linux-kernel - Re: [PATCH 2/3] Input: elan_i2c - Use PM subsystem to manage wake irq

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Message-ID: <YcE+xrSnS7qw0G1/@google.com>
Date:   Mon, 20 Dec 2021 18:41:10 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Raul E Rangel <rrangel@...omium.org>
Cc:     linux-kernel@...r.kernel.org, mario.limonciello@....com,
        linux-input@...r.kernel.org, dianders@...omium.org,
        "jingle.wu" <jingle.wu@....com.tw>
Subject: Re: [PATCH 2/3] Input: elan_i2c - Use PM subsystem to manage wake irq

Hi Raul,

On Mon, Dec 20, 2021 at 04:43:45PM -0700, Raul E Rangel wrote:
> @@ -1368,11 +1367,13 @@ static int elan_probe(struct i2c_client *client,
>  	}
>  
>  	/*
> -	 * Systems using device tree should set up wakeup via DTS,
> +	 * Systems using device tree or ACPI should set up wakeup via DTS/ACPI,
>  	 * the rest will configure device as wakeup source by default.
>  	 */
> -	if (!dev->of_node)
> +	if (!dev->of_node && !ACPI_COMPANION(dev)) {

I think this will break our Rambis that use ACPI for enumeration but
actually lack _PRW. As far as I remember their trackpads were capable
of waking up the system.

I think we should remove this chunk completely and instead add necessary
code to drivers/platform/chrome/chrome-laptop.c (I suppose we need to
have additional member in struct acpi_peripheral to indicate whether
device needs to be configured for wakeup and then act upon it in
chromeos_laptop_adjust_client().

>  		device_init_wakeup(dev, true);
> +		dev_pm_set_wake_irq(dev, client->irq);
> +	}
>  
>  	return 0;
>  }

Thanks.

-- 
Dmitry