summaryrefslogtreecommitdiffstats
path: root/drivers/fpga/dfl.c
diff options
context:
space:
mode:
authorWu Hao <hao.wu@intel.com>2018-06-30 02:53:15 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-15 13:55:45 +0200
commit5d56e117001996766c3dab5767663b0c43b76639 (patch)
tree90ca25fdad1af397732654f312f633ed8655fd33 /drivers/fpga/dfl.c
parentfpga: dfl: add chardev support for feature devices (diff)
downloadlinux-5d56e117001996766c3dab5767663b0c43b76639.tar.xz
linux-5d56e117001996766c3dab5767663b0c43b76639.zip
fpga: dfl: add dfl_fpga_cdev_find_port
For feature devices, we need a method to find the port dedicated to the device. This patch adds a function dfl_fpga_cdev_find_port for this purpose. e.g. FPGA Management Engine (FME) Partial Reconfiguration sub feature, it uses this function to find dedicated port on the device for PR function implementation. Signed-off-by: Tim Whisonant <tim.whisonant@intel.com> Signed-off-by: Enno Luebbers <enno.luebbers@intel.com> Signed-off-by: Shiva Rao <shiva.rao@intel.com> Signed-off-by: Christopher Rauer <christopher.rauer@intel.com> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Wu Hao <hao.wu@intel.com> Acked-by: Alan Tull <atull@kernel.org> Acked-by: Moritz Fischer <mdf@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga/dfl.c')
-rw-r--r--drivers/fpga/dfl.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index b56933c64371..68e0b45617b2 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -813,6 +813,38 @@ void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev)
}
EXPORT_SYMBOL_GPL(dfl_fpga_feature_devs_remove);
+/**
+ * __dfl_fpga_cdev_find_port - find a port under given container device
+ *
+ * @cdev: container device
+ * @data: data passed to match function
+ * @match: match function used to find specific port from the port device list
+ *
+ * Find a port device under container device. This function needs to be
+ * invoked with lock held.
+ *
+ * Return: pointer to port's platform device if successful, NULL otherwise.
+ *
+ * NOTE: you will need to drop the device reference with put_device() after use.
+ */
+struct platform_device *
+__dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
+ int (*match)(struct platform_device *, void *))
+{
+ struct dfl_feature_platform_data *pdata;
+ struct platform_device *port_dev;
+
+ list_for_each_entry(pdata, &cdev->port_dev_list, node) {
+ port_dev = pdata->dev;
+
+ if (match(port_dev, data) && get_device(&port_dev->dev))
+ return port_dev;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(__dfl_fpga_cdev_find_port);
+
static int __init dfl_fpga_init(void)
{
int ret;