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标题: 之前实现的一个adc驱动，贴一下 [打印本页]
作者: z3j6w9    时间: 2017-6-16 14:06
标题: 之前实现的一个adc驱动，贴一下
  1. #include <linux/kernel.h>
  2. #include <linux/init.h>
  3. #include <linux/module.h>
  4. #include <linux/delay.h>
  5. #include <linux/gpio.h>
  6. #include <linux/fs.h>
  7. #include <linux/cdev.h>
  8. #include <linux/slab.h>
  9. #include <linux/uaccess.h>
  10. #include <linux/interrupt.h>
  11. #include <asm/irq.h>
  12. #include <linux/iio/consumer.h>

  14. #ifdef CONFIG_OF
  15. #include <linux/of.h>
  16. #include <linux/of_gpio.h>
  17. #include <linux/of_platform.h>
  18. #endif


  21. #define DESC(x) 1

  23. #if DESC("global area")

  25. static int global_major;
  26. static struct class *adc0_class;
  27. static struct device *adc0_device;
  28. static struct device *adc0_dev = NULL;

  30. #endif
  31. static int adc0_probe(struct platform_device *pdev)
  32. {
  33.         /*Get io channel*/
  34.         adc0_dev = &pdev->dev;
  35.         printk("%s \n", __FUNCTION__);
  36.        
  37.         return 0;
  38.        
  39. }

  41. static int adc0_remove(struct platform_device *pdev)
  42. {
  43.         return 0;
  44. }

  46. static const struct of_device_id of_adc0_match[] = {
  47.         { .compatible = "sunrex,adc_test" },
  48.         { /* Sentinel */ }
  49. };

  51. static struct platform_driver adc0_driver = {
  52.         .probe = adc0_probe,
  53.         .remove = adc0_remove,
  54.         .driver = {
  55.                 .owner = THIS_MODULE,
  56.                 .name  = "adc0",
  57. #ifdef CONFIG_OF
  58.                 .of_match_table  = of_adc0_match,
  59. #endif
  60.         },
  61. };

  63. static ssize_t adc0_read(struct file *filep, char __user *usrbuf, size_t size, loff_t *offset)
  64. {
  65.        
  66.         int val,ret;
  67.         struct iio_channel *chan; //定义 IIO 通道结构体

  69.         printk("%s \n", __FUNCTION__);
  70.         chan = iio_channel_get(adc0_dev, NULL); //获取 IIO 通道结构体
  71.         ret = iio_read_channel_raw(chan, &val);

  73.         printk("adc0 value = %u \n", val);
  74.         if (ret < 0)
  75.         {
  76.                 printk("Read channel failed. \n");
  77.                 return EIO;
  78.         }
  79.         copy_to_user(usrbuf, (void *)&val, size);

  81.          return 0;
  82. }
  83. static ssize_t adc0_write(struct file *filep, const char __user *usrbuf, size_t size, loff_t *offset)
  84. {
  85.         return 0;
  86. }

  88. static int adc0_open(struct inode *inode, struct file *filep)
  89. {
  90.         return 0;
  91. }
  92. static int adc0_release(struct inode *inode, struct file *filep)
  93. {

  95.         return 0;
  96. }


  99. static struct file_operations motor_fops = {
  100.         .owner =   THIS_MODULE,
  101.         .read  =   adc0_read,
  102.         .write =   adc0_write,
  103.         .open  =   adc0_open,
  104.         .release = adc0_release,
  105. };

  107. static int __init adc0_init(void)
  108. {
  109.         /*system will auto allocate major*/
  110.         global_major = register_chrdev(0, "adc0", &motor_fops);

  112.         /*create class*/
  113.         adc0_class = class_create(THIS_MODULE, "adc0_drv");

  115.         /*create device for app*/
  116.         adc0_device = device_create(adc0_class, NULL, MKDEV(global_major, 0), NULL, "adc0");
  117.        

  119.         //if (ret < 0)
  120.         //        return ret;
  121.         platform_driver_register(&adc0_driver);
  122.         return 0;
  123. }

  125. static void __exit adc0_exit(void)
  126. {
  127.         platform_driver_unregister(&adc0_driver);
  128.         device_destroy(adc0_class,MKDEV(global_major, 0));
  129.         class_destroy(adc0_class);
  130.         //unregister_chrdev_region(MKDEV(global_major, 0), 1);
  131.         unregister_chrdev(global_major, "adc0");
  132. }

  134. module_init(adc0_init);
  135. module_exit(adc0_exit);
  136. MODULE_LICENSE("GPL");
  137. MODULE_AUTHOR("zhang jiawei");
复制代码
作者: raindy_s    时间: 2017-6-23 11:13
正在看这方面的内容，先收藏！谢谢！
作者: cheng_86    时间: 2017-7-14 10:44
ADC   MARK



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