drivers/net/wireless/mediatek/mt76/mcu.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/mediatek/mt76/mcu.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/mcu.c
Extension
.c
Size
3669 bytes
Lines
162
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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: BSD-3-Clause-Clear
/*
 * Copyright (C) 2019 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
 */

#include "mt76.h"

struct sk_buff *
__mt76_mcu_msg_alloc(struct mt76_dev *dev, const void *data,
		     int len, int data_len, gfp_t gfp)
{
	const struct mt76_mcu_ops *ops = dev->mcu_ops;
	struct sk_buff *skb;

	len = max_t(int, len, data_len);
	len = ops->headroom + len + ops->tailroom;

	skb = alloc_skb(len, gfp);
	if (!skb)
		return NULL;

	memset(skb->head, 0, len);
	skb_reserve(skb, ops->headroom);

	if (data && data_len)
		skb_put_data(skb, data, data_len);

	return skb;
}
EXPORT_SYMBOL_GPL(__mt76_mcu_msg_alloc);

struct sk_buff *mt76_mcu_get_response(struct mt76_dev *dev,
				      unsigned long expires)
{
	unsigned long timeout;

	if (!time_is_after_jiffies(expires))
		return NULL;

	timeout = expires - jiffies;
	wait_event_timeout(dev->mcu.wait,
			   (!skb_queue_empty(&dev->mcu.res_q) ||
			    test_bit(MT76_MCU_RESET, &dev->phy.state)),
			   timeout);
	return skb_dequeue(&dev->mcu.res_q);
}
EXPORT_SYMBOL_GPL(mt76_mcu_get_response);

void mt76_mcu_rx_event(struct mt76_dev *dev, struct sk_buff *skb)
{
	skb_queue_tail(&dev->mcu.res_q, skb);
	wake_up(&dev->mcu.wait);
}
EXPORT_SYMBOL_GPL(mt76_mcu_rx_event);

int mt76_mcu_send_and_get_msg(struct mt76_dev *dev, int cmd, const void *data,
			      int len, bool wait_resp, struct sk_buff **ret_skb)
{
	struct sk_buff *skb;

	if (dev->mcu_ops->mcu_send_msg)
		return dev->mcu_ops->mcu_send_msg(dev, cmd, data, len, wait_resp);

	skb = mt76_mcu_msg_alloc(dev, data, len);
	if (!skb)
		return -ENOMEM;

	return mt76_mcu_skb_send_and_get_msg(dev, skb, cmd, wait_resp, ret_skb);
}
EXPORT_SYMBOL_GPL(mt76_mcu_send_and_get_msg);

int mt76_mcu_skb_send_and_get_msg(struct mt76_dev *dev, struct sk_buff *skb,
				  int cmd, bool wait_resp,
				  struct sk_buff **ret_skb)
{
	unsigned int retry = 0;
	struct sk_buff *orig_skb = NULL;
	unsigned long expires;
	int ret, seq;

	if (mt76_is_sdio(dev))
		if (test_bit(MT76_RESET, &dev->phy.state) && atomic_read(&dev->bus_hung))
			return -EIO;

	if (ret_skb)
		*ret_skb = NULL;

	mutex_lock(&dev->mcu.mutex);

	if (dev->mcu_ops->mcu_skb_prepare_msg) {

Annotation

Implementation Notes