From patchwork Sun May 26 21:24:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleh Kuzhylnyi X-Patchwork-Id: 800109 Received: from mail-ej1-f45.google.com (mail-ej1-f45.google.com [209.85.218.45]) (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 9714A13A259; Sun, 26 May 2024 21:24:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716758691; cv=none; b=PttQ0eS6j5BxJ4qTpEjWPw0yGNjQGS1Nuw3K4ZGL5TI1WO0Ev5xGPNoAHM548Pd354HGb84Tf2XrYYP69p0HLtcXtVRD9Zw/xOqnr8h20Z3Cxv2O1cvJFYYufIAKTxkxcrF7Pu7uxgW8wadYMBzArN2H4joZcVZfA99Usrl3cNU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716758691; c=relaxed/simple; bh=oeEP4ygQRGenE4hVSLTsl2TaoTbK+XgklW7Ivx2ujiU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=A9/3RXKZZn1lw6VffkYibZVrNNXxeGEslwUp/MmYYxaBYDxchaJHoARw7k2EyGSuSCMrN6ohft7NYs38VUIdD2Ah0xSXhif2PFVyyvO7L7ABola0JNhEI1VuxCzFCmRXSIBxEeogs1Qc08507aMSAtyYharZq8vVgicx0BEiAOw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=CRfEYSyN; arc=none smtp.client-ip=209.85.218.45 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="CRfEYSyN" Received: by mail-ej1-f45.google.com with SMTP id a640c23a62f3a-a59a609dd3fso838913466b.0; Sun, 26 May 2024 14:24:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1716758688; x=1717363488; 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=y+dEpyyCSvCFW4rqJdqF5eNr6betO3sf3jn2avdoLW0=; b=CRfEYSyNzk9+CGsj2TmyINP06MvLDZ2/zTjnJ4todz76f8VGZDnx0QqFGoEmzComRS 6it/b9qzFQGDLK5BzTtdgEyfc4vdyUxM7bLCHSWXeUmjgUbE2oYFrQckh+GnzDZbAg91 QEGoafmKe/jBgSeHFexlzIV+rQ5aB/6WO3u7/vzM9E+ZQJ2v2urRhvn4feZJP+17otfl xFbDaV+uOVGMJNb2PbJwgvx8qvksBlamUikh1Pc2yyvyL0B3+1yQI0qNTTz2AAV8Lt2A ridm9pta6c0f5m/4k6hJ0l2j5EP7JNugYkDZfCd6iQNj6unX9Xky1/zYU29XvEfH3i/T 9PpA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716758688; x=1717363488; 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=y+dEpyyCSvCFW4rqJdqF5eNr6betO3sf3jn2avdoLW0=; b=uWQBWwKNTPt6FXjB85ym9x0JDWUOzz02v8RH0GeGJl+QQaioyi2MFOI54Jge8t1hsc Rk9ZvaWQ3L9yllfEjDsILG8/LgrZLV11nn16HAYC9Z7NNgEVhhtldQ5slr3hogBdslE+ o0Rl3q7CH6pq9d3PKeAbtj6o/sQehxaNWkqdl/du2p/58jQwCGMgmyKcKq8EKGrjitG0 Cf76wycWlm2mfQBdeD8+N1IawH75XdQlZmG7QiJhHyawrSt3rXQjEBv8EhgMu6dbWUhV Riwuc1DRShExN/zrHHbJ7BGgELZse1zDuIwWEtCgexSPY6SvrXNBPh/IdhDxfxGO4weV 30iw== X-Forwarded-Encrypted: i=1; AJvYcCWWKou/L3l7+39gspvt2wLh/v/6R8Ahj2P+dsfyz2NdtAgY0unZOMn5pGcmjSdjXuBRICjoYjle6gYO1XSWQfM74cXdbeSxu9vqUBoyreyUSfx3qW9yQM+PVvz8ERtF/iCmboabw0pEGA== X-Gm-Message-State: AOJu0Yzd6DElkSvSkaNQn+rpBzk3M/SKq60E6MF7aBjSw7AXs73s4+7m KquY05HbgXLh9uYrnLs8+oIrmtQD0/wQSOyXagAyi7aPmg2FuAbBmGCDvg== X-Google-Smtp-Source: AGHT+IExnpFoRBz8DfWymbraINrBAcfwwG8y93kzm2NnY6cqpxtoo2KOZnOUi6GecDN1adqlHeF1kQ== X-Received: by 2002:a17:906:358e:b0:a62:49ae:cd7b with SMTP id a640c23a62f3a-a626250ddcemr689759966b.24.1716758687647; Sun, 26 May 2024 14:24:47 -0700 (PDT) Received: from kuzhyl-vm.. (89-64-18-73.dynamic.chello.pl. [89.64.18.73]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a626c817088sm418093066b.24.2024.05.26.14.24.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 May 2024 14:24:47 -0700 (PDT) From: Oleh Kuzhylnyi To: linux-input@vger.kernel.org Cc: dmitry.torokhov@gmail.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, kuzhylol@gmail.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, jeff@labundy.com, neil.armstrong@linaro.org, hdegoede@redhat.com, artur.serhiienko@gmail.com, igor.opaniuk@gmail.com Subject: [PATCH v3 1/2] dt-bindings: input: touchscreen: add Hynitron CST816X Date: Sun, 26 May 2024 23:24:41 +0200 Message-Id: <20240526212443.8496-1-kuzhylol@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 Add documentation for the Hynitron CST816X touchscreen bindings. Signed-off-by: Oleh Kuzhylnyi --- Changes in v3: - Rename filename to hynitron,cst816s.yaml - Update description with display details .../input/touchscreen/hynitron,cst816s.yaml | 57 +++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816s.yaml diff --git a/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816s.yaml b/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816s.yaml new file mode 100644 index 000000000000..ac9f1d8e8fc0 --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816s.yaml @@ -0,0 +1,57 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/touchscreen/hynitron,cst816s.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Hynitron CST816S Touchscreen controller + +description: + Hynitron CST816S Touchscreen controller for 1.28-inch 240x240 Resolution + Touch LCD Display Module + +maintainers: + - Oleh Kuzhylnyi + +allOf: + - $ref: touchscreen.yaml# + +properties: + compatible: + enum: + - hynitron,cst816s + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + reset-gpios: + maxItems: 1 + +additionalProperties: false + +required: + - compatible + - reg + - interrupts + - reset-gpios + +examples: + - | + #include + #include + i2c { + #address-cells = <1>; + #size-cells = <0>; + touchscreen@15 { + compatible = "hynitron,cst816s"; + reg = <0x15>; + interrupt-parent = <&gpio0>; + interrupts = <4 IRQ_TYPE_EDGE_RISING>; + reset-gpios = <&gpio 17 GPIO_ACTIVE_LOW>; + }; + }; + +... From patchwork Sun May 26 21:24:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Oleh Kuzhylnyi X-Patchwork-Id: 799135 Received: from mail-ed1-f53.google.com (mail-ed1-f53.google.com [209.85.208.53]) (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 C798F139D00; Sun, 26 May 2024 21:24:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.53 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716758696; cv=none; b=eZxyDAEML4DqvAyFlwS0gA56Xpn888n+YabW+WIC16z4dkgyoQ+aNddyQRJGipfb4RhQ1IfP7Hd/gNJixbPzcD1CfKHjUE+YLpnrAwYM4uzoyik792L1+srTSobeYxnot8yGvghWRX5503zzeqeZmdtsAHUnfyeDRGBGzcHfHng= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716758696; c=relaxed/simple; bh=uZ39KIbWJ8d7A2MhC1kIGNvMH8Bm0uXEpnAWuCr8jPE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=fod79wLXOF2jg/ocqSnskHzYlwBhiE1A87dRti1wK3QL41EJ57x4M6/n4W1Axa+J7Fmx69q6gc7kTpRux8NXzFauXVXD9fc8hrXgGgCru65SbfexCN99UnCCpyG5O4X1DxZcKM0JwXuFOWS8N1OrPCH1SG3774QsBdUSYN0wLYI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Rt1rDe5W; arc=none smtp.client-ip=209.85.208.53 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="Rt1rDe5W" Received: by mail-ed1-f53.google.com with SMTP id 4fb4d7f45d1cf-57857e0f45cso2480709a12.1; Sun, 26 May 2024 14:24:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1716758693; x=1717363493; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ZD4KnpsZe+1fwVEBLmQxNQ3vyqVmLh7NO03oOECCVqY=; b=Rt1rDe5WmdKKfmtGIGYbmhUf1SGBqDpi11ZBPj5YpY2+ppCAWFGi8XfZq6NYmpfdVq Pyvqwjjq34pSh0X5xAg0oSeUauxmY2ZAJZFB1PvkpYWleUVKzTtj18BcEL7WaJM6BYm7 Ak3rrZFgaE+8NmXb6LSDAwKcPzWcRMJ32JkpHkKlC7Fo+BxmoQxxtcm6MtWhp3cRPcCu HCydGGngHOYV3A3JVMcYumrwU8yj5K5CyT64wSERAv9XqsKQz2rEJtdcZJIkQkb3meZG Kkgc+0Cz0HVDVJPHsBOTuQA0HUslg5NNUkDozhibJLNxoemv9NbWYqM6MUzG9fZSLime Eyxw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716758693; x=1717363493; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ZD4KnpsZe+1fwVEBLmQxNQ3vyqVmLh7NO03oOECCVqY=; b=todPJ2CENy0pwXc7luCYnMKTLdLLfz5qyUv3a3996Eusp6aN9krbgLR4JAvdHC1X1V ZJmuR1ytZHhhNyyTkp5nFxxM/K/vyeCHzOHeWxKd1To877GjcrBwS7+R5/0yfcLVuUBx 8pUAC+Y/UMrKv8LXMVs7KTdNJNDuNhmu7pUzPcZ4wqU25+y3hWoeFsEabgXXplFW5CcW P0Yg0Pn92V5RSmcDi1ybR6ku4vbvXudUPwenofy2H2bzORFnFcLoqoedfPk+hVJZgd+s AiCcsKIs4RUqzEq4uumtqgib1M/t+Dq9HJ+aNgqHfUoj8Gul7ixTeHDLZbMLl6lePbkh HQLQ== X-Forwarded-Encrypted: i=1; AJvYcCVI5MB2wDN5wWyxk4bZtRh2TZmrN6rF/06JKRDjngjKn+EucRiT+1zbMVM4aLycAdOsrWoSjHYKrox7u6tS6u5Q6AIahIZaTGNrXL5qZKxyBjD9PyfminViMCSGBb80F+o55scOCsGgAw== X-Gm-Message-State: AOJu0YztndJJXbzqJodg19/hHbGiCHjZcg02mvIvESaRR87eOr3OZXse gU1YU04nZcnh0LfFmZ0xcC3IHItcvtxp3U24Dv9t4N9tJFrZiGL+Pk+Hjw== X-Google-Smtp-Source: AGHT+IGIJlRzEMS916ayVUC+xxdHJmNW7PpZcdIayTPguYZyK9+umiNlNW8nUJicT5Qj1uR7hJdF3Q== X-Received: by 2002:a17:907:971c:b0:a62:cecd:26e3 with SMTP id a640c23a62f3a-a62cecd2767mr227821366b.39.1716758692795; Sun, 26 May 2024 14:24:52 -0700 (PDT) Received: from kuzhyl-vm.. (89-64-18-73.dynamic.chello.pl. [89.64.18.73]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a626c817088sm418093066b.24.2024.05.26.14.24.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 May 2024 14:24:52 -0700 (PDT) From: Oleh Kuzhylnyi To: linux-input@vger.kernel.org Cc: dmitry.torokhov@gmail.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, kuzhylol@gmail.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, jeff@labundy.com, neil.armstrong@linaro.org, hdegoede@redhat.com, artur.serhiienko@gmail.com, igor.opaniuk@gmail.com Subject: [PATCH v3 2/2] input: add driver for Hynitron CST816X touchscreen Date: Sun, 26 May 2024 23:24:42 +0200 Message-Id: <20240526212443.8496-2-kuzhylol@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240526212443.8496-1-kuzhylol@gmail.com> References: <20240526212443.8496-1-kuzhylol@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Introduce support for the Hynitron CST816X touchscreen controller used for 240×240 1.28-inch Round LCD Display Module manufactured by Waveshare Electronics. The driver is designed based on an Arduino implementation marked as under MIT License. This driver is written for a particular round display based on the CST816S controller, which is not compatiable with existing driver for Hynitron controllers. Signed-off-by: Oleh Kuzhylnyi --- Changes in v3: - Drop timer and delayed work - Process touch in threaded IRQ context - Fix chip reset sequence - Move input_register() before devm_request_threaded_irq() - Re-arrange and document input reporting - Set u16 data type for event_code - Remove double tap event to prevent continuous double side sliding drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/hynitron-cst816x.c | 257 +++++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 drivers/input/touchscreen/hynitron-cst816x.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index c821fe3ee794..02f40d0fbac0 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -481,6 +481,18 @@ config TOUCHSCREEN_HYNITRON_CSTXXX To compile this driver as a module, choose M here: the module will be called hynitron-cstxxx. +config TOUCHSCREEN_HYNITRON_CST816X + tristate "Hynitron CST816X touchscreen support" + depends on I2C + help + Say Y here if you have a touchscreen using a Hynitron + CST816X touchscreen controller. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called hynitron-cst816x. + config TOUCHSCREEN_ILI210X tristate "Ilitek ILI210X based touchscreen" depends on I2C diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index a81cb5aa21a5..a92a87417a97 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_TOUCHSCREEN_GOODIX_BERLIN_CORE) += goodix_berlin_core.o obj-$(CONFIG_TOUCHSCREEN_GOODIX_BERLIN_I2C) += goodix_berlin_i2c.o obj-$(CONFIG_TOUCHSCREEN_GOODIX_BERLIN_SPI) += goodix_berlin_spi.o obj-$(CONFIG_TOUCHSCREEN_HIDEEP) += hideep.o +obj-$(CONFIG_TOUCHSCREEN_HYNITRON_CST816X) += hynitron-cst816x.o obj-$(CONFIG_TOUCHSCREEN_HYNITRON_CSTXXX) += hynitron_cstxxx.o obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o obj-$(CONFIG_TOUCHSCREEN_ILITEK) += ilitek_ts_i2c.o diff --git a/drivers/input/touchscreen/hynitron-cst816x.c b/drivers/input/touchscreen/hynitron-cst816x.c new file mode 100644 index 000000000000..5bb85ec1d60e --- /dev/null +++ b/drivers/input/touchscreen/hynitron-cst816x.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for I2C connected Hynitron CST816X Touchscreen + * + * Copyright (C) 2024 Oleh Kuzhylnyi + */ +#include +#include +#include +#include +#include +#include +#include + +enum cst816x_registers { + CST816X_FRAME = 0x01, + CST816X_MOTION = 0xEC, +}; + +enum cst816x_gestures { + CST816X_SWIPE_UP = 0x01, + CST816X_SWIPE_DOWN = 0x02, + CST816X_SWIPE_LEFT = 0x03, + CST816X_SWIPE_RIGHT = 0x04, + CST816X_SINGLE_TAP = 0x05, + CST816X_LONG_PRESS = 0x0C, +}; + +struct cst816x_touch_info { + u8 gesture; + u8 touch; + u8 abs_x; + u8 abs_y; +} __packed; + +struct cst816x_priv { + struct device *dev; + struct i2c_client *client; + struct gpio_desc *reset; + struct input_dev *input; + struct cst816x_touch_info info; + + u8 rxtx[8]; +}; + +struct cst816x_event_mapping { + enum cst816x_gestures gesture; + u16 event_code; +}; + +static const struct cst816x_event_mapping cst816x_event_map[] = { + {CST816X_SWIPE_UP, BTN_FORWARD}, + {CST816X_SWIPE_DOWN, BTN_BACK}, + {CST816X_SWIPE_LEFT, BTN_LEFT}, + {CST816X_SWIPE_RIGHT, BTN_RIGHT}, + {CST816X_SINGLE_TAP, BTN_TOUCH}, + {CST816X_LONG_PRESS, BTN_TOOL_TRIPLETAP} +}; + +static int cst816x_i2c_read_register(struct cst816x_priv *priv, u8 reg) +{ + struct i2c_client *client; + struct i2c_msg xfer[2]; + int rc; + + client = priv->client; + + xfer[0].addr = client->addr; + xfer[0].flags = 0; + xfer[0].len = sizeof(reg); + xfer[0].buf = ® + + xfer[1].addr = client->addr; + xfer[1].flags = I2C_M_RD; + xfer[1].len = sizeof(priv->rxtx); + xfer[1].buf = priv->rxtx; + + rc = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer)); + if (rc != ARRAY_SIZE(xfer)) { + if (rc >= 0) + rc = -EIO; + } else { + rc = 0; + } + + if (rc < 0) + dev_err(&client->dev, "i2c rx err: %d\n", rc); + + return rc; +} + +static int cst816x_process_touch(struct cst816x_priv *priv) +{ + u8 *raw; + int rc; + + rc = cst816x_i2c_read_register(priv, CST816X_FRAME); + if (!rc) { + raw = priv->rxtx; + + priv->info.gesture = raw[0]; + priv->info.touch = raw[1]; + priv->info.abs_x = ((raw[2] & 0x0F) << 8) | raw[3]; + priv->info.abs_y = ((raw[4] & 0x0F) << 8) | raw[5]; + + dev_dbg(priv->dev, "x: %d, y: %d, t: %d, g: 0x%x\n", + priv->info.abs_x, priv->info.abs_y, priv->info.touch, + priv->info.gesture); + } + + return rc; +} + +static int cst816x_register_input(struct cst816x_priv *priv) +{ + priv->input = devm_input_allocate_device(priv->dev); + if (!priv->input) + return -ENOMEM; + + priv->input->name = "Hynitron CST816X Touchscreen"; + priv->input->phys = "input/ts"; + priv->input->id.bustype = BUS_I2C; + input_set_drvdata(priv->input, priv); + + for (unsigned int i = 0; i < ARRAY_SIZE(cst816x_event_map); i++) { + input_set_capability(priv->input, EV_KEY, + cst816x_event_map[i].event_code); + } + + input_set_abs_params(priv->input, ABS_X, 0, 240, 0, 0); + input_set_abs_params(priv->input, ABS_Y, 0, 240, 0, 0); + + return input_register_device(priv->input); +} + +static void cst816x_reset(struct cst816x_priv *priv) +{ + gpiod_set_value_cansleep(priv->reset, 1); + msleep(50); + gpiod_set_value_cansleep(priv->reset, 0); + msleep(100); +} + +static void report_gesture_event(const struct cst816x_priv *priv, + enum cst816x_gestures gesture, bool touch) +{ + for (unsigned int i = 0; i < ARRAY_SIZE(cst816x_event_map); i++) { + if (cst816x_event_map[i].gesture == gesture) { + input_report_key(priv->input, + cst816x_event_map[i].event_code, + touch); + break; + } + } + + if (!touch) + input_report_key(priv->input, BTN_TOUCH, 0); +} + +/* + * Supports five gestures: TOUCH, LEFT, RIGHT, FORWARD, BACK, and LONG_PRESS. + * Reports surface interaction, sliding coordinates and finger detachment. + * + * 1. TOUCH Gesture Scenario: + * + * [x/y] [touch] [gesture] [Action] [Report ABS] [Report Key] + * x y true 0x00 Touch ABS_X_Y BTN_TOUCH + * x y true 0x00 Slide ABS_X_Y + * x y false 0x05 Gesture BTN_TOUCH + * + * 2. LEFT, RIGHT, FORWARD, BACK, and LONG_PRESS Gestures Scenario: + * + * [x/y] [touch] [gesture] [Action] [Report ABS] [Report Key] + * x y true 0x00 Touch ABS_X_Y BTN_TOUCH + * x y true 0x01 Gesture ABS_X_Y BTN_FORWARD + * x y true 0x01 Slide ABS_X_Y + * x y false 0x01 Detach BTN_FORWARD | BTN_TOUCH + */ +static irqreturn_t cst816x_irq_cb(int irq, void *cookie) +{ + struct cst816x_priv *priv = (struct cst816x_priv *)cookie; + + if (!cst816x_process_touch(priv)) { + if (priv->info.touch) { + input_report_abs(priv->input, ABS_X, priv->info.abs_x); + input_report_abs(priv->input, ABS_Y, priv->info.abs_y); + input_report_key(priv->input, BTN_TOUCH, 1); + } + + if (priv->info.gesture) + report_gesture_event(priv, priv->info.gesture, + priv->info.touch); + + input_sync(priv->input); + } + + return IRQ_HANDLED; +} + +static int cst816x_probe(struct i2c_client *client) +{ + struct cst816x_priv *priv; + struct device *dev = &client->dev; + int rc; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->client = client; + + priv->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(priv->reset)) + return dev_err_probe(dev, PTR_ERR(priv->reset), + "reset gpio not found\n"); + + cst816x_reset(priv); + + rc = cst816x_register_input(priv); + if (rc) + return dev_err_probe(dev, rc, "input register failed\n"); + + rc = devm_request_threaded_irq(dev, client->irq, NULL, cst816x_irq_cb, + IRQF_ONESHOT, dev->driver->name, priv); + if (rc) + return dev_err_probe(dev, rc, "irq request failed\n"); + + return 0; +} + +static const struct i2c_device_id cst816x_id[] = { + { .name = "cst816s", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, cst816x_id); + +static const struct of_device_id cst816x_of_match[] = { + { .compatible = "hynitron,cst816s", }, + { } +}; +MODULE_DEVICE_TABLE(of, cst816x_of_match); + +static struct i2c_driver cst816x_driver = { + .driver = { + .name = "cst816x", + .of_match_table = cst816x_of_match, + }, + .id_table = cst816x_id, + .probe = cst816x_probe, +}; + +module_i2c_driver(cst816x_driver); + +MODULE_AUTHOR("Oleh Kuzhylnyi "); +MODULE_DESCRIPTION("Hynitron CST816X Touchscreen Driver"); +MODULE_LICENSE("GPL");