From 75b607ff8725eac74f3375b3370f7d121d1827a3 Mon Sep 17 00:00:00 2001 From: Lijun Pan 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 [Stuart: resolved merge conflict] Signed-off-by: Stuart Yoder --- 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, };