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Subject[PATCH 4/5] staging: fsl-mc: bus rescan attribute to sync kernel with MC
Date
Introduce the rescan attribute as a bus attribute to
synchronize the fsl-mc bus objects and the MC firmware.

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

Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
---
drivers/staging/fsl-mc/bus/mc-bus.c | 46 +++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)

diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
index 33a56ad..f1baad7 100644
--- a/drivers/staging/fsl-mc/bus/mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
@@ -144,11 +144,57 @@ static const struct attribute_group *fsl_mc_dev_groups[] = {
NULL,
};

+static int scan_fsl_mc_bus(struct device *dev, void *data)
+{
+ struct fsl_mc_device *root_mc_dev;
+ struct fsl_mc_bus *root_mc_bus;
+
+ if (is_root_dprc(dev)) {
+ root_mc_dev = to_fsl_mc_device(dev);
+ root_mc_bus = to_fsl_mc_bus(root_mc_dev);
+ mutex_lock(&root_mc_bus->scan_mutex);
+ dprc_scan_objects(root_mc_dev);
+ mutex_unlock(&root_mc_bus->scan_mutex);
+ }
+
+ return 0;
+}
+
+static ssize_t bus_rescan_store(struct bus_type *bus,
+ const char *buf, size_t count)
+{
+ unsigned long val;
+
+ if (kstrtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ if (val)
+ bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
+
+ return count;
+}
+static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
+
+static struct attribute *fsl_mc_bus_attrs[] = {
+ &bus_attr_rescan.attr,
+ NULL,
+};
+
+static const struct attribute_group fsl_mc_bus_group = {
+ .attrs = fsl_mc_bus_attrs,
+};
+
+static const struct attribute_group *fsl_mc_bus_groups[] = {
+ &fsl_mc_bus_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,
+ .bus_groups = fsl_mc_bus_groups,
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_type);

--
2.3.3


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