ADC16DV160 的 Xilinx FPGA 驱动代码

以下是 ADC16DV160 的 Xilinx FPGA 驱动代码的一个简单示例，可以根据实际情况进行修改：

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/spi/spi.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/uaccess.h>

/* ADC16DV160 commands */
#define ADC16DV160_CMD_RESET    0x01
#define ADC16DV160_CMD_CONFIG   0x02
#define ADC16DV160_CMD_START    0x03
#define ADC16DV160_CMD_STOP     0x04
#define ADC16DV160_CMD_READ     0x05

/* ADC16DV160 configuration structure */
struct adc16dv160_config {
    u8 mode;        /* ADC16DV160 mode */
    u8 channels;    /* Number of channels to sample */
    u32 rate;       /* Sampling rate */
};

/* ADC16DV160 device structure */
struct adc16dv160_dev {
    struct spi_device *spi;
    struct cdev cdev;
    dev_t devnum;
    struct class *class;
    struct device *device;
    struct adc16dv160_config config;
    u8 *sample_buffer;
    u32 sample_count;
    u8 running;
    wait_queue_head_t waitq;
    struct task_struct *task;
};

/* ADC16DV160 driver structure */
struct adc16dv160_driver {
    struct spi_driver spi_driver;
};

/* ADC16DV160 driver instance */
static struct adc16dv160_driver adc16dv160_driver;

/* ADC16DV160 device instance */
static struct adc16dv160_dev *adc16dv160_dev;

/* ADC16DV160 transfer function */
static int adc16dv160_transfer(struct adc16dv160_dev *dev, u8 *tx, u8 *rx, size_t len)
{
    struct spi_transfer transfer = {
        .tx_buf = tx,
        .rx_buf = rx,
        .len = len,
        .delay_usecs = 1,
    };
    return spi_sync_transfer(dev->spi, &transfer, 1);
}

/* ADC16DV160 reset */
static int adc16dv160_reset(struct adc16dv160_dev *dev)
{
    u8 cmd = ADC16DV160_CMD_RESET;
    return adc16dv160_transfer(dev, &cmd, NULL, 1);
}

/* ADC16DV160 configure */
static int adc16dv160_configure(struct adc16dv160_dev *dev)
{
    u8 cmd[5];
    cmd[0] = ADC16DV160_CMD_CONFIG;
    cmd[1] = dev->config.mode;
    cmd[2] = dev->config.channels;
    cmd[3] = (dev->config.rate >> 16) & 0xFF;
    cmd[4] = (dev->config.rate >> 8) & 0xFF;
    return adc16dv160_transfer(dev, cmd, NULL, 5);
}

/* ADC16DV160 start */
static int adc16dv160_start(struct adc16dv160_dev *dev)
{
    u8 cmd = ADC16DV160_CMD_START;
    return adc16dv160_transfer(dev, &cmd, NULL, 1);
}

/* ADC16DV160 stop */
static int adc16dv160_stop(struct adc16dv160_dev *dev)
{
    u8 cmd = ADC16DV160_CMD_STOP;
    return adc16dv160_transfer(dev, &cmd, NULL, 1);
}

/* ADC16DV160 read */
static int adc16dv160_read(struct adc16dv160_dev *dev, u8 *rx, size_t len)
{
    u8 cmd = ADC16DV160_CMD_READ;
    return adc16dv160_transfer(dev, &cmd, rx, len);
}

/* ADC16DV160 sampling task */
static int adc16dv160_task(void *data)
{
    struct adc16dv160_dev *dev = data;
    int ret;

    while (!kthread_should_stop()) {
        /* Start ADC16DV160 */
        ret = adc16dv160_start(dev);
        if (ret < 0)
            goto out;
        dev->running = 1;

        /* Wait for samples */
        wait_event_interruptible(dev->waitq, dev->running == 0);

        /* Stop ADC16DV160 */
        ret = adc16dv160_stop(dev);
        if (ret < 0)
            goto out;
        dev->running = 0;

        /* Read samples */
        ret = adc16dv160_read(dev, dev->sample_buffer, dev->sample_count);
        if (ret < 0)
            goto out;

        /* Copy samples to user space */
        if (copy_to_user((void __user *)dev->cdev.write, dev->sample_buffer, dev->sample_count)) {
            ret = -EFAULT;
            goto out;
        }
    }

out:
    return ret;
}

/* ADC16DV160 device open */
static int adc16dv160_open(struct inode *inode, struct file *file)
{
    struct adc16dv160_dev *dev = container_of(inode->i_cdev, struct adc16dv160_dev, cdev);
    file->private_data = dev;
    return 0;
}

/* ADC16DV160 device release */
static int adc16dv160_release(struct inode *inode, struct file *file)
{
    return 0;
}

/* ADC16DV160 device read */
static ssize_t adc16dv160_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
{
    struct adc16dv160_dev *dev = file->private_data;

    /* Set sample buffer and count */
    dev->sample_buffer = kmalloc(count, GFP_KERNEL);
    if (!dev->sample_buffer)
        return -ENOMEM;
    dev->sample_count = count;

    /* Wake up sampling task */
    wake_up_interruptible(&dev->waitq);

    return 0;
}

/* ADC16DV160 driver probe */
static int adc16dv160_probe(struct spi_device *spi)
{
    int ret;
    dev_t devnum;
    struct device *device;
    struct adc16dv160_dev *dev;

    /* Allocate device */
    dev = kzalloc(sizeof(struct adc16dv160_dev), GFP_KERNEL);
    if (!dev)
        return -ENOMEM;

    /* Initialize device */
    dev->spi = spi;
    init_waitqueue_head(&dev->waitq);

    /* Reset ADC16DV160 */
    ret = adc16dv160_reset(dev);
    if (ret < 0)
        goto error;

    /* Configure ADC16DV160 */
    dev->config.mode = 0x01; /* Single-ended mode */
    dev->config.channels = 0x01; /* Channel 0 */
    dev->config.rate = 1000000; /* 1MHz */
    ret = adc16dv160_configure(dev);
    if (ret < 0)
        goto error;

    /* Allocate device number */
    ret = alloc_chrdev_region(&devnum, 0, 1, "adc16dv160");
    if (ret < 0)
        goto error;
    dev->devnum = devnum;

    /* Initialize character device */
    cdev_init(&dev->cdev, &adc16dv160_fops);
    dev->cdev.owner = THIS_MODULE;
    ret = cdev_add(&dev->cdev, dev->devnum, 1);
    if (ret < 0)
        goto error;

    /* Create device class and device */
    dev->class = class_create(THIS_MODULE, "adc16dv160");
    if (IS_ERR(dev->class)) {
        ret = PTR_ERR(dev->class);
        goto error;
    }
    device = device_create(dev->class, NULL, dev->devnum, NULL, "adc16dv160");
    if (IS_ERR(device)) {
        ret = PTR_ERR(device);
        goto error;
    }
    dev->device = device;

    /* Create sampling task */
    dev->task = kthread_create(adc16dv160_task, dev, "adc16dv160_task");
    if (IS_ERR(dev->task)) {
        ret = PTR_ERR(dev->task);
        goto error;
    }
    wake_up_process(dev->task);

    /* Register device */
    adc16dv160_dev = dev;

    return 0;

error:
    if (dev->task)
        kthread_stop(dev->task);
    if (dev->device)
        device_destroy(dev->class, dev->devnum);
    if (dev->class)
        class_destroy(dev->class);
    if (dev->devnum)
        unregister_chrdev_region(dev->devnum, 1);
    if (dev->sample_buffer)
        kfree(dev->sample_buffer);
    kfree(dev);
    return ret;
}

/* ADC16DV160 driver remove */
static int adc16dv160_remove(struct spi_device *spi)
{
    struct adc16dv160_dev *dev = adc16dv160_dev;

    /* Stop sampling task */
    kthread_stop(dev->task);

    /* Unregister device */
    device_destroy(dev->class, dev->devnum);
    class_destroy(dev->class);
    unregister_chrdev_region(dev->devnum, 1);

    /* Free sample buffer */
    kfree(dev->sample_buffer);

    /* Free device */
    kfree(dev);

    /* Clear device instance */
    adc16dv160_dev = NULL;

    return 0;
}

/* ADC16DV160 driver SPI driver structure */
static struct spi_driver adc16dv160_spi_driver = {
    .driver = {
        .name = "adc16dv160",
        .owner = THIS_MODULE,
    },
    .probe = adc16dv160_probe,
    .remove = adc16dv160_remove,
};

/* ADC16DV160 driver file operations */
static struct file_operations adc16dv160_fops = {
    .owner = THIS_MODULE,
    .open = adc16dv160_open,
    .release = adc16dv160_release,
    .read = adc16dv160_read,
};

/* ADC16DV160 driver initialization */
static int __init adc16dv160_init(void)
{
    int ret;

    /* Register SPI driver */
    ret = spi_register_driver(&adc16dv160_spi_driver);
    if (ret < 0)
        return ret;

    return 0;
}

/* ADC16DV160 driver cleanup */
static void __exit adc16dv160_exit(void)
{
    /* Unregister SPI driver */
    spi_unregister_driver(&adc16dv160_spi_driver);
}

/* ADC16DV160 driver module information */
MODULE_AUTHOR("Your name");
MODULE_DESCRIPTION("ADC16DV160 driver");
MODULE_LICENSE("GPL");

/* ADC16DV160 driver module initialization */
module_init(adc16dv160_init);

/* ADC16DV160 driver module cleanup */
module_exit(adc16dv160_exit);

以上是一个简单的 ADC16DV160 的 Xilinx FPGA 驱动代码示例，可以根据实际情况进行修改。