/*
 * Keyboard driver for FIC Neo1973 GSM phone
 *
 * (C) 2006-2007 by OpenMoko, Inc.
 * Author: Harald Welte <laforge@openmoko.org>
 * All rights reserved.
 *
 * inspired by corkgbd.c by Richard Purdie
 *
 * 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/delay.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <asm/hardware.h>
#include <asm/arch/gta01.h>
#include <asm/mach-types.h>

struct neo1973kbd {
	struct input_dev *input;
	unsigned int suspended;
	unsigned long suspend_jiffies;
};

static irqreturn_t neo1973kbd_aux_irq(int irq, void *dev_id)
{
	struct neo1973kbd *neo1973kbd_data = dev_id;

	/* FIXME: use GPIO from platform_dev resources */
	if (s3c2410_gpio_getpin(GTA01_GPIO_AUX_KEY))
		input_report_key(neo1973kbd_data->input, KEY_PHONE, 0);
	else
		input_report_key(neo1973kbd_data->input, KEY_PHONE, 1);

	input_sync(neo1973kbd_data->input);

	return IRQ_HANDLED;
}

static irqreturn_t neo1973kbd_hold_irq(int irq, void *dev_id)
{
	struct neo1973kbd *neo1973kbd_data = dev_id;

	/* FIXME: use GPIO from platform_dev resources */
	if (s3c2410_gpio_getpin(GTA01_GPIO_HOLD_KEY))
		input_report_key(neo1973kbd_data->input, KEY_PAUSE, 1);
	else
		input_report_key(neo1973kbd_data->input, KEY_PAUSE, 0);

	input_sync(neo1973kbd_data->input);

	return IRQ_HANDLED;
}

static irqreturn_t neo1973kbd_headphone_irq(int irq, void *dev_id)
{
	struct neo1973kbd *neo1973kbd_data = dev_id;

	/* FIXME: use GPIO from platform_dev resources */
	if (s3c2410_gpio_getpin(GTA01_GPIO_JACK_INSERT))
		input_report_switch(neo1973kbd_data->input,
				    SW_HEADPHONE_INSERT, 1);
	else
		input_report_switch(neo1973kbd_data->input,
				    SW_HEADPHONE_INSERT, 0);

	input_sync(neo1973kbd_data->input);

	return IRQ_HANDLED;
}

#ifdef CONFIG_PM
static int neo1973kbd_suspend(struct platform_device *dev, pm_message_t state)
{
	struct neo1973kbd *neo1973kbd = platform_get_drvdata(dev);

	neo1973kbd->suspended = 1;

	return 0;
}

static int neo1973kbd_resume(struct platform_device *dev)
{
	struct neo1973kbd *neo1973kbd = platform_get_drvdata(dev);

	neo1973kbd->suspended = 0;

	return 0;
}
#else
#define neo1973kbd_suspend	NULL
#define neo1973kbd_resume	NULL
#endif

static int neo1973kbd_probe(struct platform_device *pdev)
{
	struct neo1973kbd *neo1973kbd;
	struct input_dev *input_dev;
	int rc, irq_aux, irq_hold, irq_jack;

	neo1973kbd = kzalloc(sizeof(struct neo1973kbd), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!neo1973kbd || !input_dev) {
		kfree(neo1973kbd);
		input_free_device(input_dev);
		return -ENOMEM;
	}

	if (pdev->resource[0].flags != 0)
		return -EINVAL;

	irq_aux = s3c2410_gpio_getirq(pdev->resource[0].start);
	if (irq_aux < 0)
		return -EINVAL;

	irq_hold = s3c2410_gpio_getirq(pdev->resource[1].start);
	if (irq_hold < 0)
		return -EINVAL;

	irq_jack = s3c2410_gpio_getirq(pdev->resource[2].start);
	if (irq_jack < 0)
		return -EINVAL;

	platform_set_drvdata(pdev, neo1973kbd);

	neo1973kbd->input = input_dev;

	input_dev->name = "Neo1973 Buttons";
	input_dev->phys = "neo1973kbd/input0";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->cdev.dev = &pdev->dev;
	input_dev->private = neo1973kbd;

	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_SW);
	set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);
	set_bit(KEY_PHONE, input_dev->keybit);
	set_bit(KEY_PAUSE, input_dev->keybit);

	rc = input_register_device(neo1973kbd->input);
	if (rc)
		goto out_register;

	if (request_irq(irq_aux, neo1973kbd_aux_irq, IRQF_DISABLED |
			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
			"Neo1973 AUX button", neo1973kbd)) {
		dev_err(&pdev->dev, "Can't get IRQ %u\n", irq_aux);
		goto out_aux;
	}

	/*
	 * GTA01 revisions before Bv4 can't be resumed by the PMU, so we use
	 * resume by AUX.
	 */
	if (machine_is_neo1973_gta01())
		enable_irq_wake(irq_aux);

	if (request_irq(irq_hold, neo1973kbd_hold_irq, IRQF_DISABLED |
			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
			"Neo1973 HOLD button", neo1973kbd)) {
		dev_err(&pdev->dev, "Can't get IRQ %u\n", irq_hold);
		goto out_hold;
	}

	if (request_irq(irq_jack, neo1973kbd_headphone_irq, IRQF_DISABLED |
			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
			"Neo1973 Headphone Jack", neo1973kbd)) {
		dev_err(&pdev->dev, "Can't get IRQ %u\n", irq_jack);
		goto out_jack;
	}
	enable_irq_wake(irq_jack);

	return 0;

out_jack:
	free_irq(irq_hold, neo1973kbd);
out_hold:
	free_irq(irq_aux, neo1973kbd);
out_aux:
	input_unregister_device(neo1973kbd->input);
out_register:
	input_free_device(neo1973kbd->input);
	platform_set_drvdata(pdev, NULL);
	kfree(neo1973kbd);

	return -ENODEV;
}

static int neo1973kbd_remove(struct platform_device *pdev)
{
	struct neo1973kbd *neo1973kbd = platform_get_drvdata(pdev);

	free_irq(s3c2410_gpio_getirq(pdev->resource[2].start), neo1973kbd);
	free_irq(s3c2410_gpio_getirq(pdev->resource[1].start), neo1973kbd);
	free_irq(s3c2410_gpio_getirq(pdev->resource[0].start), neo1973kbd);

	input_unregister_device(neo1973kbd->input);
	input_free_device(neo1973kbd->input);
	platform_set_drvdata(pdev, NULL);
	kfree(neo1973kbd);

	return 0;
}

static struct platform_driver neo1973kbd_driver = {
	.probe		= neo1973kbd_probe,
	.remove		= neo1973kbd_remove,
	.suspend	= neo1973kbd_suspend,
	.resume		= neo1973kbd_resume,
	.driver		= {
		.name	= "neo1973-button",
	},
};

static int __devinit neo1973kbd_init(void)
{
	return platform_driver_register(&neo1973kbd_driver);
}

static void __exit neo1973kbd_exit(void)
{
	platform_driver_unregister(&neo1973kbd_driver);
}

module_init(neo1973kbd_init);
module_exit(neo1973kbd_exit);

MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
MODULE_DESCRIPTION("FIC Neo1973 buttons input driver");
MODULE_LICENSE("GPL");