1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
// 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 <linux/export.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
*
* 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 software node and should not be released
* by the caller.
*/
int devprop_gpiochip_set_names(struct gpio_chip *chip)
{
struct gpio_device *gdev = chip->gpiodev;
struct device *dev = chip->parent;
const char **names;
int ret, i;
int count;
count = device_property_string_array_count(dev, "gpio-line-names");
if (count < 0)
return 0;
if (count > gdev->ngpio) {
dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
count, gdev->ngpio);
count = gdev->ngpio;
}
names = kcalloc(count, sizeof(*names), GFP_KERNEL);
if (!names)
return -ENOMEM;
ret = device_property_read_string_array(dev, "gpio-line-names",
names, count);
if (ret < 0) {
dev_warn(&gdev->dev, "failed to read GPIO line names\n");
kfree(names);
return ret;
}
for (i = 0; i < count; i++)
gdev->descs[i].name = names[i];
kfree(names);
return 0;
}
EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names);
|
