[linux-2.6-block.git] / drivers / input / misc / max8925_onkey.c

/**
 * max8925_onkey.c - MAX8925 ONKEY driver
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *      Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/max8925.h>
#include <linux/slab.h>

#define SW_INPUT		(1 << 7)	/* 0/1 -- up/down */
#define HARDRESET_EN		(1 << 7)
#define PWREN_EN		(1 << 7)

struct max8925_onkey_info {
	struct input_dev	*idev;
	struct i2c_client	*i2c;
	struct device		*dev;
	int			irq[2];
};

/*
 * MAX8925 gives us an interrupt when ONKEY is pressed or released.
 * max8925_set_bits() operates I2C bus and may sleep. So implement
 * it in thread IRQ handler.
 */
static irqreturn_t max8925_onkey_handler(int irq, void *data)
{
	struct max8925_onkey_info *info = data;
	int ret, event;

	ret = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
	if (ret & SW_INPUT)
		event = 1;
	else
		event = 0;
	input_report_key(info->idev, KEY_POWER, event);
	input_sync(info->idev);

	dev_dbg(info->dev, "onkey event:%d\n", event);

	/* Enable hardreset to halt if system isn't shutdown on time */
	max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
			 HARDRESET_EN, HARDRESET_EN);

	return IRQ_HANDLED;
}

static int __devinit max8925_onkey_probe(struct platform_device *pdev)
{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_onkey_info *info;
	int irq[2], error;

	irq[0] = platform_get_irq(pdev, 0);
	if (irq[0] < 0) {
		dev_err(&pdev->dev, "No IRQ resource!\n");
		return -EINVAL;
	}
	irq[1] = platform_get_irq(pdev, 1);
	if (irq[1] < 0) {
		dev_err(&pdev->dev, "No IRQ resource!\n");
		return -EINVAL;
	}

	info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->i2c = chip->i2c;
	info->dev = &pdev->dev;
	irq[0] += chip->irq_base;
	irq[1] += chip->irq_base;

	error = request_threaded_irq(irq[0], NULL, max8925_onkey_handler,
				     IRQF_ONESHOT, "onkey-down", info);
	if (error < 0) {
		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
			irq[0], error);
		goto out;
	}
	error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler,
				     IRQF_ONESHOT, "onkey-up", info);
	if (error < 0) {
		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
			irq[1], error);
		goto out_irq;
	}

	info->idev = input_allocate_device();
	if (!info->idev) {
		dev_err(chip->dev, "Failed to allocate input dev\n");
		error = -ENOMEM;
		goto out_input;
	}

	info->idev->name = "max8925_on";
	info->idev->phys = "max8925_on/input0";
	info->idev->id.bustype = BUS_I2C;
	info->idev->dev.parent = &pdev->dev;
	info->irq[0] = irq[0];
	info->irq[1] = irq[1];
	info->idev->evbit[0] = BIT_MASK(EV_KEY);
	info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);


	error = input_register_device(info->idev);
	if (error) {
		dev_err(chip->dev, "Can't register input device: %d\n", error);
		goto out_reg;
	}

	platform_set_drvdata(pdev, info);

	return 0;

out_reg:
	input_free_device(info->idev);
out_input:
	free_irq(info->irq[1], info);
out_irq:
	free_irq(info->irq[0], info);
out:
	kfree(info);
	return error;
}

static int __devexit max8925_onkey_remove(struct platform_device *pdev)
{
	struct max8925_onkey_info *info = platform_get_drvdata(pdev);

	free_irq(info->irq[0], info);
	free_irq(info->irq[1], info);
	input_unregister_device(info->idev);
	kfree(info);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver max8925_onkey_driver = {
	.driver		= {
		.name	= "max8925-onkey",
		.owner	= THIS_MODULE,
	},
	.probe		= max8925_onkey_probe,
	.remove		= __devexit_p(max8925_onkey_remove),
};
module_platform_driver(max8925_onkey_driver);

MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
3734574c HZ	1	/**
	2	* max8925_onkey.c - MAX8925 ONKEY driver
	3	*
	4	* Copyright (C) 2009 Marvell International Ltd.
	5	* Haojian Zhuang <haojian.zhuang@marvell.com>
	6	*
	7	* This file is subject to the terms and conditions of the GNU General
	8	* Public License. See the file "COPYING" in the main directory of this
	9	* archive for more details.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/i2c.h>
	25	#include <linux/input.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/mfd/max8925.h>
	28	#include <linux/slab.h>
	29
2d95ae3b	30	#define SW_INPUT (1 << 7) /* 0/1 -- up/down */
3734574c HZ	31	#define HARDRESET_EN (1 << 7)
	32	#define PWREN_EN (1 << 7)
	33
	34	struct max8925_onkey_info {
	35	struct input_dev *idev;
	36	struct i2c_client *i2c;
2d95ae3b HZ	37	struct device *dev;
2d95ae3b HZ	38	int irq[2];
3734574c HZ	39	};
	40
	41	/*
2d95ae3b	42	* MAX8925 gives us an interrupt when ONKEY is pressed or released.
3734574c HZ	43	* max8925_set_bits() operates I2C bus and may sleep. So implement
	44	* it in thread IRQ handler.
	45	*/
	46	static irqreturn_t max8925_onkey_handler(int irq, void *data)
	47	{
	48	struct max8925_onkey_info *info = data;
2d95ae3b HZ	49	int ret, event;
	50
	51	ret = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
	52	if (ret & SW_INPUT)
	53	event = 1;
	54	else
	55	event = 0;
	56	input_report_key(info->idev, KEY_POWER, event);
3734574c HZ	57	input_sync(info->idev);
3734574c HZ	58
2d95ae3b HZ	59	dev_dbg(info->dev, "onkey event:%d\n", event);
2d95ae3b HZ	60
3734574c HZ	61	/* Enable hardreset to halt if system isn't shutdown on time */
	62	max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
	63	HARDRESET_EN, HARDRESET_EN);
	64
	65	return IRQ_HANDLED;
	66	}
	67
	68	static int __devinit max8925_onkey_probe(struct platform_device *pdev)
	69	{
	70	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	71	struct max8925_onkey_info *info;
2d95ae3b HZ	72	int irq[2], error;
	73
	74	irq[0] = platform_get_irq(pdev, 0);
	75	if (irq[0] < 0) {
	76	dev_err(&pdev->dev, "No IRQ resource!\n");
	77	return -EINVAL;
	78	}
	79	irq[1] = platform_get_irq(pdev, 1);
	80	if (irq[1] < 0) {
	81	dev_err(&pdev->dev, "No IRQ resource!\n");
	82	return -EINVAL;
	83	}
3734574c HZ	84
	85	info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
	86	if (!info)
	87	return -ENOMEM;
	88
	89	info->i2c = chip->i2c;
2d95ae3b HZ	90	info->dev = &pdev->dev;
	91	irq[0] += chip->irq_base;
	92	irq[1] += chip->irq_base;
	93
	94	error = request_threaded_irq(irq[0], NULL, max8925_onkey_handler,
	95	IRQF_ONESHOT, "onkey-down", info);
	96	if (error < 0) {
	97	dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
	98	irq[0], error);
	99	goto out;
	100	}
	101	error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler,
	102	IRQF_ONESHOT, "onkey-up", info);
	103	if (error < 0) {
	104	dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
	105	irq[1], error);
	106	goto out_irq;
	107	}
3734574c HZ	108
	109	info->idev = input_allocate_device();
	110	if (!info->idev) {
	111	dev_err(chip->dev, "Failed to allocate input dev\n");
	112	error = -ENOMEM;
	113	goto out_input;
	114	}
	115
	116	info->idev->name = "max8925_on";
	117	info->idev->phys = "max8925_on/input0";
	118	info->idev->id.bustype = BUS_I2C;
	119	info->idev->dev.parent = &pdev->dev;
2d95ae3b HZ	120	info->irq[0] = irq[0];
2d95ae3b HZ	121	info->irq[1] = irq[1];
3734574c HZ	122	info->idev->evbit[0] = BIT_MASK(EV_KEY);
	123	info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
	124
3734574c HZ	125
	126	error = input_register_device(info->idev);
	127	if (error) {
	128	dev_err(chip->dev, "Can't register input device: %d\n", error);
2d95ae3b	129	goto out_reg;
3734574c HZ	130	}
	131
	132	platform_set_drvdata(pdev, info);
	133
	134	return 0;
	135
2d95ae3b	136	out_reg:
3734574c HZ	137	input_free_device(info->idev);
3734574c HZ	138	out_input:
2d95ae3b HZ	139	free_irq(info->irq[1], info);
	140	out_irq:
	141	free_irq(info->irq[0], info);
	142	out:
3734574c HZ	143	kfree(info);
	144	return error;
	145	}
	146
	147	static int __devexit max8925_onkey_remove(struct platform_device *pdev)
	148	{
	149	struct max8925_onkey_info *info = platform_get_drvdata(pdev);
	150
2d95ae3b HZ	151	free_irq(info->irq[0], info);
2d95ae3b HZ	152	free_irq(info->irq[1], info);
3734574c HZ	153	input_unregister_device(info->idev);
	154	kfree(info);
	155
	156	platform_set_drvdata(pdev, NULL);
	157
	158	return 0;
	159	}
	160
	161	static struct platform_driver max8925_onkey_driver = {
	162	.driver = {
	163	.name = "max8925-onkey",
	164	.owner = THIS_MODULE,
	165	},
	166	.probe = max8925_onkey_probe,
	167	.remove = __devexit_p(max8925_onkey_remove),
	168	};
840a746b	169	module_platform_driver(max8925_onkey_driver);
3734574c HZ	170
	171	MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
	172	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	173	MODULE_LICENSE("GPL");