linux spi 应用层

#include <linux/module.h>
#include <linux/spi/spidev.h>
#include <linux/kernel.h>
#include <linux/init.h>

static struct spi_device *spi_dev;

static int spi_transfer(struct spi_device *spi, struct spi_message *msg)
{
    int ret;
    ret = spi_sync(spi, msg);
    if (ret < 0)
        printk(KERN_ERR "SPI transfer failed: %d\n", ret);
    return ret;
}

static int __init spi_init(void)
{
    struct spi_board_info spi_board_info = {
        .modalias = "spidev",
        .max_speed_hz = 500000,
        .bus_num = 0,
        .chip_select = 0,
    };

    spi_dev = spi_new_device(spi_busnum_to_master(0), &spi_board_info);
    if (!spi_dev) {
        printk(KERN_ERR "Failed to create SPI device\n");
        return -ENODEV;
    }

    printk(KERN_INFO "SPI device initialized successfully\n");
    return 0;
}

static void __exit spi_exit(void)
{
    spi_unregister_device(spi_dev);
    printk(KERN_INFO "SPI device unregistered\n");
}

module_init(spi_init);
module_exit(spi_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("A simple SPI driver example");