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                 mutex_unlock(dapm_mutex);
  81
  82                 ret = snd_soc_dapm_sync(arizona->dapm);
  83                 if (ret != 0) {
  84                         dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
  85                                 ret);
  86                         return;
  87                 }
  88         } else {
  89                 /* This disable sequence will be a noop if already enabled */
  90                 mutex_lock_nested(dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  91
  92                 ret = snd_soc_dapm_disable_pin(arizona->dapm, "HAPTICS");
  93                 if (ret != 0) {
  94                         dev_err(arizona->dev, "Failed to disable HAPTICS: %d\n",
  95                                 ret);
  96                         mutex_unlock(dapm_mutex);
  97                         return;
  98                 }
  99
 100                 mutex_unlock(dapm_mutex);
 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                         return;
 107                 }
 108
 109                 ret = regmap_update_bits(arizona->regmap,
 110                                          ARIZONA_HAPTICS_CONTROL_1,
 111                                          ARIZONA_HAP_CTRL_MASK,
 112                                          1 << ARIZONA_HAP_CTRL_SHIFT);
 113                 if (ret != 0) {
 114                         dev_err(arizona->dev, "Failed to stop haptics: %d\n",
 115                                 ret);
 116                         return;
 117                 }
 118         }
 119 }
 120
 121 static int arizona_haptics_play(struct input_dev *input, void *data,
 122                                 struct ff_effect *effect)
 123 {
 124         struct arizona_haptics *haptics = input_get_drvdata(input);
 125         struct arizona *arizona = haptics->arizona;
 126
 127         if (!arizona->dapm) {
 128                 dev_err(arizona->dev, "No DAPM context\n");
 129                 return -EBUSY;
 130         }
 131
 132         if (effect->u.rumble.strong_magnitude) {
 133                 /* Scale the magnitude into the range the device supports */
 134                 if (arizona->pdata.hap_act) {
 135                         haptics->intensity =
 136                                 effect->u.rumble.strong_magnitude >> 9;
 137                         if (effect->direction < 0x8000)
 138                                 haptics->intensity += 0x7f;
 139                 } else {
 140                         haptics->intensity =
 141                                 effect->u.rumble.strong_magnitude >> 8;
 142                 }
 143         } else {
 144                 haptics->intensity = 0;
 145         }
 146
 147         schedule_work(&haptics->work);
 148
 149         return 0;
 150 }
 151
 152 static void arizona_haptics_close(struct input_dev *input)
 153 {
 154         struct arizona_haptics *haptics = input_get_drvdata(input);
 155         struct mutex *dapm_mutex = &haptics->arizona->dapm->card->dapm_mutex;
 156
 157         cancel_work_sync(&haptics->work);
 158
 159         mutex_lock_nested(dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
 160
 161         if (haptics->arizona->dapm)
 162                 snd_soc_dapm_disable_pin(haptics->arizona->dapm, "HAPTICS");
 163
 164         mutex_unlock(dapm_mutex);
 165 }
 166
 167 static int arizona_haptics_probe(struct platform_device *pdev)
 168 {
 169         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 170         struct arizona_haptics *haptics;
 171         int ret;
 172
 173         haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
 174         if (!haptics)
 175                 return -ENOMEM;
 176
 177         haptics->arizona = arizona;
 178
 179         ret = regmap_update_bits(arizona->regmap, ARIZONA_HAPTICS_CONTROL_1,
 180                                  ARIZONA_HAP_ACT, arizona->pdata.hap_act);
 181         if (ret != 0) {
 182                 dev_err(arizona->dev, "Failed to set haptics actuator: %d\n",
 183                         ret);
 184                 return ret;
 185         }
 186
 187         INIT_WORK(&haptics->work, arizona_haptics_work);
 188
 189         haptics->input_dev = input_allocate_device();
 190         if (haptics->input_dev == NULL) {
 191                 dev_err(arizona->dev, "Failed to allocate input device\n");
 192                 return -ENOMEM;
 193         }
 194
 195         input_set_drvdata(haptics->input_dev, haptics);
 196
 197         haptics->input_dev->name = "arizona:haptics";
 198         haptics->input_dev->dev.parent = pdev->dev.parent;
 199         haptics->input_dev->close = arizona_haptics_close;
 200         __set_bit(FF_RUMBLE, haptics->input_dev->ffbit);
 201
 202         ret = input_ff_create_memless(haptics->input_dev, NULL,
 203                                       arizona_haptics_play);
 204         if (ret < 0) {
 205                 dev_err(arizona->dev, "input_ff_create_memless() failed: %d\n",
 206                         ret);
 207                 goto err_ialloc;
 208         }
 209
 210         ret = input_register_device(haptics->input_dev);
 211         if (ret < 0) {
 212                 dev_err(arizona->dev, "couldn't register input device: %d\n",
 213                         ret);
 214                 goto err_iff;
 215         }
 216
 217         platform_set_drvdata(pdev, haptics);
 218
 219         return 0;
 220
 221 err_iff:
 222         if (haptics->input_dev)
 223                 input_ff_destroy(haptics->input_dev);
 224 err_ialloc:
 225         input_free_device(haptics->input_dev);
 226
 227         return ret;
 228 }
 229
 230 static int arizona_haptics_remove(struct platform_device *pdev)
 231 {
 232         struct arizona_haptics *haptics = platform_get_drvdata(pdev);
 233
 234         input_unregister_device(haptics->input_dev);
 235
 236         return 0;
 237 }
 238
 239 static struct platform_driver arizona_haptics_driver = {
 240         .probe          = arizona_haptics_probe,
 241         .remove         = arizona_haptics_remove,
 242         .driver         = {
 243                 .name   = "arizona-haptics",
 244                 .owner  = THIS_MODULE,
 245         },
 246 };
 247 module_platform_driver(arizona_haptics_driver);
 248
 249 MODULE_ALIAS("platform:arizona-haptics");
 250 MODULE_DESCRIPTION("Arizona haptics driver");
 251 MODULE_LICENSE("GPL");
 252 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");