[deliverable/linux.git] / drivers / input / misc / pmic8xxx-pwrkey.c

/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/log2.h>

#include <linux/input/pmic8xxx-pwrkey.h>

#define PON_CNTL_1 0x1C
#define PON_CNTL_PULL_UP BIT(7)
#define PON_CNTL_TRIG_DELAY_MASK (0x7)

/**
 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
 * @key_press_irq: key press irq number
 */
struct pmic8xxx_pwrkey {
	struct input_dev *pwr;
	int key_press_irq;
};

static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
{
	struct input_dev *pwr = _pwr;

	input_report_key(pwr, KEY_POWER, 1);
	input_sync(pwr);

	return IRQ_HANDLED;
}

static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
{
	struct input_dev *pwr = _pwr;

	input_report_key(pwr, KEY_POWER, 0);
	input_sync(pwr);

	return IRQ_HANDLED;
}

#ifdef CONFIG_PM_SLEEP
static int pmic8xxx_pwrkey_suspend(struct device *dev)
{
	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(pwrkey->key_press_irq);

	return 0;
}

static int pmic8xxx_pwrkey_resume(struct device *dev)
{
	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(pwrkey->key_press_irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
		pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);

static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
{
	struct input_dev *pwr;
	int key_release_irq = platform_get_irq(pdev, 0);
	int key_press_irq = platform_get_irq(pdev, 1);
	int err;
	unsigned int delay;
	unsigned int pon_cntl;
	struct regmap *regmap;
	struct pmic8xxx_pwrkey *pwrkey;
	const struct pm8xxx_pwrkey_platform_data *pdata =
					dev_get_platdata(&pdev->dev);

	if (!pdata) {
		dev_err(&pdev->dev, "power key platform data not supplied\n");
		return -EINVAL;
	}

	if (pdata->kpd_trigger_delay_us > 62500) {
		dev_err(&pdev->dev, "invalid power key trigger delay\n");
		return -EINVAL;
	}

	regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!regmap) {
		dev_err(&pdev->dev, "failed to locate regmap for the device\n");
		return -ENODEV;
	}

	pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
	if (!pwrkey)
		return -ENOMEM;

	pwr = input_allocate_device();
	if (!pwr) {
		dev_dbg(&pdev->dev, "Can't allocate power button\n");
		err = -ENOMEM;
		goto free_pwrkey;
	}

	input_set_capability(pwr, EV_KEY, KEY_POWER);

	pwr->name = "pmic8xxx_pwrkey";
	pwr->phys = "pmic8xxx_pwrkey/input0";
	pwr->dev.parent = &pdev->dev;

	delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
	delay = 1 + ilog2(delay);

	err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
	if (err < 0) {
		dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
		goto free_input_dev;
	}

	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
	pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
	if (pdata->pull_up)
		pon_cntl |= PON_CNTL_PULL_UP;
	else
		pon_cntl &= ~PON_CNTL_PULL_UP;

	err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
	if (err < 0) {
		dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
		goto free_input_dev;
	}

	err = input_register_device(pwr);
	if (err) {
		dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
		goto free_input_dev;
	}

	pwrkey->key_press_irq = key_press_irq;
	pwrkey->pwr = pwr;

	platform_set_drvdata(pdev, pwrkey);

	err = request_irq(key_press_irq, pwrkey_press_irq,
		IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwr);
	if (err < 0) {
		dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
				 key_press_irq, err);
		goto unreg_input_dev;
	}

	err = request_irq(key_release_irq, pwrkey_release_irq,
		 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwr);
	if (err < 0) {
		dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
				 key_release_irq, err);

		goto free_press_irq;
	}

	device_init_wakeup(&pdev->dev, pdata->wakeup);

	return 0;

free_press_irq:
	free_irq(key_press_irq, pwr);
unreg_input_dev:
	input_unregister_device(pwr);
	pwr = NULL;
free_input_dev:
	input_free_device(pwr);
free_pwrkey:
	kfree(pwrkey);
	return err;
}

static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
{
	struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
	int key_release_irq = platform_get_irq(pdev, 0);
	int key_press_irq = platform_get_irq(pdev, 1);

	device_init_wakeup(&pdev->dev, 0);

	free_irq(key_press_irq, pwrkey->pwr);
	free_irq(key_release_irq, pwrkey->pwr);
	input_unregister_device(pwrkey->pwr);
	kfree(pwrkey);

	return 0;
}

static struct platform_driver pmic8xxx_pwrkey_driver = {
	.probe		= pmic8xxx_pwrkey_probe,
	.remove		= pmic8xxx_pwrkey_remove,
	.driver		= {
		.name	= PM8XXX_PWRKEY_DEV_NAME,
		.owner	= THIS_MODULE,
		.pm	= &pm8xxx_pwr_key_pm_ops,
	},
};
module_platform_driver(pmic8xxx_pwrkey_driver);

MODULE_ALIAS("platform:pmic8xxx_pwrkey");
MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
Commit	Line	Data
92d57a73 TS	1	/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License version 2 and
	5	* only version 2 as published by the Free Software Foundation.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
	17	#include <linux/slab.h>
	18	#include <linux/input.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/platform_device.h>
1e63bd9c	21	#include <linux/regmap.h>
92d57a73 TS	22	#include <linux/log2.h>
92d57a73 TS	23
92d57a73 TS	24	#include <linux/input/pmic8xxx-pwrkey.h>
	25
	26	#define PON_CNTL_1 0x1C
	27	#define PON_CNTL_PULL_UP BIT(7)
	28	#define PON_CNTL_TRIG_DELAY_MASK (0x7)
	29
	30	/**
	31	* struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
	32	* @key_press_irq: key press irq number
	33	*/
	34	struct pmic8xxx_pwrkey {
	35	struct input_dev *pwr;
	36	int key_press_irq;
	37	};
	38
b27f8fee	39	static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
92d57a73	40	{
b27f8fee	41	struct input_dev *pwr = _pwr;
92d57a73	42
b27f8fee SB	43	input_report_key(pwr, KEY_POWER, 1);
b27f8fee SB	44	input_sync(pwr);
92d57a73 TS	45
	46	return IRQ_HANDLED;
	47	}
	48
b27f8fee	49	static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
92d57a73	50	{
b27f8fee	51	struct input_dev *pwr = _pwr;
92d57a73	52
b27f8fee SB	53	input_report_key(pwr, KEY_POWER, 0);
b27f8fee SB	54	input_sync(pwr);
92d57a73 TS	55
	56	return IRQ_HANDLED;
	57	}
	58
	59	#ifdef CONFIG_PM_SLEEP
	60	static int pmic8xxx_pwrkey_suspend(struct device *dev)
	61	{
	62	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
	63
	64	if (device_may_wakeup(dev))
	65	enable_irq_wake(pwrkey->key_press_irq);
	66
	67	return 0;
	68	}
	69
	70	static int pmic8xxx_pwrkey_resume(struct device *dev)
	71	{
	72	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
	73
	74	if (device_may_wakeup(dev))
	75	disable_irq_wake(pwrkey->key_press_irq);
	76
	77	return 0;
	78	}
	79	#endif
	80
	81	static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
	82	pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
	83
5298cc4c	84	static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
92d57a73 TS	85	{
	86	struct input_dev *pwr;
	87	int key_release_irq = platform_get_irq(pdev, 0);
	88	int key_press_irq = platform_get_irq(pdev, 1);
	89	int err;
	90	unsigned int delay;
1e63bd9c SB	91	unsigned int pon_cntl;
1e63bd9c SB	92	struct regmap *regmap;
92d57a73	93	struct pmic8xxx_pwrkey *pwrkey;
63ef1124 SO	94	const struct pm8xxx_pwrkey_platform_data *pdata =
63ef1124 SO	95	dev_get_platdata(&pdev->dev);
92d57a73 TS	96
	97	if (!pdata) {
	98	dev_err(&pdev->dev, "power key platform data not supplied\n");
	99	return -EINVAL;
	100	}
	101
	102	if (pdata->kpd_trigger_delay_us > 62500) {
	103	dev_err(&pdev->dev, "invalid power key trigger delay\n");
	104	return -EINVAL;
	105	}
	106
1e63bd9c SB	107	regmap = dev_get_regmap(pdev->dev.parent, NULL);
	108	if (!regmap) {
	109	dev_err(&pdev->dev, "failed to locate regmap for the device\n");
	110	return -ENODEV;
	111	}
	112
92d57a73 TS	113	pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
	114	if (!pwrkey)
	115	return -ENOMEM;
	116
	117	pwr = input_allocate_device();
	118	if (!pwr) {
	119	dev_dbg(&pdev->dev, "Can't allocate power button\n");
	120	err = -ENOMEM;
	121	goto free_pwrkey;
	122	}
	123
	124	input_set_capability(pwr, EV_KEY, KEY_POWER);
	125
	126	pwr->name = "pmic8xxx_pwrkey";
	127	pwr->phys = "pmic8xxx_pwrkey/input0";
	128	pwr->dev.parent = &pdev->dev;
	129
	130	delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
	131	delay = 1 + ilog2(delay);
	132
1e63bd9c	133	err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
92d57a73 TS	134	if (err < 0) {
	135	dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
	136	goto free_input_dev;
	137	}
	138
	139	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
	140	pon_cntl \|= (delay & PON_CNTL_TRIG_DELAY_MASK);
	141	if (pdata->pull_up)
	142	pon_cntl \|= PON_CNTL_PULL_UP;
	143	else
	144	pon_cntl &= ~PON_CNTL_PULL_UP;
	145
1e63bd9c	146	err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
92d57a73 TS	147	if (err < 0) {
	148	dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
	149	goto free_input_dev;
	150	}
	151
	152	err = input_register_device(pwr);
	153	if (err) {
	154	dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
	155	goto free_input_dev;
	156	}
	157
	158	pwrkey->key_press_irq = key_press_irq;
	159	pwrkey->pwr = pwr;
	160
	161	platform_set_drvdata(pdev, pwrkey);
	162
	163	err = request_irq(key_press_irq, pwrkey_press_irq,
b27f8fee	164	IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwr);
92d57a73 TS	165	if (err < 0) {
	166	dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
	167	key_press_irq, err);
	168	goto unreg_input_dev;
	169	}
	170
	171	err = request_irq(key_release_irq, pwrkey_release_irq,
b27f8fee	172	IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwr);
92d57a73 TS	173	if (err < 0) {
	174	dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
	175	key_release_irq, err);
	176
	177	goto free_press_irq;
	178	}
	179
	180	device_init_wakeup(&pdev->dev, pdata->wakeup);
	181
	182	return 0;
	183
	184	free_press_irq:
e77a715a	185	free_irq(key_press_irq, pwr);
92d57a73	186	unreg_input_dev:
92d57a73 TS	187	input_unregister_device(pwr);
	188	pwr = NULL;
	189	free_input_dev:
	190	input_free_device(pwr);
	191	free_pwrkey:
	192	kfree(pwrkey);
	193	return err;
	194	}
	195
e2619cf7	196	static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
92d57a73 TS	197	{
	198	struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
	199	int key_release_irq = platform_get_irq(pdev, 0);
	200	int key_press_irq = platform_get_irq(pdev, 1);
	201
	202	device_init_wakeup(&pdev->dev, 0);
	203
b27f8fee SB	204	free_irq(key_press_irq, pwrkey->pwr);
b27f8fee SB	205	free_irq(key_release_irq, pwrkey->pwr);
92d57a73	206	input_unregister_device(pwrkey->pwr);
92d57a73 TS	207	kfree(pwrkey);
	208
	209	return 0;
	210	}
	211
	212	static struct platform_driver pmic8xxx_pwrkey_driver = {
	213	.probe = pmic8xxx_pwrkey_probe,
1cb0aa88	214	.remove = pmic8xxx_pwrkey_remove,
92d57a73 TS	215	.driver = {
	216	.name = PM8XXX_PWRKEY_DEV_NAME,
	217	.owner = THIS_MODULE,
	218	.pm = &pm8xxx_pwr_key_pm_ops,
	219	},
	220	};
840a746b	221	module_platform_driver(pmic8xxx_pwrkey_driver);
92d57a73 TS	222
	223	MODULE_ALIAS("platform:pmic8xxx_pwrkey");
	224	MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
	225	MODULE_LICENSE("GPL v2");
	226	MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");