From patchwork Wed Feb 10 17:33:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Knecht X-Patchwork-Id: 12081437 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 ED9A8C433E6 for ; Wed, 10 Feb 2021 17:38:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C807A64ED7 for ; Wed, 10 Feb 2021 17:38:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232500AbhBJRhT (ORCPT ); Wed, 10 Feb 2021 12:37:19 -0500 Received: from msg-1.mailo.com ([213.182.54.11]:35640 "EHLO msg-1.mailo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232975AbhBJRft (ORCPT ); Wed, 10 Feb 2021 12:35:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mailoo.org; s=mailo; t=1612978468; bh=hwwNb5pHGySLsYtfoSI6tWuUZtlnwEsyOk44vuG5Y8o=; h=X-EA-Auth:From:To:Cc:Subject:Date:Message-Id:X-Mailer:In-Reply-To: References:MIME-Version:Content-Transfer-Encoding; b=Kw6yKzWjeIb/ggkmosQ1KEWppJJ4nyvufK5JQwAoPO32P03rs+b1WEATX1pX34exR AUDjn2DgivdT6MAp3g48Dg24H0i1rSUTndQ4B1jojE4bP8R8C+9mqkoJJU9TpCvMWE LJXatAJSzCkz8my67x4dQ1Te6VK14Oj7vyoFTMp0= Received: by b-4.in.mailobj.net [192.168.90.14] with ESMTP via proxy.mailoo.org [213.182.55.207] Wed, 10 Feb 2021 18:34:27 +0100 (CET) X-EA-Auth: Vhf3gTQNdNTvxCY3jW16AxHk3RXqxLQWWaTHN6IYTBXnK1DvTBm0aNoWi8RXlDmK4EIf5bkHvgD43k1OBqgRdvhpoWHpo6rtF9XNEyn66Hk= From: Vincent Knecht To: Dmitry Torokhov , Rob Herring , Henrik Rydberg , Vincent Knecht , Linus Walleij , Michael Srba , linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: ~postmarketos/upstreaming@lists.sr.ht Subject: [PATCH v4 2/2] Input: add MStar MSG2638 touchscreen driver Date: Wed, 10 Feb 2021 18:33:52 +0100 Message-Id: <20210210173403.667482-2-vincent.knecht@mailoo.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210210173403.667482-1-vincent.knecht@mailoo.org> References: <20210210173403.667482-1-vincent.knecht@mailoo.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Add support for the msg2638 touchscreen IC from MStar. This driver reuses zinitix.c structure, while the checksum and irq handler functions are based on out-of-tree driver for Alcatel Idol 3 (4.7"). Signed-off-by: Vincent Knecht --- Changed in v4: - rename from msg26xx to msg2638, following compatible string change - rename mstar_* functions to msg2638_* for consistency - add RESET_DELAY define and use it in msg2638_power_on() - change a few dev_err() calls to be on one line only - add missing \n in a few dev_err() strings Changed in v3: - no change Changed in v2: - don't use bitfields in packet struct, to prevent endian-ness related problems (Dmitry) - fix reset gpiod calls order in mstar_power_on() (Dmitry) --- drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/msg2638.c | 362 ++++++++++++++++++++++++++++ 3 files changed, 375 insertions(+) create mode 100644 drivers/input/touchscreen/msg2638.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index f012fe746df0..fefbe1c1bb10 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -1334,4 +1334,16 @@ config TOUCHSCREEN_ZINITIX To compile this driver as a module, choose M here: the module will be called zinitix. +config TOUCHSCREEN_MSG2638 + tristate "MStar msg2638 touchscreen support" + depends on I2C + depends on GPIOLIB || COMPILE_TEST + help + Say Y here if you have an I2C touchscreen using MStar msg2638. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called msg2638. + endif diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 6233541e9173..83e516cb3d33 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -112,3 +112,4 @@ obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o obj-$(CONFIG_TOUCHSCREEN_RASPBERRYPI_FW) += raspberrypi-ts.o obj-$(CONFIG_TOUCHSCREEN_IQS5XX) += iqs5xx.o obj-$(CONFIG_TOUCHSCREEN_ZINITIX) += zinitix.o +obj-$(CONFIG_TOUCHSCREEN_MSG2638) += msg2638.o diff --git a/drivers/input/touchscreen/msg2638.c b/drivers/input/touchscreen/msg2638.c new file mode 100644 index 000000000000..e00cff923fe2 --- /dev/null +++ b/drivers/input/touchscreen/msg2638.c @@ -0,0 +1,362 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for MStar msg2638 touchscreens + * + * Copyright (c) 2021 Vincent Knecht + * + * Checksum and IRQ handler based on mstar_drv_common.c and mstar_drv_mutual_fw_control.c + * Copyright (c) 2006-2012 MStar Semiconductor, Inc. + * + * Driver structure based on zinitix.c by Michael Srba + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MODE_DATA_RAW 0x5A + +#define TPD_WIDTH 2048 +#define TPD_HEIGHT 2048 + +#define MAX_SUPPORTED_FINGER_NUM 5 + +#define CHIP_ON_DELAY 15 // ms +#define FIRMWARE_ON_DELAY 50 // ms +#define RESET_DELAY 10 // ms + +struct point_coord { + u16 x; + u16 y; +}; + +struct packet { + u8 xy_hi; /* higher bits of x and y coordinates */ + u8 x_low; + u8 y_low; + u8 pressure; +}; + +struct touch_event { + u8 mode; + struct packet pkt[MAX_SUPPORTED_FINGER_NUM]; + u8 proximity; + u8 checksum; +}; + +struct msg2638_ts_data { + struct i2c_client *client; + struct input_dev *input_dev; + struct touchscreen_properties prop; + struct regulator_bulk_data supplies[2]; + struct gpio_desc *reset_gpiod; +}; + +static int msg2638_init_regulators(struct msg2638_ts_data *msg2638) +{ + struct i2c_client *client = msg2638->client; + int error; + + msg2638->supplies[0].supply = "vdd"; + msg2638->supplies[1].supply = "vddio"; + error = devm_regulator_bulk_get(&client->dev, + ARRAY_SIZE(msg2638->supplies), + msg2638->supplies); + if (error < 0) { + dev_err(&client->dev, "Failed to get regulators: %d\n", error); + return error; + } + + return 0; +} + +static void msg2638_power_on(struct msg2638_ts_data *msg2638) +{ + gpiod_set_value(msg2638->reset_gpiod, 1); + mdelay(RESET_DELAY); + gpiod_set_value(msg2638->reset_gpiod, 0); + mdelay(FIRMWARE_ON_DELAY); + + enable_irq(msg2638->client->irq); +} + +static void msg2638_report_finger(struct msg2638_ts_data *msg2638, int slot, + const struct point_coord *pc) +{ + input_mt_slot(msg2638->input_dev, slot); + input_mt_report_slot_state(msg2638->input_dev, MT_TOOL_FINGER, true); + touchscreen_report_pos(msg2638->input_dev, &msg2638->prop, pc->x, pc->y, true); + input_report_abs(msg2638->input_dev, ABS_MT_TOUCH_MAJOR, 1); +} + +static u8 msg2638_checksum(u8 *data, u32 length) +{ + s32 sum = 0; + u32 i; + + for (i = 0; i < length; i++) + sum += data[i]; + + return (u8)((-sum) & 0xFF); +} + +static irqreturn_t msg2638_ts_irq_handler(int irq, void *msg2638_handler) +{ + struct msg2638_ts_data *msg2638 = msg2638_handler; + struct i2c_client *client = msg2638->client; + struct touch_event touch_event; + struct point_coord coord; + struct i2c_msg msg[1]; + struct packet *p; + u32 len; + int ret; + int i; + + len = sizeof(struct touch_event); + memset(&touch_event, 0, len); + + msg[0].addr = client->addr; + msg[0].flags = I2C_M_RD; + msg[0].len = len; + msg[0].buf = (u8 *)&touch_event; + + ret = i2c_transfer(client->adapter, msg, 1); + if (ret != 1) { + dev_err(&client->dev, "Failed I2C transfer in irq handler!\n"); + goto out; + } + + if (touch_event.mode != MODE_DATA_RAW) + goto out; + + if (msg2638_checksum((u8 *)&touch_event, len - 1) != touch_event.checksum) { + dev_err(&client->dev, "Failed checksum!\n"); + goto out; + } + + for (i = 0; i < MAX_SUPPORTED_FINGER_NUM; i++) { + p = &touch_event.pkt[i]; + /* Ignore non-pressed finger data */ + if (p->xy_hi == 0xFF && p->x_low == 0xFF && p->y_low == 0xFF) + continue; + + coord.x = (((p->xy_hi & 0xF0) << 4) | p->x_low) * msg2638->prop.max_x / TPD_WIDTH; + coord.y = (((p->xy_hi & 0x0F) << 8) | p->y_low) * msg2638->prop.max_y / TPD_HEIGHT; + msg2638_report_finger(msg2638, i, &coord); + } + + input_mt_sync_frame(msg2638->input_dev); + input_sync(msg2638->input_dev); + +out: + return IRQ_HANDLED; +} + +static int msg2638_start(struct msg2638_ts_data *msg2638) +{ + int error; + + error = regulator_bulk_enable(ARRAY_SIZE(msg2638->supplies), + msg2638->supplies); + if (error) { + dev_err(&msg2638->client->dev, "Failed to enable regulators: %d\n", error); + return error; + } + + msleep(CHIP_ON_DELAY); + + msg2638_power_on(msg2638); + + return 0; +} + +static int msg2638_stop(struct msg2638_ts_data *msg2638) +{ + int error; + + disable_irq(msg2638->client->irq); + + error = regulator_bulk_disable(ARRAY_SIZE(msg2638->supplies), + msg2638->supplies); + if (error) { + dev_err(&msg2638->client->dev, "Failed to disable regulators: %d\n", error); + return error; + } + + return 0; +} + +static int msg2638_input_open(struct input_dev *dev) +{ + struct msg2638_ts_data *msg2638 = input_get_drvdata(dev); + + return msg2638_start(msg2638); +} + +static void msg2638_input_close(struct input_dev *dev) +{ + struct msg2638_ts_data *msg2638 = input_get_drvdata(dev); + + msg2638_stop(msg2638); +} + +static int msg2638_init_input_dev(struct msg2638_ts_data *msg2638) +{ + struct input_dev *input_dev; + int error; + + input_dev = devm_input_allocate_device(&msg2638->client->dev); + if (!input_dev) { + dev_err(&msg2638->client->dev, "Failed to allocate input device.\n"); + return -ENOMEM; + } + + input_set_drvdata(input_dev, msg2638); + msg2638->input_dev = input_dev; + + input_dev->name = "MStar TouchScreen"; + input_dev->phys = "input/ts"; + input_dev->id.bustype = BUS_I2C; + input_dev->open = msg2638_input_open; + input_dev->close = msg2638_input_close; + + input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X); + input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y); + input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, 15, 0, 0); + input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); + + touchscreen_parse_properties(input_dev, true, &msg2638->prop); + if (!msg2638->prop.max_x || !msg2638->prop.max_y) { + dev_err(&msg2638->client->dev, + "touchscreen-size-x and/or touchscreen-size-y not set in dts\n"); + return -EINVAL; + } + + error = input_mt_init_slots(input_dev, MAX_SUPPORTED_FINGER_NUM, + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); + if (error) { + dev_err(&msg2638->client->dev, "Failed to initialize MT slots: %d\n", error); + return error; + } + + error = input_register_device(input_dev); + if (error) { + dev_err(&msg2638->client->dev, "Failed to register input device: %d\n", error); + return error; + } + + return 0; +} + +static int msg2638_ts_probe(struct i2c_client *client) +{ + struct msg2638_ts_data *msg2638; + int error; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(&client->dev, "Failed to assert adapter's support for plain I2C.\n"); + return -ENXIO; + } + + msg2638 = devm_kzalloc(&client->dev, sizeof(*msg2638), GFP_KERNEL); + if (!msg2638) + return -ENOMEM; + + msg2638->client = client; + i2c_set_clientdata(client, msg2638); + + error = msg2638_init_regulators(msg2638); + if (error) { + dev_err(&client->dev, "Failed to initialize regulators: %d\n", error); + return error; + } + + msg2638->reset_gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(msg2638->reset_gpiod)) { + error = PTR_ERR(msg2638->reset_gpiod); + dev_err(&client->dev, "Failed to request reset GPIO: %d\n", error); + return error; + } + + error = msg2638_init_input_dev(msg2638); + if (error) { + dev_err(&client->dev, "Failed to initialize input device: %d\n", error); + return error; + } + + irq_set_status_flags(client->irq, IRQ_NOAUTOEN); + error = devm_request_threaded_irq(&client->dev, client->irq, + NULL, msg2638_ts_irq_handler, + IRQF_ONESHOT, client->name, msg2638); + if (error) { + dev_err(&client->dev, "Failed to request IRQ: %d\n", error); + return error; + } + + return 0; +} + +static int __maybe_unused msg2638_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct msg2638_ts_data *msg2638 = i2c_get_clientdata(client); + + mutex_lock(&msg2638->input_dev->mutex); + + if (input_device_enabled(msg2638->input_dev)) + msg2638_stop(msg2638); + + mutex_unlock(&msg2638->input_dev->mutex); + + return 0; +} + +static int __maybe_unused msg2638_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct msg2638_ts_data *msg2638 = i2c_get_clientdata(client); + int ret = 0; + + mutex_lock(&msg2638->input_dev->mutex); + + if (input_device_enabled(msg2638->input_dev)) + ret = msg2638_start(msg2638); + + mutex_unlock(&msg2638->input_dev->mutex); + + return ret; +} + +static SIMPLE_DEV_PM_OPS(msg2638_pm_ops, msg2638_suspend, msg2638_resume); + +#ifdef CONFIG_OF +static const struct of_device_id msg2638_of_match[] = { + { .compatible = "mstar,msg2638" }, + { } +}; +MODULE_DEVICE_TABLE(of, msg2638_of_match); +#endif + +static struct i2c_driver msg2638_ts_driver = { + .probe_new = msg2638_ts_probe, + .driver = { + .name = "MStar-TS", + .pm = &msg2638_pm_ops, + .of_match_table = of_match_ptr(msg2638_of_match), + }, +}; +module_i2c_driver(msg2638_ts_driver); + +MODULE_AUTHOR("Vincent Knecht "); +MODULE_DESCRIPTION("MStar MSG2638 touchscreen driver"); +MODULE_LICENSE("GPL v2");