linux/drivers/input/misc/max77693-haptic.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * MAXIM MAX77693/MAX77843 Haptic device driver
   4 *
   5 * Copyright (C) 2014,2015 Samsung Electronics
   6 * Jaewon Kim <jaewon02.kim@samsung.com>
   7 * Krzysztof Kozlowski <krzk@kernel.org>
   8 *
   9 * This program is not provided / owned by Maxim Integrated Products.
  10 */
  11
  12#include <linux/err.h>
  13#include <linux/init.h>
  14#include <linux/i2c.h>
  15#include <linux/regmap.h>
  16#include <linux/input.h>
  17#include <linux/module.h>
  18#include <linux/platform_device.h>
  19#include <linux/pwm.h>
  20#include <linux/slab.h>
  21#include <linux/workqueue.h>
  22#include <linux/regulator/consumer.h>
  23#include <linux/mfd/max77693.h>
  24#include <linux/mfd/max77693-common.h>
  25#include <linux/mfd/max77693-private.h>
  26#include <linux/mfd/max77843-private.h>
  27
  28#define MAX_MAGNITUDE_SHIFT     16
  29
  30enum max77693_haptic_motor_type {
  31        MAX77693_HAPTIC_ERM = 0,
  32        MAX77693_HAPTIC_LRA,
  33};
  34
  35enum max77693_haptic_pulse_mode {
  36        MAX77693_HAPTIC_EXTERNAL_MODE = 0,
  37        MAX77693_HAPTIC_INTERNAL_MODE,
  38};
  39
  40enum max77693_haptic_pwm_divisor {
  41        MAX77693_HAPTIC_PWM_DIVISOR_32 = 0,
  42        MAX77693_HAPTIC_PWM_DIVISOR_64,
  43        MAX77693_HAPTIC_PWM_DIVISOR_128,
  44        MAX77693_HAPTIC_PWM_DIVISOR_256,
  45};
  46
  47struct max77693_haptic {
  48        enum max77693_types dev_type;
  49
  50        struct regmap *regmap_pmic;
  51        struct regmap *regmap_haptic;
  52        struct device *dev;
  53        struct input_dev *input_dev;
  54        struct pwm_device *pwm_dev;
  55        struct regulator *motor_reg;
  56
  57        bool enabled;
  58        bool suspend_state;
  59        unsigned int magnitude;
  60        unsigned int pwm_duty;
  61        enum max77693_haptic_motor_type type;
  62        enum max77693_haptic_pulse_mode mode;
  63
  64        struct work_struct work;
  65};
  66
  67static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic)
  68{
  69        struct pwm_args pargs;
  70        int delta;
  71        int error;
  72
  73        pwm_get_args(haptic->pwm_dev, &pargs);
  74        delta = (pargs.period + haptic->pwm_duty) / 2;
  75        error = pwm_config(haptic->pwm_dev, delta, pargs.period);
  76        if (error) {
  77                dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
  78                return error;
  79        }
  80
  81        return 0;
  82}
  83
  84static int max77843_haptic_bias(struct max77693_haptic *haptic, bool on)
  85{
  86        int error;
  87
  88        if (haptic->dev_type != TYPE_MAX77843)
  89                return 0;
  90
  91        error = regmap_update_bits(haptic->regmap_haptic,
  92                                   MAX77843_SYS_REG_MAINCTRL1,
  93                                   MAX77843_MAINCTRL1_BIASEN_MASK,
  94                                   on << MAINCTRL1_BIASEN_SHIFT);
  95        if (error) {
  96                dev_err(haptic->dev, "failed to %s bias: %d\n",
  97                        on ? "enable" : "disable", error);
  98                return error;
  99        }
 100
 101        return 0;
 102}
 103
 104static int max77693_haptic_configure(struct max77693_haptic *haptic,
 105                                     bool enable)
 106{
 107        unsigned int value, config_reg;
 108        int error;
 109
 110        switch (haptic->dev_type) {
 111        case TYPE_MAX77693:
 112                value = ((haptic->type << MAX77693_CONFIG2_MODE) |
 113                        (enable << MAX77693_CONFIG2_MEN) |
 114                        (haptic->mode << MAX77693_CONFIG2_HTYP) |
 115                        MAX77693_HAPTIC_PWM_DIVISOR_128);
 116                config_reg = MAX77693_HAPTIC_REG_CONFIG2;
 117                break;
 118        case TYPE_MAX77843:
 119                value = (haptic->type << MCONFIG_MODE_SHIFT) |
 120                        (enable << MCONFIG_MEN_SHIFT) |
 121                        MAX77693_HAPTIC_PWM_DIVISOR_128;
 122                config_reg = MAX77843_HAP_REG_MCONFIG;
 123                break;
 124        default:
 125                return -EINVAL;
 126        }
 127
 128        error = regmap_write(haptic->regmap_haptic,
 129                             config_reg, value);
 130        if (error) {
 131                dev_err(haptic->dev,
 132                        "failed to update haptic config: %d\n", error);
 133                return error;
 134        }
 135
 136        return 0;
 137}
 138
 139static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable)
 140{
 141        int error;
 142
 143        if (haptic->dev_type != TYPE_MAX77693)
 144                return 0;
 145
 146        error = regmap_update_bits(haptic->regmap_pmic,
 147                                   MAX77693_PMIC_REG_LSCNFG,
 148                                   MAX77693_PMIC_LOW_SYS_MASK,
 149                                   enable << MAX77693_PMIC_LOW_SYS_SHIFT);
 150        if (error) {
 151                dev_err(haptic->dev, "cannot update pmic regmap: %d\n", error);
 152                return error;
 153        }
 154
 155        return 0;
 156}
 157
 158static void max77693_haptic_enable(struct max77693_haptic *haptic)
 159{
 160        int error;
 161
 162        if (haptic->enabled)
 163                return;
 164
 165        error = pwm_enable(haptic->pwm_dev);
 166        if (error) {
 167                dev_err(haptic->dev,
 168                        "failed to enable haptic pwm device: %d\n", error);
 169                return;
 170        }
 171
 172        error = max77693_haptic_lowsys(haptic, true);
 173        if (error)
 174                goto err_enable_lowsys;
 175
 176        error = max77693_haptic_configure(haptic, true);
 177        if (error)
 178                goto err_enable_config;
 179
 180        haptic->enabled = true;
 181
 182        return;
 183
 184err_enable_config:
 185        max77693_haptic_lowsys(haptic, false);
 186err_enable_lowsys:
 187        pwm_disable(haptic->pwm_dev);
 188}
 189
 190static void max77693_haptic_disable(struct max77693_haptic *haptic)
 191{
 192        int error;
 193
 194        if (!haptic->enabled)
 195                return;
 196
 197        error = max77693_haptic_configure(haptic, false);
 198        if (error)
 199                return;
 200
 201        error = max77693_haptic_lowsys(haptic, false);
 202        if (error)
 203                goto err_disable_lowsys;
 204
 205        pwm_disable(haptic->pwm_dev);
 206        haptic->enabled = false;
 207
 208        return;
 209
 210err_disable_lowsys:
 211        max77693_haptic_configure(haptic, true);
 212}
 213
 214static void max77693_haptic_play_work(struct work_struct *work)
 215{
 216        struct max77693_haptic *haptic =
 217                        container_of(work, struct max77693_haptic, work);
 218        int error;
 219
 220        error = max77693_haptic_set_duty_cycle(haptic);
 221        if (error) {
 222                dev_err(haptic->dev, "failed to set duty cycle: %d\n", error);
 223                return;
 224        }
 225
 226        if (haptic->magnitude)
 227                max77693_haptic_enable(haptic);
 228        else
 229                max77693_haptic_disable(haptic);
 230}
 231
 232static int max77693_haptic_play_effect(struct input_dev *dev, void *data,
 233                                       struct ff_effect *effect)
 234{
 235        struct max77693_haptic *haptic = input_get_drvdata(dev);
 236        struct pwm_args pargs;
 237        u64 period_mag_multi;
 238
 239        haptic->magnitude = effect->u.rumble.strong_magnitude;
 240        if (!haptic->magnitude)
 241                haptic->magnitude = effect->u.rumble.weak_magnitude;
 242
 243        /*
 244         * The magnitude comes from force-feedback interface.
 245         * The formula to convert magnitude to pwm_duty as follows:
 246         * - pwm_duty = (magnitude * pwm_period) / MAX_MAGNITUDE(0xFFFF)
 247         */
 248        pwm_get_args(haptic->pwm_dev, &pargs);
 249        period_mag_multi = (u64)pargs.period * haptic->magnitude;
 250        haptic->pwm_duty = (unsigned int)(period_mag_multi >>
 251                                                MAX_MAGNITUDE_SHIFT);
 252
 253        schedule_work(&haptic->work);
 254
 255        return 0;
 256}
 257
 258static int max77693_haptic_open(struct input_dev *dev)
 259{
 260        struct max77693_haptic *haptic = input_get_drvdata(dev);
 261        int error;
 262
 263        error = max77843_haptic_bias(haptic, true);
 264        if (error)
 265                return error;
 266
 267        error = regulator_enable(haptic->motor_reg);
 268        if (error) {
 269                dev_err(haptic->dev,
 270                        "failed to enable regulator: %d\n", error);
 271                return error;
 272        }
 273
 274        return 0;
 275}
 276
 277static void max77693_haptic_close(struct input_dev *dev)
 278{
 279        struct max77693_haptic *haptic = input_get_drvdata(dev);
 280        int error;
 281
 282        cancel_work_sync(&haptic->work);
 283        max77693_haptic_disable(haptic);
 284
 285        error = regulator_disable(haptic->motor_reg);
 286        if (error)
 287                dev_err(haptic->dev,
 288                        "failed to disable regulator: %d\n", error);
 289
 290        max77843_haptic_bias(haptic, false);
 291}
 292
 293static int max77693_haptic_probe(struct platform_device *pdev)
 294{
 295        struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
 296        struct max77693_haptic *haptic;
 297        int error;
 298
 299        haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
 300        if (!haptic)
 301                return -ENOMEM;
 302
 303        haptic->regmap_pmic = max77693->regmap;
 304        haptic->dev = &pdev->dev;
 305        haptic->type = MAX77693_HAPTIC_LRA;
 306        haptic->mode = MAX77693_HAPTIC_EXTERNAL_MODE;
 307        haptic->suspend_state = false;
 308
 309        /* Variant-specific init */
 310        haptic->dev_type = platform_get_device_id(pdev)->driver_data;
 311        switch (haptic->dev_type) {
 312        case TYPE_MAX77693:
 313                haptic->regmap_haptic = max77693->regmap_haptic;
 314                break;
 315        case TYPE_MAX77843:
 316                haptic->regmap_haptic = max77693->regmap;
 317                break;
 318        default:
 319                dev_err(&pdev->dev, "unsupported device type: %u\n",
 320                        haptic->dev_type);
 321                return -EINVAL;
 322        }
 323
 324        INIT_WORK(&haptic->work, max77693_haptic_play_work);
 325
 326        /* Get pwm and regulatot for haptic device */
 327        haptic->pwm_dev = devm_pwm_get(&pdev->dev, NULL);
 328        if (IS_ERR(haptic->pwm_dev)) {
 329                dev_err(&pdev->dev, "failed to get pwm device\n");
 330                return PTR_ERR(haptic->pwm_dev);
 331        }
 332
 333        /*
 334         * FIXME: pwm_apply_args() should be removed when switching to the
 335         * atomic PWM API.
 336         */
 337        pwm_apply_args(haptic->pwm_dev);
 338
 339        haptic->motor_reg = devm_regulator_get(&pdev->dev, "haptic");
 340        if (IS_ERR(haptic->motor_reg)) {
 341                dev_err(&pdev->dev, "failed to get regulator\n");
 342                return PTR_ERR(haptic->motor_reg);
 343        }
 344
 345        /* Initialize input device for haptic device */
 346        haptic->input_dev = devm_input_allocate_device(&pdev->dev);
 347        if (!haptic->input_dev) {
 348                dev_err(&pdev->dev, "failed to allocate input device\n");
 349                return -ENOMEM;
 350        }
 351
 352        haptic->input_dev->name = "max77693-haptic";
 353        haptic->input_dev->id.version = 1;
 354        haptic->input_dev->dev.parent = &pdev->dev;
 355        haptic->input_dev->open = max77693_haptic_open;
 356        haptic->input_dev->close = max77693_haptic_close;
 357        input_set_drvdata(haptic->input_dev, haptic);
 358        input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
 359
 360        error = input_ff_create_memless(haptic->input_dev, NULL,
 361                                max77693_haptic_play_effect);
 362        if (error) {
 363                dev_err(&pdev->dev, "failed to create force-feedback\n");
 364                return error;
 365        }
 366
 367        error = input_register_device(haptic->input_dev);
 368        if (error) {
 369                dev_err(&pdev->dev, "failed to register input device\n");
 370                return error;
 371        }
 372
 373        platform_set_drvdata(pdev, haptic);
 374
 375        return 0;
 376}
 377
 378static int __maybe_unused max77693_haptic_suspend(struct device *dev)
 379{
 380        struct platform_device *pdev = to_platform_device(dev);
 381        struct max77693_haptic *haptic = platform_get_drvdata(pdev);
 382
 383        if (haptic->enabled) {
 384                max77693_haptic_disable(haptic);
 385                haptic->suspend_state = true;
 386        }
 387
 388        return 0;
 389}
 390
 391static int __maybe_unused max77693_haptic_resume(struct device *dev)
 392{
 393        struct platform_device *pdev = to_platform_device(dev);
 394        struct max77693_haptic *haptic = platform_get_drvdata(pdev);
 395
 396        if (haptic->suspend_state) {
 397                max77693_haptic_enable(haptic);
 398                haptic->suspend_state = false;
 399        }
 400
 401        return 0;
 402}
 403
 404static SIMPLE_DEV_PM_OPS(max77693_haptic_pm_ops,
 405                         max77693_haptic_suspend, max77693_haptic_resume);
 406
 407static const struct platform_device_id max77693_haptic_id[] = {
 408        { "max77693-haptic", TYPE_MAX77693 },
 409        { "max77843-haptic", TYPE_MAX77843 },
 410        {},
 411};
 412MODULE_DEVICE_TABLE(platform, max77693_haptic_id);
 413
 414static struct platform_driver max77693_haptic_driver = {
 415        .driver         = {
 416                .name   = "max77693-haptic",
 417                .pm     = &max77693_haptic_pm_ops,
 418        },
 419        .probe          = max77693_haptic_probe,
 420        .id_table       = max77693_haptic_id,
 421};
 422module_platform_driver(max77693_haptic_driver);
 423
 424MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 425MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
 426MODULE_DESCRIPTION("MAXIM 77693/77843 Haptic driver");
 427MODULE_LICENSE("GPL");
 428