[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / input / misc / wm831x-on.c

/**
 * wm831x-on.c - WM831X ON pin driver
 *
 * Copyright (C) 2009 Wolfson Microelectronics plc
 *
 * 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/slab.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/mfd/wm831x/core.h>

struct wm831x_on {
	struct input_dev *dev;
	struct delayed_work work;
	struct wm831x *wm831x;
};

/*
 * The chip gives us an interrupt when the ON pin is asserted but we
 * then need to poll to see when the pin is deasserted.
 */
static void wm831x_poll_on(struct work_struct *work)
{
	struct wm831x_on *wm831x_on = container_of(work, struct wm831x_on,
						   work.work);
	struct wm831x *wm831x = wm831x_on->wm831x;
	int poll, ret;

	ret = wm831x_reg_read(wm831x, WM831X_ON_PIN_CONTROL);
	if (ret >= 0) {
		poll = !(ret & WM831X_ON_PIN_STS);

		input_report_key(wm831x_on->dev, KEY_POWER, poll);
		input_sync(wm831x_on->dev);
	} else {
		dev_err(wm831x->dev, "Failed to read ON status: %d\n", ret);
		poll = 1;
	}

	if (poll)
		schedule_delayed_work(&wm831x_on->work, 100);
}

static irqreturn_t wm831x_on_irq(int irq, void *data)
{
	struct wm831x_on *wm831x_on = data;

	schedule_delayed_work(&wm831x_on->work, 0);

	return IRQ_HANDLED;
}

static int __devinit wm831x_on_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_on *wm831x_on;
	int irq = platform_get_irq(pdev, 0);
	int ret;

	wm831x_on = kzalloc(sizeof(struct wm831x_on), GFP_KERNEL);
	if (!wm831x_on) {
		dev_err(&pdev->dev, "Can't allocate data\n");
		return -ENOMEM;
	}

	wm831x_on->wm831x = wm831x;
	INIT_DELAYED_WORK(&wm831x_on->work, wm831x_poll_on);

	wm831x_on->dev = input_allocate_device();
	if (!wm831x_on->dev) {
		dev_err(&pdev->dev, "Can't allocate input dev\n");
		ret = -ENOMEM;
		goto err;
	}

	wm831x_on->dev->evbit[0] = BIT_MASK(EV_KEY);
	wm831x_on->dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
	wm831x_on->dev->name = "wm831x_on";
	wm831x_on->dev->phys = "wm831x_on/input0";
	wm831x_on->dev->dev.parent = &pdev->dev;

	ret = request_threaded_irq(irq, NULL, wm831x_on_irq,
				   IRQF_TRIGGER_RISING, "wm831x_on",
				   wm831x_on);
	if (ret < 0) {
		dev_err(&pdev->dev, "Unable to request IRQ: %d\n", ret);
		goto err_input_dev;
	}
	ret = input_register_device(wm831x_on->dev);
	if (ret) {
		dev_dbg(&pdev->dev, "Can't register input device: %d\n", ret);
		goto err_irq;
	}

	platform_set_drvdata(pdev, wm831x_on);

	return 0;

err_irq:
	free_irq(irq, wm831x_on);
err_input_dev:
	input_free_device(wm831x_on->dev);
err:
	kfree(wm831x_on);
	return ret;
}

static int __devexit wm831x_on_remove(struct platform_device *pdev)
{
	struct wm831x_on *wm831x_on = platform_get_drvdata(pdev);
	int irq = platform_get_irq(pdev, 0);

	free_irq(irq, wm831x_on);
	cancel_delayed_work_sync(&wm831x_on->work);
	input_unregister_device(wm831x_on->dev);
	kfree(wm831x_on);

	return 0;
}

static struct platform_driver wm831x_on_driver = {
	.probe		= wm831x_on_probe,
	.remove		= __devexit_p(wm831x_on_remove),
	.driver		= {
		.name	= "wm831x-on",
		.owner	= THIS_MODULE,
	},
};

static int __init wm831x_on_init(void)
{
	return platform_driver_register(&wm831x_on_driver);
}
module_init(wm831x_on_init);

static void __exit wm831x_on_exit(void)
{
	platform_driver_unregister(&wm831x_on_driver);
}
module_exit(wm831x_on_exit);

MODULE_ALIAS("platform:wm831x-on");
MODULE_DESCRIPTION("WM831x ON pin");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
Commit	Line	Data
0c73b992 MB	1	/**
	2	* wm831x-on.c - WM831X ON pin driver
	3	*
	4	* Copyright (C) 2009 Wolfson Microelectronics plc
	5	*
	6	* This file is subject to the terms and conditions of the GNU General
	7	* Public License. See the file "COPYING" in the main directory of this
	8	* archive for more details.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include <linux/module.h>
	21	#include <linux/init.h>
5a0e3ad6	22	#include <linux/slab.h>
0c73b992 MB	23	#include <linux/kernel.h>
	24	#include <linux/errno.h>
	25	#include <linux/input.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/platform_device.h>
	28	#include <linux/workqueue.h>
	29	#include <linux/mfd/wm831x/core.h>
	30
	31	struct wm831x_on {
	32	struct input_dev *dev;
	33	struct delayed_work work;
	34	struct wm831x *wm831x;
	35	};
	36
	37	/*
	38	* The chip gives us an interrupt when the ON pin is asserted but we
	39	* then need to poll to see when the pin is deasserted.
	40	*/
	41	static void wm831x_poll_on(struct work_struct *work)
	42	{
	43	struct wm831x_on *wm831x_on = container_of(work, struct wm831x_on,
	44	work.work);
	45	struct wm831x *wm831x = wm831x_on->wm831x;
	46	int poll, ret;
	47
	48	ret = wm831x_reg_read(wm831x, WM831X_ON_PIN_CONTROL);
	49	if (ret >= 0) {
	50	poll = !(ret & WM831X_ON_PIN_STS);
	51
	52	input_report_key(wm831x_on->dev, KEY_POWER, poll);
	53	input_sync(wm831x_on->dev);
	54	} else {
	55	dev_err(wm831x->dev, "Failed to read ON status: %d\n", ret);
	56	poll = 1;
	57	}
	58
	59	if (poll)
	60	schedule_delayed_work(&wm831x_on->work, 100);
	61	}
	62
	63	static irqreturn_t wm831x_on_irq(int irq, void *data)
	64	{
	65	struct wm831x_on *wm831x_on = data;
	66
	67	schedule_delayed_work(&wm831x_on->work, 0);
	68
	69	return IRQ_HANDLED;
	70	}
	71
	72	static int __devinit wm831x_on_probe(struct platform_device *pdev)
	73	{
	74	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	75	struct wm831x_on *wm831x_on;
	76	int irq = platform_get_irq(pdev, 0);
	77	int ret;
	78
	79	wm831x_on = kzalloc(sizeof(struct wm831x_on), GFP_KERNEL);
	80	if (!wm831x_on) {
	81	dev_err(&pdev->dev, "Can't allocate data\n");
	82	return -ENOMEM;
	83	}
	84
	85	wm831x_on->wm831x = wm831x;
	86	INIT_DELAYED_WORK(&wm831x_on->work, wm831x_poll_on);
87
88	wm831x_on->dev = input_allocate_device();
89	if (!wm831x_on->dev) {
90	dev_err(&pdev->dev, "Can't allocate input dev\n");
91	ret = -ENOMEM;
92	goto err;
93	}
94
95	wm831x_on->dev->evbit[0] = BIT_MASK(EV_KEY);
96	wm831x_on->dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
97	wm831x_on->dev->name = "wm831x_on";
98	wm831x_on->dev->phys = "wm831x_on/input0";
99	wm831x_on->dev->dev.parent = &pdev->dev;
100
afadb8e0 MB	101	ret = request_threaded_irq(irq, NULL, wm831x_on_irq,
	102	IRQF_TRIGGER_RISING, "wm831x_on",
	103	wm831x_on);
0c73b992 MB	104	if (ret < 0) {
	105	dev_err(&pdev->dev, "Unable to request IRQ: %d\n", ret);
	106	goto err_input_dev;
	107	}
	108	ret = input_register_device(wm831x_on->dev);
	109	if (ret) {
	110	dev_dbg(&pdev->dev, "Can't register input device: %d\n", ret);
	111	goto err_irq;
	112	}
	113
	114	platform_set_drvdata(pdev, wm831x_on);
	115
	116	return 0;
	117
	118	err_irq:
afadb8e0	119	free_irq(irq, wm831x_on);
0c73b992 MB	120	err_input_dev:
	121	input_free_device(wm831x_on->dev);
	122	err:
	123	kfree(wm831x_on);
	124	return ret;
	125	}
	126
	127	static int __devexit wm831x_on_remove(struct platform_device *pdev)
	128	{
	129	struct wm831x_on *wm831x_on = platform_get_drvdata(pdev);
	130	int irq = platform_get_irq(pdev, 0);
	131
afadb8e0	132	free_irq(irq, wm831x_on);
0c73b992 MB	133	cancel_delayed_work_sync(&wm831x_on->work);
	134	input_unregister_device(wm831x_on->dev);
	135	kfree(wm831x_on);
	136
	137	return 0;
	138	}
	139
	140	static struct platform_driver wm831x_on_driver = {
	141	.probe = wm831x_on_probe,
	142	.remove = __devexit_p(wm831x_on_remove),
	143	.driver = {
	144	.name = "wm831x-on",
	145	.owner = THIS_MODULE,
	146	},
	147	};
	148
	149	static int __init wm831x_on_init(void)
	150	{
	151	return platform_driver_register(&wm831x_on_driver);
	152	}
	153	module_init(wm831x_on_init);
	154
	155	static void __exit wm831x_on_exit(void)
	156	{
	157	platform_driver_unregister(&wm831x_on_driver);
	158	}
	159	module_exit(wm831x_on_exit);
	160
	161	MODULE_ALIAS("platform:wm831x-on");
	162	MODULE_DESCRIPTION("WM831x ON pin");
	163	MODULE_LICENSE("GPL");
	164	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	165