Date:   Mon, 7 Aug 2017 22:24:20 +0800
From:   廖崇榮 <kt.liao@....com.tw>
To:     <ulrik.debie-os@...ig.org>
Cc:     <linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>,
        <dmitry.torokhov@...il.com>, <phoenix@....com.tw>
Subject: RE: [PATCH] Input: elantech - support new touchpad IC and extend elan's touchapd command Origianl ic-body field is not sufficient for upcoming IC, Elan ps/2 driver extend the fomation to support future IC. Signed-off-by: KT Liao <kt.liao@....com.tw>

Hi Ulrik,
Thanks your review, I add comment in below.

-----Original Message-----
From: ulrik.debie-os@...ig.org [mailto:ulrik.debie-os@...ig.org] 
Sent: Friday, August 04, 2017 4:52 AM
To: KT Liao
Cc: linux-kernel@...r.kernel.org; linux-input@...r.kernel.org;
dmitry.torokhov@...il.com; phoenix@....com.tw
Subject: Re: [PATCH] Input: elantech - support new touchpad IC and extend
elan's touchapd command Origianl ic-body field is not sufficient for
upcoming IC, Elan ps/2 driver extend the fomation to support future IC.
Signed-off-by: KT Liao <kt.liao@....com.tw>

Hi,

Something went wrong with your subject line, it also includes the further
commit message lines and the signed off line ..

Origianl -> Original
fomation .. Do you mean information ?
[KT]:Fix typo and subject line in next patch
On Wed, Aug 02, 2017 at 07:11:41PM +0800, KT Liao wrote:
> 
> ---
>  drivers/input/mouse/elantech.c | 28 ++++++++++++++++++++++++----  
> drivers/input/mouse/elantech.h |  3 +++
>  2 files changed, 27 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/input/mouse/elantech.c 
> b/drivers/input/mouse/elantech.c index 65c9de3..14ab5ba 100644
> --- a/drivers/input/mouse/elantech.c
> +++ b/drivers/input/mouse/elantech.c
> @@ -1398,6 +1398,10 @@ static bool elantech_is_signature_valid(const
unsigned char *param)
>  	    param[2] < 40)
>  		return true;
>  
> +	/* hw_version 0x0F does not need to check rate alose*/

Drop the word also:
[KT] : OK

 /* hw_version 0x0F does not need to check rate */

> +	if ((param[0] & 0x0f) == 0x0f)
> +		return true;
> +
>  	for (i = 0; i < ARRAY_SIZE(rates); i++)
>  		if (param[2] == rates[i])
>  			return false;
> @@ -1576,7 +1580,7 @@ static const struct dmi_system_id 
> no_hw_res_dmi_table[] = {
>  /*
>   * determine hardware version and set some properties according to it.
>   */
> -static int elantech_set_properties(struct elantech_data *etd)
> +static int elantech_set_properties(struct elantech_data *etd, struct 
> +psmouse *psmouse)

Isn't the line too long for this one ?

>  {
>  	/* This represents the version of IC body. */
>  	int ver = (etd->fw_version & 0x0f0000) >> 16; @@ -1593,14 +1597,14 
> @@ static int elantech_set_properties(struct elantech_data *etd)
>  		case 5:
>  			etd->hw_version = 3;
>  			break;
> -		case 6 ... 14:
> +		case 6 ... 15:
>  			etd->hw_version = 4;
>  			break;
>  		default:
>  			return -1;
>  		}
>  	}

Remove this tab on a line alone you added below ..
[KT]:OK

> -
> +	
>  	/* decide which send_cmd we're gonna use early */
>  	etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd :
>  					       synaptics_send_cmd;
I would propose to place the lines below (up to the end of function
elantech_set_properties) in elantech_init instead of
elantech_set_properties. 
[KT]: OK, it's better to move my part to elantech_init and skip psmouse
parameter.


> @@ -1634,6 +1638,22 @@ static int elantech_set_properties(struct
elantech_data *etd)
>  	/* Enable real hardware resolution on hw_version 3 ? */
>  	etd->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);
>  
> +	/*if ver == 15 and info_pattern == 0x01, it is ELAN new pattern
> +	 *which support a command for extend IC_body/FW_Version reading
> +	 */
> +	etd->info_pattern = etd->fw_version & 0xFF;
> +	if (ver == 0x0F && etd->info_pattern == 0x01) {
I really appreciate the message that is given in the comment. 
Why would you store the lowest byte of fw_version once more as an int .. and
use it only once at exactly the next line ..

Alternatives I see are: 
1) Merge the two lines (so there is no info_pattern anymore)
2) Use a local variable info_pattern to store it intermediately
3) Have some macro that basically takes the lowest byte (I can't immediately
find a good example for this one)
[KT] I will use a local UCHAR info_pattern for it .

> +		if (etd->send_cmd(psmouse, ETP_ICBODY_QUERY, etd->icbody)) {
> +			psmouse_err(psmouse, "failed to query icbody
data\n");
> +			return -1;
> +		}
> +		psmouse_info(psmouse,
> +				"Elan ICBODY query result %02x, %02x,
%02x\n",
> +				etd->icbody[0], etd->icbody[1],
etd->icbody[2]);
> +		etd->fw_version	&= 0xFFFF00;
> +		etd->fw_version |= etd->icbody[2];

Brr, this throws away information. Is icbody2 really meant to replace bottom
byte of fw_version ? I see no benefit of doing this ! I would propose to
drop the above 2 lines that alter fw_version.
[KT] icbody2 will be the real fw version in upcoming HW, it's only useful
when we really need to check it.
>From vendor's view, original etd->fw_version is not fw-versoin. It contain
many information in it. 

I agree with your point that some information is not useful now.
How about that if I only modify below part this time to support new IC, I
think it's simple and won't cause confuse.
> -		case 6 ... 14:
> +		case 6 ... 15:

And add more information reading once we really need it in future patch.
Please let me know you thought. thanks

> +	}
> +
>  	return 0;
>  }
>  
> @@ -1667,7 +1687,7 @@ int elantech_init(struct psmouse *psmouse)
>  	}
>  	etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
>  
> -	if (elantech_set_properties(etd)) {
> +	if (elantech_set_properties(etd, psmouse)) {

When those lines are moved to elantech_init, you don't need to add the
psmouse paramater.

>  		psmouse_err(psmouse, "unknown hardware version,
aborting...\n");
>  		goto init_fail;
>  	}
> diff --git a/drivers/input/mouse/elantech.h 
> b/drivers/input/mouse/elantech.h index e1cbf40..708ad85 100644
> --- a/drivers/input/mouse/elantech.h
> +++ b/drivers/input/mouse/elantech.h
> @@ -21,6 +21,7 @@
>  #define ETP_CAPABILITIES_QUERY		0x02
>  #define ETP_SAMPLE_QUERY		0x03
>  #define ETP_RESOLUTION_QUERY		0x04
> +#define ETP_ICBODY_QUERY		0x05
>  
>  /*
>   * Command values for register reading or writing @@ -130,6 +131,7 @@ 
> struct elantech_data {
>  	unsigned char debug;
>  	unsigned char capabilities[3];
>  	unsigned char samples[3];
> +	unsigned char icbody[3];
>  	bool paritycheck;
>  	bool jumpy_cursor;
>  	bool reports_pressure;
> @@ -140,6 +142,7 @@ struct elantech_data {
>  	unsigned int single_finger_reports;
>  	unsigned int y_max;
>  	unsigned int width;
> +	unsigned int info_pattern;

So I would propose to remove this one.

>  	struct finger_pos mt[ETP_MAX_FINGERS];
>  	unsigned char parity[256];
>  	int (*send_cmd)(struct psmouse *psmouse, unsigned char c, unsigned 
> char *param);
> --
> 2.7.4

Kind regards,
Ulrik

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