[mirror_ubuntu-hirsute-kernel.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/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/of.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 {
	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;
	u32 kpd_delay;
	bool pull_up;

	if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
		kpd_delay = 15625;

	if (kpd_delay > 62500 || kpd_delay == 0) {
		dev_err(&pdev->dev, "invalid power key trigger delay\n");
		return -EINVAL;
	}

	pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");

	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 = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
	if (!pwrkey)
		return -ENOMEM;

	pwrkey->key_press_irq = key_press_irq;

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

	input_set_capability(pwr, EV_KEY, KEY_POWER);

	pwr->name = "pmic8xxx_pwrkey";
	pwr->phys = "pmic8xxx_pwrkey/input0";

	delay = (kpd_delay << 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);
		return err;
	}

	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
	pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
	if (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);
		return err;
	}

	err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
			       IRQF_TRIGGER_RISING,
			       "pmic8xxx_pwrkey_press", pwr);
	if (err) {
		dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
			key_press_irq, err);
		return err;
	}

	err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
			       IRQF_TRIGGER_RISING,
			       "pmic8xxx_pwrkey_release", pwr);
	if (err) {
		dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
			key_release_irq, err);
		return err;
	}

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

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

	return 0;
}

static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
{
	device_init_wakeup(&pdev->dev, 0);

	return 0;
}

static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
	{ .compatible = "qcom,pm8058-pwrkey" },
	{ .compatible = "qcom,pm8921-pwrkey" },
	{ }
};
MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);

static struct platform_driver pmic8xxx_pwrkey_driver = {
	.probe		= pmic8xxx_pwrkey_probe,
	.remove		= pmic8xxx_pwrkey_remove,
	.driver		= {
		.name	= "pm8xxx-pwrkey",
		.owner	= THIS_MODULE,
		.pm	= &pm8xxx_pwr_key_pm_ops,
		.of_match_table = pm8xxx_pwr_key_id_table,
	},
};
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>
92d57a73 TS	14	#include <linux/kernel.h>
	15	#include <linux/errno.h>
	16	#include <linux/slab.h>
	17	#include <linux/input.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/platform_device.h>
1e63bd9c	20	#include <linux/regmap.h>
92d57a73	21	#include <linux/log2.h>
57918dfa	22	#include <linux/of.h>
92d57a73 TS	23
	24	#define PON_CNTL_1 0x1C
	25	#define PON_CNTL_PULL_UP BIT(7)
	26	#define PON_CNTL_TRIG_DELAY_MASK (0x7)
	27
	28	/**
	29	* struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
	30	* @key_press_irq: key press irq number
	31	*/
	32	struct pmic8xxx_pwrkey {
92d57a73 TS	33	int key_press_irq;
	34	};
	35
b27f8fee	36	static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
92d57a73	37	{
b27f8fee	38	struct input_dev *pwr = _pwr;
92d57a73	39
b27f8fee SB	40	input_report_key(pwr, KEY_POWER, 1);
b27f8fee SB	41	input_sync(pwr);
92d57a73 TS	42
	43	return IRQ_HANDLED;
	44	}
	45
b27f8fee	46	static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
92d57a73	47	{
b27f8fee	48	struct input_dev *pwr = _pwr;
92d57a73	49
b27f8fee SB	50	input_report_key(pwr, KEY_POWER, 0);
b27f8fee SB	51	input_sync(pwr);
92d57a73 TS	52
	53	return IRQ_HANDLED;
	54	}
	55
	56	#ifdef CONFIG_PM_SLEEP
	57	static int pmic8xxx_pwrkey_suspend(struct device *dev)
	58	{
	59	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
	60
	61	if (device_may_wakeup(dev))
	62	enable_irq_wake(pwrkey->key_press_irq);
	63
	64	return 0;
	65	}
	66
	67	static int pmic8xxx_pwrkey_resume(struct device *dev)
	68	{
	69	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
	70
	71	if (device_may_wakeup(dev))
	72	disable_irq_wake(pwrkey->key_press_irq);
	73
	74	return 0;
	75	}
	76	#endif
	77
	78	static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
	79	pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
	80
5298cc4c	81	static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
92d57a73 TS	82	{
	83	struct input_dev *pwr;
	84	int key_release_irq = platform_get_irq(pdev, 0);
	85	int key_press_irq = platform_get_irq(pdev, 1);
	86	int err;
	87	unsigned int delay;
1e63bd9c SB	88	unsigned int pon_cntl;
1e63bd9c SB	89	struct regmap *regmap;
92d57a73	90	struct pmic8xxx_pwrkey *pwrkey;
57918dfa SB	91	u32 kpd_delay;
57918dfa SB	92	bool pull_up;
92d57a73	93
57918dfa	94	if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
70a26071	95	kpd_delay = 15625;
92d57a73	96
70a26071	97	if (kpd_delay > 62500 \|\| kpd_delay == 0) {
92d57a73 TS	98	dev_err(&pdev->dev, "invalid power key trigger delay\n");
	99	return -EINVAL;
	100	}
	101
70a26071 SB	102	pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
70a26071 SB	103
1e63bd9c SB	104	regmap = dev_get_regmap(pdev->dev.parent, NULL);
	105	if (!regmap) {
	106	dev_err(&pdev->dev, "failed to locate regmap for the device\n");
	107	return -ENODEV;
	108	}
	109
eb735d3b	110	pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
92d57a73 TS	111	if (!pwrkey)
	112	return -ENOMEM;
	113
eb735d3b DT	114	pwrkey->key_press_irq = key_press_irq;
	115
	116	pwr = devm_input_allocate_device(&pdev->dev);
92d57a73 TS	117	if (!pwr) {
92d57a73 TS	118	dev_dbg(&pdev->dev, "Can't allocate power button\n");
eb735d3b	119	return -ENOMEM;
92d57a73 TS	120	}
	121
	122	input_set_capability(pwr, EV_KEY, KEY_POWER);
	123
	124	pwr->name = "pmic8xxx_pwrkey";
	125	pwr->phys = "pmic8xxx_pwrkey/input0";
92d57a73	126
57918dfa	127	delay = (kpd_delay << 10) / USEC_PER_SEC;
92d57a73 TS	128	delay = 1 + ilog2(delay);
92d57a73 TS	129
1e63bd9c	130	err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
92d57a73 TS	131	if (err < 0) {
92d57a73 TS	132	dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
eb735d3b	133	return err;
92d57a73 TS	134	}
	135
	136	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
	137	pon_cntl \|= (delay & PON_CNTL_TRIG_DELAY_MASK);
57918dfa	138	if (pull_up)
92d57a73 TS	139	pon_cntl \|= PON_CNTL_PULL_UP;
	140	else
	141	pon_cntl &= ~PON_CNTL_PULL_UP;
	142
1e63bd9c	143	err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
92d57a73 TS	144	if (err < 0) {
92d57a73 TS	145	dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
eb735d3b	146	return err;
92d57a73 TS	147	}
92d57a73 TS	148
eb735d3b DT	149	err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
	150	IRQF_TRIGGER_RISING,
	151	"pmic8xxx_pwrkey_press", pwr);
92d57a73	152	if (err) {
eb735d3b DT	153	dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
	154	key_press_irq, err);
	155	return err;
92d57a73 TS	156	}
92d57a73 TS	157
eb735d3b DT	158	err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
	159	IRQF_TRIGGER_RISING,
	160	"pmic8xxx_pwrkey_release", pwr);
	161	if (err) {
	162	dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
	163	key_release_irq, err);
	164	return err;
92d57a73 TS	165	}
92d57a73 TS	166
eb735d3b DT	167	err = input_register_device(pwr);
	168	if (err) {
	169	dev_err(&pdev->dev, "Can't register power key: %d\n", err);
	170	return err;
92d57a73 TS	171	}
92d57a73 TS	172
eb735d3b	173	platform_set_drvdata(pdev, pwrkey);
57918dfa	174	device_init_wakeup(&pdev->dev, 1);
92d57a73 TS	175
92d57a73 TS	176	return 0;
92d57a73 TS	177	}
92d57a73 TS	178
e2619cf7	179	static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
92d57a73	180	{
92d57a73 TS	181	device_init_wakeup(&pdev->dev, 0);
92d57a73 TS	182
92d57a73 TS	183	return 0;
	184	}
	185
57918dfa SB	186	static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
	187	{ .compatible = "qcom,pm8058-pwrkey" },
	188	{ .compatible = "qcom,pm8921-pwrkey" },
	189	{ }
	190	};
	191	MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
	192
92d57a73 TS	193	static struct platform_driver pmic8xxx_pwrkey_driver = {
92d57a73 TS	194	.probe = pmic8xxx_pwrkey_probe,
1cb0aa88	195	.remove = pmic8xxx_pwrkey_remove,
92d57a73	196	.driver = {
57918dfa	197	.name = "pm8xxx-pwrkey",
92d57a73 TS	198	.owner = THIS_MODULE,
92d57a73 TS	199	.pm = &pm8xxx_pwr_key_pm_ops,
57918dfa	200	.of_match_table = pm8xxx_pwr_key_id_table,
92d57a73 TS	201	},
92d57a73 TS	202	};
840a746b	203	module_platform_driver(pmic8xxx_pwrkey_driver);
92d57a73 TS	204
	205	MODULE_ALIAS("platform:pmic8xxx_pwrkey");
	206	MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
	207	MODULE_LICENSE("GPL v2");
	208	MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");