Function pci_read

components/drivers/pci/procfs.c:64–143

}

static ssize_t pci_read(struct dfs_file *file, void *buf, size_t count, off_t *ppos)
{
    off_t pos = *ppos;
    size_t res = count;
    rt_ubase_t pm_flags;
    struct proc_dentry *dentry = file->vnode->data;
    struct rt_pci_device *pdev = dentry->data;

    pci_pm_runtime_get(pdev, &pm_flags);

    if ((pos & 1) && count)
    {
        rt_uint8_t val;

        rt_pci_read_config_u8(pdev, pos, &val);
        copy_to_user(buf, &val, sizeof(val));

        ++buf;
        ++pos;
        --count;
    }

    if ((pos & 3) && count > 2)
    {
        rt_uint16_t val;

        rt_pci_read_config_u16(pdev, pos, &val);

        val = rt_cpu_to_le16(val);
        copy_to_user(buf, &val, sizeof(val));

        buf += 2;
        pos += 2;
        count -= 2;
    }

    while (count >= 4)
    {
        rt_uint32_t val;

        rt_pci_read_config_u32(pdev, pos, &val);

        val = rt_cpu_to_le32(val);
        copy_to_user(buf, &val, sizeof(val));

        buf += 4;
        pos += 4;
        count -= 4;
    }

    if (count >= 2)
    {
        rt_uint16_t val;

        rt_pci_read_config_u16(pdev, pos, &val);

        val = rt_cpu_to_le16(val);
        copy_to_user(buf, &val, sizeof(val));