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// SPDX-License-Identifier: ISC
/*
* 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 data_len)
{
const struct mt76_mcu_ops *ops = dev->mcu_ops;
int length = ops->headroom + data_len + ops->tailroom;
struct sk_buff *skb;
skb = alloc_skb(length, GFP_KERNEL);
if (!skb)
return NULL;
memset(skb->head, 0, length);
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 long expires;
int ret, seq;
if (ret_skb)
*ret_skb = NULL;
mutex_lock(&dev->mcu.mutex);
ret = dev->mcu_ops->mcu_skb_send_msg(dev, skb, cmd, &seq);
if (ret < 0)
goto out;
if (!wait_resp) {
ret = 0;
goto out;
}
expires = jiffies + dev->mcu.timeout;
do {
skb = mt76_mcu_get_response(dev, expires);
ret = dev->mcu_ops->mcu_parse_response(dev, cmd, skb, seq);
if (!ret && ret_skb)
*ret_skb = skb;
else
dev_kfree_skb(skb);
} while (ret == -EAGAIN);
out:
mutex_unlock(&dev->mcu.mutex);
return ret;
}
EXPORT_SYMBOL_GPL(mt76_mcu_skb_send_and_get_msg);
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