input: PCAP2 misc input driver

This is a driver for misc input events for the PCAP2 PMIC, it handles
the Power key and the Headphone button.

Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: Ilya Petrov <ilya.muromec@gmail.com>
Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/input/misc/Kconfig

@@ -289,4 +289,14 @@ config INPUT_WM831X_ON
 	  To compile this driver as a module, choose M here: the module
 	  will be called wm831x_on.
 
+config INPUT_PCAP
+	tristate "Motorola EZX PCAP misc input events"
+	depends on EZX_PCAP
+	help
+	  Say Y here if you want to use Power key and Headphone button
+	  on Motorola EZX phones.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pcap_keys.
+
 endif

drivers/input/misc/Makefile

@@ -16,6 +16,7 @@ obj-$(CONFIG_HP_SDC_RTC)		+= hp_sdc_rtc.o
 obj-$(CONFIG_INPUT_IXP4XX_BEEPER)	+= ixp4xx-beeper.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)	+= keyspan_remote.o
 obj-$(CONFIG_INPUT_M68K_BEEP)		+= m68kspkr.o
+obj-$(CONFIG_INPUT_PCAP)		+= pcap_keys.o
 obj-$(CONFIG_INPUT_PCF50633_PMU)	+= pcf50633-input.o
 obj-$(CONFIG_INPUT_PCSPKR)		+= pcspkr.o
 obj-$(CONFIG_INPUT_POWERMATE)		+= powermate.o
@@ -28,3 +29,4 @@ obj-$(CONFIG_INPUT_UINPUT)		+= uinput.o
 obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
 obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
 obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
+

drivers/input/misc/pcap_keys.c

@@ -0,0 +1,144 @@
+/*
+ *  Input driver for PCAP events:
+ *   * Power key
+ *   * Headphone button
+ *
+ *  Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com>
+ *
+ *  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/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/mfd/ezx-pcap.h>
+
+struct pcap_keys {
+	struct pcap_chip *pcap;
+	struct input_dev *input;
+};
+
+/* PCAP2 interrupts us on keypress */
+static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys)
+{
+	struct pcap_keys *pcap_keys = _pcap_keys;
+	int pirq = irq_to_pcap(pcap_keys->pcap, irq);
+	u32 pstat;
+
+	ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat);
+	pstat &= 1 << pirq;
+
+	switch (pirq) {
+	case PCAP_IRQ_ONOFF:
+		input_report_key(pcap_keys->input, KEY_POWER, !pstat);
+		break;
+	case PCAP_IRQ_MIC:
+		input_report_key(pcap_keys->input, KEY_HP, !pstat);
+		break;
+	}
+
+	input_sync(pcap_keys->input);
+
+	return IRQ_HANDLED;
+}
+
+static int __devinit pcap_keys_probe(struct platform_device *pdev)
+{
+	int err = -ENOMEM;
+	struct pcap_keys *pcap_keys;
+	struct input_dev *input_dev;
+
+	pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL);
+	if (!pcap_keys)
+		return err;
+
+	pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent);
+
+	input_dev = input_allocate_device();
+	if (!input_dev)
+		goto fail;
+
+	pcap_keys->input = input_dev;
+
+	platform_set_drvdata(pdev, pcap_keys);
+	input_dev->name = pdev->name;
+	input_dev->phys = "pcap-keys/input0";
+	input_dev->id.bustype = BUS_HOST;
+	input_dev->dev.parent = &pdev->dev;
+
+	__set_bit(EV_KEY, input_dev->evbit);
+	__set_bit(KEY_POWER, input_dev->keybit);
+	__set_bit(KEY_HP, input_dev->keybit);
+
+	err = input_register_device(input_dev);
+	if (err)
+		goto fail_allocate;
+
+	err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF),
+			pcap_keys_handler, 0, "Power key", pcap_keys);
+	if (err)
+		goto fail_register;
+
+	err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC),
+			pcap_keys_handler, 0, "Headphone button", pcap_keys);
+	if (err)
+		goto fail_pwrkey;
+
+	return 0;
+
+fail_pwrkey:
+	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
+fail_register:
+	input_unregister_device(input_dev);
+	goto fail;
+fail_allocate:
+	input_free_device(input_dev);
+fail:
+	kfree(pcap_keys);
+	return err;
+}
+
+static int __devexit pcap_keys_remove(struct platform_device *pdev)
+{
+	struct pcap_keys *pcap_keys = platform_get_drvdata(pdev);
+
+	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
+	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys);
+
+	input_unregister_device(pcap_keys->input);
+	kfree(pcap_keys);
+
+	return 0;
+}
+
+static struct platform_driver pcap_keys_device_driver = {
+	.probe		= pcap_keys_probe,
+	.remove		= __devexit_p(pcap_keys_remove),
+	.driver		= {
+		.name	= "pcap-keys",
+		.owner	= THIS_MODULE,
+	}
+};
+
+static int __init pcap_keys_init(void)
+{
+	return platform_driver_register(&pcap_keys_device_driver);
+};
+
+static void __exit pcap_keys_exit(void)
+{
+	platform_driver_unregister(&pcap_keys_device_driver);
+};
+
+module_init(pcap_keys_init);
+module_exit(pcap_keys_exit);
+
+MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
+MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcap_keys");