summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/pwm-vibra.c
blob: 55da191ae550743edf6505a01cc3af53404910a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/*
 *  PWM vibrator driver
 *
 *  Copyright (C) 2017 Collabora Ltd.
 *
 *  Based on previous work from:
 *  Copyright (C) 2012 Dmitry Torokhov <dmitry.torokhov@gmail.com>
 *
 *  Based on PWM beeper driver:
 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 */

#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/pwm.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

struct pwm_vibrator {
	struct input_dev *input;
	struct pwm_device *pwm;
	struct pwm_device *pwm_dir;
	struct regulator *vcc;

	struct work_struct play_work;
	u16 level;
	u32 direction_duty_cycle;
};

static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
{
	struct device *pdev = vibrator->input->dev.parent;
	struct pwm_state state;
	int err;

	err = regulator_enable(vibrator->vcc);
	if (err) {
		dev_err(pdev, "failed to enable regulator: %d", err);
		return err;
	}

	pwm_get_state(vibrator->pwm, &state);
	pwm_set_relative_duty_cycle(&state, vibrator->level, 0xffff);
	state.enabled = true;

	err = pwm_apply_state(vibrator->pwm, &state);
	if (err) {
		dev_err(pdev, "failed to apply pwm state: %d", err);
		return err;
	}

	if (vibrator->pwm_dir) {
		pwm_get_state(vibrator->pwm_dir, &state);
		state.duty_cycle = vibrator->direction_duty_cycle;
		state.enabled = true;

		err = pwm_apply_state(vibrator->pwm_dir, &state);
		if (err) {
			dev_err(pdev, "failed to apply dir-pwm state: %d", err);
			pwm_disable(vibrator->pwm);
			return err;
		}
	}

	return 0;
}

static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
{
	regulator_disable(vibrator->vcc);

	if (vibrator->pwm_dir)
		pwm_disable(vibrator->pwm_dir);
	pwm_disable(vibrator->pwm);
}

static void pwm_vibrator_play_work(struct work_struct *work)
{
	struct pwm_vibrator *vibrator = container_of(work,
					struct pwm_vibrator, play_work);

	if (vibrator->level)
		pwm_vibrator_start(vibrator);
	else
		pwm_vibrator_stop(vibrator);
}

static int pwm_vibrator_play_effect(struct input_dev *dev, void *data,
				    struct ff_effect *effect)
{
	struct pwm_vibrator *vibrator = input_get_drvdata(dev);

	vibrator->level = effect->u.rumble.strong_magnitude;
	if (!vibrator->level)
		vibrator->level = effect->u.rumble.weak_magnitude;

	schedule_work(&vibrator->play_work);

	return 0;
}

static void pwm_vibrator_close(struct input_dev *input)
{
	struct pwm_vibrator *vibrator = input_get_drvdata(input);

	cancel_work_sync(&vibrator->play_work);
	pwm_vibrator_stop(vibrator);
}

static int pwm_vibrator_probe(struct platform_device *pdev)
{
	struct pwm_vibrator *vibrator;
	struct pwm_state state;
	int err;

	vibrator = devm_kzalloc(&pdev->dev, sizeof(*vibrator), GFP_KERNEL);
	if (!vibrator)
		return -ENOMEM;

	vibrator->input = devm_input_allocate_device(&pdev->dev);
	if (!vibrator->input)
		return -ENOMEM;

	vibrator->vcc = devm_regulator_get(&pdev->dev, "vcc");
	err = PTR_ERR_OR_ZERO(vibrator->vcc);
	if (err) {
		if (err != -EPROBE_DEFER)
			dev_err(&pdev->dev, "Failed to request regulator: %d",
				err);
		return err;
	}

	vibrator->pwm = devm_pwm_get(&pdev->dev, "enable");
	err = PTR_ERR_OR_ZERO(vibrator->pwm);
	if (err) {
		if (err != -EPROBE_DEFER)
			dev_err(&pdev->dev, "Failed to request main pwm: %d",
				err);
		return err;
	}

	INIT_WORK(&vibrator->play_work, pwm_vibrator_play_work);

	/* Sync up PWM state and ensure it is off. */
	pwm_init_state(vibrator->pwm, &state);
	state.enabled = false;
	err = pwm_apply_state(vibrator->pwm, &state);
	if (err) {
		dev_err(&pdev->dev, "failed to apply initial PWM state: %d",
			err);
		return err;
	}

	vibrator->pwm_dir = devm_pwm_get(&pdev->dev, "direction");
	err = PTR_ERR_OR_ZERO(vibrator->pwm_dir);
	switch (err) {
	case 0:
		/* Sync up PWM state and ensure it is off. */
		pwm_init_state(vibrator->pwm_dir, &state);
		state.enabled = false;
		err = pwm_apply_state(vibrator->pwm_dir, &state);
		if (err) {
			dev_err(&pdev->dev, "failed to apply initial PWM state: %d",
				err);
			return err;
		}

		vibrator->direction_duty_cycle =
			pwm_get_period(vibrator->pwm_dir) / 2;
		device_property_read_u32(&pdev->dev, "direction-duty-cycle-ns",
					 &vibrator->direction_duty_cycle);
		break;

	case -ENODATA:
		/* Direction PWM is optional */
		vibrator->pwm_dir = NULL;
		break;

	default:
		dev_err(&pdev->dev, "Failed to request direction pwm: %d", err);
		/* Fall through */

	case -EPROBE_DEFER:
		return err;
	}

	vibrator->input->name = "pwm-vibrator";
	vibrator->input->id.bustype = BUS_HOST;
	vibrator->input->dev.parent = &pdev->dev;
	vibrator->input->close = pwm_vibrator_close;

	input_set_drvdata(vibrator->input, vibrator);
	input_set_capability(vibrator->input, EV_FF, FF_RUMBLE);

	err = input_ff_create_memless(vibrator->input, NULL,
				      pwm_vibrator_play_effect);
	if (err) {
		dev_err(&pdev->dev, "Couldn't create FF dev: %d", err);
		return err;
	}

	err = input_register_device(vibrator->input);
	if (err) {
		dev_err(&pdev->dev, "Couldn't register input dev: %d", err);
		return err;
	}

	platform_set_drvdata(pdev, vibrator);

	return 0;
}

static int __maybe_unused pwm_vibrator_suspend(struct device *dev)
{
	struct pwm_vibrator *vibrator = dev_get_drvdata(dev);

	cancel_work_sync(&vibrator->play_work);
	if (vibrator->level)
		pwm_vibrator_stop(vibrator);

	return 0;
}

static int __maybe_unused pwm_vibrator_resume(struct device *dev)
{
	struct pwm_vibrator *vibrator = dev_get_drvdata(dev);

	if (vibrator->level)
		pwm_vibrator_start(vibrator);

	return 0;
}

static SIMPLE_DEV_PM_OPS(pwm_vibrator_pm_ops,
			 pwm_vibrator_suspend, pwm_vibrator_resume);

#ifdef CONFIG_OF
static const struct of_device_id pwm_vibra_dt_match_table[] = {
	{ .compatible = "pwm-vibrator" },
	{},
};
MODULE_DEVICE_TABLE(of, pwm_vibra_dt_match_table);
#endif

static struct platform_driver pwm_vibrator_driver = {
	.probe	= pwm_vibrator_probe,
	.driver	= {
		.name	= "pwm-vibrator",
		.pm	= &pwm_vibrator_pm_ops,
		.of_match_table = of_match_ptr(pwm_vibra_dt_match_table),
	},
};
module_platform_driver(pwm_vibrator_driver);

MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
MODULE_DESCRIPTION("PWM vibrator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pwm-vibrator");
OpenPOWER on IntegriCloud