linux-kernel - Re: [PATCH 2/2] Input: elan_i2c - Modify the IAP related functio n for page sizes 128, 512 bytes.

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Date:   Thu, 16 Jul 2020 23:10:10 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     "jingle.wu" <jingle.wu@....com.tw>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        linux-input <linux-input@...r.kernel.org>,
        phoenix <phoenix@....com.tw>, "josh.chen" <josh.chen@....com.tw>,
        "kai.heng.feng" <kai.heng.feng@...onical.com>
Subject: Re: [PATCH 2/2] Input: elan_i2c - Modify the IAP related functio n
 for page sizes 128, 512 bytes.

On Thu, Jul 16, 2020 at 06:27:19PM -0700, Dmitry Torokhov wrote:
> Hi Jingle,
> 
> On Thu, Jul 16, 2020 at 02:15:23PM +0800, jingle.wu wrote:
> > HI Dmitry:
> > 
> > Just to confirm, the older devices (I assume that pattern 0 means older)
> >  have version command that is numerically higher than the one for the
> >  newer (pattern >= 1) devices?
> > 
> > >> Yes, Pattern 1, 2 are newer devices.
> > 
> > > @@ -324,7 +342,14 @@ static int elan_i2c_get_sm_version(struct i2c_client *client,
> > >  			return error;
> > >  		}
> > >  		*version = val[0];
> > > -		*ic_type = val[1];
> > > +
> > > +		error = elan_i2c_read_cmd(client, ETP_I2C_IAP_VERSION_CMD, val);
> > > +		if (error) {
> > > +			dev_err(&client->dev, "failed to get ic type: %d\n",
> > > +				error);
> > > +			return error;
> > > +		}
> > 
> > Could you please tell me why this chunk is needed?
> > >> Modify the old pattern IC firmware read the correct ic_type.
> > 
> > In the elan_i2c_core.c, move this code to elan_i2c_i2c.c. 
> > static int elan_query_device_info(struct elan_tp_data *data)
> > {
> > 	.....
> > 	if (data->pattern == 0x01)
> > 		ic_type = data->ic_type;
> > 	else
> > 		ic_type = data->iap_version;
> > 	.....
> > 	return 0;
> > }
> 
> I am concerned that unconditionally substituting iap_version for ic_type
> for "pattern 0" devices will break check in
> elan_check_ASUS_special_fw() as it operates on the ic_type returned by
> ETP_I2C_OSM_VERSION_CMD and not iap_version.

I split the firmware handling code into a few patches and uploaded it
to a new elan-i2c branch:

https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git elan-i2c

Please take a look and let me know if I messed it up or not. I will be
looking at the new packet format next.

Thanks.

-- 
Dmitry