drivers/input/misc/pm8xxx-vibrator.c

   1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 #include <linux/errno.h>
  14 #include <linux/input.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regmap.h>
  21 #include <linux/slab.h>
  22
  23 #define VIB_MAX_LEVEL_mV        (3100)
  24 #define VIB_MIN_LEVEL_mV        (1200)
  25 #define VIB_MAX_LEVELS          (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV)
  26
  27 #define MAX_FF_SPEED            0xff
  28
  29 struct pm8xxx_regs {
  30         unsigned int enable_addr;
  31         unsigned int enable_mask;
  32
  33         unsigned int drv_addr;
  34         unsigned int drv_mask;
  35         unsigned int drv_shift;
  36         unsigned int drv_en_manual_mask;
  37 };
  38
  39 static const struct pm8xxx_regs pm8058_regs = {
  40         .drv_addr = 0x4A,
  41         .drv_mask = 0xf8,
  42         .drv_shift = 3,
  43         .drv_en_manual_mask = 0xfc,
  44 };
  45
  46 static struct pm8xxx_regs pm8916_regs = {
  47         .enable_addr = 0xc046,
  48         .enable_mask = BIT(7),
  49         .drv_addr = 0xc041,
  50         .drv_mask = 0x1F,
  51         .drv_shift = 0,
  52         .drv_en_manual_mask = 0,
  53 };
  54
  55 /**
  56  * struct pm8xxx_vib - structure to hold vibrator data
  57  * @vib_input_dev: input device supporting force feedback
  58  * @work: work structure to set the vibration parameters
  59  * @regmap: regmap for register read/write
  60  * @regs: registers' info
  61  * @speed: speed of vibration set from userland
  62  * @active: state of vibrator
  63  * @level: level of vibration to set in the chip
  64  * @reg_vib_drv: regs->drv_addr register value
  65  */
  66 struct pm8xxx_vib {
  67         struct input_dev *vib_input_dev;
  68         struct work_struct work;
  69         struct regmap *regmap;
  70         const struct pm8xxx_regs *regs;
  71         int speed;
  72         int level;
  73         bool active;
  74         u8  reg_vib_drv;
  75 };
  76
  77 /**
  78  * pm8xxx_vib_set - handler to start/stop vibration
  79  * @vib: pointer to vibrator structure
  80  * @on: state to set
  81  */
  82 static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
  83 {
  84         int rc;
  85         unsigned int val = vib->reg_vib_drv;
  86         const struct pm8xxx_regs *regs = vib->regs;
  87
  88         if (on)
  89                 val |= (vib->level << regs->drv_shift) & regs->drv_mask;
  90         else
  91                 val &= ~regs->drv_mask;
  92
  93         rc = regmap_write(vib->regmap, regs->drv_addr, val);
  94         if (rc < 0)
  95                 return rc;
  96
  97         vib->reg_vib_drv = val;
  98
  99         if (regs->enable_mask)
 100                 rc = regmap_update_bits(vib->regmap, regs->enable_addr,
 101                                         on ? regs->enable_mask : 0, val);
 102
 103         return rc;
 104 }
 105
 106 /**
 107  * pm8xxx_work_handler - worker to set vibration level
 108  * @work: pointer to work_struct
 109  */
 110 static void pm8xxx_work_handler(struct work_struct *work)
 111 {
 112         struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work);
 113         const struct pm8xxx_regs *regs = vib->regs;
 114         int rc;
 115         unsigned int val;
 116
 117         rc = regmap_read(vib->regmap, regs->drv_addr, &val);
 118         if (rc < 0)
 119                 return;
 120
 121         /*
 122          * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so
 123          * scale the level to fit into these ranges.
 124          */
 125         if (vib->speed) {
 126                 vib->active = true;
 127                 vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) +
 128                                                 VIB_MIN_LEVEL_mV;
 129                 vib->level /= 100;
 130         } else {
 131                 vib->active = false;
 132                 vib->level = VIB_MIN_LEVEL_mV / 100;
 133         }
 134
 135         pm8xxx_vib_set(vib, vib->active);
 136 }
 137
 138 /**
 139  * pm8xxx_vib_close - callback of input close callback
 140  * @dev: input device pointer
 141  *
 142  * Turns off the vibrator.
 143  */
 144 static void pm8xxx_vib_close(struct input_dev *dev)
 145 {
 146         struct pm8xxx_vib *vib = input_get_drvdata(dev);
 147
 148         cancel_work_sync(&vib->work);
 149         if (vib->active)
 150                 pm8xxx_vib_set(vib, false);
 151 }
 152
 153 /**
 154  * pm8xxx_vib_play_effect - function to handle vib effects.
 155  * @dev: input device pointer
 156  * @data: data of effect
 157  * @effect: effect to play
 158  *
 159  * Currently this driver supports only rumble effects.
 160  */
 161 static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data,
 162                                   struct ff_effect *effect)
 163 {
 164         struct pm8xxx_vib *vib = input_get_drvdata(dev);
 165
 166         vib->speed = effect->u.rumble.strong_magnitude >> 8;
 167         if (!vib->speed)
 168                 vib->speed = effect->u.rumble.weak_magnitude >> 9;
 169
 170         schedule_work(&vib->work);
 171
 172         return 0;
 173 }
 174
 175 static int pm8xxx_vib_probe(struct platform_device *pdev)
 176 {
 177         struct pm8xxx_vib *vib;
 178         struct input_dev *input_dev;
 179         int error;
 180         unsigned int val;
 181         const struct pm8xxx_regs *regs;
 182
 183         vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL);
 184         if (!vib)
 185                 return -ENOMEM;
 186
 187         vib->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 188         if (!vib->regmap)
 189                 return -ENODEV;
 190
 191         input_dev = devm_input_allocate_device(&pdev->dev);
 192         if (!input_dev)
 193                 return -ENOMEM;
 194
 195         INIT_WORK(&vib->work, pm8xxx_work_handler);
 196         vib->vib_input_dev = input_dev;
 197
 198         regs = of_device_get_match_data(&pdev->dev);
 199
 200         /* operate in manual mode */
 201         error = regmap_read(vib->regmap, regs->drv_addr, &val);
 202         if (error < 0)
 203                 return error;
 204
 205         val &= regs->drv_en_manual_mask;
 206         error = regmap_write(vib->regmap, regs->drv_addr, val);
 207         if (error < 0)
 208                 return error;
 209
 210         vib->regs = regs;
 211         vib->reg_vib_drv = val;
 212
 213         input_dev->name = "pm8xxx_vib_ffmemless";
 214         input_dev->id.version = 1;
 215         input_dev->close = pm8xxx_vib_close;
 216         input_set_drvdata(input_dev, vib);
 217         input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE);
 218
 219         error = input_ff_create_memless(input_dev, NULL,
 220                                         pm8xxx_vib_play_effect);
 221         if (error) {
 222                 dev_err(&pdev->dev,
 223                         "couldn't register vibrator as FF device\n");
 224                 return error;
 225         }
 226
 227         error = input_register_device(input_dev);
 228         if (error) {
 229                 dev_err(&pdev->dev, "couldn't register input device\n");
 230                 return error;
 231         }
 232
 233         platform_set_drvdata(pdev, vib);
 234         return 0;
 235 }
 236
 237 static int __maybe_unused pm8xxx_vib_suspend(struct device *dev)
 238 {
 239         struct pm8xxx_vib *vib = dev_get_drvdata(dev);
 240
 241         /* Turn off the vibrator */
 242         pm8xxx_vib_set(vib, false);
 243
 244         return 0;
 245 }
 246
 247 static SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL);
 248
 249 static const struct of_device_id pm8xxx_vib_id_table[] = {
 250         { .compatible = "qcom,pm8058-vib", .data = &pm8058_regs },
 251         { .compatible = "qcom,pm8921-vib", .data = &pm8058_regs },
 252         { .compatible = "qcom,pm8916-vib", .data = &pm8916_regs },
 253         { }
 254 };
 255 MODULE_DEVICE_TABLE(of, pm8xxx_vib_id_table);
 256
 257 static struct platform_driver pm8xxx_vib_driver = {
 258         .probe          = pm8xxx_vib_probe,
 259         .driver         = {
 260                 .name   = "pm8xxx-vib",
 261                 .pm     = &pm8xxx_vib_pm_ops,
 262                 .of_match_table = pm8xxx_vib_id_table,
 263         },
 264 };
 265 module_platform_driver(pm8xxx_vib_driver);
 266
 267 MODULE_ALIAS("platform:pm8xxx_vib");
 268 MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework");
 269 MODULE_LICENSE("GPL v2");
 270 MODULE_AUTHOR("Amy Maloche <amaloche@codeaurora.org>");