kernel/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/of.h>
  30 #include <linux/workqueue.h>
  31 #include <linux/i2c/twl.h>
  32 #include <linux/mfd/twl4030-audio.h>
  33 #include <linux/input.h>
  34 #include <linux/slab.h>
  35
  36 /* MODULE ID2 */
  37 #define LEDEN           0x00
  38
  39 /* ForceFeedback */
  40 #define EFFECT_DIR_180_DEG      0x8000 /* range is 0 - 0xFFFF */
  41
  42 struct vibra_info {
  43         struct device           *dev;
  44         struct input_dev        *input_dev;
  45
  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         schedule_work(&info->play_work);
 146         return 0;
 147 }
 148
 149 static void twl4030_vibra_close(struct input_dev *input)
 150 {
 151         struct vibra_info *info = input_get_drvdata(input);
 152
 153         cancel_work_sync(&info->play_work);
 154
 155         if (info->enabled)
 156                 vibra_disable(info);
 157 }
 158
 159 /*** Module ***/
 160 static int __maybe_unused twl4030_vibra_suspend(struct device *dev)
 161 {
 162         struct platform_device *pdev = to_platform_device(dev);
 163         struct vibra_info *info = platform_get_drvdata(pdev);
 164
 165         if (info->enabled)
 166                 vibra_disable(info);
 167
 168         return 0;
 169 }
 170
 171 static int __maybe_unused twl4030_vibra_resume(struct device *dev)
 172 {
 173         vibra_disable_leds();
 174         return 0;
 175 }
 176
 177 static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
 178                          twl4030_vibra_suspend, twl4030_vibra_resume);
 179
 180 static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
 181                               struct device_node *node)
 182 {
 183         if (pdata && pdata->coexist)
 184                 return true;
 185
 186         node = of_find_node_by_name(node, "codec");
 187         if (node) {
 188                 of_node_put(node);
 189                 return true;
 190         }
 191
 192         return false;
 193 }
 194
 195 static int twl4030_vibra_probe(struct platform_device *pdev)
 196 {
 197         struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
 198         struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
 199         struct vibra_info *info;
 200         int ret;
 201
 202         if (!pdata && !twl4030_core_node) {
 203                 dev_dbg(&pdev->dev, "platform_data not available\n");
 204                 return -EINVAL;
 205         }
 206
 207         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 208         if (!info)
 209                 return -ENOMEM;
 210
 211         info->dev = &pdev->dev;
 212         info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
 213         INIT_WORK(&info->play_work, vibra_play_work);
 214
 215         info->input_dev = devm_input_allocate_device(&pdev->dev);
 216         if (info->input_dev == NULL) {
 217                 dev_err(&pdev->dev, "couldn't allocate input device\n");
 218                 return -ENOMEM;
 219         }
 220
 221         input_set_drvdata(info->input_dev, info);
 222
 223         info->input_dev->name = "twl4030:vibrator";
 224         info->input_dev->id.version = 1;
 225         info->input_dev->dev.parent = pdev->dev.parent;
 226         info->input_dev->close = twl4030_vibra_close;
 227         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
 228
 229         ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
 230         if (ret < 0) {
 231                 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
 232                 return ret;
 233         }
 234
 235         ret = input_register_device(info->input_dev);
 236         if (ret < 0) {
 237                 dev_dbg(&pdev->dev, "couldn't register input device\n");
 238                 goto err_iff;
 239         }
 240
 241         vibra_disable_leds();
 242
 243         platform_set_drvdata(pdev, info);
 244         return 0;
 245
 246 err_iff:
 247         input_ff_destroy(info->input_dev);
 248         return ret;
 249 }
 250
 251 static struct platform_driver twl4030_vibra_driver = {
 252         .probe          = twl4030_vibra_probe,
 253         .driver         = {
 254                 .name   = "twl4030-vibra",
 255                 .pm     = &twl4030_vibra_pm_ops,
 256         },
 257 };
 258 module_platform_driver(twl4030_vibra_driver);
 259
 260 MODULE_ALIAS("platform:twl4030-vibra");
 261 MODULE_DESCRIPTION("TWL4030 Vibra driver");
 262 MODULE_LICENSE("GPL");
 263 MODULE_AUTHOR("Nokia Corporation");