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    Subject[PATCH v3 4/8] staging: fsl-mc: root dprc rescan attribute to sync kernel with MC
    Date
    Introduce the rescan attribute as a device attribute to
    synchronize the fsl-mc bus objects and the MC firmware.

    To rescan the root dprc only, e.g.
    echo 1 > /sys/bus/fsl-mc/devices/dprc.1/rescan

    Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
    ---
    v3: rebased on top of greg's staging-testing

    drivers/staging/fsl-mc/bus/mc-bus.c | 44 +++++++++++++++++++++++++++++++++++
    1 file changed, 44 insertions(+)

    diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
    index b828985..b47c3ec 100644
    --- a/drivers/staging/fsl-mc/bus/mc-bus.c
    +++ b/drivers/staging/fsl-mc/bus/mc-bus.c
    @@ -102,10 +102,54 @@ static int fsl_mc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
    return 0;
    }

    +static ssize_t rescan_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + unsigned long val;
    + unsigned int irq_count;
    + struct fsl_mc_device *root_mc_dev;
    + struct fsl_mc_bus *root_mc_bus;
    +
    + if (!is_root_dprc(dev))
    + return -EINVAL;
    +
    + root_mc_dev = to_fsl_mc_device(dev);
    + root_mc_bus = to_fsl_mc_bus(root_mc_dev);
    +
    + if (kstrtoul(buf, 0, &val) < 0)
    + return -EINVAL;
    +
    + if (val) {
    + mutex_lock(&root_mc_bus->scan_mutex);
    + dprc_scan_objects(root_mc_dev, &irq_count);
    + mutex_unlock(&root_mc_bus->scan_mutex);
    + }
    +
    + return count;
    +}
    +
    +static DEVICE_ATTR_WO(rescan);
    +
    +static struct attribute *fsl_mc_dev_attrs[] = {
    + &dev_attr_rescan.attr,
    + NULL,
    +};
    +
    +static const struct attribute_group fsl_mc_dev_group = {
    + .attrs = fsl_mc_dev_attrs,
    +};
    +
    +static const struct attribute_group *fsl_mc_dev_groups[] = {
    + &fsl_mc_dev_group,
    + NULL,
    +};
    +
    struct bus_type fsl_mc_bus_type = {
    .name = "fsl-mc",
    .match = fsl_mc_bus_match,
    .uevent = fsl_mc_bus_uevent,
    + .dev_groups = fsl_mc_dev_groups,
    };
    EXPORT_SYMBOL_GPL(fsl_mc_bus_type);

    --
    1.7.9.5
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