2581 lines
68 KiB
C
2581 lines
68 KiB
C
#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <linux/acpi.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/pinctrl/consumer.h>
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#include "gpiolib.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/gpio.h>
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/* Implementation infrastructure for GPIO interfaces.
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*
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* The GPIO programming interface allows for inlining speed-critical
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* get/set operations for common cases, so that access to SOC-integrated
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* GPIOs can sometimes cost only an instruction or two per bit.
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*/
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/* When debugging, extend minimal trust to callers and platform code.
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* Also emit diagnostic messages that may help initial bringup, when
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* board setup or driver bugs are most common.
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*
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* Otherwise, minimize overhead in what may be bitbanging codepaths.
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*/
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#ifdef DEBUG
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#define extra_checks 1
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#else
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#define extra_checks 0
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#endif
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/* gpio_lock prevents conflicts during gpio_desc[] table updates.
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* While any GPIO is requested, its gpio_chip is not removable;
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* each GPIO's "requested" flag serves as a lock and refcount.
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*/
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DEFINE_SPINLOCK(gpio_lock);
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static DEFINE_MUTEX(gpio_lookup_lock);
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static LIST_HEAD(gpio_lookup_list);
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LIST_HEAD(gpio_chips);
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static void gpiochip_free_hogs(struct gpio_chip *chip);
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static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
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static inline void desc_set_label(struct gpio_desc *d, const char *label)
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{
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d->label = label;
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}
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/**
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* Convert a GPIO number to its descriptor
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*/
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struct gpio_desc *gpio_to_desc(unsigned gpio)
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{
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struct gpio_chip *chip;
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unsigned long flags;
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spin_lock_irqsave(&gpio_lock, flags);
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list_for_each_entry(chip, &gpio_chips, list) {
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if (chip->base <= gpio && chip->base + chip->ngpio > gpio) {
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spin_unlock_irqrestore(&gpio_lock, flags);
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return &chip->desc[gpio - chip->base];
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}
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}
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spin_unlock_irqrestore(&gpio_lock, flags);
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if (!gpio_is_valid(gpio))
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WARN(1, "invalid GPIO %d\n", gpio);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(gpio_to_desc);
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/**
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* Get the GPIO descriptor corresponding to the given hw number for this chip.
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*/
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struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
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u16 hwnum)
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{
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if (hwnum >= chip->ngpio)
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return ERR_PTR(-EINVAL);
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return &chip->desc[hwnum];
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}
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/**
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* Convert a GPIO descriptor to the integer namespace.
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* This should disappear in the future but is needed since we still
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* use GPIO numbers for error messages and sysfs nodes
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*/
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int desc_to_gpio(const struct gpio_desc *desc)
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{
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return desc->chip->base + (desc - &desc->chip->desc[0]);
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}
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EXPORT_SYMBOL_GPL(desc_to_gpio);
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/**
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* gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
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* @desc: descriptor to return the chip of
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*/
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struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
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{
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return desc ? desc->chip : NULL;
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}
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EXPORT_SYMBOL_GPL(gpiod_to_chip);
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/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
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static int gpiochip_find_base(int ngpio)
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{
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struct gpio_chip *chip;
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int base = ARCH_NR_GPIOS - ngpio;
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list_for_each_entry_reverse(chip, &gpio_chips, list) {
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/* found a free space? */
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if (chip->base + chip->ngpio <= base)
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break;
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else
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/* nope, check the space right before the chip */
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base = chip->base - ngpio;
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}
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if (gpio_is_valid(base)) {
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pr_debug("%s: found new base at %d\n", __func__, base);
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return base;
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} else {
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pr_err("%s: cannot find free range\n", __func__);
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return -ENOSPC;
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}
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}
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/**
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* gpiod_get_direction - return the current direction of a GPIO
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* @desc: GPIO to get the direction of
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*
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* Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error.
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*
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* This function may sleep if gpiod_cansleep() is true.
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*/
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int gpiod_get_direction(struct gpio_desc *desc)
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{
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struct gpio_chip *chip;
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unsigned offset;
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int status = -EINVAL;
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chip = gpiod_to_chip(desc);
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offset = gpio_chip_hwgpio(desc);
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if (!chip->get_direction)
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return status;
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status = chip->get_direction(chip, offset);
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if (status > 0) {
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/* GPIOF_DIR_IN, or other positive */
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status = 1;
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clear_bit(FLAG_IS_OUT, &desc->flags);
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}
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if (status == 0) {
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/* GPIOF_DIR_OUT */
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set_bit(FLAG_IS_OUT, &desc->flags);
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}
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return status;
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}
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EXPORT_SYMBOL_GPL(gpiod_get_direction);
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/*
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* Add a new chip to the global chips list, keeping the list of chips sorted
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* by range(means [base, base + ngpio - 1]) order.
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*
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* Return -EBUSY if the new chip overlaps with some other chip's integer
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* space.
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*/
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static int gpiochip_add_to_list(struct gpio_chip *chip)
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{
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struct list_head *pos;
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struct gpio_chip *iterator;
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struct gpio_chip *previous = NULL;
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if (list_empty(&gpio_chips)) {
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pos = gpio_chips.next;
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goto found;
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}
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list_for_each(pos, &gpio_chips) {
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iterator = list_entry(pos, struct gpio_chip, list);
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if (iterator->base >= chip->base + chip->ngpio) {
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/*
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* Iterator is the first GPIO chip so there is no
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* previous one
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*/
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if (previous == NULL) {
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goto found;
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} else {
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/*
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* We found a valid range(means
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* [base, base + ngpio - 1]) between previous
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* and iterator chip.
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*/
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if (previous->base + previous->ngpio
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<= chip->base)
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goto found;
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}
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}
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previous = iterator;
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}
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/* We are beyond the last chip in the list */
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if (iterator->base + iterator->ngpio <= chip->base)
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goto found;
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dev_err(chip->parent,
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"GPIO integer space overlap, cannot add chip\n");
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return -EBUSY;
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found:
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list_add_tail(&chip->list, pos);
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return 0;
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}
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/**
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* Convert a GPIO name to its descriptor
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*/
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static struct gpio_desc *gpio_name_to_desc(const char * const name)
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{
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struct gpio_chip *chip;
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unsigned long flags;
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spin_lock_irqsave(&gpio_lock, flags);
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list_for_each_entry(chip, &gpio_chips, list) {
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int i;
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for (i = 0; i != chip->ngpio; ++i) {
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struct gpio_desc *gpio = &chip->desc[i];
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if (!gpio->name)
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continue;
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if (!strcmp(gpio->name, name)) {
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spin_unlock_irqrestore(&gpio_lock, flags);
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return gpio;
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}
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}
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}
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spin_unlock_irqrestore(&gpio_lock, flags);
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return NULL;
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}
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/*
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* Takes the names from gc->names and checks if they are all unique. If they
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* are, they are assigned to their gpio descriptors.
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*
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* Warning if one of the names is already used for a different GPIO.
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*/
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static int gpiochip_set_desc_names(struct gpio_chip *gc)
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{
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int i;
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if (!gc->names)
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return 0;
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/* First check all names if they are unique */
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for (i = 0; i != gc->ngpio; ++i) {
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struct gpio_desc *gpio;
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gpio = gpio_name_to_desc(gc->names[i]);
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if (gpio)
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dev_warn(gc->parent, "Detected name collision for "
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"GPIO name '%s'\n",
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gc->names[i]);
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}
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/* Then add all names to the GPIO descriptors */
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for (i = 0; i != gc->ngpio; ++i)
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gc->desc[i].name = gc->names[i];
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return 0;
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}
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/**
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* gpiochip_add() - register a gpio_chip
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* @chip: the chip to register, with chip->base initialized
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* Context: potentially before irqs will work
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*
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* Returns a negative errno if the chip can't be registered, such as
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* because the chip->base is invalid or already associated with a
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* different chip. Otherwise it returns zero as a success code.
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*
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* When gpiochip_add() is called very early during boot, so that GPIOs
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* can be freely used, the chip->parent device must be registered before
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* the gpio framework's arch_initcall(). Otherwise sysfs initialization
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* for GPIOs will fail rudely.
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*
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* If chip->base is negative, this requests dynamic assignment of
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* a range of valid GPIOs.
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*/
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int gpiochip_add(struct gpio_chip *chip)
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{
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unsigned long flags;
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int status = 0;
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unsigned id;
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int base = chip->base;
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struct gpio_desc *descs;
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descs = kcalloc(chip->ngpio, sizeof(descs[0]), GFP_KERNEL);
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if (!descs)
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return -ENOMEM;
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if (chip->ngpio == 0) {
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chip_err(chip, "tried to insert a GPIO chip with zero lines\n");
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return -EINVAL;
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}
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spin_lock_irqsave(&gpio_lock, flags);
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if (base < 0) {
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base = gpiochip_find_base(chip->ngpio);
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if (base < 0) {
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status = base;
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spin_unlock_irqrestore(&gpio_lock, flags);
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goto err_free_descs;
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}
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chip->base = base;
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}
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status = gpiochip_add_to_list(chip);
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if (status) {
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spin_unlock_irqrestore(&gpio_lock, flags);
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goto err_free_descs;
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}
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for (id = 0; id < chip->ngpio; id++) {
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struct gpio_desc *desc = &descs[id];
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desc->chip = chip;
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/* REVISIT: most hardware initializes GPIOs as inputs (often
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* with pullups enabled) so power usage is minimized. Linux
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* code should set the gpio direction first thing; but until
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* it does, and in case chip->get_direction is not set, we may
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* expose the wrong direction in sysfs.
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*/
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desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0;
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}
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chip->desc = descs;
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spin_unlock_irqrestore(&gpio_lock, flags);
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#ifdef CONFIG_PINCTRL
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INIT_LIST_HEAD(&chip->pin_ranges);
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#endif
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if (!chip->owner && chip->parent && chip->parent->driver)
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chip->owner = chip->parent->driver->owner;
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status = gpiochip_set_desc_names(chip);
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if (status)
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goto err_remove_from_list;
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status = of_gpiochip_add(chip);
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if (status)
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goto err_remove_chip;
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acpi_gpiochip_add(chip);
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status = gpiochip_sysfs_register(chip);
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if (status)
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goto err_remove_chip;
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pr_debug("%s: registered GPIOs %d to %d on device: %s\n", __func__,
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chip->base, chip->base + chip->ngpio - 1,
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chip->label ? : "generic");
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return 0;
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err_remove_chip:
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acpi_gpiochip_remove(chip);
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gpiochip_free_hogs(chip);
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of_gpiochip_remove(chip);
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err_remove_from_list:
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spin_lock_irqsave(&gpio_lock, flags);
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list_del(&chip->list);
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spin_unlock_irqrestore(&gpio_lock, flags);
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chip->desc = NULL;
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err_free_descs:
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kfree(descs);
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/* failures here can mean systems won't boot... */
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pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__,
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chip->base, chip->base + chip->ngpio - 1,
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chip->label ? : "generic");
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return status;
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}
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EXPORT_SYMBOL_GPL(gpiochip_add);
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/**
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* gpiochip_remove() - unregister a gpio_chip
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* @chip: the chip to unregister
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*
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* A gpio_chip with any GPIOs still requested may not be removed.
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*/
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void gpiochip_remove(struct gpio_chip *chip)
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{
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struct gpio_desc *desc;
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unsigned long flags;
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unsigned id;
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bool requested = false;
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gpiochip_sysfs_unregister(chip);
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gpiochip_irqchip_remove(chip);
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acpi_gpiochip_remove(chip);
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gpiochip_remove_pin_ranges(chip);
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gpiochip_free_hogs(chip);
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of_gpiochip_remove(chip);
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spin_lock_irqsave(&gpio_lock, flags);
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for (id = 0; id < chip->ngpio; id++) {
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desc = &chip->desc[id];
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desc->chip = NULL;
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if (test_bit(FLAG_REQUESTED, &desc->flags))
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requested = true;
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}
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list_del(&chip->list);
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spin_unlock_irqrestore(&gpio_lock, flags);
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if (requested)
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dev_crit(chip->parent,
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"REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n");
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kfree(chip->desc);
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chip->desc = NULL;
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}
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EXPORT_SYMBOL_GPL(gpiochip_remove);
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/**
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* gpiochip_find() - iterator for locating a specific gpio_chip
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* @data: data to pass to match function
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* @callback: Callback function to check gpio_chip
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*
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* Similar to bus_find_device. It returns a reference to a gpio_chip as
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* determined by a user supplied @match callback. The callback should return
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* 0 if the device doesn't match and non-zero if it does. If the callback is
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* non-zero, this function will return to the caller and not iterate over any
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* more gpio_chips.
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*/
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struct gpio_chip *gpiochip_find(void *data,
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int (*match)(struct gpio_chip *chip,
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void *data))
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{
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struct gpio_chip *chip;
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unsigned long flags;
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spin_lock_irqsave(&gpio_lock, flags);
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list_for_each_entry(chip, &gpio_chips, list)
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if (match(chip, data))
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break;
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/* No match? */
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if (&chip->list == &gpio_chips)
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chip = NULL;
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spin_unlock_irqrestore(&gpio_lock, flags);
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return chip;
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}
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EXPORT_SYMBOL_GPL(gpiochip_find);
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static int gpiochip_match_name(struct gpio_chip *chip, void *data)
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{
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const char *name = data;
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return !strcmp(chip->label, name);
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}
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static struct gpio_chip *find_chip_by_name(const char *name)
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{
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return gpiochip_find((void *)name, gpiochip_match_name);
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}
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|
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#ifdef CONFIG_GPIOLIB_IRQCHIP
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/*
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* The following is irqchip helper code for gpiochips.
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*/
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|
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/**
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* gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip
|
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* @gpiochip: the gpiochip to set the irqchip chain to
|
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* @irqchip: the irqchip to chain to the gpiochip
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* @parent_irq: the irq number corresponding to the parent IRQ for this
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* chained irqchip
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* @parent_handler: the parent interrupt handler for the accumulated IRQ
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* coming out of the gpiochip. If the interrupt is nested rather than
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* cascaded, pass NULL in this handler argument
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*/
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void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
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struct irq_chip *irqchip,
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int parent_irq,
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irq_flow_handler_t parent_handler)
|
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{
|
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unsigned int offset;
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|
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if (!gpiochip->irqdomain) {
|
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chip_err(gpiochip, "called %s before setting up irqchip\n",
|
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__func__);
|
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return;
|
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}
|
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|
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if (parent_handler) {
|
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if (gpiochip->can_sleep) {
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chip_err(gpiochip,
|
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"you cannot have chained interrupts on a "
|
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"chip that may sleep\n");
|
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return;
|
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}
|
|
/*
|
|
* The parent irqchip is already using the chip_data for this
|
|
* irqchip, so our callbacks simply use the handler_data.
|
|
*/
|
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irq_set_chained_handler_and_data(parent_irq, parent_handler,
|
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gpiochip);
|
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|
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gpiochip->irq_parent = parent_irq;
|
|
}
|
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|
|
/* Set the parent IRQ for all affected IRQs */
|
|
for (offset = 0; offset < gpiochip->ngpio; offset++)
|
|
irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset),
|
|
parent_irq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip);
|
|
|
|
/**
|
|
* gpiochip_irq_map() - maps an IRQ into a GPIO irqchip
|
|
* @d: the irqdomain used by this irqchip
|
|
* @irq: the global irq number used by this GPIO irqchip irq
|
|
* @hwirq: the local IRQ/GPIO line offset on this gpiochip
|
|
*
|
|
* This function will set up the mapping for a certain IRQ line on a
|
|
* gpiochip by assigning the gpiochip as chip data, and using the irqchip
|
|
* stored inside the gpiochip.
|
|
*/
|
|
static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
struct gpio_chip *chip = d->host_data;
|
|
|
|
irq_set_chip_data(irq, chip);
|
|
/*
|
|
* This lock class tells lockdep that GPIO irqs are in a different
|
|
* category than their parents, so it won't report false recursion.
|
|
*/
|
|
irq_set_lockdep_class(irq, chip->lock_key);
|
|
irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler);
|
|
/* Chips that can sleep need nested thread handlers */
|
|
if (chip->can_sleep && !chip->irq_not_threaded)
|
|
irq_set_nested_thread(irq, 1);
|
|
irq_set_noprobe(irq);
|
|
|
|
/*
|
|
* No set-up of the hardware will happen if IRQ_TYPE_NONE
|
|
* is passed as default type.
|
|
*/
|
|
if (chip->irq_default_type != IRQ_TYPE_NONE)
|
|
irq_set_irq_type(irq, chip->irq_default_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
|
|
{
|
|
struct gpio_chip *chip = d->host_data;
|
|
|
|
if (chip->can_sleep)
|
|
irq_set_nested_thread(irq, 0);
|
|
irq_set_chip_and_handler(irq, NULL, NULL);
|
|
irq_set_chip_data(irq, NULL);
|
|
}
|
|
|
|
static const struct irq_domain_ops gpiochip_domain_ops = {
|
|
.map = gpiochip_irq_map,
|
|
.unmap = gpiochip_irq_unmap,
|
|
/* Virtually all GPIO irqchips are twocell:ed */
|
|
.xlate = irq_domain_xlate_twocell,
|
|
};
|
|
|
|
static int gpiochip_irq_reqres(struct irq_data *d)
|
|
{
|
|
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
|
|
|
|
if (!try_module_get(chip->owner))
|
|
return -ENODEV;
|
|
|
|
if (gpiochip_lock_as_irq(chip, d->hwirq)) {
|
|
chip_err(chip,
|
|
"unable to lock HW IRQ %lu for IRQ\n",
|
|
d->hwirq);
|
|
module_put(chip->owner);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void gpiochip_irq_relres(struct irq_data *d)
|
|
{
|
|
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
|
|
|
|
gpiochip_unlock_as_irq(chip, d->hwirq);
|
|
module_put(chip->owner);
|
|
}
|
|
|
|
static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
return irq_find_mapping(chip->irqdomain, offset);
|
|
}
|
|
|
|
/**
|
|
* gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip
|
|
* @gpiochip: the gpiochip to remove the irqchip from
|
|
*
|
|
* This is called only from gpiochip_remove()
|
|
*/
|
|
static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
|
|
{
|
|
unsigned int offset;
|
|
|
|
acpi_gpiochip_free_interrupts(gpiochip);
|
|
|
|
if (gpiochip->irq_parent) {
|
|
irq_set_chained_handler(gpiochip->irq_parent, NULL);
|
|
irq_set_handler_data(gpiochip->irq_parent, NULL);
|
|
}
|
|
|
|
/* Remove all IRQ mappings and delete the domain */
|
|
if (gpiochip->irqdomain) {
|
|
for (offset = 0; offset < gpiochip->ngpio; offset++)
|
|
irq_dispose_mapping(
|
|
irq_find_mapping(gpiochip->irqdomain, offset));
|
|
irq_domain_remove(gpiochip->irqdomain);
|
|
}
|
|
|
|
if (gpiochip->irqchip) {
|
|
gpiochip->irqchip->irq_request_resources = NULL;
|
|
gpiochip->irqchip->irq_release_resources = NULL;
|
|
gpiochip->irqchip = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gpiochip_irqchip_add() - adds an irqchip to a gpiochip
|
|
* @gpiochip: the gpiochip to add the irqchip to
|
|
* @irqchip: the irqchip to add to the gpiochip
|
|
* @first_irq: if not dynamically assigned, the base (first) IRQ to
|
|
* allocate gpiochip irqs from
|
|
* @handler: the irq handler to use (often a predefined irq core function)
|
|
* @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE
|
|
* to have the core avoid setting up any default type in the hardware.
|
|
* @lock_key: lockdep class
|
|
*
|
|
* This function closely associates a certain irqchip with a certain
|
|
* gpiochip, providing an irq domain to translate the local IRQs to
|
|
* global irqs in the gpiolib core, and making sure that the gpiochip
|
|
* is passed as chip data to all related functions. Driver callbacks
|
|
* need to use container_of() to get their local state containers back
|
|
* from the gpiochip passed as chip data. An irqdomain will be stored
|
|
* in the gpiochip that shall be used by the driver to handle IRQ number
|
|
* translation. The gpiochip will need to be initialized and registered
|
|
* before calling this function.
|
|
*
|
|
* This function will handle two cell:ed simple IRQs and assumes all
|
|
* the pins on the gpiochip can generate a unique IRQ. Everything else
|
|
* need to be open coded.
|
|
*/
|
|
int _gpiochip_irqchip_add(struct gpio_chip *gpiochip,
|
|
struct irq_chip *irqchip,
|
|
unsigned int first_irq,
|
|
irq_flow_handler_t handler,
|
|
unsigned int type,
|
|
struct lock_class_key *lock_key)
|
|
{
|
|
struct device_node *of_node;
|
|
unsigned int offset;
|
|
unsigned irq_base = 0;
|
|
|
|
if (!gpiochip || !irqchip)
|
|
return -EINVAL;
|
|
|
|
if (!gpiochip->parent) {
|
|
pr_err("missing gpiochip .dev parent pointer\n");
|
|
return -EINVAL;
|
|
}
|
|
of_node = gpiochip->parent->of_node;
|
|
#ifdef CONFIG_OF_GPIO
|
|
/*
|
|
* If the gpiochip has an assigned OF node this takes precedence
|
|
* FIXME: get rid of this and use gpiochip->parent->of_node
|
|
* everywhere
|
|
*/
|
|
if (gpiochip->of_node)
|
|
of_node = gpiochip->of_node;
|
|
#endif
|
|
gpiochip->irqchip = irqchip;
|
|
gpiochip->irq_handler = handler;
|
|
gpiochip->irq_default_type = type;
|
|
gpiochip->to_irq = gpiochip_to_irq;
|
|
gpiochip->lock_key = lock_key;
|
|
gpiochip->irqdomain = irq_domain_add_simple(of_node,
|
|
gpiochip->ngpio, first_irq,
|
|
&gpiochip_domain_ops, gpiochip);
|
|
if (!gpiochip->irqdomain) {
|
|
gpiochip->irqchip = NULL;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* It is possible for a driver to override this, but only if the
|
|
* alternative functions are both implemented.
|
|
*/
|
|
if (!irqchip->irq_request_resources &&
|
|
!irqchip->irq_release_resources) {
|
|
irqchip->irq_request_resources = gpiochip_irq_reqres;
|
|
irqchip->irq_release_resources = gpiochip_irq_relres;
|
|
}
|
|
|
|
/*
|
|
* Prepare the mapping since the irqchip shall be orthogonal to
|
|
* any gpiochip calls. If the first_irq was zero, this is
|
|
* necessary to allocate descriptors for all IRQs.
|
|
*/
|
|
for (offset = 0; offset < gpiochip->ngpio; offset++) {
|
|
irq_base = irq_create_mapping(gpiochip->irqdomain, offset);
|
|
if (offset == 0)
|
|
/*
|
|
* Store the base into the gpiochip to be used when
|
|
* unmapping the irqs.
|
|
*/
|
|
gpiochip->irq_base = irq_base;
|
|
}
|
|
|
|
acpi_gpiochip_request_interrupts(gpiochip);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add);
|
|
|
|
#else /* CONFIG_GPIOLIB_IRQCHIP */
|
|
|
|
static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {}
|
|
|
|
#endif /* CONFIG_GPIOLIB_IRQCHIP */
|
|
|
|
/**
|
|
* gpiochip_generic_request() - request the gpio function for a pin
|
|
* @chip: the gpiochip owning the GPIO
|
|
* @offset: the offset of the GPIO to request for GPIO function
|
|
*/
|
|
int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
return pinctrl_request_gpio(chip->base + offset);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_generic_request);
|
|
|
|
/**
|
|
* gpiochip_generic_free() - free the gpio function from a pin
|
|
* @chip: the gpiochip to request the gpio function for
|
|
* @offset: the offset of the GPIO to free from GPIO function
|
|
*/
|
|
void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
pinctrl_free_gpio(chip->base + offset);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_generic_free);
|
|
|
|
#ifdef CONFIG_PINCTRL
|
|
|
|
/**
|
|
* gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping
|
|
* @chip: the gpiochip to add the range for
|
|
* @pctldev: the pin controller to map to
|
|
* @gpio_offset: the start offset in the current gpio_chip number space
|
|
* @pin_group: name of the pin group inside the pin controller
|
|
*/
|
|
int gpiochip_add_pingroup_range(struct gpio_chip *chip,
|
|
struct pinctrl_dev *pctldev,
|
|
unsigned int gpio_offset, const char *pin_group)
|
|
{
|
|
struct gpio_pin_range *pin_range;
|
|
int ret;
|
|
|
|
pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
|
|
if (!pin_range) {
|
|
chip_err(chip, "failed to allocate pin ranges\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Use local offset as range ID */
|
|
pin_range->range.id = gpio_offset;
|
|
pin_range->range.gc = chip;
|
|
pin_range->range.name = chip->label;
|
|
pin_range->range.base = chip->base + gpio_offset;
|
|
pin_range->pctldev = pctldev;
|
|
|
|
ret = pinctrl_get_group_pins(pctldev, pin_group,
|
|
&pin_range->range.pins,
|
|
&pin_range->range.npins);
|
|
if (ret < 0) {
|
|
kfree(pin_range);
|
|
return ret;
|
|
}
|
|
|
|
pinctrl_add_gpio_range(pctldev, &pin_range->range);
|
|
|
|
chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n",
|
|
gpio_offset, gpio_offset + pin_range->range.npins - 1,
|
|
pinctrl_dev_get_devname(pctldev), pin_group);
|
|
|
|
list_add_tail(&pin_range->node, &chip->pin_ranges);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range);
|
|
|
|
/**
|
|
* gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping
|
|
* @chip: the gpiochip to add the range for
|
|
* @pinctrl_name: the dev_name() of the pin controller to map to
|
|
* @gpio_offset: the start offset in the current gpio_chip number space
|
|
* @pin_offset: the start offset in the pin controller number space
|
|
* @npins: the number of pins from the offset of each pin space (GPIO and
|
|
* pin controller) to accumulate in this range
|
|
*/
|
|
int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
|
|
unsigned int gpio_offset, unsigned int pin_offset,
|
|
unsigned int npins)
|
|
{
|
|
struct gpio_pin_range *pin_range;
|
|
int ret;
|
|
|
|
pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
|
|
if (!pin_range) {
|
|
chip_err(chip, "failed to allocate pin ranges\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Use local offset as range ID */
|
|
pin_range->range.id = gpio_offset;
|
|
pin_range->range.gc = chip;
|
|
pin_range->range.name = chip->label;
|
|
pin_range->range.base = chip->base + gpio_offset;
|
|
pin_range->range.pin_base = pin_offset;
|
|
pin_range->range.npins = npins;
|
|
pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name,
|
|
&pin_range->range);
|
|
if (IS_ERR(pin_range->pctldev)) {
|
|
ret = PTR_ERR(pin_range->pctldev);
|
|
chip_err(chip, "could not create pin range\n");
|
|
kfree(pin_range);
|
|
return ret;
|
|
}
|
|
chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n",
|
|
gpio_offset, gpio_offset + npins - 1,
|
|
pinctl_name,
|
|
pin_offset, pin_offset + npins - 1);
|
|
|
|
list_add_tail(&pin_range->node, &chip->pin_ranges);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_add_pin_range);
|
|
|
|
/**
|
|
* gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings
|
|
* @chip: the chip to remove all the mappings for
|
|
*/
|
|
void gpiochip_remove_pin_ranges(struct gpio_chip *chip)
|
|
{
|
|
struct gpio_pin_range *pin_range, *tmp;
|
|
|
|
list_for_each_entry_safe(pin_range, tmp, &chip->pin_ranges, node) {
|
|
list_del(&pin_range->node);
|
|
pinctrl_remove_gpio_range(pin_range->pctldev,
|
|
&pin_range->range);
|
|
kfree(pin_range);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges);
|
|
|
|
#endif /* CONFIG_PINCTRL */
|
|
|
|
/* These "optional" allocation calls help prevent drivers from stomping
|
|
* on each other, and help provide better diagnostics in debugfs.
|
|
* They're called even less than the "set direction" calls.
|
|
*/
|
|
static int __gpiod_request(struct gpio_desc *desc, const char *label)
|
|
{
|
|
struct gpio_chip *chip = desc->chip;
|
|
int status;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&gpio_lock, flags);
|
|
|
|
/* NOTE: gpio_request() can be called in early boot,
|
|
* before IRQs are enabled, for non-sleeping (SOC) GPIOs.
|
|
*/
|
|
|
|
if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) {
|
|
desc_set_label(desc, label ? : "?");
|
|
status = 0;
|
|
} else {
|
|
status = -EBUSY;
|
|
goto done;
|
|
}
|
|
|
|
if (chip->request) {
|
|
/* chip->request may sleep */
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
status = chip->request(chip, gpio_chip_hwgpio(desc));
|
|
spin_lock_irqsave(&gpio_lock, flags);
|
|
|
|
if (status < 0) {
|
|
desc_set_label(desc, NULL);
|
|
clear_bit(FLAG_REQUESTED, &desc->flags);
|
|
goto done;
|
|
}
|
|
}
|
|
if (chip->get_direction) {
|
|
/* chip->get_direction may sleep */
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
gpiod_get_direction(desc);
|
|
spin_lock_irqsave(&gpio_lock, flags);
|
|
}
|
|
done:
|
|
if (status < 0) {
|
|
/* Clear flags that might have been set by the caller before
|
|
* requesting the GPIO.
|
|
*/
|
|
clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
|
|
clear_bit(FLAG_OPEN_DRAIN, &desc->flags);
|
|
clear_bit(FLAG_OPEN_SOURCE, &desc->flags);
|
|
}
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
return status;
|
|
}
|
|
|
|
int gpiod_request(struct gpio_desc *desc, const char *label)
|
|
{
|
|
int status = -EPROBE_DEFER;
|
|
struct gpio_chip *chip;
|
|
|
|
if (!desc) {
|
|
pr_warn("%s: invalid GPIO\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
chip = desc->chip;
|
|
if (!chip)
|
|
goto done;
|
|
|
|
if (try_module_get(chip->owner)) {
|
|
status = __gpiod_request(desc, label);
|
|
if (status < 0)
|
|
module_put(chip->owner);
|
|
}
|
|
|
|
done:
|
|
if (status)
|
|
gpiod_dbg(desc, "%s: status %d\n", __func__, status);
|
|
|
|
return status;
|
|
}
|
|
|
|
static bool __gpiod_free(struct gpio_desc *desc)
|
|
{
|
|
bool ret = false;
|
|
unsigned long flags;
|
|
struct gpio_chip *chip;
|
|
|
|
might_sleep();
|
|
|
|
gpiod_unexport(desc);
|
|
|
|
spin_lock_irqsave(&gpio_lock, flags);
|
|
|
|
chip = desc->chip;
|
|
if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) {
|
|
if (chip->free) {
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
might_sleep_if(chip->can_sleep);
|
|
chip->free(chip, gpio_chip_hwgpio(desc));
|
|
spin_lock_irqsave(&gpio_lock, flags);
|
|
}
|
|
desc_set_label(desc, NULL);
|
|
clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
|
|
clear_bit(FLAG_REQUESTED, &desc->flags);
|
|
clear_bit(FLAG_OPEN_DRAIN, &desc->flags);
|
|
clear_bit(FLAG_OPEN_SOURCE, &desc->flags);
|
|
clear_bit(FLAG_IS_HOGGED, &desc->flags);
|
|
ret = true;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
void gpiod_free(struct gpio_desc *desc)
|
|
{
|
|
if (desc && __gpiod_free(desc))
|
|
module_put(desc->chip->owner);
|
|
else
|
|
WARN_ON(extra_checks);
|
|
}
|
|
|
|
/**
|
|
* gpiochip_is_requested - return string iff signal was requested
|
|
* @chip: controller managing the signal
|
|
* @offset: of signal within controller's 0..(ngpio - 1) range
|
|
*
|
|
* Returns NULL if the GPIO is not currently requested, else a string.
|
|
* The string returned is the label passed to gpio_request(); if none has been
|
|
* passed it is a meaningless, non-NULL constant.
|
|
*
|
|
* This function is for use by GPIO controller drivers. The label can
|
|
* help with diagnostics, and knowing that the signal is used as a GPIO
|
|
* can help avoid accidentally multiplexing it to another controller.
|
|
*/
|
|
const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct gpio_desc *desc;
|
|
|
|
if (offset >= chip->ngpio)
|
|
return NULL;
|
|
|
|
desc = &chip->desc[offset];
|
|
|
|
if (test_bit(FLAG_REQUESTED, &desc->flags) == 0)
|
|
return NULL;
|
|
return desc->label;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_is_requested);
|
|
|
|
/**
|
|
* gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor
|
|
* @desc: GPIO descriptor to request
|
|
* @label: label for the GPIO
|
|
*
|
|
* Function allows GPIO chip drivers to request and use their own GPIO
|
|
* descriptors via gpiolib API. Difference to gpiod_request() is that this
|
|
* function will not increase reference count of the GPIO chip module. This
|
|
* allows the GPIO chip module to be unloaded as needed (we assume that the
|
|
* GPIO chip driver handles freeing the GPIOs it has requested).
|
|
*/
|
|
struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
|
|
const char *label)
|
|
{
|
|
struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum);
|
|
int err;
|
|
|
|
if (IS_ERR(desc)) {
|
|
chip_err(chip, "failed to get GPIO descriptor\n");
|
|
return desc;
|
|
}
|
|
|
|
err = __gpiod_request(desc, label);
|
|
if (err < 0)
|
|
return ERR_PTR(err);
|
|
|
|
return desc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_request_own_desc);
|
|
|
|
/**
|
|
* gpiochip_free_own_desc - Free GPIO requested by the chip driver
|
|
* @desc: GPIO descriptor to free
|
|
*
|
|
* Function frees the given GPIO requested previously with
|
|
* gpiochip_request_own_desc().
|
|
*/
|
|
void gpiochip_free_own_desc(struct gpio_desc *desc)
|
|
{
|
|
if (desc)
|
|
__gpiod_free(desc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);
|
|
|
|
/* Drivers MUST set GPIO direction before making get/set calls. In
|
|
* some cases this is done in early boot, before IRQs are enabled.
|
|
*
|
|
* As a rule these aren't called more than once (except for drivers
|
|
* using the open-drain emulation idiom) so these are natural places
|
|
* to accumulate extra debugging checks. Note that we can't (yet)
|
|
* rely on gpio_request() having been called beforehand.
|
|
*/
|
|
|
|
/**
|
|
* gpiod_direction_input - set the GPIO direction to input
|
|
* @desc: GPIO to set to input
|
|
*
|
|
* Set the direction of the passed GPIO to input, such as gpiod_get_value() can
|
|
* be called safely on it.
|
|
*
|
|
* Return 0 in case of success, else an error code.
|
|
*/
|
|
int gpiod_direction_input(struct gpio_desc *desc)
|
|
{
|
|
struct gpio_chip *chip;
|
|
int status = -EINVAL;
|
|
|
|
if (!desc || !desc->chip) {
|
|
pr_warn("%s: invalid GPIO\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
chip = desc->chip;
|
|
if (!chip->get || !chip->direction_input) {
|
|
gpiod_warn(desc,
|
|
"%s: missing get() or direction_input() operations\n",
|
|
__func__);
|
|
return -EIO;
|
|
}
|
|
|
|
status = chip->direction_input(chip, gpio_chip_hwgpio(desc));
|
|
if (status == 0)
|
|
clear_bit(FLAG_IS_OUT, &desc->flags);
|
|
|
|
trace_gpio_direction(desc_to_gpio(desc), 1, status);
|
|
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_direction_input);
|
|
|
|
static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
|
|
{
|
|
struct gpio_chip *chip;
|
|
int status = -EINVAL;
|
|
|
|
/* GPIOs used for IRQs shall not be set as output */
|
|
if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
|
|
gpiod_err(desc,
|
|
"%s: tried to set a GPIO tied to an IRQ as output\n",
|
|
__func__);
|
|
return -EIO;
|
|
}
|
|
|
|
/* Open drain pin should not be driven to 1 */
|
|
if (value && test_bit(FLAG_OPEN_DRAIN, &desc->flags))
|
|
return gpiod_direction_input(desc);
|
|
|
|
/* Open source pin should not be driven to 0 */
|
|
if (!value && test_bit(FLAG_OPEN_SOURCE, &desc->flags))
|
|
return gpiod_direction_input(desc);
|
|
|
|
chip = desc->chip;
|
|
if (!chip->set || !chip->direction_output) {
|
|
gpiod_warn(desc,
|
|
"%s: missing set() or direction_output() operations\n",
|
|
__func__);
|
|
return -EIO;
|
|
}
|
|
|
|
status = chip->direction_output(chip, gpio_chip_hwgpio(desc), value);
|
|
if (status == 0)
|
|
set_bit(FLAG_IS_OUT, &desc->flags);
|
|
trace_gpio_value(desc_to_gpio(desc), 0, value);
|
|
trace_gpio_direction(desc_to_gpio(desc), 0, status);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* gpiod_direction_output_raw - set the GPIO direction to output
|
|
* @desc: GPIO to set to output
|
|
* @value: initial output value of the GPIO
|
|
*
|
|
* Set the direction of the passed GPIO to output, such as gpiod_set_value() can
|
|
* be called safely on it. The initial value of the output must be specified
|
|
* as raw value on the physical line without regard for the ACTIVE_LOW status.
|
|
*
|
|
* Return 0 in case of success, else an error code.
|
|
*/
|
|
int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
|
|
{
|
|
if (!desc || !desc->chip) {
|
|
pr_warn("%s: invalid GPIO\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
return _gpiod_direction_output_raw(desc, value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
|
|
|
|
/**
|
|
* gpiod_direction_output - set the GPIO direction to output
|
|
* @desc: GPIO to set to output
|
|
* @value: initial output value of the GPIO
|
|
*
|
|
* Set the direction of the passed GPIO to output, such as gpiod_set_value() can
|
|
* be called safely on it. The initial value of the output must be specified
|
|
* as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
|
|
* account.
|
|
*
|
|
* Return 0 in case of success, else an error code.
|
|
*/
|
|
int gpiod_direction_output(struct gpio_desc *desc, int value)
|
|
{
|
|
if (!desc || !desc->chip) {
|
|
pr_warn("%s: invalid GPIO\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
|
|
value = !value;
|
|
return _gpiod_direction_output_raw(desc, value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_direction_output);
|
|
|
|
/**
|
|
* gpiod_set_debounce - sets @debounce time for a @gpio
|
|
* @gpio: the gpio to set debounce time
|
|
* @debounce: debounce time is microseconds
|
|
*
|
|
* returns -ENOTSUPP if the controller does not support setting
|
|
* debounce.
|
|
*/
|
|
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
|
|
{
|
|
struct gpio_chip *chip;
|
|
|
|
if (!desc || !desc->chip) {
|
|
pr_warn("%s: invalid GPIO\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
chip = desc->chip;
|
|
if (!chip->set || !chip->set_debounce) {
|
|
gpiod_dbg(desc,
|
|
"%s: missing set() or set_debounce() operations\n",
|
|
__func__);
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_debounce);
|
|
|
|
/**
|
|
* gpiod_is_active_low - test whether a GPIO is active-low or not
|
|
* @desc: the gpio descriptor to test
|
|
*
|
|
* Returns 1 if the GPIO is active-low, 0 otherwise.
|
|
*/
|
|
int gpiod_is_active_low(const struct gpio_desc *desc)
|
|
{
|
|
return test_bit(FLAG_ACTIVE_LOW, &desc->flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_is_active_low);
|
|
|
|
/* I/O calls are only valid after configuration completed; the relevant
|
|
* "is this a valid GPIO" error checks should already have been done.
|
|
*
|
|
* "Get" operations are often inlinable as reading a pin value register,
|
|
* and masking the relevant bit in that register.
|
|
*
|
|
* When "set" operations are inlinable, they involve writing that mask to
|
|
* one register to set a low value, or a different register to set it high.
|
|
* Otherwise locking is needed, so there may be little value to inlining.
|
|
*
|
|
*------------------------------------------------------------------------
|
|
*
|
|
* IMPORTANT!!! The hot paths -- get/set value -- assume that callers
|
|
* have requested the GPIO. That can include implicit requesting by
|
|
* a direction setting call. Marking a gpio as requested locks its chip
|
|
* in memory, guaranteeing that these table lookups need no more locking
|
|
* and that gpiochip_remove() will fail.
|
|
*
|
|
* REVISIT when debugging, consider adding some instrumentation to ensure
|
|
* that the GPIO was actually requested.
|
|
*/
|
|
|
|
static int _gpiod_get_raw_value(const struct gpio_desc *desc)
|
|
{
|
|
struct gpio_chip *chip;
|
|
int offset;
|
|
int value;
|
|
|
|
chip = desc->chip;
|
|
offset = gpio_chip_hwgpio(desc);
|
|
value = chip->get ? chip->get(chip, offset) : -EIO;
|
|
value = value < 0 ? value : !!value;
|
|
trace_gpio_value(desc_to_gpio(desc), 1, value);
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* gpiod_get_raw_value() - return a gpio's raw value
|
|
* @desc: gpio whose value will be returned
|
|
*
|
|
* Return the GPIO's raw value, i.e. the value of the physical line disregarding
|
|
* its ACTIVE_LOW status, or negative errno on failure.
|
|
*
|
|
* This function should be called from contexts where we cannot sleep, and will
|
|
* complain if the GPIO chip functions potentially sleep.
|
|
*/
|
|
int gpiod_get_raw_value(const struct gpio_desc *desc)
|
|
{
|
|
if (!desc)
|
|
return 0;
|
|
/* Should be using gpio_get_value_cansleep() */
|
|
WARN_ON(desc->chip->can_sleep);
|
|
return _gpiod_get_raw_value(desc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_raw_value);
|
|
|
|
/**
|
|
* gpiod_get_value() - return a gpio's value
|
|
* @desc: gpio whose value will be returned
|
|
*
|
|
* Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into
|
|
* account, or negative errno on failure.
|
|
*
|
|
* This function should be called from contexts where we cannot sleep, and will
|
|
* complain if the GPIO chip functions potentially sleep.
|
|
*/
|
|
int gpiod_get_value(const struct gpio_desc *desc)
|
|
{
|
|
int value;
|
|
if (!desc)
|
|
return 0;
|
|
/* Should be using gpio_get_value_cansleep() */
|
|
WARN_ON(desc->chip->can_sleep);
|
|
|
|
value = _gpiod_get_raw_value(desc);
|
|
if (value < 0)
|
|
return value;
|
|
|
|
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
|
|
value = !value;
|
|
|
|
return value;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_value);
|
|
|
|
/*
|
|
* _gpio_set_open_drain_value() - Set the open drain gpio's value.
|
|
* @desc: gpio descriptor whose state need to be set.
|
|
* @value: Non-zero for setting it HIGH otherwise it will set to LOW.
|
|
*/
|
|
static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value)
|
|
{
|
|
int err = 0;
|
|
struct gpio_chip *chip = desc->chip;
|
|
int offset = gpio_chip_hwgpio(desc);
|
|
|
|
if (value) {
|
|
err = chip->direction_input(chip, offset);
|
|
if (!err)
|
|
clear_bit(FLAG_IS_OUT, &desc->flags);
|
|
} else {
|
|
err = chip->direction_output(chip, offset, 0);
|
|
if (!err)
|
|
set_bit(FLAG_IS_OUT, &desc->flags);
|
|
}
|
|
trace_gpio_direction(desc_to_gpio(desc), value, err);
|
|
if (err < 0)
|
|
gpiod_err(desc,
|
|
"%s: Error in set_value for open drain err %d\n",
|
|
__func__, err);
|
|
}
|
|
|
|
/*
|
|
* _gpio_set_open_source_value() - Set the open source gpio's value.
|
|
* @desc: gpio descriptor whose state need to be set.
|
|
* @value: Non-zero for setting it HIGH otherwise it will set to LOW.
|
|
*/
|
|
static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value)
|
|
{
|
|
int err = 0;
|
|
struct gpio_chip *chip = desc->chip;
|
|
int offset = gpio_chip_hwgpio(desc);
|
|
|
|
if (value) {
|
|
err = chip->direction_output(chip, offset, 1);
|
|
if (!err)
|
|
set_bit(FLAG_IS_OUT, &desc->flags);
|
|
} else {
|
|
err = chip->direction_input(chip, offset);
|
|
if (!err)
|
|
clear_bit(FLAG_IS_OUT, &desc->flags);
|
|
}
|
|
trace_gpio_direction(desc_to_gpio(desc), !value, err);
|
|
if (err < 0)
|
|
gpiod_err(desc,
|
|
"%s: Error in set_value for open source err %d\n",
|
|
__func__, err);
|
|
}
|
|
|
|
static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value)
|
|
{
|
|
struct gpio_chip *chip;
|
|
|
|
chip = desc->chip;
|
|
trace_gpio_value(desc_to_gpio(desc), 0, value);
|
|
if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
|
|
_gpio_set_open_drain_value(desc, value);
|
|
else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
|
|
_gpio_set_open_source_value(desc, value);
|
|
else
|
|
chip->set(chip, gpio_chip_hwgpio(desc), value);
|
|
}
|
|
|
|
/*
|
|
* set multiple outputs on the same chip;
|
|
* use the chip's set_multiple function if available;
|
|
* otherwise set the outputs sequentially;
|
|
* @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word
|
|
* defines which outputs are to be changed
|
|
* @bits: bit value array; one bit per output; BITS_PER_LONG bits per word
|
|
* defines the values the outputs specified by mask are to be set to
|
|
*/
|
|
static void gpio_chip_set_multiple(struct gpio_chip *chip,
|
|
unsigned long *mask, unsigned long *bits)
|
|
{
|
|
if (chip->set_multiple) {
|
|
chip->set_multiple(chip, mask, bits);
|
|
} else {
|
|
int i;
|
|
for (i = 0; i < chip->ngpio; i++) {
|
|
if (mask[BIT_WORD(i)] == 0) {
|
|
/* no more set bits in this mask word;
|
|
* skip ahead to the next word */
|
|
i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1;
|
|
continue;
|
|
}
|
|
/* set outputs if the corresponding mask bit is set */
|
|
if (__test_and_clear_bit(i, mask))
|
|
chip->set(chip, i, test_bit(i, bits));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void gpiod_set_array_value_priv(bool raw, bool can_sleep,
|
|
unsigned int array_size,
|
|
struct gpio_desc **desc_array,
|
|
int *value_array)
|
|
{
|
|
int i = 0;
|
|
|
|
while (i < array_size) {
|
|
struct gpio_chip *chip = desc_array[i]->chip;
|
|
unsigned long mask[BITS_TO_LONGS(chip->ngpio)];
|
|
unsigned long bits[BITS_TO_LONGS(chip->ngpio)];
|
|
int count = 0;
|
|
|
|
if (!can_sleep)
|
|
WARN_ON(chip->can_sleep);
|
|
|
|
memset(mask, 0, sizeof(mask));
|
|
do {
|
|
struct gpio_desc *desc = desc_array[i];
|
|
int hwgpio = gpio_chip_hwgpio(desc);
|
|
int value = value_array[i];
|
|
|
|
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
|
|
value = !value;
|
|
trace_gpio_value(desc_to_gpio(desc), 0, value);
|
|
/*
|
|
* collect all normal outputs belonging to the same chip
|
|
* open drain and open source outputs are set individually
|
|
*/
|
|
if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
|
|
_gpio_set_open_drain_value(desc, value);
|
|
} else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
|
|
_gpio_set_open_source_value(desc, value);
|
|
} else {
|
|
__set_bit(hwgpio, mask);
|
|
if (value)
|
|
__set_bit(hwgpio, bits);
|
|
else
|
|
__clear_bit(hwgpio, bits);
|
|
count++;
|
|
}
|
|
i++;
|
|
} while ((i < array_size) && (desc_array[i]->chip == chip));
|
|
/* push collected bits to outputs */
|
|
if (count != 0)
|
|
gpio_chip_set_multiple(chip, mask, bits);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gpiod_set_raw_value() - assign a gpio's raw value
|
|
* @desc: gpio whose value will be assigned
|
|
* @value: value to assign
|
|
*
|
|
* Set the raw value of the GPIO, i.e. the value of its physical line without
|
|
* regard for its ACTIVE_LOW status.
|
|
*
|
|
* This function should be called from contexts where we cannot sleep, and will
|
|
* complain if the GPIO chip functions potentially sleep.
|
|
*/
|
|
void gpiod_set_raw_value(struct gpio_desc *desc, int value)
|
|
{
|
|
if (!desc)
|
|
return;
|
|
/* Should be using gpio_set_value_cansleep() */
|
|
WARN_ON(desc->chip->can_sleep);
|
|
_gpiod_set_raw_value(desc, value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
|
|
|
|
/**
|
|
* gpiod_set_value() - assign a gpio's value
|
|
* @desc: gpio whose value will be assigned
|
|
* @value: value to assign
|
|
*
|
|
* Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
|
|
* account
|
|
*
|
|
* This function should be called from contexts where we cannot sleep, and will
|
|
* complain if the GPIO chip functions potentially sleep.
|
|
*/
|
|
void gpiod_set_value(struct gpio_desc *desc, int value)
|
|
{
|
|
if (!desc)
|
|
return;
|
|
/* Should be using gpio_set_value_cansleep() */
|
|
WARN_ON(desc->chip->can_sleep);
|
|
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
|
|
value = !value;
|
|
_gpiod_set_raw_value(desc, value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_value);
|
|
|
|
/**
|
|
* gpiod_set_raw_array_value() - assign values to an array of GPIOs
|
|
* @array_size: number of elements in the descriptor / value arrays
|
|
* @desc_array: array of GPIO descriptors whose values will be assigned
|
|
* @value_array: array of values to assign
|
|
*
|
|
* Set the raw values of the GPIOs, i.e. the values of the physical lines
|
|
* without regard for their ACTIVE_LOW status.
|
|
*
|
|
* This function should be called from contexts where we cannot sleep, and will
|
|
* complain if the GPIO chip functions potentially sleep.
|
|
*/
|
|
void gpiod_set_raw_array_value(unsigned int array_size,
|
|
struct gpio_desc **desc_array, int *value_array)
|
|
{
|
|
if (!desc_array)
|
|
return;
|
|
gpiod_set_array_value_priv(true, false, array_size, desc_array,
|
|
value_array);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
|
|
|
|
/**
|
|
* gpiod_set_array_value() - assign values to an array of GPIOs
|
|
* @array_size: number of elements in the descriptor / value arrays
|
|
* @desc_array: array of GPIO descriptors whose values will be assigned
|
|
* @value_array: array of values to assign
|
|
*
|
|
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
|
|
* into account.
|
|
*
|
|
* This function should be called from contexts where we cannot sleep, and will
|
|
* complain if the GPIO chip functions potentially sleep.
|
|
*/
|
|
void gpiod_set_array_value(unsigned int array_size,
|
|
struct gpio_desc **desc_array, int *value_array)
|
|
{
|
|
if (!desc_array)
|
|
return;
|
|
gpiod_set_array_value_priv(false, false, array_size, desc_array,
|
|
value_array);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
|
|
|
|
/**
|
|
* gpiod_cansleep() - report whether gpio value access may sleep
|
|
* @desc: gpio to check
|
|
*
|
|
*/
|
|
int gpiod_cansleep(const struct gpio_desc *desc)
|
|
{
|
|
if (!desc)
|
|
return 0;
|
|
return desc->chip->can_sleep;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_cansleep);
|
|
|
|
/**
|
|
* gpiod_to_irq() - return the IRQ corresponding to a GPIO
|
|
* @desc: gpio whose IRQ will be returned (already requested)
|
|
*
|
|
* Return the IRQ corresponding to the passed GPIO, or an error code in case of
|
|
* error.
|
|
*/
|
|
int gpiod_to_irq(const struct gpio_desc *desc)
|
|
{
|
|
struct gpio_chip *chip;
|
|
int offset;
|
|
|
|
if (!desc)
|
|
return -EINVAL;
|
|
chip = desc->chip;
|
|
offset = gpio_chip_hwgpio(desc);
|
|
return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_to_irq);
|
|
|
|
/**
|
|
* gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ
|
|
* @chip: the chip the GPIO to lock belongs to
|
|
* @offset: the offset of the GPIO to lock as IRQ
|
|
*
|
|
* This is used directly by GPIO drivers that want to lock down
|
|
* a certain GPIO line to be used for IRQs.
|
|
*/
|
|
int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
|
|
{
|
|
if (offset >= chip->ngpio)
|
|
return -EINVAL;
|
|
|
|
if (test_bit(FLAG_IS_OUT, &chip->desc[offset].flags)) {
|
|
chip_err(chip,
|
|
"%s: tried to flag a GPIO set as output for IRQ\n",
|
|
__func__);
|
|
return -EIO;
|
|
}
|
|
|
|
set_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq);
|
|
|
|
/**
|
|
* gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ
|
|
* @chip: the chip the GPIO to lock belongs to
|
|
* @offset: the offset of the GPIO to lock as IRQ
|
|
*
|
|
* This is used directly by GPIO drivers that want to indicate
|
|
* that a certain GPIO is no longer used exclusively for IRQ.
|
|
*/
|
|
void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
|
|
{
|
|
if (offset >= chip->ngpio)
|
|
return;
|
|
|
|
clear_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq);
|
|
|
|
/**
|
|
* gpiod_get_raw_value_cansleep() - return a gpio's raw value
|
|
* @desc: gpio whose value will be returned
|
|
*
|
|
* Return the GPIO's raw value, i.e. the value of the physical line disregarding
|
|
* its ACTIVE_LOW status, or negative errno on failure.
|
|
*
|
|
* This function is to be called from contexts that can sleep.
|
|
*/
|
|
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
|
|
{
|
|
might_sleep_if(extra_checks);
|
|
if (!desc)
|
|
return 0;
|
|
return _gpiod_get_raw_value(desc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep);
|
|
|
|
/**
|
|
* gpiod_get_value_cansleep() - return a gpio's value
|
|
* @desc: gpio whose value will be returned
|
|
*
|
|
* Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into
|
|
* account, or negative errno on failure.
|
|
*
|
|
* This function is to be called from contexts that can sleep.
|
|
*/
|
|
int gpiod_get_value_cansleep(const struct gpio_desc *desc)
|
|
{
|
|
int value;
|
|
|
|
might_sleep_if(extra_checks);
|
|
if (!desc)
|
|
return 0;
|
|
|
|
value = _gpiod_get_raw_value(desc);
|
|
if (value < 0)
|
|
return value;
|
|
|
|
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
|
|
value = !value;
|
|
|
|
return value;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
|
|
|
|
/**
|
|
* gpiod_set_raw_value_cansleep() - assign a gpio's raw value
|
|
* @desc: gpio whose value will be assigned
|
|
* @value: value to assign
|
|
*
|
|
* Set the raw value of the GPIO, i.e. the value of its physical line without
|
|
* regard for its ACTIVE_LOW status.
|
|
*
|
|
* This function is to be called from contexts that can sleep.
|
|
*/
|
|
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
|
|
{
|
|
might_sleep_if(extra_checks);
|
|
if (!desc)
|
|
return;
|
|
_gpiod_set_raw_value(desc, value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep);
|
|
|
|
/**
|
|
* gpiod_set_value_cansleep() - assign a gpio's value
|
|
* @desc: gpio whose value will be assigned
|
|
* @value: value to assign
|
|
*
|
|
* Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
|
|
* account
|
|
*
|
|
* This function is to be called from contexts that can sleep.
|
|
*/
|
|
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
|
|
{
|
|
might_sleep_if(extra_checks);
|
|
if (!desc)
|
|
return;
|
|
|
|
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
|
|
value = !value;
|
|
_gpiod_set_raw_value(desc, value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
|
|
|
|
/**
|
|
* gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
|
|
* @array_size: number of elements in the descriptor / value arrays
|
|
* @desc_array: array of GPIO descriptors whose values will be assigned
|
|
* @value_array: array of values to assign
|
|
*
|
|
* Set the raw values of the GPIOs, i.e. the values of the physical lines
|
|
* without regard for their ACTIVE_LOW status.
|
|
*
|
|
* This function is to be called from contexts that can sleep.
|
|
*/
|
|
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
|
|
struct gpio_desc **desc_array,
|
|
int *value_array)
|
|
{
|
|
might_sleep_if(extra_checks);
|
|
if (!desc_array)
|
|
return;
|
|
gpiod_set_array_value_priv(true, true, array_size, desc_array,
|
|
value_array);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
|
|
|
|
/**
|
|
* gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
|
|
* @array_size: number of elements in the descriptor / value arrays
|
|
* @desc_array: array of GPIO descriptors whose values will be assigned
|
|
* @value_array: array of values to assign
|
|
*
|
|
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
|
|
* into account.
|
|
*
|
|
* This function is to be called from contexts that can sleep.
|
|
*/
|
|
void gpiod_set_array_value_cansleep(unsigned int array_size,
|
|
struct gpio_desc **desc_array,
|
|
int *value_array)
|
|
{
|
|
might_sleep_if(extra_checks);
|
|
if (!desc_array)
|
|
return;
|
|
gpiod_set_array_value_priv(false, true, array_size, desc_array,
|
|
value_array);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
|
|
|
|
/**
|
|
* gpiod_add_lookup_table() - register GPIO device consumers
|
|
* @table: table of consumers to register
|
|
*/
|
|
void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
|
|
{
|
|
mutex_lock(&gpio_lookup_lock);
|
|
|
|
list_add_tail(&table->list, &gpio_lookup_list);
|
|
|
|
mutex_unlock(&gpio_lookup_lock);
|
|
}
|
|
|
|
/**
|
|
* gpiod_remove_lookup_table() - unregister GPIO device consumers
|
|
* @table: table of consumers to unregister
|
|
*/
|
|
void gpiod_remove_lookup_table(struct gpiod_lookup_table *table)
|
|
{
|
|
mutex_lock(&gpio_lookup_lock);
|
|
|
|
list_del(&table->list);
|
|
|
|
mutex_unlock(&gpio_lookup_lock);
|
|
}
|
|
|
|
static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
|
|
unsigned int idx,
|
|
enum gpio_lookup_flags *flags)
|
|
{
|
|
char prop_name[32]; /* 32 is max size of property name */
|
|
enum of_gpio_flags of_flags;
|
|
struct gpio_desc *desc;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
|
|
if (con_id)
|
|
snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id,
|
|
gpio_suffixes[i]);
|
|
else
|
|
snprintf(prop_name, sizeof(prop_name), "%s",
|
|
gpio_suffixes[i]);
|
|
|
|
desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx,
|
|
&of_flags);
|
|
if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
|
|
break;
|
|
}
|
|
|
|
if (IS_ERR(desc))
|
|
return desc;
|
|
|
|
if (of_flags & OF_GPIO_ACTIVE_LOW)
|
|
*flags |= GPIO_ACTIVE_LOW;
|
|
|
|
if (of_flags & OF_GPIO_SINGLE_ENDED) {
|
|
if (of_flags & OF_GPIO_ACTIVE_LOW)
|
|
*flags |= GPIO_OPEN_DRAIN;
|
|
else
|
|
*flags |= GPIO_OPEN_SOURCE;
|
|
}
|
|
|
|
return desc;
|
|
}
|
|
|
|
static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id,
|
|
unsigned int idx,
|
|
enum gpio_lookup_flags *flags)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
struct acpi_gpio_info info;
|
|
struct gpio_desc *desc;
|
|
char propname[32];
|
|
int i;
|
|
|
|
/* Try first from _DSD */
|
|
for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
|
|
if (con_id && strcmp(con_id, "gpios")) {
|
|
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) || (PTR_ERR(desc) == -EPROBE_DEFER))
|
|
break;
|
|
}
|
|
|
|
/* 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.active_low)
|
|
*flags |= GPIO_ACTIVE_LOW;
|
|
|
|
return desc;
|
|
}
|
|
|
|
static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev)
|
|
{
|
|
const char *dev_id = dev ? dev_name(dev) : NULL;
|
|
struct gpiod_lookup_table *table;
|
|
|
|
mutex_lock(&gpio_lookup_lock);
|
|
|
|
list_for_each_entry(table, &gpio_lookup_list, list) {
|
|
if (table->dev_id && dev_id) {
|
|
/*
|
|
* Valid strings on both ends, must be identical to have
|
|
* a match
|
|
*/
|
|
if (!strcmp(table->dev_id, dev_id))
|
|
goto found;
|
|
} else {
|
|
/*
|
|
* One of the pointers is NULL, so both must be to have
|
|
* a match
|
|
*/
|
|
if (dev_id == table->dev_id)
|
|
goto found;
|
|
}
|
|
}
|
|
table = NULL;
|
|
|
|
found:
|
|
mutex_unlock(&gpio_lookup_lock);
|
|
return table;
|
|
}
|
|
|
|
static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
|
|
unsigned int idx,
|
|
enum gpio_lookup_flags *flags)
|
|
{
|
|
struct gpio_desc *desc = ERR_PTR(-ENOENT);
|
|
struct gpiod_lookup_table *table;
|
|
struct gpiod_lookup *p;
|
|
|
|
table = gpiod_find_lookup_table(dev);
|
|
if (!table)
|
|
return desc;
|
|
|
|
for (p = &table->table[0]; p->chip_label; p++) {
|
|
struct gpio_chip *chip;
|
|
|
|
/* idx must always match exactly */
|
|
if (p->idx != idx)
|
|
continue;
|
|
|
|
/* If the lookup entry has a con_id, require exact match */
|
|
if (p->con_id && (!con_id || strcmp(p->con_id, con_id)))
|
|
continue;
|
|
|
|
chip = find_chip_by_name(p->chip_label);
|
|
|
|
if (!chip) {
|
|
dev_err(dev, "cannot find GPIO chip %s\n",
|
|
p->chip_label);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
if (chip->ngpio <= p->chip_hwnum) {
|
|
dev_err(dev,
|
|
"requested GPIO %d is out of range [0..%d] for chip %s\n",
|
|
idx, chip->ngpio, chip->label);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
desc = gpiochip_get_desc(chip, p->chip_hwnum);
|
|
*flags = p->flags;
|
|
|
|
return desc;
|
|
}
|
|
|
|
return desc;
|
|
}
|
|
|
|
static int dt_gpio_count(struct device *dev, const char *con_id)
|
|
{
|
|
int ret;
|
|
char propname[32];
|
|
unsigned int i;
|
|
|
|
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 = of_gpio_named_count(dev->of_node, propname);
|
|
if (ret >= 0)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int platform_gpio_count(struct device *dev, const char *con_id)
|
|
{
|
|
struct gpiod_lookup_table *table;
|
|
struct gpiod_lookup *p;
|
|
unsigned int count = 0;
|
|
|
|
table = gpiod_find_lookup_table(dev);
|
|
if (!table)
|
|
return -ENOENT;
|
|
|
|
for (p = &table->table[0]; p->chip_label; p++) {
|
|
if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) ||
|
|
(!con_id && !p->con_id))
|
|
count++;
|
|
}
|
|
if (!count)
|
|
return -ENOENT;
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* gpiod_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 gpiod_count(struct device *dev, const char *con_id)
|
|
{
|
|
int count = -ENOENT;
|
|
|
|
if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
|
|
count = dt_gpio_count(dev, con_id);
|
|
else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev))
|
|
count = acpi_gpio_count(dev, con_id);
|
|
|
|
if (count < 0)
|
|
count = platform_gpio_count(dev, con_id);
|
|
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_count);
|
|
|
|
/**
|
|
* gpiod_get - obtain a GPIO for a given GPIO function
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
* @flags: optional GPIO initialization flags
|
|
*
|
|
* Return the GPIO descriptor corresponding to the function con_id of device
|
|
* dev, -ENOENT if no GPIO has been assigned to the requested function, or
|
|
* another IS_ERR() code if an error occurred while trying to acquire the GPIO.
|
|
*/
|
|
struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id,
|
|
enum gpiod_flags flags)
|
|
{
|
|
return gpiod_get_index(dev, con_id, 0, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get);
|
|
|
|
/**
|
|
* gpiod_get_optional - obtain an optional GPIO for a given GPIO function
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
* @flags: optional GPIO initialization flags
|
|
*
|
|
* This is equivalent to gpiod_get(), except that when no GPIO was assigned to
|
|
* the requested function it will return NULL. This is convenient for drivers
|
|
* that need to handle optional GPIOs.
|
|
*/
|
|
struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
|
|
const char *con_id,
|
|
enum gpiod_flags flags)
|
|
{
|
|
return gpiod_get_index_optional(dev, con_id, 0, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_optional);
|
|
|
|
/**
|
|
* gpiod_parse_flags - helper function to parse GPIO lookup flags
|
|
* @desc: gpio to be setup
|
|
* @lflags: gpio_lookup_flags - returned from of_find_gpio() or
|
|
* of_get_gpio_hog()
|
|
*
|
|
* Set the GPIO descriptor flags based on the given GPIO lookup flags.
|
|
*/
|
|
static void gpiod_parse_flags(struct gpio_desc *desc, unsigned long lflags)
|
|
{
|
|
if (lflags & GPIO_ACTIVE_LOW)
|
|
set_bit(FLAG_ACTIVE_LOW, &desc->flags);
|
|
if (lflags & GPIO_OPEN_DRAIN)
|
|
set_bit(FLAG_OPEN_DRAIN, &desc->flags);
|
|
if (lflags & GPIO_OPEN_SOURCE)
|
|
set_bit(FLAG_OPEN_SOURCE, &desc->flags);
|
|
}
|
|
|
|
/**
|
|
* gpiod_configure_flags - helper function to configure a given GPIO
|
|
* @desc: gpio whose value will be assigned
|
|
* @con_id: function within the GPIO consumer
|
|
* @dflags: gpiod_flags - optional GPIO initialization flags
|
|
*
|
|
* Return 0 on success, -ENOENT if no GPIO has been assigned to the
|
|
* requested function and/or index, or another IS_ERR() code if an error
|
|
* occurred while trying to acquire the GPIO.
|
|
*/
|
|
static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
|
|
enum gpiod_flags dflags)
|
|
{
|
|
int status;
|
|
|
|
/* No particular flag request, return here... */
|
|
if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) {
|
|
pr_debug("no flags found for %s\n", con_id);
|
|
return 0;
|
|
}
|
|
|
|
/* Process flags */
|
|
if (dflags & GPIOD_FLAGS_BIT_DIR_OUT)
|
|
status = gpiod_direction_output(desc,
|
|
dflags & GPIOD_FLAGS_BIT_DIR_VAL);
|
|
else
|
|
status = gpiod_direction_input(desc);
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* gpiod_get_index - obtain a GPIO from a multi-index GPIO function
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
* @idx: index of the GPIO to obtain in the consumer
|
|
* @flags: optional GPIO initialization flags
|
|
*
|
|
* This variant of gpiod_get() allows to access GPIOs other than the first
|
|
* defined one for functions that define several GPIOs.
|
|
*
|
|
* Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the
|
|
* requested function and/or index, or another IS_ERR() code if an error
|
|
* occurred while trying to acquire the GPIO.
|
|
*/
|
|
struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
|
|
const char *con_id,
|
|
unsigned int idx,
|
|
enum gpiod_flags flags)
|
|
{
|
|
struct gpio_desc *desc = NULL;
|
|
int status;
|
|
enum gpio_lookup_flags lookupflags = 0;
|
|
|
|
dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id);
|
|
|
|
if (dev) {
|
|
/* Using device tree? */
|
|
if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
|
|
dev_dbg(dev, "using device tree for GPIO lookup\n");
|
|
desc = of_find_gpio(dev, con_id, idx, &lookupflags);
|
|
} else if (ACPI_COMPANION(dev)) {
|
|
dev_dbg(dev, "using ACPI for GPIO lookup\n");
|
|
desc = acpi_find_gpio(dev, con_id, idx, &lookupflags);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Either we are not using DT or ACPI, or their lookup did not return
|
|
* a result. In that case, use platform lookup as a fallback.
|
|
*/
|
|
if (!desc || desc == ERR_PTR(-ENOENT)) {
|
|
dev_dbg(dev, "using lookup tables for GPIO lookup\n");
|
|
desc = gpiod_find(dev, con_id, idx, &lookupflags);
|
|
}
|
|
|
|
if (IS_ERR(desc)) {
|
|
dev_dbg(dev, "lookup for GPIO %s failed\n", con_id);
|
|
return desc;
|
|
}
|
|
|
|
gpiod_parse_flags(desc, lookupflags);
|
|
|
|
status = gpiod_request(desc, con_id);
|
|
if (status < 0)
|
|
return ERR_PTR(status);
|
|
|
|
status = gpiod_configure_flags(desc, con_id, flags);
|
|
if (status < 0) {
|
|
dev_dbg(dev, "setup of GPIO %s failed\n", con_id);
|
|
gpiod_put(desc);
|
|
return ERR_PTR(status);
|
|
}
|
|
|
|
return desc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_index);
|
|
|
|
/**
|
|
* fwnode_get_named_gpiod - obtain a GPIO from firmware node
|
|
* @fwnode: handle of the firmware node
|
|
* @propname: name of the firmware property representing the GPIO
|
|
*
|
|
* This function can be used for drivers that get their configuration
|
|
* from firmware.
|
|
*
|
|
* Function properly finds the corresponding GPIO using whatever is the
|
|
* underlying firmware interface and then makes sure that the GPIO
|
|
* descriptor is requested before it is returned to the caller.
|
|
*
|
|
* In case of error an ERR_PTR() is returned.
|
|
*/
|
|
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
|
|
const char *propname)
|
|
{
|
|
struct gpio_desc *desc = ERR_PTR(-ENODEV);
|
|
bool active_low = false;
|
|
bool single_ended = false;
|
|
int ret;
|
|
|
|
if (!fwnode)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (is_of_node(fwnode)) {
|
|
enum of_gpio_flags flags;
|
|
|
|
desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0,
|
|
&flags);
|
|
if (!IS_ERR(desc)) {
|
|
active_low = flags & OF_GPIO_ACTIVE_LOW;
|
|
single_ended = flags & OF_GPIO_SINGLE_ENDED;
|
|
}
|
|
} else if (is_acpi_node(fwnode)) {
|
|
struct acpi_gpio_info info;
|
|
|
|
desc = acpi_node_get_gpiod(fwnode, propname, 0, &info);
|
|
if (!IS_ERR(desc))
|
|
active_low = info.active_low;
|
|
}
|
|
|
|
if (IS_ERR(desc))
|
|
return desc;
|
|
|
|
if (active_low)
|
|
set_bit(FLAG_ACTIVE_LOW, &desc->flags);
|
|
|
|
if (single_ended) {
|
|
if (active_low)
|
|
set_bit(FLAG_OPEN_DRAIN, &desc->flags);
|
|
else
|
|
set_bit(FLAG_OPEN_SOURCE, &desc->flags);
|
|
}
|
|
|
|
ret = gpiod_request(desc, NULL);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
return desc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod);
|
|
|
|
/**
|
|
* gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO
|
|
* function
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
* @index: index of the GPIO to obtain in the consumer
|
|
* @flags: optional GPIO initialization flags
|
|
*
|
|
* This is equivalent to gpiod_get_index(), except that when no GPIO with the
|
|
* specified index was assigned to the requested function it will return NULL.
|
|
* This is convenient for drivers that need to handle optional GPIOs.
|
|
*/
|
|
struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
|
|
const char *con_id,
|
|
unsigned int index,
|
|
enum gpiod_flags flags)
|
|
{
|
|
struct gpio_desc *desc;
|
|
|
|
desc = gpiod_get_index(dev, con_id, index, flags);
|
|
if (IS_ERR(desc)) {
|
|
if (PTR_ERR(desc) == -ENOENT)
|
|
return NULL;
|
|
}
|
|
|
|
return desc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_index_optional);
|
|
|
|
/**
|
|
* gpiod_hog - Hog the specified GPIO desc given the provided flags
|
|
* @desc: gpio whose value will be assigned
|
|
* @name: gpio line name
|
|
* @lflags: gpio_lookup_flags - returned from of_find_gpio() or
|
|
* of_get_gpio_hog()
|
|
* @dflags: gpiod_flags - optional GPIO initialization flags
|
|
*/
|
|
int gpiod_hog(struct gpio_desc *desc, const char *name,
|
|
unsigned long lflags, enum gpiod_flags dflags)
|
|
{
|
|
struct gpio_chip *chip;
|
|
struct gpio_desc *local_desc;
|
|
int hwnum;
|
|
int status;
|
|
|
|
chip = gpiod_to_chip(desc);
|
|
hwnum = gpio_chip_hwgpio(desc);
|
|
|
|
gpiod_parse_flags(desc, lflags);
|
|
|
|
local_desc = gpiochip_request_own_desc(chip, hwnum, name);
|
|
if (IS_ERR(local_desc)) {
|
|
pr_err("requesting hog GPIO %s (chip %s, offset %d) failed\n",
|
|
name, chip->label, hwnum);
|
|
return PTR_ERR(local_desc);
|
|
}
|
|
|
|
status = gpiod_configure_flags(desc, name, dflags);
|
|
if (status < 0) {
|
|
pr_err("setup of hog GPIO %s (chip %s, offset %d) failed\n",
|
|
name, chip->label, hwnum);
|
|
gpiochip_free_own_desc(desc);
|
|
return status;
|
|
}
|
|
|
|
/* Mark GPIO as hogged so it can be identified and removed later */
|
|
set_bit(FLAG_IS_HOGGED, &desc->flags);
|
|
|
|
pr_info("GPIO line %d (%s) hogged as %s%s\n",
|
|
desc_to_gpio(desc), name,
|
|
(dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input",
|
|
(dflags&GPIOD_FLAGS_BIT_DIR_OUT) ?
|
|
(dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":"");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog
|
|
* @chip: gpio chip to act on
|
|
*
|
|
* This is only used by of_gpiochip_remove to free hogged gpios
|
|
*/
|
|
static void gpiochip_free_hogs(struct gpio_chip *chip)
|
|
{
|
|
int id;
|
|
|
|
for (id = 0; id < chip->ngpio; id++) {
|
|
if (test_bit(FLAG_IS_HOGGED, &chip->desc[id].flags))
|
|
gpiochip_free_own_desc(&chip->desc[id]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
* @flags: optional GPIO initialization flags
|
|
*
|
|
* This function acquires all the GPIOs defined under a given function.
|
|
*
|
|
* Return a struct gpio_descs containing an array of descriptors, -ENOENT if
|
|
* no GPIO has been assigned to the requested function, or another IS_ERR()
|
|
* code if an error occurred while trying to acquire the GPIOs.
|
|
*/
|
|
struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
|
|
const char *con_id,
|
|
enum gpiod_flags flags)
|
|
{
|
|
struct gpio_desc *desc;
|
|
struct gpio_descs *descs;
|
|
int count;
|
|
|
|
count = gpiod_count(dev, con_id);
|
|
if (count < 0)
|
|
return ERR_PTR(count);
|
|
|
|
descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count,
|
|
GFP_KERNEL);
|
|
if (!descs)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
for (descs->ndescs = 0; descs->ndescs < count; ) {
|
|
desc = gpiod_get_index(dev, con_id, descs->ndescs, flags);
|
|
if (IS_ERR(desc)) {
|
|
gpiod_put_array(descs);
|
|
return ERR_CAST(desc);
|
|
}
|
|
descs->desc[descs->ndescs] = desc;
|
|
descs->ndescs++;
|
|
}
|
|
return descs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_array);
|
|
|
|
/**
|
|
* gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO
|
|
* function
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
* @flags: optional GPIO initialization flags
|
|
*
|
|
* This is equivalent to gpiod_get_array(), except that when no GPIO was
|
|
* assigned to the requested function it will return NULL.
|
|
*/
|
|
struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev,
|
|
const char *con_id,
|
|
enum gpiod_flags flags)
|
|
{
|
|
struct gpio_descs *descs;
|
|
|
|
descs = gpiod_get_array(dev, con_id, flags);
|
|
if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT))
|
|
return NULL;
|
|
|
|
return descs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_get_array_optional);
|
|
|
|
/**
|
|
* gpiod_put - dispose of a GPIO descriptor
|
|
* @desc: GPIO descriptor to dispose of
|
|
*
|
|
* No descriptor can be used after gpiod_put() has been called on it.
|
|
*/
|
|
void gpiod_put(struct gpio_desc *desc)
|
|
{
|
|
gpiod_free(desc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_put);
|
|
|
|
/**
|
|
* gpiod_put_array - dispose of multiple GPIO descriptors
|
|
* @descs: struct gpio_descs containing an array of descriptors
|
|
*/
|
|
void gpiod_put_array(struct gpio_descs *descs)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < descs->ndescs; i++)
|
|
gpiod_put(descs->desc[i]);
|
|
|
|
kfree(descs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpiod_put_array);
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
|
|
{
|
|
unsigned i;
|
|
unsigned gpio = chip->base;
|
|
struct gpio_desc *gdesc = &chip->desc[0];
|
|
int is_out;
|
|
int is_irq;
|
|
|
|
for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) {
|
|
if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) {
|
|
if (gdesc->name) {
|
|
seq_printf(s, " gpio-%-3d (%-20.20s)\n",
|
|
gpio, gdesc->name);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
gpiod_get_direction(gdesc);
|
|
is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
|
|
is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
|
|
seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s",
|
|
gpio, gdesc->name ? gdesc->name : "", gdesc->label,
|
|
is_out ? "out" : "in ",
|
|
chip->get
|
|
? (chip->get(chip, i) ? "hi" : "lo")
|
|
: "? ",
|
|
is_irq ? "IRQ" : " ");
|
|
seq_printf(s, "\n");
|
|
}
|
|
}
|
|
|
|
static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
unsigned long flags;
|
|
struct gpio_chip *chip = NULL;
|
|
loff_t index = *pos;
|
|
|
|
s->private = "";
|
|
|
|
spin_lock_irqsave(&gpio_lock, flags);
|
|
list_for_each_entry(chip, &gpio_chips, list)
|
|
if (index-- == 0) {
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
return chip;
|
|
}
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
unsigned long flags;
|
|
struct gpio_chip *chip = v;
|
|
void *ret = NULL;
|
|
|
|
spin_lock_irqsave(&gpio_lock, flags);
|
|
if (list_is_last(&chip->list, &gpio_chips))
|
|
ret = NULL;
|
|
else
|
|
ret = list_entry(chip->list.next, struct gpio_chip, list);
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
|
|
s->private = "\n";
|
|
++*pos;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void gpiolib_seq_stop(struct seq_file *s, void *v)
|
|
{
|
|
}
|
|
|
|
static int gpiolib_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct gpio_chip *chip = v;
|
|
struct device *dev;
|
|
|
|
seq_printf(s, "%sGPIOs %d-%d", (char *)s->private,
|
|
chip->base, chip->base + chip->ngpio - 1);
|
|
dev = chip->parent;
|
|
if (dev)
|
|
seq_printf(s, ", %s/%s", dev->bus ? dev->bus->name : "no-bus",
|
|
dev_name(dev));
|
|
if (chip->label)
|
|
seq_printf(s, ", %s", chip->label);
|
|
if (chip->can_sleep)
|
|
seq_printf(s, ", can sleep");
|
|
seq_printf(s, ":\n");
|
|
|
|
if (chip->dbg_show)
|
|
chip->dbg_show(s, chip);
|
|
else
|
|
gpiolib_dbg_show(s, chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations gpiolib_seq_ops = {
|
|
.start = gpiolib_seq_start,
|
|
.next = gpiolib_seq_next,
|
|
.stop = gpiolib_seq_stop,
|
|
.show = gpiolib_seq_show,
|
|
};
|
|
|
|
static int gpiolib_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &gpiolib_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations gpiolib_operations = {
|
|
.owner = THIS_MODULE,
|
|
.open = gpiolib_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int __init gpiolib_debugfs_init(void)
|
|
{
|
|
/* /sys/kernel/debug/gpio */
|
|
(void) debugfs_create_file("gpio", S_IFREG | S_IRUGO,
|
|
NULL, NULL, &gpiolib_operations);
|
|
return 0;
|
|
}
|
|
subsys_initcall(gpiolib_debugfs_init);
|
|
|
|
#endif /* DEBUG_FS */
|