1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Device property helpers for GPIO chips.
 4 *
 5 * Copyright (C) 2016, Intel Corporation
 6 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
 
 
 
 
 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#include <linux/export.h>
14
15#include "gpiolib.h"
16
17/**
18 * devprop_gpiochip_set_names - Set GPIO line names using device properties
19 * @chip: GPIO chip whose lines should be named, if possible
20 * @fwnode: Property Node containing the gpio-line-names property
21 *
22 * Looks for device property "gpio-line-names" and if it exists assigns
23 * GPIO line names for the chip. The memory allocated for the assigned
24 * names belong to the underlying firmware node and should not be released
25 * by the caller.
26 */
27void devprop_gpiochip_set_names(struct gpio_chip *chip,
28				const struct fwnode_handle *fwnode)
29{
30	struct gpio_device *gdev = chip->gpiodev;
31	const char **names;
32	int ret, i;
33	int count;
34
35	count = fwnode_property_read_string_array(fwnode, "gpio-line-names",
36						  NULL, 0);
37	if (count < 0)
38		return;
 
39
40	if (count > gdev->ngpio) {
41		dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
42			 count, gdev->ngpio);
43		count = gdev->ngpio;
 
 
 
 
 
 
44	}
45
46	names = kcalloc(count, sizeof(*names), GFP_KERNEL);
47	if (!names)
48		return;
49
50	ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
51						names, count);
52	if (ret < 0) {
53		dev_warn(&gdev->dev, "failed to read GPIO line names\n");
54		kfree(names);
55		return;
56	}
57
58	for (i = 0; i < count; i++)
59		gdev->descs[i].name = names[i];
60
61	kfree(names);
62}
63EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names);

 
 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 */
28void 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
34	if (!chip->parent) {
35		dev_warn(&gdev->dev, "GPIO chip parent is NULL\n");
 
36		return;
37	}
38
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}