From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean Delvare Subject: Re: [PATCH v2] i2c: stub: Add support for SMBus block commands Date: Thu, 17 Jul 2014 15:40:20 +0200 Message-ID: <20140717154020.650ad59c@endymion.delvare> References: <1404742983-27303-1-git-send-email-linux@roeck-us.net> <20140717132135.GI2740@katana> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20140717132135.GI2740@katana> Sender: linux-doc-owner@vger.kernel.org To: Wolfram Sang Cc: Guenter Roeck , Randy Dunlap , linux-i2c@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-i2c@vger.kernel.org On Thu, 17 Jul 2014 15:21:35 +0200, Wolfram Sang wrote: > On Mon, Jul 07, 2014 at 07:23:03AM -0700, Guenter Roeck wrote: > > SMBus block commands are different to I2C block commands since > > the returned data is not normally accessible with byte or word > > commands on other command offsets. Add linked list of 'block' > > commands to support those commands. > > > > Access mechanism is quite simple: Block commands must be written > > before they can be read. The first write selects the block length. > > Subsequent writes can be partial. Block read commands always return > > the number of bytes selected with the first write. > > > > Signed-off-by: Guenter Roeck > > --- > > v2: Make new functionality only available on request via functionality > > module parameter > > Add more details about SMBus block mode support to documentation > > Use correct sizeof() variable in devm_kzalloc > > Use stub_find_block() only in SMBus block command itself. > > Store first word of block data in chip->words[]. > > When writing block data and the written data is longer than > > the first write, bail out with debug message indicating the reason > > for the error. > > Thanks for doing this and thanks to Jean for the thorough review. You're welcome. > The thing I miss is the documentation that SMBUS_BLOCK must explicitly > be activated and the description how to do it. A comment in the driver, > above STUB_FUNC_* defines might not hurt as well. Good point. > Also, I'd prefer to squash Jean's "increasing block length" patch into > this one if both of you are fine with that? Yes, I would be perfectly fine with that. Guenter, can you please send an updated patch? -- Jean Delvare SUSE L3 Support