高通平台spi测试示例代码

以下是高通平台 SPI 测试示例代码，供参考：

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/spi/spi.h>
#include <linux/delay.h>
#include <linux/slab.h>

#define SPI_DEVICE_NAME "spi_test_device"
#define SPI_DEVICE_MINOR 0

static struct spi_device *spi_dev;

static int spi_test_open(struct inode *inode, struct file *file)
{
    printk(KERN_INFO "SPI Test Device Opened\n");
    return 0;
}

static int spi_test_close(struct inode *inode, struct file *file)
{
    printk(KERN_INFO "SPI Test Device Closed\n");
    return 0;
}

static ssize_t spi_test_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
    printk(KERN_INFO "SPI Test Device Read\n");
    return 0;
}

static ssize_t spi_test_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
    printk(KERN_INFO "SPI Test Device Write\n");
    return count;
}

static const struct file_operations spi_test_fops = {
    .owner = THIS_MODULE,
    .open = spi_test_open,
    .release = spi_test_close,
    .read = spi_test_read,
    .write = spi_test_write,
};

static int spi_test_probe(struct spi_device *dev)
{
    int ret;

    printk(KERN_INFO "SPI Test Device Probed\n");

    spi_dev = dev;

    ret = alloc_chrdev_region(&dev_num, SPI_DEVICE_MINOR, 1, SPI_DEVICE_NAME);
    if (ret) {
        printk(KERN_ERR "Failed to register SPI Test Device: %d\n", ret);
        return ret;
    }

    cdev_init(&c_dev, &spi_test_fops);
    c_dev.owner = THIS_MODULE;
    c_dev.ops = &spi_test_fops;

    ret = cdev_add(&c_dev, dev_num, 1);
    if (ret) {
        printk(KERN_ERR "Failed to add SPI Test Device: %d\n", ret);
        unregister_chrdev_region(dev_num, 1);
        return ret;
    }

    return 0;
}

static int spi_test_remove(struct spi_device *dev)
{
    printk(KERN_INFO "SPI Test Device Removed\n");

    cdev_del(&c_dev);
    unregister_chrdev_region(dev_num, 1);

    return 0;
}

static struct spi_driver spi_test_driver = {
    .driver = {
        .name = "spi_test",
        .owner = THIS_MODULE,
    },
    .probe = spi_test_probe,
    .remove = spi_test_remove,
};

static int __init spi_test_init(void)
{
    int ret;

    printk(KERN_INFO "Initializing SPI Test Device\n");

    ret = spi_register_driver(&spi_test_driver);
    if (ret) {
        printk(KERN_ERR "Failed to register SPI Test Driver: %d\n", ret);
        return ret;
    }

    return 0;
}

static void __exit spi_test_exit(void)
{
    printk(KERN_INFO "Exiting SPI Test Device\n");

    spi_unregister_driver(&spi_test_driver);
}

module_init(spi_test_init);
module_exit(spi_test_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("SPI Test Device Driver");

这是一个简单的 SPI 设备驱动程序，它创建一个名为 `spi_test_device` 的字符设备，并在 probe 函数中将其与 SPI 设备进行关联。在此之后，您可以使用标准的字符设备读写函数来与 SPI 设备进行通信。