,14 +23,6 @@ config BCM_VCIO
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endif
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-config BCM2835_DEVGPIOMEM
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- tristate "/dev/gpiomem rootless GPIO access via mmap() on the BCM2835"
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- default m
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- help
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- Provides users with root-free access to the GPIO registers
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- on the 2835. Calling mmap(/dev/gpiomem) will map the GPIO
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- register page to the user's pointer.
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-
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config BCM2835_SMI_DEV
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tristate "Character device driver for BCM2835 Secondary Memory Interface"
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depends on BCM2835_SMI
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--- a/drivers/char/broadcom/Makefile
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+++ b/drivers/char/broadcom/Makefile
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@@ -1,4 +1,3 @@
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obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o
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obj-$(CONFIG_BCM_VCIO) += vcio.o
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-obj-$(CONFIG_BCM2835_DEVGPIOMEM)+= bcm2835-gpiomem.o
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obj-$(CONFIG_BCM2835_SMI_DEV) += bcm2835_smi_dev.o
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--- a/drivers/char/broadcom/bcm2835-gpiomem.c
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+++ /dev/null
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@@ -1,258 +0,0 @@
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-/**
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- * GPIO memory device driver
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- *
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- * Creates a chardev /dev/gpiomem which will provide user access to
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- * the BCM2835's GPIO registers when it is mmap()'d.
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- * No longer need root for user GPIO access, but without relaxing permissions
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- * on /dev/mem.
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- *
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- * Written by Luke Wren <luke@raspberrypi.org>
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- * Copyright (c) 2015, Raspberry Pi (Trading) Ltd.
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- *
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- * Redistribution and use in source and binary forms, with or without
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- * modification, are permitted provided that the following conditions
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- * are met:
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- * 1. Redistributions of source code must retain the above copyright
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- * notice, this list of conditions, and the following disclaimer,
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- * without modification.
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- * 2. Redistributions in binary form must reproduce the above copyright
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- * notice, this list of conditions and the following disclaimer in the
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- * documentation and/or other materials provided with the distribution.
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- * 3. The names of the above-listed copyright holders may not be used
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- * to endorse or promote products derived from this software without
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- * specific prior written permission.
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- *
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- * ALTERNATIVELY, this software may be distributed under the terms of the
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- * GNU General Public License ("GPL") version 2, as published by the Free
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- * Software Foundation.
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- *
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- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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- */
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-
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-#include <linux/kernel.h>
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-#include <linux/module.h>
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-#include <linux/of.h>
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-#include <linux/platform_device.h>
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-#include <linux/mm.h>
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-#include <linux/slab.h>
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-#include <linux/cdev.h>
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-#include <linux/pagemap.h>
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-#include <linux/io.h>
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-
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-#define DEVICE_NAME "bcm2835-gpiomem"
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-#define DRIVER_NAME "gpiomem-bcm2835"
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-#define DEVICE_MINOR 0
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-
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-struct bcm2835_gpiomem_instance {
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- unsigned long gpio_regs_phys;
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- struct device *dev;
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-};
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-
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-static struct cdev bcm2835_gpiomem_cdev;
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-static dev_t bcm2835_gpiomem_devid;
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-static struct class *bcm2835_gpiomem_class;
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-static struct device *bcm2835_gpiomem_dev;
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-static struct bcm2835_gpiomem_instance *inst;
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-
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-
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-/****************************************************************************
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-*
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-* GPIO mem chardev file ops
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-*
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-***************************************************************************/
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-
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-static int bcm2835_gpiomem_open(struct inode *inode, struct file *file)
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-{
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- int dev = iminor(inode);
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- int ret = 0;
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-
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- if (dev != DEVICE_MINOR) {
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- dev_err(inst->dev, "Unknown minor device: %d", dev);
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- ret = -ENXIO;
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- }
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- return ret;
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-}
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-
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-static int bcm2835_gpiomem_release(struct inode *inode, struct file *file)
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-{
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- int dev = iminor(inode);
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- int ret = 0;
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-
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- if (dev != DEVICE_MINOR) {
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- dev_err(inst->dev, "Unknown minor device %d", dev);
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- ret = -ENXIO;
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- }
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- return ret;
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-}
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-
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-static const struct vm_operations_struct bcm2835_gpiomem_vm_ops = {
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-#ifdef CONFIG_HAVE_IOREMAP_PROT
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- .access = generic_access_phys
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-#endif
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-};
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-
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-static int bcm2835_gpiomem_mmap(struct file *file, struct vm_area_struct *vma)
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-{
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- /* Ignore what the user says - they're getting the GPIO regs
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- whether they like it or not! */
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- unsigned long gpio_page = inst->gpio_regs_phys >> PAGE_SHIFT;
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-
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- vma->vm_page_prot = phys_mem_access_prot(file, gpio_page,
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- PAGE_SIZE,
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- vma->vm_page_prot);
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- vma->vm_ops = &bcm2835_gpiomem_vm_ops;
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- if (remap_pfn_range(vma, vma->vm_start,
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- gpio_page,
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- PAGE_SIZE,
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- vma->vm_page_prot)) {
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- return -EAGAIN;
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- }
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- return 0;
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-}
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-
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-static const struct file_operations
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-bcm2835_gpiomem_fops = {
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- .owner = THIS_MODULE,
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- .open = bcm2835_gpiomem_open,
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- .release = bcm2835_gpiomem_release,
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- .mmap = bcm2835_gpiomem_mmap,
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-};
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-
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-
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- /****************************************************************************
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-*
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-* Probe and remove functions
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-*
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-***************************************************************************/
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-
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-
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-static int bcm2835_gpiomem_probe(struct platform_device *pdev)
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-{
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- int err;
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- void *ptr_err;
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- struct device *dev = &pdev->dev;
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- struct resource *ioresource;
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-
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- /* Allocate buffers and instance data */
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-
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- inst = kzalloc(sizeof(struct bcm2835_gpiomem_instance), GFP_KERNEL);
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-
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- if (!inst) {
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- err = -ENOMEM;
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- goto failed_inst_alloc;
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- }
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-
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- inst->dev = dev;
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-
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- ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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- if (ioresource) {
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- inst->gpio_regs_phys = ioresource->start;
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- } else {
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- dev_err(inst->dev, "failed to get IO resource");
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- err = -ENOENT;
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- goto failed_get_resource;
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- }
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-
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- /* Create character device entries */
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-
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- err = alloc_chrdev_region(&bcm2835_gpiomem_devid,
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- DEVICE_MINOR, 1, DEVICE_NAME);
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- if (err != 0) {
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- dev_err(inst->dev, "unable to allocate device number");
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- goto failed_alloc_chrdev;
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- }
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- cdev_init(&bcm2835_gpiomem_cdev, &bcm2835_gpiomem_fops);
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- bcm2835_gpiomem_cdev.owner = THIS_MODULE;
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- err = cdev_add(&bcm2835_gpiomem_cdev, bcm2835_gpiomem_devid, 1);
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- if (err != 0) {
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- dev_err(inst->dev, "unable to register device");
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- goto failed_cdev_add;
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- }
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-
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- /* Create sysfs entries */
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-
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- bcm2835_gpiomem_class = class_create(DEVICE_NAME);
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- ptr_err = bcm2835_gpiomem_class;
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- if (IS_ERR(ptr_err))
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- goto failed_class_create;
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-
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- bcm2835_gpiomem_dev = device_create(bcm2835_gpiomem_class, NULL,
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- bcm2835_gpiomem_devid, NULL,
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- "gpiomem");
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- ptr_err = bcm2835_gpiomem_dev;
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- if (IS_ERR(ptr_err))
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- goto failed_device_create;
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-
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- dev_info(inst->dev, "Initialised: Registers at 0x%08lx",
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- inst->gpio_regs_phys);
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-
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- return 0;
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-
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-failed_device_create:
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- class_destroy(bcm2835_gpiomem_class);
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-failed_class_create:
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- cdev_del(&bcm2835_gpiomem_cdev);
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- err = PTR_ERR(ptr_err);
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-failed_cdev_add:
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- unregister_chrdev_region(bcm2835_gpiomem_devid, 1);
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-failed_alloc_chrdev:
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-failed_get_resource:
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- kfree(inst);
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-failed_inst_alloc:
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- dev_err(inst->dev, "could not load bcm2835_gpiomem");
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- return err;
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-}
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-
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-static int bcm2835_gpiomem_remove(struct platform_device *pdev)
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-{
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- struct device *dev = inst->dev;
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-
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- kfree(inst);
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- device_destroy(bcm2835_gpiomem_class, bcm2835_gpiomem_devid);
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- class_destroy(bcm2835_gpiomem_class);
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- cdev_del(&bcm2835_gpiomem_cdev);
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- unregister_chrdev_region(bcm2835_gpiomem_devid, 1);
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-
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- dev_info(dev, "GPIO mem driver removed - OK");
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- return 0;
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-}
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-
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- /****************************************************************************
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-*
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-* Register the driver with device tree
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-*
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-***************************************************************************/
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-
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-static const struct of_device_id bcm2835_gpiomem_of_match[] = {
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- {.compatible = "brcm,bcm2835-gpiomem",},
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- { /* sentinel */ },
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-};
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-
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-MODULE_DEVICE_TABLE(of, bcm2835_gpiomem_of_match);
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-
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-static struct platform_driver bcm2835_gpiomem_driver = {
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- .probe = bcm2835_gpiomem_probe,
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- .remove = bcm2835_gpiomem_remove,
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- .driver = {
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- .name = DRIVER_NAME,
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- .owner = THIS_MODULE,
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- .of_match_table = bcm2835_gpiomem_of_match,
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- },
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-};
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-
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-module_platform_driver(bcm2835_gpiomem_driver);
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-
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-MODULE_ALIAS("platform:gpiomem-bcm2835");
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-MODULE_LICENSE("GPL");
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-MODULE_DESCRIPTION("gpiomem driver for accessing GPIO from userspace");
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-MODULE_AUTHOR("Luke Wren <luke@raspberrypi.org>");
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