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    Subject[PATCH v7 4/6] gpio: Add GPIO Aggregator
    Date
    GPIO controllers are exported to userspace using /dev/gpiochip*
    character devices. Access control to these devices is provided by
    standard UNIX file system permissions, on an all-or-nothing basis:
    either a GPIO controller is accessible for a user, or it is not.
    Currently no mechanism exists to control access to individual GPIOs.

    Hence add a GPIO driver to aggregate existing GPIOs, and expose them as
    a new gpiochip.

    This supports the following use cases:
    - Aggregating GPIOs using Sysfs
    This is useful for implementing access control, and assigning a set
    of GPIOs to a specific user or virtual machine.
    - Generic GPIO Driver
    This is useful for industrial control, where it can provide
    userspace access to a simple GPIO-operated device described in DT,
    cfr. e.g. spidev for SPI-operated devices.

    Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
    Reviewed-by: Eugeniu Rosca <erosca@de.adit-jv.com>
    Tested-by: Eugeniu Rosca <erosca@de.adit-jv.com>
    ---
    v7:
    - No changes,

    v6:
    - Use gpiod_to_chip() instead of open-coding,
    - Drop debug print of gpio_desc.label, as it usually just points to
    the GPIO Aggregator itself,
    - Drop no longer needed #include "gpiolib.h",
    - Fix missing offset translation in gpio_fwd_set_config(),
    - Use GPIO_LOOKUP_IDX() to populate struct gpiod_lookup,

    v5:
    - Add Reviewed-by, Tested-by,

    v4:
    - Remove unused assignment to n in isrange(),
    - Check correct pointer after aggr->lookups->dev_id allocation,
    - Preinitialize flags to 0 in gpio_fwd_[gs]et_multiple() to avoid
    may-be-used-uninitialized warning,
    - Drop controversial GPIO repeater,
    - Update for gpiod_lookup.chip_label rename,
    - Use %pe to format error pointers,
    - Use U16_MAX instead of (u16)-1,
    - Correct comment indentation,
    - Use skip_spaces() helper,
    - Rename a and b to first_index resp. last_index,
    - Add comment to tmp[] use,
    - Improve Kconfig help text,
    - Include <linux/gpio/consumer.h> for gpiod_[gs]et_*(),
    - Drop unneeded valid_mask handling,
    - Add comment about sleeping and .set_config() support,

    v3:
    - Absorb GPIO forwarder,
    - Integrate GPIO Repeater and Generic GPIO driver functionality,
    - Use the aggregator parameters to create a GPIO lookup table instead
    of an array of GPIO descriptors, which allows to simplify the code:
    1. This removes the need for calling gpio_name_to_desc(),
    gpiochip_find(), gpiochip_get_desc(), and gpiod_request(),
    2. This allows the platform device to always use
    devm_gpiod_get_index(), regardless of the origin of the GPIOs,
    - Move parameter parsing from platform device probe to sysfs attribute
    store, removing the need for platform data passing,
    - Use more devm_*() functions to simplify cleanup,
    - Add pr_fmt(),
    - General refactoring,

    v2:
    - Add missing initialization of i in gpio_virt_agg_probe(),
    - Update for removed .need_valid_mask field and changed
    .init_valid_mask() signature,
    - Drop "virtual", rename to gpio-aggregator,
    - Drop bogus FIXME related to gpiod_set_transitory() expectations,
    - Use new GPIO Forwarder Helper,
    - Lift limit on the maximum number of GPIOs,
    - Improve parsing:
    - add support for specifying GPIOs by line name,
    - add support for specifying GPIO chips by ID,
    - add support for GPIO offset ranges,
    - names and offset specifiers must be separated by whitespace,
    - GPIO offsets must separated by spaces,
    - Use str_has_prefix() and kstrtouint().
    ---
    drivers/gpio/Kconfig | 12 +
    drivers/gpio/Makefile | 1 +
    drivers/gpio/gpio-aggregator.c | 568 +++++++++++++++++++++++++++++++++
    3 files changed, 581 insertions(+)
    create mode 100644 drivers/gpio/gpio-aggregator.c

    diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
    index 8ef2179fb9991b78..c92e0a16c352f3d1 100644
    --- a/drivers/gpio/Kconfig
    +++ b/drivers/gpio/Kconfig
    @@ -1541,6 +1541,18 @@ config GPIO_VIPERBOARD

    endmenu

    +config GPIO_AGGREGATOR
    + tristate "GPIO Aggregator"
    + help
    + Say yes here to enable the GPIO Aggregator, which provides a way to
    + aggregate existing GPIO lines into a new virtual GPIO chip.
    + This can serve the following purposes:
    + - Assign permissions for a collection of GPIO lines to a user,
    + - Export a collection of GPIO lines to a virtual machine,
    + - Provide a generic driver for a GPIO-operated device in an
    + industrial control context, to be operated from userspace using
    + the GPIO chardev interface.
    +
    config GPIO_MOCKUP
    tristate "GPIO Testing Driver"
    select IRQ_SIM
    diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
    index b2cfc21a97f3e52b..65bf3940e33cf734 100644
    --- a/drivers/gpio/Makefile
    +++ b/drivers/gpio/Makefile
    @@ -25,6 +25,7 @@ obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o
    obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o
    obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
    obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
    +obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o
    obj-$(CONFIG_GPIO_ALTERA_A10SR) += gpio-altera-a10sr.o
    obj-$(CONFIG_GPIO_ALTERA) += gpio-altera.o
    obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
    diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
    new file mode 100644
    index 0000000000000000..9b0adbdddbfccb30
    --- /dev/null
    +++ b/drivers/gpio/gpio-aggregator.c
    @@ -0,0 +1,568 @@
    +// SPDX-License-Identifier: GPL-2.0-only
    +//
    +// GPIO Aggregator
    +//
    +// Copyright (C) 2019-2020 Glider bv
    +
    +#define DRV_NAME "gpio-aggregator"
    +#define pr_fmt(fmt) DRV_NAME ": " fmt
    +
    +#include <linux/bitmap.h>
    +#include <linux/bitops.h>
    +#include <linux/ctype.h>
    +#include <linux/gpio/consumer.h>
    +#include <linux/gpio/driver.h>
    +#include <linux/gpio/machine.h>
    +#include <linux/idr.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/mutex.h>
    +#include <linux/overflow.h>
    +#include <linux/platform_device.h>
    +#include <linux/spinlock.h>
    +#include <linux/string.h>
    +
    +
    +/*
    + * GPIO Aggregator sysfs interface
    + */
    +
    +struct gpio_aggregator {
    + struct gpiod_lookup_table *lookups;
    + struct platform_device *pdev;
    + char args[];
    +};
    +
    +static DEFINE_MUTEX(gpio_aggregator_lock); /* protects idr */
    +static DEFINE_IDR(gpio_aggregator_idr);
    +
    +static char *get_arg(char **args)
    +{
    + char *start = *args, *end;
    +
    + start = skip_spaces(start);
    + if (!*start)
    + return NULL;
    +
    + if (*start == '"') {
    + /* Quoted arg */
    + end = strchr(++start, '"');
    + if (!end)
    + return ERR_PTR(-EINVAL);
    + } else {
    + /* Unquoted arg */
    + for (end = start; *end && !isspace(*end); end++) ;
    + }
    +
    + if (*end)
    + *end++ = '\0';
    +
    + *args = end;
    + return start;
    +}
    +
    +static bool isrange(const char *s)
    +{
    + size_t n;
    +
    + if (IS_ERR_OR_NULL(s))
    + return false;
    +
    + while (1) {
    + n = strspn(s, "0123456789");
    + if (!n)
    + return false;
    +
    + s += n;
    +
    + switch (*s++) {
    + case '\0':
    + return true;
    +
    + case '-':
    + case ',':
    + break;
    +
    + default:
    + return false;
    + }
    + }
    +}
    +
    +static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key,
    + int hwnum, unsigned int *n)
    +{
    + struct gpiod_lookup_table *lookups;
    +
    + lookups = krealloc(aggr->lookups, struct_size(lookups, table, *n + 2),
    + GFP_KERNEL);
    + if (!lookups)
    + return -ENOMEM;
    +
    + lookups->table[*n] =
    + (struct gpiod_lookup)GPIO_LOOKUP_IDX(key, hwnum, NULL, *n, 0);
    +
    + (*n)++;
    + memset(&lookups->table[*n], 0, sizeof(lookups->table[*n]));
    +
    + aggr->lookups = lookups;
    + return 0;
    +}
    +
    +static int aggr_parse(struct gpio_aggregator *aggr)
    +{
    + unsigned int first_index, last_index, i, n = 0;
    + char *name, *offsets, *first, *last, *next;
    + char *args = aggr->args;
    + int error;
    +
    + for (name = get_arg(&args), offsets = get_arg(&args); name;
    + offsets = get_arg(&args)) {
    + if (IS_ERR(name)) {
    + pr_err("Cannot get GPIO specifier: %pe\n", name);
    + return PTR_ERR(name);
    + }
    +
    + if (!isrange(offsets)) {
    + /* Named GPIO line */
    + error = aggr_add_gpio(aggr, name, U16_MAX, &n);
    + if (error)
    + return error;
    +
    + name = offsets;
    + continue;
    + }
    +
    + /* GPIO chip + offset(s) */
    + for (first = offsets; *first; first = next) {
    + next = strchrnul(first, ',');
    + if (*next)
    + *next++ = '\0';
    +
    + last = strchr(first, '-');
    + if (last)
    + *last++ = '\0';
    +
    + if (kstrtouint(first, 10, &first_index)) {
    + pr_err("Cannot parse GPIO index %s\n", first);
    + return -EINVAL;
    + }
    +
    + if (!last) {
    + last_index = first_index;
    + } else if (kstrtouint(last, 10, &last_index)) {
    + pr_err("Cannot parse GPIO index %s\n", last);
    + return -EINVAL;
    + }
    +
    + for (i = first_index; i <= last_index; i++) {
    + error = aggr_add_gpio(aggr, name, i, &n);
    + if (error)
    + return error;
    + }
    + }
    +
    + name = get_arg(&args);
    + }
    +
    + if (!n) {
    + pr_err("No GPIOs specified\n");
    + return -EINVAL;
    + }
    +
    + return 0;
    +}
    +
    +static ssize_t new_device_store(struct device_driver *driver, const char *buf,
    + size_t count)
    +{
    + struct gpio_aggregator *aggr;
    + struct platform_device *pdev;
    + int res, id;
    +
    + /* kernfs guarantees string termination, so count + 1 is safe */
    + aggr = kzalloc(sizeof(*aggr) + count + 1, GFP_KERNEL);
    + if (!aggr)
    + return -ENOMEM;
    +
    + memcpy(aggr->args, buf, count + 1);
    +
    + aggr->lookups = kzalloc(struct_size(aggr->lookups, table, 1),
    + GFP_KERNEL);
    + if (!aggr->lookups) {
    + res = -ENOMEM;
    + goto free_ga;
    + }
    +
    + mutex_lock(&gpio_aggregator_lock);
    + id = idr_alloc(&gpio_aggregator_idr, aggr, 0, 0, GFP_KERNEL);
    + mutex_unlock(&gpio_aggregator_lock);
    +
    + if (id < 0) {
    + res = id;
    + goto free_table;
    + }
    +
    + aggr->lookups->dev_id = kasprintf(GFP_KERNEL, "%s.%d", DRV_NAME, id);
    + if (!aggr->lookups->dev_id) {
    + res = -ENOMEM;
    + goto remove_idr;
    + }
    +
    + res = aggr_parse(aggr);
    + if (res)
    + goto free_dev_id;
    +
    + gpiod_add_lookup_table(aggr->lookups);
    +
    + pdev = platform_device_register_simple(DRV_NAME, id, NULL, 0);
    + if (IS_ERR(pdev)) {
    + res = PTR_ERR(pdev);
    + goto remove_table;
    + }
    +
    + aggr->pdev = pdev;
    + return count;
    +
    +remove_table:
    + gpiod_remove_lookup_table(aggr->lookups);
    +free_dev_id:
    + kfree(aggr->lookups->dev_id);
    +remove_idr:
    + mutex_lock(&gpio_aggregator_lock);
    + idr_remove(&gpio_aggregator_idr, id);
    + mutex_unlock(&gpio_aggregator_lock);
    +free_table:
    + kfree(aggr->lookups);
    +free_ga:
    + kfree(aggr);
    + return res;
    +}
    +
    +static DRIVER_ATTR_WO(new_device);
    +
    +static void gpio_aggregator_free(struct gpio_aggregator *aggr)
    +{
    + platform_device_unregister(aggr->pdev);
    + gpiod_remove_lookup_table(aggr->lookups);
    + kfree(aggr->lookups->dev_id);
    + kfree(aggr->lookups);
    + kfree(aggr);
    +}
    +
    +static ssize_t delete_device_store(struct device_driver *driver,
    + const char *buf, size_t count)
    +{
    + struct gpio_aggregator *aggr;
    + unsigned int id;
    + int error;
    +
    + if (!str_has_prefix(buf, DRV_NAME "."))
    + return -EINVAL;
    +
    + error = kstrtouint(buf + strlen(DRV_NAME "."), 10, &id);
    + if (error)
    + return error;
    +
    + mutex_lock(&gpio_aggregator_lock);
    + aggr = idr_remove(&gpio_aggregator_idr, id);
    + mutex_unlock(&gpio_aggregator_lock);
    + if (!aggr)
    + return -ENOENT;
    +
    + gpio_aggregator_free(aggr);
    + return count;
    +}
    +static DRIVER_ATTR_WO(delete_device);
    +
    +static struct attribute *gpio_aggregator_attrs[] = {
    + &driver_attr_new_device.attr,
    + &driver_attr_delete_device.attr,
    + NULL,
    +};
    +ATTRIBUTE_GROUPS(gpio_aggregator);
    +
    +static int __exit gpio_aggregator_idr_remove(int id, void *p, void *data)
    +{
    + gpio_aggregator_free(p);
    + return 0;
    +}
    +
    +static void __exit gpio_aggregator_remove_all(void)
    +{
    + mutex_lock(&gpio_aggregator_lock);
    + idr_for_each(&gpio_aggregator_idr, gpio_aggregator_idr_remove, NULL);
    + idr_destroy(&gpio_aggregator_idr);
    + mutex_unlock(&gpio_aggregator_lock);
    +}
    +
    +
    +/*
    + * GPIO Forwarder
    + */
    +
    +struct gpiochip_fwd {
    + struct gpio_chip chip;
    + struct gpio_desc **descs;
    + union {
    + struct mutex mlock; /* protects tmp[] if can_sleep */
    + spinlock_t slock; /* protects tmp[] if !can_sleep */
    + };
    + unsigned long tmp[]; /* values and descs for multiple ops */
    +};
    +
    +static int gpio_fwd_get_direction(struct gpio_chip *chip, unsigned int offset)
    +{
    + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
    +
    + return gpiod_get_direction(fwd->descs[offset]);
    +}
    +
    +static int gpio_fwd_direction_input(struct gpio_chip *chip, unsigned int offset)
    +{
    + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
    +
    + return gpiod_direction_input(fwd->descs[offset]);
    +}
    +
    +static int gpio_fwd_direction_output(struct gpio_chip *chip,
    + unsigned int offset, int value)
    +{
    + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
    +
    + return gpiod_direction_output(fwd->descs[offset], value);
    +}
    +
    +static int gpio_fwd_get(struct gpio_chip *chip, unsigned int offset)
    +{
    + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
    +
    + return gpiod_get_value(fwd->descs[offset]);
    +}
    +
    +static int gpio_fwd_get_multiple(struct gpio_chip *chip, unsigned long *mask,
    + unsigned long *bits)
    +{
    + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
    + unsigned long *values, flags = 0;
    + struct gpio_desc **descs;
    + unsigned int i, j = 0;
    + int error;
    +
    + if (chip->can_sleep)
    + mutex_lock(&fwd->mlock);
    + else
    + spin_lock_irqsave(&fwd->slock, flags);
    +
    + /* Both values bitmap and desc pointers are stored in tmp[] */
    + values = &fwd->tmp[0];
    + descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)];
    +
    + bitmap_clear(values, 0, fwd->chip.ngpio);
    + for_each_set_bit(i, mask, fwd->chip.ngpio)
    + descs[j++] = fwd->descs[i];
    +
    + error = gpiod_get_array_value(j, descs, NULL, values);
    + if (!error) {
    + j = 0;
    + for_each_set_bit(i, mask, fwd->chip.ngpio)
    + __assign_bit(i, bits, test_bit(j++, values));
    + }
    +
    + if (chip->can_sleep)
    + mutex_unlock(&fwd->mlock);
    + else
    + spin_unlock_irqrestore(&fwd->slock, flags);
    +
    + return error;
    +}
    +
    +static void gpio_fwd_set(struct gpio_chip *chip, unsigned int offset, int value)
    +{
    + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
    +
    + gpiod_set_value(fwd->descs[offset], value);
    +}
    +
    +static void gpio_fwd_set_multiple(struct gpio_chip *chip, unsigned long *mask,
    + unsigned long *bits)
    +{
    + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
    + unsigned long *values, flags = 0;
    + struct gpio_desc **descs;
    + unsigned int i, j = 0;
    +
    + if (chip->can_sleep)
    + mutex_lock(&fwd->mlock);
    + else
    + spin_lock_irqsave(&fwd->slock, flags);
    +
    + /* Both values bitmap and desc pointers are stored in tmp[] */
    + values = &fwd->tmp[0];
    + descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)];
    +
    + for_each_set_bit(i, mask, fwd->chip.ngpio) {
    + __assign_bit(j, values, test_bit(i, bits));
    + descs[j++] = fwd->descs[i];
    + }
    +
    + gpiod_set_array_value(j, descs, NULL, values);
    +
    + if (chip->can_sleep)
    + mutex_unlock(&fwd->mlock);
    + else
    + spin_unlock_irqrestore(&fwd->slock, flags);
    +}
    +
    +static int gpio_fwd_set_config(struct gpio_chip *chip, unsigned int offset,
    + unsigned long config)
    +{
    + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
    +
    + return gpiod_set_config(fwd->descs[offset], config);
    +}
    +
    +/**
    + * gpiochip_fwd_create() - Create a new GPIO forwarder
    + * @dev: Parent device pointer
    + * @ngpios: Number of GPIOs in the forwarder.
    + * @descs: Array containing the GPIO descriptors to forward to.
    + * This array must contain @ngpios entries, and must not be deallocated
    + * before the forwarder has been destroyed again.
    + *
    + * This function creates a new gpiochip, which forwards all GPIO operations to
    + * the passed GPIO descriptors.
    + *
    + * Return: An opaque object pointer, or an ERR_PTR()-encoded negative error
    + * code on failure.
    + */
    +static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
    + unsigned int ngpios,
    + struct gpio_desc *descs[])
    +{
    + const char *label = dev_name(dev);
    + struct gpiochip_fwd *fwd;
    + struct gpio_chip *chip;
    + unsigned int i;
    + int error;
    +
    + fwd = devm_kzalloc(dev, struct_size(fwd, tmp,
    + BITS_TO_LONGS(ngpios) + ngpios), GFP_KERNEL);
    + if (!fwd)
    + return ERR_PTR(-ENOMEM);
    +
    + chip = &fwd->chip;
    +
    + /*
    + * If any of the GPIO lines are sleeping, then the entire forwarder
    + * will be sleeping.
    + * If any of the chips support .set_config(), then the forwarder will
    + * support setting configs.
    + */
    + for (i = 0; i < ngpios; i++) {
    + struct gpio_chip *parent = gpiod_to_chip(descs[i]);
    +
    + dev_dbg(dev, "%u => gpio-%d\n", i, desc_to_gpio(descs[i]));
    +
    + if (gpiod_cansleep(descs[i]))
    + chip->can_sleep = true;
    + if (parent && parent->set_config)
    + chip->set_config = gpio_fwd_set_config;
    + }
    +
    + chip->label = label;
    + chip->parent = dev;
    + chip->owner = THIS_MODULE;
    + chip->get_direction = gpio_fwd_get_direction;
    + chip->direction_input = gpio_fwd_direction_input;
    + chip->direction_output = gpio_fwd_direction_output;
    + chip->get = gpio_fwd_get;
    + chip->get_multiple = gpio_fwd_get_multiple;
    + chip->set = gpio_fwd_set;
    + chip->set_multiple = gpio_fwd_set_multiple;
    + chip->base = -1;
    + chip->ngpio = ngpios;
    + fwd->descs = descs;
    +
    + if (chip->can_sleep)
    + mutex_init(&fwd->mlock);
    + else
    + spin_lock_init(&fwd->slock);
    +
    + error = devm_gpiochip_add_data(dev, chip, fwd);
    + if (error)
    + return ERR_PTR(error);
    +
    + return fwd;
    +}
    +
    +
    +/*
    + * GPIO Aggregator platform device
    + */
    +
    +static int gpio_aggregator_probe(struct platform_device *pdev)
    +{
    + struct device *dev = &pdev->dev;
    + struct gpio_desc **descs;
    + struct gpiochip_fwd *fwd;
    + int i, n;
    +
    + n = gpiod_count(dev, NULL);
    + if (n < 0)
    + return n;
    +
    + descs = devm_kmalloc_array(dev, n, sizeof(*descs), GFP_KERNEL);
    + if (!descs)
    + return -ENOMEM;
    +
    + for (i = 0; i < n; i++) {
    + descs[i] = devm_gpiod_get_index(dev, NULL, i, GPIOD_ASIS);
    + if (IS_ERR(descs[i]))
    + return PTR_ERR(descs[i]);
    + }
    +
    + fwd = gpiochip_fwd_create(dev, n, descs);
    + if (IS_ERR(fwd))
    + return PTR_ERR(fwd);
    +
    + platform_set_drvdata(pdev, fwd);
    + return 0;
    +}
    +
    +#ifdef CONFIG_OF
    +static const struct of_device_id gpio_aggregator_dt_ids[] = {
    + /*
    + * Add GPIO-operated devices controlled from userspace below,
    + * or use "driver_override" in sysfs
    + */
    + {},
    +};
    +MODULE_DEVICE_TABLE(of, gpio_aggregator_dt_ids);
    +#endif
    +
    +static struct platform_driver gpio_aggregator_driver = {
    + .probe = gpio_aggregator_probe,
    + .driver = {
    + .name = DRV_NAME,
    + .groups = gpio_aggregator_groups,
    + .of_match_table = of_match_ptr(gpio_aggregator_dt_ids),
    + },
    +};
    +
    +static int __init gpio_aggregator_init(void)
    +{
    + return platform_driver_register(&gpio_aggregator_driver);
    +}
    +module_init(gpio_aggregator_init);
    +
    +static void __exit gpio_aggregator_exit(void)
    +{
    + gpio_aggregator_remove_all();
    + platform_driver_unregister(&gpio_aggregator_driver);
    +}
    +module_exit(gpio_aggregator_exit);
    +
    +MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
    +MODULE_DESCRIPTION("GPIO Aggregator");
    +MODULE_LICENSE("GPL v2");
    --
    2.17.1
    \
     
     \ /
      Last update: 2020-05-11 16:53    [W:4.373 / U:0.400 seconds]
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