drivers/input/misc/twl4030-vibra.c

   1 /*
   2  * twl4030-vibra.c - TWL4030 Vibrator driver
   3  *
   4  * Copyright (C) 2008-2010 Nokia Corporation
   5  *
   6  * Written by Henrik Saari <henrik.saari@nokia.com>
   7  * Updates by Felipe Balbi <felipe.balbi@nokia.com>
   8  * Input by Jari Vanhala <ext-jari.vanhala@nokia.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/i2c/twl.h>
  31 #include <linux/mfd/twl4030-audio.h>
  32 #include <linux/input.h>
  33 #include <linux/slab.h>
  34
  35 /* MODULE ID2 */
  36 #define LEDEN           0x00
  37
  38 /* ForceFeedback */
  39 #define EFFECT_DIR_180_DEG      0x8000 /* range is 0 - 0xFFFF */
  40
  41 struct vibra_info {
  42         struct device           *dev;
  43         struct input_dev        *input_dev;
  44
  45         struct workqueue_struct *workqueue;
  46         struct work_struct      play_work;
  47
  48         bool                    enabled;
  49         int                     speed;
  50         int                     direction;
  51
  52         bool                    coexist;
  53 };
  54
  55 static void vibra_disable_leds(void)
  56 {
  57         u8 reg;
  58
  59         /* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
  60         twl_i2c_read_u8(TWL4030_MODULE_LED, &reg, LEDEN);
  61         reg &= ~0x03;
  62         twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
  63 }
  64
  65 /* Powers H-Bridge and enables audio clk */
  66 static void vibra_enable(struct vibra_info *info)
  67 {
  68         u8 reg;
  69
  70         twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER);
  71
  72         /* turn H-Bridge on */
  73         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
  74                         &reg, TWL4030_REG_VIBRA_CTL);
  75         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
  76                          (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
  77
  78         twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL);
  79
  80         info->enabled = true;
  81 }
  82
  83 static void vibra_disable(struct vibra_info *info)
  84 {
  85         u8 reg;
  86
  87         /* Power down H-Bridge */
  88         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
  89                         &reg, TWL4030_REG_VIBRA_CTL);
  90         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
  91                          (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
  92
  93         twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL);
  94         twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER);
  95
  96         info->enabled = false;
  97 }
  98
  99 static void vibra_play_work(struct work_struct *work)
 100 {
 101         struct vibra_info *info = container_of(work,
 102                         struct vibra_info, play_work);
 103         int dir;
 104         int pwm;
 105         u8 reg;
 106
 107         dir = info->direction;
 108         pwm = info->speed;
 109
 110         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
 111                         &reg, TWL4030_REG_VIBRA_CTL);
 112         if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {
 113
 114                 if (!info->enabled)
 115                         vibra_enable(info);
 116
 117                 /* set vibra rotation direction */
 118                 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
 119                                 &reg, TWL4030_REG_VIBRA_CTL);
 120                 reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
 121                         (reg & ~TWL4030_VIBRA_DIR);
 122                 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 123                                  reg, TWL4030_REG_VIBRA_CTL);
 124
 125                 /* set PWM, 1 = max, 255 = min */
 126                 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 127                                  256 - pwm, TWL4030_REG_VIBRA_SET);
 128         } else {
 129                 if (info->enabled)
 130                         vibra_disable(info);
 131         }
 132 }
 133
 134 /*** Input/ForceFeedback ***/
 135
 136 static int vibra_play(struct input_dev *input, void *data,
 137                       struct ff_effect *effect)
 138 {
 139         struct vibra_info *info = input_get_drvdata(input);
 140
 141         info->speed = effect->u.rumble.strong_magnitude >> 8;
 142         if (!info->speed)
 143                 info->speed = effect->u.rumble.weak_magnitude >> 9;
 144         info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
 145         queue_work(info->workqueue, &info->play_work);
 146         return 0;
 147 }
 148
 149 static int twl4030_vibra_open(struct input_dev *input)
 150 {
 151         struct vibra_info *info = input_get_drvdata(input);
 152
 153         info->workqueue = create_singlethread_workqueue("vibra");
 154         if (info->workqueue == NULL) {
 155                 dev_err(&input->dev, "couldn't create workqueue\n");
 156                 return -ENOMEM;
 157         }
 158         return 0;
 159 }
 160
 161 static void twl4030_vibra_close(struct input_dev *input)
 162 {
 163         struct vibra_info *info = input_get_drvdata(input);
 164
 165         cancel_work_sync(&info->play_work);
 166         INIT_WORK(&info->play_work, vibra_play_work); /* cleanup */
 167         destroy_workqueue(info->workqueue);
 168         info->workqueue = NULL;
 169
 170         if (info->enabled)
 171                 vibra_disable(info);
 172 }
 173
 174 /*** Module ***/
 175 #if CONFIG_PM
 176 static int twl4030_vibra_suspend(struct device *dev)
 177 {
 178         struct platform_device *pdev = to_platform_device(dev);
 179         struct vibra_info *info = platform_get_drvdata(pdev);
 180
 181         if (info->enabled)
 182                 vibra_disable(info);
 183
 184         return 0;
 185 }
 186
 187 static int twl4030_vibra_resume(struct device *dev)
 188 {
 189         vibra_disable_leds();
 190         return 0;
 191 }
 192
 193 static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
 194                          twl4030_vibra_suspend, twl4030_vibra_resume);
 195 #endif
 196
 197 static int __devinit twl4030_vibra_probe(struct platform_device *pdev)
 198 {
 199         struct twl4030_vibra_data *pdata = pdev->dev.platform_data;
 200         struct vibra_info *info;
 201         int ret;
 202
 203         if (!pdata) {
 204                 dev_dbg(&pdev->dev, "platform_data not available\n");
 205                 return -EINVAL;
 206         }
 207
 208         info = kzalloc(sizeof(*info), GFP_KERNEL);
 209         if (!info)
 210                 return -ENOMEM;
 211
 212         info->dev = &pdev->dev;
 213         info->coexist = pdata->coexist;
 214         INIT_WORK(&info->play_work, vibra_play_work);
 215
 216         info->input_dev = input_allocate_device();
 217         if (info->input_dev == NULL) {
 218                 dev_err(&pdev->dev, "couldn't allocate input device\n");
 219                 ret = -ENOMEM;
 220                 goto err_kzalloc;
 221         }
 222
 223         input_set_drvdata(info->input_dev, info);
 224
 225         info->input_dev->name = "twl4030:vibrator";
 226         info->input_dev->id.version = 1;
 227         info->input_dev->dev.parent = pdev->dev.parent;
 228         info->input_dev->open = twl4030_vibra_open;
 229         info->input_dev->close = twl4030_vibra_close;
 230         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
 231
 232         ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
 233         if (ret < 0) {
 234                 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
 235                 goto err_ialloc;
 236         }
 237
 238         ret = input_register_device(info->input_dev);
 239         if (ret < 0) {
 240                 dev_dbg(&pdev->dev, "couldn't register input device\n");
 241                 goto err_iff;
 242         }
 243
 244         vibra_disable_leds();
 245
 246         platform_set_drvdata(pdev, info);
 247         return 0;
 248
 249 err_iff:
 250         input_ff_destroy(info->input_dev);
 251 err_ialloc:
 252         input_free_device(info->input_dev);
 253 err_kzalloc:
 254         kfree(info);
 255         return ret;
 256 }
 257
 258 static int __devexit twl4030_vibra_remove(struct platform_device *pdev)
 259 {
 260         struct vibra_info *info = platform_get_drvdata(pdev);
 261
 262         /* this also free ff-memless and calls close if needed */
 263         input_unregister_device(info->input_dev);
 264         kfree(info);
 265         platform_set_drvdata(pdev, NULL);
 266
 267         return 0;
 268 }
 269
 270 static struct platform_driver twl4030_vibra_driver = {
 271         .probe          = twl4030_vibra_probe,
 272         .remove         = __devexit_p(twl4030_vibra_remove),
 273         .driver         = {
 274                 .name   = "twl4030-vibra",
 275                 .owner  = THIS_MODULE,
 276 #ifdef CONFIG_PM
 277                 .pm     = &twl4030_vibra_pm_ops,
 278 #endif
 279         },
 280 };
 281
 282 static int __init twl4030_vibra_init(void)
 283 {
 284         return platform_driver_register(&twl4030_vibra_driver);
 285 }
 286 module_init(twl4030_vibra_init);
 287
 288 static void __exit twl4030_vibra_exit(void)
 289 {
 290         platform_driver_unregister(&twl4030_vibra_driver);
 291 }
 292 module_exit(twl4030_vibra_exit);
 293
 294 MODULE_ALIAS("platform:twl4030-vibra");
 295
 296 MODULE_DESCRIPTION("TWL4030 Vibra driver");
 297 MODULE_LICENSE("GPL");
 298 MODULE_AUTHOR("Nokia Corporation");