drivers/gpio/gpio-tc3589x.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) ST-Ericsson SA 2010
  *
  * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
  */

 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/gpio/driver.h>
 #include <linux/of.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/tc3589x.h>
 #include <linux/bitops.h>

 /*
  * These registers are modified under the irq bus lock and cached to avoid
  * unnecessary writes in bus_sync_unlock.
  */
 enum { REG_IBE, REG_IEV, REG_IS, REG_IE, REG_DIRECT };

 #define CACHE_NR_REGS	5
 #define CACHE_NR_BANKS	3

 struct tc3589x_gpio {
 	struct gpio_chip chip;
 	struct tc3589x *tc3589x;
 	struct device *dev;
 	struct mutex irq_lock;
 	/* Caches of interrupt control registers for bus_lock */
 	u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
 	u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
 };

 static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned int offset)
 {
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
 	u8 mask = BIT(offset % 8);
 	int ret;

 	ret = tc3589x_reg_read(tc3589x, reg);
 	if (ret < 0)
 		return ret;

 	return !!(ret & mask);
 }

 static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
 {
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
 	unsigned int pos = offset % 8;
 	u8 data[] = {val ? BIT(pos) : 0, BIT(pos)};

 	tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
 }

 static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
 					 unsigned int offset, int val)
 {
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	u8 reg = TC3589x_GPIODIR0 + offset / 8;
 	unsigned int pos = offset % 8;

 	tc3589x_gpio_set(chip, offset, val);

 	return tc3589x_set_bits(tc3589x, reg, BIT(pos), BIT(pos));
 }

 static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
 					unsigned int offset)
 {
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	u8 reg = TC3589x_GPIODIR0 + offset / 8;
 	unsigned int pos = offset % 8;

 	return tc3589x_set_bits(tc3589x, reg, BIT(pos), 0);
 }

 static int tc3589x_gpio_get_direction(struct gpio_chip *chip,
 				      unsigned int offset)
 {
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	u8 reg = TC3589x_GPIODIR0 + offset / 8;
 	unsigned int pos = offset % 8;
 	int ret;

 	ret = tc3589x_reg_read(tc3589x, reg);
 	if (ret < 0)
 		return ret;

 	if (ret & BIT(pos))
 		return GPIO_LINE_DIRECTION_OUT;

 	return GPIO_LINE_DIRECTION_IN;
 }

 static int tc3589x_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 				   unsigned long config)
 {
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	/*
 	 * These registers are alterated at each second address
 	 * ODM bit 0 = drive to GND or Hi-Z (open drain)
 	 * ODM bit 1 = drive to VDD or Hi-Z (open source)
 	 */
 	u8 odmreg = TC3589x_GPIOODM0 + (offset / 8) * 2;
 	u8 odereg = TC3589x_GPIOODE0 + (offset / 8) * 2;
 	unsigned int pos = offset % 8;
 	int ret;

 	switch (pinconf_to_config_param(config)) {
 	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 		/* Set open drain mode */
 		ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), 0);
 		if (ret)
 			return ret;
 		/* Enable open drain/source mode */
 		return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
 	case PIN_CONFIG_DRIVE_OPEN_SOURCE:
 		/* Set open source mode */
 		ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), BIT(pos));
 		if (ret)
 			return ret;
 		/* Enable open drain/source mode */
 		return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
 	case PIN_CONFIG_DRIVE_PUSH_PULL:
 		/* Disable open drain/source mode */
 		return tc3589x_set_bits(tc3589x, odereg, BIT(pos), 0);
 	default:
 		break;
 	}
 	return -ENOTSUPP;
 }

 static const struct gpio_chip template_chip = {
 	.label			= "tc3589x",
 	.owner			= THIS_MODULE,
 	.get			= tc3589x_gpio_get,
 	.set			= tc3589x_gpio_set,
 	.direction_output	= tc3589x_gpio_direction_output,
 	.direction_input	= tc3589x_gpio_direction_input,
 	.get_direction		= tc3589x_gpio_get_direction,
 	.set_config		= tc3589x_gpio_set_config,
 	.can_sleep		= true,
 };

 static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
 	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = BIT(offset % 8);

 	if (type == IRQ_TYPE_EDGE_BOTH) {
 		tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
 		return 0;
 	}

 	tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;

 	if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
 		tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
 	else
 		tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;

 	if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
 		tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
 	else
 		tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;

 	return 0;
 }

 static void tc3589x_gpio_irq_lock(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);

 	mutex_lock(&tc3589x_gpio->irq_lock);
 }

 static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	static const u8 regmap[] = {
 		[REG_IBE]	= TC3589x_GPIOIBE0,
 		[REG_IEV]	= TC3589x_GPIOIEV0,
 		[REG_IS]	= TC3589x_GPIOIS0,
 		[REG_IE]	= TC3589x_GPIOIE0,
 		[REG_DIRECT]	= TC3589x_DIRECT0,
 	};
 	int i, j;

 	for (i = 0; i < CACHE_NR_REGS; i++) {
 		for (j = 0; j < CACHE_NR_BANKS; j++) {
 			u8 old = tc3589x_gpio->oldregs[i][j];
 			u8 new = tc3589x_gpio->regs[i][j];

 			if (new == old)
 				continue;

 			tc3589x_gpio->oldregs[i][j] = new;
 			tc3589x_reg_write(tc3589x, regmap[i] + j, new);
 		}
 	}

 	mutex_unlock(&tc3589x_gpio->irq_lock);
 }

 static void tc3589x_gpio_irq_mask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
 	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = BIT(offset % 8);

 	tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
 	tc3589x_gpio->regs[REG_DIRECT][regoffset] |= mask;
 }

 static void tc3589x_gpio_irq_unmask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
 	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = BIT(offset % 8);

 	tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
 	tc3589x_gpio->regs[REG_DIRECT][regoffset] &= ~mask;
 }

 static struct irq_chip tc3589x_gpio_irq_chip = {
 	.name			= "tc3589x-gpio",
 	.irq_bus_lock		= tc3589x_gpio_irq_lock,
 	.irq_bus_sync_unlock	= tc3589x_gpio_irq_sync_unlock,
 	.irq_mask		= tc3589x_gpio_irq_mask,
 	.irq_unmask		= tc3589x_gpio_irq_unmask,
 	.irq_set_type		= tc3589x_gpio_irq_set_type,
 };

 static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
 {
 	struct tc3589x_gpio *tc3589x_gpio = dev;
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	u8 status[CACHE_NR_BANKS];
 	int ret;
 	int i;

 	ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
 				 ARRAY_SIZE(status), status);
 	if (ret < 0)
 		return IRQ_NONE;

 	for (i = 0; i < ARRAY_SIZE(status); i++) {
 		unsigned int stat = status[i];
 		if (!stat)
 			continue;

 		while (stat) {
 			int bit = __ffs(stat);
 			int line = i * 8 + bit;
 			int irq = irq_find_mapping(tc3589x_gpio->chip.irq.domain,
 						   line);

 			handle_nested_irq(irq);
 			stat &= ~(1 << bit);
 		}

 		tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
 	}

 	return IRQ_HANDLED;
 }

 static int tc3589x_gpio_probe(struct platform_device *pdev)
 {
 	struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
 	struct device_node *np = pdev->dev.of_node;
 	struct tc3589x_gpio *tc3589x_gpio;
 	struct gpio_irq_chip *girq;
 	int ret;
 	int irq;

 	if (!np) {
 		dev_err(&pdev->dev, "No Device Tree node found\n");
 		return -EINVAL;
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

 	tc3589x_gpio = devm_kzalloc(&pdev->dev, sizeof(struct tc3589x_gpio),
 				    GFP_KERNEL);
 	if (!tc3589x_gpio)
 		return -ENOMEM;

 	mutex_init(&tc3589x_gpio->irq_lock);

 	tc3589x_gpio->dev = &pdev->dev;
 	tc3589x_gpio->tc3589x = tc3589x;

 	tc3589x_gpio->chip = template_chip;
 	tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
 	tc3589x_gpio->chip.parent = &pdev->dev;
 	tc3589x_gpio->chip.base = -1;
 	tc3589x_gpio->chip.of_node = np;

 	girq = &tc3589x_gpio->chip.irq;
 	girq->chip = &tc3589x_gpio_irq_chip;
 	/* This will let us handle the parent IRQ in the driver */
 	girq->parent_handler = NULL;
 	girq->num_parents = 0;
 	girq->parents = NULL;
 	girq->default_type = IRQ_TYPE_NONE;
 	girq->handler = handle_simple_irq;
 	girq->threaded = true;

 	/* Bring the GPIO module out of reset */
 	ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
 			       TC3589x_RSTCTRL_GPIRST, 0);
 	if (ret < 0)
 		return ret;

 	 /* For tc35894, have to disable Direct KBD interrupts,
 	  * else IRQST will always be 0x20, IRQN low level, can't
 	  * clear the irq status.
 	  * TODO: need more test on other tc3589x chip.
 	  *
 	  */
 	ret = tc3589x_reg_write(tc3589x, TC3589x_DKBDMSK,
 			TC3589x_DKBDMSK_ELINT | TC3589x_DKBDMSK_EINT);
 	if (ret < 0)
 		return ret;

 	ret = devm_request_threaded_irq(&pdev->dev,
 					irq, NULL, tc3589x_gpio_irq,
 					IRQF_ONESHOT, "tc3589x-gpio",
 					tc3589x_gpio);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
 		return ret;
 	}

 	return devm_gpiochip_add_data(&pdev->dev, &tc3589x_gpio->chip, tc3589x_gpio);
 }

 static struct platform_driver tc3589x_gpio_driver = {
 	.driver.name	= "tc3589x-gpio",
 	.probe		= tc3589x_gpio_probe,
 };

 static int __init tc3589x_gpio_init(void)
 {
 	return platform_driver_register(&tc3589x_gpio_driver);
 }
 subsys_initcall(tc3589x_gpio_init);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (C) ST-Ericsson SA 2010
	*
	* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
	* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
	*/

	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/gpio/driver.h>
	#include <linux/of.h>
	#include <linux/interrupt.h>
	#include <linux/mfd/tc3589x.h>
	#include <linux/bitops.h>

	/*
	* These registers are modified under the irq bus lock and cached to avoid
	* unnecessary writes in bus_sync_unlock.
	*/
	enum { REG_IBE, REG_IEV, REG_IS, REG_IE, REG_DIRECT };

	#define CACHE_NR_REGS 5
	#define CACHE_NR_BANKS 3

	struct tc3589x_gpio {
	struct gpio_chip chip;
	struct tc3589x *tc3589x;
	struct device *dev;
	struct mutex irq_lock;
	/* Caches of interrupt control registers for bus_lock */
	u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
	u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
	};

	static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned int offset)
	{
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
	u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
	u8 mask = BIT(offset % 8);
	int ret;

	ret = tc3589x_reg_read(tc3589x, reg);
	if (ret < 0)
	return ret;

	return !!(ret & mask);
	}

	static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
	{
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
	u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
	unsigned int pos = offset % 8;
	u8 data[] = {val ? BIT(pos) : 0, BIT(pos)};

	tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
	}

	static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
	unsigned int offset, int val)
	{
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
	u8 reg = TC3589x_GPIODIR0 + offset / 8;
	unsigned int pos = offset % 8;

	tc3589x_gpio_set(chip, offset, val);

	return tc3589x_set_bits(tc3589x, reg, BIT(pos), BIT(pos));
	}

	static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
	unsigned int offset)
	{
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
	u8 reg = TC3589x_GPIODIR0 + offset / 8;
	unsigned int pos = offset % 8;

	return tc3589x_set_bits(tc3589x, reg, BIT(pos), 0);
	}

	static int tc3589x_gpio_get_direction(struct gpio_chip *chip,
	unsigned int offset)
	{
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
	u8 reg = TC3589x_GPIODIR0 + offset / 8;
	unsigned int pos = offset % 8;
	int ret;

	ret = tc3589x_reg_read(tc3589x, reg);
	if (ret < 0)
	return ret;

	if (ret & BIT(pos))
	return GPIO_LINE_DIRECTION_OUT;

	return GPIO_LINE_DIRECTION_IN;
	}

	static int tc3589x_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
	unsigned long config)
	{
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
	/*
	* These registers are alterated at each second address
	* ODM bit 0 = drive to GND or Hi-Z (open drain)
	* ODM bit 1 = drive to VDD or Hi-Z (open source)
	*/
	u8 odmreg = TC3589x_GPIOODM0 + (offset / 8) * 2;
	u8 odereg = TC3589x_GPIOODE0 + (offset / 8) * 2;
	unsigned int pos = offset % 8;
	int ret;

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
	/* Set open drain mode */
	ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), 0);
	if (ret)
	return ret;
	/* Enable open drain/source mode */
	return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
	case PIN_CONFIG_DRIVE_OPEN_SOURCE:
	/* Set open source mode */
	ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), BIT(pos));
	if (ret)
	return ret;
	/* Enable open drain/source mode */
	return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
	case PIN_CONFIG_DRIVE_PUSH_PULL:
	/* Disable open drain/source mode */
	return tc3589x_set_bits(tc3589x, odereg, BIT(pos), 0);
	default:
	break;
	}
	return -ENOTSUPP;
	}

	static const struct gpio_chip template_chip = {
	.label = "tc3589x",
	.owner = THIS_MODULE,
	.get = tc3589x_gpio_get,
	.set = tc3589x_gpio_set,
	.direction_output = tc3589x_gpio_direction_output,
	.direction_input = tc3589x_gpio_direction_input,
	.get_direction = tc3589x_gpio_get_direction,
	.set_config = tc3589x_gpio_set_config,
	.can_sleep = true,
	};

	static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
	int offset = d->hwirq;
	int regoffset = offset / 8;
	int mask = BIT(offset % 8);

	if (type == IRQ_TYPE_EDGE_BOTH) {
	tc3589x_gpio->regs[REG_IBE][regoffset] \|= mask;
	return 0;
	}

	tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;

	if (type == IRQ_TYPE_LEVEL_LOW \|\| type == IRQ_TYPE_LEVEL_HIGH)
	tc3589x_gpio->regs[REG_IS][regoffset] \|= mask;
	else
	tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;

	if (type == IRQ_TYPE_EDGE_RISING \|\| type == IRQ_TYPE_LEVEL_HIGH)
	tc3589x_gpio->regs[REG_IEV][regoffset] \|= mask;
	else
	tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;

	return 0;
	}

	static void tc3589x_gpio_irq_lock(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);

	mutex_lock(&tc3589x_gpio->irq_lock);
	}

	static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
	static const u8 regmap[] = {
	[REG_IBE] = TC3589x_GPIOIBE0,
	[REG_IEV] = TC3589x_GPIOIEV0,
	[REG_IS] = TC3589x_GPIOIS0,
	[REG_IE] = TC3589x_GPIOIE0,
	[REG_DIRECT] = TC3589x_DIRECT0,
	};
	int i, j;

	for (i = 0; i < CACHE_NR_REGS; i++) {
	for (j = 0; j < CACHE_NR_BANKS; j++) {
	u8 old = tc3589x_gpio->oldregs[i][j];
	u8 new = tc3589x_gpio->regs[i][j];

	if (new == old)
	continue;

	tc3589x_gpio->oldregs[i][j] = new;
	tc3589x_reg_write(tc3589x, regmap[i] + j, new);
	}
	}

	mutex_unlock(&tc3589x_gpio->irq_lock);
	}

	static void tc3589x_gpio_irq_mask(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
	int offset = d->hwirq;
	int regoffset = offset / 8;
	int mask = BIT(offset % 8);

	tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
	tc3589x_gpio->regs[REG_DIRECT][regoffset] \|= mask;
	}

	static void tc3589x_gpio_irq_unmask(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
	int offset = d->hwirq;
	int regoffset = offset / 8;
	int mask = BIT(offset % 8);

	tc3589x_gpio->regs[REG_IE][regoffset] \|= mask;
	tc3589x_gpio->regs[REG_DIRECT][regoffset] &= ~mask;
	}

	static struct irq_chip tc3589x_gpio_irq_chip = {
	.name = "tc3589x-gpio",
	.irq_bus_lock = tc3589x_gpio_irq_lock,
	.irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
	.irq_mask = tc3589x_gpio_irq_mask,
	.irq_unmask = tc3589x_gpio_irq_unmask,
	.irq_set_type = tc3589x_gpio_irq_set_type,
	};

	static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
	{
	struct tc3589x_gpio *tc3589x_gpio = dev;
	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
	u8 status[CACHE_NR_BANKS];
	int ret;
	int i;

	ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
	ARRAY_SIZE(status), status);
	if (ret < 0)
	return IRQ_NONE;

	for (i = 0; i < ARRAY_SIZE(status); i++) {
	unsigned int stat = status[i];
	if (!stat)
	continue;

	while (stat) {
	int bit = __ffs(stat);
	int line = i * 8 + bit;
	int irq = irq_find_mapping(tc3589x_gpio->chip.irq.domain,
	line);

	handle_nested_irq(irq);
	stat &= ~(1 << bit);
	}

	tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
	}

	return IRQ_HANDLED;
	}

	static int tc3589x_gpio_probe(struct platform_device *pdev)
	{
	struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
	struct device_node *np = pdev->dev.of_node;
	struct tc3589x_gpio *tc3589x_gpio;
	struct gpio_irq_chip *girq;
	int ret;
	int irq;

	if (!np) {
	dev_err(&pdev->dev, "No Device Tree node found\n");
	return -EINVAL;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	tc3589x_gpio = devm_kzalloc(&pdev->dev, sizeof(struct tc3589x_gpio),
	GFP_KERNEL);
	if (!tc3589x_gpio)
	return -ENOMEM;

	mutex_init(&tc3589x_gpio->irq_lock);

	tc3589x_gpio->dev = &pdev->dev;
	tc3589x_gpio->tc3589x = tc3589x;

	tc3589x_gpio->chip = template_chip;
	tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
	tc3589x_gpio->chip.parent = &pdev->dev;
	tc3589x_gpio->chip.base = -1;
	tc3589x_gpio->chip.of_node = np;

	girq = &tc3589x_gpio->chip.irq;
	girq->chip = &tc3589x_gpio_irq_chip;
	/* This will let us handle the parent IRQ in the driver */
	girq->parent_handler = NULL;
	girq->num_parents = 0;
	girq->parents = NULL;
	girq->default_type = IRQ_TYPE_NONE;
	girq->handler = handle_simple_irq;
	girq->threaded = true;

	/* Bring the GPIO module out of reset */
	ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
	TC3589x_RSTCTRL_GPIRST, 0);
	if (ret < 0)
	return ret;

	/* For tc35894, have to disable Direct KBD interrupts,
	* else IRQST will always be 0x20, IRQN low level, can't
	* clear the irq status.
	* TODO: need more test on other tc3589x chip.
	*
	*/
	ret = tc3589x_reg_write(tc3589x, TC3589x_DKBDMSK,
	TC3589x_DKBDMSK_ELINT \| TC3589x_DKBDMSK_EINT);
	if (ret < 0)
	return ret;

	ret = devm_request_threaded_irq(&pdev->dev,
	irq, NULL, tc3589x_gpio_irq,
	IRQF_ONESHOT, "tc3589x-gpio",
	tc3589x_gpio);
	if (ret) {
	dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
	return ret;
	}

	return devm_gpiochip_add_data(&pdev->dev, &tc3589x_gpio->chip, tc3589x_gpio);
	}

	static struct platform_driver tc3589x_gpio_driver = {
	.driver.name = "tc3589x-gpio",
	.probe = tc3589x_gpio_probe,
	};

	static int __init tc3589x_gpio_init(void)
	{
	return platform_driver_register(&tc3589x_gpio_driver);
	}
	subsys_initcall(tc3589x_gpio_init);