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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Spreadtrum Communications Inc.
*/
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/input.h>
#include <linux/workqueue.h>
#define CUR_DRV_CAL_SEL GENMASK(13, 12)
#define SLP_LDOVIBR_PD_EN BIT(9)
#define LDO_VIBR_PD BIT(8)
struct vibra_info {
struct input_dev *input_dev;
struct work_struct play_work;
struct regmap *regmap;
u32 base;
u32 strength;
bool enabled;
};
static void sc27xx_vibra_set(struct vibra_info *info, bool on)
{
if (on) {
regmap_update_bits(info->regmap, info->base, LDO_VIBR_PD, 0);
regmap_update_bits(info->regmap, info->base,
SLP_LDOVIBR_PD_EN, 0);
info->enabled = true;
} else {
regmap_update_bits(info->regmap, info->base, LDO_VIBR_PD,
LDO_VIBR_PD);
regmap_update_bits(info->regmap, info->base,
SLP_LDOVIBR_PD_EN, SLP_LDOVIBR_PD_EN);
info->enabled = false;
}
}
static int sc27xx_vibra_hw_init(struct vibra_info *info)
{
return regmap_update_bits(info->regmap, info->base, CUR_DRV_CAL_SEL, 0);
}
static void sc27xx_vibra_play_work(struct work_struct *work)
{
struct vibra_info *info = container_of(work, struct vibra_info,
play_work);
if (info->strength && !info->enabled)
sc27xx_vibra_set(info, true);
else if (info->strength == 0 && info->enabled)
sc27xx_vibra_set(info, false);
}
static int sc27xx_vibra_play(struct input_dev *input, void *data,
struct ff_effect *effect)
{
struct vibra_info *info = input_get_drvdata(input);
info->strength = effect->u.rumble.weak_magnitude;
schedule_work(&info->play_work);
return 0;
}
static void sc27xx_vibra_close(struct input_dev *input)
{
struct vibra_info *info = input_get_drvdata(input);
cancel_work_sync(&info->play_work);
if (info->enabled)
sc27xx_vibra_set(info, false);
}
static int sc27xx_vibra_probe(struct platform_device *pdev)
{
struct vibra_info *info;
int error;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!info->regmap) {
dev_err(&pdev->dev, "failed to get vibrator regmap.\n");
return -ENODEV;
}
error = device_property_read_u32(&pdev->dev, "reg", &info->base);
if (error) {
dev_err(&pdev->dev, "failed to get vibrator base address.\n");
return error;
}
info->input_dev = devm_input_allocate_device(&pdev->dev);
if (!info->input_dev) {
dev_err(&pdev->dev, "failed to allocate input device.\n");
return -ENOMEM;
}
info->input_dev->name = "sc27xx:vibrator";
info->input_dev->id.version = 0;
info->input_dev->close = sc27xx_vibra_close;
input_set_drvdata(info->input_dev, info);
input_set_capability(info->input_dev, EV_FF, FF_RUMBLE);
INIT_WORK(&info->play_work, sc27xx_vibra_play_work);
info->enabled = false;
error = sc27xx_vibra_hw_init(info);
if (error) {
dev_err(&pdev->dev, "failed to initialize the vibrator.\n");
return error;
}
error = input_ff_create_memless(info->input_dev, NULL,
sc27xx_vibra_play);
if (error) {
dev_err(&pdev->dev, "failed to register vibrator to FF.\n");
return error;
}
error = input_register_device(info->input_dev);
if (error) {
dev_err(&pdev->dev, "failed to register input device.\n");
return error;
}
return 0;
}
static const struct of_device_id sc27xx_vibra_of_match[] = {
{ .compatible = "sprd,sc2731-vibrator", },
{}
};
MODULE_DEVICE_TABLE(of, sc27xx_vibra_of_match);
static struct platform_driver sc27xx_vibra_driver = {
.driver = {
.name = "sc27xx-vibrator",
.of_match_table = sc27xx_vibra_of_match,
},
.probe = sc27xx_vibra_probe,
};
module_platform_driver(sc27xx_vibra_driver);
MODULE_DESCRIPTION("Spreadtrum SC27xx Vibrator Driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");
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