Device driver polling

The device drivers can either poll the device or they can use interrupts. Polling the device usually means reading its status register every so often until the device's status changes to indicate that it has completed the request. As a device driver is part of the kernel it would be disasterous if a driver were to poll as nothing else in the kernel would run until the device had completed the request.  · A device driver that does much polling interferes with I/O operations on other devices and can make the system slow and unresponsive to users. Recently developed devices, which are as technologically advanced as the processors on which Windows is designed to run, seldom require a driver to poll its device, either to ensure that the device is ready to start an I/O operation or that an .  · The driver must check the receive or transmit parameters of the NDIS_POLL_DATA structure to get the maximum number of NBLs it can indicate or complete. For receive indications, the driver should: Fetch up to the maximum number of Rx packets it can indicate.

Answer (1 of 2): Suppose you have a microcontroller board inside an industrial device that measures temperature and relative humidity of a dozen of points in the production plant and controls the air conditioning with an intelligent control algorithm. Polling is the simplest way for an I/O device to communicate with the processor. The process of periodically checking status of the device to see if it is time for the next I/O operation, is called polling. The I/O device simply puts the information in a Status register, and the processor must come and get the information. The driver’s method will be called whenever the user-space program performs a poll or select system call involving a file descriptor associated with the driver. The device method is in charge of these two steps.

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