drivers/input/misc/arizona-haptics.c

   1 /*
   2  * Arizona haptics driver
   3  *
   4  * Copyright 2012 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/input.h>
  16 #include <linux/slab.h>
  17
  18 #include <sound/soc.h>
  19 #include <sound/soc-dapm.h>
  20
  21 #include <linux/mfd/arizona/core.h>
  22 #include <linux/mfd/arizona/pdata.h>
  23 #include <linux/mfd/arizona/registers.h>
  24
  25 struct arizona_haptics {
  26         struct arizona *arizona;
  27         struct input_dev *input_dev;
  28         struct work_struct work;
  29
  30         struct mutex mutex;
  31         u8 intensity;
  32 };
  33
  34 static void arizona_haptics_work(struct work_struct *work)
  35 {
  36         struct arizona_haptics *haptics = container_of(work,
  37                                                        struct arizona_haptics,
  38                                                        work);
  39         struct arizona *arizona = haptics->arizona;
  40         struct mutex *dapm_mutex = &arizona->dapm->card->dapm_mutex;
  41         int ret;
  42
  43         if (!haptics->arizona->dapm) {
  44                 dev_err(arizona->dev, "No DAPM context\n");
  45                 return;
  46         }
  47
  48         if (haptics->intensity) {
  49                 ret = regmap_update_bits(arizona->regmap,
  50                                          ARIZONA_HAPTICS_PHASE_2_INTENSITY,
  51                                          ARIZONA_PHASE2_INTENSITY_MASK,
  52                                          haptics->intensity);
  53                 if (ret != 0) {
  54                         dev_err(arizona->dev, "Failed to set intensity: %d\n",
  55                                 ret);
  56                         return;
  57                 }
  58
  59                 /* This enable sequence will be a noop if already enabled */
  60                 ret = regmap_update_bits(arizona->regmap,
  61                                          ARIZONA_HAPTICS_CONTROL_1,
  62                                          ARIZONA_HAP_CTRL_MASK,
  63                                          1 << ARIZONA_HAP_CTRL_SHIFT);
  64                 if (ret != 0) {
  65                         dev_err(arizona->dev, "Failed to start haptics: %d\n",
  66                                 ret);
  67                         return;
  68                 }
  69
  70                 mutex_lock_nested(dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  71
  72                 ret = snd_soc_dapm_enable_pin(arizona->dapm, "HAPTICS");
  73                 if (ret != 0) {
  74                         dev_err(arizona->dev, "Failed to start HAPTICS: %d\n",
  75                                 ret);
  76                         mutex_unlock(dapm_mutex);
  77                         return;
  78                 }
  79
  80                 ret = snd_soc_dapm_sync(arizona->dapm);
  81                 if (ret != 0) {
  82                         dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
  83                                 ret);
  84                         mutex_unlock(dapm_mutex);
  85                         return;
  86                 }
  87
  88                 mutex_unlock(dapm_mutex);
  89
  90         } else {
  91                 /* This disable sequence will be a noop if already enabled */
  92                 mutex_lock_nested(dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  93
  94                 ret = snd_soc_dapm_disable_pin(arizona->dapm, "HAPTICS");
  95                 if (ret != 0) {
  96                         dev_err(arizona->dev, "Failed to disable HAPTICS: %d\n",
  97                                 ret);
  98                         mutex_unlock(dapm_mutex);
  99                         return;
 100                 }
 101
 102                 ret = snd_soc_dapm_sync(arizona->dapm);
 103                 if (ret != 0) {
 104                         dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
 105                                 ret);
 106                         mutex_unlock(dapm_mutex);
 107                         return;
 108                 }
 109
 110                 mutex_unlock(dapm_mutex);
 111
 112                 ret = regmap_update_bits(arizona->regmap,
 113                                          ARIZONA_HAPTICS_CONTROL_1,
 114                                          ARIZONA_HAP_CTRL_MASK,
 115                                          1 << ARIZONA_HAP_CTRL_SHIFT);
 116                 if (ret != 0) {
 117                         dev_err(arizona->dev, "Failed to stop haptics: %d\n",
 118                                 ret);
 119                         return;
 120                 }
 121         }
 122 }
 123
 124 static int arizona_haptics_play(struct input_dev *input, void *data,
 125                                 struct ff_effect *effect)
 126 {
 127         struct arizona_haptics *haptics = input_get_drvdata(input);
 128         struct arizona *arizona = haptics->arizona;
 129
 130         if (!arizona->dapm) {
 131                 dev_err(arizona->dev, "No DAPM context\n");
 132                 return -EBUSY;
 133         }
 134
 135         if (effect->u.rumble.strong_magnitude) {
 136                 /* Scale the magnitude into the range the device supports */
 137                 if (arizona->pdata.hap_act) {
 138                         haptics->intensity =
 139                                 effect->u.rumble.strong_magnitude >> 9;
 140                         if (effect->direction < 0x8000)
 141                                 haptics->intensity += 0x7f;
 142                 } else {
 143                         haptics->intensity =
 144                                 effect->u.rumble.strong_magnitude >> 8;
 145                 }
 146         } else {
 147                 haptics->intensity = 0;
 148         }
 149
 150         schedule_work(&haptics->work);
 151
 152         return 0;
 153 }
 154
 155 static void arizona_haptics_close(struct input_dev *input)
 156 {
 157         struct arizona_haptics *haptics = input_get_drvdata(input);
 158         struct mutex *dapm_mutex = &haptics->arizona->dapm->card->dapm_mutex;
 159
 160         cancel_work_sync(&haptics->work);
 161
 162         mutex_lock_nested(dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
 163
 164         if (haptics->arizona->dapm)
 165                 snd_soc_dapm_disable_pin(haptics->arizona->dapm, "HAPTICS");
 166
 167         mutex_unlock(dapm_mutex);
 168 }
 169
 170 static int arizona_haptics_probe(struct platform_device *pdev)
 171 {
 172         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 173         struct arizona_haptics *haptics;
 174         int ret;
 175
 176         haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
 177         if (!haptics)
 178                 return -ENOMEM;
 179
 180         haptics->arizona = arizona;
 181
 182         ret = regmap_update_bits(arizona->regmap, ARIZONA_HAPTICS_CONTROL_1,
 183                                  ARIZONA_HAP_ACT, arizona->pdata.hap_act);
 184         if (ret != 0) {
 185                 dev_err(arizona->dev, "Failed to set haptics actuator: %d\n",
 186                         ret);
 187                 return ret;
 188         }
 189
 190         INIT_WORK(&haptics->work, arizona_haptics_work);
 191
 192         haptics->input_dev = input_allocate_device();
 193         if (haptics->input_dev == NULL) {
 194                 dev_err(arizona->dev, "Failed to allocate input device\n");
 195                 return -ENOMEM;
 196         }
 197
 198         input_set_drvdata(haptics->input_dev, haptics);
 199
 200         haptics->input_dev->name = "arizona:haptics";
 201         haptics->input_dev->dev.parent = pdev->dev.parent;
 202         haptics->input_dev->close = arizona_haptics_close;
 203         __set_bit(FF_RUMBLE, haptics->input_dev->ffbit);
 204
 205         ret = input_ff_create_memless(haptics->input_dev, NULL,
 206                                       arizona_haptics_play);
 207         if (ret < 0) {
 208                 dev_err(arizona->dev, "input_ff_create_memless() failed: %d\n",
 209                         ret);
 210                 goto err_ialloc;
 211         }
 212
 213         ret = input_register_device(haptics->input_dev);
 214         if (ret < 0) {
 215                 dev_err(arizona->dev, "couldn't register input device: %d\n",
 216                         ret);
 217                 goto err_iff;
 218         }
 219
 220         platform_set_drvdata(pdev, haptics);
 221
 222         return 0;
 223
 224 err_iff:
 225         if (haptics->input_dev)
 226                 input_ff_destroy(haptics->input_dev);
 227 err_ialloc:
 228         input_free_device(haptics->input_dev);
 229
 230         return ret;
 231 }
 232
 233 static int arizona_haptics_remove(struct platform_device *pdev)
 234 {
 235         struct arizona_haptics *haptics = platform_get_drvdata(pdev);
 236
 237         input_unregister_device(haptics->input_dev);
 238
 239         return 0;
 240 }
 241
 242 static struct platform_driver arizona_haptics_driver = {
 243         .probe          = arizona_haptics_probe,
 244         .remove         = arizona_haptics_remove,
 245         .driver         = {
 246                 .name   = "arizona-haptics",
 247                 .owner  = THIS_MODULE,
 248         },
 249 };
 250 module_platform_driver(arizona_haptics_driver);
 251
 252 MODULE_ALIAS("platform:arizona-haptics");
 253 MODULE_DESCRIPTION("Arizona haptics driver");
 254 MODULE_LICENSE("GPL");
 255 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");