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

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

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/intel/iwlwifi/dvm/led.c
Extension
.c
Size
5339 bytes
Lines
209
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-only
/******************************************************************************
 *
 * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
 * Copyright (C) 2019, 2025 Intel Corporation
 *****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <net/mac80211.h>
#include <linux/etherdevice.h>
#include <linux/unaligned.h>
#include "iwl-io.h"
#include "iwl-trans.h"
#include "iwl-modparams.h"
#include "dev.h"
#include "agn.h"

/* Throughput		OFF time(ms)	ON time (ms)
 *	>300			25		25
 *	>200 to 300		40		40
 *	>100 to 200		55		55
 *	>70 to 100		65		65
 *	>50 to 70		75		75
 *	>20 to 50		85		85
 *	>10 to 20		95		95
 *	>5 to 10		110		110
 *	>1 to 5			130		130
 *	>0 to 1			167		167
 *	<=0					SOLID ON
 */
static const struct ieee80211_tpt_blink iwl_blink[] = {
	{ .throughput = 0, .blink_time = 334 },
	{ .throughput = 1 * 1024 - 1, .blink_time = 260 },
	{ .throughput = 5 * 1024 - 1, .blink_time = 220 },
	{ .throughput = 10 * 1024 - 1, .blink_time = 190 },
	{ .throughput = 20 * 1024 - 1, .blink_time = 170 },
	{ .throughput = 50 * 1024 - 1, .blink_time = 150 },
	{ .throughput = 70 * 1024 - 1, .blink_time = 130 },
	{ .throughput = 100 * 1024 - 1, .blink_time = 110 },
	{ .throughput = 200 * 1024 - 1, .blink_time = 80 },
	{ .throughput = 300 * 1024 - 1, .blink_time = 50 },
};

/* Set led register off */
void iwlagn_led_enable(struct iwl_priv *priv)
{
	iwl_write32(priv->trans, CSR_LED_REG, CSR_LED_REG_TURN_ON);
}

/*
 * Adjust led blink rate to compensate on a MAC Clock difference on every HW
 * Led blink rate analysis showed an average deviation of 20% on 5000 series
 * and up.
 * Need to compensate on the led on/off time per HW according to the deviation
 * to achieve the desired led frequency
 * The calculation is: (100-averageDeviation)/100 * blinkTime
 * For code efficiency the calculation will be:
 *     compensation = (100 - averageDeviation) * 64 / 100
 *     NewBlinkTime = (compensation * BlinkTime) / 64
 */
static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
				    u8 time, u16 compensation)
{
	if (!compensation) {
		IWL_ERR(priv, "undefined blink compensation: "
			"use pre-defined blinking time\n");
		return time;
	}

	return (u8)((time * compensation) >> 6);
}

static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
{
	struct iwl_host_cmd cmd = {
		.id = REPLY_LEDS_CMD,
		.len = { sizeof(struct iwl_led_cmd), },
		.data = { led_cmd, },
		.flags = CMD_ASYNC,
	};
	u32 reg;

	reg = iwl_read32(priv->trans, CSR_LED_REG);
	if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
		iwl_write32(priv->trans, CSR_LED_REG,

Annotation

Implementation Notes