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
int3472_pled_set(struct led_classdev * led_cdev,enum led_brightness brightness)9 static 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
skl_int3472_register_pled(struct int3472_discrete_device * int3472,struct acpi_resource_gpio * agpio,u32 polarity)19 int 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
62 err_free_gpio:
63 gpiod_put(int3472->pled.gpio);
64 return ret;
65 }
66
skl_int3472_unregister_pled(struct int3472_discrete_device * int3472)67 void 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