drivers/input/misc/max77693-haptic.c

   1 /*
   2  * MAXIM MAX77693 Haptic device driver
   3  *
   4  * Copyright (C) 2014 Samsung Electronics
   5  * Jaewon Kim <jaewon02.kim@samsung.com>
   6  *
   7  * This program is not provided / owned by Maxim Integrated Products.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/init.h>
  17 #include <linux/i2c.h>
  18 #include <linux/regmap.h>
  19 #include <linux/input.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/pwm.h>
  23 #include <linux/slab.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/regulator/consumer.h>
  26 #include <linux/mfd/max77693.h>
  27 #include <linux/mfd/max77693-private.h>
  28
  29 #define MAX_MAGNITUDE_SHIFT     16
  30
  31 enum max77693_haptic_motor_type {
  32         MAX77693_HAPTIC_ERM = 0,
  33         MAX77693_HAPTIC_LRA,
  34 };
  35
  36 enum max77693_haptic_pulse_mode {
  37         MAX77693_HAPTIC_EXTERNAL_MODE = 0,
  38         MAX77693_HAPTIC_INTERNAL_MODE,
  39 };
  40
  41 enum max77693_haptic_pwm_divisor {
  42         MAX77693_HAPTIC_PWM_DIVISOR_32 = 0,
  43         MAX77693_HAPTIC_PWM_DIVISOR_64,
  44         MAX77693_HAPTIC_PWM_DIVISOR_128,
  45         MAX77693_HAPTIC_PWM_DIVISOR_256,
  46 };
  47
  48 struct max77693_haptic {
  49         struct regmap *regmap_pmic;
  50         struct regmap *regmap_haptic;
  51         struct device *dev;
  52         struct input_dev *input_dev;
  53         struct pwm_device *pwm_dev;
  54         struct regulator *motor_reg;
  55
  56         bool enabled;
  57         bool suspend_state;
  58         unsigned int magnitude;
  59         unsigned int pwm_duty;
  60         enum max77693_haptic_motor_type type;
  61         enum max77693_haptic_pulse_mode mode;
  62         enum max77693_haptic_pwm_divisor pwm_divisor;
  63
  64         struct work_struct work;
  65 };
  66
  67 static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic)
  68 {
  69         int delta = (haptic->pwm_dev->period + haptic->pwm_duty) / 2;
  70         int error;
  71
  72         error = pwm_config(haptic->pwm_dev, delta, haptic->pwm_dev->period);
  73         if (error) {
  74                 dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
  75                 return error;
  76         }
  77
  78         return 0;
  79 }
  80
  81 static int max77693_haptic_configure(struct max77693_haptic *haptic,
  82                                      bool enable)
  83 {
  84         unsigned int value;
  85         int error;
  86
  87         value = ((haptic->type << MAX77693_CONFIG2_MODE) |
  88                 (enable << MAX77693_CONFIG2_MEN) |
  89                 (haptic->mode << MAX77693_CONFIG2_HTYP) |
  90                 (haptic->pwm_divisor));
  91
  92         error = regmap_write(haptic->regmap_haptic,
  93                              MAX77693_HAPTIC_REG_CONFIG2, value);
  94         if (error) {
  95                 dev_err(haptic->dev,
  96                         "failed to update haptic config: %d\n", error);
  97                 return error;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable)
 104 {
 105         int error;
 106
 107         error = regmap_update_bits(haptic->regmap_pmic,
 108                                    MAX77693_PMIC_REG_LSCNFG,
 109                                    MAX77693_PMIC_LOW_SYS_MASK,
 110                                    enable << MAX77693_PMIC_LOW_SYS_SHIFT);
 111         if (error) {
 112                 dev_err(haptic->dev, "cannot update pmic regmap: %d\n", error);
 113                 return error;
 114         }
 115
 116         return 0;
 117 }
 118
 119 static void max77693_haptic_enable(struct max77693_haptic *haptic)
 120 {
 121         int error;
 122
 123         if (haptic->enabled)
 124                 return;
 125
 126         error = pwm_enable(haptic->pwm_dev);
 127         if (error) {
 128                 dev_err(haptic->dev,
 129                         "failed to enable haptic pwm device: %d\n", error);
 130                 return;
 131         }
 132
 133         error = max77693_haptic_lowsys(haptic, true);
 134         if (error)
 135                 goto err_enable_lowsys;
 136
 137         error = max77693_haptic_configure(haptic, true);
 138         if (error)
 139                 goto err_enable_config;
 140
 141         haptic->enabled = true;
 142
 143         return;
 144
 145 err_enable_config:
 146         max77693_haptic_lowsys(haptic, false);
 147 err_enable_lowsys:
 148         pwm_disable(haptic->pwm_dev);
 149 }
 150
 151 static void max77693_haptic_disable(struct max77693_haptic *haptic)
 152 {
 153         int error;
 154
 155         if (!haptic->enabled)
 156                 return;
 157
 158         error = max77693_haptic_configure(haptic, false);
 159         if (error)
 160                 return;
 161
 162         error = max77693_haptic_lowsys(haptic, false);
 163         if (error)
 164                 goto err_disable_lowsys;
 165
 166         pwm_disable(haptic->pwm_dev);
 167         haptic->enabled = false;
 168
 169         return;
 170
 171 err_disable_lowsys:
 172         max77693_haptic_configure(haptic, true);
 173 }
 174
 175 static void max77693_haptic_play_work(struct work_struct *work)
 176 {
 177         struct max77693_haptic *haptic =
 178                         container_of(work, struct max77693_haptic, work);
 179         int error;
 180
 181         error = max77693_haptic_set_duty_cycle(haptic);
 182         if (error) {
 183                 dev_err(haptic->dev, "failed to set duty cycle: %d\n", error);
 184                 return;
 185         }
 186
 187         if (haptic->magnitude)
 188                 max77693_haptic_enable(haptic);
 189         else
 190                 max77693_haptic_disable(haptic);
 191 }
 192
 193 static int max77693_haptic_play_effect(struct input_dev *dev, void *data,
 194                                        struct ff_effect *effect)
 195 {
 196         struct max77693_haptic *haptic = input_get_drvdata(dev);
 197         u64 period_mag_multi;
 198
 199         haptic->magnitude = effect->u.rumble.strong_magnitude;
 200         if (!haptic->magnitude)
 201                 haptic->magnitude = effect->u.rumble.weak_magnitude;
 202
 203         /*
 204          * The magnitude comes from force-feedback interface.
 205          * The formula to convert magnitude to pwm_duty as follows:
 206          * - pwm_duty = (magnitude * pwm_period) / MAX_MAGNITUDE(0xFFFF)
 207          */
 208         period_mag_multi = (u64)haptic->pwm_dev->period * haptic->magnitude;
 209         haptic->pwm_duty = (unsigned int)(period_mag_multi >>
 210                                                 MAX_MAGNITUDE_SHIFT);
 211
 212         schedule_work(&haptic->work);
 213
 214         return 0;
 215 }
 216
 217 static int max77693_haptic_open(struct input_dev *dev)
 218 {
 219         struct max77693_haptic *haptic = input_get_drvdata(dev);
 220         int error;
 221
 222         error = regulator_enable(haptic->motor_reg);
 223         if (error) {
 224                 dev_err(haptic->dev,
 225                         "failed to enable regulator: %d\n", error);
 226                 return error;
 227         }
 228
 229         return 0;
 230 }
 231
 232 static void max77693_haptic_close(struct input_dev *dev)
 233 {
 234         struct max77693_haptic *haptic = input_get_drvdata(dev);
 235         int error;
 236
 237         cancel_work_sync(&haptic->work);
 238         max77693_haptic_disable(haptic);
 239
 240         error = regulator_disable(haptic->motor_reg);
 241         if (error)
 242                 dev_err(haptic->dev,
 243                         "failed to disable regulator: %d\n", error);
 244 }
 245
 246 static int max77693_haptic_probe(struct platform_device *pdev)
 247 {
 248         struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
 249         struct max77693_haptic *haptic;
 250         int error;
 251
 252         haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
 253         if (!haptic)
 254                 return -ENOMEM;
 255
 256         haptic->regmap_pmic = max77693->regmap;
 257         haptic->regmap_haptic = max77693->regmap_haptic;
 258         haptic->dev = &pdev->dev;
 259         haptic->type = MAX77693_HAPTIC_LRA;
 260         haptic->mode = MAX77693_HAPTIC_EXTERNAL_MODE;
 261         haptic->pwm_divisor = MAX77693_HAPTIC_PWM_DIVISOR_128;
 262         haptic->suspend_state = false;
 263
 264         INIT_WORK(&haptic->work, max77693_haptic_play_work);
 265
 266         /* Get pwm and regulatot for haptic device */
 267         haptic->pwm_dev = devm_pwm_get(&pdev->dev, NULL);
 268         if (IS_ERR(haptic->pwm_dev)) {
 269                 dev_err(&pdev->dev, "failed to get pwm device\n");
 270                 return PTR_ERR(haptic->pwm_dev);
 271         }
 272
 273         haptic->motor_reg = devm_regulator_get(&pdev->dev, "haptic");
 274         if (IS_ERR(haptic->motor_reg)) {
 275                 dev_err(&pdev->dev, "failed to get regulator\n");
 276                 return PTR_ERR(haptic->motor_reg);
 277         }
 278
 279         /* Initialize input device for haptic device */
 280         haptic->input_dev = devm_input_allocate_device(&pdev->dev);
 281         if (!haptic->input_dev) {
 282                 dev_err(&pdev->dev, "failed to allocate input device\n");
 283                 return -ENOMEM;
 284         }
 285
 286         haptic->input_dev->name = "max77693-haptic";
 287         haptic->input_dev->id.version = 1;
 288         haptic->input_dev->dev.parent = &pdev->dev;
 289         haptic->input_dev->open = max77693_haptic_open;
 290         haptic->input_dev->close = max77693_haptic_close;
 291         input_set_drvdata(haptic->input_dev, haptic);
 292         input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
 293
 294         error = input_ff_create_memless(haptic->input_dev, NULL,
 295                                 max77693_haptic_play_effect);
 296         if (error) {
 297                 dev_err(&pdev->dev, "failed to create force-feedback\n");
 298                 return error;
 299         }
 300
 301         error = input_register_device(haptic->input_dev);
 302         if (error) {
 303                 dev_err(&pdev->dev, "failed to register input device\n");
 304                 return error;
 305         }
 306
 307         platform_set_drvdata(pdev, haptic);
 308
 309         return 0;
 310 }
 311
 312 static int __maybe_unused max77693_haptic_suspend(struct device *dev)
 313 {
 314         struct platform_device *pdev = to_platform_device(dev);
 315         struct max77693_haptic *haptic = platform_get_drvdata(pdev);
 316
 317         if (haptic->enabled) {
 318                 max77693_haptic_disable(haptic);
 319                 haptic->suspend_state = true;
 320         }
 321
 322         return 0;
 323 }
 324
 325 static int __maybe_unused max77693_haptic_resume(struct device *dev)
 326 {
 327         struct platform_device *pdev = to_platform_device(dev);
 328         struct max77693_haptic *haptic = platform_get_drvdata(pdev);
 329
 330         if (haptic->suspend_state) {
 331                 max77693_haptic_enable(haptic);
 332                 haptic->suspend_state = false;
 333         }
 334
 335         return 0;
 336 }
 337
 338 static SIMPLE_DEV_PM_OPS(max77693_haptic_pm_ops,
 339                          max77693_haptic_suspend, max77693_haptic_resume);
 340
 341 static struct platform_driver max77693_haptic_driver = {
 342         .driver         = {
 343                 .name   = "max77693-haptic",
 344                 .pm     = &max77693_haptic_pm_ops,
 345         },
 346         .probe          = max77693_haptic_probe,
 347 };
 348 module_platform_driver(max77693_haptic_driver);
 349
 350 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 351 MODULE_DESCRIPTION("MAXIM MAX77693 Haptic driver");
 352 MODULE_ALIAS("platform:max77693-haptic");
 353 MODULE_LICENSE("GPL");