Hello,
I try to communicate with a cp210x-device on my usb bus. I create a sysfs
object with some simple lines of code like the next one ...
static ssize_t cp210x_show_x(struct device *dev, struct device_attribute
*attr, char *buf)
{
struct usb_serial_port *port = to_usb_serial_port(dev);
if(!port) {
printk("no port\n");
goto exit;
}
if(!port->serial) {
printk("no serial\n");
goto exit;
}
struct cp210x_serial_private *spriv = usb_get_serial_data(port->serial);
printk("%s:%s:%d num_ports:0x%08x\n", __FILE__, __func__, __LINE__,
port->serial->num_ports);
exit:
return 0;
}
static DEVICE_ATTR(x, S_IRUGO, cp210x_show_x, NULL);
static int create_sysfs_attrs(struct usb_serial *serial)
{
return device_create_file(&serial->dev->dev, &dev_attr_x);
}
I have the problem that port->serial is everytime NULL.
Some digging in usb-serial.c shows me that the port->serial is set on plugin of
my device through the usb_serial_probe-function.
Is this a bug or should I recive the usb_serial object with other mehods? What
methods should I use?
This Problem occurs on 3.9-rc7 and 3.13-rc3.
Thanks for some hints,
Silvio
--
-- S. Fricke ---------------------------------------- sil...@port1024.net --
Diplom-Informatiker (FH)
Linux-Entwicklung JABBER: sil...@conversation.port1024.net
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