linux-imx

/*

 * Remote Processor Framework

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#include <linux/remoteproc.h>

​

#include "remoteproc_internal.h"

​

#define to_rproc(d) container_of(d, struct rproc, dev)

​

/* Expose the loaded / running firmware name via sysfs */

static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,

              char *buf)

{

    struct rproc *rproc = to_rproc(dev);

​

    return sprintf(buf, "%s\n", rproc->firmware);

}

​

/* Change firmware name via sysfs */

static ssize_t firmware_store(struct device *dev,

                  struct device_attribute *attr,

                  const char *buf, size_t count)

{

    struct rproc *rproc = to_rproc(dev);

    char *p;

    int err, len = count;

​

    err = mutex_lock_interruptible(&rproc->lock);

    if (err) {

        dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, err);

        return -EINVAL;

    }

​

    if (rproc->state != RPROC_OFFLINE) {

        dev_err(dev, "can't change firmware while running\n");

        err = -EBUSY;

        goto out;

    }

​

    len = strcspn(buf, "\n");

    if (!len) {

        dev_err(dev, "can't provide a NULL firmware\n");

        err = -EINVAL;

        goto out;

    }

​

    p = kstrndup(buf, len, GFP_KERNEL);

    if (!p) {

        err = -ENOMEM;

        goto out;

    }

​

    kfree(rproc->firmware);