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Sun, 13 Sep 2026 16:33:27 -0700 (PDT) Received: from google.com ([2a00:79e0:2ebe:8:a739:376c:7eb4:ea2d]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-14365b347e6sm19771080c88.4.2026.09.13.16.33.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Sep 2026 16:33:26 -0700 (PDT) Date: Sun, 13 Sep 2026 16:33:23 -0700 From: Dmitry Torokhov To: David Heidelberg Cc: linux-input@vger.kernel.org Subject: Re: Double tap to wake optionality Message-ID: References: <4f9e942c-823e-4ab1-81ed-184b5f8388d6@ixit.cz> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4f9e942c-823e-4ab1-81ed-184b5f8388d6@ixit.cz> Hi David, On Mon, Sep 07, 2026 at 12:02:12AM +0200, David Heidelberg wrote: > Hello! > > Most of touchscreens has ability to jump into low power mode and get woken > up by gesture (such as double tap). > > I wonder about suggestion what property should drivers use to implement this > policy where driver doesn't have to jump into low-power mode but completely > power-off (and save battery). My thinking was something such as > > /sys/class/input/inputX/gesture_to_wake > (while gesture sounds a bit weird, it seems that TS are capable to recognize > different patterns, not only double-tap). > > > userspace > │ > │ gesture_to_wake = 1 > ▼ > touchscreen driver > │ > ┌────────────┴────────────┐ > │ │ > gesture ON gesture OFF > │ │ > ▼ ▼ > low-power TS mode complete power-off > │ > ▼ > IRQ configured > as wake source How is it different from the power/wakeup device attribute? Device's suspend routines check device_may_wakeup() and then either completely power off controllers or configure them for wake up. How exactly wakeup is handled - any touch, or double-tap, or something else - is up to the controller and its firmware. Thanks. -- Dmitry