[linux-2.6-block.git] / drivers / input / misc / 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>
#include <linux/device.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;
	unsigned 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 state;

	state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);

	input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
	input_sync(info->idev);

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

	/* 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 max8925_onkey_probe(struct platform_device *pdev)
{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_onkey_info *info;
	struct input_dev *input;
	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 = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info),
			    GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	input = devm_input_allocate_device(&pdev->dev);
	if (!input)
		return -ENOMEM;

	info->idev = input;
	info->i2c = chip->i2c;
	info->dev = &pdev->dev;
	info->irq[0] = irq[0];
	info->irq[1] = irq[1];

	input->name = "max8925_on";
	input->phys = "max8925_on/input0";
	input->id.bustype = BUS_I2C;
	input->dev.parent = &pdev->dev;
	input_set_capability(input, EV_KEY, KEY_POWER);

	error = devm_request_threaded_irq(&pdev->dev, 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);
		return error;
	}

	error = devm_request_threaded_irq(&pdev->dev, 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);
		return error;
	}

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

	platform_set_drvdata(pdev, info);
	device_init_wakeup(&pdev->dev, 1);

	return 0;
}

static int __maybe_unused max8925_onkey_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct max8925_onkey_info *info = platform_get_drvdata(pdev);
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);

	if (device_may_wakeup(dev)) {
		chip->wakeup_flag |= 1 << info->irq[0];
		chip->wakeup_flag |= 1 << info->irq[1];
	}

	return 0;
}

static int __maybe_unused max8925_onkey_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct max8925_onkey_info *info = platform_get_drvdata(pdev);
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);

	if (device_may_wakeup(dev)) {
		chip->wakeup_flag &= ~(1 << info->irq[0]);
		chip->wakeup_flag &= ~(1 << info->irq[1]);
	}

	return 0;
}

static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);

static struct platform_driver max8925_onkey_driver = {
	.driver		= {
		.name	= "max8925-onkey",
		.pm	= &max8925_onkey_pm_ops,
	},
	.probe		= max8925_onkey_probe,
};
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	1	/**
104a5f3c	2	* MAX8925 ONKEY driver
3734574c HZ	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>
04115e41	29	#include <linux/device.h>
3734574c	30
2d95ae3b	31	#define SW_INPUT (1 << 7) /* 0/1 -- up/down */
3734574c HZ	32	#define HARDRESET_EN (1 << 7)
	33	#define PWREN_EN (1 << 7)
	34
	35	struct max8925_onkey_info {
	36	struct input_dev *idev;
	37	struct i2c_client *i2c;
2d95ae3b	38	struct device *dev;
104a5f3c	39	unsigned int irq[2];
3734574c HZ	40	};
	41
	42	/*
2d95ae3b	43	* MAX8925 gives us an interrupt when ONKEY is pressed or released.
3734574c HZ	44	* max8925_set_bits() operates I2C bus and may sleep. So implement
	45	* it in thread IRQ handler.
	46	*/
	47	static irqreturn_t max8925_onkey_handler(int irq, void *data)
	48	{
	49	struct max8925_onkey_info *info = data;
104a5f3c DT	50	int state;
	51
	52	state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
	53
	54	input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
3734574c HZ	55	input_sync(info->idev);
3734574c HZ	56
104a5f3c	57	dev_dbg(info->dev, "onkey state:%d\n", state);
2d95ae3b	58
3734574c HZ	59	/* Enable hardreset to halt if system isn't shutdown on time */
	60	max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
	61	HARDRESET_EN, HARDRESET_EN);
	62
	63	return IRQ_HANDLED;
	64	}
	65
5298cc4c	66	static int max8925_onkey_probe(struct platform_device *pdev)
3734574c HZ	67	{
	68	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	69	struct max8925_onkey_info *info;
104a5f3c	70	struct input_dev *input;
2d95ae3b HZ	71	int irq[2], error;
	72
	73	irq[0] = platform_get_irq(pdev, 0);
	74	if (irq[0] < 0) {
	75	dev_err(&pdev->dev, "No IRQ resource!\n");
	76	return -EINVAL;
	77	}
104a5f3c	78
2d95ae3b HZ	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	84
04115e41 HS	85	info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info),
	86	GFP_KERNEL);
	87	if (!info)
	88	return -ENOMEM;
	89
	90	input = devm_input_allocate_device(&pdev->dev);
	91	if (!input)
	92	return -ENOMEM;
3734574c	93
104a5f3c	94	info->idev = input;
3734574c	95	info->i2c = chip->i2c;
2d95ae3b	96	info->dev = &pdev->dev;
104a5f3c DT	97	info->irq[0] = irq[0];
	98	info->irq[1] = irq[1];
	99
	100	input->name = "max8925_on";
	101	input->phys = "max8925_on/input0";
	102	input->id.bustype = BUS_I2C;
	103	input->dev.parent = &pdev->dev;
	104	input_set_capability(input, EV_KEY, KEY_POWER);
	105
04115e41 HS	106	error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL,
	107	max8925_onkey_handler, IRQF_ONESHOT,
	108	"onkey-down", info);
2d95ae3b HZ	109	if (error < 0) {
	110	dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
	111	irq[0], error);
04115e41	112	return error;
2d95ae3b	113	}
104a5f3c	114
04115e41 HS	115	error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL,
	116	max8925_onkey_handler, IRQF_ONESHOT,
	117	"onkey-up", info);
2d95ae3b HZ	118	if (error < 0) {
	119	dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
	120	irq[1], error);
04115e41	121	return error;
2d95ae3b	122	}
3734574c	123
3734574c HZ	124	error = input_register_device(info->idev);
	125	if (error) {
	126	dev_err(chip->dev, "Can't register input device: %d\n", error);
04115e41	127	return error;
3734574c HZ	128	}
	129
	130	platform_set_drvdata(pdev, info);
104a5f3c	131	device_init_wakeup(&pdev->dev, 1);
3734574c	132
3734574c HZ	133	return 0;
	134	}
	135
97a652a8	136	static int __maybe_unused max8925_onkey_suspend(struct device *dev)
adab30d7 KL	137	{
	138	struct platform_device *pdev = to_platform_device(dev);
	139	struct max8925_onkey_info *info = platform_get_drvdata(pdev);
	140	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	141
	142	if (device_may_wakeup(dev)) {
104a5f3c DT	143	chip->wakeup_flag \|= 1 << info->irq[0];
104a5f3c DT	144	chip->wakeup_flag \|= 1 << info->irq[1];
adab30d7 KL	145	}
	146
	147	return 0;
	148	}
	149
97a652a8	150	static int __maybe_unused max8925_onkey_resume(struct device *dev)
adab30d7 KL	151	{
	152	struct platform_device *pdev = to_platform_device(dev);
	153	struct max8925_onkey_info *info = platform_get_drvdata(pdev);
	154	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	155
	156	if (device_may_wakeup(dev)) {
104a5f3c DT	157	chip->wakeup_flag &= ~(1 << info->irq[0]);
104a5f3c DT	158	chip->wakeup_flag &= ~(1 << info->irq[1]);
adab30d7 KL	159	}
	160
	161	return 0;
	162	}
adab30d7 KL	163
	164	static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);
	165
3734574c HZ	166	static struct platform_driver max8925_onkey_driver = {
	167	.driver = {
	168	.name = "max8925-onkey",
adab30d7	169	.pm = &max8925_onkey_pm_ops,
3734574c HZ	170	},
3734574c HZ	171	.probe = max8925_onkey_probe,
3734574c	172	};
840a746b	173	module_platform_driver(max8925_onkey_driver);
3734574c HZ	174
	175	MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
	176	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	177	MODULE_LICENSE("GPL");