This patch adds a new driver for the beeper controlled via GPIO pin.
The driver does not depend on the architecture and is positioned as
a replacement for the specific drivers that are used for this function,
for example drivers/input/misc/ixp4xx-beeper.
Since this patch is RFC only, inline comments are welcome.
---
drivers/input/misc/Kconfig | 6 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/gpio-beeper.c | 156 +++++++++++++++++++++++
include/linux/platform_data/input-gpio-beeper.h | 20 +++
4 files changed, 183 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/misc/gpio-beeper.c
create mode 100644 include/linux/platform_data/input-gpio-beeper.h
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 259ef31..549af80 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -222,6 +222,12 @@ config INPUT_GP2A
To compile this driver as a module, choose M here: the
module will be called gp2ap002a00f.
+config INPUT_GPIO_BEEPER
+ tristate "Generic GPIO beeper support"
+ depends on GPIOLIB
+ help
+ Say Y here if you have a beeper connected to the GPIO pin.
+
config INPUT_GPIO_TILT_POLLED
tristate "Polled GPIO tilt switch"
depends on GENERIC_GPIO
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 1f1e1b1..8234854 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_INPUT_DA9052_ONKEY) += da9052_onkey.o
obj-$(CONFIG_INPUT_DA9055_ONKEY) += da9055_onkey.o
obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o
obj-$(CONFIG_INPUT_GP2A) += gp2ap002a00f.o
+obj-$(CONFIG_INPUT_GPIO_BEEPER) += gpio-beeper.o
obj-$(CONFIG_INPUT_GPIO_TILT_POLLED) += gpio_tilt_polled.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
diff --git a/drivers/input/misc/gpio-beeper.c b/drivers/input/misc/gpio-beeper.c
new file mode 100644
index 0000000..6bc2a2c
--- /dev/null
+++ b/drivers/input/misc/gpio-beeper.c
@@ -0,0 +1,156 @@
+/*
+ * Generic GPIO beeper driver
+ *
+ * Copyright (C) 2012 Alexander Shiyan <shc_work@xxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/gpio.h>
+#include <linux/input.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+
+#include <linux/platform_data/input-gpio-beeper.h>
+
+struct gpio_beeper_priv {
+ struct input_dev *input;
+ struct delayed_work work;
+ char phys[32];
+ int gpio_nr;
+ int active_low:1;
+};
+
+static void gpio_beeper_change(struct gpio_beeper_priv *s, int set)
+{
+ gpio_set_value_cansleep(s->gpio_nr, set ^ s->active_low);
+}
+
+static void gpio_beeper_work(struct work_struct *work)
+{
+ struct gpio_beeper_priv *s = container_of(work, struct gpio_beeper_priv,
+ work.work);
+
+ gpio_beeper_change(s, 0);
+}
+
+static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
+ unsigned int code, int value)
+{
+ struct gpio_beeper_priv *s = input_get_drvdata(dev);
+
+ if ((type != EV_SND) || (code != SND_BELL))
+ return -ENOTSUPP;
+
+ if (value < 0)
+ return -EINVAL;
+
+ if (!value)
+ value = 1000;
+
+ /* Turning beeper ON */
+ gpio_beeper_change(s, 1);
+ /* Schedule work for turning OFF */
+ mod_delayed_work(system_wq, &s->work, msecs_to_jiffies(value));
+
+ return 0;
+}
+
+static int gpio_beeper_probe(struct platform_device *pdev)
+{
+ struct gpio_beeper_pdata *pdata = dev_get_platdata(&pdev->dev);
+ struct gpio_beeper_priv *s;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "Missing platform data\n");
+ return -EINVAL;
+ }
+
+ if (!gpio_is_valid(pdata->gpio_nr)) {
+ dev_err(&pdev->dev, "Invalid gpio %i\n", pdata->gpio_nr);
+ return -EINVAL;
+ }
+
+ s = devm_kzalloc(&pdev->dev, sizeof(struct gpio_beeper_priv),
+ GFP_KERNEL);
+ if (!s) {
+ dev_err(&pdev->dev, "Memory allocate error\n");
+ return -ENOMEM;
+ }
+
+ s->gpio_nr = pdata->gpio_nr;
+ s->active_low = pdata->active_low;
+
+ s->input = devm_input_allocate_device(&pdev->dev);
+ if (!s->input) {
+ dev_err(&pdev->dev, "Input device allocate error\n");
+ return -ENOMEM;
+ }
+
+ snprintf(s->phys, sizeof(s->phys), "%s/input0",
+ pdata->name ? pdata->name : dev_name(&pdev->dev));
+ s->input->dev.parent = &pdev->dev;
+ s->input->name = dev_name(&pdev->dev);
+ s->input->phys = s->phys;
+ s->input->id.bustype = BUS_HOST;
+ s->input->id.vendor = 0x0001;
+ s->input->id.product = 0x0001;
+ s->input->id.version = 0x0100;
+ s->input->evbit[0] = BIT(EV_SND);
+ s->input->sndbit[0] = BIT(SND_BELL);
+ s->input->event = gpio_beeper_event;
+
+ if (devm_gpio_request(&pdev->dev, s->gpio_nr, s->input->name)) {
+ dev_err(&pdev->dev, "Unable to claim gpio %i\n", s->gpio_nr);
+ return -EBUSY;
+ }
+
+ gpio_direction_output(s->gpio_nr, s->active_low);
+
+ input_set_drvdata(s->input, s);
+ platform_set_drvdata(pdev, s);
+
+ INIT_DELAYED_WORK(&s->work, gpio_beeper_work);
+
+ return input_register_device(s->input);
+}
+
+static int gpio_beeper_remove(struct platform_device *pdev)
+{
+ struct gpio_beeper_priv *s = platform_get_drvdata(pdev);
+
+ input_unregister_device(s->input);
+ cancel_delayed_work_sync(&s->work);
+ gpio_beeper_change(s, 0);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static void gpio_beeper_shutdown(struct platform_device *pdev)
+{
+ struct gpio_beeper_priv *s = platform_get_drvdata(pdev);
+
+ /* Turning OFF immediately */
+ flush_delayed_work(&s->work);
+}
+
+static struct platform_driver gpio_beeper_platform_driver = {
+ .driver = {
+ .name = "gpio-beeper",
+ .owner = THIS_MODULE,
+ },
+ .probe = gpio_beeper_probe,
+ .remove = gpio_beeper_remove,
+ .shutdown = gpio_beeper_shutdown,
+};
+module_platform_driver(gpio_beeper_platform_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Shiyan <shc_work@xxxxxxx>");
+MODULE_DESCRIPTION("Generic GPIO beeper driver");
diff --git a/include/linux/platform_data/input-gpio-beeper.h b/include/linux/platform_data/input-gpio-beeper.h
new file mode 100644
index 0000000..9eb4362
--- /dev/null
+++ b/include/linux/platform_data/input-gpio-beeper.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2012 Alexander Shiyan <shc_work@xxxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef __PLATFORM_DATA_INPUT_GPIO_BEEPER_H_
+#define __PLATFORM_DATA_INPUT_GPIO_BEEPER_H_
+
+/* gpio-beeper platform data structure */
+struct gpio_beeper_pdata {
+ const char *name; /* Name of device (Optional) */
+ int gpio_nr; /* GPIO number */
+ int active_low:1; /* Set if active level is LOW */
+};
+
+#endif
--
1.7.8.6
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