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
17struct 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
26static 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
42static 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
47static 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
58static 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
69static 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
78static 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
136static const struct of_device_id sc27xx_vibra_of_match[] = {
137	{ .compatible = "sprd,sc2731-vibrator", },
138	{}
139};
140MODULE_DEVICE_TABLE(of, sc27xx_vibra_of_match);
141
142static 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
150module_platform_driver(sc27xx_vibra_driver);
151
152MODULE_DESCRIPTION("Spreadtrum SC27xx Vibrator Driver");
153MODULE_LICENSE("GPL v2");
154MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");
155