637 lines
16 KiB
C
637 lines
16 KiB
C
/*
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* OF helpers for the GPIO API
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*
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* Copyright (c) 2007-2008 MontaVista Software, Inc.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_gpio.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/slab.h>
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#include <linux/gpio/machine.h>
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#include "gpiolib.h"
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static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data)
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{
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struct of_phandle_args *gpiospec = data;
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return chip->gpiodev->dev.of_node == gpiospec->np &&
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chip->of_xlate(chip, gpiospec, NULL) >= 0;
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}
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static struct gpio_chip *of_find_gpiochip_by_xlate(
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struct of_phandle_args *gpiospec)
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{
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return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate);
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}
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static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip,
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struct of_phandle_args *gpiospec,
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enum of_gpio_flags *flags)
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{
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int ret;
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if (chip->of_gpio_n_cells != gpiospec->args_count)
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return ERR_PTR(-EINVAL);
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ret = chip->of_xlate(chip, gpiospec, flags);
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if (ret < 0)
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return ERR_PTR(ret);
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return gpiochip_get_desc(chip, ret);
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}
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static void of_gpio_flags_quirks(struct device_node *np,
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enum of_gpio_flags *flags)
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{
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/*
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* Some GPIO fixed regulator quirks.
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* Note that active low is the default.
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*/
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if (IS_ENABLED(CONFIG_REGULATOR) &&
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(of_device_is_compatible(np, "reg-fixed-voltage") ||
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of_device_is_compatible(np, "regulator-gpio"))) {
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/*
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* The regulator GPIO handles are specified such that the
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* presence or absence of "enable-active-high" solely controls
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* the polarity of the GPIO line. Any phandle flags must
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* be actively ignored.
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*/
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if (*flags & OF_GPIO_ACTIVE_LOW) {
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pr_warn("%s GPIO handle specifies active low - ignored\n",
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of_node_full_name(np));
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*flags &= ~OF_GPIO_ACTIVE_LOW;
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}
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if (!of_property_read_bool(np, "enable-active-high"))
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*flags |= OF_GPIO_ACTIVE_LOW;
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}
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/*
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* Legacy open drain handling for fixed voltage regulators.
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*/
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if (IS_ENABLED(CONFIG_REGULATOR) &&
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of_device_is_compatible(np, "reg-fixed-voltage") &&
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of_property_read_bool(np, "gpio-open-drain")) {
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*flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN);
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pr_info("%s uses legacy open drain flag - update the DTS if you can\n",
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of_node_full_name(np));
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}
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}
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/**
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* of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
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* @np: device node to get GPIO from
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* @propname: property name containing gpio specifier(s)
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* @index: index of the GPIO
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* @flags: a flags pointer to fill in
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*
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* Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
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* value on the error condition. If @flags is not NULL the function also fills
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* in flags for the GPIO.
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*/
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struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
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const char *propname, int index, enum of_gpio_flags *flags)
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{
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struct of_phandle_args gpiospec;
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struct gpio_chip *chip;
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struct gpio_desc *desc;
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int ret;
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ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
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&gpiospec);
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if (ret) {
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pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n",
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__func__, propname, np, index);
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return ERR_PTR(ret);
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}
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chip = of_find_gpiochip_by_xlate(&gpiospec);
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if (!chip) {
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desc = ERR_PTR(-EPROBE_DEFER);
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goto out;
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}
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desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags);
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if (IS_ERR(desc))
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goto out;
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if (flags)
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of_gpio_flags_quirks(np, flags);
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pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n",
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__func__, propname, np, index,
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PTR_ERR_OR_ZERO(desc));
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out:
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of_node_put(gpiospec.np);
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return desc;
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}
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int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
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int index, enum of_gpio_flags *flags)
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{
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struct gpio_desc *desc;
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desc = of_get_named_gpiod_flags(np, list_name, index, flags);
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if (IS_ERR(desc))
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return PTR_ERR(desc);
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else
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return desc_to_gpio(desc);
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}
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EXPORT_SYMBOL(of_get_named_gpio_flags);
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/*
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* The SPI GPIO bindings happened before we managed to establish that GPIO
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* properties should be named "foo-gpios" so we have this special kludge for
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* them.
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*/
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static struct gpio_desc *of_find_spi_gpio(struct device *dev, const char *con_id,
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enum of_gpio_flags *of_flags)
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{
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char prop_name[32]; /* 32 is max size of property name */
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struct device_node *np = dev->of_node;
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struct gpio_desc *desc;
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/*
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* Hopefully the compiler stubs the rest of the function if this
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* is false.
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*/
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if (!IS_ENABLED(CONFIG_SPI_MASTER))
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return ERR_PTR(-ENOENT);
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/* Allow this specifically for "spi-gpio" devices */
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if (!of_device_is_compatible(np, "spi-gpio") || !con_id)
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return ERR_PTR(-ENOENT);
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/* Will be "gpio-sck", "gpio-mosi" or "gpio-miso" */
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snprintf(prop_name, sizeof(prop_name), "%s-%s", "gpio", con_id);
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desc = of_get_named_gpiod_flags(np, prop_name, 0, of_flags);
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return desc;
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}
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/*
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* Some regulator bindings happened before we managed to establish that GPIO
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* properties should be named "foo-gpios" so we have this special kludge for
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* them.
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*/
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static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *con_id,
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enum of_gpio_flags *of_flags)
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{
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/* These are the connection IDs we accept as legacy GPIO phandles */
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const char *whitelist[] = {
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"wlf,ldoena", /* Arizona */
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"wlf,ldo1ena", /* WM8994 */
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"wlf,ldo2ena", /* WM8994 */
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};
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struct device_node *np = dev->of_node;
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struct gpio_desc *desc;
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int i;
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if (!IS_ENABLED(CONFIG_REGULATOR))
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return ERR_PTR(-ENOENT);
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if (!con_id)
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return ERR_PTR(-ENOENT);
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for (i = 0; i < ARRAY_SIZE(whitelist); i++)
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if (!strcmp(con_id, whitelist[i]))
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break;
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if (i == ARRAY_SIZE(whitelist))
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return ERR_PTR(-ENOENT);
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desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags);
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return desc;
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}
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struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
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unsigned int idx,
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enum gpio_lookup_flags *flags)
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{
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char prop_name[32]; /* 32 is max size of property name */
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enum of_gpio_flags of_flags;
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struct gpio_desc *desc;
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unsigned int i;
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/* Try GPIO property "foo-gpios" and "foo-gpio" */
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for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
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if (con_id)
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snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id,
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gpio_suffixes[i]);
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else
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snprintf(prop_name, sizeof(prop_name), "%s",
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gpio_suffixes[i]);
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desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx,
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&of_flags);
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/*
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* -EPROBE_DEFER in our case means that we found a
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* valid GPIO property, but no controller has been
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* registered so far.
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*
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* This means we don't need to look any further for
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* alternate name conventions, and we should really
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* preserve the return code for our user to be able to
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* retry probing later.
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*/
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if (IS_ERR(desc) && PTR_ERR(desc) == -EPROBE_DEFER)
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return desc;
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if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
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break;
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}
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/* Special handling for SPI GPIOs if used */
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if (IS_ERR(desc))
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desc = of_find_spi_gpio(dev, con_id, &of_flags);
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/* Special handling for regulator GPIOs if used */
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if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
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desc = of_find_regulator_gpio(dev, con_id, &of_flags);
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if (IS_ERR(desc))
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return desc;
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if (of_flags & OF_GPIO_ACTIVE_LOW)
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*flags |= GPIO_ACTIVE_LOW;
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if (of_flags & OF_GPIO_SINGLE_ENDED) {
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if (of_flags & OF_GPIO_OPEN_DRAIN)
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*flags |= GPIO_OPEN_DRAIN;
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else
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*flags |= GPIO_OPEN_SOURCE;
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}
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if (of_flags & OF_GPIO_TRANSITORY)
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*flags |= GPIO_TRANSITORY;
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return desc;
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}
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/**
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* of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
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* @np: device node to get GPIO from
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* @chip: GPIO chip whose hog is parsed
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* @idx: Index of the GPIO to parse
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* @name: GPIO line name
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* @lflags: gpio_lookup_flags - returned from of_find_gpio() or
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* of_parse_own_gpio()
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* @dflags: gpiod_flags - optional GPIO initialization flags
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*
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* Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
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* value on the error condition.
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*/
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static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
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struct gpio_chip *chip,
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unsigned int idx, const char **name,
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enum gpio_lookup_flags *lflags,
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enum gpiod_flags *dflags)
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{
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struct device_node *chip_np;
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enum of_gpio_flags xlate_flags;
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struct of_phandle_args gpiospec;
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struct gpio_desc *desc;
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unsigned int i;
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u32 tmp;
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int ret;
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chip_np = chip->of_node;
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if (!chip_np)
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return ERR_PTR(-EINVAL);
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xlate_flags = 0;
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*lflags = 0;
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*dflags = 0;
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ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
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if (ret)
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return ERR_PTR(ret);
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gpiospec.np = chip_np;
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gpiospec.args_count = tmp;
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for (i = 0; i < tmp; i++) {
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ret = of_property_read_u32_index(np, "gpios", idx * tmp + i,
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&gpiospec.args[i]);
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if (ret)
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return ERR_PTR(ret);
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}
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desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags);
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if (IS_ERR(desc))
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return desc;
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if (xlate_flags & OF_GPIO_ACTIVE_LOW)
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*lflags |= GPIO_ACTIVE_LOW;
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if (xlate_flags & OF_GPIO_TRANSITORY)
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*lflags |= GPIO_TRANSITORY;
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if (of_property_read_bool(np, "input"))
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*dflags |= GPIOD_IN;
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else if (of_property_read_bool(np, "output-low"))
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*dflags |= GPIOD_OUT_LOW;
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else if (of_property_read_bool(np, "output-high"))
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*dflags |= GPIOD_OUT_HIGH;
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else {
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pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n",
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desc_to_gpio(desc), np->name);
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return ERR_PTR(-EINVAL);
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}
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if (name && of_property_read_string(np, "line-name", name))
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*name = np->name;
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return desc;
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}
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/**
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* of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
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* @chip: gpio chip to act on
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*
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* This is only used by of_gpiochip_add to request/set GPIO initial
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* configuration.
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* It returns error if it fails otherwise 0 on success.
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*/
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static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
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{
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struct gpio_desc *desc = NULL;
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struct device_node *np;
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const char *name;
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enum gpio_lookup_flags lflags;
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enum gpiod_flags dflags;
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unsigned int i;
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int ret;
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for_each_available_child_of_node(chip->of_node, np) {
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if (!of_property_read_bool(np, "gpio-hog"))
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continue;
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for (i = 0;; i++) {
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desc = of_parse_own_gpio(np, chip, i, &name, &lflags,
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&dflags);
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if (IS_ERR(desc))
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break;
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ret = gpiod_hog(desc, name, lflags, dflags);
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if (ret < 0) {
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of_node_put(np);
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return ret;
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}
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}
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}
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return 0;
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}
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/**
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* of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags
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* @gc: pointer to the gpio_chip structure
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* @gpiospec: GPIO specifier as found in the device tree
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* @flags: a flags pointer to fill in
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*
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* This is simple translation function, suitable for the most 1:1 mapped
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* GPIO chips. This function performs only one sanity check: whether GPIO
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* is less than ngpios (that is specified in the gpio_chip).
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*/
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int of_gpio_simple_xlate(struct gpio_chip *gc,
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const struct of_phandle_args *gpiospec, u32 *flags)
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{
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/*
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* We're discouraging gpio_cells < 2, since that way you'll have to
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* write your own xlate function (that will have to retrieve the GPIO
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* number and the flags from a single gpio cell -- this is possible,
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* but not recommended).
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*/
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if (gc->of_gpio_n_cells < 2) {
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WARN_ON(1);
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return -EINVAL;
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}
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if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
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return -EINVAL;
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if (gpiospec->args[0] >= gc->ngpio)
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return -EINVAL;
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if (flags)
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*flags = gpiospec->args[1];
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return gpiospec->args[0];
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}
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EXPORT_SYMBOL(of_gpio_simple_xlate);
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/**
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* of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank)
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* @np: device node of the GPIO chip
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* @mm_gc: pointer to the of_mm_gpio_chip allocated structure
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* @data: driver data to store in the struct gpio_chip
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*
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* To use this function you should allocate and fill mm_gc with:
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*
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* 1) In the gpio_chip structure:
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* - all the callbacks
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* - of_gpio_n_cells
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* - of_xlate callback (optional)
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*
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* 3) In the of_mm_gpio_chip structure:
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* - save_regs callback (optional)
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*
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* If succeeded, this function will map bank's memory and will
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* do all necessary work for you. Then you'll able to use .regs
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* to manage GPIOs from the callbacks.
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*/
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int of_mm_gpiochip_add_data(struct device_node *np,
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struct of_mm_gpio_chip *mm_gc,
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void *data)
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{
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int ret = -ENOMEM;
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struct gpio_chip *gc = &mm_gc->gc;
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gc->label = kasprintf(GFP_KERNEL, "%pOF", np);
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if (!gc->label)
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goto err0;
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mm_gc->regs = of_iomap(np, 0);
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if (!mm_gc->regs)
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goto err1;
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gc->base = -1;
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if (mm_gc->save_regs)
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mm_gc->save_regs(mm_gc);
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mm_gc->gc.of_node = np;
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ret = gpiochip_add_data(gc, data);
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if (ret)
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goto err2;
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return 0;
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err2:
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iounmap(mm_gc->regs);
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err1:
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kfree(gc->label);
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err0:
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pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret);
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return ret;
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}
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EXPORT_SYMBOL(of_mm_gpiochip_add_data);
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/**
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* of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
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* @mm_gc: pointer to the of_mm_gpio_chip allocated structure
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*/
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void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
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{
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struct gpio_chip *gc = &mm_gc->gc;
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if (!mm_gc)
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return;
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gpiochip_remove(gc);
|
|
iounmap(mm_gc->regs);
|
|
kfree(gc->label);
|
|
}
|
|
EXPORT_SYMBOL(of_mm_gpiochip_remove);
|
|
|
|
#ifdef CONFIG_PINCTRL
|
|
static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
|
|
{
|
|
struct device_node *np = chip->of_node;
|
|
struct of_phandle_args pinspec;
|
|
struct pinctrl_dev *pctldev;
|
|
int index = 0, ret;
|
|
const char *name;
|
|
static const char group_names_propname[] = "gpio-ranges-group-names";
|
|
struct property *group_names;
|
|
|
|
if (!np)
|
|
return 0;
|
|
|
|
group_names = of_find_property(np, group_names_propname, NULL);
|
|
|
|
for (;; index++) {
|
|
ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
|
|
index, &pinspec);
|
|
if (ret)
|
|
break;
|
|
|
|
pctldev = of_pinctrl_get(pinspec.np);
|
|
of_node_put(pinspec.np);
|
|
if (!pctldev)
|
|
return -EPROBE_DEFER;
|
|
|
|
if (pinspec.args[2]) {
|
|
if (group_names) {
|
|
of_property_read_string_index(np,
|
|
group_names_propname,
|
|
index, &name);
|
|
if (strlen(name)) {
|
|
pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n",
|
|
np);
|
|
break;
|
|
}
|
|
}
|
|
/* npins != 0: linear range */
|
|
ret = gpiochip_add_pin_range(chip,
|
|
pinctrl_dev_get_devname(pctldev),
|
|
pinspec.args[0],
|
|
pinspec.args[1],
|
|
pinspec.args[2]);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
/* npins == 0: special range */
|
|
if (pinspec.args[1]) {
|
|
pr_err("%pOF: Illegal gpio-range format.\n",
|
|
np);
|
|
break;
|
|
}
|
|
|
|
if (!group_names) {
|
|
pr_err("%pOF: GPIO group range requested but no %s property.\n",
|
|
np, group_names_propname);
|
|
break;
|
|
}
|
|
|
|
ret = of_property_read_string_index(np,
|
|
group_names_propname,
|
|
index, &name);
|
|
if (ret)
|
|
break;
|
|
|
|
if (!strlen(name)) {
|
|
pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n",
|
|
np);
|
|
break;
|
|
}
|
|
|
|
ret = gpiochip_add_pingroup_range(chip, pctldev,
|
|
pinspec.args[0], name);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
|
|
#endif
|
|
|
|
int of_gpiochip_add(struct gpio_chip *chip)
|
|
{
|
|
int status;
|
|
|
|
if ((!chip->of_node) && (chip->parent))
|
|
chip->of_node = chip->parent->of_node;
|
|
|
|
if (!chip->of_node)
|
|
return 0;
|
|
|
|
if (!chip->of_xlate) {
|
|
chip->of_gpio_n_cells = 2;
|
|
chip->of_xlate = of_gpio_simple_xlate;
|
|
}
|
|
|
|
if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS)
|
|
return -EINVAL;
|
|
|
|
status = of_gpiochip_add_pin_range(chip);
|
|
if (status)
|
|
return status;
|
|
|
|
/* If the chip defines names itself, these take precedence */
|
|
if (!chip->names)
|
|
devprop_gpiochip_set_names(chip,
|
|
of_fwnode_handle(chip->of_node));
|
|
|
|
of_node_get(chip->of_node);
|
|
|
|
return of_gpiochip_scan_gpios(chip);
|
|
}
|
|
|
|
void of_gpiochip_remove(struct gpio_chip *chip)
|
|
{
|
|
gpiochip_remove_pin_ranges(chip);
|
|
of_node_put(chip->of_node);
|
|
}
|