drivers/input/misc/max8997_haptic.c

   1 /*
   2  * MAX8997-haptic controller driver
   3  *
   4  * Copyright (C) 2012 Samsung Electronics
   5  * Donggeun Kim <dg77.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  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/err.h>
  29 #include <linux/pwm.h>
  30 #include <linux/input.h>
  31 #include <linux/mfd/max8997-private.h>
  32 #include <linux/mfd/max8997.h>
  33 #include <linux/regulator/consumer.h>
  34
  35 /* Haptic configuration 2 register */
  36 #define MAX8997_MOTOR_TYPE_SHIFT        7
  37 #define MAX8997_ENABLE_SHIFT            6
  38 #define MAX8997_MODE_SHIFT              5
  39
  40 /* Haptic driver configuration register */
  41 #define MAX8997_CYCLE_SHIFT             6
  42 #define MAX8997_SIG_PERIOD_SHIFT        4
  43 #define MAX8997_SIG_DUTY_SHIFT          2
  44 #define MAX8997_PWM_DUTY_SHIFT          0
  45
  46 struct max8997_haptic {
  47         struct device *dev;
  48         struct i2c_client *client;
  49         struct input_dev *input_dev;
  50         struct regulator *regulator;
  51
  52         struct work_struct work;
  53         struct mutex mutex;
  54
  55         bool enabled;
  56         unsigned int level;
  57
  58         struct pwm_device *pwm;
  59         unsigned int pwm_period;
  60         enum max8997_haptic_pwm_divisor pwm_divisor;
  61
  62         enum max8997_haptic_motor_type type;
  63         enum max8997_haptic_pulse_mode mode;
  64
  65         unsigned int internal_mode_pattern;
  66         unsigned int pattern_cycle;
  67         unsigned int pattern_signal_period;
  68 };
  69
  70 static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
  71 {
  72         int ret = 0;
  73
  74         if (chip->mode == MAX8997_EXTERNAL_MODE) {
  75                 unsigned int duty = chip->pwm_period * chip->level / 100;
  76                 ret = pwm_config(chip->pwm, duty, chip->pwm_period);
  77         } else {
  78                 int i;
  79                 u8 duty_index = 0;
  80
  81                 for (i = 0; i <= 64; i++) {
  82                         if (chip->level <= i * 100 / 64) {
  83                                 duty_index = i;
  84                                 break;
  85                         }
  86                 }
  87                 switch (chip->internal_mode_pattern) {
  88                 case 0:
  89                         max8997_write_reg(chip->client,
  90                                 MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
  91                         break;
  92                 case 1:
  93                         max8997_write_reg(chip->client,
  94                                 MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
  95                         break;
  96                 case 2:
  97                         max8997_write_reg(chip->client,
  98                                 MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
  99                         break;
 100                 case 3:
 101                         max8997_write_reg(chip->client,
 102                                 MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
 103                         break;
 104                 default:
 105                         break;
 106                 }
 107         }
 108         return ret;
 109 }
 110
 111 static void max8997_haptic_configure(struct max8997_haptic *chip)
 112 {
 113         u8 value;
 114
 115         value = chip->type << MAX8997_MOTOR_TYPE_SHIFT |
 116                 chip->enabled << MAX8997_ENABLE_SHIFT |
 117                 chip->mode << MAX8997_MODE_SHIFT | chip->pwm_divisor;
 118         max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);
 119
 120         if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
 121                 value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT |
 122                         chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT |
 123                         chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT |
 124                         chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
 125                 max8997_write_reg(chip->client,
 126                         MAX8997_HAPTIC_REG_DRVCONF, value);
 127
 128                 switch (chip->internal_mode_pattern) {
 129                 case 0:
 130                         value = chip->pattern_cycle << 4;
 131                         max8997_write_reg(chip->client,
 132                                 MAX8997_HAPTIC_REG_CYCLECONF1, value);
 133                         value = chip->pattern_signal_period;
 134                         max8997_write_reg(chip->client,
 135                                 MAX8997_HAPTIC_REG_SIGCONF1, value);
 136                         break;
 137
 138                 case 1:
 139                         value = chip->pattern_cycle;
 140                         max8997_write_reg(chip->client,
 141                                 MAX8997_HAPTIC_REG_CYCLECONF1, value);
 142                         value = chip->pattern_signal_period;
 143                         max8997_write_reg(chip->client,
 144                                 MAX8997_HAPTIC_REG_SIGCONF2, value);
 145                         break;
 146
 147                 case 2:
 148                         value = chip->pattern_cycle << 4;
 149                         max8997_write_reg(chip->client,
 150                                 MAX8997_HAPTIC_REG_CYCLECONF2, value);
 151                         value = chip->pattern_signal_period;
 152                         max8997_write_reg(chip->client,
 153                                 MAX8997_HAPTIC_REG_SIGCONF3, value);
 154                         break;
 155
 156                 case 3:
 157                         value = chip->pattern_cycle;
 158                         max8997_write_reg(chip->client,
 159                                 MAX8997_HAPTIC_REG_CYCLECONF2, value);
 160                         value = chip->pattern_signal_period;
 161                         max8997_write_reg(chip->client,
 162                                 MAX8997_HAPTIC_REG_SIGCONF4, value);
 163                         break;
 164
 165                 default:
 166                         break;
 167                 }
 168         }
 169 }
 170
 171 static void max8997_haptic_enable(struct max8997_haptic *chip)
 172 {
 173         int error;
 174
 175         mutex_lock(&chip->mutex);
 176
 177         error = max8997_haptic_set_duty_cycle(chip);
 178         if (error) {
 179                 dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
 180                 goto out;
 181         }
 182
 183         if (!chip->enabled) {
 184                 error = regulator_enable(chip->regulator);
 185                 if (error) {
 186                         dev_err(chip->dev, "Failed to enable regulator\n");
 187                         goto out;
 188                 }
 189                 max8997_haptic_configure(chip);
 190                 if (chip->mode == MAX8997_EXTERNAL_MODE) {
 191                         error = pwm_enable(chip->pwm);
 192                         if (error) {
 193                                 dev_err(chip->dev, "Failed to enable PWM\n");
 194                                 regulator_disable(chip->regulator);
 195                                 goto out;
 196                         }
 197                 }
 198                 chip->enabled = true;
 199         }
 200
 201 out:
 202         mutex_unlock(&chip->mutex);
 203 }
 204
 205 static void max8997_haptic_disable(struct max8997_haptic *chip)
 206 {
 207         mutex_lock(&chip->mutex);
 208
 209         if (chip->enabled) {
 210                 chip->enabled = false;
 211                 max8997_haptic_configure(chip);
 212                 if (chip->mode == MAX8997_EXTERNAL_MODE)
 213                         pwm_disable(chip->pwm);
 214                 regulator_disable(chip->regulator);
 215         }
 216
 217         mutex_unlock(&chip->mutex);
 218 }
 219
 220 static void max8997_haptic_play_effect_work(struct work_struct *work)
 221 {
 222         struct max8997_haptic *chip =
 223                         container_of(work, struct max8997_haptic, work);
 224
 225         if (chip->level)
 226                 max8997_haptic_enable(chip);
 227         else
 228                 max8997_haptic_disable(chip);
 229 }
 230
 231 static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
 232                                   struct ff_effect *effect)
 233 {
 234         struct max8997_haptic *chip = input_get_drvdata(dev);
 235
 236         chip->level = effect->u.rumble.strong_magnitude;
 237         if (!chip->level)
 238                 chip->level = effect->u.rumble.weak_magnitude;
 239
 240         schedule_work(&chip->work);
 241
 242         return 0;
 243 }
 244
 245 static void max8997_haptic_close(struct input_dev *dev)
 246 {
 247         struct max8997_haptic *chip = input_get_drvdata(dev);
 248
 249         cancel_work_sync(&chip->work);
 250         max8997_haptic_disable(chip);
 251 }
 252
 253 static int max8997_haptic_probe(struct platform_device *pdev)
 254 {
 255         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 256         const struct max8997_platform_data *pdata =
 257                                         dev_get_platdata(iodev->dev);
 258         const struct max8997_haptic_platform_data *haptic_pdata = NULL;
 259         struct max8997_haptic *chip;
 260         struct input_dev *input_dev;
 261         int error;
 262
 263         if (pdata)
 264                 haptic_pdata = pdata->haptic_pdata;
 265
 266         if (!haptic_pdata) {
 267                 dev_err(&pdev->dev, "no haptic platform data\n");
 268                 return -EINVAL;
 269         }
 270
 271         chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
 272         input_dev = input_allocate_device();
 273         if (!chip || !input_dev) {
 274                 dev_err(&pdev->dev, "unable to allocate memory\n");
 275                 error = -ENOMEM;
 276                 goto err_free_mem;
 277         }
 278
 279         INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
 280         mutex_init(&chip->mutex);
 281
 282         chip->client = iodev->haptic;
 283         chip->dev = &pdev->dev;
 284         chip->input_dev = input_dev;
 285         chip->pwm_period = haptic_pdata->pwm_period;
 286         chip->type = haptic_pdata->type;
 287         chip->mode = haptic_pdata->mode;
 288         chip->pwm_divisor = haptic_pdata->pwm_divisor;
 289
 290         switch (chip->mode) {
 291         case MAX8997_INTERNAL_MODE:
 292                 chip->internal_mode_pattern =
 293                                 haptic_pdata->internal_mode_pattern;
 294                 chip->pattern_cycle = haptic_pdata->pattern_cycle;
 295                 chip->pattern_signal_period =
 296                                 haptic_pdata->pattern_signal_period;
 297                 break;
 298
 299         case MAX8997_EXTERNAL_MODE:
 300                 chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
 301                                         "max8997-haptic");
 302                 if (IS_ERR(chip->pwm)) {
 303                         error = PTR_ERR(chip->pwm);
 304                         dev_err(&pdev->dev,
 305                                 "unable to request PWM for haptic, error: %d\n",
 306                                 error);
 307                         goto err_free_mem;
 308                 }
 309
 310                 /*
 311                  * FIXME: pwm_apply_args() should be removed when switching to
 312                  * the atomic PWM API.
 313                  */
 314                 pwm_apply_args(chip->pwm);
 315                 break;
 316
 317         default:
 318                 dev_err(&pdev->dev,
 319                         "Invalid chip mode specified (%d)\n", chip->mode);
 320                 error = -EINVAL;
 321                 goto err_free_mem;
 322         }
 323
 324         chip->regulator = regulator_get(&pdev->dev, "inmotor");
 325         if (IS_ERR(chip->regulator)) {
 326                 error = PTR_ERR(chip->regulator);
 327                 dev_err(&pdev->dev,
 328                         "unable to get regulator, error: %d\n",
 329                         error);
 330                 goto err_free_pwm;
 331         }
 332
 333         input_dev->name = "max8997-haptic";
 334         input_dev->id.version = 1;
 335         input_dev->dev.parent = &pdev->dev;
 336         input_dev->close = max8997_haptic_close;
 337         input_set_drvdata(input_dev, chip);
 338         input_set_capability(input_dev, EV_FF, FF_RUMBLE);
 339
 340         error = input_ff_create_memless(input_dev, NULL,
 341                                 max8997_haptic_play_effect);
 342         if (error) {
 343                 dev_err(&pdev->dev,
 344                         "unable to create FF device, error: %d\n",
 345                         error);
 346                 goto err_put_regulator;
 347         }
 348
 349         error = input_register_device(input_dev);
 350         if (error) {
 351                 dev_err(&pdev->dev,
 352                         "unable to register input device, error: %d\n",
 353                         error);
 354                 goto err_destroy_ff;
 355         }
 356
 357         platform_set_drvdata(pdev, chip);
 358         return 0;
 359
 360 err_destroy_ff:
 361         input_ff_destroy(input_dev);
 362 err_put_regulator:
 363         regulator_put(chip->regulator);
 364 err_free_pwm:
 365         if (chip->mode == MAX8997_EXTERNAL_MODE)
 366                 pwm_free(chip->pwm);
 367 err_free_mem:
 368         input_free_device(input_dev);
 369         kfree(chip);
 370
 371         return error;
 372 }
 373
 374 static int max8997_haptic_remove(struct platform_device *pdev)
 375 {
 376         struct max8997_haptic *chip = platform_get_drvdata(pdev);
 377
 378         input_unregister_device(chip->input_dev);
 379         regulator_put(chip->regulator);
 380
 381         if (chip->mode == MAX8997_EXTERNAL_MODE)
 382                 pwm_free(chip->pwm);
 383
 384         kfree(chip);
 385
 386         return 0;
 387 }
 388
 389 static int __maybe_unused max8997_haptic_suspend(struct device *dev)
 390 {
 391         struct platform_device *pdev = to_platform_device(dev);
 392         struct max8997_haptic *chip = platform_get_drvdata(pdev);
 393
 394         max8997_haptic_disable(chip);
 395
 396         return 0;
 397 }
 398
 399 static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL);
 400
 401 static const struct platform_device_id max8997_haptic_id[] = {
 402         { "max8997-haptic", 0 },
 403         { },
 404 };
 405 MODULE_DEVICE_TABLE(platform, max8997_haptic_id);
 406
 407 static struct platform_driver max8997_haptic_driver = {
 408         .driver = {
 409                 .name   = "max8997-haptic",
 410                 .pm     = &max8997_haptic_pm_ops,
 411         },
 412         .probe          = max8997_haptic_probe,
 413         .remove         = max8997_haptic_remove,
 414         .id_table       = max8997_haptic_id,
 415 };
 416 module_platform_driver(max8997_haptic_driver);
 417
 418 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 419 MODULE_DESCRIPTION("max8997_haptic driver");
 420 MODULE_LICENSE("GPL");