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From 75b607ff8725eac74f3375b3370f7d121d1827a3 Mon Sep 17 00:00:00 2001
From: Lijun Pan <Lijun.Pan@freescale.com>
Date: Mon, 8 Feb 2016 17:40:14 -0600
Subject: [PATCH 190/226] staging: fsl-mc: root dprc rescan attribute to sync
kernel with MC
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>
[Stuart: resolved merge conflict]
Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
---
drivers/staging/fsl-mc/bus/mc-bus.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
--- a/drivers/staging/fsl-mc/bus/mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
@@ -96,8 +96,37 @@ static ssize_t modalias_show(struct devi
}
static DEVICE_ATTR_RO(modalias);
+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 (!fsl_mc_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_modalias.attr,
+ &dev_attr_rescan.attr,
NULL,
};
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