summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/usb/serial/usb_wwan.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/drivers/usb/serial/usb_wwan.c')
-rw-r--r--kernel/drivers/usb/serial/usb_wwan.c44
1 files changed, 39 insertions, 5 deletions
diff --git a/kernel/drivers/usb/serial/usb_wwan.c b/kernel/drivers/usb/serial/usb_wwan.c
index 2f805cb38..be9cb61b4 100644
--- a/kernel/drivers/usb/serial/usb_wwan.c
+++ b/kernel/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);
@@ -282,7 +316,7 @@ static void usb_wwan_indat_callback(struct urb *urb)
/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
- if (err != -EPERM) {
+ if (err != -EPERM && err != -ENODEV) {
dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
__func__, err);
/* busy also in error unless we are killed */