firmware

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/firmware.h>
#include <linux/timer.h>
#include <linux/workqueue.h>

struct driver_data {
    struct i2c_client *client;
    struct workqueue_struct *wq;
    struct work_struct work;
};

static struct driver_data *ddata;
static struct timer_list timer;

static void fw_work(void)
{
    int ret = 0;
    struct firmware *fw;

    printk("-- %s --\n", __FUNCTION__);

    /* 调度一个work来做 */
    ret = request_firmware(&fw, "test.bin", &ddata->client->dev);  //可以自设路径, 如/mark/test.bin

    if (ret != 0) {
        printk("--- error ---\n");
        return;
    }
    printk("fw->size = %d, fw->data = %s\n", fw->size, fw->data);

    release_firmware(fw);

    return;
}

static void fw_update(void)
{
    printk("-- %s --\n", __FUNCTION__);

    queue_work(ddata->wq, &ddata->work);

    return;
}

static __devinit int fw_probe(struct i2c_client *client,
        const struct i2c_device_id *id)
{
    printk("%s\n", __FUNCTION__);

    ddata = kzalloc(sizeof(struct driver_data), GFP_KERNEL);

    ddata->client = client;

    INIT_WORK(&ddata->work, fw_work);
    ddata->wq = create_singlethread_workqueue("bin");

    init_timer(&timer);
    timer.data = 0;
    timer.expires = jiffies + 20 * HZ;
    timer.function = &fw_update;
    add_timer(&timer);

    return 0;
}

static const struct i2c_device_id fw_id[] = {
    {"bin", 0},
    {},
};

static struct i2c_board_info i2c_info = {
    .type = "bin",
    .addr = 0x40,
};

struct i2c_driver fw_driver = {
    .driver = {
        .name = "bin",
        .owner = THIS_MODULE,
    },
    .probe = fw_probe,
    .id_table = fw_id,
};

static int __init fw_init(void)
{
    struct i2c_adapter *adapter;

    printk("%s\n", __FUNCTION__);

    adapter = i2c_get_adapter(0);
    if (!adapter) {
        printk("error : %d\n", __LINE__);
        return -1;
    }

    i2c_new_device(adapter, &i2c_info);

    i2c_put_adapter(adapter);

    i2c_add_driver(&fw_driver);

    return 0;
}

static void __exit fw_exit(void)
{
    return;
}

module_init(fw_init);
module_exit(fw_exit);

在目标机中加入文件

#vi /lib/firmware/test.bin      #输入hello！

可以在目标机shell中看到如下信息

-- fw_update --
-- fw_work --
bin 0-0040: firmware: requesting test.bin
fw->size = 7, fw->data = hello!