On Tue, 2014-01-14 at 14:54 +0100, Silvio F. wrote:
> 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);
> }
You are creating a sysfs entry for struct device associated with a
struct usb_serial. Yet you convert this to struct usb_serial_port.
struct usb_serial {
struct usb_device *dev;
struct usb_serial_driver *type;
struct usb_interface *interface;
unsigned char disconnected:1;
unsigned char suspending:1;
unsigned char attached:1;
unsigned char minors_reserved:1;
unsigned char num_ports;
unsigned char num_port_pointers;
char num_interrupt_in;
char num_interrupt_out;
char num_bulk_in;
char num_bulk_out;
struct usb_serial_port *port[MAX_NUM_PORTS];
struct kref kref;
struct mutex disc_mutex;
void *private;
};
This structure points to multiple instances of struct usb_serial_port.
This cannot work.
Regards
Oliver
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