fpga: dfl: add chardev support for feature devices

For feature devices drivers, both the FPGA Management Engine (FME) and
Accelerated Function Unit (AFU) driver need to expose user interfaces via
the device file, for example, mmap and ioctls.

This patch adds chardev support in the dfl driver for feature devices,
FME and AFU. It reserves the chardev regions for FME and AFU and provide
interfaces for FME and AFU driver to register their device file operations.

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: Zhang Yi <yi.z.zhang@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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 47ecb3bb6f61..66c2ade5a06b 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -15,6 +15,7 @@
 #define __FPGA_DFL_H
 
 #include <linux/bitfield.h>
+#include <linux/cdev.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/iopoll.h>
@@ -150,6 +151,7 @@ struct dfl_feature {
  *
  * @node: node to link feature devs to container device's port_dev_list.
  * @lock: mutex to protect platform data.
+ * @cdev: cdev of feature dev.
  * @dev: ptr to platform device linked with this platform data.
  * @dfl_cdev: ptr to container device.
  * @disable_count: count for port disable.
@@ -159,6 +161,7 @@ struct dfl_feature {
 struct dfl_feature_platform_data {
         struct list_head node;
         struct mutex lock;
+        struct cdev cdev;
         struct platform_device *dev;
         struct dfl_fpga_cdev *dfl_cdev;
         unsigned int disable_count;
@@ -176,6 +179,11 @@ static inline int dfl_feature_platform_data_size(const int num)
                 num * sizeof(struct dfl_feature);
 }
 
+int dfl_fpga_dev_ops_register(struct platform_device *pdev,
+                              const struct file_operations *fops,
+                              struct module *owner);
+void dfl_fpga_dev_ops_unregister(struct platform_device *pdev);
+
 #define dfl_fpga_dev_for_each_feature(pdata, feature)                       \
         for ((feature) = (pdata)->features;                                 \
            (feature) < (pdata)->features + (pdata)->num; (feature)++)