Message-Id: <20130209140153.A0EBE3E30EC@localhost>
Date:	Sat, 09 Feb 2013 14:01:53 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	Anmar Oueja <anmar.oueja@...aro.org>,
	Lee Jones <lee.jones@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH 2/4] gpio: delete AB8500 driver

On Tue, 15 Jan 2013 10:42:55 +0100, Linus Walleij <linus.walleij@...ricsson.com> wrote:
> From: Linus Walleij <linus.walleij@...aro.org>
> 
> The AB8500 GPIO driver has been marked BROKEN for ages, and we
> have something better in store: a shiny new pinctrl driver. So
> let use delete this old driver as the first step.
> 
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

Acked-by: Grant Likely <grant.likely@...retlab.ca>

I'm assuming you'll put this into your for-next branch.

g.

> ---
>  drivers/gpio/Kconfig       |   6 -
>  drivers/gpio/Makefile      |   1 -
>  drivers/gpio/gpio-ab8500.c | 520 ---------------------------------------------
>  3 files changed, 527 deletions(-)
>  delete mode 100644 drivers/gpio/gpio-ab8500.c
> 
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 682de75..e5116fa 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -657,12 +657,6 @@ config GPIO_JANZ_TTL
>  	  This driver provides support for driving the pins in output
>  	  mode only. Input mode is not supported.
>  
> -config GPIO_AB8500
> -	bool "ST-Ericsson AB8500 Mixed Signal Circuit gpio functions"
> -	depends on AB8500_CORE && BROKEN
> -	help
> -	  Select this to enable the AB8500 IC GPIO driver
> -
>  config GPIO_TPS6586X
>  	bool "TPS6586X GPIO"
>  	depends on MFD_TPS6586X
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index c5aebd0..45a388c 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -10,7 +10,6 @@ obj-$(CONFIG_GPIO_ACPI)		+= gpiolib-acpi.o
>  obj-$(CONFIG_GPIO_GENERIC)	+= gpio-generic.o
>  
>  obj-$(CONFIG_GPIO_74X164)	+= gpio-74x164.o
> -obj-$(CONFIG_GPIO_AB8500)	+= gpio-ab8500.o
>  obj-$(CONFIG_GPIO_ADNP)		+= gpio-adnp.o
>  obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
>  obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
> diff --git a/drivers/gpio/gpio-ab8500.c b/drivers/gpio/gpio-ab8500.c
> deleted file mode 100644
> index 983ad42..0000000
> --- a/drivers/gpio/gpio-ab8500.c
> +++ /dev/null
> @@ -1,520 +0,0 @@
> -/*
> - * Copyright (C) ST-Ericsson SA 2011
> - *
> - * Author: BIBEK BASU <bibek.basu@...ricsson.com>
> - * License terms: GNU General Public License (GPL) version 2
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License version 2 as
> - * published by the Free Software Foundation.
> - */
> -#include <linux/kernel.h>
> -#include <linux/types.h>
> -#include <linux/slab.h>
> -#include <linux/init.h>
> -#include <linux/module.h>
> -#include <linux/err.h>
> -#include <linux/platform_device.h>
> -#include <linux/gpio.h>
> -#include <linux/irq.h>
> -#include <linux/interrupt.h>
> -#include <linux/mfd/ab8500.h>
> -#include <linux/mfd/abx500.h>
> -#include <linux/mfd/ab8500/gpio.h>
> -
> -/*
> - * GPIO registers offset
> - * Bank: 0x10
> - */
> -#define AB8500_GPIO_SEL1_REG	0x00
> -#define AB8500_GPIO_SEL2_REG	0x01
> -#define AB8500_GPIO_SEL3_REG	0x02
> -#define AB8500_GPIO_SEL4_REG	0x03
> -#define AB8500_GPIO_SEL5_REG	0x04
> -#define AB8500_GPIO_SEL6_REG	0x05
> -
> -#define AB8500_GPIO_DIR1_REG	0x10
> -#define AB8500_GPIO_DIR2_REG	0x11
> -#define AB8500_GPIO_DIR3_REG	0x12
> -#define AB8500_GPIO_DIR4_REG	0x13
> -#define AB8500_GPIO_DIR5_REG	0x14
> -#define AB8500_GPIO_DIR6_REG	0x15
> -
> -#define AB8500_GPIO_OUT1_REG	0x20
> -#define AB8500_GPIO_OUT2_REG	0x21
> -#define AB8500_GPIO_OUT3_REG	0x22
> -#define AB8500_GPIO_OUT4_REG	0x23
> -#define AB8500_GPIO_OUT5_REG	0x24
> -#define AB8500_GPIO_OUT6_REG	0x25
> -
> -#define AB8500_GPIO_PUD1_REG	0x30
> -#define AB8500_GPIO_PUD2_REG	0x31
> -#define AB8500_GPIO_PUD3_REG	0x32
> -#define AB8500_GPIO_PUD4_REG	0x33
> -#define AB8500_GPIO_PUD5_REG	0x34
> -#define AB8500_GPIO_PUD6_REG	0x35
> -
> -#define AB8500_GPIO_IN1_REG	0x40
> -#define AB8500_GPIO_IN2_REG	0x41
> -#define AB8500_GPIO_IN3_REG	0x42
> -#define AB8500_GPIO_IN4_REG	0x43
> -#define AB8500_GPIO_IN5_REG	0x44
> -#define AB8500_GPIO_IN6_REG	0x45
> -#define AB8500_GPIO_ALTFUN_REG	0x45
> -#define ALTFUN_REG_INDEX	6
> -#define AB8500_NUM_GPIO		42
> -#define AB8500_NUM_VIR_GPIO_IRQ	16
> -
> -enum ab8500_gpio_action {
> -	NONE,
> -	STARTUP,
> -	SHUTDOWN,
> -	MASK,
> -	UNMASK
> -};
> -
> -struct ab8500_gpio {
> -	struct gpio_chip chip;
> -	struct ab8500 *parent;
> -	struct device *dev;
> -	struct mutex lock;
> -	u32 irq_base;
> -	enum ab8500_gpio_action irq_action;
> -	u16 rising;
> -	u16 falling;
> -};
> -/**
> - * to_ab8500_gpio() - get the pointer to ab8500_gpio
> - * @chip:	Member of the structure ab8500_gpio
> - */
> -static inline struct ab8500_gpio *to_ab8500_gpio(struct gpio_chip *chip)
> -{
> -	return container_of(chip, struct ab8500_gpio, chip);
> -}
> -
> -static int ab8500_gpio_set_bits(struct gpio_chip *chip, u8 reg,
> -					unsigned offset, int val)
> -{
> -	struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
> -	u8 pos = offset % 8;
> -	int ret;
> -
> -	reg = reg + (offset / 8);
> -	ret = abx500_mask_and_set_register_interruptible(ab8500_gpio->dev,
> -				AB8500_MISC, reg, 1 << pos, val << pos);
> -	if (ret < 0)
> -		dev_err(ab8500_gpio->dev, "%s write failed\n", __func__);
> -	return ret;
> -}
> -/**
> - * ab8500_gpio_get() - Get the particular GPIO value
> - * @chip: Gpio device
> - * @offset: GPIO number to read
> - */
> -static int ab8500_gpio_get(struct gpio_chip *chip, unsigned offset)
> -{
> -	struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
> -	u8 mask = 1 << (offset % 8);
> -	u8 reg = AB8500_GPIO_OUT1_REG + (offset / 8);
> -	int ret;
> -	u8 data;
> -	ret = abx500_get_register_interruptible(ab8500_gpio->dev, AB8500_MISC,
> -						reg, &data);
> -	if (ret < 0) {
> -		dev_err(ab8500_gpio->dev, "%s read failed\n", __func__);
> -		return ret;
> -	}
> -	return (data & mask) >> (offset % 8);
> -}
> -
> -static void ab8500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
> -{
> -	struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
> -	int ret;
> -	/* Write the data */
> -	ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, 1);
> -	if (ret < 0)
> -		dev_err(ab8500_gpio->dev, "%s write failed\n", __func__);
> -}
> -
> -static int ab8500_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
> -					int val)
> -{
> -	int ret;
> -	/* set direction as output */
> -	ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_DIR1_REG, offset, 1);
> -	if (ret < 0)
> -		return ret;
> -	/* disable pull down */
> -	ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_PUD1_REG, offset, 1);
> -	if (ret < 0)
> -		return ret;
> -	/* set the output as 1 or 0 */
> -	return ab8500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, val);
> -
> -}
> -
> -static int ab8500_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
> -{
> -	/* set the register as input */
> -	return ab8500_gpio_set_bits(chip, AB8500_GPIO_DIR1_REG, offset, 0);
> -}
> -
> -static int ab8500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
> -{
> -	/*
> -	 * Only some GPIOs are interrupt capable, and they are
> -	 * organized in discontiguous clusters:
> -	 *
> -	 *	GPIO6 to GPIO13
> -	 *	GPIO24 and GPIO25
> -	 *	GPIO36 to GPIO41
> -	 */
> -	static struct ab8500_gpio_irq_cluster {
> -		int start;
> -		int end;
> -	} clusters[] = {
> -		{.start = 6,  .end = 13},
> -		{.start = 24, .end = 25},
> -		{.start = 36, .end = 41},
> -	};
> -	struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
> -	int base = ab8500_gpio->irq_base;
> -	int i;
> -
> -	for (i = 0; i < ARRAY_SIZE(clusters); i++) {
> -		struct ab8500_gpio_irq_cluster *cluster = &clusters[i];
> -
> -		if (offset >= cluster->start && offset <= cluster->end)
> -			return base + offset - cluster->start;
> -
> -		/* Advance by the number of gpios in this cluster */
> -		base += cluster->end - cluster->start + 1;
> -	}
> -
> -	return -EINVAL;
> -}
> -
> -static struct gpio_chip ab8500gpio_chip = {
> -	.label			= "ab8500_gpio",
> -	.owner			= THIS_MODULE,
> -	.direction_input	= ab8500_gpio_direction_input,
> -	.get			= ab8500_gpio_get,
> -	.direction_output	= ab8500_gpio_direction_output,
> -	.set			= ab8500_gpio_set,
> -	.to_irq			= ab8500_gpio_to_irq,
> -};
> -
> -static unsigned int irq_to_rising(unsigned int irq)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	int offset = irq - ab8500_gpio->irq_base;
> -	int new_irq = offset +  AB8500_INT_GPIO6R
> -			+ ab8500_gpio->parent->irq_base;
> -	return new_irq;
> -}
> -
> -static unsigned int irq_to_falling(unsigned int irq)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	int offset = irq - ab8500_gpio->irq_base;
> -	int new_irq = offset +  AB8500_INT_GPIO6F
> -			+  ab8500_gpio->parent->irq_base;
> -	return new_irq;
> -
> -}
> -
> -static unsigned int rising_to_irq(unsigned int irq, void *dev)
> -{
> -	struct ab8500_gpio *ab8500_gpio = dev;
> -	int offset = irq - AB8500_INT_GPIO6R
> -			- ab8500_gpio->parent->irq_base ;
> -	int new_irq = offset + ab8500_gpio->irq_base;
> -	return new_irq;
> -}
> -
> -static unsigned int falling_to_irq(unsigned int irq, void *dev)
> -{
> -	struct ab8500_gpio *ab8500_gpio = dev;
> -	int offset = irq - AB8500_INT_GPIO6F
> -			- ab8500_gpio->parent->irq_base ;
> -	int new_irq = offset + ab8500_gpio->irq_base;
> -	return new_irq;
> -
> -}
> -
> -/*
> - * IRQ handler
> - */
> -
> -static irqreturn_t handle_rising(int irq, void *dev)
> -{
> -
> -	handle_nested_irq(rising_to_irq(irq , dev));
> -	return IRQ_HANDLED;
> -}
> -
> -static irqreturn_t handle_falling(int irq, void *dev)
> -{
> -
> -	handle_nested_irq(falling_to_irq(irq, dev));
> -	return IRQ_HANDLED;
> -}
> -
> -static void ab8500_gpio_irq_lock(unsigned int irq)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	mutex_lock(&ab8500_gpio->lock);
> -}
> -
> -static void ab8500_gpio_irq_sync_unlock(unsigned int irq)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	int offset = irq - ab8500_gpio->irq_base;
> -	bool rising = ab8500_gpio->rising & BIT(offset);
> -	bool falling = ab8500_gpio->falling & BIT(offset);
> -	int ret;
> -
> -	switch (ab8500_gpio->irq_action)	{
> -	case STARTUP:
> -		if (rising)
> -			ret = request_threaded_irq(irq_to_rising(irq),
> -					NULL, handle_rising,
> -					IRQF_TRIGGER_RISING,
> -					"ab8500-gpio-r", ab8500_gpio);
> -		if (falling)
> -			ret = request_threaded_irq(irq_to_falling(irq),
> -				       NULL, handle_falling,
> -				       IRQF_TRIGGER_FALLING,
> -				       "ab8500-gpio-f", ab8500_gpio);
> -		break;
> -	case SHUTDOWN:
> -		if (rising)
> -			free_irq(irq_to_rising(irq), ab8500_gpio);
> -		if (falling)
> -			free_irq(irq_to_falling(irq), ab8500_gpio);
> -		break;
> -	case MASK:
> -		if (rising)
> -			disable_irq(irq_to_rising(irq));
> -		if (falling)
> -			disable_irq(irq_to_falling(irq));
> -		break;
> -	case UNMASK:
> -		if (rising)
> -			enable_irq(irq_to_rising(irq));
> -		if (falling)
> -			enable_irq(irq_to_falling(irq));
> -		break;
> -	case NONE:
> -		break;
> -	}
> -	ab8500_gpio->irq_action = NONE;
> -	ab8500_gpio->rising &= ~(BIT(offset));
> -	ab8500_gpio->falling &= ~(BIT(offset));
> -	mutex_unlock(&ab8500_gpio->lock);
> -}
> -
> -
> -static void ab8500_gpio_irq_mask(unsigned int irq)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	ab8500_gpio->irq_action = MASK;
> -}
> -
> -static void ab8500_gpio_irq_unmask(unsigned int irq)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	ab8500_gpio->irq_action = UNMASK;
> -}
> -
> -static int ab8500_gpio_irq_set_type(unsigned int irq, unsigned int type)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	int offset = irq - ab8500_gpio->irq_base;
> -
> -	if (type == IRQ_TYPE_EDGE_BOTH) {
> -		ab8500_gpio->rising =  BIT(offset);
> -		ab8500_gpio->falling = BIT(offset);
> -	} else if (type == IRQ_TYPE_EDGE_RISING) {
> -		ab8500_gpio->rising =  BIT(offset);
> -	} else  {
> -		ab8500_gpio->falling = BIT(offset);
> -	}
> -	return 0;
> -}
> -
> -unsigned int ab8500_gpio_irq_startup(unsigned int irq)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	ab8500_gpio->irq_action = STARTUP;
> -	return 0;
> -}
> -
> -void ab8500_gpio_irq_shutdown(unsigned int irq)
> -{
> -	struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
> -	ab8500_gpio->irq_action = SHUTDOWN;
> -}
> -
> -static struct irq_chip ab8500_gpio_irq_chip = {
> -	.name			= "ab8500-gpio",
> -	.startup		= ab8500_gpio_irq_startup,
> -	.shutdown		= ab8500_gpio_irq_shutdown,
> -	.bus_lock		= ab8500_gpio_irq_lock,
> -	.bus_sync_unlock	= ab8500_gpio_irq_sync_unlock,
> -	.mask			= ab8500_gpio_irq_mask,
> -	.unmask			= ab8500_gpio_irq_unmask,
> -	.set_type		= ab8500_gpio_irq_set_type,
> -};
> -
> -static int ab8500_gpio_irq_init(struct ab8500_gpio *ab8500_gpio)
> -{
> -	u32 base = ab8500_gpio->irq_base;
> -	int irq;
> -
> -	for (irq = base; irq < base + AB8500_NUM_VIR_GPIO_IRQ ; irq++) {
> -		set_irq_chip_data(irq, ab8500_gpio);
> -		set_irq_chip_and_handler(irq, &ab8500_gpio_irq_chip,
> -				handle_simple_irq);
> -		set_irq_nested_thread(irq, 1);
> -#ifdef CONFIG_ARM
> -		set_irq_flags(irq, IRQF_VALID);
> -#else
> -		set_irq_noprobe(irq);
> -#endif
> -	}
> -
> -	return 0;
> -}
> -
> -static void ab8500_gpio_irq_remove(struct ab8500_gpio *ab8500_gpio)
> -{
> -	int base = ab8500_gpio->irq_base;
> -	int irq;
> -
> -	for (irq = base; irq < base + AB8500_NUM_VIR_GPIO_IRQ; irq++) {
> -#ifdef CONFIG_ARM
> -		set_irq_flags(irq, 0);
> -#endif
> -		set_irq_chip_and_handler(irq, NULL, NULL);
> -		set_irq_chip_data(irq, NULL);
> -	}
> -}
> -
> -static int ab8500_gpio_probe(struct platform_device *pdev)
> -{
> -	struct ab8500_platform_data *ab8500_pdata =
> -				dev_get_platdata(pdev->dev.parent);
> -	struct ab8500_gpio_platform_data *pdata;
> -	struct ab8500_gpio *ab8500_gpio;
> -	int ret;
> -	int i;
> -
> -	pdata = ab8500_pdata->gpio;
> -	if (!pdata)	{
> -		dev_err(&pdev->dev, "gpio platform data missing\n");
> -		return -ENODEV;
> -	}
> -
> -	ab8500_gpio = kzalloc(sizeof(struct ab8500_gpio), GFP_KERNEL);
> -	if (ab8500_gpio == NULL) {
> -		dev_err(&pdev->dev, "failed to allocate memory\n");
> -		return -ENOMEM;
> -	}
> -	ab8500_gpio->dev = &pdev->dev;
> -	ab8500_gpio->parent = dev_get_drvdata(pdev->dev.parent);
> -	ab8500_gpio->chip = ab8500gpio_chip;
> -	ab8500_gpio->chip.ngpio = AB8500_NUM_GPIO;
> -	ab8500_gpio->chip.dev = &pdev->dev;
> -	ab8500_gpio->chip.base = pdata->gpio_base;
> -	ab8500_gpio->irq_base = pdata->irq_base;
> -	/* initialize the lock */
> -	mutex_init(&ab8500_gpio->lock);
> -	/*
> -	 * AB8500 core will handle and clear the IRQ
> -	 * configre GPIO based on config-reg value.
> -	 * These values are for selecting the PINs as
> -	 * GPIO or alternate function
> -	 */
> -	for (i = AB8500_GPIO_SEL1_REG; i <= AB8500_GPIO_SEL6_REG; i++)	{
> -		ret = abx500_set_register_interruptible(ab8500_gpio->dev,
> -				AB8500_MISC, i,
> -				pdata->config_reg[i]);
> -		if (ret < 0)
> -			goto out_free;
> -	}
> -	ret = abx500_set_register_interruptible(ab8500_gpio->dev, AB8500_MISC,
> -				AB8500_GPIO_ALTFUN_REG,
> -				pdata->config_reg[ALTFUN_REG_INDEX]);
> -	if (ret < 0)
> -		goto out_free;
> -
> -	ret = ab8500_gpio_irq_init(ab8500_gpio);
> -	if (ret)
> -		goto out_free;
> -	ret = gpiochip_add(&ab8500_gpio->chip);
> -	if (ret) {
> -		dev_err(&pdev->dev, "unable to add gpiochip: %d\n",
> -				ret);
> -		goto out_rem_irq;
> -	}
> -	platform_set_drvdata(pdev, ab8500_gpio);
> -	return 0;
> -
> -out_rem_irq:
> -	ab8500_gpio_irq_remove(ab8500_gpio);
> -out_free:
> -	mutex_destroy(&ab8500_gpio->lock);
> -	kfree(ab8500_gpio);
> -	return ret;
> -}
> -
> -/*
> - * ab8500_gpio_remove() - remove Ab8500-gpio driver
> - * @pdev :	Platform device registered
> - */
> -static int ab8500_gpio_remove(struct platform_device *pdev)
> -{
> -	struct ab8500_gpio *ab8500_gpio = platform_get_drvdata(pdev);
> -	int ret;
> -
> -	ret = gpiochip_remove(&ab8500_gpio->chip);
> -	if (ret < 0) {
> -		dev_err(ab8500_gpio->dev, "unable to remove gpiochip: %d\n",
> -			ret);
> -		return ret;
> -	}
> -
> -	platform_set_drvdata(pdev, NULL);
> -	mutex_destroy(&ab8500_gpio->lock);
> -	kfree(ab8500_gpio);
> -
> -	return 0;
> -}
> -
> -static struct platform_driver ab8500_gpio_driver = {
> -	.driver = {
> -		.name = "ab8500-gpio",
> -		.owner = THIS_MODULE,
> -	},
> -	.probe = ab8500_gpio_probe,
> -	.remove = ab8500_gpio_remove,
> -};
> -
> -static int __init ab8500_gpio_init(void)
> -{
> -	return platform_driver_register(&ab8500_gpio_driver);
> -}
> -arch_initcall(ab8500_gpio_init);
> -
> -static void __exit ab8500_gpio_exit(void)
> -{
> -	platform_driver_unregister(&ab8500_gpio_driver);
> -}
> -module_exit(ab8500_gpio_exit);
> -
> -MODULE_AUTHOR("BIBEK BASU <bibek.basu@...ricsson.com>");
> -MODULE_DESCRIPTION("Driver allows to use AB8500 unused pins to be used as GPIO");
> -MODULE_ALIAS("platform:ab8500-gpio");
> -MODULE_LICENSE("GPL v2");
> -- 
> 1.7.11.3
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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