linux device常用的管理机制

最新推荐文章于 2024-12-06 15:08:04 发布

原创最新推荐文章于 2024-12-06 15:08:04 发布 · 376 阅读

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本文介绍了用于I2C通信的设备结构`struct qup_i2c_dev`，该结构包含设备指针、寄存器基址、中断号、适配器结构等关键字段，并展示了如何为这种类型的设备分配内存及初始化部分成员。

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struct qup_i2c_dev {
	struct device                *dev;
	void __iomem                 *base;		/* virtual */
	void __iomem                 *gsbi;		/* virtual */
	int                          in_irq;
	int                          out_irq;
	int                          err_irq;
	int                          num_irqs;
	struct clk                   *clk;
	struct clk                   *pclk;
	struct i2c_adapter           adapter;

	struct i2c_msg               *msg;
	int                          pos;
	int                          cnt;
	int                          err;
	int                          mode;
	int                          clk_ctl;
	int                          one_bit_t;
	int                          out_fifo_sz;
	int                          in_fifo_sz;
	int                          out_blk_sz;
	int                          in_blk_sz;
	int                          wr_sz;
	struct msm_i2c_platform_data *pdata;
	enum msm_i2c_state           pwr_state;
	struct mutex                 mlock;
	void                         *complete;
	int                          i2c_gpios[ARRAY_SIZE(i2c_rsrcs)];
	struct qup_i2c_clk_path_vote clk_path_vote;
};

struct platform_device {
	const char	* name;
	int		id;
	struct device	dev;
	u32		num_resources;
	struct resource	* resource;

	const struct platform_device_id	*id_entry;

	/* MFD cell pointer */
	struct mfd_cell *mfd_cell;

	/* arch specific additions */
	struct pdev_archdata	archdata;
};

struct qup_i2c_dev *dev;

dev = kzalloc(sizeof(struct qup_i2c_dev), GFP_KERNEL);

dev->dev = &pdev->dev;

struct qup_i2c_dev {struct device *dev;void __iomem *base; /* virtual */void __iomem *gsbi; /* virtual */int in_irq;int out_irq;int err_irq;int num_irqs;struct clk *clk;struct clk *pclk;struct i2c_adapter adapter;struct i2c_msg *msg;int pos;int cnt;int err;int mode;int clk_ctl;int one_bit_t;int out_fifo_sz;int in_fifo_sz;int out_blk_sz;int in_blk_sz;int wr_sz;struct msm_i2c_platform_data *pdata;enum msm_i2c_state pwr_state;struct mutex mlock;void *complete;int i2c_gpios[ARRAY_SIZE(i2c_rsrcs)];struct qup_i2c_clk_path_vote clk_path_vote;};