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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 | |
82270335 | 22 | * @fwnode: Property Node containing the gpio-line-names property |
9427ecbe MW |
23 | * |
24 | * Looks for device property "gpio-line-names" and if it exists assigns | |
25 | * GPIO line names for the chip. The memory allocated for the assigned | |
26 | * names belong to the underlying firmware node and should not be released | |
27 | * by the caller. | |
28 | */ | |
82270335 CL |
29 | void devprop_gpiochip_set_names(struct gpio_chip *chip, |
30 | const struct fwnode_handle *fwnode) | |
9427ecbe MW |
31 | { |
32 | struct gpio_device *gdev = chip->gpiodev; | |
33 | const char **names; | |
34 | int ret, i; | |
35 | ||
82270335 | 36 | ret = fwnode_property_read_string_array(fwnode, "gpio-line-names", |
9427ecbe MW |
37 | NULL, 0); |
38 | if (ret < 0) | |
39 | return; | |
40 | ||
41 | if (ret != gdev->ngpio) { | |
82270335 | 42 | dev_warn(&gdev->dev, |
9427ecbe MW |
43 | "names %d do not match number of GPIOs %d\n", ret, |
44 | gdev->ngpio); | |
45 | return; | |
46 | } | |
47 | ||
48 | names = kcalloc(gdev->ngpio, sizeof(*names), GFP_KERNEL); | |
49 | if (!names) | |
50 | return; | |
51 | ||
82270335 | 52 | ret = fwnode_property_read_string_array(fwnode, "gpio-line-names", |
9427ecbe MW |
53 | names, gdev->ngpio); |
54 | if (ret < 0) { | |
82270335 | 55 | dev_warn(&gdev->dev, "failed to read GPIO line names\n"); |
9427ecbe MW |
56 | kfree(names); |
57 | return; | |
58 | } | |
59 | ||
60 | for (i = 0; i < gdev->ngpio; i++) | |
61 | gdev->descs[i].name = names[i]; | |
62 | ||
63 | kfree(names); | |
64 | } |