From patchwork Mon Feb 25 16:32:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Weiss X-Patchwork-Id: 10828915 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 180531575 for ; Mon, 25 Feb 2019 16:46:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 075EC29014 for ; Mon, 25 Feb 2019 16:46:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EFD292B811; Mon, 25 Feb 2019 16:46:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2CB3929014 for ; Mon, 25 Feb 2019 16:46:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728428AbfBYQq3 (ORCPT ); Mon, 25 Feb 2019 11:46:29 -0500 Received: from mail.z3ntu.xyz ([128.199.32.197]:38376 "EHLO mail.z3ntu.xyz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728076AbfBYQq3 (ORCPT ); Mon, 25 Feb 2019 11:46:29 -0500 X-Greylist: delayed 544 seconds by postgrey-1.27 at vger.kernel.org; Mon, 25 Feb 2019 11:46:27 EST Received: from localhost.localdomain (80-110-115-173.cgn.dynamic.surfer.at [80.110.115.173]) by mail.z3ntu.xyz (Postfix) with ESMTPSA id F33BEC25CF; Mon, 25 Feb 2019 16:37:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=z3ntu.xyz; s=z3ntu; t=1551112642; bh=3GI3QJeJqWNSfxeDPIdqUn2vofd5dovfcCSpWwNcbDs=; h=From:To:Cc:Subject:Date; b=FMXSuAGGQ75lMcrnP96FxweU5/I55s9UuNFXWWQz/8EppzNGeAaxapzUYGQXg7ekL GcesDB/7c3i7wgTquep6o0hGISmpJbmjmUu1i+SUf6+My7k4uhlg/z7DtxOl/Uc0t/ d0Tg1V7Wccg24ybn/ZdlRhiZD6nxKYR/LTpkYo5U= From: Luca Weiss To: linux-input@vger.kernel.org Cc: Sebastian Reichel , Luca Weiss Subject: [RFC PATCH] Input: add a driver for GPIO controllable vibrators Date: Mon, 25 Feb 2019 17:32:54 +0100 Message-Id: <20190225163252.25176-1-luca@z3ntu.xyz> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Provide a simple driver for GPIO controllable vibrators. It will be used by the Fairphone 2. Signed-off-by: Luca Weiss --- Devicetree binding documentation is not written yet, but the node for the Fairphone 2 is: vibrator { compatible = "gpio-vibrator"; enable-gpios = <&msmgpio 86 GPIO_ACTIVE_HIGH>; vcc-supply = <&pm8941_l18>; }; drivers/input/misc/Kconfig | 12 ++ drivers/input/misc/Makefile | 1 + drivers/input/misc/gpio-vibra.c | 218 ++++++++++++++++++++++++++++++++ 3 files changed, 231 insertions(+) create mode 100644 drivers/input/misc/gpio-vibra.c diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index ca59a2be9bc5..77480268fef2 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -280,6 +280,18 @@ config INPUT_GPIO_DECODER To compile this driver as a module, choose M here: the module will be called gpio_decoder. +config INPUT_GPIO_VIBRA + tristate "GPIO vibrator support" + depends on GPIOLIB || COMPILE_TEST + select INPUT_FF_MEMLESS + help + Say Y here to get support for GPIO based vibrator devices. + + If unsure, say N. + + To compile this driver as a module, choose M here: the module will be + called gpio-vibra. + config INPUT_IXP4XX_BEEPER tristate "IXP4XX Beeper support" depends on ARCH_IXP4XX diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index 9d0f9d1ff68f..79edbad44cf3 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_INPUT_DRV2667_HAPTICS) += drv2667.o obj-$(CONFIG_INPUT_GP2A) += gp2ap002a00f.o obj-$(CONFIG_INPUT_GPIO_BEEPER) += gpio-beeper.o obj-$(CONFIG_INPUT_GPIO_DECODER) += gpio_decoder.o +obj-$(CONFIG_INPUT_GPIO_VIBRA) += gpio-vibra.o obj-$(CONFIG_INPUT_HISI_POWERKEY) += hisi_powerkey.o obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o obj-$(CONFIG_INPUT_IMS_PCU) += ims-pcu.o diff --git a/drivers/input/misc/gpio-vibra.c b/drivers/input/misc/gpio-vibra.c new file mode 100644 index 000000000000..dad18d3f9697 --- /dev/null +++ b/drivers/input/misc/gpio-vibra.c @@ -0,0 +1,218 @@ +/* + * GPIO vibrator driver + * + * Copyright (C) 2019 Luca Weiss + * + * Based on PWM vibrator driver: + * Copyright (C) 2017 Collabora Ltd. + * + * Based on previous work from: + * Copyright (C) 2012 Dmitry Torokhov + * + * Based on PWM beeper driver: + * Copyright (C) 2010, Lars-Peter Clausen + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +enum vibrator_state { + VIBRATOR_OFF, + VIBRATOR_ON +}; + +struct gpio_vibrator { + struct input_dev *input; + struct gpio_desc *gpio; + struct regulator *vcc; + + struct work_struct play_work; + enum vibrator_state state; + bool vcc_on; +}; + +static int gpio_vibrator_start(struct gpio_vibrator *vibrator) +{ + struct device *pdev = vibrator->input->dev.parent; + int err; + + if (!vibrator->vcc_on) { + err = regulator_enable(vibrator->vcc); + if (err) { + dev_err(pdev, "failed to enable regulator: %d", err); + return err; + } + vibrator->vcc_on = true; + } + + gpiod_set_value(vibrator->gpio, 1); + + return 0; +} + +static void gpio_vibrator_stop(struct gpio_vibrator *vibrator) +{ + gpiod_set_value(vibrator->gpio, 0); + + if (vibrator->vcc_on) { + regulator_disable(vibrator->vcc); + vibrator->vcc_on = false; + } +} + +static void gpio_vibrator_play_work(struct work_struct *work) +{ + struct gpio_vibrator *vibrator = container_of(work, + struct gpio_vibrator, play_work); + + if (vibrator->state == VIBRATOR_ON) + gpio_vibrator_start(vibrator); + else + gpio_vibrator_stop(vibrator); +} + +static int gpio_vibrator_play_effect(struct input_dev *dev, void *data, + struct ff_effect *effect) +{ + struct gpio_vibrator *vibrator = input_get_drvdata(dev); + + int level = effect->u.rumble.strong_magnitude; + if (!level) + level = effect->u.rumble.weak_magnitude; + + if (level) { + vibrator->state = VIBRATOR_ON; + } else { + vibrator->state = VIBRATOR_OFF; + } + + schedule_work(&vibrator->play_work); + + return 0; +} + +static void gpio_vibrator_close(struct input_dev *input) +{ + struct gpio_vibrator *vibrator = input_get_drvdata(input); + + cancel_work_sync(&vibrator->play_work); + gpio_vibrator_stop(vibrator); +} + +static int gpio_vibrator_probe(struct platform_device *pdev) +{ + struct gpio_vibrator *vibrator; + int err; + + vibrator = devm_kzalloc(&pdev->dev, sizeof(*vibrator), GFP_KERNEL); + if (!vibrator) + return -ENOMEM; + + vibrator->input = devm_input_allocate_device(&pdev->dev); + if (!vibrator->input) + return -ENOMEM; + + vibrator->vcc = devm_regulator_get(&pdev->dev, "vcc"); + err = PTR_ERR_OR_ZERO(vibrator->vcc); + if (err) { + if (err != -EPROBE_DEFER) + dev_err(&pdev->dev, "Failed to request regulator: %d", + err); + return err; + } + + vibrator->gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW); + err = PTR_ERR_OR_ZERO(vibrator->gpio); + if (err) { + if (err != -EPROBE_DEFER) + dev_err(&pdev->dev, "Failed to request main gpio: %d", + err); + return err; + } + + INIT_WORK(&vibrator->play_work, gpio_vibrator_play_work); + + vibrator->input->name = "gpio-vibrator"; + vibrator->input->id.bustype = BUS_HOST; + vibrator->input->dev.parent = &pdev->dev; + vibrator->input->close = gpio_vibrator_close; + + input_set_drvdata(vibrator->input, vibrator); + input_set_capability(vibrator->input, EV_FF, FF_RUMBLE); + + err = input_ff_create_memless(vibrator->input, NULL, + gpio_vibrator_play_effect); + if (err) { + dev_err(&pdev->dev, "Couldn't create FF dev: %d", err); + return err; + } + + err = input_register_device(vibrator->input); + if (err) { + dev_err(&pdev->dev, "Couldn't register input dev: %d", err); + return err; + } + + platform_set_drvdata(pdev, vibrator); + + return 0; +} + +static int __maybe_unused gpio_vibrator_suspend(struct device *dev) +{ + struct gpio_vibrator *vibrator = dev_get_drvdata(dev); + + cancel_work_sync(&vibrator->play_work); + if (vibrator->state == VIBRATOR_ON) + gpio_vibrator_stop(vibrator); + + return 0; +} + +static int __maybe_unused gpio_vibrator_resume(struct device *dev) +{ + struct gpio_vibrator *vibrator = dev_get_drvdata(dev); + + if (vibrator->state == VIBRATOR_ON) + gpio_vibrator_start(vibrator); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(gpio_vibrator_pm_ops, + gpio_vibrator_suspend, gpio_vibrator_resume); + +#ifdef CONFIG_OF +static const struct of_device_id gpio_vibra_dt_match_table[] = { + { .compatible = "gpio-vibrator" }, + {}, +}; +MODULE_DEVICE_TABLE(of, gpio_vibra_dt_match_table); +#endif + +static struct platform_driver gpio_vibrator_driver = { + .probe = gpio_vibrator_probe, + .driver = { + .name = "gpio-vibrator", + .pm = &gpio_vibrator_pm_ops, + .of_match_table = of_match_ptr(gpio_vibra_dt_match_table), + }, +}; +module_platform_driver(gpio_vibrator_driver); + +MODULE_AUTHOR("Luca Weiss "); +MODULE_DESCRIPTION("GPIO vibrator driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:gpio-vibrator");