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.
Signed-off-by: Alexander Shiyan <shc_work@xxxxxxx>
---
.../devicetree/bindings/input/gpio-beeper.txt | 13 +++
drivers/input/misc/Kconfig | 9 ++
drivers/input/misc/Makefile | 1 +
drivers/input/misc/gpio-beeper.c | 127 +++++++++++++++++++++
4 files changed, 150 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/gpio-beeper.txt
create mode 100644 drivers/input/misc/gpio-beeper.c
diff --git a/Documentation/devicetree/bindings/input/gpio-beeper.txt b/Documentation/devicetree/bindings/input/gpio-beeper.txt
new file mode 100644
index 0000000..a5086e3
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/gpio-beeper.txt
@@ -0,0 +1,13 @@
+* GPIO beeper device tree bindings
+
+Register a beeper connected to GPIO pin.
+
+Required properties:
+- compatible: Should be "gpio-beeper".
+- gpios: From common gpio binding; gpio connection to beeper enable pin.
+
+Example:
+ beeper: beeper {
+ compatible = "gpio-beeper";
+ gpios = <&gpio3 23 GPIO_ACTIVE_HIGH>;
+ };
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 5f4967d..4ffc397 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -222,6 +222,15 @@ 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 OF_GPIO
+ help
+ Say Y here if you have a beeper connected to a GPIO pin.
+
+ To compile this driver as a module, choose M here: the
+ module will be called gpio-beeper.
+
config INPUT_GPIO_TILT_POLLED
tristate "Polled GPIO tilt switch"
depends on GPIOLIB
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 0ebfb6d..cda71fc 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_IMS_PCU) += ims-pcu.o
diff --git a/drivers/input/misc/gpio-beeper.c b/drivers/input/misc/gpio-beeper.c
new file mode 100644
index 0000000..cc81e6e
--- /dev/null
+++ b/drivers/input/misc/gpio-beeper.c
@@ -0,0 +1,127 @@
+/*
+ * Generic GPIO beeper driver
+ *
+ * Copyright (C) 2013 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/input.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+
+#define BEEPER_MODNAME "gpio-beeper"
+
+struct gpio_beeper {
+ struct work_struct work;
+ int gpio;
+ bool active_low;
+ bool beeping;
+};
+
+static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
+{
+ gpio_set_value_cansleep(beep->gpio, on ^ beep->active_low);
+}
+
+static void gpio_beeper_work(struct work_struct *work)
+{
+ struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
+
+ gpio_beeper_toggle(beep, beep->beeping);
+}
+
+static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
+ unsigned int code, int value)
+{
+ struct gpio_beeper *beep = input_get_drvdata(dev);
+
+ if (type != EV_SND || code != SND_BELL)
+ return -ENOTSUPP;
+
+ if (value < 0)
+ return -EINVAL;
+
+ beep->beeping = value;
+ /* Schedule work to actually turn the beeper on or off */
+ schedule_work(&beep->work);
+
+ return 0;
+}
+
+static void gpio_beeper_close(struct input_dev *input)
+{
+ struct gpio_beeper *beep = input_get_drvdata(input);
+
+ cancel_work_sync(&beep->work);
+ gpio_beeper_toggle(beep, false);
+}
+
+static int gpio_beeper_probe(struct platform_device *pdev)
+{
+ struct gpio_beeper *beep;
+ enum of_gpio_flags flags;
+ struct input_dev *input;
+ unsigned long gflags;
+ int err;
+
+ beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
+ if (!beep)
+ return -ENOMEM;
+
+ beep->gpio = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
+ if (!gpio_is_valid(beep->gpio))
+ return beep->gpio;
+
+ input = devm_input_allocate_device(&pdev->dev);
+ if (!input)
+ return -ENOMEM;
+
+ INIT_WORK(&beep->work, gpio_beeper_work);
+
+ input->name = pdev->name;
+ input->id.bustype = BUS_HOST;
+ input->id.vendor = 0x0001;
+ input->id.product = 0x0001;
+ input->id.version = 0x0100;
+ input->close = gpio_beeper_close;
+ input->event = gpio_beeper_event;
+
+ input_set_capability(input, EV_SND, SND_BELL);
+
+ beep->active_low = flags & OF_GPIO_ACTIVE_LOW;
+ gflags = beep->active_low ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
+
+ err = devm_gpio_request_one(&pdev->dev, beep->gpio, gflags, pdev->name);
+ if (err)
+ return err;
+
+ input_set_drvdata(input, beep);
+
+ return input_register_device(input);
+}
+
+static struct of_device_id gpio_beeper_of_match[] = {
+ { .compatible = BEEPER_MODNAME, },
+ { }
+};
+MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
+
+static struct platform_driver gpio_beeper_platform_driver = {
+ .driver = {
+ .name = BEEPER_MODNAME,
+ .owner = THIS_MODULE,
+ .of_match_table = gpio_beeper_of_match,
+ },
+ .probe = gpio_beeper_probe,
+};
+module_platform_driver(gpio_beeper_platform_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Shiyan <shc_work@xxxxxxx>");
+MODULE_DESCRIPTION("Generic GPIO beeper driver");
--
1.8.3.2
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