LXR linux/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
  41struct 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
  55static 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 */
  66static 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
  83static 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
  99static 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
 136static 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
 149static 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
 161static 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
 176static 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
 187static int twl4030_vibra_resume(struct device *dev)
 188{
 189        vibra_disable_leds();
 190        return 0;
 191}
 192
 193static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
 194                         twl4030_vibra_suspend, twl4030_vibra_resume);
 195#endif
 196
 197static 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
 249err_iff:
 250        input_ff_destroy(info->input_dev);
 251err_ialloc:
 252        input_free_device(info->input_dev);
 253err_kzalloc:
 254        kfree(info);
 255        return ret;
 256}
 257
 258static 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
 270static 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
 282static int __init twl4030_vibra_init(void)
 283{
 284        return platform_driver_register(&twl4030_vibra_driver);
 285}
 286module_init(twl4030_vibra_init);
 287
 288static void __exit twl4030_vibra_exit(void)
 289{
 290        platform_driver_unregister(&twl4030_vibra_driver);
 291}
 292module_exit(twl4030_vibra_exit);
 293
 294MODULE_ALIAS("platform:twl4030-vibra");
 295
 296MODULE_DESCRIPTION("TWL4030 Vibra driver");
 297MODULE_LICENSE("GPL");
 298MODULE_AUTHOR("Nokia Corporation");
 299