Pci Device Driver ✮

static struct pci_driver my_pci_driver = .name = "my_pci_driver", .id_table = my_ids, .probe = my_probe, .remove = my_remove, ;

// 4. Map BAR0 (control registers) into kernel virtual address space void __iomem *regs = pci_iomap(pdev, 0, 0); pci device driver

pci_release_regions(pdev); pci_disable_device(pdev); static struct pci_driver my_pci_driver =

// 3. Set DMA mask (e.g., 64-bit addressing) dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); .id_table = my_ids

But hardware alone is inert. The true intelligence lies in the —the software layer that translates the operating system's generic requests into specific commands the hardware understands.

pci_enable_device(pdev); pci_request_regions(pdev, "my_pci_driver"); pci_iomap(pdev, 0, 0); return 0;

static int my_probe(struct pci_dev *pdev, const struct pci_device_id *id)