From patchwork Tue Sep 10 11:51:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleh Kuzhylnyi X-Patchwork-Id: 13798375 Received: from mail-lf1-f48.google.com (mail-lf1-f48.google.com [209.85.167.48]) (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 1ECDF18785A; Tue, 10 Sep 2024 11:52:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725969126; cv=none; b=lextbXlMF2hBhCdCutg3yNhNLaW3T6xabhnnXKx9JWVdGtos+FiMQtS7331EnYy77m/5TYBoxuPDWA0T8udV4W+/tuo6hbSi3bwEnAFB5fV0QWD9QW4YeA2IaoXpRaXSb5zUUd5Kzyz7/QSFjGYUCDLnt4eZ2kDrLmvIZYRnj28= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725969126; c=relaxed/simple; bh=Ozkhhtc8keO96JP7DbB7pUh7uyTgImZ7a5BI3N6+Kn0=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=WyHg6/Q840Twoli/MUlHNvBTFJt4ixRHfS+1ngw1ueK9ongnNDCky7xuomW0RLSgtwl/+gny4Ooyzu5G8mm1Lnwqat3snlX8pfaMnC5jVzwEnuYKhKnHI4K+1F6ZbN1QANjQOz6J9Wv8BRTiALQOgUL3e+Id+20+rizNt6Bqhwo= 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=kSkD9rEr; arc=none smtp.client-ip=209.85.167.48 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="kSkD9rEr" Received: by mail-lf1-f48.google.com with SMTP id 2adb3069b0e04-53660856a21so3066428e87.2; Tue, 10 Sep 2024 04:52:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1725969123; x=1726573923; 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=LpQEnTJoJcWVLzjCPdzJAjUs5rW4bpr1g7ypfKTBLoo=; b=kSkD9rErgt9a+zzYnqEeqGuzeEJfxswMcYYW6Mzfn/uwGa+KuIJyngBLjCZ7WgQIJf c+oUMTjn1Ypk5zy5QszRY9sJKwsIYLEL7p+WqSXPV4gqt3gAyfAeFA9zQ77JNAaX+V68 ptIO7kP9XqURPCgb+p9Fn3T/+Vt8ndbHcoo3jFDcdtCkhhclVeelBtB9yBc8S84oH6r7 N68AeUL4K8gxW5d3Wkz2Fwlzkt2sf2e9yc5paw2tWMks90S4oh9y2otd4Xl4CSRz2lR1 tbTeonQxbhRCJpG20MUtlf2OqeCVxtQU3vehPbxHPkA0uC1RdSzDxQhh1Q/b6N8XRO0t ohEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725969123; x=1726573923; 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=LpQEnTJoJcWVLzjCPdzJAjUs5rW4bpr1g7ypfKTBLoo=; b=C9YFigQHwERypBIU3oD+XXHT1vYgyRhE0e0KHv4fK5IZAv7NjY2vHCZ0XnMxNedV+g X+b0X8gvI6GY4viv8XkK8vXtwJzGgZOKcecTSBWr/BBtSFRppAB1OtnS9FSwjAvZODC7 sImHqvB9DlJNkSMfWJ4yGkGGfznL/0vu57dfxxCYvbZR8wkYJ/qaOcu3YCJR3Pq4IKY/ ftr7S98HDMsx8N4GTcb+mUy71rbfr9rJbcaJa5KqAlU/28+KeL9Wjdz0FlB/IslpL2+W 3fKKaa2sdRuSUuvFqctWcZphJ79widXRhZINVmrrsZwlLNT5vKzRmkX+FLFyd2DzEmD6 wA9Q== X-Forwarded-Encrypted: i=1; AJvYcCUvsZLFGc5/JgFtZy5gboKEeGLF8inbh26MsIL0NzBkU2qAjQj8kACD9qrYLKTBVa8GWXHFhlSfJ1H0DgI=@vger.kernel.org, AJvYcCWBLLe1BR10+fse7C87B6U162bCYVSePoSyW1y9E+/qXVchx7b4l7XZCjdMVV195qymhNDIsuFjj2CAAcbH@vger.kernel.org, AJvYcCX7xSr/fY7rVDFf6QunUum7E2LY2HjIaaaKXLbHnkgd2t7dyRtP1VihHjdSznVxCuANq+8JEBkC5uT2@vger.kernel.org X-Gm-Message-State: AOJu0YzkNzGNItgjh7EtD14cEEDhJi4Gb21k1bDngGN0tlTushRiz92j v2YZcTAqrVBipEgmWPPH6h8K2DvLa3EDAVnrlHiYgn2dm56osYVR X-Google-Smtp-Source: AGHT+IFwAFUn6MaKR7D6IPTnhn7JnewOyJSQx1gyoVnko+GDPSIJecIocLm5GGSHw9n/DvbBScxBVg== X-Received: by 2002:a05:6512:124b:b0:52e:941d:7039 with SMTP id 2adb3069b0e04-5365881a437mr10068689e87.59.1725969122100; Tue, 10 Sep 2024 04:52:02 -0700 (PDT) Received: from kuzhyl-vm.. (89-64-30-233.dynamic.chello.pl. [89.64.30.233]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5365f870ce0sm1122963e87.116.2024.09.10.04.52.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Sep 2024 04:52:01 -0700 (PDT) From: Oleh Kuzhylnyi To: Dmitry Torokhov Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Oleh Kuzhylnyi , Conor Dooley , igor.opaniuk@gmail.com, Neil Armstrong , Jeff LaBundy Subject: [PATCH v6 1/2] dt-bindings: input: touchscreen: add Hynitron CST816X Date: Tue, 10 Sep 2024 13:51:57 +0200 Message-Id: <20240910115158.74502-1-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. Reviewed-by: Conor Dooley Signed-off-by: Oleh Kuzhylnyi --- Changes in v6: - Fix minor tweak adviced by Krzysztof: - Move additionalProperties field after required Changes in v5: - No code changes Changes in v4: - Add Conor's Dooley "Reviewed-by" tag Changes in v3: - Rename filename to hynitron,cst816s.yaml - Update description with display details Changes in v2: - Apply pin definitions and DT headers - Use generic name for DT node - Drop status field .../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..b3f4049e4b9b --- /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 + +required: + - compatible + - reg + - interrupts + - reset-gpios + +additionalProperties: false + +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 Tue Sep 10 11:51:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Oleh Kuzhylnyi X-Patchwork-Id: 13798376 Received: from mail-lf1-f47.google.com (mail-lf1-f47.google.com [209.85.167.47]) (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 59C3E18C932; Tue, 10 Sep 2024 11:52:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725969128; cv=none; b=NGkP1mKtPtGK/oZK2Ichx4x+r5UJUMbSgoIooMcikbeZ4au/F8A9onTal0RMuup8WNPT4USpiCJSmnhBtsxdOuMXPUKS5gPHUtApoBm4xQFOtXgB0jogFS/GO1ECcg1wM+KgG6c8jdug5x7nQHtNeRjT739HLfU1zJxyOJ8AtKU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725969128; c=relaxed/simple; bh=ZpqNG3urr23NEi4OonQDkHHBaoF6QUyS+kFx8zNria4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=uOUvKrZkN9lNF+rmXHEM83pvGU86SYKTVWIS0FE/bFcrERdUl81rVOsdBGoUy91e9PsSkXFmEjzX0VL/in1bZ7stPJzmtp8lgPM7DhsDv079uZjGDEbaJeoZrcp2pvaIUZKiiZGB/p+IhJpF2otpCXZ+OP/e5pfgQysWZ0VYBGA= 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=eb0qxZRC; arc=none smtp.client-ip=209.85.167.47 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="eb0qxZRC" Received: by mail-lf1-f47.google.com with SMTP id 2adb3069b0e04-535dc4ec181so5037701e87.3; Tue, 10 Sep 2024 04:52:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1725969124; x=1726573924; 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=95W4XCkHfmShfwc692ZJMWzRaVk4yLWxlXFSj911AOY=; b=eb0qxZRCVQ0vmaHnrzcZl7g0CRGitAjMPpP+F//e3Q40si2+B2S0uKA0AvHeBE6zvH ioW+EL1D71Bnqkwy7H0yTjqIStfIXXXSDTxiwx4q2+LiWhzALUuH5GTHBATvyhSdl436 J0zflHPGTrSdwuoTuX8qGWc4H+vl4oFhCGwLtPEhI21dWXzB61W5mKBuakEAillDqLdC mKE/GrCG9lZEbRkgTi6YB6uHFZ3i0iDHtHG/OEVmSl1W3UAV/lLV41fFOwYAJfoJeoEj WjsEF9Gu8dYNCvyLqRCxjulZinWttJ2xFEb7RmBOopxCtQEgZ6Zf7f7BduUq5Odu7kQh h8BA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725969124; x=1726573924; 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=95W4XCkHfmShfwc692ZJMWzRaVk4yLWxlXFSj911AOY=; b=AO7ZcHQiYwkoEquOXPAqfmFHGmkX6EGFL2DZ6CEkPw+zSo48rD/aAF1yvly+1GQ5G+ 3Oa2NifDCMEEomzprznLXJbXDFIC78xpwncKE14Rabz/Xtm9gWOnuVKNK91rD0zTNeaF Bc7CM0bIa3qtjn2/0DuoF9ocGVgXHJ9n8BtI2iSS2/jjYqByr3vzpmm7FJFmiCQMpv0+ zZvj0trql1BDqVb7cDx+UAezqwXSnT8r/4diHIiqDBTRqRD+GY679BpDfHe3rbyy21a1 y/YiqJ9hybx6vmqKQ6ZxoMB7K91k1Vjspsz4vH4i945Fg9vWcYnXlI7q94MttPi4g/+t oVWw== X-Forwarded-Encrypted: i=1; AJvYcCUKZCxjHN95UtexJf+yxzNvEYfkEIVM70vL6TDm/zMl+ZX9SiRlgZqIA++2tHrFx10fKtbudm48HuzgXUAp@vger.kernel.org, AJvYcCUfbRVHr0DkMy4PLDs2dfMziNewEltB1rxLPM3GDoFn/vNYU28SixYG8cpmz8RnTIpYlP7GUvmHaLVF@vger.kernel.org, AJvYcCXct911qaETLtYt2AGuqbXr0T7TqeQrA2PIrwiXWP+riTP1HgP4brnhbB8opg5KOgxTgBBmlf7qYLAemKs=@vger.kernel.org X-Gm-Message-State: AOJu0YwXmBZnle/lsAFmmpxCQxhA2HJtCdrUwPY8AxTgVshdlUOtBAJ3 py4pA+/xTgrfJZSsi7n7LBILjSNEfr5m6MFcp8k/5Qw1R7uA/bRK X-Google-Smtp-Source: AGHT+IET1w2zb8wa/Dv5kxxnYAfb7FbTi5pu0cOuW160xg/BNCQjR+F45gQpGfPrWdUzO618hjJtzA== X-Received: by 2002:a05:6512:3ba5:b0:533:4785:82a0 with SMTP id 2adb3069b0e04-536587a42eemr8414694e87.2.1725969124096; Tue, 10 Sep 2024 04:52:04 -0700 (PDT) Received: from kuzhyl-vm.. (89-64-30-233.dynamic.chello.pl. [89.64.30.233]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5365f870ce0sm1122963e87.116.2024.09.10.04.52.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Sep 2024 04:52:03 -0700 (PDT) From: Oleh Kuzhylnyi To: Dmitry Torokhov Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Oleh Kuzhylnyi , Conor Dooley , igor.opaniuk@gmail.com, Neil Armstrong , Jeff LaBundy Subject: [PATCH v6 2/2] input: add driver for Hynitron CST816X touchscreen Date: Tue, 10 Sep 2024 13:51:58 +0200 Message-Id: <20240910115158.74502-2-kuzhylol@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240910115158.74502-1-kuzhylol@gmail.com> References: <20240910115158.74502-1-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 v6: - No code changes Changes in v5: - Update commit based on Dmitry's feedback: - Make GPIO reset optional - Combine declaration and initialization for i2c_xfer - Return 0 explicitly where possible - Rename rc (return code) to error - Make Touch processing call return boolean - Improve error handling for i2c_transfer - Use get_unaligned_be16 for getting coordinates - Move touch event completeness upper to irq callback Changes in v4: - Update commit based on Dmitry's feedback: - Move abs_x and abs_y to u16 - Remove __packed qualifier for touch_info struct - Hide tiny touch irq context to stack - Extend cst816x_i2c_read_register() with buf and buf_size - Remove loop from event lookup 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 Changes in v2: - Apply dev_err_probe() for better error handling - Remove redundant printing, remove dev_warn() message spamming - Get rid of PM since the touchscreen goes into sleep mode automatically - Get rid of IRQ control and IRQF_NO_AUTOEN flag - Reduce timer timeout up to 10ms to handle touch events faster - Skip registering of non-gesture CST816X_SWIPE event - Shift input_register_device() as a final call in probe() callback - Specify name of i2c_device_id explicitly - Update module description and fix typo - Add necessary spaces between lines drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/hynitron-cst816x.c | 259 +++++++++++++++++++ 3 files changed, 272 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..3886617e6a71 --- /dev/null +++ b/drivers/input/touchscreen/hynitron-cst816x.c @@ -0,0 +1,259 @@ +// 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 +#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, + CST816X_RESERVED = 0xFF, +}; + +struct cst816x_touch_info { + u8 gesture; + u8 touch; + u16 abs_x; + u16 abs_y; +}; + +struct cst816x_priv { + struct device *dev; + struct i2c_client *client; + struct gpio_desc *reset; + struct input_dev *input; +}; + +struct cst816x_event_mapping { + enum cst816x_gestures gesture; + u16 code; +}; + +static const struct cst816x_event_mapping event_map[16] = { + {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}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, + {CST816X_RESERVED, KEY_RESERVED}, +}; + +static int cst816x_i2c_read_register(struct cst816x_priv *priv, u8 reg, + void *buf, size_t len) +{ + int rc; + struct i2c_msg xfer[] = { + { + .addr = priv->client->addr, + .flags = 0, + .buf = ®, + .len = sizeof(reg), + }, + { + .addr = priv->client->addr, + .flags = I2C_M_RD, + .buf = buf, + .len = len, + }, + }; + + rc = i2c_transfer(priv->client->adapter, xfer, ARRAY_SIZE(xfer)); + if (rc != ARRAY_SIZE(xfer)) { + rc = rc < 0 ? rc : -EIO; + dev_err(&priv->client->dev, "i2c rx err: %d\n", rc); + return rc; + } + + return 0; +} + +static bool cst816x_process_touch(struct cst816x_priv *priv, + struct cst816x_touch_info *info) +{ + u8 raw[8]; + + if (cst816x_i2c_read_register(priv, CST816X_FRAME, raw, sizeof(raw))) + return false; + + info->gesture = raw[0]; + info->touch = raw[1]; + info->abs_x = get_unaligned_be16(&raw[2]) & GENMASK(11, 0); + info->abs_y = get_unaligned_be16(&raw[4]) & GENMASK(11, 0); + + dev_dbg(priv->dev, "x: %d, y: %d, t: %d, g: 0x%x\n", info->abs_x, + info->abs_y, info->touch, info->gesture); + + return true; +} + +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(event_map); i++) + input_set_capability(priv->input, EV_KEY, event_map[i].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) +{ + if (priv->reset) { + 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) +{ + u16 key = event_map[gesture & 0x0F].code; + + if (key != KEY_RESERVED) + input_report_key(priv->input, key, touch); +} + +/* + * 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 = cookie; + struct cst816x_touch_info info; + + if (!cst816x_process_touch(priv, &info)) + goto out; + + if (info.touch) { + input_report_abs(priv->input, ABS_X, info.abs_x); + input_report_abs(priv->input, ABS_Y, info.abs_y); + input_report_key(priv->input, BTN_TOUCH, 1); + } + + if (info.gesture) { + report_gesture_event(priv, info.gesture, info.touch); + + if (!info.touch) + input_report_key(priv->input, BTN_TOUCH, 0); + } + + input_sync(priv->input); + +out: + return IRQ_HANDLED; +} + +static int cst816x_probe(struct i2c_client *client) +{ + struct cst816x_priv *priv; + struct device *dev = &client->dev; + int error; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->client = client; + + priv->reset = devm_gpiod_get_optional(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); + + error = cst816x_register_input(priv); + if (error) + return dev_err_probe(dev, error, "input register failed\n"); + + error = devm_request_threaded_irq(dev, client->irq, NULL, cst816x_irq_cb, + IRQF_ONESHOT, dev->driver->name, priv); + if (error) + return dev_err_probe(dev, error, "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");