drivers/net/wireless/realtek/rtl818x/rtl8180/grf5101.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/realtek/rtl818x/rtl8180/grf5101.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/realtek/rtl818x/rtl8180/grf5101.c
Extension
.c
Size
4939 bytes
Lines
188
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

/*
 * Radio tuning for GCT GRF5101 on RTL8180
 *
 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
 *
 * Code from the BSD driver and the rtl8181 project have been
 * very useful to understand certain things
 *
 * I want to thanks the Authors of such projects and the Ndiswrapper
 * project Authors.
 *
 * A special Big Thanks also is for all people who donated me cards,
 * making possible the creation of the original rtl8180 driver
 * from which this code is derived!
 */

#include <linux/pci.h>
#include <linux/delay.h>
#include <net/mac80211.h>

#include "rtl8180.h"
#include "grf5101.h"

static const int grf5101_encode[] = {
	0x0, 0x8, 0x4, 0xC,
	0x2, 0xA, 0x6, 0xE,
	0x1, 0x9, 0x5, 0xD,
	0x3, 0xB, 0x7, 0xF
};

static void write_grf5101(struct ieee80211_hw *dev, u8 addr, u32 data)
{
	struct rtl8180_priv *priv = dev->priv;
	u32 phy_config;

	phy_config =  grf5101_encode[(data >> 8) & 0xF];
	phy_config |= grf5101_encode[(data >> 4) & 0xF] << 4;
	phy_config |= grf5101_encode[data & 0xF] << 8;
	phy_config |= grf5101_encode[(addr >> 1) & 0xF] << 12;
	phy_config |= (addr & 1) << 16;
	phy_config |= grf5101_encode[(data & 0xf000) >> 12] << 24;

	/* MAC will bang bits to the chip */
	phy_config |= 0x90000000;

	rtl818x_iowrite32(priv,
		(__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);

	msleep(3);
}

static void grf5101_write_phy_antenna(struct ieee80211_hw *dev, short chan)
{
	struct rtl8180_priv *priv = dev->priv;
	u8 ant = GRF5101_ANTENNA;

	if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
		ant |= BB_ANTENNA_B;

	if (chan == 14)
		ant |= BB_ANTATTEN_CHAN14;

	rtl8180_write_phy(dev, 0x10, ant);
}

static u8 grf5101_rf_calc_rssi(u8 agc, u8 sq)
{
	if (agc > 60)
		return 65;

	/* TODO(?): just return agc (or agc + 5) to avoid mult / div */
	return 65 * agc / 60;
}

static void grf5101_rf_set_channel(struct ieee80211_hw *dev,
				   struct ieee80211_conf *conf)
{
	struct rtl8180_priv *priv = dev->priv;
	int channel =
		ieee80211_frequency_to_channel(conf->chandef.chan->center_freq);
	u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
	u32 chan = channel - 1;

	/* set TX power */
	write_grf5101(dev, 0x15, 0x0);
	write_grf5101(dev, 0x06, txpw);
	write_grf5101(dev, 0x15, 0x10);
	write_grf5101(dev, 0x15, 0x0);

Annotation

Implementation Notes