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d64cb71b JK |
1 | /* |
2 | * Regulator haptic driver | |
3 | * | |
4 | * Copyright (c) 2014 Samsung Electronics Co., Ltd. | |
5 | * Author: Jaewon Kim <jaewon02.kim@samsung.com> | |
6 | * Author: Hyunhee Kim <hyunhee.kim@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/input.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/platform_data/regulator-haptic.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/regulator/consumer.h> | |
19 | #include <linux/slab.h> | |
20 | ||
21 | #define MAX_MAGNITUDE_SHIFT 16 | |
22 | ||
23 | struct regulator_haptic { | |
24 | struct device *dev; | |
25 | struct input_dev *input_dev; | |
26 | struct regulator *regulator; | |
27 | ||
28 | struct work_struct work; | |
29 | struct mutex mutex; | |
30 | ||
31 | bool active; | |
32 | bool suspended; | |
33 | ||
34 | unsigned int max_volt; | |
35 | unsigned int min_volt; | |
36 | unsigned int magnitude; | |
37 | }; | |
38 | ||
39 | static int regulator_haptic_toggle(struct regulator_haptic *haptic, bool on) | |
40 | { | |
41 | int error; | |
42 | ||
43 | if (haptic->active != on) { | |
44 | ||
45 | error = on ? regulator_enable(haptic->regulator) : | |
46 | regulator_disable(haptic->regulator); | |
47 | if (error) { | |
48 | dev_err(haptic->dev, | |
49 | "failed to switch regulator %s: %d\n", | |
50 | on ? "on" : "off", error); | |
51 | return error; | |
52 | } | |
53 | ||
54 | haptic->active = on; | |
55 | } | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static int regulator_haptic_set_voltage(struct regulator_haptic *haptic, | |
61 | unsigned int magnitude) | |
62 | { | |
63 | u64 volt_mag_multi; | |
64 | unsigned int intensity; | |
65 | int error; | |
66 | ||
67 | volt_mag_multi = (u64)(haptic->max_volt - haptic->min_volt) * magnitude; | |
68 | intensity = (unsigned int)(volt_mag_multi >> MAX_MAGNITUDE_SHIFT); | |
69 | ||
70 | error = regulator_set_voltage(haptic->regulator, | |
71 | intensity + haptic->min_volt, | |
72 | haptic->max_volt); | |
73 | if (error) { | |
74 | dev_err(haptic->dev, "cannot set regulator voltage to %d: %d\n", | |
75 | intensity + haptic->min_volt, error); | |
76 | return error; | |
77 | } | |
78 | ||
3cb6dcfa AL |
79 | regulator_haptic_toggle(haptic, !!magnitude); |
80 | ||
d64cb71b JK |
81 | return 0; |
82 | } | |
83 | ||
84 | static void regulator_haptic_work(struct work_struct *work) | |
85 | { | |
86 | struct regulator_haptic *haptic = container_of(work, | |
87 | struct regulator_haptic, work); | |
d64cb71b JK |
88 | |
89 | mutex_lock(&haptic->mutex); | |
90 | ||
3cb6dcfa AL |
91 | if (!haptic->suspended) |
92 | regulator_haptic_set_voltage(haptic, haptic->magnitude); | |
d64cb71b | 93 | |
d64cb71b JK |
94 | mutex_unlock(&haptic->mutex); |
95 | } | |
96 | ||
97 | static int regulator_haptic_play_effect(struct input_dev *input, void *data, | |
98 | struct ff_effect *effect) | |
99 | { | |
100 | struct regulator_haptic *haptic = input_get_drvdata(input); | |
101 | ||
102 | haptic->magnitude = effect->u.rumble.strong_magnitude; | |
103 | if (!haptic->magnitude) | |
104 | haptic->magnitude = effect->u.rumble.weak_magnitude; | |
105 | ||
106 | schedule_work(&haptic->work); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static void regulator_haptic_close(struct input_dev *input) | |
112 | { | |
113 | struct regulator_haptic *haptic = input_get_drvdata(input); | |
114 | ||
115 | cancel_work_sync(&haptic->work); | |
116 | regulator_haptic_set_voltage(haptic, 0); | |
d64cb71b JK |
117 | } |
118 | ||
119 | static int __maybe_unused | |
120 | regulator_haptic_parse_dt(struct device *dev, struct regulator_haptic *haptic) | |
121 | { | |
122 | struct device_node *node; | |
123 | int error; | |
124 | ||
125 | node = dev->of_node; | |
126 | if(!node) { | |
98f27d96 | 127 | dev_err(dev, "Missing device tree data\n"); |
d64cb71b JK |
128 | return -EINVAL; |
129 | } | |
130 | ||
131 | error = of_property_read_u32(node, "max-microvolt", &haptic->max_volt); | |
132 | if (error) { | |
133 | dev_err(dev, "cannot parse max-microvolt\n"); | |
134 | return error; | |
135 | } | |
136 | ||
137 | error = of_property_read_u32(node, "min-microvolt", &haptic->min_volt); | |
138 | if (error) { | |
139 | dev_err(dev, "cannot parse min-microvolt\n"); | |
140 | return error; | |
141 | } | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static int regulator_haptic_probe(struct platform_device *pdev) | |
147 | { | |
148 | const struct regulator_haptic_data *pdata = dev_get_platdata(&pdev->dev); | |
149 | struct regulator_haptic *haptic; | |
150 | struct input_dev *input_dev; | |
151 | int error; | |
152 | ||
153 | haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL); | |
154 | if (!haptic) | |
155 | return -ENOMEM; | |
156 | ||
157 | platform_set_drvdata(pdev, haptic); | |
158 | haptic->dev = &pdev->dev; | |
159 | mutex_init(&haptic->mutex); | |
160 | INIT_WORK(&haptic->work, regulator_haptic_work); | |
161 | ||
162 | if (pdata) { | |
163 | haptic->max_volt = pdata->max_volt; | |
164 | haptic->min_volt = pdata->min_volt; | |
165 | } else if (IS_ENABLED(CONFIG_OF)) { | |
166 | error = regulator_haptic_parse_dt(&pdev->dev, haptic); | |
167 | if (error) | |
168 | return error; | |
169 | } else { | |
170 | dev_err(&pdev->dev, "Missing platform data\n"); | |
171 | return -EINVAL; | |
172 | } | |
173 | ||
174 | haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic"); | |
175 | if (IS_ERR(haptic->regulator)) { | |
176 | dev_err(&pdev->dev, "failed to get regulator\n"); | |
177 | return PTR_ERR(haptic->regulator); | |
178 | } | |
179 | ||
180 | input_dev = devm_input_allocate_device(&pdev->dev); | |
181 | if (!input_dev) | |
182 | return -ENOMEM; | |
183 | ||
184 | haptic->input_dev = input_dev; | |
185 | haptic->input_dev->name = "regulator-haptic"; | |
186 | haptic->input_dev->dev.parent = &pdev->dev; | |
187 | haptic->input_dev->close = regulator_haptic_close; | |
188 | input_set_drvdata(haptic->input_dev, haptic); | |
189 | input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE); | |
190 | ||
191 | error = input_ff_create_memless(input_dev, NULL, | |
192 | regulator_haptic_play_effect); | |
193 | if (error) { | |
194 | dev_err(&pdev->dev, "failed to create force-feedback\n"); | |
195 | return error; | |
196 | } | |
197 | ||
198 | error = input_register_device(haptic->input_dev); | |
199 | if (error) { | |
200 | dev_err(&pdev->dev, "failed to register input device\n"); | |
201 | return error; | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static int __maybe_unused regulator_haptic_suspend(struct device *dev) | |
208 | { | |
209 | struct platform_device *pdev = to_platform_device(dev); | |
210 | struct regulator_haptic *haptic = platform_get_drvdata(pdev); | |
211 | int error; | |
212 | ||
213 | error = mutex_lock_interruptible(&haptic->mutex); | |
214 | if (error) | |
215 | return error; | |
216 | ||
217 | regulator_haptic_set_voltage(haptic, 0); | |
d64cb71b JK |
218 | |
219 | haptic->suspended = true; | |
220 | ||
221 | mutex_unlock(&haptic->mutex); | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int __maybe_unused regulator_haptic_resume(struct device *dev) | |
227 | { | |
228 | struct platform_device *pdev = to_platform_device(dev); | |
229 | struct regulator_haptic *haptic = platform_get_drvdata(pdev); | |
230 | unsigned int magnitude; | |
231 | ||
232 | mutex_lock(&haptic->mutex); | |
233 | ||
234 | haptic->suspended = false; | |
235 | ||
236 | magnitude = ACCESS_ONCE(haptic->magnitude); | |
3cb6dcfa | 237 | if (magnitude) |
d64cb71b | 238 | regulator_haptic_set_voltage(haptic, magnitude); |
d64cb71b JK |
239 | |
240 | mutex_unlock(&haptic->mutex); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops, | |
246 | regulator_haptic_suspend, regulator_haptic_resume); | |
247 | ||
245165de | 248 | static const struct of_device_id regulator_haptic_dt_match[] = { |
d64cb71b JK |
249 | { .compatible = "regulator-haptic" }, |
250 | { /* sentinel */ }, | |
251 | }; | |
73185771 | 252 | MODULE_DEVICE_TABLE(of, regulator_haptic_dt_match); |
d64cb71b JK |
253 | |
254 | static struct platform_driver regulator_haptic_driver = { | |
255 | .probe = regulator_haptic_probe, | |
256 | .driver = { | |
257 | .name = "regulator-haptic", | |
258 | .of_match_table = regulator_haptic_dt_match, | |
259 | .pm = ®ulator_haptic_pm_ops, | |
260 | }, | |
261 | }; | |
262 | module_platform_driver(regulator_haptic_driver); | |
263 | ||
264 | MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>"); | |
265 | MODULE_AUTHOR("Hyunhee Kim <hyunhee.kim@samsung.com>"); | |
266 | MODULE_DESCRIPTION("Regulator haptic driver"); | |
267 | MODULE_LICENSE("GPL"); |