[mirror_ubuntu-zesty-kernel.git] / drivers / input / misc / ab8500-ponkey.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
 *
 * AB8500 Power-On Key handler
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/of.h>
#include <linux/slab.h>

/**
 * struct ab8500_ponkey - ab8500 ponkey information
 * @input_dev: pointer to input device
 * @ab8500: ab8500 parent
 * @irq_dbf: irq number for falling transition
 * @irq_dbr: irq number for rising transition
 */
struct ab8500_ponkey {
	struct input_dev	*idev;
	struct ab8500		*ab8500;
	int			irq_dbf;
	int			irq_dbr;
};

/* AB8500 gives us an interrupt when ONKEY is held */
static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
{
	struct ab8500_ponkey *ponkey = data;

	if (irq == ponkey->irq_dbf)
		input_report_key(ponkey->idev, KEY_POWER, true);
	else if (irq == ponkey->irq_dbr)
		input_report_key(ponkey->idev, KEY_POWER, false);

	input_sync(ponkey->idev);

	return IRQ_HANDLED;
}

static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
{
	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
	struct ab8500_ponkey *ponkey;
	struct input_dev *input;
	int irq_dbf, irq_dbr;
	int error;

	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
	if (irq_dbf < 0) {
		dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
		return irq_dbf;
	}

	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
	if (irq_dbr < 0) {
		dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
		return irq_dbr;
	}

	ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
	input = input_allocate_device();
	if (!ponkey || !input) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	ponkey->idev = input;
	ponkey->ab8500 = ab8500;
	ponkey->irq_dbf = ab8500_irq_get_virq(ab8500, irq_dbf);
	ponkey->irq_dbr = ab8500_irq_get_virq(ab8500, irq_dbr);

	input->name = "AB8500 POn(PowerOn) Key";
	input->dev.parent = &pdev->dev;

	input_set_capability(input, EV_KEY, KEY_POWER);

	error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
					0, "ab8500-ponkey-dbf", ponkey);
	if (error < 0) {
		dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
			ponkey->irq_dbf, error);
		goto err_free_mem;
	}

	error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
					0, "ab8500-ponkey-dbr", ponkey);
	if (error < 0) {
		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
			ponkey->irq_dbr, error);
		goto err_free_dbf_irq;
	}

	error = input_register_device(ponkey->idev);
	if (error) {
		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
		goto err_free_dbr_irq;
	}

	platform_set_drvdata(pdev, ponkey);
	return 0;

err_free_dbr_irq:
	free_irq(ponkey->irq_dbr, ponkey);
err_free_dbf_irq:
	free_irq(ponkey->irq_dbf, ponkey);
err_free_mem:
	input_free_device(input);
	kfree(ponkey);

	return error;
}

static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
{
	struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);

	free_irq(ponkey->irq_dbf, ponkey);
	free_irq(ponkey->irq_dbr, ponkey);
	input_unregister_device(ponkey->idev);
	kfree(ponkey);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id ab8500_ponkey_match[] = {
	{ .compatible = "stericsson,ab8500-ponkey", },
	{}
};
#endif

static struct platform_driver ab8500_ponkey_driver = {
	.driver		= {
		.name	= "ab8500-poweron-key",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(ab8500_ponkey_match),
	},
	.probe		= ab8500_ponkey_probe,
	.remove		= __devexit_p(ab8500_ponkey_remove),
};
module_platform_driver(ab8500_ponkey_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
Commit	Line	Data
77686517 SI	1	/*
	2	* Copyright (C) ST-Ericsson SA 2010
	3	*
	4	* License Terms: GNU General Public License v2
	5	* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
	6	*
	7	* AB8500 Power-On Key handler
	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/input.h>
	14	#include <linux/interrupt.h>
ee66e653	15	#include <linux/mfd/abx500/ab8500.h>
03ecd229	16	#include <linux/of.h>
77686517 SI	17	#include <linux/slab.h>
	18
	19	/**
	20	* struct ab8500_ponkey - ab8500 ponkey information
	21	* @input_dev: pointer to input device
	22	* @ab8500: ab8500 parent
	23	* @irq_dbf: irq number for falling transition
	24	* @irq_dbr: irq number for rising transition
	25	*/
	26	struct ab8500_ponkey {
	27	struct input_dev *idev;
	28	struct ab8500 *ab8500;
	29	int irq_dbf;
	30	int irq_dbr;
	31	};
	32
	33	/* AB8500 gives us an interrupt when ONKEY is held */
	34	static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
	35	{
	36	struct ab8500_ponkey *ponkey = data;
	37
	38	if (irq == ponkey->irq_dbf)
	39	input_report_key(ponkey->idev, KEY_POWER, true);
	40	else if (irq == ponkey->irq_dbr)
	41	input_report_key(ponkey->idev, KEY_POWER, false);
	42
	43	input_sync(ponkey->idev);
	44
	45	return IRQ_HANDLED;
	46	}
	47
	48	static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
	49	{
	50	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
	51	struct ab8500_ponkey *ponkey;
	52	struct input_dev *input;
	53	int irq_dbf, irq_dbr;
	54	int error;
	55
	56	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
	57	if (irq_dbf < 0) {
	58	dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
	59	return irq_dbf;
	60	}
	61
	62	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
	63	if (irq_dbr < 0) {
	64	dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
	65	return irq_dbr;
	66	}
	67
	68	ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
	69	input = input_allocate_device();
	70	if (!ponkey \|\| !input) {
	71	error = -ENOMEM;
	72	goto err_free_mem;
	73	}
	74
	75	ponkey->idev = input;
	76	ponkey->ab8500 = ab8500;
ca3b3faf LJ	77	ponkey->irq_dbf = ab8500_irq_get_virq(ab8500, irq_dbf);
ca3b3faf LJ	78	ponkey->irq_dbr = ab8500_irq_get_virq(ab8500, irq_dbr);
77686517 SI	79
	80	input->name = "AB8500 POn(PowerOn) Key";
	81	input->dev.parent = &pdev->dev;
	82
	83	input_set_capability(input, EV_KEY, KEY_POWER);
	84
	85	error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
	86	0, "ab8500-ponkey-dbf", ponkey);
	87	if (error < 0) {
	88	dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
	89	ponkey->irq_dbf, error);
	90	goto err_free_mem;
	91	}
	92
	93	error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
	94	0, "ab8500-ponkey-dbr", ponkey);
	95	if (error < 0) {
	96	dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
	97	ponkey->irq_dbr, error);
	98	goto err_free_dbf_irq;
	99	}
	100
	101	error = input_register_device(ponkey->idev);
	102	if (error) {
	103	dev_err(ab8500->dev, "Can't register input device: %d\n", error);
	104	goto err_free_dbr_irq;
	105	}
	106
	107	platform_set_drvdata(pdev, ponkey);
	108	return 0;
	109
	110	err_free_dbr_irq:
c5fb514d	111	free_irq(ponkey->irq_dbr, ponkey);
77686517 SI	112	err_free_dbf_irq:
	113	free_irq(ponkey->irq_dbf, ponkey);
	114	err_free_mem:
	115	input_free_device(input);
	116	kfree(ponkey);
	117
	118	return error;
	119	}
	120
	121	static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
	122	{
	123	struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);
	124
	125	free_irq(ponkey->irq_dbf, ponkey);
	126	free_irq(ponkey->irq_dbr, ponkey);
	127	input_unregister_device(ponkey->idev);
	128	kfree(ponkey);
	129
	130	platform_set_drvdata(pdev, NULL);
	131
	132	return 0;
	133	}
	134
03ecd229 LJ	135	#ifdef CONFIG_OF
	136	static const struct of_device_id ab8500_ponkey_match[] = {
	137	{ .compatible = "stericsson,ab8500-ponkey", },
	138	{}
	139	};
	140	#endif
	141
77686517 SI	142	static struct platform_driver ab8500_ponkey_driver = {
	143	.driver = {
	144	.name = "ab8500-poweron-key",
	145	.owner = THIS_MODULE,
03ecd229	146	.of_match_table = of_match_ptr(ab8500_ponkey_match),
77686517 SI	147	},
	148	.probe = ab8500_ponkey_probe,
	149	.remove = __devexit_p(ab8500_ponkey_remove),
	150	};
840a746b	151	module_platform_driver(ab8500_ponkey_driver);
77686517 SI	152
	153	MODULE_LICENSE("GPL v2");
	154	MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
	155	MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");