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79 lines
2.0 KiB
Diff
79 lines
2.0 KiB
Diff
From 417d71b1e291725c01893bf1553478924d05952f Mon Sep 17 00:00:00 2001
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From: Lijun Pan <Lijun.Pan@freescale.com>
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Date: Mon, 8 Feb 2016 17:40:16 -0600
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Subject: [PATCH 191/226] staging: fsl-mc: bus rescan attribute to sync kernel
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with MC
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Introduce the rescan attribute as a bus attribute to
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synchronize the fsl-mc bus objects and the MC firmware.
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To rescan the fsl-mc bus, e.g.,
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echo 1 > /sys/bus/fsl-mc/rescan
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Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
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---
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drivers/staging/fsl-mc/bus/mc-bus.c | 47 +++++++++++++++++++++++++++++++++++
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1 file changed, 47 insertions(+)
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--- a/drivers/staging/fsl-mc/bus/mc-bus.c
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+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
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@@ -139,11 +139,58 @@ static const struct attribute_group *fsl
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NULL,
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};
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+static int scan_fsl_mc_bus(struct device *dev, void *data)
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+{
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+ unsigned int irq_count;
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+ struct fsl_mc_device *root_mc_dev;
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+ struct fsl_mc_bus *root_mc_bus;
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+
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+ if (fsl_mc_is_root_dprc(dev)) {
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+ root_mc_dev = to_fsl_mc_device(dev);
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+ root_mc_bus = to_fsl_mc_bus(root_mc_dev);
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+ mutex_lock(&root_mc_bus->scan_mutex);
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+ dprc_scan_objects(root_mc_dev, &irq_count);
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+ mutex_unlock(&root_mc_bus->scan_mutex);
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+ }
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+
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+ return 0;
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+}
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+
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+static ssize_t bus_rescan_store(struct bus_type *bus,
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+ const char *buf, size_t count)
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+{
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+ unsigned long val;
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+
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+ if (kstrtoul(buf, 0, &val) < 0)
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+ return -EINVAL;
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+
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+ if (val)
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+ bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
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+
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+ return count;
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+}
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+static BUS_ATTR(rescan, (S_IWUSR | S_IWGRP), NULL, bus_rescan_store);
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+
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+static struct attribute *fsl_mc_bus_attrs[] = {
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+ &bus_attr_rescan.attr,
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+ NULL,
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+};
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+
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+static const struct attribute_group fsl_mc_bus_group = {
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+ .attrs = fsl_mc_bus_attrs,
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+};
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+
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+static const struct attribute_group *fsl_mc_bus_groups[] = {
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+ &fsl_mc_bus_group,
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+ NULL,
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+};
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+
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struct bus_type fsl_mc_bus_type = {
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.name = "fsl-mc",
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.match = fsl_mc_bus_match,
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.uevent = fsl_mc_bus_uevent,
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.dev_groups = fsl_mc_dev_groups,
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+ .bus_groups = fsl_mc_bus_groups,
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};
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EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
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