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/*
* Copyright (C) 2010 Broadcom
* Copyright (C) 2015 Noralf Trønnes
* Copyright (C) 2021 Raspberry Pi (Trading) Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/compat.h>
#include <linux/miscdevice.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
#define MODULE_NAME "vcio"
#define VCIO_IOC_MAGIC 100
#define IOCTL_MBOX_PROPERTY _IOWR(VCIO_IOC_MAGIC, 0, char *)
#ifdef CONFIG_COMPAT
#define IOCTL_MBOX_PROPERTY32 _IOWR(VCIO_IOC_MAGIC, 0, compat_uptr_t)
#endif
struct vcio_data {
struct rpi_firmware *fw;
struct miscdevice misc_dev;
};
static int vcio_user_property_list(struct vcio_data *vcio, void *user)
{
u32 *buf, size;
int ret;
/* The first 32-bit is the size of the buffer */
if (copy_from_user(&size, user, sizeof(size)))
return -EFAULT;
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, user, size)) {
kfree(buf);
return -EFAULT;
}
/* Strip off protocol encapsulation */
ret = rpi_firmware_property_list(vcio->fw, &buf[2], size - 12);
if (ret) {
kfree(buf);
return ret;
}
buf[1] = RPI_FIRMWARE_STATUS_SUCCESS;
if (copy_to_user(user, buf, size))
ret = -EFAULT;
kfree(buf);
return ret;
}
static int vcio_device_open(struct inode *inode, struct file *file)
{
try_module_get(THIS_MODULE);
return 0;
}
static int vcio_device_release(struct inode *inode, struct file *file)
{
module_put(THIS_MODULE);
return 0;
}
static long vcio_device_ioctl(struct file *file, unsigned int ioctl_num,
unsigned long ioctl_param)
{
struct vcio_data *vcio = container_of(file->private_data,
struct vcio_data, misc_dev);
switch (ioctl_num) {
case IOCTL_MBOX_PROPERTY:
return vcio_user_property_list(vcio, (void *)ioctl_param);
default:
pr_err("unknown ioctl: %x\n", ioctl_num);
return -EINVAL;
}
}
#ifdef CONFIG_COMPAT
static long vcio_device_compat_ioctl(struct file *file, unsigned int ioctl_num,
unsigned long ioctl_param)
{
struct vcio_data *vcio = container_of(file->private_data,
struct vcio_data, misc_dev);
switch (ioctl_num) {
case IOCTL_MBOX_PROPERTY32:
return vcio_user_property_list(vcio, compat_ptr(ioctl_param));
default:
pr_err("unknown ioctl: %x\n", ioctl_num);
return -EINVAL;
}
}
#endif
const struct file_operations vcio_fops = {
.unlocked_ioctl = vcio_device_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = vcio_device_compat_ioctl,
#endif
.open = vcio_device_open,
.release = vcio_device_release,
};
static int vcio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct device_node *fw_node;
struct rpi_firmware *fw;
struct vcio_data *vcio;
fw_node = of_get_parent(np);
if (!fw_node) {
dev_err(dev, "Missing firmware node\n");
return -ENOENT;
}
fw = rpi_firmware_get(fw_node);
of_node_put(fw_node);
if (!fw)
return -EPROBE_DEFER;
vcio = devm_kzalloc(dev, sizeof(struct vcio_data), GFP_KERNEL);
if (!vcio)
return -ENOMEM;
vcio->fw = fw;
vcio->misc_dev.fops = &vcio_fops;
vcio->misc_dev.minor = MISC_DYNAMIC_MINOR;
vcio->misc_dev.name = "vcio";
vcio->misc_dev.parent = dev;
return misc_register(&vcio->misc_dev);
}
static void vcio_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
misc_deregister(dev_get_drvdata(dev));
}
static const struct of_device_id vcio_ids[] = {
{ .compatible = "raspberrypi,vcio" },
{ }
};
MODULE_DEVICE_TABLE(of, vcio_ids);
static struct platform_driver vcio_driver = {
.driver = {
.name = MODULE_NAME,
.of_match_table = of_match_ptr(vcio_ids),
},
.probe = vcio_probe,
.remove = vcio_remove,
};
module_platform_driver(vcio_driver);
MODULE_AUTHOR("Gray Girling");
MODULE_AUTHOR("Noralf Trønnes");
MODULE_DESCRIPTION("Mailbox userspace access");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rpi-vcio");
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