[deliverable/linux.git] / drivers / input / misc / twl4030-pwrbutton.c

/**
 * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
 * Several fixes by Felipe Balbi <felipe.balbi@nokia.com>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/i2c/twl.h>

#define PWR_PWRON_IRQ (1 << 0)

#define STS_HW_CONDITIONS 0xf

static irqreturn_t powerbutton_irq(int irq, void *_pwr)
{
	struct input_dev *pwr = _pwr;
	int err;
	u8 value;

	err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
				STS_HW_CONDITIONS);
	if (!err)  {
		input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
		input_sync(pwr);
	} else {
		dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
			" TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
	}

	return IRQ_HANDLED;
}

static int __init twl4030_pwrbutton_probe(struct platform_device *pdev)
{
	struct input_dev *pwr;
	int irq = platform_get_irq(pdev, 0);
	int err;

	pwr = input_allocate_device();
	if (!pwr) {
		dev_dbg(&pdev->dev, "Can't allocate power button\n");
		return -ENOMEM;
	}

	pwr->evbit[0] = BIT_MASK(EV_KEY);
	pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
	pwr->name = "twl4030_pwrbutton";
	pwr->phys = "twl4030_pwrbutton/input0";
	pwr->dev.parent = &pdev->dev;

	err = request_threaded_irq(irq, NULL, powerbutton_irq,
			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
			"twl4030_pwrbutton", pwr);
	if (err < 0) {
		dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
		goto free_input_dev;
	}

	err = input_register_device(pwr);
	if (err) {
		dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
		goto free_irq;
	}

	platform_set_drvdata(pdev, pwr);

	return 0;

free_irq:
	free_irq(irq, NULL);
free_input_dev:
	input_free_device(pwr);
	return err;
}

static int __exit twl4030_pwrbutton_remove(struct platform_device *pdev)
{
	struct input_dev *pwr = platform_get_drvdata(pdev);
	int irq = platform_get_irq(pdev, 0);

	free_irq(irq, pwr);
	input_unregister_device(pwr);

	return 0;
}

static struct platform_driver twl4030_pwrbutton_driver = {
	.remove		= __exit_p(twl4030_pwrbutton_remove),
	.driver		= {
		.name	= "twl4030_pwrbutton",
		.owner	= THIS_MODULE,
	},
};

static int __init twl4030_pwrbutton_init(void)
{
	return platform_driver_probe(&twl4030_pwrbutton_driver,
			twl4030_pwrbutton_probe);
}
module_init(twl4030_pwrbutton_init);

static void __exit twl4030_pwrbutton_exit(void)
{
	platform_driver_unregister(&twl4030_pwrbutton_driver);
}
module_exit(twl4030_pwrbutton_exit);

MODULE_ALIAS("platform:twl4030_pwrbutton");
MODULE_DESCRIPTION("Triton2 Power Button");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
Commit	Line	Data
68d8bf04 FB	1	/**
	2	* twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
	3	*
	4	* Copyright (C) 2008-2009 Nokia Corporation
	5	*
	6	* Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
	7	* Several fixes by Felipe Balbi <felipe.balbi@nokia.com>
	8	*
	9	* This file is subject to the terms and conditions of the GNU General
	10	* Public License. See the file "COPYING" in the main directory of this
	11	* archive for more details.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/kernel.h>
	26	#include <linux/errno.h>
	27	#include <linux/input.h>
	28	#include <linux/interrupt.h>
	29	#include <linux/platform_device.h>
b07682b6	30	#include <linux/i2c/twl.h>
68d8bf04 FB	31
	32	#define PWR_PWRON_IRQ (1 << 0)
	33
	34	#define STS_HW_CONDITIONS 0xf
	35
	36	static irqreturn_t powerbutton_irq(int irq, void *_pwr)
	37	{
	38	struct input_dev *pwr = _pwr;
	39	int err;
	40	u8 value;
	41
fc7b92fc	42	err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
70f94413	43	STS_HW_CONDITIONS);
68d8bf04 FB	44	if (!err) {
	45	input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
	46	input_sync(pwr);
	47	} else {
	48	dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
	49	" TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
	50	}
	51
	52	return IRQ_HANDLED;
	53	}
	54
dda7b73c	55	static int __init twl4030_pwrbutton_probe(struct platform_device *pdev)
68d8bf04 FB	56	{
	57	struct input_dev *pwr;
	58	int irq = platform_get_irq(pdev, 0);
	59	int err;
	60
	61	pwr = input_allocate_device();
	62	if (!pwr) {
	63	dev_dbg(&pdev->dev, "Can't allocate power button\n");
	64	return -ENOMEM;
	65	}
	66
	67	pwr->evbit[0] = BIT_MASK(EV_KEY);
	68	pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
	69	pwr->name = "twl4030_pwrbutton";
	70	pwr->phys = "twl4030_pwrbutton/input0";
	71	pwr->dev.parent = &pdev->dev;
	72
70f94413	73	err = request_threaded_irq(irq, NULL, powerbutton_irq,
68d8bf04 FB	74	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING,
	75	"twl4030_pwrbutton", pwr);
	76	if (err < 0) {
	77	dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
	78	goto free_input_dev;
	79	}
	80
	81	err = input_register_device(pwr);
	82	if (err) {
	83	dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
	84	goto free_irq;
	85	}
	86
	87	platform_set_drvdata(pdev, pwr);
	88
	89	return 0;
	90
	91	free_irq:
	92	free_irq(irq, NULL);
	93	free_input_dev:
	94	input_free_device(pwr);
	95	return err;
	96	}
	97
dda7b73c	98	static int __exit twl4030_pwrbutton_remove(struct platform_device *pdev)
68d8bf04 FB	99	{
	100	struct input_dev *pwr = platform_get_drvdata(pdev);
	101	int irq = platform_get_irq(pdev, 0);
	102
	103	free_irq(irq, pwr);
	104	input_unregister_device(pwr);
	105
	106	return 0;
	107	}
	108
dda7b73c ML	109	static struct platform_driver twl4030_pwrbutton_driver = {
dda7b73c ML	110	.remove = __exit_p(twl4030_pwrbutton_remove),
68d8bf04 FB	111	.driver = {
	112	.name = "twl4030_pwrbutton",
	113	.owner = THIS_MODULE,
	114	},
	115	};
	116
	117	static int __init twl4030_pwrbutton_init(void)
	118	{
dda7b73c ML	119	return platform_driver_probe(&twl4030_pwrbutton_driver,
dda7b73c ML	120	twl4030_pwrbutton_probe);
68d8bf04 FB	121	}
	122	module_init(twl4030_pwrbutton_init);
	123
	124	static void __exit twl4030_pwrbutton_exit(void)
	125	{
	126	platform_driver_unregister(&twl4030_pwrbutton_driver);
	127	}
	128	module_exit(twl4030_pwrbutton_exit);
	129
	130	MODULE_ALIAS("platform:twl4030_pwrbutton");
	131	MODULE_DESCRIPTION("Triton2 Power Button");
	132	MODULE_LICENSE("GPL");
	133	MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
	134	MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
	135