diff options
Diffstat (limited to 'drivers/input/misc/regulator-haptic.c')
| -rw-r--r-- | drivers/input/misc/regulator-haptic.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/input/misc/regulator-haptic.c b/drivers/input/misc/regulator-haptic.c new file mode 100644 index 000000000..a661e7754 --- /dev/null +++ b/drivers/input/misc/regulator-haptic.c @@ -0,0 +1,264 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Regulator haptic driver + * + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * Author: Jaewon Kim <jaewon02.kim@samsung.com> + * Author: Hyunhee Kim <hyunhee.kim@samsung.com> + */ + +#include <linux/input.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_data/regulator-haptic.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> + +#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; + } + + regulator_haptic_toggle(haptic, !!magnitude); + + return 0; +} + +static void regulator_haptic_work(struct work_struct *work) +{ + struct regulator_haptic *haptic = container_of(work, + struct regulator_haptic, work); + + mutex_lock(&haptic->mutex); + + if (!haptic->suspended) + regulator_haptic_set_voltage(haptic, haptic->magnitude); + + 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); +} + +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 device 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); + + 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 = READ_ONCE(haptic->magnitude); + if (magnitude) + regulator_haptic_set_voltage(haptic, magnitude); + + mutex_unlock(&haptic->mutex); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops, + regulator_haptic_suspend, regulator_haptic_resume); + +static const struct of_device_id regulator_haptic_dt_match[] = { + { .compatible = "regulator-haptic" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, regulator_haptic_dt_match); + +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 <jaewon02.kim@samsung.com>"); +MODULE_AUTHOR("Hyunhee Kim <hyunhee.kim@samsung.com>"); +MODULE_DESCRIPTION("Regulator haptic driver"); +MODULE_LICENSE("GPL"); |