From patchwork Tue May 11 20:16:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Link Mauve X-Patchwork-Id: 12252017 X-Patchwork-Delegate: jikos@jikos.cz Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A31B3C43461 for ; Tue, 11 May 2021 20:16:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 65B2561879 for ; Tue, 11 May 2021 20:16:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230002AbhEKURX (ORCPT ); Tue, 11 May 2021 16:17:23 -0400 Received: from 82-65-109-163.subs.proxad.net ([82.65.109.163]:37954 "EHLO luna.linkmauve.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229917AbhEKURW (ORCPT ); Tue, 11 May 2021 16:17:22 -0400 Received: by luna.linkmauve.fr (Postfix, from userid 1000) id 7E6F1F4063C; Tue, 11 May 2021 22:16:13 +0200 (CEST) From: Emmanuel Gil Peyrot To: linux-input@vger.kernel.org Cc: Emmanuel Gil Peyrot , Ash Logan , =?utf-8?q?Jonathan_Neusch=C3=A4fer?= , =?utf-8?q?Barnab?= =?utf-8?q?=C3=A1s_P=C5=91cze?= , Jiri Kosina , Benjamin Tissoires , linux-kernel@vger.kernel.org Subject: [PATCH v2 3/4] HID: wiiu-drc: Add accelerometer, gyroscope and magnetometer readings Date: Tue, 11 May 2021 22:16:03 +0200 Message-Id: <20210511201604.23204-4-linkmauve@linkmauve.fr> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210511201604.23204-1-linkmauve@linkmauve.fr> References: <20210511201604.23204-1-linkmauve@linkmauve.fr> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org These are mostly untested so far, because I have no idea which userland to test against, but evtest at least seems to give sensible values. The magnetometer doesn’t have dedicated INPUT_PROP_ACCELEROMETER buttons, so I used three clearly invalid absolute values, in the hope that someone will fix that eventually. Another solution might be to go for the iio subsystem instead, but then it wouldn’t be tied to the HID any longer and I would feel uneasy about that. Especially because multiple such gamepads could be connected to a single computer. Signed-off-by: Ash Logan Signed-off-by: Emmanuel Gil Peyrot --- drivers/hid/hid-wiiu-drc.c | 77 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 74 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-wiiu-drc.c b/drivers/hid/hid-wiiu-drc.c index 33c02d3494aa..a631d405119e 100644 --- a/drivers/hid/hid-wiiu-drc.c +++ b/drivers/hid/hid-wiiu-drc.c @@ -63,15 +63,25 @@ #define TOUCH_BORDER_X 100 #define TOUCH_BORDER_Y 200 +/* Accelerometer, gyroscope and magnetometer constants */ +#define ACCEL_MIN -(1 << 15) +#define ACCEL_MAX ((1 << 15) - 1) +#define GYRO_MIN -(1 << 23) +#define GYRO_MAX ((1 << 23) - 1) +#define MAGNET_MIN -(1 << 15) +#define MAGNET_MAX ((1 << 15) - 1) + /* * The device is setup with multiple input devices: * - A joypad with the buttons and sticks. * - The touch area which works as a touchscreen. + * - An accelerometer + gyroscope + magnetometer device. */ struct drc { struct input_dev *joy_input_dev; struct input_dev *touch_input_dev; + struct input_dev *accel_input_dev; struct hid_device *hdev; }; @@ -87,7 +97,7 @@ static int drc_raw_event(struct hid_device *hdev, struct hid_report *report, u8 *data, int len) { struct drc *drc = hid_get_drvdata(hdev); - int i, x, y, pressure, base; + int i, x, y, z, pressure, base; u32 buttons; if (len != 128) @@ -182,6 +192,31 @@ static int drc_raw_event(struct hid_device *hdev, struct hid_report *report, } input_sync(drc->touch_input_dev); + /* accelerometer */ + x = (data[16] << 8) | data[15]; + y = (data[18] << 8) | data[17]; + z = (data[20] << 8) | data[19]; + input_report_abs(drc->accel_input_dev, ABS_X, (int16_t)x); + input_report_abs(drc->accel_input_dev, ABS_Y, (int16_t)y); + input_report_abs(drc->accel_input_dev, ABS_Z, (int16_t)z); + + /* gyroscope */ + x = (data[23] << 24) | (data[22] << 16) | (data[21] << 8); + y = (data[26] << 24) | (data[25] << 16) | (data[24] << 8); + z = (data[29] << 24) | (data[28] << 16) | (data[27] << 8); + input_report_abs(drc->accel_input_dev, ABS_RX, x >> 8); + input_report_abs(drc->accel_input_dev, ABS_RY, y >> 8); + input_report_abs(drc->accel_input_dev, ABS_RZ, z >> 8); + + /* magnetometer */ + x = (data[31] << 8) | data[30]; + y = (data[33] << 8) | data[32]; + z = (data[35] << 8) | data[34]; + input_report_abs(drc->accel_input_dev, ABS_THROTTLE, (int16_t)x); + input_report_abs(drc->accel_input_dev, ABS_RUDDER, (int16_t)y); + input_report_abs(drc->accel_input_dev, ABS_WHEEL, (int16_t)z); + input_sync(drc->accel_input_dev); + /* let hidraw and hiddev handle the report */ return 0; } @@ -297,6 +332,40 @@ static bool drc_setup_touch(struct drc *drc, return true; } +static bool drc_setup_accel(struct drc *drc, + struct hid_device *hdev) +{ + struct input_dev *input_dev; + + input_dev = allocate_and_setup(hdev, DEVICE_NAME " accelerometer, gyroscope and magnetometer"); + if (!input_dev) + return false; + + drc->accel_input_dev = input_dev; + + set_bit(INPUT_PROP_ACCELEROMETER, input_dev->propbit); + + /* 1G accel is reported as about -7900 */ + input_set_abs_params(input_dev, ABS_X, ACCEL_MIN, ACCEL_MAX, 0, 0); + input_set_abs_params(input_dev, ABS_Y, ACCEL_MIN, ACCEL_MAX, 0, 0); + input_set_abs_params(input_dev, ABS_Z, ACCEL_MIN, ACCEL_MAX, 0, 0); + + /* gyroscope */ + input_set_abs_params(input_dev, ABS_RX, GYRO_MIN, GYRO_MAX, 0, 0); + input_set_abs_params(input_dev, ABS_RY, GYRO_MIN, GYRO_MAX, 0, 0); + input_set_abs_params(input_dev, ABS_RZ, GYRO_MIN, GYRO_MAX, 0, 0); + + /* magnetometer */ + /* TODO: Figure out which ABS_* would make more sense to expose, or + * maybe go for the iio subsystem? + */ + input_set_abs_params(input_dev, ABS_THROTTLE, MAGNET_MIN, MAGNET_MAX, 0, 0); + input_set_abs_params(input_dev, ABS_RUDDER, MAGNET_MIN, MAGNET_MAX, 0, 0); + input_set_abs_params(input_dev, ABS_WHEEL, MAGNET_MIN, MAGNET_MAX, 0, 0); + + return true; +} + static int drc_probe(struct hid_device *hdev, const struct hid_device_id *id) { struct drc *drc; @@ -317,7 +386,8 @@ static int drc_probe(struct hid_device *hdev, const struct hid_device_id *id) } if (!drc_setup_joypad(drc, hdev) || - !drc_setup_touch(drc, hdev)) { + !drc_setup_touch(drc, hdev) || + !drc_setup_accel(drc, hdev)) { hid_err(hdev, "could not allocate interfaces\n"); return -ENOMEM; } @@ -329,7 +399,8 @@ static int drc_probe(struct hid_device *hdev, const struct hid_device_id *id) } ret = input_register_device(drc->joy_input_dev) || - input_register_device(drc->touch_input_dev); + input_register_device(drc->touch_input_dev) || + input_register_device(drc->accel_input_dev); if (ret) { hid_err(hdev, "failed to register interfaces\n"); return ret;