drivers/input/misc/arizona-haptics.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Arizona haptics driver
   4  *
   5  * Copyright 2012 Wolfson Microelectronics plc
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/input.h>
  13 #include <linux/slab.h>
  14
  15 #include <sound/soc.h>
  16 #include <sound/soc-dapm.h>
  17
  18 #include <linux/mfd/arizona/core.h>
  19 #include <linux/mfd/arizona/pdata.h>
  20 #include <linux/mfd/arizona/registers.h>
  21
  22 struct arizona_haptics {
  23         struct arizona *arizona;
  24         struct input_dev *input_dev;
  25         struct work_struct work;
  26
  27         struct mutex mutex;
  28         u8 intensity;
  29 };
  30
  31 static void arizona_haptics_work(struct work_struct *work)
  32 {
  33         struct arizona_haptics *haptics = container_of(work,
  34                                                        struct arizona_haptics,
  35                                                        work);
  36         struct arizona *arizona = haptics->arizona;
  37         struct snd_soc_component *component =
  38                 snd_soc_dapm_to_component(arizona->dapm);
  39         int ret;
  40
  41         if (!haptics->arizona->dapm) {
  42                 dev_err(arizona->dev, "No DAPM context\n");
  43                 return;
  44         }
  45
  46         if (haptics->intensity) {
  47                 ret = regmap_update_bits(arizona->regmap,
  48                                          ARIZONA_HAPTICS_PHASE_2_INTENSITY,
  49                                          ARIZONA_PHASE2_INTENSITY_MASK,
  50                                          haptics->intensity);
  51                 if (ret != 0) {
  52                         dev_err(arizona->dev, "Failed to set intensity: %d\n",
  53                                 ret);
  54                         return;
  55                 }
  56
  57                 /* This enable sequence will be a noop if already enabled */
  58                 ret = regmap_update_bits(arizona->regmap,
  59                                          ARIZONA_HAPTICS_CONTROL_1,
  60                                          ARIZONA_HAP_CTRL_MASK,
  61                                          1 << ARIZONA_HAP_CTRL_SHIFT);
  62                 if (ret != 0) {
  63                         dev_err(arizona->dev, "Failed to start haptics: %d\n",
  64                                 ret);
  65                         return;
  66                 }
  67
  68                 ret = snd_soc_component_enable_pin(component, "HAPTICS");
  69                 if (ret != 0) {
  70                         dev_err(arizona->dev, "Failed to start HAPTICS: %d\n",
  71                                 ret);
  72                         return;
  73                 }
  74
  75                 ret = snd_soc_dapm_sync(arizona->dapm);
  76                 if (ret != 0) {
  77                         dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
  78                                 ret);
  79                         return;
  80                 }
  81         } else {
  82                 /* This disable sequence will be a noop if already enabled */
  83                 ret = snd_soc_component_disable_pin(component, "HAPTICS");
  84                 if (ret != 0) {
  85                         dev_err(arizona->dev, "Failed to disable HAPTICS: %d\n",
  86                                 ret);
  87                         return;
  88                 }
  89
  90                 ret = snd_soc_dapm_sync(arizona->dapm);
  91                 if (ret != 0) {
  92                         dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
  93                                 ret);
  94                         return;
  95                 }
  96
  97                 ret = regmap_update_bits(arizona->regmap,
  98                                          ARIZONA_HAPTICS_CONTROL_1,
  99                                          ARIZONA_HAP_CTRL_MASK, 0);
 100                 if (ret != 0) {
 101                         dev_err(arizona->dev, "Failed to stop haptics: %d\n",
 102                                 ret);
 103                         return;
 104                 }
 105         }
 106 }
 107
 108 static int arizona_haptics_play(struct input_dev *input, void *data,
 109                                 struct ff_effect *effect)
 110 {
 111         struct arizona_haptics *haptics = input_get_drvdata(input);
 112         struct arizona *arizona = haptics->arizona;
 113
 114         if (!arizona->dapm) {
 115                 dev_err(arizona->dev, "No DAPM context\n");
 116                 return -EBUSY;
 117         }
 118
 119         if (effect->u.rumble.strong_magnitude) {
 120                 /* Scale the magnitude into the range the device supports */
 121                 if (arizona->pdata.hap_act) {
 122                         haptics->intensity =
 123                                 effect->u.rumble.strong_magnitude >> 9;
 124                         if (effect->direction < 0x8000)
 125                                 haptics->intensity += 0x7f;
 126                 } else {
 127                         haptics->intensity =
 128                                 effect->u.rumble.strong_magnitude >> 8;
 129                 }
 130         } else {
 131                 haptics->intensity = 0;
 132         }
 133
 134         schedule_work(&haptics->work);
 135
 136         return 0;
 137 }
 138
 139 static void arizona_haptics_close(struct input_dev *input)
 140 {
 141         struct arizona_haptics *haptics = input_get_drvdata(input);
 142         struct snd_soc_component *component;
 143
 144         cancel_work_sync(&haptics->work);
 145
 146         if (haptics->arizona->dapm) {
 147                 component = snd_soc_dapm_to_component(haptics->arizona->dapm);
 148                 snd_soc_component_disable_pin(component, "HAPTICS");
 149         }
 150 }
 151
 152 static int arizona_haptics_probe(struct platform_device *pdev)
 153 {
 154         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 155         struct arizona_haptics *haptics;
 156         int ret;
 157
 158         haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
 159         if (!haptics)
 160                 return -ENOMEM;
 161
 162         haptics->arizona = arizona;
 163
 164         ret = regmap_update_bits(arizona->regmap, ARIZONA_HAPTICS_CONTROL_1,
 165                                  ARIZONA_HAP_ACT, arizona->pdata.hap_act);
 166         if (ret != 0) {
 167                 dev_err(arizona->dev, "Failed to set haptics actuator: %d\n",
 168                         ret);
 169                 return ret;
 170         }
 171
 172         INIT_WORK(&haptics->work, arizona_haptics_work);
 173
 174         haptics->input_dev = devm_input_allocate_device(&pdev->dev);
 175         if (!haptics->input_dev) {
 176                 dev_err(arizona->dev, "Failed to allocate input device\n");
 177                 return -ENOMEM;
 178         }
 179
 180         input_set_drvdata(haptics->input_dev, haptics);
 181
 182         haptics->input_dev->name = "arizona:haptics";
 183         haptics->input_dev->close = arizona_haptics_close;
 184         __set_bit(FF_RUMBLE, haptics->input_dev->ffbit);
 185
 186         ret = input_ff_create_memless(haptics->input_dev, NULL,
 187                                       arizona_haptics_play);
 188         if (ret < 0) {
 189                 dev_err(arizona->dev, "input_ff_create_memless() failed: %d\n",
 190                         ret);
 191                 return ret;
 192         }
 193
 194         ret = input_register_device(haptics->input_dev);
 195         if (ret < 0) {
 196                 dev_err(arizona->dev, "couldn't register input device: %d\n",
 197                         ret);
 198                 return ret;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static struct platform_driver arizona_haptics_driver = {
 205         .probe          = arizona_haptics_probe,
 206         .driver         = {
 207                 .name   = "arizona-haptics",
 208         },
 209 };
 210 module_platform_driver(arizona_haptics_driver);
 211
 212 MODULE_ALIAS("platform:arizona-haptics");
 213 MODULE_DESCRIPTION("Arizona haptics driver");
 214 MODULE_LICENSE("GPL");
 215 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");