drivers/input/misc/pm8941-pwrkey.c - linux - Git at Google

 /*
  * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
  * Copyright (c) 2014, Sony Mobile Communications Inc.
  *
  * 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/delay.h>
 #include <linux/errno.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/log2.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/reboot.h>
 #include <linux/regmap.h>

 #define PON_REV2			0x01

 #define PON_RT_STS			0x10
 #define  PON_KPDPWR_N_SET		BIT(0)

 #define PON_PS_HOLD_RST_CTL		0x5a
 #define PON_PS_HOLD_RST_CTL2		0x5b
 #define  PON_PS_HOLD_ENABLE		BIT(7)
 #define  PON_PS_HOLD_TYPE_MASK		0x0f
 #define  PON_PS_HOLD_TYPE_SHUTDOWN	4
 #define  PON_PS_HOLD_TYPE_HARD_RESET	7

 #define PON_PULL_CTL			0x70
 #define  PON_KPDPWR_PULL_UP		BIT(1)

 #define PON_DBC_CTL			0x71
 #define  PON_DBC_DELAY_MASK		0x7


 struct pm8941_pwrkey {
 	struct device *dev;
 	int irq;
 	u32 baseaddr;
 	struct regmap *regmap;
 	struct input_dev *input;

 	unsigned int revision;
 	struct notifier_block reboot_notifier;
 };

 static int pm8941_reboot_notify(struct notifier_block *nb,
 				unsigned long code, void *unused)
 {
 	struct pm8941_pwrkey *pwrkey = container_of(nb, struct pm8941_pwrkey,
 						    reboot_notifier);
 	unsigned int enable_reg;
 	unsigned int reset_type;
 	int error;

 	/* PMICs with revision 0 have the enable bit in same register as ctrl */
 	if (pwrkey->revision == 0)
 		enable_reg = PON_PS_HOLD_RST_CTL;
 	else
 		enable_reg = PON_PS_HOLD_RST_CTL2;

 	error = regmap_update_bits(pwrkey->regmap,
 				   pwrkey->baseaddr + enable_reg,
 				   PON_PS_HOLD_ENABLE,
 				   0);
 	if (error)
 		dev_err(pwrkey->dev,
 			"unable to clear ps hold reset enable: %d\n",
 			error);

 	/*
 	 * Updates of PON_PS_HOLD_ENABLE requires 3 sleep cycles between
 	 * writes.
 	 */
 	usleep_range(100, 1000);

 	switch (code) {
 	case SYS_HALT:
 	case SYS_POWER_OFF:
 		reset_type = PON_PS_HOLD_TYPE_SHUTDOWN;
 		break;
 	case SYS_RESTART:
 	default:
 		reset_type = PON_PS_HOLD_TYPE_HARD_RESET;
 		break;
 	}

 	error = regmap_update_bits(pwrkey->regmap,
 				   pwrkey->baseaddr + PON_PS_HOLD_RST_CTL,
 				   PON_PS_HOLD_TYPE_MASK,
 				   reset_type);
 	if (error)
 		dev_err(pwrkey->dev, "unable to set ps hold reset type: %d\n",
 			error);

 	error = regmap_update_bits(pwrkey->regmap,
 				   pwrkey->baseaddr + enable_reg,
 				   PON_PS_HOLD_ENABLE,
 				   PON_PS_HOLD_ENABLE);
 	if (error)
 		dev_err(pwrkey->dev, "unable to re-set enable: %d\n", error);

 	return NOTIFY_DONE;
 }

 static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data)
 {
 	struct pm8941_pwrkey *pwrkey = _data;
 	unsigned int sts;
 	int error;

 	error = regmap_read(pwrkey->regmap,
 			    pwrkey->baseaddr + PON_RT_STS, &sts);
 	if (error)
 		return IRQ_HANDLED;

 	input_report_key(pwrkey->input, KEY_POWER, !!(sts & PON_KPDPWR_N_SET));
 	input_sync(pwrkey->input);

 	return IRQ_HANDLED;
 }

 static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev)
 {
 	struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);

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

 	return 0;
 }

 static int __maybe_unused pm8941_pwrkey_resume(struct device *dev)
 {
 	struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);

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

 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops,
 			 pm8941_pwrkey_suspend, pm8941_pwrkey_resume);

 static int pm8941_pwrkey_probe(struct platform_device *pdev)
 {
 	struct pm8941_pwrkey *pwrkey;
 	bool pull_up;
 	u32 req_delay;
 	int error;

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

 	if (req_delay > 2000000 || req_delay == 0) {
 		dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay);
 		return -EINVAL;
 	}

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

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

 	pwrkey->dev = &pdev->dev;

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

 	pwrkey->irq = platform_get_irq(pdev, 0);
 	if (pwrkey->irq < 0) {
 		dev_err(&pdev->dev, "failed to get irq\n");
 		return pwrkey->irq;
 	}

 	error = of_property_read_u32(pdev->dev.of_node, "reg",
 				     &pwrkey->baseaddr);
 	if (error)
 		return error;

 	error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2,
 			    &pwrkey->revision);
 	if (error) {
 		dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
 		return error;
 	}

 	pwrkey->input = devm_input_allocate_device(&pdev->dev);
 	if (!pwrkey->input) {
 		dev_dbg(&pdev->dev, "unable to allocate input device\n");
 		return -ENOMEM;
 	}

 	input_set_capability(pwrkey->input, EV_KEY, KEY_POWER);

 	pwrkey->input->name = "pm8941_pwrkey";
 	pwrkey->input->phys = "pm8941_pwrkey/input0";

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

 	error = regmap_update_bits(pwrkey->regmap,
 				   pwrkey->baseaddr + PON_DBC_CTL,
 				   PON_DBC_DELAY_MASK,
 				   req_delay);
 	if (error) {
 		dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
 		return error;
 	}

 	error = regmap_update_bits(pwrkey->regmap,
 				   pwrkey->baseaddr + PON_PULL_CTL,
 				   PON_KPDPWR_PULL_UP,
 				   pull_up ? PON_KPDPWR_PULL_UP : 0);
 	if (error) {
 		dev_err(&pdev->dev, "failed to set pull: %d\n", error);
 		return error;
 	}

 	error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq,
 					  NULL, pm8941_pwrkey_irq,
 					  IRQF_ONESHOT,
 					  "pm8941_pwrkey", pwrkey);
 	if (error) {
 		dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error);
 		return error;
 	}

 	error = input_register_device(pwrkey->input);
 	if (error) {
 		dev_err(&pdev->dev, "failed to register input device: %d\n",
 			error);
 		return error;
 	}

 	pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify,
 	error = register_reboot_notifier(&pwrkey->reboot_notifier);
 	if (error) {
 		dev_err(&pdev->dev, "failed to register reboot notifier: %d\n",
 			error);
 		return error;
 	}

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

 	return 0;
 }

 static int pm8941_pwrkey_remove(struct platform_device *pdev)
 {
 	struct pm8941_pwrkey *pwrkey = platform_get_drvdata(pdev);

 	device_init_wakeup(&pdev->dev, 0);
 	unregister_reboot_notifier(&pwrkey->reboot_notifier);

 	return 0;
 }

 static const struct of_device_id pm8941_pwr_key_id_table[] = {
 	{ .compatible = "qcom,pm8941-pwrkey" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table);

 static struct platform_driver pm8941_pwrkey_driver = {
 	.probe = pm8941_pwrkey_probe,
 	.remove = pm8941_pwrkey_remove,
 	.driver = {
 		.name = "pm8941-pwrkey",
 		.pm = &pm8941_pwr_key_pm_ops,
 		.of_match_table = of_match_ptr(pm8941_pwr_key_id_table),
 	},
 };
 module_platform_driver(pm8941_pwrkey_driver);

 MODULE_DESCRIPTION("PM8941 Power Key driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
	* Copyright (c) 2014, Sony Mobile Communications Inc.
	*
	* 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/delay.h>
	#include <linux/errno.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/log2.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/reboot.h>
	#include <linux/regmap.h>

	#define PON_REV2 0x01

	#define PON_RT_STS 0x10
	#define PON_KPDPWR_N_SET BIT(0)

	#define PON_PS_HOLD_RST_CTL 0x5a
	#define PON_PS_HOLD_RST_CTL2 0x5b
	#define PON_PS_HOLD_ENABLE BIT(7)
	#define PON_PS_HOLD_TYPE_MASK 0x0f
	#define PON_PS_HOLD_TYPE_SHUTDOWN 4
	#define PON_PS_HOLD_TYPE_HARD_RESET 7

	#define PON_PULL_CTL 0x70
	#define PON_KPDPWR_PULL_UP BIT(1)

	#define PON_DBC_CTL 0x71
	#define PON_DBC_DELAY_MASK 0x7


	struct pm8941_pwrkey {
	struct device *dev;
	int irq;
	u32 baseaddr;
	struct regmap *regmap;
	struct input_dev *input;

	unsigned int revision;
	struct notifier_block reboot_notifier;
	};

	static int pm8941_reboot_notify(struct notifier_block *nb,
	unsigned long code, void *unused)
	{
	struct pm8941_pwrkey *pwrkey = container_of(nb, struct pm8941_pwrkey,
	reboot_notifier);
	unsigned int enable_reg;
	unsigned int reset_type;
	int error;

	/* PMICs with revision 0 have the enable bit in same register as ctrl */
	if (pwrkey->revision == 0)
	enable_reg = PON_PS_HOLD_RST_CTL;
	else
	enable_reg = PON_PS_HOLD_RST_CTL2;

	error = regmap_update_bits(pwrkey->regmap,
	pwrkey->baseaddr + enable_reg,
	PON_PS_HOLD_ENABLE,
	0);
	if (error)
	dev_err(pwrkey->dev,
	"unable to clear ps hold reset enable: %d\n",
	error);

	/*
	* Updates of PON_PS_HOLD_ENABLE requires 3 sleep cycles between
	* writes.
	*/
	usleep_range(100, 1000);

	switch (code) {
	case SYS_HALT:
	case SYS_POWER_OFF:
	reset_type = PON_PS_HOLD_TYPE_SHUTDOWN;
	break;
	case SYS_RESTART:
	default:
	reset_type = PON_PS_HOLD_TYPE_HARD_RESET;
	break;
	}

	error = regmap_update_bits(pwrkey->regmap,
	pwrkey->baseaddr + PON_PS_HOLD_RST_CTL,
	PON_PS_HOLD_TYPE_MASK,
	reset_type);
	if (error)
	dev_err(pwrkey->dev, "unable to set ps hold reset type: %d\n",
	error);

	error = regmap_update_bits(pwrkey->regmap,
	pwrkey->baseaddr + enable_reg,
	PON_PS_HOLD_ENABLE,
	PON_PS_HOLD_ENABLE);
	if (error)
	dev_err(pwrkey->dev, "unable to re-set enable: %d\n", error);

	return NOTIFY_DONE;
	}

	static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data)
	{
	struct pm8941_pwrkey *pwrkey = _data;
	unsigned int sts;
	int error;

	error = regmap_read(pwrkey->regmap,
	pwrkey->baseaddr + PON_RT_STS, &sts);
	if (error)
	return IRQ_HANDLED;

	input_report_key(pwrkey->input, KEY_POWER, !!(sts & PON_KPDPWR_N_SET));
	input_sync(pwrkey->input);

	return IRQ_HANDLED;
	}

	static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev)
	{
	struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);

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

	return 0;
	}

	static int __maybe_unused pm8941_pwrkey_resume(struct device *dev)
	{
	struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);

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

	return 0;
	}

	static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops,
	pm8941_pwrkey_suspend, pm8941_pwrkey_resume);

	static int pm8941_pwrkey_probe(struct platform_device *pdev)
	{
	struct pm8941_pwrkey *pwrkey;
	bool pull_up;
	u32 req_delay;
	int error;

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

	if (req_delay > 2000000 \|\| req_delay == 0) {
	dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay);
	return -EINVAL;
	}

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

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

	pwrkey->dev = &pdev->dev;

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

	pwrkey->irq = platform_get_irq(pdev, 0);
	if (pwrkey->irq < 0) {
	dev_err(&pdev->dev, "failed to get irq\n");
	return pwrkey->irq;
	}

	error = of_property_read_u32(pdev->dev.of_node, "reg",
	&pwrkey->baseaddr);
	if (error)
	return error;

	error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2,
	&pwrkey->revision);
	if (error) {
	dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
	return error;
	}

	pwrkey->input = devm_input_allocate_device(&pdev->dev);
	if (!pwrkey->input) {
	dev_dbg(&pdev->dev, "unable to allocate input device\n");
	return -ENOMEM;
	}

	input_set_capability(pwrkey->input, EV_KEY, KEY_POWER);

	pwrkey->input->name = "pm8941_pwrkey";
	pwrkey->input->phys = "pm8941_pwrkey/input0";

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

	error = regmap_update_bits(pwrkey->regmap,
	pwrkey->baseaddr + PON_DBC_CTL,
	PON_DBC_DELAY_MASK,
	req_delay);
	if (error) {
	dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
	return error;
	}

	error = regmap_update_bits(pwrkey->regmap,
	pwrkey->baseaddr + PON_PULL_CTL,
	PON_KPDPWR_PULL_UP,
	pull_up ? PON_KPDPWR_PULL_UP : 0);
	if (error) {
	dev_err(&pdev->dev, "failed to set pull: %d\n", error);
	return error;
	}

	error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq,
	NULL, pm8941_pwrkey_irq,
	IRQF_ONESHOT,
	"pm8941_pwrkey", pwrkey);
	if (error) {
	dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error);
	return error;
	}

	error = input_register_device(pwrkey->input);
	if (error) {
	dev_err(&pdev->dev, "failed to register input device: %d\n",
	error);
	return error;
	}

	pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify,
	error = register_reboot_notifier(&pwrkey->reboot_notifier);
	if (error) {
	dev_err(&pdev->dev, "failed to register reboot notifier: %d\n",
	error);
	return error;
	}

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

	return 0;
	}

	static int pm8941_pwrkey_remove(struct platform_device *pdev)
	{
	struct pm8941_pwrkey *pwrkey = platform_get_drvdata(pdev);

	device_init_wakeup(&pdev->dev, 0);
	unregister_reboot_notifier(&pwrkey->reboot_notifier);

	return 0;
	}

	static const struct of_device_id pm8941_pwr_key_id_table[] = {
	{ .compatible = "qcom,pm8941-pwrkey" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table);

	static struct platform_driver pm8941_pwrkey_driver = {
	.probe = pm8941_pwrkey_probe,
	.remove = pm8941_pwrkey_remove,
	.driver = {
	.name = "pm8941-pwrkey",
	.pm = &pm8941_pwr_key_pm_ops,
	.of_match_table = of_match_ptr(pm8941_pwr_key_id_table),
	},
	};
	module_platform_driver(pm8941_pwrkey_driver);

	MODULE_DESCRIPTION("PM8941 Power Key driver");
	MODULE_LICENSE("GPL v2");