153 lines
3.5 KiB
C
153 lines
3.5 KiB
C
/*
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* Remote Processor Framework
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/remoteproc.h>
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#include "remoteproc_internal.h"
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#define to_rproc(d) container_of(d, struct rproc, dev)
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/* Expose the loaded / running firmware name via sysfs */
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static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct rproc *rproc = to_rproc(dev);
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return sprintf(buf, "%s\n", rproc->firmware);
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}
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/* Change firmware name via sysfs */
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static ssize_t firmware_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rproc *rproc = to_rproc(dev);
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char *p;
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int err, len = count;
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err = mutex_lock_interruptible(&rproc->lock);
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if (err) {
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dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, err);
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return -EINVAL;
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}
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if (rproc->state != RPROC_OFFLINE) {
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dev_err(dev, "can't change firmware while running\n");
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err = -EBUSY;
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goto out;
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}
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len = strcspn(buf, "\n");
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p = kstrndup(buf, len, GFP_KERNEL);
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if (!p) {
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err = -ENOMEM;
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goto out;
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}
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kfree(rproc->firmware);
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rproc->firmware = p;
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out:
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mutex_unlock(&rproc->lock);
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return err ? err : count;
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}
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static DEVICE_ATTR_RW(firmware);
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/*
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* A state-to-string lookup table, for exposing a human readable state
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* via sysfs. Always keep in sync with enum rproc_state
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*/
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static const char * const rproc_state_string[] = {
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[RPROC_OFFLINE] = "offline",
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[RPROC_SUSPENDED] = "suspended",
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[RPROC_RUNNING] = "running",
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[RPROC_CRASHED] = "crashed",
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[RPROC_DELETED] = "deleted",
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[RPROC_LAST] = "invalid",
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};
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/* Expose the state of the remote processor via sysfs */
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static ssize_t state_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct rproc *rproc = to_rproc(dev);
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unsigned int state;
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state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state;
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return sprintf(buf, "%s\n", rproc_state_string[state]);
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}
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/* Change remote processor state via sysfs */
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static ssize_t state_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rproc *rproc = to_rproc(dev);
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int ret = 0;
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if (sysfs_streq(buf, "start")) {
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if (rproc->state == RPROC_RUNNING)
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return -EBUSY;
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ret = rproc_boot(rproc);
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if (ret)
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dev_err(&rproc->dev, "Boot failed: %d\n", ret);
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} else if (sysfs_streq(buf, "stop")) {
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if (rproc->state != RPROC_RUNNING)
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return -EINVAL;
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rproc_shutdown(rproc);
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} else {
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dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
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ret = -EINVAL;
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}
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return ret ? ret : count;
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}
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static DEVICE_ATTR_RW(state);
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static struct attribute *rproc_attrs[] = {
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&dev_attr_firmware.attr,
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&dev_attr_state.attr,
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NULL
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};
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static const struct attribute_group rproc_devgroup = {
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.attrs = rproc_attrs
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};
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static const struct attribute_group *rproc_devgroups[] = {
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&rproc_devgroup,
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NULL
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};
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struct class rproc_class = {
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.name = "remoteproc",
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.dev_groups = rproc_devgroups,
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};
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int __init rproc_init_sysfs(void)
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{
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/* create remoteproc device class for sysfs */
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int err = class_register(&rproc_class);
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if (err)
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pr_err("remoteproc: unable to register class\n");
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return err;
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}
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void __exit rproc_exit_sysfs(void)
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{
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class_unregister(&rproc_class);
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}
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