ANDROID: scsi: ufs: add a hook to add sysfs entries

This patch adds a variant in UFS driver:

int     (*update_sysfs)(struct ufs_hba *hba);
 -> called after creating sysfs for vendor to add more sysfs entries

Bug: 158050260
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Change-Id: Id8c1197ec704e998e89dc25cc69b0f6a1b86e978

drivers/scsi/ufs/ufs-sysfs.c

@@ -854,15 +854,23 @@ const struct attribute_group ufs_sysfs_lun_attributes_group = {
 	.attrs = ufs_sysfs_lun_attributes,
 };
 
-void ufs_sysfs_add_nodes(struct device *dev)
+void ufs_sysfs_add_nodes(struct ufs_hba *hba)
 {
 	int ret;
 
-	ret = sysfs_create_groups(&dev->kobj, ufs_sysfs_groups);
-	if (ret)
-		dev_err(dev,
+	ret = sysfs_create_groups(&hba->dev->kobj, ufs_sysfs_groups);
+	if (ret) {
+		dev_err(hba->dev,
 			"%s: sysfs groups creation failed (err = %d)\n",
 			__func__, ret);
+		return;
+	}
+
+	ret = ufshcd_vops_update_sysfs(hba);
+	if (ret)
+		dev_err(hba->dev,
+			"%s: vops sysfs groups update failed (err = %d)\n",
+			__func__, ret);
 }
 
 void ufs_sysfs_remove_nodes(struct device *dev)

drivers/scsi/ufs/ufs-sysfs.h

@@ -9,7 +9,7 @@
 
 #include "ufshcd.h"
 
-void ufs_sysfs_add_nodes(struct device *dev);
+void ufs_sysfs_add_nodes(struct ufs_hba *hba);
 void ufs_sysfs_remove_nodes(struct device *dev);
 
 extern const struct attribute_group ufs_sysfs_unit_descriptor_group;

drivers/scsi/ufs/ufshcd.c

@@ -9017,7 +9017,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 	ufshcd_set_ufs_dev_active(hba);
 
 	async_schedule(ufshcd_async_scan, hba);
-	ufs_sysfs_add_nodes(hba->dev);
+	ufs_sysfs_add_nodes(hba);
 
 	return 0;
 

drivers/scsi/ufs/ufshcd.h

@@ -285,6 +285,7 @@ struct ufs_pwr_mode_info {
  * @fill_prdt: called after initializing the standard PRDT fields so that any
  *	       variant-specific PRDT fields can be initialized too
  * @prepare_command: called when receiving a request in the first place
+ * @update_sysfs: adds vendor-specific sysfs entries
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -324,6 +325,7 @@ struct ufs_hba_variant_ops {
 			     unsigned int segments);
 	void    (*prepare_command)(struct ufs_hba *hba,
 				struct request *rq, struct ufshcd_lrb *lrbp);
+	int     (*update_sysfs)(struct ufs_hba *hba);
 };
 
 /* clock gating state  */
@@ -1224,6 +1226,13 @@ static inline void ufshcd_vops_prepare_command(struct ufs_hba *hba,
 		hba->vops->prepare_command(hba, rq, lrbp);
 }
 
+static inline int ufshcd_vops_update_sysfs(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->update_sysfs)
+		return hba->vops->update_sysfs(hba);
+	return 0;
+}
+
 extern struct ufs_pm_lvl_states ufs_pm_lvl_states[];
 
 /*