linux-4.4.1/dma_request_slave_channel() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/dma_request_slave_channel() へ行く。
  • 1 (2016-04-28 (木) 21:40:27)

参照元†

• linux-4.4.1/dmaengine_pcm_new()

説明†

• パス: 複数あり
  • CONFIG_DMA_ENGINE 無効: linux-4.4.1/include/linux/dmaengine.h
  • CONFIG_DMA_ENGINE 有効: linux-4.4.1/drivers/dma/dmaengine.c

• FIXME: これは何？
  • 説明

引数†

• struct device *dev
  • linux-4.4.1/device
  • const char *name

返り値†

• struct dma_chan *
  • linux-4.4.1/dma_chan

参考†

実装†

CONFIG_DMA_ENGINE 無効: include/linux/dmaengine.h†

static inline struct dma_chan *dma_request_slave_channel(struct device *dev,
                                                         const char *name)
{
        return NULL;
}

CONFIG_DMA_ENGINE 有効: drivers/dma/dmaengine.c†

/**
 * dma_request_slave_channel - try to allocate an exclusive slave channel
 * @dev:        pointer to client device structure
 * @name:       slave channel name
 *
 * Returns pointer to appropriate DMA channel on success or NULL.
 */
struct dma_chan *dma_request_slave_channel(struct device *dev,
                                           const char *name)
{
        struct dma_chan *ch = dma_request_slave_channel_reason(dev, name);
        if (IS_ERR(ch))
                return NULL;

• • linux-4.4.1/dma_chan
  • linux-4.4.1/dma_request_slave_channel_reason()
  • linux-4.4.1/IS_ERR()

        dma_cap_set(DMA_PRIVATE, ch->device->cap_mask);
        ch->device->privatecnt++;

• • linux-4.4.1/dma_cap_set()

        return ch;
}
EXPORT_SYMBOL_GPL(dma_request_slave_channel);

• • linux-4.4.1/EXPORT_SYMBOL_GPL()

コメント†