138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Character device interface driver for Remoteproc framework.
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*
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* Copyright (c) 2020, The Linux Foundation. All rights reserved.
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*/
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#include <linux/cdev.h>
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#include <linux/compat.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/remoteproc.h>
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#include <linux/uaccess.h>
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#include <uapi/linux/remoteproc_cdev.h>
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#include "remoteproc_internal.h"
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#define NUM_RPROC_DEVICES 64
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static dev_t rproc_major;
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static ssize_t rproc_cdev_write(struct file *filp, const char __user *buf, size_t len, loff_t *pos)
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{
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struct rproc *rproc = container_of(filp->f_inode->i_cdev, struct rproc, cdev);
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int ret = 0;
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char cmd[10];
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if (!len || len > sizeof(cmd))
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return -EINVAL;
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ret = copy_from_user(cmd, buf, len);
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if (ret)
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return -EFAULT;
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if (!strncmp(cmd, "start", len)) {
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if (rproc->state == RPROC_RUNNING ||
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rproc->state == RPROC_ATTACHED)
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return -EBUSY;
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ret = rproc_boot(rproc);
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} else if (!strncmp(cmd, "stop", len)) {
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if (rproc->state != RPROC_RUNNING &&
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rproc->state != RPROC_ATTACHED)
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return -EINVAL;
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rproc_shutdown(rproc);
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} else if (!strncmp(cmd, "detach", len)) {
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if (rproc->state != RPROC_ATTACHED)
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return -EINVAL;
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ret = rproc_detach(rproc);
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} else {
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dev_err(&rproc->dev, "Unrecognized option\n");
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ret = -EINVAL;
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}
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return ret ? ret : len;
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}
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static long rproc_device_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
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{
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struct rproc *rproc = container_of(filp->f_inode->i_cdev, struct rproc, cdev);
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void __user *argp = (void __user *)arg;
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s32 param;
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switch (ioctl) {
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case RPROC_SET_SHUTDOWN_ON_RELEASE:
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if (copy_from_user(¶m, argp, sizeof(s32)))
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return -EFAULT;
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rproc->cdev_put_on_release = !!param;
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break;
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case RPROC_GET_SHUTDOWN_ON_RELEASE:
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param = (s32)rproc->cdev_put_on_release;
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if (copy_to_user(argp, ¶m, sizeof(s32)))
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return -EFAULT;
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break;
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default:
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dev_err(&rproc->dev, "Unsupported ioctl\n");
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return -EINVAL;
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}
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return 0;
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}
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static int rproc_cdev_release(struct inode *inode, struct file *filp)
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{
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struct rproc *rproc = container_of(inode->i_cdev, struct rproc, cdev);
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int ret = 0;
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if (!rproc->cdev_put_on_release)
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return 0;
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if (rproc->state == RPROC_RUNNING)
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rproc_shutdown(rproc);
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else if (rproc->state == RPROC_ATTACHED)
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ret = rproc_detach(rproc);
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return ret;
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}
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static const struct file_operations rproc_fops = {
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.write = rproc_cdev_write,
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.unlocked_ioctl = rproc_device_ioctl,
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.compat_ioctl = compat_ptr_ioctl,
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.release = rproc_cdev_release,
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};
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int rproc_char_device_add(struct rproc *rproc)
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{
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int ret;
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cdev_init(&rproc->cdev, &rproc_fops);
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rproc->cdev.owner = THIS_MODULE;
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rproc->dev.devt = MKDEV(MAJOR(rproc_major), rproc->index);
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cdev_set_parent(&rproc->cdev, &rproc->dev.kobj);
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ret = cdev_add(&rproc->cdev, rproc->dev.devt, 1);
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if (ret < 0)
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dev_err(&rproc->dev, "Failed to add char dev for %s\n", rproc->name);
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return ret;
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}
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void rproc_char_device_remove(struct rproc *rproc)
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{
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cdev_del(&rproc->cdev);
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}
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void __init rproc_init_cdev(void)
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{
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int ret;
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ret = alloc_chrdev_region(&rproc_major, 0, NUM_RPROC_DEVICES, "remoteproc");
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if (ret < 0)
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pr_err("Failed to alloc rproc_cdev region, err %d\n", ret);
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}
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