/* * 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); uint64_t 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 = (int64_t)(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; } #ifdef CONFIG_PM_SLEEP static int 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 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; } #endif 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");