1// SPDX-License-Identifier: GPL-2.0
2/* Author: Hans de Goede <hdegoede@redhat.com> */
3
4#include <linux/acpi.h>
5#include <linux/gpio/consumer.h>
6#include <linux/leds.h>
7#include "common.h"
8
9static int int3472_pled_set(struct led_classdev *led_cdev,
10				     enum led_brightness brightness)
11{
12	struct int3472_discrete_device *int3472 =
13		container_of(led_cdev, struct int3472_discrete_device, pled.classdev);
14
15	gpiod_set_value_cansleep(int3472->pled.gpio, brightness);
16	return 0;
17}
18
19int skl_int3472_register_pled(struct int3472_discrete_device *int3472,
20			      struct acpi_resource_gpio *agpio, u32 polarity)
21{
22	char *p, *path = agpio->resource_source.string_ptr;
23	int ret;
24
25	if (int3472->pled.classdev.dev)
26		return -EBUSY;
27
28	int3472->pled.gpio = acpi_get_and_request_gpiod(path, agpio->pin_table[0],
29							     "int3472,privacy-led");
30	if (IS_ERR(int3472->pled.gpio))
31		return dev_err_probe(int3472->dev, PTR_ERR(int3472->pled.gpio),
32				     "getting privacy LED GPIO\n");
33
34	if (polarity == GPIO_ACTIVE_LOW)
35		gpiod_toggle_active_low(int3472->pled.gpio);
36
37	/* Ensure the pin is in output mode and non-active state */
38	gpiod_direction_output(int3472->pled.gpio, 0);
39
40	/* Generate the name, replacing the ':' in the ACPI devname with '_' */
41	snprintf(int3472->pled.name, sizeof(int3472->pled.name),
42		 "%s::privacy_led", acpi_dev_name(int3472->sensor));
43	p = strchr(int3472->pled.name, ':');
44	if (p)
45		*p = '_';
46
47	int3472->pled.classdev.name = int3472->pled.name;
48	int3472->pled.classdev.max_brightness = 1;
49	int3472->pled.classdev.brightness_set_blocking = int3472_pled_set;
50
51	ret = led_classdev_register(int3472->dev, &int3472->pled.classdev);
52	if (ret)
53		goto err_free_gpio;
54
55	int3472->pled.lookup.provider = int3472->pled.name;
56	int3472->pled.lookup.dev_id = int3472->sensor_name;
57	int3472->pled.lookup.con_id = "privacy-led";
58	led_add_lookup(&int3472->pled.lookup);
59
60	return 0;
61
62err_free_gpio:
63	gpiod_put(int3472->pled.gpio);
64	return ret;
65}
66
67void skl_int3472_unregister_pled(struct int3472_discrete_device *int3472)
68{
69	if (IS_ERR_OR_NULL(int3472->pled.classdev.dev))
70		return;
71
72	led_remove_lookup(&int3472->pled.lookup);
73	led_classdev_unregister(&int3472->pled.classdev);
74	gpiod_put(int3472->pled.gpio);
75}
76