linux-kernel - Re: [PATCH v3 1/3] usb: gadget: storage: Add fsg_get

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Date:	Wed, 11 May 2011 10:49:36 +0300
From:	Roger Quadros <roger.quadros@...ia.com>
To:	ext Michal Nazarewicz <mina86@...a86.com>
CC:	<gregkh@...e.de>, <stern@...land.harvard.edu>,
	<sshtylyov@...sta.com>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] usb: gadget: storage: Add fsg_get_toc helper

Hi,

Looks like I somehow missed this mail.

On 04/05/2011 06:43 PM, ext Michal Nazarewicz wrote:
> On Tue, 05 Apr 2011 16:59:27 +0200, Roger Quadros <roger.quadros@...ia.com> wrote:
>> --- a/drivers/usb/gadget/storage_common.c
>> +++ b/drivers/usb/gadget/storage_common.c
>
>> +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);
>> + buf[1] = len - 2; /* TOC Length excludes length field */
>> + 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;
>
> Useless break. Or, you could put "return len;" at the end of the function.
>
Yes I will fix this.

>> +
>> + case 2:
>> + /* Raw TOC */
>> + len = 4 + 3*11; /* 4 byte header + 3 descriptors */
>> + memset(buf, 0, len); /* Header + A0, A1 & A2 descriptors */
>> + buf[1] = len - 2; /* TOC Length excludes length field */
>> + 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;
>
> Same here.

ok

>
>> + default:
>> + /* Multi-session, PMA, ATIP, CD-TEXT not supported/required */
>> + return -EINVAL;
>
> Can we fall back to the old behaviour here?

What old behaviour? I didn't understand.

>
>> + break;
>
> And here.
>
>> + }
>> +}
>


-- 
regards,
-roger
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