drivers/input/misc/twl6040-vibra.c

   1 /*
   2  * twl6040-vibra.c - TWL6040 Vibrator driver
   3  *
   4  * Author:      Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
   5  * Author:      Misael Lopez Cruz <misael.lopez@ti.com>
   6  *
   7  * Copyright:   (C) 2011 Texas Instruments, Inc.
   8  *
   9  * Based on twl4030-vibra.c by Henrik Saari <henrik.saari@nokia.com>
  10  *                              Felipe Balbi <felipe.balbi@nokia.com>
  11  *                              Jari Vanhala <ext-javi.vanhala@nokia.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  25  * 02110-1301 USA
  26  *
  27  */
  28 #include <linux/module.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/of.h>
  31 #include <linux/workqueue.h>
  32 #include <linux/input.h>
  33 #include <linux/mfd/twl6040.h>
  34 #include <linux/slab.h>
  35 #include <linux/delay.h>
  36 #include <linux/regulator/consumer.h>
  37
  38 #define EFFECT_DIR_180_DEG      0x8000
  39
  40 /* Recommended modulation index 85% */
  41 #define TWL6040_VIBRA_MOD       85
  42
  43 #define TWL6040_NUM_SUPPLIES 2
  44
  45 struct vibra_info {
  46         struct device *dev;
  47         struct input_dev *input_dev;
  48         struct workqueue_struct *workqueue;
  49         struct work_struct play_work;
  50         struct mutex mutex;
  51         int irq;
  52
  53         bool enabled;
  54         int weak_speed;
  55         int strong_speed;
  56         int direction;
  57
  58         unsigned int vibldrv_res;
  59         unsigned int vibrdrv_res;
  60         unsigned int viblmotor_res;
  61         unsigned int vibrmotor_res;
  62
  63         struct regulator_bulk_data supplies[TWL6040_NUM_SUPPLIES];
  64
  65         struct twl6040 *twl6040;
  66 };
  67
  68 static irqreturn_t twl6040_vib_irq_handler(int irq, void *data)
  69 {
  70         struct vibra_info *info = data;
  71         struct twl6040 *twl6040 = info->twl6040;
  72         u8 status;
  73
  74         status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
  75         if (status & TWL6040_VIBLOCDET) {
  76                 dev_warn(info->dev, "Left Vibrator overcurrent detected\n");
  77                 twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLL,
  78                                    TWL6040_VIBENA);
  79         }
  80         if (status & TWL6040_VIBROCDET) {
  81                 dev_warn(info->dev, "Right Vibrator overcurrent detected\n");
  82                 twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLR,
  83                                    TWL6040_VIBENA);
  84         }
  85
  86         return IRQ_HANDLED;
  87 }
  88
  89 static void twl6040_vibra_enable(struct vibra_info *info)
  90 {
  91         struct twl6040 *twl6040 = info->twl6040;
  92         int ret;
  93
  94         ret = regulator_bulk_enable(ARRAY_SIZE(info->supplies), info->supplies);
  95         if (ret) {
  96                 dev_err(info->dev, "failed to enable regulators %d\n", ret);
  97                 return;
  98         }
  99
 100         twl6040_power(info->twl6040, 1);
 101         if (twl6040_get_revid(twl6040) <= TWL6040_REV_ES1_1) {
 102                 /*
 103                  * ERRATA: Disable overcurrent protection for at least
 104                  * 3ms when enabling vibrator drivers to avoid false
 105                  * overcurrent detection
 106                  */
 107                 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL,
 108                                   TWL6040_VIBENA | TWL6040_VIBCTRL);
 109                 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR,
 110                                   TWL6040_VIBENA | TWL6040_VIBCTRL);
 111                 usleep_range(3000, 3500);
 112         }
 113
 114         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL,
 115                           TWL6040_VIBENA);
 116         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR,
 117                           TWL6040_VIBENA);
 118
 119         info->enabled = true;
 120 }
 121
 122 static void twl6040_vibra_disable(struct vibra_info *info)
 123 {
 124         struct twl6040 *twl6040 = info->twl6040;
 125
 126         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL, 0x00);
 127         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR, 0x00);
 128         twl6040_power(info->twl6040, 0);
 129
 130         regulator_bulk_disable(ARRAY_SIZE(info->supplies), info->supplies);
 131
 132         info->enabled = false;
 133 }
 134
 135 static u8 twl6040_vibra_code(int vddvib, int vibdrv_res, int motor_res,
 136                              int speed, int direction)
 137 {
 138         int vpk, max_code;
 139         u8 vibdat;
 140
 141         /* output swing */
 142         vpk = (vddvib * motor_res * TWL6040_VIBRA_MOD) /
 143                 (100 * (vibdrv_res + motor_res));
 144
 145         /* 50mV per VIBDAT code step */
 146         max_code = vpk / 50;
 147         if (max_code > TWL6040_VIBDAT_MAX)
 148                 max_code = TWL6040_VIBDAT_MAX;
 149
 150         /* scale speed to max allowed code */
 151         vibdat = (u8)((speed * max_code) / USHRT_MAX);
 152
 153         /* 2's complement for direction > 180 degrees */
 154         vibdat *= direction;
 155
 156         return vibdat;
 157 }
 158
 159 static void twl6040_vibra_set_effect(struct vibra_info *info)
 160 {
 161         struct twl6040 *twl6040 = info->twl6040;
 162         u8 vibdatl, vibdatr;
 163         int volt;
 164
 165         /* weak motor */
 166         volt = regulator_get_voltage(info->supplies[0].consumer) / 1000;
 167         vibdatl = twl6040_vibra_code(volt, info->vibldrv_res,
 168                                      info->viblmotor_res,
 169                                      info->weak_speed, info->direction);
 170
 171         /* strong motor */
 172         volt = regulator_get_voltage(info->supplies[1].consumer) / 1000;
 173         vibdatr = twl6040_vibra_code(volt, info->vibrdrv_res,
 174                                      info->vibrmotor_res,
 175                                      info->strong_speed, info->direction);
 176
 177         twl6040_reg_write(twl6040, TWL6040_REG_VIBDATL, vibdatl);
 178         twl6040_reg_write(twl6040, TWL6040_REG_VIBDATR, vibdatr);
 179 }
 180
 181 static void vibra_play_work(struct work_struct *work)
 182 {
 183         struct vibra_info *info = container_of(work,
 184                                 struct vibra_info, play_work);
 185
 186         mutex_lock(&info->mutex);
 187
 188         if (info->weak_speed || info->strong_speed) {
 189                 if (!info->enabled)
 190                         twl6040_vibra_enable(info);
 191
 192                 twl6040_vibra_set_effect(info);
 193         } else if (info->enabled)
 194                 twl6040_vibra_disable(info);
 195
 196         mutex_unlock(&info->mutex);
 197 }
 198
 199 static int vibra_play(struct input_dev *input, void *data,
 200                       struct ff_effect *effect)
 201 {
 202         struct vibra_info *info = input_get_drvdata(input);
 203         int ret;
 204
 205         /* Do not allow effect, while the routing is set to use audio */
 206         ret = twl6040_get_vibralr_status(info->twl6040);
 207         if (ret & TWL6040_VIBSEL) {
 208                 dev_info(&input->dev, "Vibra is configured for audio\n");
 209                 return -EBUSY;
 210         }
 211
 212         info->weak_speed = effect->u.rumble.weak_magnitude;
 213         info->strong_speed = effect->u.rumble.strong_magnitude;
 214         info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1;
 215
 216         ret = queue_work(info->workqueue, &info->play_work);
 217         if (!ret) {
 218                 dev_info(&input->dev, "work is already on queue\n");
 219                 return ret;
 220         }
 221
 222         return 0;
 223 }
 224
 225 static void twl6040_vibra_close(struct input_dev *input)
 226 {
 227         struct vibra_info *info = input_get_drvdata(input);
 228
 229         cancel_work_sync(&info->play_work);
 230
 231         mutex_lock(&info->mutex);
 232
 233         if (info->enabled)
 234                 twl6040_vibra_disable(info);
 235
 236         mutex_unlock(&info->mutex);
 237 }
 238
 239 static int __maybe_unused twl6040_vibra_suspend(struct device *dev)
 240 {
 241         struct platform_device *pdev = to_platform_device(dev);
 242         struct vibra_info *info = platform_get_drvdata(pdev);
 243
 244         mutex_lock(&info->mutex);
 245
 246         if (info->enabled)
 247                 twl6040_vibra_disable(info);
 248
 249         mutex_unlock(&info->mutex);
 250
 251         return 0;
 252 }
 253
 254 static SIMPLE_DEV_PM_OPS(twl6040_vibra_pm_ops, twl6040_vibra_suspend, NULL);
 255
 256 static int twl6040_vibra_probe(struct platform_device *pdev)
 257 {
 258         struct device *twl6040_core_dev = pdev->dev.parent;
 259         struct device_node *twl6040_core_node;
 260         struct vibra_info *info;
 261         int vddvibl_uV = 0;
 262         int vddvibr_uV = 0;
 263         int error;
 264
 265         twl6040_core_node = of_find_node_by_name(twl6040_core_dev->of_node,
 266                                                  "vibra");
 267         if (!twl6040_core_node) {
 268                 dev_err(&pdev->dev, "parent of node is missing?\n");
 269                 return -EINVAL;
 270         }
 271
 272         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 273         if (!info) {
 274                 of_node_put(twl6040_core_node);
 275                 dev_err(&pdev->dev, "couldn't allocate memory\n");
 276                 return -ENOMEM;
 277         }
 278
 279         info->dev = &pdev->dev;
 280
 281         info->twl6040 = dev_get_drvdata(pdev->dev.parent);
 282
 283         of_property_read_u32(twl6040_core_node, "ti,vibldrv-res",
 284                              &info->vibldrv_res);
 285         of_property_read_u32(twl6040_core_node, "ti,vibrdrv-res",
 286                              &info->vibrdrv_res);
 287         of_property_read_u32(twl6040_core_node, "ti,viblmotor-res",
 288                              &info->viblmotor_res);
 289         of_property_read_u32(twl6040_core_node, "ti,vibrmotor-res",
 290                              &info->vibrmotor_res);
 291         of_property_read_u32(twl6040_core_node, "ti,vddvibl-uV", &vddvibl_uV);
 292         of_property_read_u32(twl6040_core_node, "ti,vddvibr-uV", &vddvibr_uV);
 293
 294         of_node_put(twl6040_core_node);
 295
 296         if ((!info->vibldrv_res && !info->viblmotor_res) ||
 297             (!info->vibrdrv_res && !info->vibrmotor_res)) {
 298                 dev_err(info->dev, "invalid vibra driver/motor resistance\n");
 299                 return -EINVAL;
 300         }
 301
 302         info->irq = platform_get_irq(pdev, 0);
 303         if (info->irq < 0) {
 304                 dev_err(info->dev, "invalid irq\n");
 305                 return -EINVAL;
 306         }
 307
 308         mutex_init(&info->mutex);
 309
 310         error = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 311                                           twl6040_vib_irq_handler, 0,
 312                                           "twl6040_irq_vib", info);
 313         if (error) {
 314                 dev_err(info->dev, "VIB IRQ request failed: %d\n", error);
 315                 return error;
 316         }
 317
 318         info->supplies[0].supply = "vddvibl";
 319         info->supplies[1].supply = "vddvibr";
 320         /*
 321          * When booted with Device tree the regulators are attached to the
 322          * parent device (twl6040 MFD core)
 323          */
 324         error = devm_regulator_bulk_get(twl6040_core_dev,
 325                                         ARRAY_SIZE(info->supplies),
 326                                         info->supplies);
 327         if (error) {
 328                 dev_err(info->dev, "couldn't get regulators %d\n", error);
 329                 return error;
 330         }
 331
 332         if (vddvibl_uV) {
 333                 error = regulator_set_voltage(info->supplies[0].consumer,
 334                                               vddvibl_uV, vddvibl_uV);
 335                 if (error) {
 336                         dev_err(info->dev, "failed to set VDDVIBL volt %d\n",
 337                                 error);
 338                         return error;
 339                 }
 340         }
 341
 342         if (vddvibr_uV) {
 343                 error = regulator_set_voltage(info->supplies[1].consumer,
 344                                               vddvibr_uV, vddvibr_uV);
 345                 if (error) {
 346                         dev_err(info->dev, "failed to set VDDVIBR volt %d\n",
 347                                 error);
 348                         return error;
 349                 }
 350         }
 351
 352         INIT_WORK(&info->play_work, vibra_play_work);
 353
 354         info->input_dev = devm_input_allocate_device(&pdev->dev);
 355         if (!info->input_dev) {
 356                 dev_err(info->dev, "couldn't allocate input device\n");
 357                 return -ENOMEM;
 358         }
 359
 360         input_set_drvdata(info->input_dev, info);
 361
 362         info->input_dev->name = "twl6040:vibrator";
 363         info->input_dev->id.version = 1;
 364         info->input_dev->dev.parent = pdev->dev.parent;
 365         info->input_dev->close = twl6040_vibra_close;
 366         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
 367
 368         error = input_ff_create_memless(info->input_dev, NULL, vibra_play);
 369         if (error) {
 370                 dev_err(info->dev, "couldn't register vibrator to FF\n");
 371                 return error;
 372         }
 373
 374         error = input_register_device(info->input_dev);
 375         if (error) {
 376                 dev_err(info->dev, "couldn't register input device\n");
 377                 return error;
 378         }
 379
 380         platform_set_drvdata(pdev, info);
 381
 382         return 0;
 383 }
 384
 385 static struct platform_driver twl6040_vibra_driver = {
 386         .probe          = twl6040_vibra_probe,
 387         .driver         = {
 388                 .name   = "twl6040-vibra",
 389                 .pm     = &twl6040_vibra_pm_ops,
 390         },
 391 };
 392 module_platform_driver(twl6040_vibra_driver);
 393
 394 MODULE_ALIAS("platform:twl6040-vibra");
 395 MODULE_DESCRIPTION("TWL6040 Vibra driver");
 396 MODULE_LICENSE("GPL");
 397 MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
 398 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");