On 15/01/16 21:59, Konstantin Shkolnyy wrote:
From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-
owner@xxxxxxxxxxxxxxx] On Behalf Of Martyn Welch
Sent: Friday, January 15, 2016 04:51
To: Johan Hovold; Linus Walleij; Alexandre Courbot
Cc: Greg Kroah-Hartman; linux-usb@xxxxxxxxxxxxxxx; linux-
gpio@xxxxxxxxxxxxxxx; Martyn Welch
Subject: [PATCH v3] USB: serial: cp210x: Adding GPIO support for CP2105
...
+static int cp210x_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+ struct cp210x_port_private *port_priv =
+ container_of(gc, struct cp210x_port_private, gc);
+ struct usb_serial *serial = port_priv->serial;
+ u8 *buf;
+ int result;
+
+ buf = kzalloc(sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,
0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_INTERFACE_TO_HOST,
CP210X_READ_LATCH,
+ port_priv->bInterfaceNumber, buf, 1,
+ USB_CTRL_GET_TIMEOUT);
+ if (result != 1) {
+ dev_err(&serial->port[port_priv->bInterfaceNumber]->dev,
+ "failed to get gpio state: %d\n", result);
+ result = 0;
+ goto err;
leaking buf
Oops. Thanks.
+ }
+
+ result = (*buf >> gpio) & 0x1;
+
+ kfree(buf);
+err:
+ return result;
+}
...
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