drivers/net/wireless/ti/wl18xx/io.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/ti/wl18xx/io.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/ti/wl18xx/io.c
Extension
.c
Size
1088 bytes
Lines
62
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
/*
 * This file is part of wl18xx
 *
 * Copyright (C) 2011 Texas Instruments
 */

#include "../wlcore/wlcore.h"
#include "../wlcore/io.h"

#include "io.h"

int wl18xx_top_reg_write(struct wl1271 *wl, int addr, u16 val)
{
	u32 tmp;
	int ret;

	if (WARN_ON(addr % 2))
		return -EINVAL;

	if ((addr % 4) == 0) {
		ret = wlcore_read32(wl, addr, &tmp);
		if (ret < 0)
			goto out;

		tmp = (tmp & 0xffff0000) | val;
		ret = wlcore_write32(wl, addr, tmp);
	} else {
		ret = wlcore_read32(wl, addr - 2, &tmp);
		if (ret < 0)
			goto out;

		tmp = (tmp & 0xffff) | (val << 16);
		ret = wlcore_write32(wl, addr - 2, tmp);
	}

out:
	return ret;
}

int wl18xx_top_reg_read(struct wl1271 *wl, int addr, u16 *out)
{
	u32 val = 0;
	int ret;

	if (WARN_ON(addr % 2))
		return -EINVAL;

	if ((addr % 4) == 0) {
		/* address is 4-bytes aligned */
		ret = wlcore_read32(wl, addr, &val);
		if (ret >= 0 && out)
			*out = val & 0xffff;
	} else {
		ret = wlcore_read32(wl, addr - 2, &val);
		if (ret >= 0 && out)
			*out = (val & 0xffff0000) >> 16;
	}

	return ret;
}

Annotation

Implementation Notes