drivers/platform/x86/intel/int3472/led.c

Source file repositories/reference/linux-study-clean/drivers/platform/x86/intel/int3472/led.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/x86/intel/int3472/led.c
Extension
.c
Size
1637 bytes
Lines
64
Domain
Driver Families
Bucket
drivers/platform
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/* Author: Hans de Goede <hdegoede@redhat.com> */

#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/leds.h>
#include <linux/platform_data/x86/int3472.h>

static int int3472_led_set(struct led_classdev *led_cdev, enum led_brightness brightness)
{
	struct int3472_led *led = container_of(led_cdev, struct int3472_led, classdev);

	gpiod_set_value_cansleep(led->gpio, brightness);
	return 0;
}

int skl_int3472_register_led(struct int3472_discrete_device *int3472, struct gpio_desc *gpio,
			     const char *con_id)
{
	struct int3472_led *led;
	char *p;
	int ret;

	if (int3472->n_leds >= INT3472_MAX_LEDS)
		return -ENOSPC;

	led = &int3472->leds[int3472->n_leds];
	led->gpio = gpio;

	/* Generate the name, replacing the ':' in the ACPI devname with '_' */
	snprintf(led->name, sizeof(led->name),
		 "%s::%s_led", acpi_dev_name(int3472->sensor), con_id);
	p = strchr(led->name, ':');
	if (p)
		*p = '_';

	led->classdev.name = led->name;
	led->classdev.max_brightness = 1;
	led->classdev.brightness_set_blocking = int3472_led_set;

	ret = led_classdev_register(int3472->dev, &led->classdev);
	if (ret)
		return ret;

	led->lookup.provider = led->name;
	led->lookup.dev_id = int3472->sensor_name;
	led->lookup.con_id = con_id;
	led_add_lookup(&led->lookup);

	int3472->n_leds++;
	return 0;
}

void skl_int3472_unregister_leds(struct int3472_discrete_device *int3472)
{
	for (unsigned int i = 0; i < int3472->n_leds; i++) {
		struct int3472_led *led = &int3472->leds[i];

		led_remove_lookup(&led->lookup);
		led_classdev_unregister(&led->classdev);
		gpiod_put(led->gpio);
	}
}

Annotation

Implementation Notes