[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 HARDRESET_EN		(1 << 7)
#define PWREN_EN		(1 << 7)

struct max8925_onkey_info {
	struct input_dev	*idev;
	struct i2c_client	*i2c;
	int			irq;
};

/*
 * MAX8925 gives us an interrupt when ONKEY is held for 3 seconds.
 * 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;

	input_report_key(info->idev, KEY_POWER, 1);
	input_sync(info->idev);

	/* 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 error;

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

	info->i2c = chip->i2c;
	info->irq = chip->irq_base + MAX8925_IRQ_GPM_SW_3SEC;

	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->idev->evbit[0] = BIT_MASK(EV_KEY);
	info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);

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

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

	platform_set_drvdata(pdev, info);

	return 0;

out:
	free_irq(info->irq, info);
out_irq:
	input_free_device(info->idev);
out_input:
	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, 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),
};

static int __init max8925_onkey_init(void)
{
	return platform_driver_register(&max8925_onkey_driver);
}
module_init(max8925_onkey_init);

static void __exit max8925_onkey_exit(void)
{
	platform_driver_unregister(&max8925_onkey_driver);
}
module_exit(max8925_onkey_exit);

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
	30	#define HARDRESET_EN (1 << 7)
	31	#define PWREN_EN (1 << 7)
	32
	33	struct max8925_onkey_info {
	34	struct input_dev *idev;
	35	struct i2c_client *i2c;
	36	int irq;
	37	};
	38
	39	/*
	40	* MAX8925 gives us an interrupt when ONKEY is held for 3 seconds.
	41	* max8925_set_bits() operates I2C bus and may sleep. So implement
	42	* it in thread IRQ handler.
	43	*/
	44	static irqreturn_t max8925_onkey_handler(int irq, void *data)
	45	{
	46	struct max8925_onkey_info *info = data;
	47
	48	input_report_key(info->idev, KEY_POWER, 1);
	49	input_sync(info->idev);
	50
	51	/* Enable hardreset to halt if system isn't shutdown on time */
	52	max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
	53	HARDRESET_EN, HARDRESET_EN);
	54
	55	return IRQ_HANDLED;
	56	}
	57
	58	static int __devinit max8925_onkey_probe(struct platform_device *pdev)
	59	{
	60	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	61	struct max8925_onkey_info *info;
	62	int error;
	63
	64	info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
65	if (!info)
66	return -ENOMEM;
67
68	info->i2c = chip->i2c;
69	info->irq = chip->irq_base + MAX8925_IRQ_GPM_SW_3SEC;
70
71	info->idev = input_allocate_device();
72	if (!info->idev) {
73	dev_err(chip->dev, "Failed to allocate input dev\n");
74	error = -ENOMEM;
75	goto out_input;
76	}
77
78	info->idev->name = "max8925_on";
79	info->idev->phys = "max8925_on/input0";
80	info->idev->id.bustype = BUS_I2C;
81	info->idev->dev.parent = &pdev->dev;
82	info->idev->evbit[0] = BIT_MASK(EV_KEY);
83	info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
84
85	error = request_threaded_irq(info->irq, NULL, max8925_onkey_handler,
86	IRQF_ONESHOT, "onkey", info);
87	if (error < 0) {
88	dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
89	info->irq, error);
90	goto out_irq;
91	}
92
93	error = input_register_device(info->idev);
94	if (error) {
95	dev_err(chip->dev, "Can't register input device: %d\n", error);
96	goto out;
97	}
98
99	platform_set_drvdata(pdev, info);
100
101	return 0;
102
103	out:
104	free_irq(info->irq, info);
105	out_irq:
106	input_free_device(info->idev);
107	out_input:
108	kfree(info);
109	return error;
110	}
111
112	static int __devexit max8925_onkey_remove(struct platform_device *pdev)
113	{
114	struct max8925_onkey_info *info = platform_get_drvdata(pdev);
115
116	free_irq(info->irq, info);
117	input_unregister_device(info->idev);
118	kfree(info);
119
120	platform_set_drvdata(pdev, NULL);
121
122	return 0;
123	}
124
125	static struct platform_driver max8925_onkey_driver = {
126	.driver = {
127	.name = "max8925-onkey",
128	.owner = THIS_MODULE,
129	},
130	.probe = max8925_onkey_probe,
131	.remove = __devexit_p(max8925_onkey_remove),
132	};
133
134	static int __init max8925_onkey_init(void)
135	{
136	return platform_driver_register(&max8925_onkey_driver);
137	}
138	module_init(max8925_onkey_init);
139
140	static void __exit max8925_onkey_exit(void)
141	{
142	platform_driver_unregister(&max8925_onkey_driver);
143	}
144	module_exit(max8925_onkey_exit);
145
146	MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
147	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
148	MODULE_LICENSE("GPL");