summaryrefslogtreecommitdiffstats
path: root/drivers/remoteproc/remoteproc_cdev.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/remoteproc/remoteproc_cdev.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/remoteproc/remoteproc_cdev.c')
-rw-r--r--drivers/remoteproc/remoteproc_cdev.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
new file mode 100644
index 0000000000..687f205fd7
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Character device interface driver for Remoteproc framework.
+ *
+ * Copyright (c) 2020, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/cdev.h>
+#include <linux/compat.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/remoteproc.h>
+#include <linux/uaccess.h>
+#include <uapi/linux/remoteproc_cdev.h>
+
+#include "remoteproc_internal.h"
+
+#define NUM_RPROC_DEVICES 64
+static dev_t rproc_major;
+
+static ssize_t rproc_cdev_write(struct file *filp, const char __user *buf, size_t len, loff_t *pos)
+{
+ struct rproc *rproc = container_of(filp->f_inode->i_cdev, struct rproc, cdev);
+ int ret = 0;
+ char cmd[10];
+
+ if (!len || len > sizeof(cmd))
+ return -EINVAL;
+
+ ret = copy_from_user(cmd, buf, len);
+ if (ret)
+ return -EFAULT;
+
+ if (!strncmp(cmd, "start", len)) {
+ ret = rproc_boot(rproc);
+ } else if (!strncmp(cmd, "stop", len)) {
+ ret = rproc_shutdown(rproc);
+ } else if (!strncmp(cmd, "detach", len)) {
+ ret = rproc_detach(rproc);
+ } else {
+ dev_err(&rproc->dev, "Unrecognized option\n");
+ ret = -EINVAL;
+ }
+
+ return ret ? ret : len;
+}
+
+static long rproc_device_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
+{
+ struct rproc *rproc = container_of(filp->f_inode->i_cdev, struct rproc, cdev);
+ void __user *argp = (void __user *)arg;
+ s32 param;
+
+ switch (ioctl) {
+ case RPROC_SET_SHUTDOWN_ON_RELEASE:
+ if (copy_from_user(&param, argp, sizeof(s32)))
+ return -EFAULT;
+
+ rproc->cdev_put_on_release = !!param;
+ break;
+ case RPROC_GET_SHUTDOWN_ON_RELEASE:
+ param = (s32)rproc->cdev_put_on_release;
+ if (copy_to_user(argp, &param, sizeof(s32)))
+ return -EFAULT;
+
+ break;
+ default:
+ dev_err(&rproc->dev, "Unsupported ioctl\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rproc_cdev_release(struct inode *inode, struct file *filp)
+{
+ struct rproc *rproc = container_of(inode->i_cdev, struct rproc, cdev);
+ int ret = 0;
+
+ if (!rproc->cdev_put_on_release)
+ return 0;
+
+ if (rproc->state == RPROC_RUNNING)
+ rproc_shutdown(rproc);
+ else if (rproc->state == RPROC_ATTACHED)
+ ret = rproc_detach(rproc);
+
+ return ret;
+}
+
+static const struct file_operations rproc_fops = {
+ .write = rproc_cdev_write,
+ .unlocked_ioctl = rproc_device_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .release = rproc_cdev_release,
+};
+
+int rproc_char_device_add(struct rproc *rproc)
+{
+ int ret;
+
+ cdev_init(&rproc->cdev, &rproc_fops);
+ rproc->cdev.owner = THIS_MODULE;
+
+ rproc->dev.devt = MKDEV(MAJOR(rproc_major), rproc->index);
+ cdev_set_parent(&rproc->cdev, &rproc->dev.kobj);
+ ret = cdev_add(&rproc->cdev, rproc->dev.devt, 1);
+ if (ret < 0)
+ dev_err(&rproc->dev, "Failed to add char dev for %s\n", rproc->name);
+
+ return ret;
+}
+
+void rproc_char_device_remove(struct rproc *rproc)
+{
+ cdev_del(&rproc->cdev);
+}
+
+void __init rproc_init_cdev(void)
+{
+ int ret;
+
+ ret = alloc_chrdev_region(&rproc_major, 0, NUM_RPROC_DEVICES, "remoteproc");
+ if (ret < 0)
+ pr_err("Failed to alloc rproc_cdev region, err %d\n", ret);
+}