linux-kernel - Re: [PATCH 3/3] Input - elantech: Add special check for fw

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Message-ID: <20150805180818.GD3603@dtor-ws>
Date:	Wed, 5 Aug 2015 11:08:18 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	duson <dusonlin@....com.tw>, ulrik.debie-os@...ig.org
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Input - elantech: Add special check for fw_version
 0x470f01 touchpad

Hi Ulrik,

On Sun, Aug 02, 2015 at 12:16:41PM +0800, duson wrote:
> It is no need to check the packet[0] for sanity check when doing
> elantech_packet_check_v4() function for fw_version = 0x470f01 touchpad.
>

Are you OK with this version?

Thanks!

> Signed-off by: Duson Lin <dusonlin@....com.tw>
> ---
>  drivers/input/mouse/elantech.c |   28 +++++++++++++++++++++++++---
>  drivers/input/mouse/elantech.h |    1 +
>  2 files changed, 26 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
> index 22b9ca9..5bc3d55 100644
> --- a/drivers/input/mouse/elantech.c
> +++ b/drivers/input/mouse/elantech.c
> @@ -785,6 +785,9 @@ static int elantech_packet_check_v4(struct psmouse *psmouse)
>  	unsigned char packet_type = packet[3] & 0x03;
>  	bool sanity_check;
> 
> +	/* This represents the version of IC body. */
> +	int ver = (etd->fw_version & 0x0f0000) >> 16;
> +
>  	if (etd->tp_dev && (packet[3] & 0x0f) == 0x06)
>  		return PACKET_TRACKPOINT;
> 
> @@ -796,9 +799,17 @@ static int elantech_packet_check_v4(struct psmouse *psmouse)
>  	 */
>  	if (etd->crc_enabled)
>  		sanity_check = ((packet[3] & 0x08) == 0x00);
> -	else
> -		sanity_check = ((packet[0] & 0x0c) == 0x04 &&
> -				(packet[3] & 0x1c) == 0x10);
> +	else {
> +		/*
> +		 * The sanity check only need to check packet[3]
> +		 * when IC_body = 7 and PID = 0x2A
> +		 */
> +		if (ver == 7 && etd->samples[1] == 0x2A)
> +			sanity_check = ((packet[3] & 0x1c) == 0x10);
> +		else
> +			sanity_check = ((packet[0] & 0x0c) == 0x04 &&
> +					(packet[3] & 0x1c) == 0x10);
> +	}

I'd write this as:

	if (etd->crc_enabled)
		sanity_check = ((packet[3] & 0x08) == 0x00);
	else if (ver == 7 && etd->samples[1] == 0x2A)
		sanity_check = ((packet[3] & 0x1c) == 0x10);
	else
		sanity_check = ((packet[0] & 0x0c) == 0x04 &&
				(packet[3] & 0x1c) == 0x10);

> 
>  	if (!sanity_check)
>  		return PACKET_UNKNOWN;
> @@ -1116,6 +1127,7 @@ static int elantech_get_resolution_v4(struct psmouse *psmouse,
>   * Avatar AVIU-145A2       0x361f00        ?               clickpad
>   * Fujitsu LIFEBOOK E544   0x470f00        d0, 12, 09      2 hw buttons
>   * Fujitsu LIFEBOOK E554   0x570f01        40, 14, 0c      2 hw buttons
> + * Fujitsu T725	           0x470f01        05, 12, 09      2 hw buttons
>   * Fujitsu H730            0x570f00        c0, 14, 0c      3 hw buttons (**)
>   * Gigabyte U2442          0x450f01        58, 17, 0c      2 hw buttons
>   * Lenovo L430             0x350f02        b9, 15, 0c      2 hw buttons (*)
> @@ -1651,6 +1663,16 @@ int elantech_init(struct psmouse *psmouse)
>  		     etd->capabilities[0], etd->capabilities[1],
>  		     etd->capabilities[2]);
> 
> +	if (etd->hw_version != 1) {
> +		if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, etd->samples)) {
> +			psmouse_err(psmouse, "failed to query sample data\n");
> +			goto init_fail;
> +		}
> +		psmouse_info(psmouse,
> +			    "Elan sample query result %02x, %02x, %02x\n",
> +			    etd->samples[0], etd->samples[1], etd->samples[2]);
> +	}
> +
>  	if (elantech_set_absolute_mode(psmouse)) {
>  		psmouse_err(psmouse,
>  			    "failed to put touchpad into absolute mode.\n");
> diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h
> index f965d15..e1cbf40 100644
> --- a/drivers/input/mouse/elantech.h
> +++ b/drivers/input/mouse/elantech.h
> @@ -129,6 +129,7 @@ struct elantech_data {
>  	unsigned char reg_26;
>  	unsigned char debug;
>  	unsigned char capabilities[3];
> +	unsigned char samples[3];
>  	bool paritycheck;
>  	bool jumpy_cursor;
>  	bool reports_pressure;
> --
> 

Thanks.

-- 
Dmitry
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