drivers/input/misc/sc27xx-vibra.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Spreadtrum Communications Inc.
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/of_address.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/regmap.h>
  10 #include <linux/input.h>
  11 #include <linux/workqueue.h>
  12
  13 #define CUR_DRV_CAL_SEL         GENMASK(13, 12)
  14 #define SLP_LDOVIBR_PD_EN       BIT(9)
  15 #define LDO_VIBR_PD             BIT(8)
  16
  17 struct vibra_info {
  18         struct input_dev        *input_dev;
  19         struct work_struct      play_work;
  20         struct regmap           *regmap;
  21         u32                     base;
  22         u32                     strength;
  23         bool                    enabled;
  24 };
  25
  26 static void sc27xx_vibra_set(struct vibra_info *info, bool on)
  27 {
  28         if (on) {
  29                 regmap_update_bits(info->regmap, info->base, LDO_VIBR_PD, 0);
  30                 regmap_update_bits(info->regmap, info->base,
  31                                    SLP_LDOVIBR_PD_EN, 0);
  32                 info->enabled = true;
  33         } else {
  34                 regmap_update_bits(info->regmap, info->base, LDO_VIBR_PD,
  35                                    LDO_VIBR_PD);
  36                 regmap_update_bits(info->regmap, info->base,
  37                                    SLP_LDOVIBR_PD_EN, SLP_LDOVIBR_PD_EN);
  38                 info->enabled = false;
  39         }
  40 }
  41
  42 static int sc27xx_vibra_hw_init(struct vibra_info *info)
  43 {
  44         return regmap_update_bits(info->regmap, info->base, CUR_DRV_CAL_SEL, 0);
  45 }
  46
  47 static void sc27xx_vibra_play_work(struct work_struct *work)
  48 {
  49         struct vibra_info *info = container_of(work, struct vibra_info,
  50                                                play_work);
  51
  52         if (info->strength && !info->enabled)
  53                 sc27xx_vibra_set(info, true);
  54         else if (info->strength == 0 && info->enabled)
  55                 sc27xx_vibra_set(info, false);
  56 }
  57
  58 static int sc27xx_vibra_play(struct input_dev *input, void *data,
  59                              struct ff_effect *effect)
  60 {
  61         struct vibra_info *info = input_get_drvdata(input);
  62
  63         info->strength = effect->u.rumble.weak_magnitude;
  64         schedule_work(&info->play_work);
  65
  66         return 0;
  67 }
  68
  69 static void sc27xx_vibra_close(struct input_dev *input)
  70 {
  71         struct vibra_info *info = input_get_drvdata(input);
  72
  73         cancel_work_sync(&info->play_work);
  74         if (info->enabled)
  75                 sc27xx_vibra_set(info, false);
  76 }
  77
  78 static int sc27xx_vibra_probe(struct platform_device *pdev)
  79 {
  80         struct vibra_info *info;
  81         int error;
  82
  83         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
  84         if (!info)
  85                 return -ENOMEM;
  86
  87         info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
  88         if (!info->regmap) {
  89                 dev_err(&pdev->dev, "failed to get vibrator regmap.\n");
  90                 return -ENODEV;
  91         }
  92
  93         error = device_property_read_u32(&pdev->dev, "reg", &info->base);
  94         if (error) {
  95                 dev_err(&pdev->dev, "failed to get vibrator base address.\n");
  96                 return error;
  97         }
  98
  99         info->input_dev = devm_input_allocate_device(&pdev->dev);
 100         if (!info->input_dev) {
 101                 dev_err(&pdev->dev, "failed to allocate input device.\n");
 102                 return -ENOMEM;
 103         }
 104
 105         info->input_dev->name = "sc27xx:vibrator";
 106         info->input_dev->id.version = 0;
 107         info->input_dev->close = sc27xx_vibra_close;
 108
 109         input_set_drvdata(info->input_dev, info);
 110         input_set_capability(info->input_dev, EV_FF, FF_RUMBLE);
 111         INIT_WORK(&info->play_work, sc27xx_vibra_play_work);
 112         info->enabled = false;
 113
 114         error = sc27xx_vibra_hw_init(info);
 115         if (error) {
 116                 dev_err(&pdev->dev, "failed to initialize the vibrator.\n");
 117                 return error;
 118         }
 119
 120         error = input_ff_create_memless(info->input_dev, NULL,
 121                                         sc27xx_vibra_play);
 122         if (error) {
 123                 dev_err(&pdev->dev, "failed to register vibrator to FF.\n");
 124                 return error;
 125         }
 126
 127         error = input_register_device(info->input_dev);
 128         if (error) {
 129                 dev_err(&pdev->dev, "failed to register input device.\n");
 130                 return error;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static const struct of_device_id sc27xx_vibra_of_match[] = {
 137         { .compatible = "sprd,sc2731-vibrator", },
 138         {}
 139 };
 140 MODULE_DEVICE_TABLE(of, sc27xx_vibra_of_match);
 141
 142 static struct platform_driver sc27xx_vibra_driver = {
 143         .driver = {
 144                 .name = "sc27xx-vibrator",
 145                 .of_match_table = sc27xx_vibra_of_match,
 146         },
 147         .probe = sc27xx_vibra_probe,
 148 };
 149
 150 module_platform_driver(sc27xx_vibra_driver);
 151
 152 MODULE_DESCRIPTION("Spreadtrum SC27xx Vibrator Driver");
 153 MODULE_LICENSE("GPL v2");
 154 MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");