drivers/input/misc/pmic8xxx-pwrkey.c - kernel/msm - Gitiles

 /* Copyright (c) 2010-2012, The Linux Foundation. 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/log2.h>

 #include <linux/mfd/pm8xxx/core.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
  * @pdata: platform data
  */
 struct pmic8xxx_pwrkey {
 	struct input_dev *pwr;
 	int key_press_irq;
 	int key_release_irq;
 	bool press;
 	const struct pm8xxx_pwrkey_platform_data *pdata;
 };

 static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
 {
 	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

 	if (pwrkey->press == true) {
 		pwrkey->press = false;
 		return IRQ_HANDLED;
 	} else {
 		pwrkey->press = true;
 	}

 	input_report_key(pwrkey->pwr, KEY_POWER, 1);
 	input_sync(pwrkey->pwr);

 	return IRQ_HANDLED;
 }

 static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
 {
 	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

 	if (pwrkey->press == false) {
 		input_report_key(pwrkey->pwr, KEY_POWER, 1);
 		input_sync(pwrkey->pwr);
 		pwrkey->press = true;
 	} else {
 		pwrkey->press = false;
 	}

 	input_report_key(pwrkey->pwr, KEY_POWER, 0);
 	input_sync(pwrkey->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);
 		enable_irq_wake(pwrkey->key_release_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);
 		disable_irq_wake(pwrkey->key_release_irq);
 	}

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
 		pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);

 static int __devinit 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;
 	u8 pon_cntl;
 	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;
 	}

 	/* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */
 	if (pdata->kpd_trigger_delay_us > USEC_PER_SEC * 2 ||
 		pdata->kpd_trigger_delay_us < USEC_PER_SEC / 64) {
 		dev_err(&pdev->dev, "invalid power key trigger delay\n");
 		return -EINVAL;
 	}

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

 	pwrkey->pdata = pdata;

 	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 << 6) / USEC_PER_SEC;
 	delay = ilog2(delay);

 	err = pm8xxx_readb(pdev->dev.parent, 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 = pm8xxx_writeb(pdev->dev.parent, 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->key_release_irq = key_release_irq;
 	pwrkey->pwr = pwr;

 	platform_set_drvdata(pdev, pwrkey);

 	/* check power key status during boot */
 	err = pm8xxx_read_irq_stat(pdev->dev.parent, key_press_irq);
 	if (err < 0) {
 		dev_err(&pdev->dev, "reading irq status failed\n");
 		goto unreg_input_dev;
 	}
 	pwrkey->press = !!err;

 	if (pwrkey->press) {
 		input_report_key(pwrkey->pwr, KEY_POWER, 1);
 		input_sync(pwrkey->pwr);
 	}

 	err = request_any_context_irq(key_press_irq, pwrkey_press_irq,
 		IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
 	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_any_context_irq(key_release_irq, pwrkey_release_irq,
 		 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
 	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, NULL);
 unreg_input_dev:
 	platform_set_drvdata(pdev, NULL);
 	input_unregister_device(pwr);
 	pwr = NULL;
 free_input_dev:
 	input_free_device(pwr);
 free_pwrkey:
 	kfree(pwrkey);
 	return err;
 }

 static int __devexit 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);
 	free_irq(key_release_irq, pwrkey);
 	input_unregister_device(pwrkey->pwr);
 	platform_set_drvdata(pdev, NULL);
 	kfree(pwrkey);

 	return 0;
 }

 static struct platform_driver pmic8xxx_pwrkey_driver = {
 	.probe		= pmic8xxx_pwrkey_probe,
 	.remove		= __devexit_p(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>");
	/* Copyright (c) 2010-2012, The Linux Foundation. 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/log2.h>

	#include <linux/mfd/pm8xxx/core.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
	* @pdata: platform data
	*/
	struct pmic8xxx_pwrkey {
	struct input_dev *pwr;
	int key_press_irq;
	int key_release_irq;
	bool press;
	const struct pm8xxx_pwrkey_platform_data *pdata;
	};

	static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
	{
	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

	if (pwrkey->press == true) {
	pwrkey->press = false;
	return IRQ_HANDLED;
	} else {
	pwrkey->press = true;
	}

	input_report_key(pwrkey->pwr, KEY_POWER, 1);
	input_sync(pwrkey->pwr);

	return IRQ_HANDLED;
	}

	static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
	{
	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

	if (pwrkey->press == false) {
	input_report_key(pwrkey->pwr, KEY_POWER, 1);
	input_sync(pwrkey->pwr);
	pwrkey->press = true;
	} else {
	pwrkey->press = false;
	}

	input_report_key(pwrkey->pwr, KEY_POWER, 0);
	input_sync(pwrkey->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);
	enable_irq_wake(pwrkey->key_release_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);
	disable_irq_wake(pwrkey->key_release_irq);
	}

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
	pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);

	static int __devinit 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;
	u8 pon_cntl;
	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;
	}

	/* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */
	if (pdata->kpd_trigger_delay_us > USEC_PER_SEC * 2 \|\|
	pdata->kpd_trigger_delay_us < USEC_PER_SEC / 64) {
	dev_err(&pdev->dev, "invalid power key trigger delay\n");
	return -EINVAL;
	}

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

	pwrkey->pdata = pdata;

	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 << 6) / USEC_PER_SEC;
	delay = ilog2(delay);

	err = pm8xxx_readb(pdev->dev.parent, 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 = pm8xxx_writeb(pdev->dev.parent, 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->key_release_irq = key_release_irq;
	pwrkey->pwr = pwr;

	platform_set_drvdata(pdev, pwrkey);

	/* check power key status during boot */
	err = pm8xxx_read_irq_stat(pdev->dev.parent, key_press_irq);
	if (err < 0) {
	dev_err(&pdev->dev, "reading irq status failed\n");
	goto unreg_input_dev;
	}
	pwrkey->press = !!err;

	if (pwrkey->press) {
	input_report_key(pwrkey->pwr, KEY_POWER, 1);
	input_sync(pwrkey->pwr);
	}

	err = request_any_context_irq(key_press_irq, pwrkey_press_irq,
	IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
	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_any_context_irq(key_release_irq, pwrkey_release_irq,
	IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
	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, NULL);
	unreg_input_dev:
	platform_set_drvdata(pdev, NULL);
	input_unregister_device(pwr);
	pwr = NULL;
	free_input_dev:
	input_free_device(pwr);
	free_pwrkey:
	kfree(pwrkey);
	return err;
	}

	static int __devexit 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);
	free_irq(key_release_irq, pwrkey);
	input_unregister_device(pwrkey->pwr);
	platform_set_drvdata(pdev, NULL);
	kfree(pwrkey);

	return 0;
	}

	static struct platform_driver pmic8xxx_pwrkey_driver = {
	.probe = pmic8xxx_pwrkey_probe,
	.remove = __devexit_p(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>");