kernel/drivers/input/misc/max77843-haptic.c

   1 /*
   2  * MAXIM MAX77693 Haptic device driver
   3  *
   4  * Copyright (C) 2015 Samsung Electronics
   5  * Author: Jaewon Kim <jaewon02.kim@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/i2c.h>
  15 #include <linux/init.h>
  16 #include <linux/input.h>
  17 #include <linux/mfd/max77843-private.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/pwm.h>
  21 #include <linux/regmap.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/slab.h>
  24 #include <linux/workqueue.h>
  25
  26 #define MAX_MAGNITUDE_SHIFT        16
  27
  28 enum max77843_haptic_motor_type {
  29         MAX77843_HAPTIC_ERM = 0,
  30         MAX77843_HAPTIC_LRA,
  31 };
  32
  33 enum max77843_haptic_pwm_divisor {
  34         MAX77843_HAPTIC_PWM_DIVISOR_32 = 0,
  35         MAX77843_HAPTIC_PWM_DIVISOR_64,
  36         MAX77843_HAPTIC_PWM_DIVISOR_128,
  37         MAX77843_HAPTIC_PWM_DIVISOR_256,
  38 };
  39
  40 struct max77843_haptic {
  41         struct regmap *regmap_haptic;
  42         struct device *dev;
  43         struct input_dev *input_dev;
  44         struct pwm_device *pwm_dev;
  45         struct regulator *motor_reg;
  46         struct work_struct work;
  47         struct mutex mutex;
  48
  49         unsigned int magnitude;
  50         unsigned int pwm_duty;
  51
  52         bool active;
  53         bool suspended;
  54
  55         enum max77843_haptic_motor_type type;
  56         enum max77843_haptic_pwm_divisor pwm_divisor;
  57 };
  58
  59 static int max77843_haptic_set_duty_cycle(struct max77843_haptic *haptic)
  60 {
  61         int delta = (haptic->pwm_dev->period + haptic->pwm_duty) / 2;
  62         int error;
  63
  64         error = pwm_config(haptic->pwm_dev, delta, haptic->pwm_dev->period);
  65         if (error) {
  66                 dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
  67                 return error;
  68         }
  69
  70         return 0;
  71 }
  72
  73 static int max77843_haptic_bias(struct max77843_haptic *haptic, bool on)
  74 {
  75         int error;
  76
  77         error = regmap_update_bits(haptic->regmap_haptic,
  78                                    MAX77843_SYS_REG_MAINCTRL1,
  79                                    MAX77843_MAINCTRL1_BIASEN_MASK,
  80                                    on << MAINCTRL1_BIASEN_SHIFT);
  81         if (error) {
  82                 dev_err(haptic->dev, "failed to %s bias: %d\n",
  83                         on ? "enable" : "disable", error);
  84                 return error;
  85         }
  86
  87         return 0;
  88 }
  89
  90 static int max77843_haptic_config(struct max77843_haptic *haptic, bool enable)
  91 {
  92         unsigned int value;
  93         int error;
  94
  95         value = (haptic->type << MCONFIG_MODE_SHIFT) |
  96                 (enable << MCONFIG_MEN_SHIFT) |
  97                 (haptic->pwm_divisor << MCONFIG_PDIV_SHIFT);
  98
  99         error = regmap_write(haptic->regmap_haptic,
 100                              MAX77843_HAP_REG_MCONFIG, value);
 101         if (error) {
 102                 dev_err(haptic->dev,
 103                         "failed to update haptic config: %d\n", error);
 104                 return error;
 105         }
 106
 107         return 0;
 108 }
 109
 110 static int max77843_haptic_enable(struct max77843_haptic *haptic)
 111 {
 112         int error;
 113
 114         if (haptic->active)
 115                 return 0;
 116
 117         error = pwm_enable(haptic->pwm_dev);
 118         if (error) {
 119                 dev_err(haptic->dev,
 120                         "failed to enable pwm device: %d\n", error);
 121                 return error;
 122         }
 123
 124         error = max77843_haptic_config(haptic, true);
 125         if (error)
 126                 goto err_config;
 127
 128         haptic->active = true;
 129
 130         return 0;
 131
 132 err_config:
 133         pwm_disable(haptic->pwm_dev);
 134
 135         return error;
 136 }
 137
 138 static int max77843_haptic_disable(struct max77843_haptic *haptic)
 139 {
 140         int error;
 141
 142         if (!haptic->active)
 143                 return 0;
 144
 145         error = max77843_haptic_config(haptic, false);
 146         if (error)
 147                 return error;
 148
 149         pwm_disable(haptic->pwm_dev);
 150
 151         haptic->active = false;
 152
 153         return 0;
 154 }
 155
 156 static void max77843_haptic_play_work(struct work_struct *work)
 157 {
 158         struct max77843_haptic *haptic =
 159                         container_of(work, struct max77843_haptic, work);
 160         int error;
 161
 162         mutex_lock(&haptic->mutex);
 163
 164         if (haptic->suspended)
 165                 goto out_unlock;
 166
 167         if (haptic->magnitude) {
 168                 error = max77843_haptic_set_duty_cycle(haptic);
 169                 if (error) {
 170                         dev_err(haptic->dev,
 171                                 "failed to set duty cycle: %d\n", error);
 172                         goto out_unlock;
 173                 }
 174
 175                 error = max77843_haptic_enable(haptic);
 176                 if (error)
 177                         dev_err(haptic->dev,
 178                                 "cannot enable haptic: %d\n", error);
 179         } else {
 180                 error = max77843_haptic_disable(haptic);
 181                 if (error)
 182                         dev_err(haptic->dev,
 183                                 "cannot disable haptic: %d\n", error);
 184         }
 185
 186 out_unlock:
 187         mutex_unlock(&haptic->mutex);
 188 }
 189
 190 static int max77843_haptic_play_effect(struct input_dev *dev, void *data,
 191                 struct ff_effect *effect)
 192 {
 193         struct max77843_haptic *haptic = input_get_drvdata(dev);
 194         u64 period_mag_multi;
 195
 196         haptic->magnitude = effect->u.rumble.strong_magnitude;
 197         if (!haptic->magnitude)
 198                 haptic->magnitude = effect->u.rumble.weak_magnitude;
 199
 200         period_mag_multi = (u64)haptic->pwm_dev->period * haptic->magnitude;
 201         haptic->pwm_duty = (unsigned int)(period_mag_multi >>
 202                                                 MAX_MAGNITUDE_SHIFT);
 203
 204         schedule_work(&haptic->work);
 205
 206         return 0;
 207 }
 208
 209 static int max77843_haptic_open(struct input_dev *dev)
 210 {
 211         struct max77843_haptic *haptic = input_get_drvdata(dev);
 212         int error;
 213
 214         error = max77843_haptic_bias(haptic, true);
 215         if (error)
 216                 return error;
 217
 218         error = regulator_enable(haptic->motor_reg);
 219         if (error) {
 220                 dev_err(haptic->dev,
 221                         "failed to enable regulator: %d\n", error);
 222                 return error;
 223         }
 224
 225         return 0;
 226 }
 227
 228 static void max77843_haptic_close(struct input_dev *dev)
 229 {
 230         struct max77843_haptic *haptic = input_get_drvdata(dev);
 231         int error;
 232
 233         cancel_work_sync(&haptic->work);
 234         max77843_haptic_disable(haptic);
 235
 236         error = regulator_disable(haptic->motor_reg);
 237         if (error)
 238                 dev_err(haptic->dev,
 239                         "failed to disable regulator: %d\n", error);
 240
 241         max77843_haptic_bias(haptic, false);
 242 }
 243
 244 static int max77843_haptic_probe(struct platform_device *pdev)
 245 {
 246         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
 247         struct max77843_haptic *haptic;
 248         int error;
 249
 250         haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
 251         if (!haptic)
 252                 return -ENOMEM;
 253
 254         haptic->regmap_haptic = max77843->regmap;
 255         haptic->dev = &pdev->dev;
 256         haptic->type = MAX77843_HAPTIC_LRA;
 257         haptic->pwm_divisor = MAX77843_HAPTIC_PWM_DIVISOR_128;
 258
 259         INIT_WORK(&haptic->work, max77843_haptic_play_work);
 260         mutex_init(&haptic->mutex);
 261
 262         haptic->pwm_dev = devm_pwm_get(&pdev->dev, NULL);
 263         if (IS_ERR(haptic->pwm_dev)) {
 264                 dev_err(&pdev->dev, "failed to get pwm device\n");
 265                 return PTR_ERR(haptic->pwm_dev);
 266         }
 267
 268         haptic->motor_reg = devm_regulator_get_exclusive(&pdev->dev, "haptic");
 269         if (IS_ERR(haptic->motor_reg)) {
 270                 dev_err(&pdev->dev, "failed to get regulator\n");
 271                 return PTR_ERR(haptic->motor_reg);
 272         }
 273
 274         haptic->input_dev = devm_input_allocate_device(&pdev->dev);
 275         if (!haptic->input_dev) {
 276                 dev_err(&pdev->dev, "failed to allocate input device\n");
 277                 return -ENOMEM;
 278         }
 279
 280         haptic->input_dev->name = "max77843-haptic";
 281         haptic->input_dev->id.version = 1;
 282         haptic->input_dev->dev.parent = &pdev->dev;
 283         haptic->input_dev->open = max77843_haptic_open;
 284         haptic->input_dev->close = max77843_haptic_close;
 285         input_set_drvdata(haptic->input_dev, haptic);
 286         input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
 287
 288         error = input_ff_create_memless(haptic->input_dev, NULL,
 289                         max77843_haptic_play_effect);
 290         if (error) {
 291                 dev_err(&pdev->dev, "failed to create force-feedback\n");
 292                 return error;
 293         }
 294
 295         error = input_register_device(haptic->input_dev);
 296         if (error) {
 297                 dev_err(&pdev->dev, "failed to register input device\n");
 298                 return error;
 299         }
 300
 301         platform_set_drvdata(pdev, haptic);
 302
 303         return 0;
 304 }
 305
 306 static int __maybe_unused max77843_haptic_suspend(struct device *dev)
 307 {
 308         struct platform_device *pdev = to_platform_device(dev);
 309         struct max77843_haptic *haptic = platform_get_drvdata(pdev);
 310         int error;
 311
 312         error = mutex_lock_interruptible(&haptic->mutex);
 313         if (error)
 314                 return error;
 315
 316         max77843_haptic_disable(haptic);
 317
 318         haptic->suspended = true;
 319
 320         mutex_unlock(&haptic->mutex);
 321
 322         return 0;
 323 }
 324
 325 static int __maybe_unused max77843_haptic_resume(struct device *dev)
 326 {
 327         struct platform_device *pdev = to_platform_device(dev);
 328         struct max77843_haptic *haptic = platform_get_drvdata(pdev);
 329         unsigned int magnitude;
 330
 331         mutex_lock(&haptic->mutex);
 332
 333         haptic->suspended = false;
 334
 335         magnitude = ACCESS_ONCE(haptic->magnitude);
 336         if (magnitude)
 337                 max77843_haptic_enable(haptic);
 338
 339         mutex_unlock(&haptic->mutex);
 340
 341         return 0;
 342 }
 343
 344 static SIMPLE_DEV_PM_OPS(max77843_haptic_pm_ops,
 345                 max77843_haptic_suspend, max77843_haptic_resume);
 346
 347 static struct platform_driver max77843_haptic_driver = {
 348         .driver         = {
 349                 .name   = "max77843-haptic",
 350                 .pm     = &max77843_haptic_pm_ops,
 351         },
 352         .probe          = max77843_haptic_probe,
 353 };
 354 module_platform_driver(max77843_haptic_driver);
 355
 356 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 357 MODULE_DESCRIPTION("MAXIM MAX77843 Haptic driver");
 358 MODULE_LICENSE("GPL");