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9427ecbe MW |
1 | /* |
2 | * Device property helpers for GPIO chips. | |
3 | * | |
4 | * Copyright (C) 2016, Intel Corporation | |
5 | * Author: Mika Westerberg <mika.westerberg@linux.intel.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/property.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/gpio/consumer.h> | |
15 | #include <linux/gpio/driver.h> | |
16 | ||
17 | #include "gpiolib.h" | |
18 | ||
19 | /** | |
20 | * devprop_gpiochip_set_names - Set GPIO line names using device properties | |
21 | * @chip: GPIO chip whose lines should be named, if possible | |
22 | * | |
23 | * Looks for device property "gpio-line-names" and if it exists assigns | |
24 | * GPIO line names for the chip. The memory allocated for the assigned | |
25 | * names belong to the underlying firmware node and should not be released | |
26 | * by the caller. | |
27 | */ | |
28 | void devprop_gpiochip_set_names(struct gpio_chip *chip) | |
29 | { | |
30 | struct gpio_device *gdev = chip->gpiodev; | |
31 | const char **names; | |
32 | int ret, i; | |
33 | ||
5a195c6d TT |
34 | if (!chip->parent) { |
35 | dev_warn(&gdev->dev, "GPIO chip parent is NULL\n"); | |
36 | return; | |
37 | } | |
38 | ||
9427ecbe MW |
39 | ret = device_property_read_string_array(chip->parent, "gpio-line-names", |
40 | NULL, 0); | |
41 | if (ret < 0) | |
42 | return; | |
43 | ||
44 | if (ret != gdev->ngpio) { | |
45 | dev_warn(chip->parent, | |
46 | "names %d do not match number of GPIOs %d\n", ret, | |
47 | gdev->ngpio); | |
48 | return; | |
49 | } | |
50 | ||
51 | names = kcalloc(gdev->ngpio, sizeof(*names), GFP_KERNEL); | |
52 | if (!names) | |
53 | return; | |
54 | ||
55 | ret = device_property_read_string_array(chip->parent, "gpio-line-names", | |
56 | names, gdev->ngpio); | |
57 | if (ret < 0) { | |
58 | dev_warn(chip->parent, "failed to read GPIO line names\n"); | |
59 | kfree(names); | |
60 | return; | |
61 | } | |
62 | ||
63 | for (i = 0; i < gdev->ngpio; i++) | |
64 | gdev->descs[i].name = names[i]; | |
65 | ||
66 | kfree(names); | |
67 | } |