From 417d71b1e291725c01893bf1553478924d05952f Mon Sep 17 00:00:00 2001 From: Lijun Pan Date: Mon, 8 Feb 2016 17:40:16 -0600 Subject: [PATCH 191/226] staging: fsl-mc: bus rescan attribute to sync kernel with MC 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 --- drivers/staging/fsl-mc/bus/mc-bus.c | 47 +++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) --- a/drivers/staging/fsl-mc/bus/mc-bus.c +++ b/drivers/staging/fsl-mc/bus/mc-bus.c @@ -139,11 +139,58 @@ static const struct attribute_group *fsl NULL, }; +static int scan_fsl_mc_bus(struct device *dev, void *data) +{ + unsigned int irq_count; + struct fsl_mc_device *root_mc_dev; + struct fsl_mc_bus *root_mc_bus; + + if (fsl_mc_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, &irq_count); + 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);