[PATCH v2 3/3] usb: gadget: f_fs: make numbers in ep file names the same as ep addresses

[Robert Baldyga]

This patch adds FUNCTIONFS_ADDR_NAMES flag to user flags set in
descriptors, which makes numbers in endpoint file names the same as
value of bEndpointAddress in endpoint descriptor. It simplifies endpoint
handling, because now it can be refered using one unique number.

Numbers are in hexadecimal format to have each name of the same lenght,
and to simplify debugging. The first digit can be 0 or 8 which means
OUT or IN endpoint direction, and the second digit is simply hexadecimal
value of endpoint number (which is between 1 and 15).

It needed to store user flags to the moment of endpoint files creation,
and for this reason there is new field in struct ffs_data named user_flags.

Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
---
 drivers/usb/gadget/f_fs.c           | 11 ++++++++---
 drivers/usb/gadget/u_fs.h           |  2 ++
 include/uapi/linux/usb/functionfs.h |  1 +
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index a2e18cc..0b8040b 100644
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -1550,8 +1550,11 @@ static int ffs_epfiles_create(struct ffs_data *ffs)
 		epfile->ffs = ffs;
 		mutex_init(&epfile->mutex);
 		init_waitqueue_head(&epfile->wait);
-		sprintf(epfiles->name, "ep%u",
-			ffs->eps_addrmap[i] & USB_ENDPOINT_NUMBER_MASK);
+		if (ffs->user_flags & FUNCTIONFS_ADDR_NAMES)
+			sprintf(epfiles->name, "ep%02x", ffs->eps_addrmap[i]);
+		else
+			sprintf(epfiles->name, "ep%u",
+				ffs->eps_addrmap[i] & USB_ENDPOINT_NUMBER_MASK);
 		if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile,
 						 &ffs_epfile_operations,
 						 &epfile->dentry))) {
@@ -1912,9 +1915,11 @@ static int __ffs_data_got_descs(struct ffs_data *ffs,
 		break;
 	case FUNCTIONFS_DESCRIPTORS_MAGIC_V2:
 		flags = get_unaligned_le32(data + 8);
+		ffs->user_flags = flags;
 		if (flags & ~(FUNCTIONFS_HAS_FS_DESC |
 			      FUNCTIONFS_HAS_HS_DESC |
-			      FUNCTIONFS_HAS_SS_DESC)) {
+			      FUNCTIONFS_HAS_SS_DESC |
+			      FUNCTIONFS_ADDR_NAMES)) {
 			ret = -ENOSYS;
 			goto error;
 		}
diff --git a/drivers/usb/gadget/u_fs.h b/drivers/usb/gadget/u_fs.h
index fe31eba..adc6568 100644
--- a/drivers/usb/gadget/u_fs.h
+++ b/drivers/usb/gadget/u_fs.h
@@ -217,6 +217,8 @@ struct ffs_data {
 	unsigned			hs_descs_count;
 	unsigned			ss_descs_count;
 
+	unsigned			user_flags;
+
 	u8				eps_addrmap[15];
 
 	unsigned short			strings_count;
diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h
index 1ab6f06..a29d910 100644
--- a/include/uapi/linux/usb/functionfs.h
+++ b/include/uapi/linux/usb/functionfs.h
@@ -18,6 +18,7 @@ enum functionfs_flags {
 	FUNCTIONFS_HAS_FS_DESC = 1,
 	FUNCTIONFS_HAS_HS_DESC = 2,
 	FUNCTIONFS_HAS_SS_DESC = 4,
+	FUNCTIONFS_ADDR_NAMES = 8,
 };
 
 #ifndef __KERNEL__
-- 
1.9.1

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