Source of mem.c - linux-imx - PHYTEC BitBucket (Stash)

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    *ppos = p;
    return virtr + wrote ? : err;
}
​
static ssize_t read_port(struct file *file, char __user *buf,
             size_t count, loff_t *ppos)
{
    unsigned long i = *ppos;
    char __user *tmp = buf;
​
    if (!access_ok(VERIFY_WRITE, buf, count))
    if (!access_ok(buf, count))
        return -EFAULT;
    while (count-- > 0 && i < 65536) {
        if (__put_user(inb(i), tmp) < 0)
            return -EFAULT;
        i++;
        tmp++;
    }
    *ppos = i;
    return tmp-buf;
}
​
static ssize_t write_port(struct file *file, const char __user *buf,
              size_t count, loff_t *ppos)
{
    unsigned long i = *ppos;
    const char __user *tmp = buf;
​
    if (!access_ok(VERIFY_READ, buf, count))
    if (!access_ok(buf, count))
        return -EFAULT;
    while (count-- > 0 && i < 65536) {
        char c;
​
        if (__get_user(c, tmp)) {
            if (tmp > buf)
                break;
            return -EFAULT;
        }
        outb(c, i);