+++ /dev/null
-From d7894c598e2c1e5c1d173ca808694de523f1a06a Mon Sep 17 00:00:00 2001
-From: Lars-Peter Clausen <lars@metafoo.de>
-Date: Wed, 14 Jul 2010 00:25:21 -0700
-Subject: [PATCH] Input: Add pwm beeper driver
-
-This patch adds a simple driver which allows to use pwm based beepers (for
-example piezo elements) as a pcspkr-like device.
-
-Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
-Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
----
- drivers/input/misc/Kconfig | 11 ++
- drivers/input/misc/Makefile | 1 +
- drivers/input/misc/pwm-beeper.c | 199 +++++++++++++++++++++++++++++++++++++++
- 3 files changed, 211 insertions(+), 0 deletions(-)
- create mode 100644 drivers/input/misc/pwm-beeper.c
-
---- a/drivers/input/misc/Kconfig
-+++ b/drivers/input/misc/Kconfig
-@@ -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
---- a/drivers/input/misc/Makefile
-+++ b/drivers/input/misc/Makefile
-@@ -26,6 +26,7 @@ obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf5
- obj-$(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
---- /dev/null
-+++ b/drivers/input/misc/pwm-beeper.c
-@@ -0,0 +1,199 @@
-+/*
-+ * 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");
projects / openwrt.git / blobdiff