--- zzzz-none-000/linux-3.10.107/drivers/input/misc/pwm-beeper.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/input/misc/pwm-beeper.c	2021-02-04 17:41:59.000000000 +0000
@@ -16,24 +16,44 @@
 #include <linux/input.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
+#include <linux/of.h>
 #include <linux/platform_device.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 work_struct work;
 	unsigned long period;
 };
 
 #define HZ_TO_NANOSECONDS(x) (1000000000UL/(x))
 
+static void __pwm_beeper_set(struct pwm_beeper *beeper)
+{
+	unsigned long period = beeper->period;
+
+	if (period) {
+		pwm_config(beeper->pwm, period / 2, period);
+		pwm_enable(beeper->pwm);
+	} else
+		pwm_disable(beeper->pwm);
+}
+
+static void pwm_beeper_work(struct work_struct *work)
+{
+	struct pwm_beeper *beeper =
+		container_of(work, struct pwm_beeper, work);
+
+	__pwm_beeper_set(beeper);
+}
+
 static int pwm_beeper_event(struct input_dev *input,
 			    unsigned int type, unsigned int code, int value)
 {
-	int ret = 0;
 	struct pwm_beeper *beeper = input_get_drvdata(input);
-	unsigned long period;
 
 	if (type != EV_SND || value < 0)
 		return -EINVAL;
@@ -48,26 +68,34 @@
 		return -EINVAL;
 	}
 
-	if (value == 0) {
-		pwm_config(beeper->pwm, 0, 0);
-		pwm_disable(beeper->pwm);
-	} else {
-		period = HZ_TO_NANOSECONDS(value);
-		ret = pwm_config(beeper->pwm, period / 2, period);
-		if (ret)
-			return ret;
-		ret = pwm_enable(beeper->pwm);
-		if (ret)
-			return ret;
-		beeper->period = period;
-	}
+	if (value == 0)
+		beeper->period = 0;
+	else
+		beeper->period = HZ_TO_NANOSECONDS(value);
+
+	schedule_work(&beeper->work);
 
 	return 0;
 }
 
+static void pwm_beeper_stop(struct pwm_beeper *beeper)
+{
+	cancel_work_sync(&beeper->work);
+
+	if (beeper->period)
+		pwm_disable(beeper->pwm);
+}
+
+static void pwm_beeper_close(struct input_dev *input)
+{
+	struct pwm_beeper *beeper = input_get_drvdata(input);
+
+	pwm_beeper_stop(beeper);
+}
+
 static int pwm_beeper_probe(struct platform_device *pdev)
 {
-	unsigned long pwm_id = (unsigned long)pdev->dev.platform_data;
+	unsigned long pwm_id = (unsigned long)dev_get_platdata(&pdev->dev);
 	struct pwm_beeper *beeper;
 	int error;
 
@@ -87,6 +115,8 @@
 		goto err_free;
 	}
 
+	INIT_WORK(&beeper->work, pwm_beeper_work);
+
 	beeper->input = input_allocate_device();
 	if (!beeper->input) {
 		dev_err(&pdev->dev, "Failed to allocate input device\n");
@@ -106,6 +136,7 @@
 	beeper->input->sndbit[0] = BIT(SND_TONE) | BIT(SND_BELL);
 
 	beeper->input->event = pwm_beeper_event;
+	beeper->input->close = pwm_beeper_close;
 
 	input_set_drvdata(beeper->input, beeper);
 
@@ -133,10 +164,8 @@
 {
 	struct pwm_beeper *beeper = platform_get_drvdata(pdev);
 
-	platform_set_drvdata(pdev, NULL);
 	input_unregister_device(beeper->input);
 
-	pwm_disable(beeper->pwm);
 	pwm_free(beeper->pwm);
 
 	kfree(beeper);
@@ -144,25 +173,21 @@
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int pwm_beeper_suspend(struct device *dev)
+static int __maybe_unused pwm_beeper_suspend(struct device *dev)
 {
 	struct pwm_beeper *beeper = dev_get_drvdata(dev);
 
-	if (beeper->period)
-		pwm_disable(beeper->pwm);
+	pwm_beeper_stop(beeper);
 
 	return 0;
 }
 
-static int pwm_beeper_resume(struct device *dev)
+static int __maybe_unused pwm_beeper_resume(struct device *dev)
 {
 	struct pwm_beeper *beeper = dev_get_drvdata(dev);
 
-	if (beeper->period) {
-		pwm_config(beeper->pwm, beeper->period / 2, beeper->period);
-		pwm_enable(beeper->pwm);
-	}
+	if (beeper->period)
+		__pwm_beeper_set(beeper);
 
 	return 0;
 }
@@ -170,16 +195,12 @@
 static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops,
 			 pwm_beeper_suspend, pwm_beeper_resume);
 
-#define PWM_BEEPER_PM_OPS (&pwm_beeper_pm_ops)
-#else
-#define PWM_BEEPER_PM_OPS NULL
-#endif
-
 #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 = {
@@ -187,8 +208,7 @@
 	.remove = pwm_beeper_remove,
 	.driver = {
 		.name	= "pwm-beeper",
-		.owner	= THIS_MODULE,
-		.pm	= PWM_BEEPER_PM_OPS,
+		.pm	= &pwm_beeper_pm_ops,
 		.of_match_table = of_match_ptr(pwm_beeper_match),
 	},
 };