fpga: dfl: fme: add DFL_FPGA_GET_API_VERSION/CHECK_EXTENSION ioctls support

DFL_FPGA_GET_API_VERSION and DFL_FPGA_CHECK_EXTENSION ioctls are common
ones which need to be supported by all feature devices drivers including
FME and AFU. Userspace application can use these ioctl interfaces to get
the API info and check if specific extension is supported or not in
current driver.

This patch implements above 2 ioctls in FPGA Management Engine (FME)
driver.

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>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
index c23c56fe3f4b..c83ff88e3bbb 100644
--- a/drivers/fpga/dfl-fme-main.c
+++ b/drivers/fpga/dfl-fme-main.c
@@ -16,6 +16,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/fpga-dfl.h>
 
 #include "dfl.h"
 
@@ -116,6 +117,13 @@ static struct dfl_feature_driver fme_feature_drvs[] = {
         },
 };
 
+static long fme_ioctl_check_extension(struct dfl_feature_platform_data *pdata,
+                                      unsigned long arg)
+{
+        /* No extension support for now */
+        return 0;
+}
+
 static int fme_open(struct inode *inode, struct file *filp)
 {
         struct platform_device *fdev = dfl_fpga_inode_to_feature_dev(inode);
@@ -156,6 +164,10 @@ static long fme_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
         dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd);
 
         switch (cmd) {
+        case DFL_FPGA_GET_API_VERSION:
+                return DFL_FPGA_API_VERSION;
+        case DFL_FPGA_CHECK_EXTENSION:
+                return fme_ioctl_check_extension(pdata, arg);
         default:
                 /*
                  * Let sub-feature's ioctl function to handle the cmd.