コグノスケ

platform_busのデバイスドライバを登録する

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>

static int sample_platform_probe(struct platform_device *pdev)
{
    return 0;
}

static int sample_platform_remove(struct platform_device *pdev)
{
    return 0;
}

static struct platform_driver hogehoge_driver = {
    .probe  = hogehoge_probe,
    .remove = hogehoge_remove,
    .driver = {
        .name   = "hogehoge"
    },
};

module_platform_driver(hogehoge_driver);

platform_busにデバイスを追加する

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>

static struct platform_device *pdev = NULL;

static int __init hogehoge_device_init(void)
{
    int ret;

    pdev = platform_device_alloc("hogehoge", 0);
    if (pdev == NULL) {
        //error
        return -ENOMEM;
    }

    ret = platform_device_add(pdev);
    if (ret != 0) {
        //error
        platform_device_put(pdev);
        return -ENOMEM;
    }

    return 0;
}

static void __exit hogehoge_device_exit(void)
{
    platform_device_del(pdev);
}

module_init(hogehoge_device_init);
module_exit(hogehoge_device_exit);

- platform_device_add()
  - device_add()
    - bus_probe_device()
      - device_initial_probe()
        - __device_attach()
          - __device_attach_driver()
            - driver_probe_device()
              - really_probe()
                - drv->probe()

- __platform_driver_register()
  - driver_register()
    - bus_add_driver()
      - driver_attach()
        - __driver_attach()
          - driver_probe_device()
            - really_probe()
              - drv->probe()