From: Petr Tesarik <ptesarik@xxxxxxx>
Make it possible to read the cp210x part number from userspace by making
it a sysfs attribute.
Signed-off-by: Petr Tesarik <ptesarik@xxxxxxxx>
---
drivers/usb/serial/cp210x.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index dbfc722..66de350 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -871,11 +871,24 @@ static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
}
+static ssize_t part_number_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_serial *serial = usb_get_intfdata(intf);
+ struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
+
+ return sprintf(buf, "%i\n", spriv->bPartNumber);
+}
+
+static DEVICE_ATTR_RO(part_number);
+
static int cp210x_startup(struct usb_serial *serial)
{
struct usb_host_interface *cur_altsetting;
struct cp210x_serial_private *spriv;
unsigned int partnum;
+ int result;
spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
if (!spriv)
@@ -892,13 +905,19 @@ static int cp210x_startup(struct usb_serial *serial)
&partnum, 1, USB_CTRL_GET_TIMEOUT);
spriv->bPartNumber = partnum & 0xFF;
- return 0;
+ result = device_create_file(&serial->interface->dev,
+ &dev_attr_part_number);
+ if (result)
+ kfree(spriv);
+
+ return result;
}
static void cp210x_release(struct usb_serial *serial)
{
struct cp210x_serial_private *spriv;
+ device_remove_file(&serial->interface->dev, &dev_attr_part_number);
spriv = usb_get_serial_data(serial);
kfree(spriv);
}
--
2.1.4
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