[RFC PATCH v2 3/3] Register auxiliary device for PCIe enclosure management

[Stuart Hayes <stuart.w.hayes@gmail.com>]

This patch will register an auxiliary devivce for the pcie_em driver,
allowing it to attach and provide access to PCIe enclosure management
(LEDs), if present.

Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com>
---
 drivers/nvme/host/pci.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index ca2ee806d74b..22ff10798333 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -27,6 +27,8 @@
 #include <linux/io-64-nonatomic-hi-lo.h>
 #include <linux/sed-opal.h>
 #include <linux/pci-p2pdma.h>
+#include <linux/auxiliary_bus.h>
+#include <linux/pcie_em.h>
 
 #include "trace.h"
 #include "nvme.h"
@@ -159,6 +161,9 @@ struct nvme_dev {
 	unsigned int nr_poll_queues;
 
 	bool attrs_added;
+
+	/* auxiliary_device for pcie_em driver (LEDs) */
+	struct auxiliary_device *pcie_em_auxdev;
 };
 
 static int io_queue_depth_set(const char *val, const struct kernel_param *kp)
@@ -2838,6 +2843,11 @@ static void nvme_reset_work(struct work_struct *work)
 		nvme_unfreeze(&dev->ctrl);
 	}
 
+	/*
+	 * register auxiliary device if this supports PCIe enclosure management
+	 */
+	dev->pcie_em_auxdev = register_pcie_em_auxdev(dev->dev, dev->ctrl.instance);
+
 	/*
 	 * If only admin queue live, keep it to do further investigation or
 	 * recovery.
@@ -3135,6 +3145,7 @@ static void nvme_remove(struct pci_dev *pdev)
 	nvme_free_queues(dev, 0);
 	nvme_release_prp_pools(dev);
 	nvme_dev_unmap(dev);
+	unregister_pcie_em_auxdev(dev->pcie_em_auxdev);
 	nvme_uninit_ctrl(&dev->ctrl);
 }
 
-- 
2.31.1