Device Driver Tutorial

Defining the Report Driver Property Information Entry Point

The prop_op(9E) entry point is required for every driver. If your driver does not need to customize the behavior of the prop_op(9E) entry point, then your driver can use the ddi_prop_op(9F) function for the prop_op(9E) entry point. Drivers that create and manage their own properties need a custom prop_op(9E) routine. This dummy driver uses a prop_op(9E) routine to call cmn_err(9F) before calling the ddi_prop_op(9F) function.

The prop_op(9E) entry point and the ddi_prop_op(9F) function both require that you include the types.h header file. The prop_op(9E) entry point and the ddi_prop_op(9F) function both take the same seven arguments. These arguments are not discussed here because this dummy driver does not create and manage its own properties. See the prop_op(9E) man page to learn about the prop_op(9E) arguments.

The following code is the dummy_prop_op() routine that you should enter into your dummy.c file. You can copy the name portion of this function definition directly from the declaration you entered in Declaring the Autoconfiguration Entry Points.

static int
dummy_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    int flags, char *name, caddr_t valuep, int *lengthp)
    cmn_err(CE_NOTE, "Inside dummy_prop_op");

First, use cmn_err(9F) to write a message to the system log, as you did in your _init(9E) entry point. Then call the ddi_prop_op(9F) function with exactly the same arguments as the dummy_prop_op() function.