Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753201Ab1CUK43 (ORCPT ); Mon, 21 Mar 2011 06:56:29 -0400 Received: from smtp.nokia.com ([147.243.1.47]:64629 "EHLO mgw-sa01.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753016Ab1CUK41 (ORCPT ); Mon, 21 Mar 2011 06:56:27 -0400 From: Roger Quadros To: gregkh@suse.de Cc: stern@rowland.harvard.edu, sshtylyov@mvista.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] usb: gadget: storage: Add fsg_get_toc helper Date: Mon, 21 Mar 2011 12:59:17 +0200 Message-Id: <1300705159-24386-2-git-send-email-roger.quadros@nokia.com> X-Mailer: git-send-email 1.6.0.4 In-Reply-To: <1300705159-24386-1-git-send-email-roger.quadros@nokia.com> References: <1300705159-24386-1-git-send-email-roger.quadros@nokia.com> X-Nokia-AV: Clean Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3442 Lines: 101 From: Roger Quadros fsg_get_toc can be used by both storage gadgets to build a CD-ROM Table of Contents which can be used as data for READ_TOC command. Currently fsg_get_toc supports two TOC formats, i.e. format 0: Formatted TOC and format 2: Raw TOC. Raw TOC is required for CD-ROM emulation to work with Mac OS-X. Signed-off-by: Roger Quadros --- drivers/usb/gadget/storage_common.c | 68 +++++++++++++++++++++++++++++++++++ 1 files changed, 68 insertions(+), 0 deletions(-) diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c index b015561..d47f148 100644 --- a/drivers/usb/gadget/storage_common.c +++ b/drivers/usb/gadget/storage_common.c @@ -655,6 +655,74 @@ static void store_cdrom_address(u8 *dest, int msf, u32 addr) } } +/** + * fsg_get_toc() - Builds a TOC with required format @format. + * @curlun: The LUN for which the TOC has to be built + * @msf: Min Sec Frame format or LBA format for address + * @format: TOC format code + * @buf: The buffer into which the TOC is built + * + * Builds a Table of Content which can be used as data for READ_TOC command. + * The TOC simulates a single session, single track CD-ROM mode 1 disc. + * + * Returns number of bytes written to @buf, -EINVAL if format not supported. + */ +static int fsg_get_toc(struct fsg_lun *curlun, int msf, int format, u8 *buf) +{ + int i, len; + switch (format) { + case 0: + /* Formatted TOC */ + len = 4 + 2*8; /* 4 byte header + 2 descriptors */ + memset(buf, 0, len); + len -= 2; /* TOC Length excludes length field */ + buf[1] = len; /* TOC data length */ + buf[2] = 1; /* First track number */ + buf[3] = 1; /* Last track number */ + buf[5] = 0x16; /* Data track, copying allowed */ + buf[6] = 0x01; /* Only track is number 1 */ + store_cdrom_address(&buf[8], msf, 0); + + buf[13] = 0x16; /* Lead-out track is data */ + buf[14] = 0xAA; /* Lead-out track number */ + store_cdrom_address(&buf[16], msf, curlun->num_sectors); + return len; + break; + + case 2: + /* Raw TOC */ + len = 4 + 3*11; /* 4 byte header + 3 descriptors */ + memset(buf, 0, len); /* Header + A0, A1 & A2 descriptors */ + len -= 2; /* TOC Length excludes length field */ + buf[1] = len; /* TOC data length */ + buf[2] = 1; /* First complete session */ + buf[3] = 1; /* Last complete session */ + + buf += 4; + /* fill in A0, A1 and A2 points */ + for (i = 0; i < 3; i++) { + buf[0] = 1; /* Session number */ + buf[1] = 0x16; /* Data track, copying allowed */ + /* 2 - Track number 0 -> TOC */ + buf[3] = 0xA0 + i; /* A0, A1, A2 point */ + /* 4, 5, 6 - Min, sec, frame is zero */ + buf[8] = 1; /* Pmin: last track number */ + buf += 11; /* go to next track descriptor */ + } + buf -= 11; /* go back to A2 descriptor */ + + /* For A2, 7, 8, 9, 10 - zero, Pmin, Psec, Pframe of Lead out */ + store_cdrom_address(&buf[7], msf, curlun->num_sectors); + + return len; + break; + default: + /* Multi-session, PMA, ATIP, CD-TEXT not supported/required */ + return -EINVAL; + break; + } +} + /*-------------------------------------------------------------------------*/ -- 1.6.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/