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Old 11-17-2011, 12:06 AM   #1
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Writting PCI Driver

HI I am new to Kernel programming my task is to write a pci user space and kernel space module that will work same as the lspci command i used pci_read_config_byte() to access the pci configuration space but it didnt seem to work please suggest me a way to approach this Thanks in advance
Old 11-17-2011, 06:11 PM   #2
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static int sis_66_cable_detect(struct ata_port *ap)
        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
        u8 tmp;

        /* Older chips keep cable detect in bits 4/5 of reg 0x48 */
        pci_read_config_byte(pdev, 0x48, &tmp);
        tmp >>= ap->port_no;
        if ((tmp & 0x10) && !sis_short_ata40(pdev))
                return ATA_CBL_PATA40;
        return ATA_CBL_PATA80;
Looks like pci_read_config_byte is used in many kernel drivers. The call works so I guess it is your code which is wrong.


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