drivers/input/misc/da9063_onkey.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OnKey device driver for DA9063, DA9062 and DA9061 PMICs
  * Copyright (C) 2015  Dialog Semiconductor Ltd.
  */

 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/workqueue.h>
 #include <linux/regmap.h>
 #include <linux/of.h>
 #include <linux/mfd/da9063/core.h>
 #include <linux/mfd/da9063/registers.h>
 #include <linux/mfd/da9062/core.h>
 #include <linux/mfd/da9062/registers.h>

 struct da906x_chip_config {
 	/* REGS */
 	int onkey_status;
 	int onkey_pwr_signalling;
 	int onkey_fault_log;
 	int onkey_shutdown;
 	/* MASKS */
 	int onkey_nonkey_mask;
 	int onkey_nonkey_lock_mask;
 	int onkey_key_reset_mask;
 	int onkey_shutdown_mask;
 	/* NAMES */
 	const char *name;
 };

 struct da9063_onkey {
 	struct delayed_work work;
 	struct input_dev *input;
 	struct device *dev;
 	struct regmap *regmap;
 	const struct da906x_chip_config *config;
 	char phys[32];
 	bool key_power;
 };

 static const struct da906x_chip_config da9063_regs = {
 	/* REGS */
 	.onkey_status = DA9063_REG_STATUS_A,
 	.onkey_pwr_signalling = DA9063_REG_CONTROL_B,
 	.onkey_fault_log = DA9063_REG_FAULT_LOG,
 	.onkey_shutdown = DA9063_REG_CONTROL_F,
 	/* MASKS */
 	.onkey_nonkey_mask = DA9063_NONKEY,
 	.onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
 	.onkey_key_reset_mask = DA9063_KEY_RESET,
 	.onkey_shutdown_mask = DA9063_SHUTDOWN,
 	/* NAMES */
 	.name = DA9063_DRVNAME_ONKEY,
 };

 static const struct da906x_chip_config da9062_regs = {
 	/* REGS */
 	.onkey_status = DA9062AA_STATUS_A,
 	.onkey_pwr_signalling = DA9062AA_CONTROL_B,
 	.onkey_fault_log = DA9062AA_FAULT_LOG,
 	.onkey_shutdown = DA9062AA_CONTROL_F,
 	/* MASKS */
 	.onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
 	.onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
 	.onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
 	.onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
 	/* NAMES */
 	.name = "da9062-onkey",
 };

 static const struct of_device_id da9063_compatible_reg_id_table[] = {
 	{ .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
 	{ .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);

 static void da9063_poll_on(struct work_struct *work)
 {
 	struct da9063_onkey *onkey = container_of(work,
 						struct da9063_onkey,
 						work.work);
 	const struct da906x_chip_config *config = onkey->config;
 	unsigned int val;
 	int fault_log = 0;
 	bool poll = true;
 	int error;

 	/* Poll to see when the pin is released */
 	error = regmap_read(onkey->regmap,
 			    config->onkey_status,
 			    &val);
 	if (error) {
 		dev_err(onkey->dev,
 			"Failed to read ON status: %d\n", error);
 		goto err_poll;
 	}

 	if (!(val & config->onkey_nonkey_mask)) {
 		error = regmap_update_bits(onkey->regmap,
 					   config->onkey_pwr_signalling,
 					   config->onkey_nonkey_lock_mask,
 					   0);
 		if (error) {
 			dev_err(onkey->dev,
 				"Failed to reset the Key Delay %d\n", error);
 			goto err_poll;
 		}

 		input_report_key(onkey->input, KEY_POWER, 0);
 		input_sync(onkey->input);

 		poll = false;
 	}

 	/*
 	 * If the fault log KEY_RESET is detected, then clear it
 	 * and shut down the system.
 	 */
 	error = regmap_read(onkey->regmap,
 			    config->onkey_fault_log,
 			    &fault_log);
 	if (error) {
 		dev_warn(&onkey->input->dev,
 			 "Cannot read FAULT_LOG: %d\n", error);
 	} else if (fault_log & config->onkey_key_reset_mask) {
 		error = regmap_write(onkey->regmap,
 				     config->onkey_fault_log,
 				     config->onkey_key_reset_mask);
 		if (error) {
 			dev_warn(&onkey->input->dev,
 				 "Cannot reset KEY_RESET fault log: %d\n",
 				 error);
 		} else {
 			/* at this point we do any S/W housekeeping
 			 * and then send shutdown command
 			 */
 			dev_dbg(&onkey->input->dev,
 				"Sending SHUTDOWN to PMIC ...\n");
 			error = regmap_write(onkey->regmap,
 					     config->onkey_shutdown,
 					     config->onkey_shutdown_mask);
 			if (error)
 				dev_err(&onkey->input->dev,
 					"Cannot SHUTDOWN PMIC: %d\n",
 					error);
 		}
 	}

 err_poll:
 	if (poll)
 		schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
 }

 static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
 {
 	struct da9063_onkey *onkey = data;
 	const struct da906x_chip_config *config = onkey->config;
 	unsigned int val;
 	int error;

 	error = regmap_read(onkey->regmap,
 			    config->onkey_status,
 			    &val);
 	if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
 		input_report_key(onkey->input, KEY_POWER, 1);
 		input_sync(onkey->input);
 		schedule_delayed_work(&onkey->work, 0);
 		dev_dbg(onkey->dev, "KEY_POWER long press.\n");
 	} else {
 		input_report_key(onkey->input, KEY_POWER, 1);
 		input_sync(onkey->input);
 		input_report_key(onkey->input, KEY_POWER, 0);
 		input_sync(onkey->input);
 		dev_dbg(onkey->dev, "KEY_POWER short press.\n");
 	}

 	return IRQ_HANDLED;
 }

 static void da9063_cancel_poll(void *data)
 {
 	struct da9063_onkey *onkey = data;

 	cancel_delayed_work_sync(&onkey->work);
 }

 static int da9063_onkey_probe(struct platform_device *pdev)
 {
 	struct da9063_onkey *onkey;
 	const struct of_device_id *match;
 	int irq;
 	int error;

 	match = of_match_node(da9063_compatible_reg_id_table,
 			      pdev->dev.of_node);
 	if (!match)
 		return -ENXIO;

 	onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
 			     GFP_KERNEL);
 	if (!onkey) {
 		dev_err(&pdev->dev, "Failed to allocate memory.\n");
 		return -ENOMEM;
 	}

 	onkey->config = match->data;
 	onkey->dev = &pdev->dev;

 	onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!onkey->regmap) {
 		dev_err(&pdev->dev, "Parent regmap unavailable.\n");
 		return -ENXIO;
 	}

 	onkey->key_power = !of_property_read_bool(pdev->dev.of_node,
 						  "dlg,disable-key-power");

 	onkey->input = devm_input_allocate_device(&pdev->dev);
 	if (!onkey->input) {
 		dev_err(&pdev->dev, "Failed to allocated input device.\n");
 		return -ENOMEM;
 	}

 	onkey->input->name = onkey->config->name;
 	snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
 		 onkey->config->name);
 	onkey->input->phys = onkey->phys;
 	onkey->input->dev.parent = &pdev->dev;

 	if (onkey->key_power)
 		input_set_capability(onkey->input, EV_KEY, KEY_POWER);

 	input_set_capability(onkey->input, EV_KEY, KEY_SLEEP);

 	INIT_DELAYED_WORK(&onkey->work, da9063_poll_on);

 	error = devm_add_action(&pdev->dev, da9063_cancel_poll, onkey);
 	if (error) {
 		dev_err(&pdev->dev,
 			"Failed to add cancel poll action: %d\n",
 			error);
 		return error;
 	}

 	irq = platform_get_irq_byname(pdev, "ONKEY");
 	if (irq < 0)
 		return irq;

 	error = devm_request_threaded_irq(&pdev->dev, irq,
 					  NULL, da9063_onkey_irq_handler,
 					  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 					  "ONKEY", onkey);
 	if (error) {
 		dev_err(&pdev->dev,
 			"Failed to request IRQ %d: %d\n", irq, error);
 		return error;
 	}

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

 	return 0;
 }

 static struct platform_driver da9063_onkey_driver = {
 	.probe	= da9063_onkey_probe,
 	.driver	= {
 		.name	= DA9063_DRVNAME_ONKEY,
 		.of_match_table = da9063_compatible_reg_id_table,
 	},
 };
 module_platform_driver(da9063_onkey_driver);

 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* OnKey device driver for DA9063, DA9062 and DA9061 PMICs
	* Copyright (C) 2015 Dialog Semiconductor Ltd.
	*/

	#include <linux/module.h>
	#include <linux/errno.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/workqueue.h>
	#include <linux/regmap.h>
	#include <linux/of.h>
	#include <linux/mfd/da9063/core.h>
	#include <linux/mfd/da9063/registers.h>
	#include <linux/mfd/da9062/core.h>
	#include <linux/mfd/da9062/registers.h>

	struct da906x_chip_config {
	/* REGS */
	int onkey_status;
	int onkey_pwr_signalling;
	int onkey_fault_log;
	int onkey_shutdown;
	/* MASKS */
	int onkey_nonkey_mask;
	int onkey_nonkey_lock_mask;
	int onkey_key_reset_mask;
	int onkey_shutdown_mask;
	/* NAMES */
	const char *name;
	};

	struct da9063_onkey {
	struct delayed_work work;
	struct input_dev *input;
	struct device *dev;
	struct regmap *regmap;
	const struct da906x_chip_config *config;
	char phys[32];
	bool key_power;
	};

	static const struct da906x_chip_config da9063_regs = {
	/* REGS */
	.onkey_status = DA9063_REG_STATUS_A,
	.onkey_pwr_signalling = DA9063_REG_CONTROL_B,
	.onkey_fault_log = DA9063_REG_FAULT_LOG,
	.onkey_shutdown = DA9063_REG_CONTROL_F,
	/* MASKS */
	.onkey_nonkey_mask = DA9063_NONKEY,
	.onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
	.onkey_key_reset_mask = DA9063_KEY_RESET,
	.onkey_shutdown_mask = DA9063_SHUTDOWN,
	/* NAMES */
	.name = DA9063_DRVNAME_ONKEY,
	};

	static const struct da906x_chip_config da9062_regs = {
	/* REGS */
	.onkey_status = DA9062AA_STATUS_A,
	.onkey_pwr_signalling = DA9062AA_CONTROL_B,
	.onkey_fault_log = DA9062AA_FAULT_LOG,
	.onkey_shutdown = DA9062AA_CONTROL_F,
	/* MASKS */
	.onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
	.onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
	.onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
	.onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
	/* NAMES */
	.name = "da9062-onkey",
	};

	static const struct of_device_id da9063_compatible_reg_id_table[] = {
	{ .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
	{ .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
	{ },
	};
	MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);

	static void da9063_poll_on(struct work_struct *work)
	{
	struct da9063_onkey *onkey = container_of(work,
	struct da9063_onkey,
	work.work);
	const struct da906x_chip_config *config = onkey->config;
	unsigned int val;
	int fault_log = 0;
	bool poll = true;
	int error;

	/* Poll to see when the pin is released */
	error = regmap_read(onkey->regmap,
	config->onkey_status,
	&val);
	if (error) {
	dev_err(onkey->dev,
	"Failed to read ON status: %d\n", error);
	goto err_poll;
	}

	if (!(val & config->onkey_nonkey_mask)) {
	error = regmap_update_bits(onkey->regmap,
	config->onkey_pwr_signalling,
	config->onkey_nonkey_lock_mask,
	0);
	if (error) {
	dev_err(onkey->dev,
	"Failed to reset the Key Delay %d\n", error);
	goto err_poll;
	}

	input_report_key(onkey->input, KEY_POWER, 0);
	input_sync(onkey->input);

	poll = false;
	}

	/*
	* If the fault log KEY_RESET is detected, then clear it
	* and shut down the system.
	*/
	error = regmap_read(onkey->regmap,
	config->onkey_fault_log,
	&fault_log);
	if (error) {
	dev_warn(&onkey->input->dev,
	"Cannot read FAULT_LOG: %d\n", error);
	} else if (fault_log & config->onkey_key_reset_mask) {
	error = regmap_write(onkey->regmap,
	config->onkey_fault_log,
	config->onkey_key_reset_mask);
	if (error) {
	dev_warn(&onkey->input->dev,
	"Cannot reset KEY_RESET fault log: %d\n",
	error);
	} else {
	/* at this point we do any S/W housekeeping
	* and then send shutdown command
	*/
	dev_dbg(&onkey->input->dev,
	"Sending SHUTDOWN to PMIC ...\n");
	error = regmap_write(onkey->regmap,
	config->onkey_shutdown,
	config->onkey_shutdown_mask);
	if (error)
	dev_err(&onkey->input->dev,
	"Cannot SHUTDOWN PMIC: %d\n",
	error);
	}
	}

	err_poll:
	if (poll)
	schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
	}

	static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
	{
	struct da9063_onkey *onkey = data;
	const struct da906x_chip_config *config = onkey->config;
	unsigned int val;
	int error;

	error = regmap_read(onkey->regmap,
	config->onkey_status,
	&val);
	if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
	input_report_key(onkey->input, KEY_POWER, 1);
	input_sync(onkey->input);
	schedule_delayed_work(&onkey->work, 0);
	dev_dbg(onkey->dev, "KEY_POWER long press.\n");
	} else {
	input_report_key(onkey->input, KEY_POWER, 1);
	input_sync(onkey->input);
	input_report_key(onkey->input, KEY_POWER, 0);
	input_sync(onkey->input);
	dev_dbg(onkey->dev, "KEY_POWER short press.\n");
	}

	return IRQ_HANDLED;
	}

	static void da9063_cancel_poll(void *data)
	{
	struct da9063_onkey *onkey = data;

	cancel_delayed_work_sync(&onkey->work);
	}

	static int da9063_onkey_probe(struct platform_device *pdev)
	{
	struct da9063_onkey *onkey;
	const struct of_device_id *match;
	int irq;
	int error;

	match = of_match_node(da9063_compatible_reg_id_table,
	pdev->dev.of_node);
	if (!match)
	return -ENXIO;

	onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
	GFP_KERNEL);
	if (!onkey) {
	dev_err(&pdev->dev, "Failed to allocate memory.\n");
	return -ENOMEM;
	}

	onkey->config = match->data;
	onkey->dev = &pdev->dev;

	onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!onkey->regmap) {
	dev_err(&pdev->dev, "Parent regmap unavailable.\n");
	return -ENXIO;
	}

	onkey->key_power = !of_property_read_bool(pdev->dev.of_node,
	"dlg,disable-key-power");

	onkey->input = devm_input_allocate_device(&pdev->dev);
	if (!onkey->input) {
	dev_err(&pdev->dev, "Failed to allocated input device.\n");
	return -ENOMEM;
	}

	onkey->input->name = onkey->config->name;
	snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
	onkey->config->name);
	onkey->input->phys = onkey->phys;
	onkey->input->dev.parent = &pdev->dev;

	if (onkey->key_power)
	input_set_capability(onkey->input, EV_KEY, KEY_POWER);

	input_set_capability(onkey->input, EV_KEY, KEY_SLEEP);

	INIT_DELAYED_WORK(&onkey->work, da9063_poll_on);

	error = devm_add_action(&pdev->dev, da9063_cancel_poll, onkey);
	if (error) {
	dev_err(&pdev->dev,
	"Failed to add cancel poll action: %d\n",
	error);
	return error;
	}

	irq = platform_get_irq_byname(pdev, "ONKEY");
	if (irq < 0)
	return irq;

	error = devm_request_threaded_irq(&pdev->dev, irq,
	NULL, da9063_onkey_irq_handler,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	"ONKEY", onkey);
	if (error) {
	dev_err(&pdev->dev,
	"Failed to request IRQ %d: %d\n", irq, error);
	return error;
	}

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

	return 0;
	}

	static struct platform_driver da9063_onkey_driver = {
	.probe = da9063_onkey_probe,
	.driver = {
	.name = DA9063_DRVNAME_ONKEY,
	.of_match_table = da9063_compatible_reg_id_table,
	},
	};
	module_platform_driver(da9063_onkey_driver);

	MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
	MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);