USB: usb_wwan/option: generalize option_send_setup for other drivers

Only the option driver implements the send_setup callback; it uses the
SET_CONTROL_LINE_STATE request in CDC ACM to generate DTR/RTS signals
on the port. This is not driver-specific though and is needed by other
drivers, so move the function to the usb_wwan driver (with formatting
tweaks), and replace the callback pointer with a flag that enables the
request.

Suggested-by: Bjørn Mork <bjorn@mork.no>
Suggested-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David Ward <david.ward@ll.mit.edu>
Signed-off-by: Johan Hovold <johan@kernel.org>

3 files changed, 40 insertions, 40 deletions

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 4d16c9744f54..edfaec19e1ae 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -48,7 +48,6 @@ static int  option_probe(struct usb_serial *serial,
                         const struct usb_device_id *id);
 static int option_attach(struct usb_serial *serial);
 static void option_release(struct usb_serial *serial);
-static int option_send_setup(struct usb_serial_port *port);
 static void option_instat_callback(struct urb *urb);
 
 /* Vendor and product IDs */
@@ -1890,7 +1889,7 @@ static int option_attach(struct usb_serial *serial)
 
         if (!blacklist || !test_bit(iface_desc->bInterfaceNumber,
                                                 &blacklist->sendsetup)) {
-                data->send_setup = option_send_setup;
+                data->use_send_setup = 1;
         }
         spin_lock_init(&data->susp_lock);
 
@@ -1961,39 +1960,6 @@ static void option_instat_callback(struct urb *urb)
         }
 }
 
-/** send RTS/DTR state to the port.
- *
- * This is exactly the same as SET_CONTROL_LINE_STATE from the PSTN
- * CDC.
-*/
-static int option_send_setup(struct usb_serial_port *port)
-{
-        struct usb_serial *serial = port->serial;
-        struct usb_wwan_port_private *portdata;
-        int ifNum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
-        int val = 0;
-        int res;
-
-        portdata = usb_get_serial_port_data(port);
-
-        if (portdata->dtr_state)
-                val |= 0x01;
-        if (portdata->rts_state)
-                val |= 0x02;
-
-        res = usb_autopm_get_interface(serial->interface);
-        if (res)
-                return res;
-
-        res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
-                                0x22, 0x21, val, ifNum, NULL,
-                                0, USB_CTRL_SET_TIMEOUT);
-
-        usb_autopm_put_interface(serial->interface);
-
-        return res;
-}
-
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
diff --git a/drivers/usb/serial/usb-wwan.h b/drivers/usb/serial/usb-wwan.h
index f22dff58b587..44b25c08c68a 100644
--- a/drivers/usb/serial/usb-wwan.h
+++ b/drivers/usb/serial/usb-wwan.h
@@ -34,9 +34,9 @@ extern int usb_wwan_resume(struct usb_serial *serial);
 struct usb_wwan_intf_private {
         spinlock_t susp_lock;
         unsigned int suspended:1;
+        unsigned int use_send_setup:1;
         int in_flight;
         unsigned int open_ports;
-        int (*send_setup) (struct usb_serial_port *port);
         void *private;
 };
 
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 825305cb71d9..be9cb61b4d19 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -36,6 +36,40 @@
 #include <linux/serial.h>
 #include "usb-wwan.h"
 
+/*
+ * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
+ * in CDC ACM.
+ */
+static int usb_wwan_send_setup(struct usb_serial_port *port)
+{
+        struct usb_serial *serial = port->serial;
+        struct usb_wwan_port_private *portdata;
+        int val = 0;
+        int ifnum;
+        int res;
+
+        portdata = usb_get_serial_port_data(port);
+
+        if (portdata->dtr_state)
+                val |= 0x01;
+        if (portdata->rts_state)
+                val |= 0x02;
+
+        ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
+
+        res = usb_autopm_get_interface(serial->interface);
+        if (res)
+                return res;
+
+        res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+                                0x22, 0x21, val, ifnum, NULL, 0,
+                                USB_CTRL_SET_TIMEOUT);
+
+        usb_autopm_put_interface(port->serial->interface);
+
+        return res;
+}
+
 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
 {
         struct usb_wwan_port_private *portdata;
@@ -43,7 +77,7 @@ void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
 
         intfdata = usb_get_serial_data(port->serial);
 
-        if (!intfdata->send_setup)
+        if (!intfdata->use_send_setup)
                 return;
 
         portdata = usb_get_serial_port_data(port);
@@ -51,7 +85,7 @@ void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
         portdata->rts_state = on;
         portdata->dtr_state = on;
 
-        intfdata->send_setup(port);
+        usb_wwan_send_setup(port);
 }
 EXPORT_SYMBOL(usb_wwan_dtr_rts);
 
@@ -84,7 +118,7 @@ int usb_wwan_tiocmset(struct tty_struct *tty,
         portdata = usb_get_serial_port_data(port);
         intfdata = usb_get_serial_data(port->serial);
 
-        if (!intfdata->send_setup)
+        if (!intfdata->use_send_setup)
                 return -EINVAL;
 
         /* FIXME: what locks portdata fields ? */
@@ -97,7 +131,7 @@ int usb_wwan_tiocmset(struct tty_struct *tty,
                 portdata->rts_state = 0;
         if (clear & TIOCM_DTR)
                 portdata->dtr_state = 0;
-        return intfdata->send_setup(port);
+        return usb_wwan_send_setup(port);
 }
 EXPORT_SYMBOL(usb_wwan_tiocmset);