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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Message-ID: <002c01d65c14$bccb9c10$3662d430$@emc.com.tw>
Date:   Fri, 17 Jul 2020 16:31:58 +0800
From:   "jingle" <jingle.wu@....com.tw>
To:     "'Dmitry Torokhov'" <dmitry.torokhov@...il.com>
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.

Hi Dmitry:

1. 

In this function elan_get_fwinfo().

+static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u8 pattern,
+			   u16 *validpage_count, u32 *signature_address,
+			   u16 *page_size)
 {
-	switch (ic_type) {
+	u16 type = pattern >= 0x01 ? ic_type : iap_version;
+
+	switch (type) {

This iap_version in pattern0 is read from this command
ETP_I2C_IAP_VERSION_CMD_OLD ,it is not from this command
ETP_I2C_IAP_VERSION.
So u16 type = pattern >= 0x01 ? ic_type : iap_version; <- wrong

2. In this "static int elan_i2c_prepare_fw_update(struct i2c_client *client,
u16 ic_type, u8 iap_version)" function.
The ic is old pattern must be modify correct ic_type. (cmd is
ETP_I2C_IAP_VERSION)

THANKS


-----Original Message-----
From: jingle [mailto:jingle.wu@....com.tw] 
Sent: Friday, July 17, 2020 4:20 PM
To: 'Dmitry Torokhov'
Cc: 'linux-kernel'; 'linux-input'; 'phoenix'; 'josh.chen'; 'kai.heng.feng'
Subject: RE: [PATCH 2/2] Input: elan_i2c - Modify the IAP related functio n
for page sizes 128, 512 bytes.

Hi Dmitry:

In this "static int elan_i2c_prepare_fw_update(struct i2c_client *client,
u16 ic_type, u8 iap_version)" function If IC is old_pattern, it must be
modified to iap_version
	-> u16 type = pattern >= 0x01 ? ic_type : iap_version;

Thanks

-----Original Message-----
From: Dmitry Torokhov [mailto:dmitry.torokhov@...il.com]
Sent: Friday, July 17, 2020 2:10 PM
To: jingle.wu
Cc: linux-kernel; linux-input; phoenix; josh.chen; kai.heng.feng
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