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>"); 256