From patchwork Sun Sep 8 11:30:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleh Kuzhylnyi X-Patchwork-Id: 13795408 Received: from mail-lf1-f49.google.com (mail-lf1-f49.google.com [209.85.167.49]) (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 93BBD26AC2; Sun, 8 Sep 2024 11:30:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725795037; cv=none; b=YxCCCOt8YfXb4Tpw2K/c2gx0yLw0jOb+6Tw8Ox14wDb/6O+E0CpFOCT+l+zE34Qd5WCkgYXD04pByY0Zqf+i94aYjHnk5onbpA7qIPFSSzwkvZFw3wV0V0xUG7GXxyptHk4ArUrAFl/PdXMtr8T389VENwtzHpsmbXpY+rBclUw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725795037; c=relaxed/simple; bh=wvVYxazph3kD3oSNk3/SN/aqPbf7pfU6af5fWK8kxNo=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=so30MFC6XZYzRL/gbGndl2/QRAAB8aZmsg5l7MBXtjHxlRqMR7QTu7MdYjPFb2A35WZsjq2NsqDz3C5Cf8eSZmOVVJPN/mTVjXPqPXH1rWywfaR5QzcGUyquKHjNfGP4gZzHY3vXwd+LnHR0n3OByTU1ng7kQ9fFFUmBI6YP7BQ= 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=AXP/sj6m; arc=none smtp.client-ip=209.85.167.49 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="AXP/sj6m" Received: by mail-lf1-f49.google.com with SMTP id 2adb3069b0e04-5365928acd0so2409274e87.2; Sun, 08 Sep 2024 04:30:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1725795034; x=1726399834; 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=6aBmTg89WmUNqPCbMScwvT8EAdQvqGkgyn43obvAbQM=; b=AXP/sj6mXWFYrELE7tqdY2WNkDfFl/USydpZ5QMpzy+8f0KHR+e6HaCwLlrhb8GW5e 7NX2uVejfCgp9HZ0hrnPqvcW0LMqVO2lUDb8LukiYsQaUfrjrEaeBYlvKVsmIEuJnvX3 fqeaPSgj5HHKc2BO6ZSFvaZIlnsVclU/GfrITYJOK1f9oPVMNDklmBxBxuEnSm3y7N7H YTSG+GMhgtErLcX0cvudpinEN+6OOUHm1Kn2uRzzf/vVeiw2DtVAqPkT5IaIVTnFy5dN T6UxDk8EdAMgRNPrjg00d3Z7DOOTrLQY4CJn2txe+HmAimRWn+A/W9g5VFymwYroZG64 jOpA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725795034; x=1726399834; 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=6aBmTg89WmUNqPCbMScwvT8EAdQvqGkgyn43obvAbQM=; b=P6H3pu6QRQGrrBM/CvcV7JI77kptT+qdDlsZNmF4CSMhh6dliMOct3SB0G9z2uxPko Dw/ISIC895VJTqe95ly2zAkwPz0S/nZ//0Yu5e+jT4ozx/O1SqciDHMJbLfk/7/uhaYi P1bk4BwcdWccEhGtgrUiR9WJfEo+EieJj/LO3BseJlVI72/oigmSdpoeVlHEYdQJ0x83 /9umFTTz6PNBBp6IqzpcsAtO+2B5dWlB8gZeIoPAUvwBZnwyLID48/h/H7C/6dSDe7gs x+mGi/SJlAmwv/7nhugYAfv1PtgtLidzAupdIYyBHRt5zwQqQsfKNXelSRvnPCXyLNw8 MfRQ== X-Forwarded-Encrypted: i=1; AJvYcCUb1Rx+Lz0+1UFdBd5OwioK+vkoswLj3d8xVCDb/yMc74jFmm5attMHQY1H5OJNlGemylfH+w+FK/ls@vger.kernel.org, AJvYcCVK9Vx87PGBReQoVOg6deDAvtCZZYx3GN0glzuiv71hOcFxctCXdNEMcxqvCYdCl6R45+3Hsg2WT33UQdg=@vger.kernel.org, AJvYcCXQ3O2ZQkc797PvVb8IVL7vqZvUDk20bl1gYbZcmjejhUwS9T8rdJRtnlchGcS9fnfWOkIZ2xIC1p7jg05h@vger.kernel.org X-Gm-Message-State: AOJu0YzzZpH0e1wqe04AS9aqAKGHl4XzIGRZsM+UWB9xj/pfkRYtKrJZ mq4vhY+fowF2mR9cJ7ETnAl0Wx6wJURogQJWhkvbz8yzbbFZIXLy X-Google-Smtp-Source: AGHT+IF2iS2/BT9a6Rk3/5ETDArfof1wB8EEXOaMp301Komw2p59vxwDB0N6VeGzt7ltggDrcSjOsw== X-Received: by 2002:a05:6512:1092:b0:533:e4d:3374 with SMTP id 2adb3069b0e04-53658813b0emr4830836e87.57.1725795032748; Sun, 08 Sep 2024 04:30:32 -0700 (PDT) Received: from kuzhyl-vm.. (89-64-30-233.dynamic.chello.pl. [89.64.30.233]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5365f903fccsm386929e87.235.2024.09.08.04.30.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Sep 2024 04:30:32 -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 v5 1/2] dt-bindings: input: touchscreen: add Hynitron CST816X Date: Sun, 8 Sep 2024 13:30:26 +0200 Message-Id: <20240908113027.69471-1-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 --- .../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>; + }; + }; + +... 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[89.64.30.233]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5365f903fccsm386929e87.235.2024.09.08.04.30.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Sep 2024 04:30:44 -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 v5 2/2] input: add driver for Hynitron CST816X touchscreen Date: Sun, 8 Sep 2024 13:30:27 +0200 Message-Id: <20240908113027.69471-2-kuzhylol@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240908113027.69471-1-kuzhylol@gmail.com> References: <20240908113027.69471-1-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 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");