drivers/mfd/rn5t618.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * MFD core driver for Ricoh RN5T618 PMIC
  *
  * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
  * Copyright (C) 2016 Toradex AG
  */

 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/rn5t618.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/reboot.h>
 #include <linux/regmap.h>

 static const struct mfd_cell rn5t618_cells[] = {
 	{ .name = "rn5t618-regulator" },
 	{ .name = "rn5t618-wdt" },
 };

 static const struct mfd_cell rc5t619_cells[] = {
 	{ .name = "rn5t618-adc" },
 	{ .name = "rn5t618-power" },
 	{ .name = "rn5t618-regulator" },
 	{ .name = "rc5t619-rtc" },
 	{ .name = "rn5t618-wdt" },
 };

 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case RN5T618_WATCHDOGCNT:
 	case RN5T618_DCIRQ:
 	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
 	case RN5T618_ADCCNT3:
 	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
 	case RN5T618_IR_GPR:
 	case RN5T618_IR_GPF:
 	case RN5T618_MON_IOIN:
 	case RN5T618_INTMON:
 	case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
 	case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
 	case RN5T618_CHGCTL1:
 	case RN5T618_REGISET1 ... RN5T618_REGISET2:
 	case RN5T618_CHGSTATE:
 	case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
 	case RN5T618_GCHGDET:
 	case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
 		return true;
 	default:
 		return false;
 	}
 }

 static const struct regmap_config rn5t618_regmap_config = {
 	.reg_bits	= 8,
 	.val_bits	= 8,
 	.volatile_reg	= rn5t618_volatile_reg,
 	.max_register	= RN5T618_MAX_REG,
 	.cache_type	= REGCACHE_RBTREE,
 };

 static const struct regmap_irq rc5t619_irqs[] = {
 	REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
 	REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
 	REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
 	REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
 	REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
 	REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
 };

 static const struct regmap_irq_chip rc5t619_irq_chip = {
 	.name = "rc5t619",
 	.irqs = rc5t619_irqs,
 	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
 	.num_regs = 1,
 	.status_base = RN5T618_INTMON,
 	.unmask_base = RN5T618_INTEN,
 };

 static struct i2c_client *rn5t618_pm_power_off;
 static struct notifier_block rn5t618_restart_handler;

 static int rn5t618_irq_init(struct rn5t618 *rn5t618)
 {
 	const struct regmap_irq_chip *irq_chip = NULL;
 	int ret;

 	if (!rn5t618->irq)
 		return 0;

 	switch (rn5t618->variant) {
 	case RC5T619:
 		irq_chip = &rc5t619_irq_chip;
 		break;
 	default:
 		dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
 			(int)rn5t618->variant);
 		return -ENOENT;
 	}

 	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
 				       rn5t618->irq,
 				       IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 				       0, irq_chip, &rn5t618->irq_data);
 	if (ret)
 		dev_err(rn5t618->dev, "Failed to register IRQ chip\n");

 	return ret;
 }

 static void rn5t618_trigger_poweroff_sequence(bool repower)
 {
 	int ret;

 	/* disable automatic repower-on */
 	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
 	if (ret < 0)
 		goto err;

 	ret &= ~RN5T618_REPCNT_REPWRON;
 	if (repower)
 		ret |= RN5T618_REPCNT_REPWRON;

 	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
 					RN5T618_REPCNT, (u8)ret);
 	if (ret < 0)
 		goto err;

 	/* start power-off sequence */
 	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
 	if (ret < 0)
 		goto err;

 	ret |= RN5T618_SLPCNT_SWPWROFF;

 	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
 					RN5T618_SLPCNT, (u8)ret);
 	if (ret < 0)
 		goto err;

 	return;

 err:
 	dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
 }

 static void rn5t618_power_off(void)
 {
 	rn5t618_trigger_poweroff_sequence(false);
 }

 static int rn5t618_restart(struct notifier_block *this,
 			    unsigned long mode, void *cmd)
 {
 	rn5t618_trigger_poweroff_sequence(true);

 	/*
 	 * Re-power factor detection on PMIC side is not instant. 1ms
 	 * proved to be enough time until reset takes effect.
 	 */
 	mdelay(1);

 	return NOTIFY_DONE;
 }

 static const struct of_device_id rn5t618_of_match[] = {
 	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
 	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
 	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, rn5t618_of_match);

 static int rn5t618_i2c_probe(struct i2c_client *i2c)
 {
 	const struct of_device_id *of_id;
 	struct rn5t618 *priv;
 	int ret;

 	of_id = of_match_device(rn5t618_of_match, &i2c->dev);
 	if (!of_id) {
 		dev_err(&i2c->dev, "Failed to find matching DT ID\n");
 		return -EINVAL;
 	}

 	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	i2c_set_clientdata(i2c, priv);
 	priv->variant = (long)of_id->data;
 	priv->irq = i2c->irq;
 	priv->dev = &i2c->dev;

 	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
 	if (IS_ERR(priv->regmap)) {
 		ret = PTR_ERR(priv->regmap);
 		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 		return ret;
 	}

 	if (priv->variant == RC5T619)
 		ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
 					   rc5t619_cells,
 					   ARRAY_SIZE(rc5t619_cells),
 					   NULL, 0, NULL);
 	else
 		ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
 					   rn5t618_cells,
 					   ARRAY_SIZE(rn5t618_cells),
 					   NULL, 0, NULL);
 	if (ret) {
 		dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
 		return ret;
 	}

 	rn5t618_pm_power_off = i2c;
 	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
 		if (!pm_power_off)
 			pm_power_off = rn5t618_power_off;
 		else
 			dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
 	}

 	rn5t618_restart_handler.notifier_call = rn5t618_restart;
 	rn5t618_restart_handler.priority = 192;

 	ret = register_restart_handler(&rn5t618_restart_handler);
 	if (ret) {
 		dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
 		return ret;
 	}

 	return rn5t618_irq_init(priv);
 }

 static void rn5t618_i2c_remove(struct i2c_client *i2c)
 {
 	if (i2c == rn5t618_pm_power_off) {
 		rn5t618_pm_power_off = NULL;
 		pm_power_off = NULL;
 	}

 	unregister_restart_handler(&rn5t618_restart_handler);
 }

 static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
 {
 	struct rn5t618 *priv = dev_get_drvdata(dev);

 	if (priv->irq)
 		disable_irq(priv->irq);

 	return 0;
 }

 static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
 {
 	struct rn5t618 *priv = dev_get_drvdata(dev);

 	if (priv->irq)
 		enable_irq(priv->irq);

 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
 			rn5t618_i2c_suspend,
 			rn5t618_i2c_resume);

 static struct i2c_driver rn5t618_i2c_driver = {
 	.driver = {
 		.name = "rn5t618",
 		.of_match_table = of_match_ptr(rn5t618_of_match),
 		.pm = &rn5t618_i2c_dev_pm_ops,
 	},
 	.probe_new = rn5t618_i2c_probe,
 	.remove = rn5t618_i2c_remove,
 };

 module_i2c_driver(rn5t618_i2c_driver);

 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* MFD core driver for Ricoh RN5T618 PMIC
	*
	* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
	* Copyright (C) 2016 Toradex AG
	*/

	#include <linux/delay.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/rn5t618.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/reboot.h>
	#include <linux/regmap.h>

	static const struct mfd_cell rn5t618_cells[] = {
	{ .name = "rn5t618-regulator" },
	{ .name = "rn5t618-wdt" },
	};

	static const struct mfd_cell rc5t619_cells[] = {
	{ .name = "rn5t618-adc" },
	{ .name = "rn5t618-power" },
	{ .name = "rn5t618-regulator" },
	{ .name = "rc5t619-rtc" },
	{ .name = "rn5t618-wdt" },
	};

	static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case RN5T618_WATCHDOGCNT:
	case RN5T618_DCIRQ:
	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
	case RN5T618_ADCCNT3:
	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	case RN5T618_IR_GPR:
	case RN5T618_IR_GPF:
	case RN5T618_MON_IOIN:
	case RN5T618_INTMON:
	case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
	case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
	case RN5T618_CHGCTL1:
	case RN5T618_REGISET1 ... RN5T618_REGISET2:
	case RN5T618_CHGSTATE:
	case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
	case RN5T618_GCHGDET:
	case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
	return true;
	default:
	return false;
	}
	}

	static const struct regmap_config rn5t618_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = rn5t618_volatile_reg,
	.max_register = RN5T618_MAX_REG,
	.cache_type = REGCACHE_RBTREE,
	};

	static const struct regmap_irq rc5t619_irqs[] = {
	REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
	REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
	REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
	REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
	REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
	REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
	};

	static const struct regmap_irq_chip rc5t619_irq_chip = {
	.name = "rc5t619",
	.irqs = rc5t619_irqs,
	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
	.num_regs = 1,
	.status_base = RN5T618_INTMON,
	.unmask_base = RN5T618_INTEN,
	};

	static struct i2c_client *rn5t618_pm_power_off;
	static struct notifier_block rn5t618_restart_handler;

	static int rn5t618_irq_init(struct rn5t618 *rn5t618)
	{
	const struct regmap_irq_chip *irq_chip = NULL;
	int ret;

	if (!rn5t618->irq)
	return 0;

	switch (rn5t618->variant) {
	case RC5T619:
	irq_chip = &rc5t619_irq_chip;
	break;
	default:
	dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
	(int)rn5t618->variant);
	return -ENOENT;
	}

	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
	rn5t618->irq,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	0, irq_chip, &rn5t618->irq_data);
	if (ret)
	dev_err(rn5t618->dev, "Failed to register IRQ chip\n");

	return ret;
	}

	static void rn5t618_trigger_poweroff_sequence(bool repower)
	{
	int ret;

	/* disable automatic repower-on */
	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
	if (ret < 0)
	goto err;

	ret &= ~RN5T618_REPCNT_REPWRON;
	if (repower)
	ret \|= RN5T618_REPCNT_REPWRON;

	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
	RN5T618_REPCNT, (u8)ret);
	if (ret < 0)
	goto err;

	/* start power-off sequence */
	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
	if (ret < 0)
	goto err;

	ret \|= RN5T618_SLPCNT_SWPWROFF;

	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
	RN5T618_SLPCNT, (u8)ret);
	if (ret < 0)
	goto err;

	return;

	err:
	dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
	}

	static void rn5t618_power_off(void)
	{
	rn5t618_trigger_poweroff_sequence(false);
	}

	static int rn5t618_restart(struct notifier_block *this,
	unsigned long mode, void *cmd)
	{
	rn5t618_trigger_poweroff_sequence(true);

	/*
	* Re-power factor detection on PMIC side is not instant. 1ms
	* proved to be enough time until reset takes effect.
	*/
	mdelay(1);

	return NOTIFY_DONE;
	}

	static const struct of_device_id rn5t618_of_match[] = {
	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
	{ }
	};
	MODULE_DEVICE_TABLE(of, rn5t618_of_match);

	static int rn5t618_i2c_probe(struct i2c_client *i2c)
	{
	const struct of_device_id *of_id;
	struct rn5t618 *priv;
	int ret;

	of_id = of_match_device(rn5t618_of_match, &i2c->dev);
	if (!of_id) {
	dev_err(&i2c->dev, "Failed to find matching DT ID\n");
	return -EINVAL;
	}

	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	i2c_set_clientdata(i2c, priv);
	priv->variant = (long)of_id->data;
	priv->irq = i2c->irq;
	priv->dev = &i2c->dev;

	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	if (IS_ERR(priv->regmap)) {
	ret = PTR_ERR(priv->regmap);
	dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
	return ret;
	}

	if (priv->variant == RC5T619)
	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
	rc5t619_cells,
	ARRAY_SIZE(rc5t619_cells),
	NULL, 0, NULL);
	else
	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
	rn5t618_cells,
	ARRAY_SIZE(rn5t618_cells),
	NULL, 0, NULL);
	if (ret) {
	dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
	return ret;
	}

	rn5t618_pm_power_off = i2c;
	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
	if (!pm_power_off)
	pm_power_off = rn5t618_power_off;
	else
	dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
	}

	rn5t618_restart_handler.notifier_call = rn5t618_restart;
	rn5t618_restart_handler.priority = 192;

	ret = register_restart_handler(&rn5t618_restart_handler);
	if (ret) {
	dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
	return ret;
	}

	return rn5t618_irq_init(priv);
	}

	static void rn5t618_i2c_remove(struct i2c_client *i2c)
	{
	if (i2c == rn5t618_pm_power_off) {
	rn5t618_pm_power_off = NULL;
	pm_power_off = NULL;
	}

	unregister_restart_handler(&rn5t618_restart_handler);
	}

	static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
	{
	struct rn5t618 *priv = dev_get_drvdata(dev);

	if (priv->irq)
	disable_irq(priv->irq);

	return 0;
	}

	static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
	{
	struct rn5t618 *priv = dev_get_drvdata(dev);

	if (priv->irq)
	enable_irq(priv->irq);

	return 0;
	}

	static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
	rn5t618_i2c_suspend,
	rn5t618_i2c_resume);

	static struct i2c_driver rn5t618_i2c_driver = {
	.driver = {
	.name = "rn5t618",
	.of_match_table = of_match_ptr(rn5t618_of_match),
	.pm = &rn5t618_i2c_dev_pm_ops,
	},
	.probe_new = rn5t618_i2c_probe,
	.remove = rn5t618_i2c_remove,
	};

	module_i2c_driver(rn5t618_i2c_driver);

	MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
	MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
	MODULE_LICENSE("GPL v2");