/* * Device property helpers for GPIO chips. * * Copyright (C) 2016, Intel Corporation * Author: Mika Westerberg * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include "gpiolib.h" /** * devprop_gpiochip_set_names - Set GPIO line names using device properties * @chip: GPIO chip whose lines should be named, if possible * * 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) { struct gpio_device *gdev = chip->gpiodev; const char **names; int ret, i; ret = device_property_read_string_array(chip->parent, "gpio-line-names", NULL, 0); if (ret < 0) return; if (ret != gdev->ngpio) { dev_warn(chip->parent, "names %d do not match number of GPIOs %d\n", ret, gdev->ngpio); return; } names = kcalloc(gdev->ngpio, sizeof(*names), GFP_KERNEL); if (!names) return; ret = device_property_read_string_array(chip->parent, "gpio-line-names", names, gdev->ngpio); if (ret < 0) { dev_warn(chip->parent, "failed to read GPIO line names\n"); kfree(names); return; } for (i = 0; i < gdev->ngpio; i++) gdev->descs[i].name = names[i]; kfree(names); }