Linux之platform平台设备驱动详解

struct platform_driver {
	int (*probe)(struct platform_device *);

	/*
	 * Traditionally the remove callback returned an int which however is
	 * ignored by the driver core. This led to wrong expectations by driver
	 * authors who thought returning an error code was a valid error
	 * handling strategy. To convert to a callback returning void, new
	 * drivers should implement .remove_new() until the conversion it done
	 * that eventually makes .remove() return void.
	 */
	int (*remove)(struct platform_device *);
	void (*remove_new)(struct platform_device *);

	void (*shutdown)(struct platform_device *);
	int (*suspend)(struct platform_device *, pm_message_t state);
	int (*resume)(struct platform_device *);
	struct device_driver driver;
	const struct platform_device_id *id_table;
	bool prevent_deferred_probe;
	/*
	 * For most device drivers, no need to care about this flag as long as
	 * all DMAs are handled through the kernel DMA API. For some special
	 * ones, for example VFIO drivers, they know how to manage the DMA
	 * themselves and set this flag so that the IOMMU layer will allow them
	 * to setup and manage their own I/O address space.
	 */
	bool driver_managed_dma;
};

int zsl_drv_probe(struct platform_device *dev)
{
	struct property *pp = NULL;

	printk(KERN_INFO "%s: \n",__func__);

	dump_stack();  // 打印堆栈

    return 0;
}

int zsl_drv_remove(struct platform_device *dev)
{
	printk(KERN_INFO "%s: \n",__func__);
    return 0;
}

struct platform_driver zsl_drv =
{
    .driver =
    {
        .name = "zsltest",			
    },
     
    .probe = zsl_drv_probe,
    .remove = zsl_drv_remove,
};

struct platform_device {
	const char	*name;
	int		id;
	bool		id_auto;
	struct device	dev;
	u64		platform_dma_mask;
	struct device_dma_parameters dma_parms;
	u32		num_resources;
	struct resource	*resource;

	const struct platform_device_id	*id_entry;
	/*
	 * Driver name to force a match.  Do not set directly, because core
	 * frees it.  Use driver_set_override() to set or clear it.
	 */
	const char *driver_override;

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

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

struct platform_device zsl_dev =
{
    .name = "zsltest",
    .dev =
    {
        .release = zsl_dev_release,
    },
};

       zsl: zsl {
              compatible = "rockchip,zslzsl";
              status = "okay";
              testdata = "test";
       };

int zsl_drv_probe(struct platform_device *dev)
{
       struct property *pp = NULL;

       printk(KERN_INFO "%s: \n",__func__);

       pp = of_find_property(dev->dev.of_node, "testdata", NULL);
       if (pp)
              printk(KERN_INFO "%s: %d:%s \n",__func__,pp->length,(char *)pp->value);

       dump_stack();  // 打印堆栈

    return 0;
}

platform_driver_register
    driver_register 
        bus_add_driver   
            klist_add_tail
            driver_attach
                driver_match_device(struct device *dev, void *data)=platform_match(struct device *dev, struct device_driver *drv) //找dev
                driver_probe_device
                    really_probe
                        dev->bus->probe=platform_probe
                            drv->probe=zsl_drv_probe

platform_device_register
    platform_device_add
        device_add
            bus_probe_device
                device_initial_probe=__device_attach
                    __device_attach_driver
                        driver_match_device(struct device *dev, void *data)=platform_match(struct device *dev, struct device_driver *drv)  //找drv
                        driver_probe_device
                            really_probe
                                dev->bus->probe=platform_probe
                                    drv->probe=zsl_drv_probe
            klist_add_tail