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Subject: Re: [PATCH 2/2] MEMSTICK: Add driver for Ricoh R5C592 Card reader.
From: Maxim Levitsky <maximlevitsky@gmail.com>
To: Alex Dubov <oakad@yahoo.com>
Cc: LKML <linux-kernel@vger.kernel.org>
In-Reply-To: <397573.48417.qm@web37608.mail.mud.yahoo.com>
References: <397573.48417.qm@web37608.mail.mud.yahoo.com>
Content-Type: text/plain; charset="UTF-8"
Date: Mon, 09 Aug 2010 22:19:08 +0300
Message-ID: <1281381548.22777.39.camel@maxim-laptop>
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Sender: linux-kernel-owner@vger.kernel.org
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About INT bits, I still don't understand them exactly.

First of all we have 4 meaningful bits.
In parallel mode these are exposed on data lines, in serial mode only 
MEMSTICK_INT_CED is.
And I can always send MS_TPC_GET_INT or just read the registers.

#define MEMSTICK_INT_CMDNAK 0x01
#define MEMSTICK_INT_BREQ   0x20
#define MEMSTICK_INT_ERR    0x40
#define MEMSTICK_INT_CED    0x80


Now, I send a command to device, say MS_CMD_BLOCK_READ.
What bits I need to poll until I can be sure that command is completed?

Also the MEMSTICK_INT_BREQ tells that input is available in firmware
buffer (to read using TPC_READ_LONG_DATA)?


Is that true that MEMSTICK_INT_BREQ is a summary of fifo full/empty bits
in status0?

And same about MEMSTICK_INT_ERR and status1.

I try my best to create a driver that actually works, simple, and error
free, even in unusual conditions.
Thats why I am asking all these questions.

Thanks for help,
Best regards,
Maxim Levitsky

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