Quelle  dfl-fme-br.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * FPGA Bridge Driver for FPGA Management Engine (FME)
 *
 * Copyright (C) 2017-2018 Intel Corporation, Inc.
 *
 * Authors:
 *   Wu Hao <hao.wu@intel.com>
 *   Joseph Grecco <joe.grecco@intel.com>
 *   Enno Luebbers <enno.luebbers@intel.com>
 *   Tim Whisonant <tim.whisonant@intel.com>
 *   Ananda Ravuri <ananda.ravuri@intel.com>
 *   Henry Mitchel <henry.mitchel@intel.com>
 */

#include <linux/module.h>
#include <linux/fpga/fpga-bridge.h>

#include "dfl.h"
#include "dfl-fme-pr.h"

struct fme_br_priv {
 struct dfl_fme_br_pdata *pdata;
 struct dfl_fpga_port_ops *port_ops;
 struct dfl_feature_dev_data *port_fdata;
};

static int fme_bridge_enable_set(struct fpga_bridge *bridge, bool enable)
{
 struct fme_br_priv *priv = bridge->priv;
 struct dfl_feature_dev_data *port_fdata;
 struct dfl_fpga_port_ops *ops;

 if (!priv->port_fdata) {
  port_fdata = dfl_fpga_cdev_find_port_data(priv->pdata->cdev,
         &priv->pdata->port_id,
         dfl_fpga_check_port_id);
  if (!port_fdata)
   return -ENODEV;

  priv->port_fdata = port_fdata;
 }

 if (priv->port_fdata && !priv->port_ops) {
  ops = dfl_fpga_port_ops_get(priv->port_fdata);
  if (!ops || !ops->enable_set)
   return -ENOENT;

  priv->port_ops = ops;
 }

 return priv->port_ops->enable_set(priv->port_fdata, enable);
}

static const struct fpga_bridge_ops fme_bridge_ops = {
 .enable_set = fme_bridge_enable_set,
};

static int fme_br_probe(struct platform_device *pdev)
{
 struct device *dev = &pdev->dev;
 struct fme_br_priv *priv;
 struct fpga_bridge *br;

 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 if (!priv)
  return -ENOMEM;

 priv->pdata = dev_get_platdata(dev);

 br = fpga_bridge_register(dev, "DFL FPGA FME Bridge",
      &fme_bridge_ops, priv);
 if (IS_ERR(br))
  return PTR_ERR(br);

 platform_set_drvdata(pdev, br);

 return 0;
}

static void fme_br_remove(struct platform_device *pdev)
{
 struct fpga_bridge *br = platform_get_drvdata(pdev);
 struct fme_br_priv *priv = br->priv;

 fpga_bridge_unregister(br);

 if (priv->port_ops)
  dfl_fpga_port_ops_put(priv->port_ops);
}

static struct platform_driver fme_br_driver = {
 .driver = {
  .name = DFL_FPGA_FME_BRIDGE,
 },
 .probe = fme_br_probe,
 .remove = fme_br_remove,
};

module_platform_driver(fme_br_driver);

MODULE_DESCRIPTION("FPGA Bridge for DFL FPGA Management Engine");
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:dfl-fme-bridge");