From d64cb71bede87dbca60d586a7bb4cef87fbe2731 Mon Sep 17 00:00:00 2001 From: Jaewon Kim Date: Wed, 17 Dec 2014 10:31:08 -0800 Subject: Input: add regulator haptic driver This change adds support for haptic driver controlled by voltage of a regulator. Userspace can control the device via Force Feedback interface from input framework. Signed-off-by: Jaewon Kim Signed-off-by: Hyunhee Kim Acked-by: Kyungmin Park Tested-by: Chanwoo Choi Reviewed-by: Chanwoo Choi Reviewed-by: Pankaj Dubey Signed-off-by: Dmitry Torokhov --- drivers/input/misc/Kconfig | 12 ++ drivers/input/misc/Makefile | 1 + drivers/input/misc/regulator-haptic.c | 279 ++++++++++++++++++++++++++++++++++ 3 files changed, 292 insertions(+) create mode 100644 drivers/input/misc/regulator-haptic.c (limited to 'drivers/input/misc') diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index 23297ab..1da0a20 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -394,6 +394,18 @@ config INPUT_CM109 To compile this driver as a module, choose M here: the module will be called cm109. +config INPUT_REGULATOR_HAPTIC + tristate "Regulator haptics support" + depends on REGULATOR + select INPUT_FF_MEMLESS + help + This option enables device driver support for the haptic controlled + by a regulator. This driver supports ff-memless interface + from input framework. + + To compile this driver as a module, choose M here: the + module will be called regulator-haptic. + config INPUT_RETU_PWRBUTTON tristate "Retu Power button Driver" depends on MFD_RETU diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index 19c7603..1f135af 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o obj-$(CONFIG_INPUT_POWERMATE) += powermate.o obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o +obj-$(CONFIG_INPUT_REGULATOR_HAPTIC) += regulator-haptic.o obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o diff --git a/drivers/input/misc/regulator-haptic.c b/drivers/input/misc/regulator-haptic.c new file mode 100644 index 0000000..9426221 --- /dev/null +++ b/drivers/input/misc/regulator-haptic.c @@ -0,0 +1,279 @@ +/* + * Regulator haptic driver + * + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * Author: Jaewon Kim + * Author: Hyunhee Kim + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define MAX_MAGNITUDE_SHIFT 16 + +struct regulator_haptic { + struct device *dev; + struct input_dev *input_dev; + struct regulator *regulator; + + struct work_struct work; + struct mutex mutex; + + bool active; + bool suspended; + + unsigned int max_volt; + unsigned int min_volt; + unsigned int magnitude; +}; + +static int regulator_haptic_toggle(struct regulator_haptic *haptic, bool on) +{ + int error; + + if (haptic->active != on) { + + error = on ? regulator_enable(haptic->regulator) : + regulator_disable(haptic->regulator); + if (error) { + dev_err(haptic->dev, + "failed to switch regulator %s: %d\n", + on ? "on" : "off", error); + return error; + } + + haptic->active = on; + } + + return 0; +} + +static int regulator_haptic_set_voltage(struct regulator_haptic *haptic, + unsigned int magnitude) +{ + u64 volt_mag_multi; + unsigned int intensity; + int error; + + volt_mag_multi = (u64)(haptic->max_volt - haptic->min_volt) * magnitude; + intensity = (unsigned int)(volt_mag_multi >> MAX_MAGNITUDE_SHIFT); + + error = regulator_set_voltage(haptic->regulator, + intensity + haptic->min_volt, + haptic->max_volt); + if (error) { + dev_err(haptic->dev, "cannot set regulator voltage to %d: %d\n", + intensity + haptic->min_volt, error); + return error; + } + + return 0; +} + +static void regulator_haptic_work(struct work_struct *work) +{ + struct regulator_haptic *haptic = container_of(work, + struct regulator_haptic, work); + unsigned int magnitude; + int error; + + mutex_lock(&haptic->mutex); + + if (haptic->suspended) + goto out; + + magnitude = ACCESS_ONCE(haptic->magnitude); + + error = regulator_haptic_set_voltage(haptic, magnitude); + if (error) + goto out; + + regulator_haptic_toggle(haptic, magnitude != 0); + +out: + mutex_unlock(&haptic->mutex); +} + +static int regulator_haptic_play_effect(struct input_dev *input, void *data, + struct ff_effect *effect) +{ + struct regulator_haptic *haptic = input_get_drvdata(input); + + haptic->magnitude = effect->u.rumble.strong_magnitude; + if (!haptic->magnitude) + haptic->magnitude = effect->u.rumble.weak_magnitude; + + schedule_work(&haptic->work); + + return 0; +} + +static void regulator_haptic_close(struct input_dev *input) +{ + struct regulator_haptic *haptic = input_get_drvdata(input); + + cancel_work_sync(&haptic->work); + regulator_haptic_set_voltage(haptic, 0); + regulator_haptic_toggle(haptic, false); +} + +static int __maybe_unused +regulator_haptic_parse_dt(struct device *dev, struct regulator_haptic *haptic) +{ + struct device_node *node; + int error; + + node = dev->of_node; + if(!node) { + dev_err(dev, "Missing dveice tree data\n"); + return -EINVAL; + } + + error = of_property_read_u32(node, "max-microvolt", &haptic->max_volt); + if (error) { + dev_err(dev, "cannot parse max-microvolt\n"); + return error; + } + + error = of_property_read_u32(node, "min-microvolt", &haptic->min_volt); + if (error) { + dev_err(dev, "cannot parse min-microvolt\n"); + return error; + } + + return 0; +} + +static int regulator_haptic_probe(struct platform_device *pdev) +{ + const struct regulator_haptic_data *pdata = dev_get_platdata(&pdev->dev); + struct regulator_haptic *haptic; + struct input_dev *input_dev; + int error; + + haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL); + if (!haptic) + return -ENOMEM; + + platform_set_drvdata(pdev, haptic); + haptic->dev = &pdev->dev; + mutex_init(&haptic->mutex); + INIT_WORK(&haptic->work, regulator_haptic_work); + + if (pdata) { + haptic->max_volt = pdata->max_volt; + haptic->min_volt = pdata->min_volt; + } else if (IS_ENABLED(CONFIG_OF)) { + error = regulator_haptic_parse_dt(&pdev->dev, haptic); + if (error) + return error; + } else { + dev_err(&pdev->dev, "Missing platform data\n"); + return -EINVAL; + } + + haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic"); + if (IS_ERR(haptic->regulator)) { + dev_err(&pdev->dev, "failed to get regulator\n"); + return PTR_ERR(haptic->regulator); + } + + input_dev = devm_input_allocate_device(&pdev->dev); + if (!input_dev) + return -ENOMEM; + + haptic->input_dev = input_dev; + haptic->input_dev->name = "regulator-haptic"; + haptic->input_dev->dev.parent = &pdev->dev; + haptic->input_dev->close = regulator_haptic_close; + input_set_drvdata(haptic->input_dev, haptic); + input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE); + + error = input_ff_create_memless(input_dev, NULL, + regulator_haptic_play_effect); + if (error) { + dev_err(&pdev->dev, "failed to create force-feedback\n"); + return error; + } + + error = input_register_device(haptic->input_dev); + if (error) { + dev_err(&pdev->dev, "failed to register input device\n"); + return error; + } + + return 0; +} + +static int __maybe_unused regulator_haptic_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct regulator_haptic *haptic = platform_get_drvdata(pdev); + int error; + + error = mutex_lock_interruptible(&haptic->mutex); + if (error) + return error; + + regulator_haptic_set_voltage(haptic, 0); + regulator_haptic_toggle(haptic, false); + + haptic->suspended = true; + + mutex_unlock(&haptic->mutex); + + return 0; +} + +static int __maybe_unused regulator_haptic_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct regulator_haptic *haptic = platform_get_drvdata(pdev); + unsigned int magnitude; + + mutex_lock(&haptic->mutex); + + haptic->suspended = false; + + magnitude = ACCESS_ONCE(haptic->magnitude); + if (magnitude) { + regulator_haptic_set_voltage(haptic, magnitude); + regulator_haptic_toggle(haptic, true); + } + + mutex_unlock(&haptic->mutex); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops, + regulator_haptic_suspend, regulator_haptic_resume); + +static struct of_device_id regulator_haptic_dt_match[] = { + { .compatible = "regulator-haptic" }, + { /* sentinel */ }, +}; + +static struct platform_driver regulator_haptic_driver = { + .probe = regulator_haptic_probe, + .driver = { + .name = "regulator-haptic", + .of_match_table = regulator_haptic_dt_match, + .pm = ®ulator_haptic_pm_ops, + }, +}; +module_platform_driver(regulator_haptic_driver); + +MODULE_AUTHOR("Jaewon Kim "); +MODULE_AUTHOR("Hyunhee Kim "); +MODULE_DESCRIPTION("Regulator haptic driver"); +MODULE_LICENSE("GPL"); -- cgit v1.1