From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/input/misc/max77693-haptic.c | 353 +++++++++++++++++++++++++++++++++++ 1 file changed, 353 insertions(+) create mode 100644 drivers/input/misc/max77693-haptic.c (limited to 'drivers/input/misc/max77693-haptic.c') diff --git a/drivers/input/misc/max77693-haptic.c b/drivers/input/misc/max77693-haptic.c new file mode 100644 index 000000000..39e930c10 --- /dev/null +++ b/drivers/input/misc/max77693-haptic.c @@ -0,0 +1,353 @@ +/* + * MAXIM MAX77693 Haptic device driver + * + * Copyright (C) 2014 Samsung Electronics + * Jaewon Kim + * + * This program is not provided / owned by Maxim Integrated Products. + * + * 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 +#include +#include +#include +#include + +#define MAX_MAGNITUDE_SHIFT 16 + +enum max77693_haptic_motor_type { + MAX77693_HAPTIC_ERM = 0, + MAX77693_HAPTIC_LRA, +}; + +enum max77693_haptic_pulse_mode { + MAX77693_HAPTIC_EXTERNAL_MODE = 0, + MAX77693_HAPTIC_INTERNAL_MODE, +}; + +enum max77693_haptic_pwm_divisor { + MAX77693_HAPTIC_PWM_DIVISOR_32 = 0, + MAX77693_HAPTIC_PWM_DIVISOR_64, + MAX77693_HAPTIC_PWM_DIVISOR_128, + MAX77693_HAPTIC_PWM_DIVISOR_256, +}; + +struct max77693_haptic { + struct regmap *regmap_pmic; + struct regmap *regmap_haptic; + struct device *dev; + struct input_dev *input_dev; + struct pwm_device *pwm_dev; + struct regulator *motor_reg; + + bool enabled; + bool suspend_state; + unsigned int magnitude; + unsigned int pwm_duty; + enum max77693_haptic_motor_type type; + enum max77693_haptic_pulse_mode mode; + enum max77693_haptic_pwm_divisor pwm_divisor; + + struct work_struct work; +}; + +static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic) +{ + int delta = (haptic->pwm_dev->period + haptic->pwm_duty) / 2; + int error; + + error = pwm_config(haptic->pwm_dev, delta, haptic->pwm_dev->period); + if (error) { + dev_err(haptic->dev, "failed to configure pwm: %d\n", error); + return error; + } + + return 0; +} + +static int max77693_haptic_configure(struct max77693_haptic *haptic, + bool enable) +{ + unsigned int value; + int error; + + value = ((haptic->type << MAX77693_CONFIG2_MODE) | + (enable << MAX77693_CONFIG2_MEN) | + (haptic->mode << MAX77693_CONFIG2_HTYP) | + (haptic->pwm_divisor)); + + error = regmap_write(haptic->regmap_haptic, + MAX77693_HAPTIC_REG_CONFIG2, value); + if (error) { + dev_err(haptic->dev, + "failed to update haptic config: %d\n", error); + return error; + } + + return 0; +} + +static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable) +{ + int error; + + error = regmap_update_bits(haptic->regmap_pmic, + MAX77693_PMIC_REG_LSCNFG, + MAX77693_PMIC_LOW_SYS_MASK, + enable << MAX77693_PMIC_LOW_SYS_SHIFT); + if (error) { + dev_err(haptic->dev, "cannot update pmic regmap: %d\n", error); + return error; + } + + return 0; +} + +static void max77693_haptic_enable(struct max77693_haptic *haptic) +{ + int error; + + if (haptic->enabled) + return; + + error = pwm_enable(haptic->pwm_dev); + if (error) { + dev_err(haptic->dev, + "failed to enable haptic pwm device: %d\n", error); + return; + } + + error = max77693_haptic_lowsys(haptic, true); + if (error) + goto err_enable_lowsys; + + error = max77693_haptic_configure(haptic, true); + if (error) + goto err_enable_config; + + haptic->enabled = true; + + return; + +err_enable_config: + max77693_haptic_lowsys(haptic, false); +err_enable_lowsys: + pwm_disable(haptic->pwm_dev); +} + +static void max77693_haptic_disable(struct max77693_haptic *haptic) +{ + int error; + + if (!haptic->enabled) + return; + + error = max77693_haptic_configure(haptic, false); + if (error) + return; + + error = max77693_haptic_lowsys(haptic, false); + if (error) + goto err_disable_lowsys; + + pwm_disable(haptic->pwm_dev); + haptic->enabled = false; + + return; + +err_disable_lowsys: + max77693_haptic_configure(haptic, true); +} + +static void max77693_haptic_play_work(struct work_struct *work) +{ + struct max77693_haptic *haptic = + container_of(work, struct max77693_haptic, work); + int error; + + error = max77693_haptic_set_duty_cycle(haptic); + if (error) { + dev_err(haptic->dev, "failed to set duty cycle: %d\n", error); + return; + } + + if (haptic->magnitude) + max77693_haptic_enable(haptic); + else + max77693_haptic_disable(haptic); +} + +static int max77693_haptic_play_effect(struct input_dev *dev, void *data, + struct ff_effect *effect) +{ + struct max77693_haptic *haptic = input_get_drvdata(dev); + u64 period_mag_multi; + + haptic->magnitude = effect->u.rumble.strong_magnitude; + if (!haptic->magnitude) + haptic->magnitude = effect->u.rumble.weak_magnitude; + + /* + * The magnitude comes from force-feedback interface. + * The formula to convert magnitude to pwm_duty as follows: + * - pwm_duty = (magnitude * pwm_period) / MAX_MAGNITUDE(0xFFFF) + */ + period_mag_multi = (u64)haptic->pwm_dev->period * haptic->magnitude; + haptic->pwm_duty = (unsigned int)(period_mag_multi >> + MAX_MAGNITUDE_SHIFT); + + schedule_work(&haptic->work); + + return 0; +} + +static int max77693_haptic_open(struct input_dev *dev) +{ + struct max77693_haptic *haptic = input_get_drvdata(dev); + int error; + + error = regulator_enable(haptic->motor_reg); + if (error) { + dev_err(haptic->dev, + "failed to enable regulator: %d\n", error); + return error; + } + + return 0; +} + +static void max77693_haptic_close(struct input_dev *dev) +{ + struct max77693_haptic *haptic = input_get_drvdata(dev); + int error; + + cancel_work_sync(&haptic->work); + max77693_haptic_disable(haptic); + + error = regulator_disable(haptic->motor_reg); + if (error) + dev_err(haptic->dev, + "failed to disable regulator: %d\n", error); +} + +static int max77693_haptic_probe(struct platform_device *pdev) +{ + struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent); + struct max77693_haptic *haptic; + int error; + + haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL); + if (!haptic) + return -ENOMEM; + + haptic->regmap_pmic = max77693->regmap; + haptic->regmap_haptic = max77693->regmap_haptic; + haptic->dev = &pdev->dev; + haptic->type = MAX77693_HAPTIC_LRA; + haptic->mode = MAX77693_HAPTIC_EXTERNAL_MODE; + haptic->pwm_divisor = MAX77693_HAPTIC_PWM_DIVISOR_128; + haptic->suspend_state = false; + + INIT_WORK(&haptic->work, max77693_haptic_play_work); + + /* Get pwm and regulatot for haptic device */ + haptic->pwm_dev = devm_pwm_get(&pdev->dev, NULL); + if (IS_ERR(haptic->pwm_dev)) { + dev_err(&pdev->dev, "failed to get pwm device\n"); + return PTR_ERR(haptic->pwm_dev); + } + + haptic->motor_reg = devm_regulator_get(&pdev->dev, "haptic"); + if (IS_ERR(haptic->motor_reg)) { + dev_err(&pdev->dev, "failed to get regulator\n"); + return PTR_ERR(haptic->motor_reg); + } + + /* Initialize input device for haptic device */ + haptic->input_dev = devm_input_allocate_device(&pdev->dev); + if (!haptic->input_dev) { + dev_err(&pdev->dev, "failed to allocate input device\n"); + return -ENOMEM; + } + + haptic->input_dev->name = "max77693-haptic"; + haptic->input_dev->id.version = 1; + haptic->input_dev->dev.parent = &pdev->dev; + haptic->input_dev->open = max77693_haptic_open; + haptic->input_dev->close = max77693_haptic_close; + input_set_drvdata(haptic->input_dev, haptic); + input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE); + + error = input_ff_create_memless(haptic->input_dev, NULL, + max77693_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; + } + + platform_set_drvdata(pdev, haptic); + + return 0; +} + +static int __maybe_unused max77693_haptic_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct max77693_haptic *haptic = platform_get_drvdata(pdev); + + if (haptic->enabled) { + max77693_haptic_disable(haptic); + haptic->suspend_state = true; + } + + return 0; +} + +static int __maybe_unused max77693_haptic_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct max77693_haptic *haptic = platform_get_drvdata(pdev); + + if (haptic->suspend_state) { + max77693_haptic_enable(haptic); + haptic->suspend_state = false; + } + + return 0; +} + +static SIMPLE_DEV_PM_OPS(max77693_haptic_pm_ops, + max77693_haptic_suspend, max77693_haptic_resume); + +static struct platform_driver max77693_haptic_driver = { + .driver = { + .name = "max77693-haptic", + .pm = &max77693_haptic_pm_ops, + }, + .probe = max77693_haptic_probe, +}; +module_platform_driver(max77693_haptic_driver); + +MODULE_AUTHOR("Jaewon Kim "); +MODULE_DESCRIPTION("MAXIM MAX77693 Haptic driver"); +MODULE_ALIAS("platform:max77693-haptic"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3-54-g00ecf