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