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gpio: Add GPIO Aggregator
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>
Tested-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Link: https://lore.kernel.org/r/20200511145257.22970-5-geert+renesas@glider.be
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Geert Uytterhoeven
Linus Walleij
parent
4c033b5499
commit
828546e242
@ -1541,6 +1541,18 @@ config GPIO_VIPERBOARD
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endmenu
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config GPIO_AGGREGATOR
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tristate "GPIO Aggregator"
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help
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Say yes here to enable the GPIO Aggregator, which provides a way to
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aggregate existing GPIO lines into a new virtual GPIO chip.
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This can serve the following purposes:
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- Assign permissions for a collection of GPIO lines to a user,
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- Export a collection of GPIO lines to a virtual machine,
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- Provide a generic driver for a GPIO-operated device in an
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industrial control context, to be operated from userspace using
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the GPIO chardev interface.
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config GPIO_MOCKUP
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tristate "GPIO Testing Driver"
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select IRQ_SIM
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@ -25,6 +25,7 @@ obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o
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obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o
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obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
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obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
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obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o
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obj-$(CONFIG_GPIO_ALTERA_A10SR) += gpio-altera-a10sr.o
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obj-$(CONFIG_GPIO_ALTERA) += gpio-altera.o
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obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
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568
drivers/gpio/gpio-aggregator.c
Normal file
568
drivers/gpio/gpio-aggregator.c
Normal file
@ -0,0 +1,568 @@
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// SPDX-License-Identifier: GPL-2.0-only
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//
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// GPIO Aggregator
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//
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// Copyright (C) 2019-2020 Glider bv
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#define DRV_NAME "gpio-aggregator"
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#define pr_fmt(fmt) DRV_NAME ": " fmt
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#include <linux/bitmap.h>
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#include <linux/bitops.h>
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#include <linux/ctype.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/driver.h>
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#include <linux/gpio/machine.h>
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#include <linux/idr.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/overflow.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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/*
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* GPIO Aggregator sysfs interface
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*/
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struct gpio_aggregator {
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struct gpiod_lookup_table *lookups;
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struct platform_device *pdev;
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char args[];
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};
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static DEFINE_MUTEX(gpio_aggregator_lock); /* protects idr */
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static DEFINE_IDR(gpio_aggregator_idr);
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static char *get_arg(char **args)
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{
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char *start = *args, *end;
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start = skip_spaces(start);
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if (!*start)
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return NULL;
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if (*start == '"') {
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/* Quoted arg */
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end = strchr(++start, '"');
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if (!end)
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return ERR_PTR(-EINVAL);
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} else {
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/* Unquoted arg */
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for (end = start; *end && !isspace(*end); end++) ;
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}
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if (*end)
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*end++ = '\0';
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*args = end;
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return start;
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}
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static bool isrange(const char *s)
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{
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size_t n;
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if (IS_ERR_OR_NULL(s))
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return false;
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while (1) {
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n = strspn(s, "0123456789");
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if (!n)
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return false;
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s += n;
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switch (*s++) {
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case '\0':
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return true;
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case '-':
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case ',':
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break;
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default:
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return false;
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}
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}
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}
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static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key,
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int hwnum, unsigned int *n)
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{
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struct gpiod_lookup_table *lookups;
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lookups = krealloc(aggr->lookups, struct_size(lookups, table, *n + 2),
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GFP_KERNEL);
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if (!lookups)
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return -ENOMEM;
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lookups->table[*n] =
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(struct gpiod_lookup)GPIO_LOOKUP_IDX(key, hwnum, NULL, *n, 0);
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(*n)++;
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memset(&lookups->table[*n], 0, sizeof(lookups->table[*n]));
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aggr->lookups = lookups;
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return 0;
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}
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static int aggr_parse(struct gpio_aggregator *aggr)
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{
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unsigned int first_index, last_index, i, n = 0;
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char *name, *offsets, *first, *last, *next;
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char *args = aggr->args;
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int error;
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for (name = get_arg(&args), offsets = get_arg(&args); name;
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offsets = get_arg(&args)) {
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if (IS_ERR(name)) {
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pr_err("Cannot get GPIO specifier: %pe\n", name);
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return PTR_ERR(name);
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}
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if (!isrange(offsets)) {
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/* Named GPIO line */
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error = aggr_add_gpio(aggr, name, U16_MAX, &n);
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if (error)
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return error;
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name = offsets;
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continue;
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}
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/* GPIO chip + offset(s) */
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for (first = offsets; *first; first = next) {
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next = strchrnul(first, ',');
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if (*next)
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*next++ = '\0';
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last = strchr(first, '-');
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if (last)
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*last++ = '\0';
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if (kstrtouint(first, 10, &first_index)) {
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pr_err("Cannot parse GPIO index %s\n", first);
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return -EINVAL;
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}
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if (!last) {
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last_index = first_index;
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} else if (kstrtouint(last, 10, &last_index)) {
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pr_err("Cannot parse GPIO index %s\n", last);
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return -EINVAL;
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}
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for (i = first_index; i <= last_index; i++) {
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error = aggr_add_gpio(aggr, name, i, &n);
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if (error)
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return error;
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}
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}
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name = get_arg(&args);
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}
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if (!n) {
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pr_err("No GPIOs specified\n");
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return -EINVAL;
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}
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return 0;
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}
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static ssize_t new_device_store(struct device_driver *driver, const char *buf,
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size_t count)
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{
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struct gpio_aggregator *aggr;
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struct platform_device *pdev;
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int res, id;
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/* kernfs guarantees string termination, so count + 1 is safe */
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aggr = kzalloc(sizeof(*aggr) + count + 1, GFP_KERNEL);
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if (!aggr)
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return -ENOMEM;
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memcpy(aggr->args, buf, count + 1);
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aggr->lookups = kzalloc(struct_size(aggr->lookups, table, 1),
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GFP_KERNEL);
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if (!aggr->lookups) {
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res = -ENOMEM;
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goto free_ga;
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}
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mutex_lock(&gpio_aggregator_lock);
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id = idr_alloc(&gpio_aggregator_idr, aggr, 0, 0, GFP_KERNEL);
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mutex_unlock(&gpio_aggregator_lock);
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if (id < 0) {
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res = id;
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goto free_table;
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}
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aggr->lookups->dev_id = kasprintf(GFP_KERNEL, "%s.%d", DRV_NAME, id);
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if (!aggr->lookups->dev_id) {
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res = -ENOMEM;
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goto remove_idr;
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}
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res = aggr_parse(aggr);
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if (res)
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goto free_dev_id;
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gpiod_add_lookup_table(aggr->lookups);
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pdev = platform_device_register_simple(DRV_NAME, id, NULL, 0);
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if (IS_ERR(pdev)) {
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res = PTR_ERR(pdev);
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goto remove_table;
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}
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aggr->pdev = pdev;
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return count;
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remove_table:
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gpiod_remove_lookup_table(aggr->lookups);
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free_dev_id:
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kfree(aggr->lookups->dev_id);
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remove_idr:
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mutex_lock(&gpio_aggregator_lock);
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idr_remove(&gpio_aggregator_idr, id);
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mutex_unlock(&gpio_aggregator_lock);
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free_table:
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kfree(aggr->lookups);
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free_ga:
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kfree(aggr);
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return res;
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}
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static DRIVER_ATTR_WO(new_device);
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static void gpio_aggregator_free(struct gpio_aggregator *aggr)
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{
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platform_device_unregister(aggr->pdev);
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gpiod_remove_lookup_table(aggr->lookups);
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kfree(aggr->lookups->dev_id);
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kfree(aggr->lookups);
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kfree(aggr);
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}
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static ssize_t delete_device_store(struct device_driver *driver,
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const char *buf, size_t count)
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{
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struct gpio_aggregator *aggr;
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unsigned int id;
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int error;
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if (!str_has_prefix(buf, DRV_NAME "."))
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return -EINVAL;
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error = kstrtouint(buf + strlen(DRV_NAME "."), 10, &id);
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if (error)
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return error;
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mutex_lock(&gpio_aggregator_lock);
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aggr = idr_remove(&gpio_aggregator_idr, id);
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mutex_unlock(&gpio_aggregator_lock);
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if (!aggr)
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return -ENOENT;
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gpio_aggregator_free(aggr);
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return count;
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}
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static DRIVER_ATTR_WO(delete_device);
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static struct attribute *gpio_aggregator_attrs[] = {
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&driver_attr_new_device.attr,
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&driver_attr_delete_device.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(gpio_aggregator);
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static int __exit gpio_aggregator_idr_remove(int id, void *p, void *data)
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{
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gpio_aggregator_free(p);
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return 0;
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}
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static void __exit gpio_aggregator_remove_all(void)
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{
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mutex_lock(&gpio_aggregator_lock);
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idr_for_each(&gpio_aggregator_idr, gpio_aggregator_idr_remove, NULL);
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idr_destroy(&gpio_aggregator_idr);
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mutex_unlock(&gpio_aggregator_lock);
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}
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/*
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* GPIO Forwarder
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*/
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struct gpiochip_fwd {
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struct gpio_chip chip;
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struct gpio_desc **descs;
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union {
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struct mutex mlock; /* protects tmp[] if can_sleep */
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spinlock_t slock; /* protects tmp[] if !can_sleep */
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};
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unsigned long tmp[]; /* values and descs for multiple ops */
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};
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static int gpio_fwd_get_direction(struct gpio_chip *chip, unsigned int offset)
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{
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struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
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return gpiod_get_direction(fwd->descs[offset]);
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}
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static int gpio_fwd_direction_input(struct gpio_chip *chip, unsigned int offset)
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{
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struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
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return gpiod_direction_input(fwd->descs[offset]);
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}
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static int gpio_fwd_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
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return gpiod_direction_output(fwd->descs[offset], value);
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}
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static int gpio_fwd_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
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return gpiod_get_value(fwd->descs[offset]);
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}
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static int gpio_fwd_get_multiple(struct gpio_chip *chip, unsigned long *mask,
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unsigned long *bits)
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{
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struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
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unsigned long *values, flags = 0;
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struct gpio_desc **descs;
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unsigned int i, j = 0;
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int error;
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if (chip->can_sleep)
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mutex_lock(&fwd->mlock);
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else
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spin_lock_irqsave(&fwd->slock, flags);
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/* Both values bitmap and desc pointers are stored in tmp[] */
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values = &fwd->tmp[0];
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descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)];
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bitmap_clear(values, 0, fwd->chip.ngpio);
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for_each_set_bit(i, mask, fwd->chip.ngpio)
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descs[j++] = fwd->descs[i];
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error = gpiod_get_array_value(j, descs, NULL, values);
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if (!error) {
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j = 0;
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for_each_set_bit(i, mask, fwd->chip.ngpio)
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__assign_bit(i, bits, test_bit(j++, values));
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}
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if (chip->can_sleep)
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mutex_unlock(&fwd->mlock);
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else
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spin_unlock_irqrestore(&fwd->slock, flags);
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return error;
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}
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static void gpio_fwd_set(struct gpio_chip *chip, unsigned int offset, int value)
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{
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struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
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gpiod_set_value(fwd->descs[offset], value);
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}
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static void gpio_fwd_set_multiple(struct gpio_chip *chip, unsigned long *mask,
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unsigned long *bits)
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{
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struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
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unsigned long *values, flags = 0;
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struct gpio_desc **descs;
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unsigned int i, j = 0;
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if (chip->can_sleep)
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mutex_lock(&fwd->mlock);
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else
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spin_lock_irqsave(&fwd->slock, flags);
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/* Both values bitmap and desc pointers are stored in tmp[] */
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values = &fwd->tmp[0];
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descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)];
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for_each_set_bit(i, mask, fwd->chip.ngpio) {
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__assign_bit(j, values, test_bit(i, bits));
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descs[j++] = fwd->descs[i];
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}
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gpiod_set_array_value(j, descs, NULL, values);
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if (chip->can_sleep)
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mutex_unlock(&fwd->mlock);
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else
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spin_unlock_irqrestore(&fwd->slock, flags);
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}
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static int gpio_fwd_set_config(struct gpio_chip *chip, unsigned int offset,
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unsigned long config)
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{
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struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
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return gpiod_set_config(fwd->descs[offset], config);
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}
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/**
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* gpiochip_fwd_create() - Create a new GPIO forwarder
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* @dev: Parent device pointer
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* @ngpios: Number of GPIOs in the forwarder.
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* @descs: Array containing the GPIO descriptors to forward to.
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* This array must contain @ngpios entries, and must not be deallocated
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* before the forwarder has been destroyed again.
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*
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* This function creates a new gpiochip, which forwards all GPIO operations to
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* the passed GPIO descriptors.
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*
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* Return: An opaque object pointer, or an ERR_PTR()-encoded negative error
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* code on failure.
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*/
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static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
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unsigned int ngpios,
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struct gpio_desc *descs[])
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{
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const char *label = dev_name(dev);
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struct gpiochip_fwd *fwd;
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struct gpio_chip *chip;
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unsigned int i;
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int error;
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|
||||
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");
|
||||
Loading…
Reference in New Issue
Block a user