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[71.34.81.131]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2cdb7600054sm12788517a91.47.2024.07.30.08.52.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jul 2024 08:52:08 -0700 (PDT) From: "Gerecke, Jason" X-Google-Original-From: "Gerecke, Jason" To: linux-input@vger.kernel.org, Benjamin Tissoires , Jiri Kosina Cc: Ping Cheng , Joshua Dickens , Erin Skomra , "Tobita, Tatsunosuke" , Jason Gerecke Subject: [PATCH 4/5] HID: wacom: Add preliminary support for high-resolution wheel scrolling Date: Tue, 30 Jul 2024 08:51:58 -0700 Message-ID: <20240730155159.3156-4-jason.gerecke@wacom.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240730155159.3156-1-jason.gerecke@wacom.com> References: <20240730155159.3156-1-jason.gerecke@wacom.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jason Gerecke Modern userspace (i.e. libinput) will make use of high-resolution scrolling if supported. Hardware does not currently set a resolution multiplier needed for effective high-res scrolling, but we can still write code to support it in the future. Signed-off-by: Jason Gerecke --- drivers/hid/wacom_wac.c | 24 ++++++++++++++++++++---- drivers/hid/wacom_wac.h | 1 + 2 files changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index 96b158a94ef9c..e45abc973363a 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -2048,10 +2048,12 @@ static void wacom_wac_pad_usage_mapping(struct hid_device *hdev, features->device_type |= WACOM_DEVICETYPE_PAD; break; case WACOM_HID_WD_TOUCHRING: - if (field->flags & HID_MAIN_ITEM_RELATIVE) - wacom_map_usage(input, usage, field, EV_REL, REL_WHEEL, 0); - else + if (field->flags & HID_MAIN_ITEM_RELATIVE) { + wacom_map_usage(input, usage, field, EV_REL, REL_WHEEL_HI_RES, 0); + set_bit(REL_WHEEL, input->relbit); + } else { wacom_map_usage(input, usage, field, EV_ABS, ABS_WHEEL, 0); + } features->device_type |= WACOM_DEVICETYPE_PAD; break; case WACOM_HID_WD_TOUCHRINGSTATUS: @@ -2179,7 +2181,21 @@ static void wacom_wac_pad_event(struct hid_device *hdev, struct hid_field *field * userspace treats positive REL_WHEEL as a * scroll *up*! */ - value = -value; + int hires_value = -value * 120 / usage->resolution_multiplier; + int *ring_value = &wacom_wac->hid_data.ring_value; + + value = hires_value; + *ring_value += hires_value; + + /* Emulate a legacy wheel click for every 120 + * units of hi-res travel. + */ + if (*ring_value >= 120 || *ring_value <= -120) { + int clicks = *ring_value / 120; + + input_event(input, usage->type, REL_WHEEL, clicks); + *ring_value -= clicks * 120; + } } else { value = wacom_offset_rotation(input, usage, value, 1, 4); diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h index 6ec499841f709..aeba2f3082f03 100644 --- a/drivers/hid/wacom_wac.h +++ b/drivers/hid/wacom_wac.h @@ -312,6 +312,7 @@ struct hid_data { int width; int height; int id; + int ring_value; int cc_report; int cc_index; int cc_value_index;