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/device.h>
   7 #include <linux/input.h>
   8 #include <linux/mod_devicetable.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/property.h>
  12 #include <linux/regmap.h>
  13 #include <linux/workqueue.h>
  14
  15 #define CUR_DRV_CAL_SEL                 GENMASK(13, 12)
  16 #define SLP_LDOVIBR_PD_EN               BIT(9)
  17 #define LDO_VIBR_PD                     BIT(8)
  18 #define SC2730_CUR_DRV_CAL_SEL          0
  19 #define SC2730_SLP_LDOVIBR_PD_EN        BIT(14)
  20 #define SC2730_LDO_VIBR_PD              BIT(13)
  21
  22 struct sc27xx_vibra_data {
  23         u32 cur_drv_cal_sel;
  24         u32 slp_pd_en;
  25         u32 ldo_pd;
  26 };
  27
  28 struct vibra_info {
  29         struct input_dev        *input_dev;
  30         struct work_struct      play_work;
  31         struct regmap           *regmap;
  32         const struct sc27xx_vibra_data *data;
  33         u32                     base;
  34         u32                     strength;
  35         bool                    enabled;
  36 };
  37
  38 static const struct sc27xx_vibra_data sc2731_data = {
  39         .cur_drv_cal_sel = CUR_DRV_CAL_SEL,
  40         .slp_pd_en = SLP_LDOVIBR_PD_EN,
  41         .ldo_pd = LDO_VIBR_PD,
  42 };
  43
  44 static const struct sc27xx_vibra_data sc2730_data = {
  45         .cur_drv_cal_sel = SC2730_CUR_DRV_CAL_SEL,
  46         .slp_pd_en = SC2730_SLP_LDOVIBR_PD_EN,
  47         .ldo_pd = SC2730_LDO_VIBR_PD,
  48 };
  49
  50 static const struct sc27xx_vibra_data sc2721_data = {
  51         .cur_drv_cal_sel = CUR_DRV_CAL_SEL,
  52         .slp_pd_en = SLP_LDOVIBR_PD_EN,
  53         .ldo_pd = LDO_VIBR_PD,
  54 };
  55
  56 static void sc27xx_vibra_set(struct vibra_info *info, bool on)
  57 {
  58         const struct sc27xx_vibra_data *data = info->data;
  59         if (on) {
  60                 regmap_update_bits(info->regmap, info->base, data->ldo_pd, 0);
  61                 regmap_update_bits(info->regmap, info->base,
  62                                    data->slp_pd_en, 0);
  63                 info->enabled = true;
  64         } else {
  65                 regmap_update_bits(info->regmap, info->base, data->ldo_pd,
  66                                    data->ldo_pd);
  67                 regmap_update_bits(info->regmap, info->base,
  68                                    data->slp_pd_en, data->slp_pd_en);
  69                 info->enabled = false;
  70         }
  71 }
  72
  73 static int sc27xx_vibra_hw_init(struct vibra_info *info)
  74 {
  75         const struct sc27xx_vibra_data *data = info->data;
  76
  77         if (!data->cur_drv_cal_sel)
  78                 return 0;
  79
  80         return regmap_update_bits(info->regmap, info->base,
  81                                   data->cur_drv_cal_sel, 0);
  82 }
  83
  84 static void sc27xx_vibra_play_work(struct work_struct *work)
  85 {
  86         struct vibra_info *info = container_of(work, struct vibra_info,
  87                                                play_work);
  88
  89         if (info->strength && !info->enabled)
  90                 sc27xx_vibra_set(info, true);
  91         else if (info->strength == 0 && info->enabled)
  92                 sc27xx_vibra_set(info, false);
  93 }
  94
  95 static int sc27xx_vibra_play(struct input_dev *input, void *data,
  96                              struct ff_effect *effect)
  97 {
  98         struct vibra_info *info = input_get_drvdata(input);
  99
 100         info->strength = effect->u.rumble.weak_magnitude;
 101         schedule_work(&info->play_work);
 102
 103         return 0;
 104 }
 105
 106 static void sc27xx_vibra_close(struct input_dev *input)
 107 {
 108         struct vibra_info *info = input_get_drvdata(input);
 109
 110         cancel_work_sync(&info->play_work);
 111         if (info->enabled)
 112                 sc27xx_vibra_set(info, false);
 113 }
 114
 115 static int sc27xx_vibra_probe(struct platform_device *pdev)
 116 {
 117         struct vibra_info *info;
 118         const struct sc27xx_vibra_data *data;
 119         int error;
 120
 121         data = device_get_match_data(&pdev->dev);
 122         if (!data) {
 123                 dev_err(&pdev->dev, "no matching driver data found\n");
 124                 return -EINVAL;
 125         }
 126
 127         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 128         if (!info)
 129                 return -ENOMEM;
 130
 131         info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 132         if (!info->regmap) {
 133                 dev_err(&pdev->dev, "failed to get vibrator regmap.\n");
 134                 return -ENODEV;
 135         }
 136
 137         error = device_property_read_u32(&pdev->dev, "reg", &info->base);
 138         if (error) {
 139                 dev_err(&pdev->dev, "failed to get vibrator base address.\n");
 140                 return error;
 141         }
 142
 143         info->input_dev = devm_input_allocate_device(&pdev->dev);
 144         if (!info->input_dev) {
 145                 dev_err(&pdev->dev, "failed to allocate input device.\n");
 146                 return -ENOMEM;
 147         }
 148
 149         info->input_dev->name = "sc27xx:vibrator";
 150         info->input_dev->id.version = 0;
 151         info->input_dev->close = sc27xx_vibra_close;
 152         info->data = data;
 153
 154         input_set_drvdata(info->input_dev, info);
 155         input_set_capability(info->input_dev, EV_FF, FF_RUMBLE);
 156         INIT_WORK(&info->play_work, sc27xx_vibra_play_work);
 157         info->enabled = false;
 158
 159         error = sc27xx_vibra_hw_init(info);
 160         if (error) {
 161                 dev_err(&pdev->dev, "failed to initialize the vibrator.\n");
 162                 return error;
 163         }
 164
 165         error = input_ff_create_memless(info->input_dev, NULL,
 166                                         sc27xx_vibra_play);
 167         if (error) {
 168                 dev_err(&pdev->dev, "failed to register vibrator to FF.\n");
 169                 return error;
 170         }
 171
 172         error = input_register_device(info->input_dev);
 173         if (error) {
 174                 dev_err(&pdev->dev, "failed to register input device.\n");
 175                 return error;
 176         }
 177
 178         return 0;
 179 }
 180
 181 static const struct of_device_id sc27xx_vibra_of_match[] = {
 182         { .compatible = "sprd,sc2721-vibrator", .data = &sc2721_data },
 183         { .compatible = "sprd,sc2730-vibrator", .data = &sc2730_data },
 184         { .compatible = "sprd,sc2731-vibrator", .data = &sc2731_data },
 185         {}
 186 };
 187 MODULE_DEVICE_TABLE(of, sc27xx_vibra_of_match);
 188
 189 static struct platform_driver sc27xx_vibra_driver = {
 190         .driver = {
 191                 .name = "sc27xx-vibrator",
 192                 .of_match_table = sc27xx_vibra_of_match,
 193         },
 194         .probe = sc27xx_vibra_probe,
 195 };
 196
 197 module_platform_driver(sc27xx_vibra_driver);
 198
 199 MODULE_DESCRIPTION("Spreadtrum SC27xx Vibrator Driver");
 200 MODULE_LICENSE("GPL v2");
 201 MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");