Input: Add pwm beeper driver (e22739d0) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/input/misc/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -327,6 +327,17 @@ config INPUT_PCF8574
		To compile this driver as a module, choose M here: the
		module will be called pcf8574_keypad.

		config INPUT_PWM_BEEPER
		tristate "PWM beeper support"
		depends on HAVE_PWM
		help
		Say Y here to get support for PWM based beeper devices.

		If unsure, say N.

		To compile this driver as a module, choose M here: the module will be
		called pwm-beeper.

		config INPUT_GPIO_ROTARY_ENCODER
		tristate "Rotary encoders connected to GPIO pins"
		depends on GPIOLIB && GENERIC_GPIO

drivers/input/misc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@ obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
		obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o
		obj-$(CONFIG_INPUT_PCSPKR) += pcspkr.o
		obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
		obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o
		obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
		obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
		obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o

drivers/input/misc/pwm-beeper.c

0 → 100644

+199 −0

Original line number	Diff line number	Diff line
		/*
		* 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/module.h>
		#include <linux/kernel.h>
		#include <linux/platform_device.h>
		#include <linux/pwm.h>
		#include <linux/slab.h>

		struct pwm_beeper {
		struct input_dev *input;
		struct pwm_device *pwm;
		unsigned long period;
		};

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

		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;

		switch (code) {
		case SND_BELL:
		value = value ? 1000 : 0;
		break;
		case SND_TONE:
		break;
		default:
		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;
		}

		return 0;
		}

		static int __devinit pwm_beeper_probe(struct platform_device *pdev)
		{
		unsigned long pwm_id = (unsigned long)pdev->dev.platform_data;
		struct pwm_beeper *beeper;
		int error;

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

		beeper->pwm = pwm_request(pwm_id, "pwm beeper");

		if (IS_ERR(beeper->pwm)) {
		error = PTR_ERR(beeper->pwm);
		dev_err(&pdev->dev, "Failed to request pwm device: %d\n", error);
		goto err_free;
		}

		beeper->input = input_allocate_device();
		if (!beeper->input) {
		dev_err(&pdev->dev, "Failed to allocate input device\n");
		error = -ENOMEM;
		goto err_pwm_free;
		}
		beeper->input->dev.parent = &pdev->dev;

		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;

		beeper->input->evbit[0] = BIT(EV_SND);
		beeper->input->sndbit[0] = BIT(SND_TONE) \| BIT(SND_BELL);

		beeper->input->event = pwm_beeper_event;

		input_set_drvdata(beeper->input, beeper);

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

		platform_set_drvdata(pdev, beeper);

		return 0;

		err_input_free:
		input_free_device(beeper->input);
		err_pwm_free:
		pwm_free(beeper->pwm);
		err_free:
		kfree(beeper);

		return error;
		}

		static int __devexit pwm_beeper_remove(struct platform_device *pdev)
		{
		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);

		return 0;
		}

		#ifdef CONFIG_PM
		static int pwm_beeper_suspend(struct device *dev)
		{
		struct pwm_beeper *beeper = dev_get_drvdata(dev);

		if (beeper->period)
		pwm_disable(beeper->pwm);

		return 0;
		}

		static int 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);
		}

		return 0;
		}

		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

		static struct platform_driver pwm_beeper_driver = {
		.probe = pwm_beeper_probe,
		.remove = __devexit_p(pwm_beeper_remove),
		.driver = {
		.name = "pwm-beeper",
		.owner = THIS_MODULE,
		.pm = PWM_BEEPER_PM_OPS,
		},
		};

		static int __init pwm_beeper_init(void)
		{
		return platform_driver_register(&pwm_beeper_driver);
		}
		module_init(pwm_beeper_init);

		static void __exit pwm_beeper_exit(void)
		{
		platform_driver_unregister(&pwm_beeper_driver);
		}
		module_exit(pwm_beeper_exit);

		MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
		MODULE_DESCRIPTION("PWM beeper driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:pwm-beeper");