usb: gadget: storage_common: make attribute operations more generic

Show/store methods for sysfs attributes contain code which can be used
also by configfs. Make them abstract the source the lun and rw_semaphore
are taken from.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 6 insertions, 25 deletions

diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 3e2500f19140..969948dc2596 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -31,11 +31,6 @@
 
 #include "storage_common.h"
 
-static inline struct fsg_lun *fsg_lun_from_dev(struct device *dev)
-{
-	return container_of(dev, struct fsg_lun, dev);
-}
-
 /* There is only one interface. */
 
 struct usb_interface_descriptor fsg_intf_desc = {
@@ -324,31 +319,23 @@ EXPORT_SYMBOL(store_cdrom_address);
 /*-------------------------------------------------------------------------*/
 
 
-ssize_t fsg_show_ro(struct device *dev, struct device_attribute *attr,
-		    char *buf)
+ssize_t fsg_show_ro(struct fsg_lun *curlun, char *buf)
 {
-	struct fsg_lun	*curlun = fsg_lun_from_dev(dev);
-
 	return sprintf(buf, "%d\n", fsg_lun_is_open(curlun)
 				  ? curlun->ro
 				  : curlun->initially_ro);
 }
 EXPORT_SYMBOL(fsg_show_ro);
 
-ssize_t fsg_show_nofua(struct device *dev, struct device_attribute *attr,
-		       char *buf)
+ssize_t fsg_show_nofua(struct fsg_lun *curlun, char *buf)
 {
-	struct fsg_lun	*curlun = fsg_lun_from_dev(dev);
-
 	return sprintf(buf, "%u\n", curlun->nofua);
 }
 EXPORT_SYMBOL(fsg_show_nofua);
 
-ssize_t fsg_show_file(struct device *dev, struct device_attribute *attr,
+ssize_t fsg_show_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 		      char *buf)
 {
-	struct fsg_lun	*curlun = fsg_lun_from_dev(dev);
-	struct rw_semaphore	*filesem = dev_get_drvdata(dev);
 	char		*p;
 	ssize_t		rc;
 
@@ -373,12 +360,10 @@ ssize_t fsg_show_file(struct device *dev, struct device_attribute *attr,
 EXPORT_SYMBOL(fsg_show_file);
 
 
-ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
+ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 		     const char *buf, size_t count)
 {
 	ssize_t		rc;
-	struct fsg_lun	*curlun = fsg_lun_from_dev(dev);
-	struct rw_semaphore	*filesem = dev_get_drvdata(dev);
 	unsigned	ro;
 
 	rc = kstrtouint(buf, 2, &ro);
@@ -404,10 +389,8 @@ ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
 }
 EXPORT_SYMBOL(fsg_store_ro);
 
-ssize_t fsg_store_nofua(struct device *dev, struct device_attribute *attr,
-			const char *buf, size_t count)
+ssize_t fsg_store_nofua(struct fsg_lun *curlun, const char *buf, size_t count)
 {
-	struct fsg_lun	*curlun = fsg_lun_from_dev(dev);
 	unsigned	nofua;
 	int		ret;
 
@@ -425,11 +408,9 @@ ssize_t fsg_store_nofua(struct device *dev, struct device_attribute *attr,
 }
 EXPORT_SYMBOL(fsg_store_nofua);
 
-ssize_t fsg_store_file(struct device *dev, struct device_attribute *attr,
+ssize_t fsg_store_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 		       const char *buf, size_t count)
 {
-	struct fsg_lun	*curlun = fsg_lun_from_dev(dev);
-	struct rw_semaphore	*filesem = dev_get_drvdata(dev);
 	int		rc = 0;
 
 	if (curlun->prevent_medium_removal && fsg_lun_is_open(curlun)) {