Input: gpio-keys - keyboard driver for GPIO buttons

This is an interrupt-driven keyboard driver for simple buttons
connected directly to CPU GPIO lines of embedded ARM systems.
It supports pxa architectures and is used by a number of PDAs
and PocketPC phones in the handhelds.org kernel. Support for
other architectures, such as sa11xx and sc2410, will be added
once generic GPIO API is available.

Signed-off-by: Paul Sokolovsky <pmiscml@gmail.com>
Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 049f2f544e75e94a9d40aee991df4cf8d45510f4..1b81a72e19d92c7fc7bdfa41a215cbda7039d9a7 100644 (file)
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -135,12 +135,12 @@ config KEYBOARD_STOWAWAY
 config KEYBOARD_CORGI
        tristate "Corgi keyboard"
        depends on PXA_SHARPSL
-       default y       
+       default y
        help
-         Say Y here to enable the keyboard on the Sharp Zaurus SL-C7xx 
+         Say Y here to enable the keyboard on the Sharp Zaurus SL-C7xx
          series of PDAs.
 
-         To compile this driver as a module, choose M here: the 
+         To compile this driver as a module, choose M here: the
          module will be called corgikbd.
 
 config KEYBOARD_SPITZ
@@ -214,4 +214,17 @@ config KEYBOARD_AAED2000
          To compile this driver as a module, choose M here: the
          module will be called aaed2000_kbd.
 
+config KEYBOARD_GPIO
+        tristate "Buttons on CPU GPIOs (PXA)"
+        depends on ARCH_PXA
+       help
+         This driver implements support for buttons connected
+         directly to GPIO pins of PXA CPUs.
+
+         Say Y here if your device has buttons connected
+         directly to GPIO pins of the CPU.
+
+         To compile this driver as a module, choose M here: the
+         module will be called gpio-keys.
+
 endif

diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 568797907347b9e0ace4898ab425e8a9ba16683d..586a0fe53be604bc1e67c6001b98df90e99b7e2f 100644 (file)
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_KEYBOARD_CORGI)          += corgikbd.o
 obj-$(CONFIG_KEYBOARD_SPITZ)           += spitzkbd.o
 obj-$(CONFIG_KEYBOARD_HIL)             += hil_kbd.o
 obj-$(CONFIG_KEYBOARD_HIL_OLD)         += hilkbd.o
-obj-$(CONFIG_KEYBOARD_OMAP)             += omap-keypad.o
-obj-$(CONFIG_KEYBOARD_AAED2000)         += aaed2000_kbd.o
+obj-$(CONFIG_KEYBOARD_OMAP)            += omap-keypad.o
+obj-$(CONFIG_KEYBOARD_AAED2000)                += aaed2000_kbd.o
+obj-$(CONFIG_KEYBOARD_GPIO)            += gpio_keys.o
 

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
new file mode 100644 (file)
index 0000000..3a8f1b4
--- /dev/null
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -0,0 +1,147 @@
+/*
+ * Driver for keys on GPIO lines capable of generating interrupts.
+ *
+ * Copyright 2005 Phil Blundell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/pm.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/hardware.h>
+
+#include <asm/hardware/gpio_keys.h>
+
+static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
+{
+       int i;
+       struct platform_device *pdev = dev_id;
+       struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
+       struct input_dev *input = platform_get_drvdata(pdev);
+
+       for (i = 0; i < pdata->nbuttons; i++) {
+               int gpio = pdata->buttons[i].gpio;
+               if (irq == IRQ_GPIO(gpio)) {
+                       int state = ((GPLR(gpio) & GPIO_bit(gpio)) ? 1 : 0) ^ (pdata->buttons[i].active_low);
+
+                       input_report_key(input, pdata->buttons[i].keycode, state);
+                       input_sync(input);
+               }
+       }
+
+       return IRQ_HANDLED;
+}
+
+static int __devinit gpio_keys_probe(struct platform_device *pdev)
+{
+       struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
+       struct input_dev *input;
+       int i, error;
+
+       input = input_allocate_device();
+       if (!input)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, input);
+
+       input->evbit[0] = BIT(EV_KEY);
+
+       input->name = pdev->name;
+       input->phys = "gpio-keys/input0";
+       input->cdev.dev = &pdev->dev;
+       input->private = pdata;
+
+       input->id.bustype = BUS_HOST;
+       input->id.vendor = 0x0001;
+       input->id.product = 0x0001;
+       input->id.version = 0x0100;
+
+       for (i = 0; i < pdata->nbuttons; i++) {
+               int code = pdata->buttons[i].keycode;
+               int irq = IRQ_GPIO(pdata->buttons[i].gpio);
+
+               set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
+               error = request_irq(irq, gpio_keys_isr, SA_SAMPLE_RANDOM,
+                                    pdata->buttons[i].desc ? pdata->buttons[i].desc : "gpio_keys",
+                                    pdev);
+               if (error) {
+                       printk(KERN_ERR "gpio-keys: unable to claim irq %d; error %d\n", irq, ret);
+                       goto fail;
+               }
+               set_bit(code, input->keybit);
+       }
+
+       error = input_register_device(input);
+       if (error) {
+               printk(KERN_ERR "Unable to register gpio-keys input device\n");
+               goto fail;
+       }
+
+       return 0;
+
+ fail:
+       for (i = i - 1; i >= 0; i--)
+               free_irq(IRQ_GPIO(pdata->buttons[i].gpio), pdev);
+
+       input_free_device(input);
+
+       return error;
+}
+
+static int __devexit gpio_keys_remove(struct platform_device *pdev)
+{
+       struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
+       struct input_dev *input = platform_get_drvdata(pdev);
+       int i;
+
+       for (i = 0; i < pdata->nbuttons; i++) {
+               int irq = IRQ_GPIO(pdata->buttons[i].gpio);
+               free_irq(irq, pdev);
+       }
+
+       input_unregister_device(input);
+
+       return 0;
+}
+
+struct platform_driver gpio_keys_device_driver = {
+       .probe          = gpio_keys_probe,
+       .remove         = __devexit_p(gpio_keys_remove),
+       .driver         = {
+               .name   = "gpio-keys",
+       }
+};
+
+static int __init gpio_keys_init(void)
+{
+       return platform_driver_register(&gpio_keys_device_driver);
+}
+
+static void __exit gpio_keys_exit(void)
+{
+       platform_driver_unregister(&gpio_keys_device_driver);
+}
+
+module_init(gpio_keys_init);
+module_exit(gpio_keys_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
+MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs");

diff --git a/include/asm-arm/hardware/gpio_keys.h b/include/asm-arm/hardware/gpio_keys.h
new file mode 100644 (file)
index 0000000..2b217c7
--- /dev/null
+++ b/include/asm-arm/hardware/gpio_keys.h
@@ -0,0 +1,17 @@
+#ifndef _GPIO_KEYS_H
+#define _GPIO_KEYS_H
+
+struct gpio_keys_button {
+       /* Configuration parameters */
+       int keycode;
+       int gpio;
+       int active_low;
+       char *desc;
+};
+
+struct gpio_keys_platform_data {
+       struct gpio_keys_button *buttons;
+       int nbuttons;
+};
+
+#endif