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dae5f0af | 1 | // SPDX-License-Identifier: GPL-2.0 |
9427ecbe MW |
2 | /* |
3 | * Device property helpers for GPIO chips. | |
4 | * | |
5 | * Copyright (C) 2016, Intel Corporation | |
6 | * Author: Mika Westerberg <mika.westerberg@linux.intel.com> | |
9427ecbe MW |
7 | */ |
8 | ||
9 | #include <linux/property.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/gpio/consumer.h> | |
12 | #include <linux/gpio/driver.h> | |
13 | ||
14 | #include "gpiolib.h" | |
15 | ||
16 | /** | |
17 | * devprop_gpiochip_set_names - Set GPIO line names using device properties | |
18 | * @chip: GPIO chip whose lines should be named, if possible | |
82270335 | 19 | * @fwnode: Property Node containing the gpio-line-names property |
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20 | * |
21 | * Looks for device property "gpio-line-names" and if it exists assigns | |
22 | * GPIO line names for the chip. The memory allocated for the assigned | |
23 | * names belong to the underlying firmware node and should not be released | |
24 | * by the caller. | |
25 | */ | |
82270335 CL |
26 | void devprop_gpiochip_set_names(struct gpio_chip *chip, |
27 | const struct fwnode_handle *fwnode) | |
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28 | { |
29 | struct gpio_device *gdev = chip->gpiodev; | |
30 | const char **names; | |
31 | int ret, i; | |
8dc19697 | 32 | int count; |
9427ecbe | 33 | |
8dc19697 CB |
34 | count = fwnode_property_read_string_array(fwnode, "gpio-line-names", |
35 | NULL, 0); | |
36 | if (count < 0) | |
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37 | return; |
38 | ||
8dc19697 CB |
39 | if (count > gdev->ngpio) |
40 | count = gdev->ngpio; | |
9427ecbe | 41 | |
8dc19697 | 42 | names = kcalloc(count, sizeof(*names), GFP_KERNEL); |
9427ecbe MW |
43 | if (!names) |
44 | return; | |
45 | ||
82270335 | 46 | ret = fwnode_property_read_string_array(fwnode, "gpio-line-names", |
8dc19697 | 47 | names, count); |
9427ecbe | 48 | if (ret < 0) { |
82270335 | 49 | dev_warn(&gdev->dev, "failed to read GPIO line names\n"); |
9427ecbe MW |
50 | kfree(names); |
51 | return; | |
52 | } | |
53 | ||
8dc19697 | 54 | for (i = 0; i < count; i++) |
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55 | gdev->descs[i].name = names[i]; |
56 | ||
57 | kfree(names); | |
58 | } |