- 论坛徽章:
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- static int __init spidev_init(void)
- {
- int status;
- /* Claim our 256 reserved device numbers. Then register a class
- * that will key udev/mdev to add/remove /dev nodes. Last, register
- * the driver which manages those device numbers.
- */
- BUILD_BUG_ON(N_SPI_MINORS > 256);
- status = register_chrdev(SPIDEV_MAJOR, "spi", &spidev_fops);
- if (status < 0)
- return status;
- spidev_class = class_create(THIS_MODULE, "spidev");
- if (IS_ERR(spidev_class)) {
- unregister_chrdev(SPIDEV_MAJOR, spidev_spi.driver.name);
- return PTR_ERR(spidev_class);
- }
- status = spi_register_driver(&spidev_spi);
- if (status < 0) {
- class_destroy(spidev_class);
- unregister_chrdev(SPIDEV_MAJOR, spidev_spi.driver.name);
- }
- return status;
- }
复制代码 上面是spidev.c中的代码,我想问的是这段代码中,有两个注册函数 register_chrdev和spi_register_driver
,那是不是会创建两个设备节点啊 |
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