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usb-serial: show port number in sysfs

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Some usb-serial devices (e.g. certain Edgeport models) have more than
one serial port on the same USB device/interface.

Currently the only way to distinguish these ports in userspace is by
their minor device number: the driver makes them consecutive and in
stable order.

However, for the purpose of stable naming with udev this is
insufficient: when udev handles the ADD event for one of the ports it
doesn't know what minor number the other one has.

To make stable naming easier, export the port number via sysfs.

Signed-off-by: Roman Kagan <rkagan@sw.ru>
Signed-off-by: Dmitry Guryanov <dimak@dgap.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Roman Kagan 2007-08-24 20:22:52 +04:00 committed by Greg Kroah-Hartman
parent fdf99c9ec1
commit ce0d9325b1
1 changed files with 16 additions and 0 deletions
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16
drivers/usb/serial/bus.c
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@ -36,6 +36,16 @@ static int usb_serial_device_match (struct device *dev, struct device_driver *dr
return 0;
}
static ssize_t show_port_number(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct usb_serial_port *port = to_usb_serial_port(dev);
return sprintf(buf, "%d\n", port->number - port->serial->minor);
}
static DEVICE_ATTR(port_number, S_IRUGO, show_port_number, NULL);
static int usb_serial_device_probe (struct device *dev)
{
struct usb_serial_driver *driver;
@ -62,6 +72,10 @@ static int usb_serial_device_probe (struct device *dev)
goto exit;
}
retval = device_create_file(dev, &dev_attr_port_number);
if (retval)
goto exit;
minor = port->number;
tty_register_device (usb_serial_tty_driver, minor, dev);
dev_info(&port->serial->dev->dev,
@ -84,6 +98,8 @@ static int usb_serial_device_remove (struct device *dev)
return -ENODEV;
}
device_remove_file(&port->dev, &dev_attr_port_number);
driver = port->serial->type;
if (driver->port_remove) {
if (!try_module_get(driver->driver.owner)) {