linux-kernel - Re: [PATCH 4/4 v2] Input: mms114

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Message-ID: <20180126192549.g3kwn7amb7bkndgg@dtor-ws>
Date:   Fri, 26 Jan 2018 11:25:49 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Andi Shyti <andi.shyti@...sung.com>
Cc:     Marcus Folkesson <marcus.folkesson@...il.com>,
        Simon Shields <simon@...eageos.org>,
        Rob Herring <robh@...nel.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4 v2] Input: mms114 - add support for mms152

On Fri, Jan 26, 2018 at 02:14:38PM +0900, Andi Shyti wrote:
> Hi Simon and Dmitry,
> 
> On Wed, Jan 24, 2018 at 01:32:01PM -0800, Dmitry Torokhov wrote:
> > From: Simon Shields <simon@...eageos.org>
> > 
> > MMS152 has no configuration registers, but the packet format used in
> > interrupts is identical to mms114.
> > 
> > Signed-off-by: Simon Shields <simon@...eageos.org>
> > Patchwork-Id: 10125841
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> 
> also here
> 
> Reviewed-by: Andi Shyti <andi.shyti@...sung.com>
> Tested-by: Andi Shyti <andi.shyti@...sung.com>
> 
> one small nitpick:
> 
> > @@ -239,14 +249,33 @@ static int mms114_get_version(struct mms114_data *data)
> >  {
> >  	struct device *dev = &data->client->dev;
> >  	u8 buf[6];
> > +	int group;
> >  	int error;
> 
> do we really need to define a new 'group' variable?

I like it, that's why I added it ;)

As Marcus mentioned, we cant use 'buf' to store the value as buf is
unsigned and i2c_smbus_read_byte_data() may return negative error code.
And I do not want to use 'error' variable because logically we are
trying to get group value, not error. Hence a dedicated variable. It's
gonna be optimized away anyway.

Thanks.

> 
> Andi
> 
> > -	error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf);
> > -	if (error < 0)
> > -		return error;
> > +	switch (data->type) {
> > +	case TYPE_MMS152:
> > +		error = __mms114_read_reg(data, MMS152_FW_REV, 3, buf);
> > +		if (error)
> > +			return error;
> > +
> > +		group = i2c_smbus_read_byte_data(data->client,
> > +						  MMS152_COMPAT_GROUP);
> > +		if (group < 0)
> > +			return group;
> > +
> > +		dev_info(dev, "TSP FW Rev: bootloader 0x%x / core 0x%x / config 0x%x, Compat group: %c\n",
> > +			 buf[0], buf[1], buf[2], group);
> > +		break;
> > +
> > +	case TYPE_MMS114:
> > +		error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf);
> > +		if (error)
> > +			return error;
> >  
> > -	dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n",
> > -		 buf[0], buf[1], buf[3]);
> > +		dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n",
> > +			 buf[0], buf[1], buf[3]);
> > +		break;
> > +	}
> >  
> >  	return 0;
> >  }

-- 
Dmitry