250 lines
6.4 KiB
Diff
250 lines
6.4 KiB
Diff
From d7894c598e2c1e5c1d173ca808694de523f1a06a Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Wed, 14 Jul 2010 00:25:21 -0700
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Subject: [PATCH] Input: Add pwm beeper driver
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This patch adds a simple driver which allows to use pwm based beepers (for
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example piezo elements) as a pcspkr-like device.
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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---
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drivers/input/misc/Kconfig | 11 ++
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drivers/input/misc/Makefile | 1 +
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drivers/input/misc/pwm-beeper.c | 199 +++++++++++++++++++++++++++++++++++++++
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3 files changed, 211 insertions(+), 0 deletions(-)
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create mode 100644 drivers/input/misc/pwm-beeper.c
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--- a/drivers/input/misc/Kconfig
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+++ b/drivers/input/misc/Kconfig
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@@ -327,6 +327,17 @@ config INPUT_PCF8574
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To compile this driver as a module, choose M here: the
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module will be called pcf8574_keypad.
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+config INPUT_PWM_BEEPER
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+ tristate "PWM beeper support"
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+ depends on HAVE_PWM
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+ help
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+ Say Y here to get support for PWM based beeper devices.
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+
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+ If unsure, say N.
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+
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+ To compile this driver as a module, choose M here: the module will be
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+ called pwm-beeper.
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+
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config INPUT_GPIO_ROTARY_ENCODER
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tristate "Rotary encoders connected to GPIO pins"
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depends on GPIOLIB && GENERIC_GPIO
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--- a/drivers/input/misc/Makefile
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+++ b/drivers/input/misc/Makefile
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@@ -26,6 +26,7 @@ obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf5
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obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o
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obj-$(CONFIG_INPUT_PCSPKR) += pcspkr.o
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obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
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+obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o
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obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
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obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
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obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
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--- /dev/null
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+++ b/drivers/input/misc/pwm-beeper.c
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@@ -0,0 +1,199 @@
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+/*
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+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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+ * PWM beeper driver
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#include <linux/input.h>
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+#include <linux/module.h>
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+#include <linux/kernel.h>
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+#include <linux/platform_device.h>
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+#include <linux/pwm.h>
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+#include <linux/slab.h>
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+
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+struct pwm_beeper {
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+ struct input_dev *input;
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+ struct pwm_device *pwm;
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+ unsigned long period;
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+};
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+
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+#define HZ_TO_NANOSECONDS(x) (1000000000UL/(x))
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+
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+static int pwm_beeper_event(struct input_dev *input,
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+ unsigned int type, unsigned int code, int value)
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+{
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+ int ret = 0;
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+ struct pwm_beeper *beeper = input_get_drvdata(input);
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+ unsigned long period;
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+
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+ if (type != EV_SND || value < 0)
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+ return -EINVAL;
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+
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+ switch (code) {
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+ case SND_BELL:
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+ value = value ? 1000 : 0;
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+ break;
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+ case SND_TONE:
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+ break;
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+ default:
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+ return -EINVAL;
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+ }
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+
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+ if (value == 0) {
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+ pwm_config(beeper->pwm, 0, 0);
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+ pwm_disable(beeper->pwm);
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+ } else {
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+ period = HZ_TO_NANOSECONDS(value);
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+ ret = pwm_config(beeper->pwm, period / 2, period);
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+ if (ret)
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+ return ret;
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+ ret = pwm_enable(beeper->pwm);
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+ if (ret)
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+ return ret;
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+ beeper->period = period;
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+ }
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+
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+ return 0;
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+}
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+
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+static int __devinit pwm_beeper_probe(struct platform_device *pdev)
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+{
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+ unsigned long pwm_id = (unsigned long)pdev->dev.platform_data;
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+ struct pwm_beeper *beeper;
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+ int error;
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+
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+ beeper = kzalloc(sizeof(*beeper), GFP_KERNEL);
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+ if (!beeper)
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+ return -ENOMEM;
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+
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+ beeper->pwm = pwm_request(pwm_id, "pwm beeper");
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+
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+ if (IS_ERR(beeper->pwm)) {
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+ error = PTR_ERR(beeper->pwm);
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+ dev_err(&pdev->dev, "Failed to request pwm device: %d\n", error);
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+ goto err_free;
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+ }
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+
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+ beeper->input = input_allocate_device();
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+ if (!beeper->input) {
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+ dev_err(&pdev->dev, "Failed to allocate input device\n");
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+ error = -ENOMEM;
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+ goto err_pwm_free;
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+ }
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+ beeper->input->dev.parent = &pdev->dev;
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+
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+ beeper->input->name = "pwm-beeper";
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+ beeper->input->phys = "pwm/input0";
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+ beeper->input->id.bustype = BUS_HOST;
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+ beeper->input->id.vendor = 0x001f;
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+ beeper->input->id.product = 0x0001;
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+ beeper->input->id.version = 0x0100;
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+
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+ beeper->input->evbit[0] = BIT(EV_SND);
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+ beeper->input->sndbit[0] = BIT(SND_TONE) | BIT(SND_BELL);
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+
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+ beeper->input->event = pwm_beeper_event;
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+
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+ input_set_drvdata(beeper->input, beeper);
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+
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+ error = input_register_device(beeper->input);
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+ if (error) {
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+ dev_err(&pdev->dev, "Failed to register input device: %d\n", error);
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+ goto err_input_free;
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+ }
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+
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+ platform_set_drvdata(pdev, beeper);
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+
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+ return 0;
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+
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+err_input_free:
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+ input_free_device(beeper->input);
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+err_pwm_free:
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+ pwm_free(beeper->pwm);
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+err_free:
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+ kfree(beeper);
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+
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+ return error;
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+}
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+
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+static int __devexit pwm_beeper_remove(struct platform_device *pdev)
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+{
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+ struct pwm_beeper *beeper = platform_get_drvdata(pdev);
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+
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+ platform_set_drvdata(pdev, NULL);
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+ input_unregister_device(beeper->input);
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+
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+ pwm_disable(beeper->pwm);
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+ pwm_free(beeper->pwm);
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+
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+ kfree(beeper);
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_PM
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+static int pwm_beeper_suspend(struct device *dev)
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+{
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+ struct pwm_beeper *beeper = dev_get_drvdata(dev);
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+
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+ if (beeper->period)
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+ pwm_disable(beeper->pwm);
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+
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+ return 0;
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+}
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+
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+static int pwm_beeper_resume(struct device *dev)
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+{
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+ struct pwm_beeper *beeper = dev_get_drvdata(dev);
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+
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+ if (beeper->period) {
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+ pwm_config(beeper->pwm, beeper->period / 2, beeper->period);
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+ pwm_enable(beeper->pwm);
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+ }
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+
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+ return 0;
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+}
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+
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+static SIMPLE_DEV_PM_OPS(pwm_beeper_pm_ops,
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+ pwm_beeper_suspend, pwm_beeper_resume);
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+
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+#define PWM_BEEPER_PM_OPS (&pwm_beeper_pm_ops)
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+#else
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+#define PWM_BEEPER_PM_OPS NULL
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+#endif
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+
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+static struct platform_driver pwm_beeper_driver = {
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+ .probe = pwm_beeper_probe,
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+ .remove = __devexit_p(pwm_beeper_remove),
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+ .driver = {
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+ .name = "pwm-beeper",
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+ .owner = THIS_MODULE,
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+ .pm = PWM_BEEPER_PM_OPS,
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+ },
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+};
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+
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+static int __init pwm_beeper_init(void)
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+{
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+ return platform_driver_register(&pwm_beeper_driver);
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+}
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+module_init(pwm_beeper_init);
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+
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+static void __exit pwm_beeper_exit(void)
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+{
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+ platform_driver_unregister(&pwm_beeper_driver);
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+}
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+module_exit(pwm_beeper_exit);
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+
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+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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+MODULE_DESCRIPTION("PWM beeper driver");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("platform:pwm-beeper");
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