Release 4.12 drivers/input/misc/pwm-beeper.c

/*
 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
 *  PWM beeper driver
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

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


struct pwm_beeper {
	
struct input_dev *input;
	
struct pwm_device *pwm;
	
struct regulator *amplifier;
	
struct work_struct work;
	
unsigned long period;
	
unsigned int bell_frequency;
	
bool suspended;
	
bool amplifier_on;
};


#define HZ_TO_NANOSECONDS(x) (1000000000UL/(x))



static int pwm_beeper_on(struct pwm_beeper *beeper, unsigned long period)
{
	struct pwm_state state;
	int error;

	pwm_get_state(beeper->pwm, &state);

	state.enabled = true;
	state.period = period;
	pwm_set_relative_duty_cycle(&state, 50, 100);

	error = pwm_apply_state(beeper->pwm, &state);
	if (error)
		return error;

	if (!beeper->amplifier_on) {
		error = regulator_enable(beeper->amplifier);
		if (error) {
			pwm_disable(beeper->pwm);
			return error;
		}

		beeper->amplifier_on = true;
	}

	return 0;
}

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David Lechner
60
51.72%
1
33.33%
Dmitry Torokhov
31
26.72%
1
33.33%
Manfred Schlaegl
25
21.55%
1
33.33%
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116
100.00%
3
100.00%



static void pwm_beeper_off(struct pwm_beeper *beeper)
{
	if (beeper->amplifier_on) {
		regulator_disable(beeper->amplifier);
		beeper->amplifier_on = false;
	}

	pwm_disable(beeper->pwm);
}

Contributors
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Tokens
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Commits
CommitProp
David Lechner
30
76.92%
1
50.00%
Manfred Schlaegl
9
23.08%
1
50.00%
Total
39
100.00%
2
100.00%



static void pwm_beeper_work(struct work_struct *work)
{
	struct pwm_beeper *beeper = container_of(work, struct pwm_beeper, work);
	unsigned long period = READ_ONCE(beeper->period);

	if (period)
		pwm_beeper_on(beeper, period);
	else
		pwm_beeper_off(beeper);
}

Contributors
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Tokens
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Commits
CommitProp
Manfred Schlaegl
30
55.56%
1
50.00%
David Lechner
24
44.44%
1
50.00%
Total
54
100.00%
2
100.00%



static int pwm_beeper_event(struct input_dev *input,
			    unsigned int type, unsigned int code, int value)
{
	struct pwm_beeper *beeper = input_get_drvdata(input);

	if (type != EV_SND || value < 0)
		return -EINVAL;

	switch (code) {
	case SND_BELL:
		value = value ? beeper->bell_frequency : 0;
		break;
	case SND_TONE:
		break;
	default:
		return -EINVAL;
	}

	if (value == 0)
		beeper->period = 0;
	else
		beeper->period = HZ_TO_NANOSECONDS(value);

	if (!beeper->suspended)
		schedule_work(&beeper->work);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lars-Peter Clausen
95
82.61%
1
25.00%
Manfred Schlaegl
10
8.70%
1
25.00%
Dmitry Torokhov
7
6.09%
1
25.00%
Guan Ben Guan
3
2.61%
1
25.00%
Total
115
100.00%
4
100.00%



static void pwm_beeper_stop(struct pwm_beeper *beeper)
{
	cancel_work_sync(&beeper->work);
	pwm_beeper_off(beeper);
}

Contributors
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Tokens
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CommitProp
Manfred Schlaegl
16
66.67%
1
33.33%
Lars-Peter Clausen
7
29.17%
1
33.33%
David Lechner
1
4.17%
1
33.33%
Total
24
100.00%
3
100.00%



static void pwm_beeper_close(struct input_dev *input)
{
	struct pwm_beeper *beeper = input_get_drvdata(input);

	pwm_beeper_stop(beeper);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Manfred Schlaegl
25
96.15%
1
50.00%
Lars-Peter Clausen
1
3.85%
1
50.00%
Total
26
100.00%
2
100.00%



static int pwm_beeper_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct pwm_beeper *beeper;
	struct pwm_state state;
	u32 bell_frequency;
	int error;

	beeper = devm_kzalloc(dev, sizeof(*beeper), GFP_KERNEL);
	if (!beeper)
		return -ENOMEM;

	beeper->pwm = devm_pwm_get(dev, NULL);
	if (IS_ERR(beeper->pwm)) {
		error = PTR_ERR(beeper->pwm);
		if (error != -EPROBE_DEFER)
			dev_err(dev, "Failed to request PWM device: %d\n",
				error);
		return error;
	}

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

	beeper->amplifier = devm_regulator_get(dev, "amp");
	if (IS_ERR(beeper->amplifier)) {
		error = PTR_ERR(beeper->amplifier);
		if (error != -EPROBE_DEFER)
			dev_err(dev, "Failed to get 'amp' regulator: %d\n",
				error);
		return error;
	}

	INIT_WORK(&beeper->work, pwm_beeper_work);

	error = device_property_read_u32(dev, "beeper-hz", &bell_frequency);
	if (error) {
		bell_frequency = 1000;
		dev_dbg(dev,
			"failed to parse 'beeper-hz' property, using default: %uHz\n",
			bell_frequency);
	}

	beeper->bell_frequency = bell_frequency;

	beeper->input = devm_input_allocate_device(dev);
	if (!beeper->input) {
		dev_err(dev, "Failed to allocate input device\n");
		return -ENOMEM;
	}

	beeper->input->name = "pwm-beeper";
	beeper->input->phys = "pwm/input0";
	beeper->input->id.bustype = BUS_HOST;
	beeper->input->id.vendor = 0x001f;
	beeper->input->id.product = 0x0001;
	beeper->input->id.version = 0x0100;

	input_set_capability(beeper->input, EV_SND, SND_TONE);
	input_set_capability(beeper->input, EV_SND, SND_BELL);

	beeper->input->event = pwm_beeper_event;
	beeper->input->close = pwm_beeper_close;

	input_set_drvdata(beeper->input, beeper);

	error = input_register_device(beeper->input);
	if (error) {
		dev_err(dev, "Failed to register input device: %d\n", error);
		return error;
	}

	platform_set_drvdata(pdev, beeper);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lars-Peter Clausen
205
48.46%
1
10.00%
Dmitry Torokhov
81
19.15%
3
30.00%
David Lechner
57
13.48%
2
20.00%
Guan Ben Guan
40
9.46%
1
10.00%
Manfred Schlaegl
18
4.26%
1
10.00%
Sascha Hauer
16
3.78%
1
10.00%
Boris Brezillon
6
1.42%
1
10.00%
Total
423
100.00%
10
100.00%



static int __maybe_unused pwm_beeper_suspend(struct device *dev)
{
	struct pwm_beeper *beeper = dev_get_drvdata(dev);

	/*
         * Spinlock is taken here is not to protect write to
         * beeper->suspended, but to ensure that pwm_beeper_event
         * does not re-submit work once flag is set.
         */
	spin_lock_irq(&beeper->input->event_lock);
	beeper->suspended = true;
	spin_unlock_irq(&beeper->input->event_lock);

	pwm_beeper_stop(beeper);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lars-Peter Clausen
28
49.12%
1
25.00%
Dmitry Torokhov
27
47.37%
1
25.00%
Jingoo Han
1
1.75%
1
25.00%
Manfred Schlaegl
1
1.75%
1
25.00%
Total
57
100.00%
4
100.00%



static int __maybe_unused pwm_beeper_resume(struct device *dev)
{
	struct pwm_beeper *beeper = dev_get_drvdata(dev);

	spin_lock_irq(&beeper->input->event_lock);
	beeper->suspended = false;
	spin_unlock_irq(&beeper->input->event_lock);

	/* Let worker figure out if we should resume beeping */
	schedule_work(&beeper->work);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lars-Peter Clausen
30
50.00%
1
33.33%
Dmitry Torokhov
29
48.33%
1
33.33%
Jingoo Han
1
1.67%
1
33.33%
Total
60
100.00%
3
100.00%

static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops,
			 pwm_beeper_suspend, pwm_beeper_resume);

#ifdef CONFIG_OF

static const struct of_device_id pwm_beeper_match[] = {
	{ .compatible = "pwm-beeper", },
	{ },
};
MODULE_DEVICE_TABLE(of, pwm_beeper_match);
#endif


static struct platform_driver pwm_beeper_driver = {
	.probe	= pwm_beeper_probe,
	.driver = {
		.name	= "pwm-beeper",
		.pm	= &pwm_beeper_pm_ops,
		.of_match_table = of_match_ptr(pwm_beeper_match),
        },
};

module_platform_driver(pwm_beeper_driver);

MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("PWM beeper driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pwm-beeper");
Overall Contributors
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Tokens
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Commits
CommitProp
Lars-Peter Clausen
471
43.17%
1
6.25%
David Lechner
183
16.77%
2
12.50%
Dmitry Torokhov
180
16.50%
5
31.25%
Manfred Schlaegl
141
12.92%
1
6.25%
Guan Ben Guan
50
4.58%
1
6.25%
Sascha Hauer
45
4.12%
1
6.25%
Luis de Bethencourt
7
0.64%
1
6.25%
Boris Brezillon
6
0.55%
1
6.25%
Jingoo Han
4
0.37%
1
6.25%
Sachin Kamat
3
0.27%
1
6.25%
JJ Ding
1
0.09%
1
6.25%
Total
1091
100.00%
16
100.00%
Directory: drivers/input/misc

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