linux-kernel - [PATCH v2] usb: gadget: f_mass_storage: Make CD-ROM emulation works with Windows OS

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Date:   Fri, 24 Jun 2022 10:19:16 +0800
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>
CC:     Roger Quadros <roger.quadros@...ia.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Matthew Wilcox <willy@...radead.org>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <BMC-SW@...eedtech.com>
Subject: [PATCH v2] usb: gadget: f_mass_storage: Make CD-ROM emulation works with Windows OS

Add read TOC with format 1 to support CD-ROM emulation with
Windows OS.
This patch is tested on Windows OS Server 2019.

Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
---
 drivers/usb/gadget/function/f_mass_storage.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
index 3a77bca0ebe1..9edf76c22605 100644
--- a/drivers/usb/gadget/function/f_mass_storage.c
+++ b/drivers/usb/gadget/function/f_mass_storage.c
@@ -1209,7 +1209,8 @@ static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh)
 
 	switch (format) {
 	case 0:
-		/* Formatted TOC */
+	case 1:
+		/* Formatted TOC, Session info */
 		len = 4 + 2*8;		/* 4 byte header + 2 descriptors */
 		memset(buf, 0, len);
 		buf[1] = len - 2;	/* TOC Length excludes length field */
@@ -1250,7 +1251,7 @@ static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh)
 		return len;
 
 	default:
-		/* Multi-session, PMA, ATIP, CD-TEXT not supported/required */
+		/* PMA, ATIP, CD-TEXT not supported/required */
 		curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
 		return -EINVAL;
 	}
-- 
2.25.1