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