From patchwork Thu Jan 11 22:03:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Morgan X-Patchwork-Id: 762062 Received: from mail-oa1-f42.google.com (mail-oa1-f42.google.com [209.85.160.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A229F5820D for ; Thu, 11 Jan 2024 22:03:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Ys2b9q+x" Received: by mail-oa1-f42.google.com with SMTP id 586e51a60fabf-205f223639fso3459544fac.2 for ; Thu, 11 Jan 2024 14:03:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1705010623; x=1705615423; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=ny1O22scj7yyurpBziyhmRkqeBcEhatzHZFKPveBnIA=; b=Ys2b9q+x0IwHlvJbfQhiTMMuvcO0kXZgDEPzXIxX+LLCIqyZBRCfZ8UsW7Aj+kKC6h G2olZObHOQuefXUvs0fKL9+95jfig/ebWP9icurSRqai+8T2PDJoS1/F/Fk0B+BerGi0 38J6iQ53VJwFTePg++o0HL9yq1J2JRTrs3ElCvAl2ArsXsRNqf1vRP0lbjxuaVpncxPX HEFbWK1xHJG/ddgJF6Qem9fdy8M/9pgQv6+daWCOa8xhgcEdiV+g1VcIPgU52WbPstad 4ESWnVNHyPZ76w2pBAG5lLsyo63L3Io0NbO5NlFpoNrehb/8JVdq3rl8wJz3LHEyJ06R w3zQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705010623; x=1705615423; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=ny1O22scj7yyurpBziyhmRkqeBcEhatzHZFKPveBnIA=; b=idwjB/yXVIhw4QEHT+jEDjYPLhGVMTB9BzIadohqt8+Ok/p5I+sD2rxZ9VQ8oseb9w HRhzUspXYEAZDo/3QXWoZkNu5RyimeeNKJ8Z++Vow7qdOVkwewZzC4aaS1pZ4W0KSD4i XO1qvANhASjDsreKtAFpl6L7nIDPwJ6ZySIPXLTg8rHDngsjZx5re2WKHveP7hzpgWTO TLrOnIqwzelFp6PwJAo1ymJisFXebKL4LDyN02iaZwThbKveLx/yr/EnHCbxIK1VCua8 DSKreUUF4S46sOj5AkiXvuNrGL5UECiGTulotlwgds/twmeKHGGmgnsQTNS6Ucnj5VwK IrEw== X-Gm-Message-State: AOJu0YzHphVjUrvxRWzaU4zyzPbbhX14yC/nylBSyHovxHrCLBLBSMY8 9SWpvkm86rvR/p4PpUt6LjX2kj0oicVLOQ== X-Google-Smtp-Source: AGHT+IEAf8EQyhAxXt7s+JDv9Go9SlMmgV2wXOeoy10V53yGt+b8F0tiTwGeZgddFAEGwRhdI+9vrQ== X-Received: by 2002:a05:6871:410b:b0:204:3793:27e8 with SMTP id la11-20020a056871410b00b00204379327e8mr490112oab.58.1705010623517; Thu, 11 Jan 2024 14:03:43 -0800 (PST) Received: from localhost.localdomain ([75.28.21.198]) by smtp.gmail.com with ESMTPSA id d6-20020a9d51c6000000b006dc81d1d203sm319909oth.73.2024.01.11.14.03.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Jan 2024 14:03:43 -0800 (PST) From: Chris Morgan To: linux-input@vger.kernel.org Cc: dmitry.torokhov@gmail.com, hdegoede@redhat.com, paul@crapouillou.net, peter.hutterer@who-t.net, svv@google.com, biswarupp@google.com, contact@artur-rojek.eu, Chris Morgan Subject: [PATCH V2] Input: adc-joystick: Handle inverted axes Date: Thu, 11 Jan 2024 16:03:33 -0600 Message-Id: <20240111220333.66060-1-macroalpha82@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Chris Morgan When one or more axes are inverted, (where min > max), normalize the data so that min < max and invert the values reported to the input stack. This ensures we can continue defining the device correctly in the device tree while not breaking downstream assumptions that min is always less than max. Changes since V1: - Moved proposed helper for inversion from input stack to adc-joystick driver. Signed-off-by: Chris Morgan --- drivers/input/joystick/adc-joystick.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/input/joystick/adc-joystick.c b/drivers/input/joystick/adc-joystick.c index c0deff5d4282..46197ebd3564 100644 --- a/drivers/input/joystick/adc-joystick.c +++ b/drivers/input/joystick/adc-joystick.c @@ -18,6 +18,7 @@ struct adc_joystick_axis { s32 range[2]; s32 fuzz; s32 flat; + bool inverted; }; struct adc_joystick { @@ -29,6 +30,14 @@ struct adc_joystick { bool polled; }; +static int adc_joystick_invert(struct input_dev *dev, unsigned int axis, int val) +{ + int min = dev->absinfo[axis].minimum; + int max = dev->absinfo[axis].maximum; + + return (max + min) - val; +} + static void adc_joystick_poll(struct input_dev *input) { struct adc_joystick *joy = input_get_drvdata(input); @@ -38,6 +47,8 @@ static void adc_joystick_poll(struct input_dev *input) ret = iio_read_channel_raw(&joy->chans[i], &val); if (ret < 0) return; + if (joy->axes[i].inverted) + val = adc_joystick_invert(input, i, val); input_report_abs(input, joy->axes[i].code, val); } input_sync(input); @@ -86,6 +97,8 @@ static int adc_joystick_handle(const void *data, void *private) val = sign_extend32(val, msb); else val &= GENMASK(msb, 0); + if (joy->axes[i].inverted) + val = adc_joystick_invert(joy->input, i, val); input_report_abs(joy->input, joy->axes[i].code, val); } @@ -168,11 +181,17 @@ static int adc_joystick_set_axes(struct device *dev, struct adc_joystick *joy) goto err_fwnode_put; } + if (axes[i].range[0] > axes[i].range[1]) { + dev_dbg(dev, "abs-axis %d inverted\n", i); + axes[i].inverted = 1; + } + fwnode_property_read_u32(child, "abs-fuzz", &axes[i].fuzz); fwnode_property_read_u32(child, "abs-flat", &axes[i].flat); input_set_abs_params(joy->input, axes[i].code, - axes[i].range[0], axes[i].range[1], + min_array(axes[i].range, 2), + max_array(axes[i].range, 2), axes[i].fuzz, axes[i].flat); input_set_capability(joy->input, EV_ABS, axes[i].code); }