1CDEV_DEVICE_ADD(9)               Char devices               CDEV_DEVICE_ADD(9)
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NAME

6       cdev_device_add - add a char device and it's corresponding struct
7       device, linkink
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SYNOPSIS

10       int cdev_device_add(struct cdev * cdev, struct device * dev);
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ARGUMENTS

13       cdev
14           the cdev structure
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16       dev
17           the device structure
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DESCRIPTION

20       cdev_device_add adds the char device represented by cdev to the system,
21       just as cdev_add does. It then adds dev to the system using device_add
22       The dev_t for the char device will be taken from the struct device
23       which needs to be initialized first. This helper function correctly
24       takes a reference to the parent device so the parent will not get
25       released until all references to the cdev are released.
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27       This helper uses dev->devt for the device number. If it is not set it
28       will not add the cdev and it will be equivalent to device_add.
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30       This function should be used whenever the struct cdev and the struct
31       device are members of the same structure whose lifetime is managed by
32       the struct device.
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NOTE

35       Callers must assume that userspace was able to open the cdev and can
36       call cdev fops callbacks at any time, even if this function fails.
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39Kernel Hackers Manual 3.10         June 2019                CDEV_DEVICE_ADD(9)
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