linux-kernel - Re: [PATCH] Input: trackpoint - Add Suspend mode for Elan TrackPoint

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Message-ID: <YjtYgoBvytgQu/pn@google.com>
Date:   Wed, 23 Mar 2022 10:27:30 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     "jingle.wu" <jingle.wu@....com.tw>
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        phoenix@....com.tw,
        "jingle.wu" <jingle.wu@...n.corp-partner.google.com>
Subject: Re: [PATCH] Input: trackpoint - Add Suspend mode for Elan TrackPoint

Hi Jingle,

On Fri, Sep 04, 2020 at 10:42:31AM +0800, jingle.wu wrote:
> From: "jingle.wu" <jingle.wu@...n.corp-partner.google.com>
> 
> Add suspend command for elan trackpoint

Could you please elaborate what this mode does to the trackpint?

Also, your signed-off-by is missing.

> ---
>  drivers/input/mouse/trackpoint.c | 16 ++++++++++++++++
>  drivers/input/mouse/trackpoint.h |  1 +
>  2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/input/mouse/trackpoint.c b/drivers/input/mouse/trackpoint.c
> index 3eefee2ee2a1..b3cba973a4eb 100644
> --- a/drivers/input/mouse/trackpoint.c
> +++ b/drivers/input/mouse/trackpoint.c
> @@ -389,6 +389,20 @@ static int trackpoint_reconnect(struct psmouse *psmouse)
>  	return 0;
>  }
>  
> +static void trackpoint_cleanup(struct psmouse *psmouse)
> +{
> +	struct trackpoint_data *tp = psmouse->private;
> +	u8 param[3] = { TP_TOGGLE, TP_TOGGLE_BURST, TP_TOGGLE_ELAN_SLEEP };
> +
> +	if (tp->variant_id == TP_VARIANT_ELAN) {
> +		if (ps2_command(&psmouse->ps2dev, param,

I'd combine the 2 "ifs".

> +				MAKE_PS2_CMD(3, 0, TP_COMMAND))) {
> +			psmouse_err(psmouse,

psmouse_warn() since it is not a hard error.

> +				    "failed to suspend trackpont.\n");

I'd say "failed to suspend Elan trackpont\n".

> +		}
> +	}
> +}
> +
>  int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
>  {
>  	struct ps2dev *ps2dev = &psmouse->ps2dev;
> @@ -421,6 +435,8 @@ int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
>  	psmouse->reconnect = trackpoint_reconnect;
>  	psmouse->disconnect = trackpoint_disconnect;
>  
> +	psmouse->cleanup = trackpoint_cleanup;
> +
>  	if (variant_id != TP_VARIANT_IBM) {
>  		/* Newer variants do not support extended button query. */
>  		button_info = 0x33;
> diff --git a/drivers/input/mouse/trackpoint.h b/drivers/input/mouse/trackpoint.h
> index 5cb93ed26085..c7fa75452976 100644
> --- a/drivers/input/mouse/trackpoint.h
> +++ b/drivers/input/mouse/trackpoint.h
> @@ -107,6 +107,7 @@
>  #define TP_TOGGLE_EXT_TAG	0x22	/* Bit 3 of the first packet coming from the
>  					   external device will be forced to 1 */
>  #define TP_MASK_EXT_TAG			0x04
> +#define TP_TOGGLE_ELAN_SLEEP	0x8

It seems to me that TP_TOGGLE_ELAN_SLEEP is a bit in TP_TOGGLE_BURST
subcommand, so it is better to move it next to TP_MASK_BURST and call it
TP_MASK_ELAN_SLEEP to match the rest.

Thanks.

-- 
Dmitry