forked from Minki/linux
db05c7ef54
Fix up a parameter description to match the code and fix markup for a constant to prettify output. Signed-off-by: Thierry Reding <treding@nvidia.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1213 lines
30 KiB
C
1213 lines
30 KiB
C
/*
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* ACPI helpers for GPIO API
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*
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* Copyright (C) 2012, Intel Corporation
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* Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/errno.h>
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#include <linux/gpio.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/export.h>
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#include <linux/acpi.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/pinctrl/pinctrl.h>
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#include "gpiolib.h"
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struct acpi_gpio_event {
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struct list_head node;
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acpi_handle handle;
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unsigned int pin;
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unsigned int irq;
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struct gpio_desc *desc;
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};
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struct acpi_gpio_connection {
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struct list_head node;
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unsigned int pin;
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struct gpio_desc *desc;
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};
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struct acpi_gpio_chip {
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/*
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* ACPICA requires that the first field of the context parameter
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* passed to acpi_install_address_space_handler() is large enough
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* to hold struct acpi_connection_info.
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*/
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struct acpi_connection_info conn_info;
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struct list_head conns;
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struct mutex conn_lock;
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struct gpio_chip *chip;
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struct list_head events;
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};
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static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
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{
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if (!gc->parent)
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return false;
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return ACPI_HANDLE(gc->parent) == data;
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}
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#ifdef CONFIG_PINCTRL
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/**
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* acpi_gpiochip_pin_to_gpio_offset() - translates ACPI GPIO to Linux GPIO
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* @gdev: GPIO device
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* @pin: ACPI GPIO pin number from GpioIo/GpioInt resource
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*
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* Function takes ACPI GpioIo/GpioInt pin number as a parameter and
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* translates it to a corresponding offset suitable to be passed to a
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* GPIO controller driver.
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*
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* Typically the returned offset is same as @pin, but if the GPIO
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* controller uses pin controller and the mapping is not contiguous the
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* offset might be different.
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*/
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static int acpi_gpiochip_pin_to_gpio_offset(struct gpio_device *gdev, int pin)
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{
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struct gpio_pin_range *pin_range;
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/* If there are no ranges in this chip, use 1:1 mapping */
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if (list_empty(&gdev->pin_ranges))
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return pin;
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list_for_each_entry(pin_range, &gdev->pin_ranges, node) {
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const struct pinctrl_gpio_range *range = &pin_range->range;
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int i;
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if (range->pins) {
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for (i = 0; i < range->npins; i++) {
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if (range->pins[i] == pin)
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return range->base + i - gdev->base;
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}
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} else {
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if (pin >= range->pin_base &&
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pin < range->pin_base + range->npins) {
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unsigned gpio_base;
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gpio_base = range->base - gdev->base;
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return gpio_base + pin - range->pin_base;
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}
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}
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}
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return -EINVAL;
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}
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#else
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static inline int acpi_gpiochip_pin_to_gpio_offset(struct gpio_device *gdev,
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int pin)
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{
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return pin;
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}
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#endif
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/**
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* acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
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* @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
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* @pin: ACPI GPIO pin number (0-based, controller-relative)
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*
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* Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
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* error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
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* controller does not have gpiochip registered at the moment. This is to
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* support probe deferral.
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*/
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static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
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{
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struct gpio_chip *chip;
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acpi_handle handle;
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acpi_status status;
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int offset;
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status = acpi_get_handle(NULL, path, &handle);
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if (ACPI_FAILURE(status))
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return ERR_PTR(-ENODEV);
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chip = gpiochip_find(handle, acpi_gpiochip_find);
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if (!chip)
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return ERR_PTR(-EPROBE_DEFER);
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offset = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
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if (offset < 0)
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return ERR_PTR(offset);
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return gpiochip_get_desc(chip, offset);
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}
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static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
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{
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struct acpi_gpio_event *event = data;
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acpi_evaluate_object(event->handle, NULL, NULL, NULL);
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return IRQ_HANDLED;
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}
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static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
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{
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struct acpi_gpio_event *event = data;
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acpi_execute_simple_method(event->handle, NULL, event->pin);
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return IRQ_HANDLED;
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}
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static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
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{
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/* The address of this function is used as a key. */
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}
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bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
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struct acpi_resource_gpio **agpio)
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{
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struct acpi_resource_gpio *gpio;
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if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
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return false;
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gpio = &ares->data.gpio;
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if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
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return false;
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*agpio = gpio;
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return true;
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}
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EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
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static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
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void *context)
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{
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struct acpi_gpio_chip *acpi_gpio = context;
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struct gpio_chip *chip = acpi_gpio->chip;
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struct acpi_resource_gpio *agpio;
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acpi_handle handle, evt_handle;
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struct acpi_gpio_event *event;
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irq_handler_t handler = NULL;
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struct gpio_desc *desc;
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unsigned long irqflags;
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int ret, pin, irq;
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if (!acpi_gpio_get_irq_resource(ares, &agpio))
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return AE_OK;
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handle = ACPI_HANDLE(chip->parent);
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pin = agpio->pin_table[0];
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if (pin <= 255) {
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char ev_name[5];
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sprintf(ev_name, "_%c%02X",
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agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
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pin);
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if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
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handler = acpi_gpio_irq_handler;
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}
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if (!handler) {
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
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handler = acpi_gpio_irq_handler_evt;
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}
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if (!handler)
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return AE_OK;
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pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
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if (pin < 0)
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return AE_BAD_PARAMETER;
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desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event");
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if (IS_ERR(desc)) {
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dev_err(chip->parent, "Failed to request GPIO\n");
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return AE_ERROR;
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}
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gpiod_direction_input(desc);
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ret = gpiochip_lock_as_irq(chip, pin);
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if (ret) {
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dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
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goto fail_free_desc;
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}
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irq = gpiod_to_irq(desc);
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if (irq < 0) {
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dev_err(chip->parent, "Failed to translate GPIO to IRQ\n");
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goto fail_unlock_irq;
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}
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irqflags = IRQF_ONESHOT;
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if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
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if (agpio->polarity == ACPI_ACTIVE_HIGH)
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irqflags |= IRQF_TRIGGER_HIGH;
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else
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irqflags |= IRQF_TRIGGER_LOW;
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} else {
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switch (agpio->polarity) {
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case ACPI_ACTIVE_HIGH:
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irqflags |= IRQF_TRIGGER_RISING;
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break;
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case ACPI_ACTIVE_LOW:
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irqflags |= IRQF_TRIGGER_FALLING;
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break;
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default:
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irqflags |= IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING;
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break;
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}
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}
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event = kzalloc(sizeof(*event), GFP_KERNEL);
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if (!event)
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goto fail_unlock_irq;
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event->handle = evt_handle;
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event->irq = irq;
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event->pin = pin;
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event->desc = desc;
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ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
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"ACPI:Event", event);
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if (ret) {
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dev_err(chip->parent,
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"Failed to setup interrupt handler for %d\n",
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event->irq);
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goto fail_free_event;
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}
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if (agpio->wake_capable == ACPI_WAKE_CAPABLE)
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enable_irq_wake(irq);
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list_add_tail(&event->node, &acpi_gpio->events);
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return AE_OK;
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fail_free_event:
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kfree(event);
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fail_unlock_irq:
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gpiochip_unlock_as_irq(chip, pin);
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fail_free_desc:
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gpiochip_free_own_desc(desc);
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return AE_ERROR;
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}
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/**
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* acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
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* @chip: GPIO chip
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*
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* ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
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* handled by ACPI event methods which need to be called from the GPIO
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* chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
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* gpio pins have acpi event methods and assigns interrupt handlers that calls
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* the acpi event methods for those pins.
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*/
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void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
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{
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struct acpi_gpio_chip *acpi_gpio;
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acpi_handle handle;
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acpi_status status;
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if (!chip->parent || !chip->to_irq)
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return;
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handle = ACPI_HANDLE(chip->parent);
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if (!handle)
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return;
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status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
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if (ACPI_FAILURE(status))
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return;
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acpi_walk_resources(handle, "_AEI",
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acpi_gpiochip_request_interrupt, acpi_gpio);
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}
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EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
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/**
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* acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
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* @chip: GPIO chip
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*
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* Free interrupts associated with GPIO ACPI event method for the given
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* GPIO chip.
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*/
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void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
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{
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struct acpi_gpio_chip *acpi_gpio;
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struct acpi_gpio_event *event, *ep;
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acpi_handle handle;
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acpi_status status;
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if (!chip->parent || !chip->to_irq)
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return;
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handle = ACPI_HANDLE(chip->parent);
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if (!handle)
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return;
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status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
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if (ACPI_FAILURE(status))
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return;
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list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
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struct gpio_desc *desc;
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if (irqd_is_wakeup_set(irq_get_irq_data(event->irq)))
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disable_irq_wake(event->irq);
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free_irq(event->irq, event);
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desc = event->desc;
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if (WARN_ON(IS_ERR(desc)))
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continue;
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gpiochip_unlock_as_irq(chip, event->pin);
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gpiochip_free_own_desc(desc);
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list_del(&event->node);
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kfree(event);
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}
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}
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EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
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int acpi_dev_add_driver_gpios(struct acpi_device *adev,
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const struct acpi_gpio_mapping *gpios)
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{
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if (adev && gpios) {
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adev->driver_gpios = gpios;
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return 0;
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
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static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
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{
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acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
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}
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int devm_acpi_dev_add_driver_gpios(struct device *dev,
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const struct acpi_gpio_mapping *gpios)
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{
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void *res;
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int ret;
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res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
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if (!res)
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return -ENOMEM;
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ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
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if (ret) {
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devres_free(res);
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return ret;
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}
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devres_add(dev, res);
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return 0;
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}
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EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
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void devm_acpi_dev_remove_driver_gpios(struct device *dev)
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{
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WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
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}
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EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
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static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
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const char *name, int index,
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struct acpi_reference_args *args)
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{
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const struct acpi_gpio_mapping *gm;
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if (!adev->driver_gpios)
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return false;
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for (gm = adev->driver_gpios; gm->name; gm++)
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if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
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const struct acpi_gpio_params *par = gm->data + index;
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args->adev = adev;
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args->args[0] = par->crs_entry_index;
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args->args[1] = par->line_index;
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args->args[2] = par->active_low;
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args->nargs = 3;
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return true;
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}
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return false;
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}
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static enum gpiod_flags
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acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio)
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{
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bool pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
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switch (agpio->io_restriction) {
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case ACPI_IO_RESTRICT_INPUT:
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return GPIOD_IN;
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case ACPI_IO_RESTRICT_OUTPUT:
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/*
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* ACPI GPIO resources don't contain an initial value for the
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* GPIO. Therefore we deduce that value from the pull field
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* instead. If the pin is pulled up we assume default to be
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* high, otherwise low.
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*/
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return pull_up ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
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default:
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/*
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* Assume that the BIOS has configured the direction and pull
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* accordingly.
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*/
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return GPIOD_ASIS;
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}
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}
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int
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acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
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{
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int ret = 0;
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/*
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* Check if the BIOS has IoRestriction with explicitly set direction
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* and update @flags accordingly. Otherwise use whatever caller asked
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* for.
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*/
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if (update & GPIOD_FLAGS_BIT_DIR_SET) {
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enum gpiod_flags diff = *flags ^ update;
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/*
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* Check if caller supplied incompatible GPIO initialization
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* flags.
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*
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* Return %-EINVAL to notify that firmware has different
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* settings and we are going to use them.
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*/
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if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
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((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
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ret = -EINVAL;
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*flags = update;
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}
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return ret;
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}
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struct acpi_gpio_lookup {
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struct acpi_gpio_info info;
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int index;
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int pin_index;
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bool active_low;
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struct acpi_device *adev;
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struct gpio_desc *desc;
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int n;
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};
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static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
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{
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struct acpi_gpio_lookup *lookup = data;
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if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
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return 1;
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|
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if (lookup->n++ == lookup->index && !lookup->desc) {
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const struct acpi_resource_gpio *agpio = &ares->data.gpio;
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int pin_index = lookup->pin_index;
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if (pin_index >= agpio->pin_table_length)
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return 1;
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|
|
|
lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
|
|
agpio->pin_table[pin_index]);
|
|
lookup->info.gpioint =
|
|
agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
|
|
|
|
/*
|
|
* Polarity and triggering are only specified for GpioInt
|
|
* resource.
|
|
* Note: we expect here:
|
|
* - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
|
|
* - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
|
|
*/
|
|
if (lookup->info.gpioint) {
|
|
lookup->info.flags = GPIOD_IN;
|
|
lookup->info.polarity = agpio->polarity;
|
|
lookup->info.triggering = agpio->triggering;
|
|
} else {
|
|
lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio);
|
|
}
|
|
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
|
|
struct acpi_gpio_info *info)
|
|
{
|
|
struct list_head res_list;
|
|
int ret;
|
|
|
|
INIT_LIST_HEAD(&res_list);
|
|
|
|
ret = acpi_dev_get_resources(lookup->adev, &res_list,
|
|
acpi_populate_gpio_lookup,
|
|
lookup);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
acpi_dev_free_resource_list(&res_list);
|
|
|
|
if (!lookup->desc)
|
|
return -ENOENT;
|
|
|
|
if (info) {
|
|
*info = lookup->info;
|
|
if (lookup->active_low)
|
|
info->polarity = lookup->active_low;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
|
|
const char *propname, int index,
|
|
struct acpi_gpio_lookup *lookup)
|
|
{
|
|
struct acpi_reference_args args;
|
|
int ret;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
|
|
&args);
|
|
if (ret) {
|
|
struct acpi_device *adev = to_acpi_device_node(fwnode);
|
|
|
|
if (!adev)
|
|
return ret;
|
|
|
|
if (!acpi_get_driver_gpio_data(adev, propname, index, &args))
|
|
return ret;
|
|
}
|
|
/*
|
|
* The property was found and resolved, so need to lookup the GPIO based
|
|
* on returned args.
|
|
*/
|
|
lookup->adev = args.adev;
|
|
if (args.nargs != 3)
|
|
return -EPROTO;
|
|
|
|
lookup->index = args.args[0];
|
|
lookup->pin_index = args.args[1];
|
|
lookup->active_low = !!args.args[2];
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
|
|
* @adev: pointer to a ACPI device to get GPIO from
|
|
* @propname: Property name of the GPIO (optional)
|
|
* @index: index of GpioIo/GpioInt resource (starting from %0)
|
|
* @info: info pointer to fill in (optional)
|
|
*
|
|
* Function goes through ACPI resources for @adev and based on @index looks
|
|
* up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
|
|
* and returns it. @index matches GpioIo/GpioInt resources only so if there
|
|
* are total %3 GPIO resources, the index goes from %0 to %2.
|
|
*
|
|
* If @propname is specified the GPIO is looked using device property. In
|
|
* that case @index is used to select the GPIO entry in the property value
|
|
* (in case of multiple).
|
|
*
|
|
* If the GPIO cannot be translated or there is an error an ERR_PTR is
|
|
* returned.
|
|
*
|
|
* Note: if the GPIO resource has multiple entries in the pin list, this
|
|
* function only returns the first.
|
|
*/
|
|
static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
|
|
const char *propname, int index,
|
|
struct acpi_gpio_info *info)
|
|
{
|
|
struct acpi_gpio_lookup lookup;
|
|
int ret;
|
|
|
|
if (!adev)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.index = index;
|
|
|
|
if (propname) {
|
|
dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
|
|
|
|
ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
|
|
propname, index, &lookup);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
|
|
dev_name(&lookup.adev->dev), lookup.index,
|
|
lookup.pin_index, lookup.active_low);
|
|
} else {
|
|
dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
|
|
lookup.adev = adev;
|
|
}
|
|
|
|
ret = acpi_gpio_resource_lookup(&lookup, info);
|
|
return ret ? ERR_PTR(ret) : lookup.desc;
|
|
}
|
|
|
|
struct gpio_desc *acpi_find_gpio(struct device *dev,
|
|
const char *con_id,
|
|
unsigned int idx,
|
|
enum gpiod_flags *dflags,
|
|
enum gpio_lookup_flags *lookupflags)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
struct acpi_gpio_info info;
|
|
struct gpio_desc *desc;
|
|
char propname[32];
|
|
int err;
|
|
int i;
|
|
|
|
/* Try first from _DSD */
|
|
for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
|
|
if (con_id) {
|
|
snprintf(propname, sizeof(propname), "%s-%s",
|
|
con_id, gpio_suffixes[i]);
|
|
} else {
|
|
snprintf(propname, sizeof(propname), "%s",
|
|
gpio_suffixes[i]);
|
|
}
|
|
|
|
desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
|
|
if (!IS_ERR(desc))
|
|
break;
|
|
if (PTR_ERR(desc) == -EPROBE_DEFER)
|
|
return ERR_CAST(desc);
|
|
}
|
|
|
|
/* Then from plain _CRS GPIOs */
|
|
if (IS_ERR(desc)) {
|
|
if (!acpi_can_fallback_to_crs(adev, con_id))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
|
|
if (IS_ERR(desc))
|
|
return desc;
|
|
}
|
|
|
|
if (info.gpioint &&
|
|
(*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
|
|
dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
if (info.polarity == GPIO_ACTIVE_LOW)
|
|
*lookupflags |= GPIO_ACTIVE_LOW;
|
|
|
|
err = acpi_gpio_update_gpiod_flags(dflags, info.flags);
|
|
if (err)
|
|
dev_dbg(dev, "Override GPIO initialization flags\n");
|
|
|
|
return desc;
|
|
}
|
|
|
|
/**
|
|
* acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
|
|
* @fwnode: pointer to an ACPI firmware node to get the GPIO information from
|
|
* @propname: Property name of the GPIO
|
|
* @index: index of GpioIo/GpioInt resource (starting from %0)
|
|
* @info: info pointer to fill in (optional)
|
|
*
|
|
* If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
|
|
* Otherwise (ie. it is a data-only non-device object), use the property-based
|
|
* GPIO lookup to get to the GPIO resource with the relevant information and use
|
|
* that to obtain the GPIO descriptor to return.
|
|
*/
|
|
struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
|
|
const char *propname, int index,
|
|
struct acpi_gpio_info *info)
|
|
{
|
|
struct acpi_gpio_lookup lookup;
|
|
struct acpi_device *adev;
|
|
int ret;
|
|
|
|
adev = to_acpi_device_node(fwnode);
|
|
if (adev)
|
|
return acpi_get_gpiod_by_index(adev, propname, index, info);
|
|
|
|
if (!is_acpi_data_node(fwnode))
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
if (!propname)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.index = index;
|
|
|
|
ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
ret = acpi_gpio_resource_lookup(&lookup, info);
|
|
return ret ? ERR_PTR(ret) : lookup.desc;
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
|
|
* @adev: pointer to a ACPI device to get IRQ from
|
|
* @index: index of GpioInt resource (starting from %0)
|
|
*
|
|
* If the device has one or more GpioInt resources, this function can be
|
|
* used to translate from the GPIO offset in the resource to the Linux IRQ
|
|
* number.
|
|
*
|
|
* The function is idempotent, though each time it runs it will configure GPIO
|
|
* pin direction according to the flags in GpioInt resource.
|
|
*
|
|
* Return: Linux IRQ number (> %0) on success, negative errno on failure.
|
|
*/
|
|
int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
|
|
{
|
|
int idx, i;
|
|
unsigned int irq_flags;
|
|
int ret;
|
|
|
|
for (i = 0, idx = 0; idx <= index; i++) {
|
|
struct acpi_gpio_info info;
|
|
struct gpio_desc *desc;
|
|
|
|
desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
|
|
|
|
/* Ignore -EPROBE_DEFER, it only matters if idx matches */
|
|
if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
|
|
return PTR_ERR(desc);
|
|
|
|
if (info.gpioint && idx++ == index) {
|
|
char label[32];
|
|
int irq;
|
|
|
|
if (IS_ERR(desc))
|
|
return PTR_ERR(desc);
|
|
|
|
irq = gpiod_to_irq(desc);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
snprintf(label, sizeof(label), "GpioInt() %d", index);
|
|
ret = gpiod_configure_flags(desc, label, 0, info.flags);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
irq_flags = acpi_dev_get_irq_type(info.triggering,
|
|
info.polarity);
|
|
|
|
/* Set type if specified and different than the current one */
|
|
if (irq_flags != IRQ_TYPE_NONE &&
|
|
irq_flags != irq_get_trigger_type(irq))
|
|
irq_set_irq_type(irq, irq_flags);
|
|
|
|
return irq;
|
|
}
|
|
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
|
|
|
|
static acpi_status
|
|
acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
|
|
u32 bits, u64 *value, void *handler_context,
|
|
void *region_context)
|
|
{
|
|
struct acpi_gpio_chip *achip = region_context;
|
|
struct gpio_chip *chip = achip->chip;
|
|
struct acpi_resource_gpio *agpio;
|
|
struct acpi_resource *ares;
|
|
int pin_index = (int)address;
|
|
acpi_status status;
|
|
int length;
|
|
int i;
|
|
|
|
status = acpi_buffer_to_resource(achip->conn_info.connection,
|
|
achip->conn_info.length, &ares);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
|
|
ACPI_FREE(ares);
|
|
return AE_BAD_PARAMETER;
|
|
}
|
|
|
|
agpio = &ares->data.gpio;
|
|
|
|
if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
|
|
function == ACPI_WRITE)) {
|
|
ACPI_FREE(ares);
|
|
return AE_BAD_PARAMETER;
|
|
}
|
|
|
|
length = min(agpio->pin_table_length, (u16)(pin_index + bits));
|
|
for (i = pin_index; i < length; ++i) {
|
|
int pin = agpio->pin_table[i];
|
|
struct acpi_gpio_connection *conn;
|
|
struct gpio_desc *desc;
|
|
bool found;
|
|
|
|
pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
|
|
if (pin < 0) {
|
|
status = AE_BAD_PARAMETER;
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&achip->conn_lock);
|
|
|
|
found = false;
|
|
list_for_each_entry(conn, &achip->conns, node) {
|
|
if (conn->pin == pin) {
|
|
found = true;
|
|
desc = conn->desc;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The same GPIO can be shared between operation region and
|
|
* event but only if the access here is ACPI_READ. In that
|
|
* case we "borrow" the event GPIO instead.
|
|
*/
|
|
if (!found && agpio->sharable == ACPI_SHARED &&
|
|
function == ACPI_READ) {
|
|
struct acpi_gpio_event *event;
|
|
|
|
list_for_each_entry(event, &achip->events, node) {
|
|
if (event->pin == pin) {
|
|
desc = event->desc;
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
|
|
const char *label = "ACPI:OpRegion";
|
|
int err;
|
|
|
|
desc = gpiochip_request_own_desc(chip, pin, label);
|
|
if (IS_ERR(desc)) {
|
|
status = AE_ERROR;
|
|
mutex_unlock(&achip->conn_lock);
|
|
goto out;
|
|
}
|
|
|
|
err = gpiod_configure_flags(desc, label, 0, flags);
|
|
if (err < 0) {
|
|
status = AE_NOT_CONFIGURED;
|
|
gpiochip_free_own_desc(desc);
|
|
mutex_unlock(&achip->conn_lock);
|
|
goto out;
|
|
}
|
|
|
|
conn = kzalloc(sizeof(*conn), GFP_KERNEL);
|
|
if (!conn) {
|
|
status = AE_NO_MEMORY;
|
|
gpiochip_free_own_desc(desc);
|
|
mutex_unlock(&achip->conn_lock);
|
|
goto out;
|
|
}
|
|
|
|
conn->pin = pin;
|
|
conn->desc = desc;
|
|
list_add_tail(&conn->node, &achip->conns);
|
|
}
|
|
|
|
mutex_unlock(&achip->conn_lock);
|
|
|
|
if (function == ACPI_WRITE)
|
|
gpiod_set_raw_value_cansleep(desc,
|
|
!!((1 << i) & *value));
|
|
else
|
|
*value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
|
|
}
|
|
|
|
out:
|
|
ACPI_FREE(ares);
|
|
return status;
|
|
}
|
|
|
|
static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
acpi_handle handle = ACPI_HANDLE(chip->parent);
|
|
acpi_status status;
|
|
|
|
INIT_LIST_HEAD(&achip->conns);
|
|
mutex_init(&achip->conn_lock);
|
|
status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
|
|
acpi_gpio_adr_space_handler,
|
|
NULL, achip);
|
|
if (ACPI_FAILURE(status))
|
|
dev_err(chip->parent,
|
|
"Failed to install GPIO OpRegion handler\n");
|
|
}
|
|
|
|
static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
acpi_handle handle = ACPI_HANDLE(chip->parent);
|
|
struct acpi_gpio_connection *conn, *tmp;
|
|
acpi_status status;
|
|
|
|
status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
|
|
acpi_gpio_adr_space_handler);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(chip->parent,
|
|
"Failed to remove GPIO OpRegion handler\n");
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
|
|
gpiochip_free_own_desc(conn->desc);
|
|
list_del(&conn->node);
|
|
kfree(conn);
|
|
}
|
|
}
|
|
|
|
static struct gpio_desc *acpi_gpiochip_parse_own_gpio(
|
|
struct acpi_gpio_chip *achip, struct fwnode_handle *fwnode,
|
|
const char **name, unsigned int *lflags, unsigned int *dflags)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
struct gpio_desc *desc;
|
|
u32 gpios[2];
|
|
int ret;
|
|
|
|
*lflags = 0;
|
|
*dflags = 0;
|
|
*name = NULL;
|
|
|
|
ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
|
|
ARRAY_SIZE(gpios));
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
ret = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, gpios[0]);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
desc = gpiochip_get_desc(chip, ret);
|
|
if (IS_ERR(desc))
|
|
return desc;
|
|
|
|
if (gpios[1])
|
|
*lflags |= GPIO_ACTIVE_LOW;
|
|
|
|
if (fwnode_property_present(fwnode, "input"))
|
|
*dflags |= GPIOD_IN;
|
|
else if (fwnode_property_present(fwnode, "output-low"))
|
|
*dflags |= GPIOD_OUT_LOW;
|
|
else if (fwnode_property_present(fwnode, "output-high"))
|
|
*dflags |= GPIOD_OUT_HIGH;
|
|
else
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
fwnode_property_read_string(fwnode, "line-name", name);
|
|
|
|
return desc;
|
|
}
|
|
|
|
static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
struct fwnode_handle *fwnode;
|
|
|
|
device_for_each_child_node(chip->parent, fwnode) {
|
|
unsigned int lflags, dflags;
|
|
struct gpio_desc *desc;
|
|
const char *name;
|
|
int ret;
|
|
|
|
if (!fwnode_property_present(fwnode, "gpio-hog"))
|
|
continue;
|
|
|
|
desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
|
|
&lflags, &dflags);
|
|
if (IS_ERR(desc))
|
|
continue;
|
|
|
|
ret = gpiod_hog(desc, name, lflags, dflags);
|
|
if (ret) {
|
|
dev_err(chip->parent, "Failed to hog GPIO\n");
|
|
fwnode_handle_put(fwnode);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
void acpi_gpiochip_add(struct gpio_chip *chip)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (!chip || !chip->parent)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(chip->parent);
|
|
if (!handle)
|
|
return;
|
|
|
|
acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
|
|
if (!acpi_gpio) {
|
|
dev_err(chip->parent,
|
|
"Failed to allocate memory for ACPI GPIO chip\n");
|
|
return;
|
|
}
|
|
|
|
acpi_gpio->chip = chip;
|
|
INIT_LIST_HEAD(&acpi_gpio->events);
|
|
|
|
status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
|
|
kfree(acpi_gpio);
|
|
return;
|
|
}
|
|
|
|
if (!chip->names)
|
|
devprop_gpiochip_set_names(chip);
|
|
|
|
acpi_gpiochip_request_regions(acpi_gpio);
|
|
acpi_gpiochip_scan_gpios(acpi_gpio);
|
|
acpi_walk_dep_device_list(handle);
|
|
}
|
|
|
|
void acpi_gpiochip_remove(struct gpio_chip *chip)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (!chip || !chip->parent)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(chip->parent);
|
|
if (!handle)
|
|
return;
|
|
|
|
status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
|
|
return;
|
|
}
|
|
|
|
acpi_gpiochip_free_regions(acpi_gpio);
|
|
|
|
acpi_detach_data(handle, acpi_gpio_chip_dh);
|
|
kfree(acpi_gpio);
|
|
}
|
|
|
|
static int acpi_gpio_package_count(const union acpi_object *obj)
|
|
{
|
|
const union acpi_object *element = obj->package.elements;
|
|
const union acpi_object *end = element + obj->package.count;
|
|
unsigned int count = 0;
|
|
|
|
while (element < end) {
|
|
switch (element->type) {
|
|
case ACPI_TYPE_LOCAL_REFERENCE:
|
|
element += 3;
|
|
/* Fallthrough */
|
|
case ACPI_TYPE_INTEGER:
|
|
element++;
|
|
count++;
|
|
break;
|
|
|
|
default:
|
|
return -EPROTO;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
|
|
{
|
|
unsigned int *count = data;
|
|
|
|
if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
|
|
*count += ares->data.gpio.pin_table_length;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* acpi_gpio_count - return the number of GPIOs associated with a
|
|
* device / function or -ENOENT if no GPIO has been
|
|
* assigned to the requested function.
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
*/
|
|
int acpi_gpio_count(struct device *dev, const char *con_id)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
const union acpi_object *obj;
|
|
const struct acpi_gpio_mapping *gm;
|
|
int count = -ENOENT;
|
|
int ret;
|
|
char propname[32];
|
|
unsigned int i;
|
|
|
|
/* Try first from _DSD */
|
|
for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
|
|
if (con_id)
|
|
snprintf(propname, sizeof(propname), "%s-%s",
|
|
con_id, gpio_suffixes[i]);
|
|
else
|
|
snprintf(propname, sizeof(propname), "%s",
|
|
gpio_suffixes[i]);
|
|
|
|
ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
|
|
&obj);
|
|
if (ret == 0) {
|
|
if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
|
|
count = 1;
|
|
else if (obj->type == ACPI_TYPE_PACKAGE)
|
|
count = acpi_gpio_package_count(obj);
|
|
} else if (adev->driver_gpios) {
|
|
for (gm = adev->driver_gpios; gm->name; gm++)
|
|
if (strcmp(propname, gm->name) == 0) {
|
|
count = gm->size;
|
|
break;
|
|
}
|
|
}
|
|
if (count > 0)
|
|
break;
|
|
}
|
|
|
|
/* Then from plain _CRS GPIOs */
|
|
if (count < 0) {
|
|
struct list_head resource_list;
|
|
unsigned int crs_count = 0;
|
|
|
|
if (!acpi_can_fallback_to_crs(adev, con_id))
|
|
return count;
|
|
|
|
INIT_LIST_HEAD(&resource_list);
|
|
acpi_dev_get_resources(adev, &resource_list,
|
|
acpi_find_gpio_count, &crs_count);
|
|
acpi_dev_free_resource_list(&resource_list);
|
|
if (crs_count > 0)
|
|
count = crs_count;
|
|
}
|
|
return count ? count : -ENOENT;
|
|
}
|
|
|
|
bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
|
|
{
|
|
/* Never allow fallback if the device has properties */
|
|
if (adev->data.properties || adev->driver_gpios)
|
|
return false;
|
|
|
|
return con_id == NULL;
|
|
}
|