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Release 4.11 drivers/input/misc/max77693-haptic.c

/*
 * MAXIM MAX77693/MAX77843 Haptic device driver
 *
 * Copyright (C) 2014,2015 Samsung Electronics
 * Jaewon Kim <jaewon02.kim@samsung.com>
 * Krzysztof Kozlowski <krzk@kernel.org>
 *
 * 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 <linux/err.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/regulator/consumer.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-common.h>
#include <linux/mfd/max77693-private.h>
#include <linux/mfd/max77843-private.h>


#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 {
	
enum max77693_types dev_type;

	
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;

	
struct work_struct work;
};


static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic) { struct pwm_args pargs; int delta; int error; pwm_get_args(haptic->pwm_dev, &pargs); delta = (pargs.period + haptic->pwm_duty) / 2; error = pwm_config(haptic->pwm_dev, delta, pargs.period); if (error) { dev_err(haptic->dev, "failed to configure pwm: %d\n", error); return error; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim6072.29%150.00%
Boris Brezillon2327.71%150.00%
Total83100.00%2100.00%


static int max77843_haptic_bias(struct max77693_haptic *haptic, bool on) { int error; if (haptic->dev_type != TYPE_MAX77843) return 0; error = regmap_update_bits(haptic->regmap_haptic, MAX77843_SYS_REG_MAINCTRL1, MAX77843_MAINCTRL1_BIASEN_MASK, on << MAINCTRL1_BIASEN_SHIFT); if (error) { dev_err(haptic->dev, "failed to %s bias: %d\n", on ? "enable" : "disable", error); return error; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Krzysztof Kozlowski74100.00%1100.00%
Total74100.00%1100.00%


static int max77693_haptic_configure(struct max77693_haptic *haptic, bool enable) { unsigned int value, config_reg; int error; switch (haptic->dev_type) { case TYPE_MAX77693: value = ((haptic->type << MAX77693_CONFIG2_MODE) | (enable << MAX77693_CONFIG2_MEN) | (haptic->mode << MAX77693_CONFIG2_HTYP) | MAX77693_HAPTIC_PWM_DIVISOR_128); config_reg = MAX77693_HAPTIC_REG_CONFIG2; break; case TYPE_MAX77843: value = (haptic->type << MCONFIG_MODE_SHIFT) | (enable << MCONFIG_MEN_SHIFT) | MAX77693_HAPTIC_PWM_DIVISOR_128; config_reg = MAX77843_HAP_REG_MCONFIG; break; default: return -EINVAL; } error = regmap_write(haptic->regmap_haptic, config_reg, value); if (error) { dev_err(haptic->dev, "failed to update haptic config: %d\n", error); return error; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim8361.94%125.00%
Krzysztof Kozlowski5138.06%375.00%
Total134100.00%4100.00%


static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable) { int error; if (haptic->dev_type != TYPE_MAX77693) return 0; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim5783.82%150.00%
Krzysztof Kozlowski1116.18%150.00%
Total68100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim105100.00%1100.00%
Total105100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim75100.00%2100.00%
Total75100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim71100.00%1100.00%
Total71100.00%1100.00%


static int max77693_haptic_play_effect(struct input_dev *dev, void *data, struct ff_effect *effect) { struct max77693_haptic *haptic = input_get_drvdata(dev); struct pwm_args pargs; 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) */ pwm_get_args(haptic->pwm_dev, &pargs); period_mag_multi = (u64)pargs.period * haptic->magnitude; haptic->pwm_duty = (unsigned int)(period_mag_multi >> MAX_MAGNITUDE_SHIFT); schedule_work(&haptic->work); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim9782.91%133.33%
Boris Brezillon1613.68%133.33%
Dmitry Torokhov43.42%133.33%
Total117100.00%3100.00%


static int max77693_haptic_open(struct input_dev *dev) { struct max77693_haptic *haptic = input_get_drvdata(dev); int error; error = max77843_haptic_bias(haptic, true); if (error) return error; error = regulator_enable(haptic->motor_reg); if (error) { dev_err(haptic->dev, "failed to enable regulator: %d\n", error); return error; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim5677.78%150.00%
Krzysztof Kozlowski1622.22%150.00%
Total72100.00%2100.00%


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); max77843_haptic_bias(haptic, false); }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim6189.71%150.00%
Krzysztof Kozlowski710.29%150.00%
Total68100.00%2100.00%


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->dev = &pdev->dev; haptic->type = MAX77693_HAPTIC_LRA; haptic->mode = MAX77693_HAPTIC_EXTERNAL_MODE; haptic->suspend_state = false; /* Variant-specific init */ haptic->dev_type = platform_get_device_id(pdev)->driver_data; switch (haptic->dev_type) { case TYPE_MAX77693: haptic->regmap_haptic = max77693->regmap_haptic; break; case TYPE_MAX77843: haptic->regmap_haptic = max77693->regmap; break; default: dev_err(&pdev->dev, "unsupported device type: %u\n", haptic->dev_type); return -EINVAL; } 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); } /* * FIXME: pwm_apply_args() should be removed when switching to the * atomic PWM API. */ pwm_apply_args(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; }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim36583.72%125.00%
Krzysztof Kozlowski6314.45%250.00%
Boris Brezillon81.83%125.00%
Total436100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim5398.15%150.00%
Jingoo Han11.85%150.00%
Total54100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim5398.15%150.00%
Jingoo Han11.85%150.00%
Total54100.00%2100.00%

static SIMPLE_DEV_PM_OPS(max77693_haptic_pm_ops, max77693_haptic_suspend, max77693_haptic_resume); static const struct platform_device_id max77693_haptic_id[] = { { "max77693-haptic", TYPE_MAX77693 }, { "max77843-haptic", TYPE_MAX77843 }, {}, }; MODULE_DEVICE_TABLE(platform, max77693_haptic_id); static struct platform_driver max77693_haptic_driver = { .driver = { .name = "max77693-haptic", .pm = &max77693_haptic_pm_ops, }, .probe = max77693_haptic_probe, .id_table = max77693_haptic_id, }; module_platform_driver(max77693_haptic_driver); MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>"); MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); MODULE_DESCRIPTION("MAXIM 77693/77843 Haptic driver"); MODULE_ALIAS("platform:max77693-haptic"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Jaewon Kim133680.34%220.00%
Krzysztof Kozlowski27416.48%550.00%
Boris Brezillon472.83%110.00%
Dmitry Torokhov40.24%110.00%
Jingoo Han20.12%110.00%
Total1663100.00%10100.00%
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