Input: add a new driver for GPIO beeper

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@mail.ru>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/gpio-beeper.txt b/Documentation/devicetree/bindings/input/gpio-beeper.txt
new file mode 100644 (file)
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 5f4967d01bc36a621655f64eea7e2c1408ef43b7..4ffc39732513fcd0a20a28d611c2b077ccd0e6bb 100644 (file)
--- 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 0ebfb6dbf0f7788afd75b7a88bd171ff90b567b6..cda71fc52fb3a6bd026bd5edf878f03834996b88 100644 (file)
--- 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 (file)
index 0000000..b757435
--- /dev/null
+++ b/drivers/input/misc/gpio-beeper.c
@@ -0,0 +1,127 @@
+/*
+ * Generic GPIO beeper driver
+ *
+ * Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * 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@mail.ru>");
+MODULE_DESCRIPTION("Generic GPIO beeper driver");