drivers/net/wireless/intel/iwlwifi/mvm/led.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/intel/iwlwifi/mvm/led.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/intel/iwlwifi/mvm/led.c
Extension
.c
Size
2756 bytes
Lines
120
Domain
Driver Families
Bucket
drivers/net
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 OR BSD-3-Clause
/*
 * Copyright (C) 2012-2014, 2018-2019, 2025 Intel Corporation
 * Copyright (C) 2017 Intel Deutschland GmbH
 */
#include <linux/leds.h>
#include "iwl-io.h"
#include "iwl-csr.h"
#include "mvm.h"

static void iwl_mvm_send_led_fw_cmd(struct iwl_mvm *mvm, bool on)
{
	struct iwl_led_cmd led_cmd = {
		.status = cpu_to_le32(on),
	};
	struct iwl_host_cmd cmd = {
		.id = WIDE_ID(LONG_GROUP, LEDS_CMD),
		.len = { sizeof(led_cmd), },
		.data = { &led_cmd, },
		.flags = CMD_ASYNC,
	};
	int err;

	if (!iwl_mvm_firmware_running(mvm))
		return;

	err = iwl_mvm_send_cmd(mvm, &cmd);

	if (err)
		IWL_WARN(mvm, "LED command failed: %d\n", err);
}

static void iwl_mvm_led_set(struct iwl_mvm *mvm, bool on)
{
	if (fw_has_capa(&mvm->fw->ucode_capa,
			IWL_UCODE_TLV_CAPA_LED_CMD_SUPPORT)) {
		iwl_mvm_send_led_fw_cmd(mvm, on);
		return;
	}

	iwl_write32(mvm->trans, CSR_LED_REG,
		    on ? CSR_LED_REG_TURN_ON : CSR_LED_REG_TURN_OFF);
}

static void iwl_led_brightness_set(struct led_classdev *led_cdev,
				   enum led_brightness brightness)
{
	struct iwl_mvm *mvm = container_of(led_cdev, struct iwl_mvm, led);

	iwl_mvm_led_set(mvm, brightness > 0);
}

int iwl_mvm_leds_init(struct iwl_mvm *mvm)
{
	int mode = iwlwifi_mod_params.led_mode;
	int ret;

	switch (mode) {
	case IWL_LED_BLINK:
		IWL_ERR(mvm, "Blink led mode not supported, used default\n");
		fallthrough;
	case IWL_LED_DEFAULT:
	case IWL_LED_RF_STATE:
		mode = IWL_LED_RF_STATE;
		break;
	case IWL_LED_DISABLE:
		IWL_INFO(mvm, "Led disabled\n");
		return 0;
	default:
		return -EINVAL;
	}

	mvm->led.name = kasprintf(GFP_KERNEL, "%s-led",
				   wiphy_name(mvm->hw->wiphy));
	if (!mvm->led.name)
		return -ENOMEM;

	mvm->led.brightness_set = iwl_led_brightness_set;
	mvm->led.max_brightness = 1;

	if (mode == IWL_LED_RF_STATE)
		mvm->led.default_trigger =
			ieee80211_get_radio_led_name(mvm->hw);

	ret = led_classdev_register(mvm->trans->dev, &mvm->led);
	if (ret) {
		kfree(mvm->led.name);
		IWL_INFO(mvm, "Failed to enable led\n");
		return ret;
	}

Annotation

Implementation Notes