mirror of https://gitee.com/openkylin/linux.git
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Device property helpers for GPIO chips.
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*
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* Copyright (C) 2016, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/driver.h>
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#include <linux/export.h>
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#include "gpiolib.h"
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/**
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* devprop_gpiochip_set_names - Set GPIO line names using device properties
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* @chip: GPIO chip whose lines should be named, if possible
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* @fwnode: Property Node containing the gpio-line-names property
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*
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* Looks for device property "gpio-line-names" and if it exists assigns
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* GPIO line names for the chip. The memory allocated for the assigned
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* names belong to the underlying firmware node and should not be released
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* by the caller.
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*/
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void devprop_gpiochip_set_names(struct gpio_chip *chip,
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const struct fwnode_handle *fwnode)
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{
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struct gpio_device *gdev = chip->gpiodev;
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const char **names;
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int ret, i;
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int count;
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count = fwnode_property_read_string_array(fwnode, "gpio-line-names",
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NULL, 0);
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if (count < 0)
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return;
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if (count > gdev->ngpio) {
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dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
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count, gdev->ngpio);
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count = gdev->ngpio;
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}
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names = kcalloc(count, sizeof(*names), GFP_KERNEL);
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if (!names)
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return;
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ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
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names, count);
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if (ret < 0) {
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dev_warn(&gdev->dev, "failed to read GPIO line names\n");
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kfree(names);
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return;
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}
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for (i = 0; i < count; i++)
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gdev->descs[i].name = names[i];
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kfree(names);
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}
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EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names);
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