diff options
Diffstat (limited to 'drivers/usb/serial/usb_wwan.c')
| -rw-r--r-- | drivers/usb/serial/usb_wwan.c | 42 |
1 files changed, 38 insertions, 4 deletions
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); |